Journal of Oral Rehabilitation via MedWorm.com

Pathophysiology of TMD pain – basic mechanisms and their implications for pharmacotherapy

Journal of Oral Rehabilitation — Wed, 10 Mar 2010 00:00:00 +0100

This article discusses the pathophysiology of temporomandibular disorders (TMD)-related pain and its treatment with analgesic drugs. Temporomandibular disorders are comprised of a group of conditions that result in temporomandibular joint pain (arthralgia, arthritis) and/or masticatory muscle pain (myofascial TMD). In at least some patients with TMD, a peripheral mechanism contributes to this pain. However, there is often a poor correlation between the severity of TMD-related pain complaints and evidence of definitive tissue pathology. This has led to the concept that pain in some patients with TMD may result from altered central nervous system pain processing and further that this altered pain processing may be attributable to specific genes that are heritable. Psychosocial stressors are ...

The mandible advancement may alter the coordination between breathing and the non-nutritive swallowing reflex

Journal of Oral Rehabilitation — Wed, 10 Mar 2010 00:00:00 +0100

We examined the effect of mandible advancement associated with mouth opening on the coordination between nasal breathing and non-nutritive swallowing induced by continuous infusion of distilled water into the pharyngeal cavity. The combination of mandible advancement and mouth opening increased the duration of swallowing apnoea and submental electromyographic burst duration. When the mandible was advanced with the mouth open, the duration of swallowing apnoea increased significantly compared with the centric position (0·79 ± 0·23 vs. 0·64 ± 0·12 s, P < 0·05, n = 12), and the duration of submental electromyographic activity increased significantly (2·11 ± 0·63 vs. 1·46 ± 0·25 s, P < 0·05, n = 12). Mandible advancement with mouth opening altered the respiratory phase resetting ...

A clinical follow-up study of the periodontal conditions of RPD abutment and non-abutment teeth

Journal of Oral Rehabilitation — Wed, 10 Mar 2010 00:00:00 +0100

This study indicated that direct and indirect retainer elements tend to undergo more damaging periodontal effects associated with RPD wearing when compared with non-abutment elements. Plaque index values were significantly higher after 1 year of denture use. (Source: Journal of Oral Rehabilitation)

Activity patterns of the suprahyoid muscles during swallowing of different fluid volumes

Journal of Oral Rehabilitation — Wed, 10 Mar 2010 00:00:00 +0100

Summary Influences of bolus volumes on activity patterns of the suprahyoid muscles during swallowing were examined using the TP technique (which quantitatively evaluates muscle activity patterns and indicates a negatively skewed pattern at lower TP values) in healthy young adults (eight men and four women). One of six volumes of tea ranging from 10 to 32 mL was delivered randomly to each subject while recording an electromyogram of the suprahyoid muscles and a laryngeal mechanogram with a piezoelectric sensor. Each subject was asked to swallow the full volume of liquid in a gulp if possible. TP values were calculated as deciles from T0 to T100 during intervals that were defined by the trajectory of the laryngeal mechanogram recorded during swallowing. Seven significant differences were det...

A study of labial groove-textures of upper central incisors by Shadow Moiré technology

Journal of Oral Rehabilitation — Wed, 10 Mar 2010 00:00:00 +0100

Summary The labial groove-textures of upper central incisors were defined and explored to imitate the elaborate groove-textures for aesthetic restorations. In the current study, 158 upper central incisors were selected from 79 volunteers aged from 19 to 24 and recruited from Sichuan University in Chengdu of China. The length, width, depth, combination and distribution of the horizontal and vertical grooves on the labial surface were investigated by an optical measurement method, based on the Shadow Moiré technology and Temporal Fourier analysis. Vertical grooves were confirmed to be present in 94% of the samples and horizontal grooves in 77%. Perfect symmetry was shown in the vertical grooves of the same tooth, as well as in the homonymous teeth. The majority of horizontal grooves were di...

Awareness of tooth grinding and clenching from adolescence to young adulthood: a nine-year follow-up

Journal of Oral Rehabilitation — Wed, 03 Mar 2010 00:00:00 +0100

Summary How bruxism develops from adolescence to early adulthood remains unclear. A previous database was revisited to evaluate the natural course of self-reported tooth grinding and clenching among young Finns aged 14[ndash]23 using four assessments. Overall, the self-reported frequencies of both grinding and clenching increased during the examination period: from 13·7% to 21·7% and from 9·2% to 14·8%, respectively. There were significant increases (without a statistically significant difference between genders) in both grinding (P = 0·002) and clenching (P = 0·015) between 15 and 23 years. A significant rise in grinding between 18 and 23 years was also found (P = 0·011). It is concluded that self-reported bruxism increases from adolescence to young adulthood. Moreover, there are l...

Impact of implant number, distribution and prosthesis material on loading on implants supporting fixed prostheses

Journal of Oral Rehabilitation — Tue, 02 Mar 2010 00:00:00 +0100

Summary The purpose of this study is to evaluate axial forces and bending moments (BMs) on implants supporting a complete arch fixed implant supported prosthesis with respect to number and distribution of the implants and type of prosthesis material. Seven oral Brånemark implants with a diameter of 3.75 mm and a length of 13 and 7 mm (short distal implant) were placed in an edentulous composite mandible used as the experimental model. One all-acrylic, one fibre-reinforced acrylic, and one milled titanium framework prosthesis were made. A 50 N vertical load was applied on the extension 10 mm distal from the most posterior implant. Axial forces and BMs were measured by calculating signals from three strain gauges attached to each of the abutments. The load was measured using three different...

Occlusion and brain function: mastication as a prevention of cognitive dysfunction

Journal of Oral Rehabilitation — Tue, 02 Mar 2010 00:00:00 +0100

Summary Research in animals and humans has shown that mastication maintains cognitive function in the hippocampus, a brain area important for learning and memory. Reduced mastication, an epidemiological risk factor for the development of dementia in humans, attenuates spatial memory and causes hippocampal neurons to deteriorate morphologically and functionally, especially in aged animals. Active mastication rescues the stress-attenuated hippocampal memory process in animals and attenuates the perception of stress in humans by suppressing endocrinological and autonomic stress responses. Active mastication further improves the performance of sustained cognitive tasks by increasing the activation of the hippocampus and the prefrontal cortex, the brain regions that are essential for cognitive ...

Eighteen-month clinical evaluation of microhybrid, packable and nanofilled resin composites in Class I restorations

Journal of Oral Rehabilitation — Fri, 26 Feb 2010 00:00:00 +0100

Summary The aim of this article was to report the results of an 18-month longitudinal randomized clinical trial that evaluated the clinical performance of microhybrid, packable and nanofilled resin composite restorations placed in Class I cavities of molar teeth. Three Class I resin composite restorations were placed in each of 35 patients. Each patient received one microhybrid ('Point 4'; Kerr, Orange, CA, USA), one packable ('Packable Premise'; Kerr, Orange, CA, USA) and one nanofilled ('Nanofilled Premise'; Kerr, Orange, CA, USA) resin composite restoration. Clinical evaluation was performed at baseline (2 weeks after placement), and after 6, 12 and 18 months after placement using modified Ryge criteria. No patients were lost from the study. At the final appointment (after 18 months), 9...

The orthodontic–periodontic interrelationship in integrated treatment challenges: a systematic review

Journal of Oral Rehabilitation — Thu, 25 Feb 2010 00:00:00 +0100

Summary Orthodontic treatment aims at providing an acceptable functional and aesthetic occlusion with appropriate tooth movements. These movements are strongly related to interactions of teeth with their supportive periodontal tissues. In recent years, because of the increased number of adult patients seeking orthodontic treatment, orthodontists frequently face patients with periodontal problems. Aesthetic considerations, like uneven gingival margins or functional problems resulting from inflammatory periodontal diseases should be considered in orthodontic treatment planning. Furthermore, in cases with severe periodontitis, orthodontics may improve the possibilities of saving and restoring a deteriorated dentition. In modern clinical practice, the contribution of the orthodontist, the peri...

Randomized controlled trial to investigate how acrylic-based resilient liner affects on masticatory ability of complete denture wearers

Journal of Oral Rehabilitation — Tue, 23 Feb 2010 00:00:00 +0100

Summary The aim of this study was to determine the effects of an acrylic-based resilient liner (ARL) on masticatory ability by verifying the null hypothesis that masticatory performance and mandibular movements do not differ between people who wear mandibular complete dentures with ARL and those who wear complete dentures with conventional acrylic resin (CAR). From April 2004 to July 2006, we conducted a randomized controlled trial study at two centres. After written informed consent was obtained from 74 edentulous patients, they were randomly allocated to either the ARL group or CAR group. Masticatory performance and mandibular movement at the lower incisal point during chewing were measured as the outcomes. We did not observe significant differences in both outcomes between the groups. T...

Does the presence of antagonist remaining teeth affect implant overdenture success? A systematic review

Journal of Oral Rehabilitation — Mon, 22 Feb 2010 00:00:00 +0100

Summary Many patients who need implant overdentures are not completely edentulous; they still have antagonist natural teeth or implant fixed prostheses. In such cases, however, little is known about whether existing natural teeth affect the success of implant overdentures positively or act as a complicating factor. This systematic review attempts to clarify the correlation between existing remaining teeth and the survival/success rate of maxillary and mandibular implant overdentures. An assessment of available relevant articles published in English from 1990 to 2009 was performed using an online database and a manual search in libraries. Although the opposing natural dentition was not sufficiently described in the literature, 10 articles about the mandible and 10 articles about the maxilla...

Expectations and final evaluation of complete dentures by patients, dentist and dental technician

Journal of Oral Rehabilitation — Mon, 22 Feb 2010 00:00:00 +0100

This study compared scores given by a dentist, a dental technician and patients for their expectations before and their final evaluation after complete dentures treatment. Twenty completely edentulous patients, a prosthodontist and a dental technician provided scores for the expected aesthetic and functional results of their dentures based on a visual analogue scale at baseline. Post-treatment completion ratings were given after adjustments, by dentist and patients. The dental technician provided post-treatment completion ratings after completing the dentures. The patients had higher expectations than the dental technician and the dentist perceived for both aesthetic and function (P < 0·001). The patients also presented higher post-treatment completion ratings than the dental professional...

Investigating filler morphology and mechanical properties of new low-shrinkage resin composite types

Journal of Oral Rehabilitation — Sat, 20 Feb 2010 00:00:00 +0100

Summary Three types of low-shrinkage composites are today commercially available: Ormocers, cationic ring-opening curing systems and highly filled methacrylate-based materials, which cure via free-radical polymerization mechanisms. The aim of this study was to characterize the inorganic fraction of materials belonging to each type and to compare their mechanical properties. Two Ormocers (Admira and an experimental Ormocer V35694), one ring-opening composite (Filtek Silorane) and five methacrylate-based composites [Filtek Supreme XT, Tetric EvoCeram, Grandio, Synergy D6 (Coltène-Whaledent, Langenau, Germany) and an experimental material, V34930] were tested. Inorganic fillers were quantified by thermogravimetric analysis and morphologically characterized by scanning electron microscopy. Dy...

Influence of neck rotation and neck lateroflexion on mandibular equilibrium

Journal of Oral Rehabilitation — Thu, 18 Feb 2010 00:00:00 +0100

Summary Neuromuscular interaction between neck and jaw muscles has been reported in several studies. However, the influence of experimentally modified posture of the neck on jaw muscle activity during isometric biting was not investigated so far. The aim of the present study was to test by the aid of simultaneous electromyographic and intraoral bite force measurements whether neck rotation and lateroflexion, in contrast to a straightforward neck position, change the isometric cocontraction patterns of masticatory muscles under identical submaximum bite forces of 50[ndash]200 N. Electric muscle activity of all masticatory muscles and changes of the reduction point (RP) of the resultant bite force vectors were examined. An anteroposterior displacement of the RPs could be observed for the rot...

Accuracy assessment of three-dimensional surface reconstructions of teeth from Cone Beam Computed Tomography scans

Journal of Oral Rehabilitation — Thu, 18 Feb 2010 00:00:00 +0100

Summary The use of three-dimensional (3D) models of the dentition obtained from cone beam computed tomography (CBCT) is becoming increasingly more popular in dentistry. A recent trend is to replace the traditional dental casts with digital CBCT models for diagnosis, treatment planning and simulation. The accuracy of these models was previously assessed through comparing linear physical and radiographical measurements. However, this assessment technique is both observer and landmark dependent. The accuracy of 3D CBCT teeth reconstructions is yet to be reliably measured. To assess the accuracy of 3D CBCT reconstructions of the teeth using a semi-automated and observer-independent method and to assess the influence of field of view (FoV) selection on reconstruction accuracy. Fully dentate upp...

Evaluation of minimum interdental threshold ability in dentate female temporomandibular disorder patients

Journal of Oral Rehabilitation — Thu, 18 Feb 2010 00:00:00 +0100

Summary Minimum interdental threshold is the smallest thickness that can be detected between teeth during an occlusion and has an influence on the occlusal force and on the control of mandibular movements. The aim of this study was to assess the possible association of the signs and symptoms of temporomandibular disorders (TMD) with the ability to detect a minimum interdental threshold. Two hundred women were equally divided into four groups: asymptomatic (control), subjects with masticatory muscle pain, with articular [temporomandibular joint (TMJ)] pain and mixed (muscular and articular pain). Evaluation of the ability to detect a minimum interdental threshold was performed using aluminium foils with 0·010, 0·024, 0·030, 0·050, 0·080 and 0·094 mm of thickness in the premolar region...

Ageing and surface EMG activity patterns of masticatory muscles

Journal of Oral Rehabilitation — Fri, 12 Feb 2010 00:00:00 +0100

Summary The purpose of this study was to evaluate the influence of age on the electromyographic activity of masticatory muscles. All volunteers were Brazilian, fully dentate (except for Group I [ndash] mixed dentition), Caucasian, aged 7[ndash]80, and divided into five groups: I (7[ndash]12 years), II (13[ndash]20 years), III (21[ndash]40 years), IV (41[ndash]60 years) and V (61[ndash]80 years). Except for Group V, which comprised nine women and eight men, all groups were equally divided with respect to gender (20 M/20 F). Surface electromyographic records of masticatory muscles were obtained at rest and during maximal voluntary contraction, right and left laterality, maximal jaw protrusion and maximal clenching in the intercuspal position. Statistically significant differences (P < 0·05)...

Disability assessment in temporomandibular disorders and masticatory system rehabilitation*

Journal of Oral Rehabilitation — Thu, 11 Feb 2010 00:00:00 +0100

This article reviews the overall model of disablement, the necessary properties of measures to assess disablement, the present state of knowledge about these concepts, and what measures should be considered as part of routine assessment. (Source: Journal of Oral Rehabilitation)

Modified section method for laser-welding of ill-fitting cp Ti and Ni–Cr alloy one-piece cast implant-supported frameworks

Journal of Oral Rehabilitation — Tue, 09 Feb 2010 00:00:00 +0100

This study aimed to verify the effect of modified section method and laser-welding on the accuracy of fit of ill-fitting commercially pure titanium (cp Ti) and Ni[ndash]Cr alloy one-piece cast frameworks. Two sets of similar implant-supported frameworks were constructed. Both groups of six 3-unit implant-supported fixed partial dentures were cast as one-piece [I: Ni[ndash]Cr (control) and II: cp Ti] and evaluated for passive fitting in an optical microscope with both screws tightened and with only one screw tightened. All frameworks were then sectioned in the diagonal axis at the pontic region (III: Ni[ndash]Cr and IV: cp Ti). Sectioned frameworks were positioned in the matrix (10-Ncm torque) and laser-welded. Passive fitting was evaluated for the second time. Data were submitted to anova ...

Development of a ceramic primer with higher bond durability for resin cement

Journal of Oral Rehabilitation — Mon, 01 Feb 2010 00:00:00 +0100

Summary To increase the bond durability of resin to the CAD/CAM ceramic surface, two types of two-bottle type ceramic primers, consisting of Primer A1 or A2 and Primer B, were designed. Primer A1 was prepared by dissolving 25, 50, or 100 mg of [gamma]-methacryloxypropyltrimethoxysilane in 1 mL of ethanol. Primer A2 was prepared by dissolving 50 mg of mixed silanes, consisting of 1,2-bis(trimethoxysilyl)ethane to [gamma]-methacryloxypropyltrimethoxysilane, in 1 mL of ethanol. Mole fractions of 1,2-bis(trimethoxysilyl)ethane to [gamma]-methacryloxypropyltrimethoxysilane were 0, 10, 20, 30, 40 and 50 mol%. Primer B was prepared after dissolving 0·01, 0·05 or 0·1 mol L[minus]1 hydrochloric acid in ethanol by 50 vol%. Ceramic surface was silanated with a mixture of Primers A1 and B or Primer...

Variations in bone density at dental implant sites in different regions of the jawbone

Journal of Oral Rehabilitation — Tue, 26 Jan 2010 00:00:00 +0100

Summary The survival rate of dental implants is markedly influenced by the quality of the bone into which they are placed. The purpose of this study was to determine the trabecular bone density at potential dental implant sites in different regions of the Chinese jawbone using computed tomography (CT) images. One hundred and fifty-four potential implant sites (15 in the anterior mandible, 47 in the anterior maxilla, 55 in the posterior mandible, and 37 in the posterior maxilla) were selected from the jawbones of 62 humans. The data were subjected to statistical analysis to determine any correlation between bone density (in Hounsfield units, HU) and jawbone region using the Kruskal[ndash]Wallis test. The bone densities in the four regions decreased in the following order: anterior mandible ...

The assessment of the short- and long-term changes in the condylar position following sagittal split ramus osteotomy (SSRO) with rigid fixation

Journal of Oral Rehabilitation — Mon, 25 Jan 2010 00:00:00 +0100

Summary The purpose of this study was to compare the short- and long-term changes in condylar position related to the glenoid fossa, and skeletal and occlusal stability after orthognathic surgery. All of the study patients were assessed by cone-beam computed tomography images for condylar rotational changes and anteroposterior position in the pre-surgery, post-surgery and post-retention period. The condylar positions were evaluated on three planes: axial, coronal and sagittal. In the skeletal and occlusal measurements, there was no significant difference between the post-surgery group and the post-retention group. After sagittal split ramus osteotomy (SSRO), the condyle on the axial plane rotated inward (P < 0·05) and maintained during the post-retention period. In the anteroposterior con...

Quantitative sensory tests before and 1½ years after orthognathic surgery: a cross-sectional study

Journal of Oral Rehabilitation — Mon, 25 Jan 2010 00:00:00 +0100

In conclusion; 1½ years after BOS, a large proportion of patients reported somatosensory disturbances and was hypersensitive to mechanical stimuli when compared with pre-op patients and healthy controls. Pre-op patients showed minor somatosensory changes. In addition to patients serving as their own control in prospective studies, a healthy control group and extratrigeminal control sites should be included in future studies. (Source: Journal of Oral Rehabilitation)

Fracture behaviour of zirconia FPDs substructures

Journal of Oral Rehabilitation — Mon, 18 Jan 2010 00:00:00 +0100

Summary The purpose of this study was to evaluate the occurrence of superficial flaws after machining and to identify fracture initiation and propagation in three-unit heat-treated machined fixed partial dentures (FPDs) substructures made of hot isostatic pressed (HIPed) yttria-stabilized tetragonal zirconia polycrystal (Y-TZP) after loaded to fracture. Four three-unit HIPed Y-TZP-based FPDs substructures were examined. To evaluate the occurrence of superficial flaws after machining, the surfaces were studied utilizing a fluorescent penetrant method. After static loading to fracture, characteristic fracture features on both mating halves of the fractured specimens were studied using a stereomicroscope and a scanning electron microscope. Grinding grooves were clearly visible on the surfaces...

Automatic, computer-based speech assessment on edentulous patients with and without complete dentures – preliminary results

Journal of Oral Rehabilitation — Sun, 17 Jan 2010 00:00:00 +0100

Summary Dental rehabilitation of edentulous patients with complete dentures includes not only aesthetics and mastication of food, but also speech quality. It was the aim of this study to introduce and validate a computer-based speech recognition system (ASR) for automatic speech assessment in edentulous patients after dental rehabilitation with complete dentures. To examine the impact of dentures on speech production, the speech outcome of edentulous patients with and without complete dentures was compared. Twenty-eight patients reading a standardized text were recorded twice [ndash] with and without their complete dentures in situ. A control group of 40 healthy subjects with natural dentition was recorded under the same conditions. Speech quality was evaluated by means of a polyphone-base...

Ceramic (Feldspathic & IPS Empress II) versus laboratory composite (Gradia) veneers; A Comparison between their shear bond strength to enamel; an invitro study

Journal of Oral Rehabilitation — Sun, 17 Jan 2010 00:00:00 +0100

Summary Patient demand for aesthetic dentistry is steadily growing. Laminates and free metal restorations have evolved in an attempt to overcome the invasiveness nature of full veneer restorations. Although many different materials have been used for making these restorations, there is no single material that fits best for all purposes. Two groups of ceramic material (Feldspathic and IPS Empress II) and one group of laboratory composite (Gradia) discs (10 discs in each group; 4 mm in diameter and 2 mm in thickness) were prepared according to the manufacturer's instruction. The surface of ceramic discs were etched and silanized. In Gradia group, liquid primer was applied on composite surfaces. Thirty freshly extracted sound human molars and premolars were randomly divided into three groups....

Subjective food intake ability in relation to the Mixing Ability Index in Korean adults

Journal of Oral Rehabilitation — Sun, 17 Jan 2010 00:00:00 +0100

In conclusion, there was a moderate correlation between the subjective FIA and objective MAI in Korean adults. (Source: Journal of Oral Rehabilitation)

Quality of communication and master impressions for the fabrication of cobalt chromium removable partial dentures in general dental practice in England, Ireland and Wales in 2009

Journal of Oral Rehabilitation — Sun, 17 Jan 2010 00:00:00 +0100

Summary The aim of this study was to investigate the quality of communication and master impressions for the fabrication of cobalt chromium removable partial dentures (RPDs) in general dental practice in England, Ireland and Wales in 2009. Two hundred and ten questionnaires were distributed to 21 laboratories throughout England, Ireland and Wales. Information was collected regarding the quality of written communication and selection of master impression techniques for cobalt chromium partial dentures in general dental practice. One hundred and forty-four questionnaires were returned (response rate = 68%). Alginate was the most popular impression material being used in 58% of cases (n = 84), while plastic stock trays were the most popular impression tray, being used in 31% of cases (n = 44)...

Anatomical location of various condylar points for jaw movement analysis in Japanese women

Journal of Oral Rehabilitation — Thu, 14 Jan 2010 00:00:00 +0100

Summary The aim of this study was to determine anatomical locations of the hinge axis point, kinematic axis point and reference point for the palpated lateral condylar pole on lateral cephalograms. Subjects comprised 18 Japanese women selected according to following criteria: normal occlusion; and absence of signs and symptoms of stomatognathic function. Jaw movement and the condylar reference points noted earlier were recorded three-dimensionally with six degrees of freedom, and kinematic axis point and hinge axis point were determined using an optoelectronic jaw-tracking system. Lateral cephalograms were used to determine anatomical locations of the three points in the condyle. Mean location of hinge axis point was 12·9 mm anterior of the porion and 5·3 mm inferior to the Frankfort hor...

Change of HA molecular size and boundary lubrication in synovial fluid of patients with temporomandibular disorders

Journal of Oral Rehabilitation — Wed, 13 Jan 2010 00:00:00 +0100

Summary The collapse of lubrication function caused by changes of synovial fluid (SF) is regarded as the main aetiology of temporomandibular disorders (TMD). Hyaluronan (HA) is one of the principal components of SF. Both physicochemical properties and cell biological functions of HA mainly depend on its molecular size. The present study was designed to analyse the HA molecular size and boundary-lubricating ability of SF in the patients with TMD and compare them with that from normal controls. Temporomandibular disorders patients were divided into three subgroups: displaced disc with reduction (DDR), disc without reduction (DDNR) and disc perforation (DP). After obtaining SF samples, we analysed the molecular size of HA by high-performance liquid chromatography, and boundary-lubricating abi...

Influence of the veneering process on the marginal fit of zirconia fixed dental prostheses

Journal of Oral Rehabilitation — Tue, 05 Jan 2010 00:00:00 +0100

Summary Distortions in the marginal region during manufacture are detrimental to the long-term success of fixed dental prostheses (FDPs). The aim of the present in vitro study was to evaluate changes in marginal fit because of the veneering process of four-unit FDPs made from different zirconia materials. Two groups of FDPs with 10 specimens each were machined from white body zirconia blanks (VITA In-Ceram YZ Cubes, KaVo Everest ZS-Blanks) by means of computer-aided design/computer-aided manufacturing systems and subsequently sintered to their final density. The marginal and internal gaps of the frameworks were determined using a replica technique. Afterwards, frameworks were veneered with the recommended ceramics (VITA VM9, GC Initial Zr), and fitting accuracy was evaluated again. Statist...

Does long-term use of unstable dentures weaken jaw muscles?

Journal of Oral Rehabilitation — Thu, 31 Dec 2009 00:00:00 +0100

This study compared maximum bite forces, electromyographic (EMG) activity and estimated jaw muscle strength among three groups: (i) 17 edentulous subjects using newly acquired implant-retained overdentures (seven men, 10 women; mean age 60·3 ± 13·0 years); (ii) 10 age-matched, fully dentate subjects (five men, five women; mean age 57·9 ± 11·0 years); and (iii) 39 young, fully dentate subjects (19 men, 20 women; mean age 24·4 ± 3·5 years). Electromyographic activity was recorded from subjects' bilateral superficial masseter and anterior temporalis muscles while they generated maximum voluntary bite forces at the right central incisor, right first premolar and right first molar positions. Jaw muscle strength was estimated as the ratio of average EMG activity for all four muscles to ...

Exploratory factor analysis of the Brazilian OHIP for edentulous subjects

Journal of Oral Rehabilitation — Wed, 30 Dec 2009 00:00:00 +0100

Summary The use of seven domains for the Oral Health Impact Profile (OHIP)-EDENT was not supported for its Brazilian version, making data interpretation in clinical settings difficult. Thus, the aim of this study was to assess patients' responses for the translated OHIP-EDENT in a group of edentulous subjects and to develop factor scales for application in future studies. Data from 103 conventional and implant-retained complete denture wearers (36 men, mean age of 69·1 ± 10·3 years) were assessed using the Brazilian version of the OHIP-EDENT. Oral health-related quality of life domains were identified by factor analysis using principal component analysis as the extraction method, followed by varimax rotation. Factor analysis identified four factors that accounted for 63% of the 19 items...

Oral environmental factors affecting number of microbes in saliva of complete denture wearers

Journal of Oral Rehabilitation — Tue, 29 Dec 2009 00:00:00 +0100

Summary The purpose of this study was to clarify which oral environmental factors affected number of microbes in saliva in an edentulous environment. We enrolled 68 edentulous subjects in the study. Numbers of total anaerobic bacteria and Candida species in saliva were determined. Age, sex, un-stimulated salivary flow rate, pH and viscosity of saliva, histatin level in saliva, tongue coating status, tongue pressure, denture plaque status, material of denture base, duration of edentulism, frequency of self oral health care and number of cigarettes per day were also investigated as oral environmental factors. Correlation between number of total anaerobic bacteria or Candida species and each oral environmental factor was determined with the Spearman rank correlation coefficient. Stepwise logi...

Mandibular Kennedy Class I implant-tooth-borne removable partial denture: a systematic review

Journal of Oral Rehabilitation — Tue, 29 Dec 2009 00:00:00 +0100

Summary The purpose of this systematic review is to evaluate the use of implant-tooth-borne removable partial dentures in prosthetic rehabilitation of Kennedy Class I partially edentulous arches. A comprehensive search was performed in MEDLINE, EMBASE, Cochrane Oral Health Group's Trials Register, Cochrane Central Register of Controlled Trials, UK National Research Register, Australian New Zealand Clinical Trials Registry (ANZCTR), conference proceedings and abstracts up to 25 August 2009. Searching the reference list of the selected articles and hand searching of several journals were also performed. A total of nine studies were included. Of these, two were randomized, three were retrospective and four were case reports. All but two had a low reporting quality (level IV on a four-level hi...

Effect of pre-heating on the viscosity and microhardness of a resin composite

Journal of Oral Rehabilitation — Tue, 29 Dec 2009 00:00:00 +0100

Summary The effect of pre-heating resin composite on pre-cured viscosity and post-cured surface hardness was evaluated. Groups of uncured specimens were heated to 60 °C and compared with control groups (24 °C) with respect to viscosity and surface hardness. Mean (SD) viscosities of the pre-heated specimens (n = 15) were in the range of 285 (13)[ndash]377 (11) (Pa) compared with 642 (35)[ndash]800 (23) (Pa) at ambient temperature. There was a statistically significant difference between the two groups (P < 0·001). Mean (SD) Vickers microhardness (VHN) of the pre-heated group (n = 15) was 68·6 (2·3) for the top surface and 68·7 (1·8) for the bottom surface measured at 24 h post curing (specimen thickness = 1·5 mm). The corresponding values for the room temperature group were 60·6 (1...

Which device is more accurate to determine the stability/mobility of dental implants? A human cadaver study

Journal of Oral Rehabilitation — Fri, 11 Dec 2009 00:00:00 +0100

Summary Non-invasive devices including resonance frequency (RF) analysis and mobility measuring (MM) damping capacity assessment are used to measure implant stability/mobility. The aims of the study were to compare the primary stability of implant inserted into extraction sockets by using RF with cable, RF wireless and new wireless MM device, to clarify the relation between these devices and to understand the correlations between peri-implant bone levels and implant stability. A total of 30 screw-type implants (3·75 × 11 and 4·2 × 11 mm) were inserted into extraction sockets of eight mandibular pre-molar regions of human cadavers. The primary stability of implants was measured by three devices after insertion. Peri-implant vertical defects were created in millimetre increments ranging ...

The future of complete dentures in oral rehabilitation. A critical review

Journal of Oral Rehabilitation — Thu, 10 Dec 2009 00:00:00 +0100

Summary Based on available investigations and current trends in oral rehabilitation published in the dental literature, an attempt is made to describe the possible future role of complete dentures. For edentulous patients, complete dentures have for long been the only prosthodontic treatment option. Whereas a large number of edentulous patients report satisfaction with denture usage, a smaller number are unable to adapt; for such patients, sophistication of clinical and technical processes or quality of denture-supporting tissues, appear to have little influence on patient-perceived outcomes. Since the 1980s, osseointegrated dental implants have dramatically improved the therapeutic possibilities, especially so for maladaptive patients. Those able to access such treatment can expect signif...

Masticatory jaw movement optimization after introduction of occlusal interference

Journal of Oral Rehabilitation — Wed, 09 Dec 2009 00:00:00 +0100

Summary How 'control' characteristics of masticatory jaw movement, such as skilfulness of the movement, change after alteration in occlusion remains uncertain. For each of 10 healthy adults with good occlusion, an occlusal interference with artificial 'tooth-cusp' was introduced to the crown of the upper molar tooth on the non-working side of unilateral chewing. Mandibular incisor-point movements were then recorded by a 3D tracking device. The introduction of the occlusal interference induced a remarkable increase in the normalized jerk-cost (NJC), prolonged duration of the decelerative phase and lowered peak velocity for jaw closing movement during chewing. Overall, the NJC and velocity profile showed significant recoveries during the course of about 90 repetitive chewing cycles performed...

Indications for jaw gape-related control of relative muscle activation in sequent chewing strokes

Journal of Oral Rehabilitation — Tue, 08 Dec 2009 00:00:00 +0100

Summary Jaw muscle activity ratios in unilateral isometric biting differ from ratios of unilateral chewing but approach the latter if the jaw gape in biting is made as small as the minimum interocclusal distance (MID) of chewing. Especially, the masseter working/balancing side ratio (W/B-ratio) becomes as asymmetric as in chewing, because of reduction in balancing side (BS) masseter activity. This behaviour of ratios might reflect a 'chewing-specific' motor strategy induced when isometric biting is performed with a 'chewing-like' gape. If this hypothesis applies, activity ratios should be associated with MIDs of sequent chewing strokes in a similar manner as with incremented jaw gapes in isometric biting. To test this prediction, bilateral surface electromyograms of masseter and anterior t...

Comparing masticatory performance and mixing ability

Journal of Oral Rehabilitation — Mon, 07 Dec 2009 00:00:00 +0100

Summary Masticatory performance has often been measured by determining an individual's capacity to comminute a test food. Another method to determine masticatory performance, which is now widely used, evaluates the ability to mix and knead a food bolus. Two-coloured chewing gum and paraffin wax have been used as test foods for the quantification of the mixing ability. The aim of our study was to compare the results obtained with the comminution of an artificial test food and the results obtained from mixing of a two-coloured chewing gum. The degree of mixing of the colours of the chewing gum was quantified with an optical method. Twenty young subjects with a natural dentition (average age 24 years) and twenty elderly subjects, mostly with complete dentures (average age 72 years), participa...

Fracture resistance of roots prosthetically restored with intra-radicular posts of different lengths

Journal of Oral Rehabilitation — Wed, 02 Dec 2009 00:00:00 +0100

Summary The purpose of this study was to assess the fracture resistance of roots that were prosthetically restored with intra-radicular posts of different lengths. Forty-five bovine incisors were sectioned 17 mm from their apices, endodontically treated and randomly divided into three experimental groups: GI, fibreglass posts luted at a depth of 12 mm; GII, 8 mm and GIII, 4 mm. All posts were luted with dual resin cement. Resin composite cores were prepared with standardized measurements, and all teeth were restored with metal crowns. The samples were submitted to the fracture resistance test in a universal testing machine, at an angle of 135° and speed of 0·5 mm min[minus]1, until fracture occurred. The data, in MPa, were submitted to the analysis of variance (anova) followed by Tukey's...

Oral sensorial complaints, salivary flow rate and mucosal lesions in the institutionalized elderly

Journal of Oral Rehabilitation — Tue, 01 Dec 2009 00:00:00 +0100

Summary The aims of this study were to determine the prevalence of oral sensorial complaints, salivary flow rate and oral mucosal lesions in the institutionalized and non-institutionalized elderly. The study included 280 institutionalized and 61 non- institutionalized elderly people. Dry mouth, burning mouth sensations, taste disturbances, salivary flow rate and oral mucosal lesions were assessed and compared between groups. A greater number of the institutionalized elderly had dry mouth (P = 0·001) and taste disturbance (P = 0·035) compared to non-institutionalized elderly. The institutionalized elderly also had significantly lower salivary flow rate (P < 0·0001). Positive correlation was found between salivary flow rate and perception of dry mouth in the institutionalized elderly (rs ...

Oral parafunctions as risk factors for diagnostic TMD subgroups

Journal of Oral Rehabilitation — Tue, 01 Dec 2009 00:00:00 +0100

Summary The frequency of diurnal clenching and/or grinding and nail-biting habits was assessed in patients affected by temporomandibular disorders (TMDs) and in healthy controls in order to investigate the possible association between these oral parafunctions and different diagnostic subgroups of TMDs. The case group included 557 patients (127 men, mean age ± SD = 34·5 ± 15·4 years; 430 women, mean age ± SD = 32·9 ± 14·1 years) affected by myofascial pain or disc displacement or arthralgia/arthritis/arthrosis. The control group included 111 healthy subjects (55 men, mean age ± SD = 37 ± 15·2 years; 56 women, mean age ± SD = 38·2 ± 13·8 years). Multinomial logistic regression analysis was used to assess the association between oral parafunctions and TMDs, after adjusting for ...

Classifying degenerative joint disease by the RDC/TMD and by panoramic imaging: a retrospective analysis

Journal of Oral Rehabilitation — Tue, 01 Dec 2009 00:00:00 +0100

This study adds to recent criticisms of the clinical validity of the RDC/TMD, with regard to DJD. (Source: Journal of Oral Rehabilitation)

Salivary flow rate and clinical characteristics of patients with xerostomia according to its aetiology

Journal of Oral Rehabilitation — Tue, 01 Dec 2009 00:00:00 +0100

In conclusion, patients with xerostomia displayed various degrees of discomfort related to the quality of life according to the aetiology of their conditions. (Source: Journal of Oral Rehabilitation)

Surgical and prosthetic reconsiderations in patients with maxillectomy

Journal of Oral Rehabilitation — Mon, 30 Nov 2009 00:00:00 +0100

Summary The purpose of this study was to establish and evaluate new possibilities for rehabilitation of patients with obturator prosthesis who had undergone partial or total maxillectomy because of tumour ablation surgery. Eleven patients with maxillary defects were reconstructed with a computer-aided design/computer-aided manufacturing designed prosthesis. Missing retention was gained by inserting implants in the remaining bone, so that an expansion of the surgical defect to gain further retention could be avoided. All patients were treated successfully according to the previously described treatment plan. The Obturator Functioning Scale (OFS) of the Memorial Sloan-Kettering Cancer Centre was applied to evaluate the functional quality of the obturator prosthesis and patient's satisfaction...

Influence of factors related to implant stability detected by wireless resonance frequency analysis device

Journal of Oral Rehabilitation — Mon, 30 Nov 2009 00:00:00 +0100

Summary Resonance frequency analysis (RFA) was introduced as a method for measuring implant stability more than a decade ago. Implant stability quotient (ISQ) values obtained using a recently introduced wireless RFA device have made it possible to evaluate stability in a non-invasive technique; however, there are few studies of the factors that affect ISQ values determined using this device. The aim of the present study was to evaluate the association between ISQ values determined by wireless RFA and various factors related to dental implant stability using a pig cortical bone model. Dental implants (Replace® Select Tapered implants) with a length of 10 mm were placed into pig cortical bone samples, then, ISQ values were determined using wireless RFA under various conditions (probe orient...

The use of likelihood ratio methodology to find predictors of treatment outcome in patients with dental injury diagnoses

Journal of Oral Rehabilitation — Mon, 30 Nov 2009 00:00:00 +0100

Summary The purpose of this prospective, cohort study of patients with dental injuries was to develop prediction rules to predict treatment response related to the management of dental injuries. The study comprised of 130 patients with a single permanent incisor affected by a dental displacement (n = 100) or fracture injury (n = 30). Laser Doppler flowmetry (LDF) measurements of pulpal blood flow (PBF) were taken 6 and 18 weeks after dental injury Treatment response (success or failure) was categorized based on findings of clinical and radiographical evaluation after 9 months. Forty-four (34%) subjects were categorized as treatment success (absence of loss of sensitivity, periapical radiolucency and grey discolouration of crown), 43 (33%) as treatment failures (loss of sensitivity, and per...

Relationship between the unilateral TMJ osteoarthritis/osteoarthrosis, mandibular asymmetry and the EMG activity of the masticatory muscles: a retrospective study

Journal of Oral Rehabilitation — Mon, 30 Nov 2009 00:00:00 +0100

Summary The purpose of this retrospective study was to investigate the relationship between the unilateral temporomandibular joint (TMJ) osteoarthritis/osteoarthrosis (OA), mandibular asymmetry and electromyographic (EMG) activity of the masticatory muscles. Twenty-two Japanese women (aged 23·2 ± 5·4 years) and 10 Japanese men (aged 22·4 ± 2·8 years) exhibiting unilateral TMJ OA were included in this study. Two angular and seven linear measurements were obtained for the analysis of the skeletal hard tissues. The cephalometric measurement values (CV) were normalized using the CV ratio for the evaluation of the degree of mandibular asymmetry. The EMG was recorded during maximal voluntary clenching efforts for 10 s in the intercuspal position. The average values of integral EMG (iEMG) o...

Is the tongue position influenced by the palatal vault dimensions?

Journal of Oral Rehabilitation — Wed, 18 Nov 2009 00:00:00 +0100

Summary The influence of the palatal vault dimensions on tongue position is here studied through evaluation of the in-mouth air cavity (IMAC) volume when the mandible is in maximal intercuspal position. A sample of 35 women (mean age 21·2 ± 1·0) and 15 men (mean age 22·1 ± 0·9) was selected. The sagittal cross-section area of the IMAC, which is modulated by the tongue position, was measured on lateral cephalograms. Dental casts were used to measure the palatal vault volume, which was defined by the occlusal plane, the hard palate and the posterior face of the second molars. Palatal vault volume allowed deduction of the IMAC volume through a rule of three procedure relating volume to area ratios. No IMAC could be calculated from cephalograms of 10 subjects who had the tongue stuck to ...

Widespread pain symptoms and psychological distress in southern Chinese with orofacial pain

Journal of Oral Rehabilitation — Tue, 17 Nov 2009 00:00:00 +0100

Summary The study investigated the experience of widespread pain (WP) symptoms and psychological distress in southern Chinese with orofacial pain (OFP). A community-based, cross-sectional case[ndash]control study involving people aged 35[ndash]70 registered with the Hospital Authority/University of Hong Kong Family Medicine Clinic served as the sampling frame. People with recent OFP symptoms and a group without OFP took part. Standard questions were asked about OFP conditions in the previous month. Psychological status was evaluated through depression, and non-specific physical symptoms (NPS) scores were measured with depression and somatization sub-scales of the Symptom Checklist-90. Widespread pain was determined using body outline drawings to identify painful sites prior to a standard c...

Influence of edentulousness on gonial angle, ramus and condylar height

Journal of Oral Rehabilitation — Fri, 13 Nov 2009 00:00:00 +0100

In conclusion, the morphology of the mandible changes as a consequence of tooth loss, which can be expressed as a widening of the gonial angle and shortening of the ramus and condylar height. These findings highlight the importance of rehabilitation of the masticatory system to maintain good functioning of the masticatory muscles for as long as possible. (Source: Journal of Oral Rehabilitation)

Testing the retention of attachments for implant overdentures – validation of an original force measurement system

Journal of Oral Rehabilitation — Wed, 11 Nov 2009 00:00:00 +0100

Summary The aim of this study was to validate an original portable device to measure attachment retention of implant overdentures both in the lab and in clinical settings. The device was built with a digital force measurement gauge (Imada) secured to a vertical wheel stand associated with a customized support to hold and position the denture in adjustable angulations. Sixteen matrix and patrix cylindrical stud attachments (Locator®) were randomly assigned as in vitro test specimens. Attachment abutments were secured in an implant analogue hung to the digital force gauge or to the load cell of a traction machine used as the gold standard (Instron Universal Testing Machine). Matrices were secured in a denture duplicate attached to the customized support, permitting reproducibility of their ...

Stability values of titanium dioxide-blasted dental implants in edentulous maxillas: a 3-year pilot study

Journal of Oral Rehabilitation — Thu, 05 Nov 2009 00:00:00 +0100

Summary The purpose of this follow-up study was to measure the resonance frequency of Astra Tech TiO2 blasted implants at second surgery, at one and 3 years of loading. Secondly, it was investigated whether resonance frequency at second surgery could discriminate between successful implants and those that will fail over a 3-year period. Fifty titanium dioxide-blasted implants in eight consecutive patients with edentulous maxillas seeking fixed rehabilitations, were included in the study at abutment connection after 6 months of healing. Resonance frequency, clinical and radiographic records were obtained at abutment connection and after one and 3 years of loading. The cumulative survival rate after 3 years was 100%. The mean resonance frequencies were 65 ± 4·8 implant stability quotient (...

Effects of periodontal afferent inputs on corticomotor excitability in humans

Journal of Oral Rehabilitation — Mon, 02 Nov 2009 00:00:00 +0100

Summary The aim of the present study was to determine in humans whether local anaesthesia (LA) or nociceptive stimulation of the periodontal ligaments affects the excitability of the face primary motor cortex (MI) related to the tongue and jaw muscles, as measured by transcranial magnetic stimulation (TMS). Twelve healthy volunteers (11 men, 1 woman, 25·3 ± 4·2 years) participated in two 3-h sessions separated by 7 days. The LA carbocain or the nociceptive irritant capsaicin was randomly injected into the periodontal ligament of the lower right central incisor. In both sessions, TMS[ndash]motor evoked potential (MEP) stimulus[ndash]response curves and corticomotor maps were acquired for the tongue and masseter muscles before (baseline) and at 5, 30 and 60 min post-application of carboca...

Psychometric properties of the modified Symptom Severity Index (SSI)

Journal of Oral Rehabilitation — Mon, 02 Nov 2009 00:00:00 +0100

In conclusion, the modified Symptom Severity Index has excellent psychometric properties for use as an instrument to measure pain in subjects with TMD. The most important characteristic of this pain is location, while the temporal dimensions are important for jaw pain. Further research is needed to confirm these findings and assess relationships between dimensions of pain as experienced in other chronic pain disorders. (Source: Journal of Oral Rehabilitation)

Simvastatin enhances bone formation around titanium implants in rat tibiae

Journal of Oral Rehabilitation — Mon, 02 Nov 2009 00:00:00 +0100

In conclusion, although the dose equivalent to that used in human patients with hypercholesterolemia was not effective, a simvastatin dose of 5 mg kg[minus]1 or higher increased medullary bone formation around the titanium. In contrast, no effect of simvastatin on pre-existing cortical bone was indicated. (Source: Journal of Oral Rehabilitation)

Occupational changes in manual tactile sensibility of the dentist

Journal of Oral Rehabilitation — Fri, 30 Oct 2009 00:00:00 +0100

Summary The aim of this study was to find out if the use of vibrating tools (drill, ultrasonic scaler [hellip]) in dental practice has negative side effects on the manual tactile sensibility of the dentist. The sensory tests were performed on 50 subjects, who were allocated to three different groups according to their occupation and the length of their working experience. The first test group consisted of 20 dentists, who had more than 25 years of work experience. As a control group, 20 non-dentists were recruited to obtain a similar age distribution as the former test group. A final group consisted of 10 dentists with more than 1 year of work experience. All subjects underwent three tests: light-touch sensation test, two-point discrimination test and thermal sensation test on the thumb an...

Posturography as a diagnostic aid in dentistry: a systematic review

Journal of Oral Rehabilitation — Thu, 29 Oct 2009 00:00:00 +0100

Summary The aim of this systematic review of the literature was to assess the scientific evidence for detectable correlations between the stomatognathic system and whole-body posture and to provide information on the relevance of posturography as a diagnostic aid in dentistry. A literature survey was performed using the Medline database, covering the period from January 1966 to May 2009, and using the medical subject headings. After selection, 21 articles qualified for the final analysis. Only one study was judged to be of medium/high quality, with all of the rest classified as of low quality design. Only two studies included follow-up of 28 days and 1 year. Overall, 14 of the studies reported detectable correlations between the stomatognathic system and body posture in at least one of the...

Is the reverse cycle during chewing abnormal in children with primary dentition?

Journal of Oral Rehabilitation — Tue, 27 Oct 2009 00:00:00 +0100

Summary The purpose of this study was to clarify whether the reverse cycle during chewing is abnormal in children with primary dentition. Children with normal primary dentition (N = 23; 5·5 ± 0·8 years) and female adults (N = 25; 20·7 ± 1·9 years) participated in this study. Chewing movement was recorded using an opto-electronic analysis system with six degrees-of-freedom (TRI-MET, Tokyo-shizaisha; Tokyo, Japan). Each subject was given a stick of chewing gum (new TRIDENT, WARNER-LAMBERT CO., Morris Plains, NJ, USA) and instructed to chew it normally. Starting from the maximum intercuspal position, each chewing sequence was recorded over a period of 20 s. A custom computer program identified individual chewing cycles. Frontal views were used to distinguish seven types of cycle shapes ...

Discriminant analysis of patients' reasons for choosing or refusing treatments for partial edentulism

Journal of Oral Rehabilitation — Tue, 27 Oct 2009 00:00:00 +0100

Summary The aim of the study was to explore partially edentulous patients' reasons for choosing or refusing prosthodontic treatment with removable partial dentures (RPD), fixed partial dentures (FPD) and implant partial dentures (IPD). Clinical and oral health-related quality of life measures were collected from 165 partially edentulous patients undergoing treatment. Patients' preferences were recorded and reasons for choosing or refusing treatments were measured with 32 questions using a five-point Likert scale. Descriptive statistics, chi-square and multiple logistic regression were used to compare patients' preferences according to clinical variables. Discriminant analysis was used to examine the impact of each reason for a patient's decision to choose or refuse treatment options. Resul...

Retention of zirconia copings on zirconia implant abutments cemented with provisional luting agents

Journal of Oral Rehabilitation — Wed, 21 Oct 2009 23:00:00 +0100

Summary The purpose of this study is to measure and compare the retentive force of zirconia-based all-ceramic crowns cemented on zirconia abutments using five provisional luting agents. In addition, the effect of sandblasting and thermocycling on the retentive force was evaluated. Two hundred zirconia abutments and copings were fabricated (Procera system; Nobel Biocare) and divided into five groups. Hy bond temporary cement hard (Hard), Hy bond temporary cement soft (Soft), experimental temporary cement (New), Tempbond NE (Temp) and Freegenool temporary pack (Pack) were used according to the manufacturers' instructions. Each group was divided into two groups, one with and one without sandblasting. Furthermore, thermocycling up to 2000 cycles was conducted on half of each group. After 24 h ...

Daily chewing gum exercise for stabilizing the vertical occlusion

Journal of Oral Rehabilitation — Tue, 20 Oct 2009 23:00:00 +0100

Summary We investigated the effects of a chewing gum exercise program on occlusal conditions and evaluated compliance of subjects. Thirty-five healthy adult volunteers (26 males and nine females) were asked to chew gum for 10[ndash]15 min before or after three meals daily for four weeks. Occlusal conditions were recorded as occlusal parameters, such as occlusal contact area, occlusal contact force, and pressure using dental prescale films. These parameters were evaluated by an Occluzer before the exercise period commenced, after four weeks of exercise, and then one month after the end of the exercise period. These parameters were statistically compared using one-way ANOVA. We found that: (i) after four weeks of exercise, anterior and posterior occlusal contact areas and forces were signifi...

Decrease in stereognostic ability of the tongue with age

Journal of Oral Rehabilitation — Wed, 14 Oct 2009 23:00:00 +0100

Summary Rehabilitation of eating and swallowing functions from the viewpoint of quality of life should attempt to restore not only the physical, but also sensory function. As the size and shape of the intra-oral bolus of food provides oral sensory information important for eating and swallowing, we investigated the stereognostic ability of the tongue in 269 young adults (mean age: 24·5 years) and 60 seniors (mean age: 80·5 years); all of whom had no eating or swallowing complaints. Assessment of the stereognostic ability involved identifying 20 differently shaped test pieces placed in the oral cavity. The young adults identified a significantly higher number of differently shaped test pieces than the seniors (mean correct number of responses: 16·5 and 10·1 respectively; P < 0·001). Ge...

Oromandibular dystonia and hormonal factors: twelve years follow-up of a case report

Journal of Oral Rehabilitation — Tue, 13 Oct 2009 23:00:00 +0100

We report on a 30-year-old woman affected with OMD with a 12-year follow-up. Focal dystonia involved an involuntary activity of the lateral pterygoid muscles causing forceful jaw displacement in the maximal protrusive position. These episodes initially occurred during jaw function and increased up to an open-lock with bilateral pre-auricular pain. Dystonic spasms were absent during sleep and were reduced temporarily by sensory tricks. Treatment with botulinum toxin type A (BTX) was performed during three different sessions over a 1-year period. Electromyographic-guided BTX injections into the lateral pterygoid muscles were given with cannula electrodes. Botox reduced the involuntary activity of the muscles. Recurrence and exacerbation of dystonic symptoms occurred during the two pregnancie...

Dynamic viscoelastic properties of vinyl polysiloxane denture soft lining materials

Journal of Oral Rehabilitation — Tue, 13 Oct 2009 23:00:00 +0100

Summary The aim of this study was to investigate the dynamic viscoelastic properties of seven commercially available vinyl polysiloxane denture soft lining materials. Five rectangular specimens (2 × 10 × 30 mm) were prepared from each material. The complex modulus E* (MPa) and loss tangent (tan [delta]) of each specimen were determined with a non-resonance forced vibration method using an automatic dynamic viscoelastometer at 1 Hz after 1 day of dry storage, and after 1, 30, 60, 90 and 180 days of wet storage at 37 °C. All data were analysed using one-way anova and Bonferroni/Dunn's test for multiple comparisons with a significance level of P < 0·01. All materials varied widely in terms of viscoelasticities and showed both an increase in E* and a decrease in tan [delta] at 1 Hz after t...

Effect of denture base materials on mRNA expression of the adhesion-associated genes from the Streptococcus mutans biofilms

Journal of Oral Rehabilitation — Tue, 13 Oct 2009 23:00:00 +0100

Summary Dental caries is one of the most important reasons for the failure of removable partial denture. The adhesion-associated genes of Streptococcus mutans, such as gtfBCD, ftf and gbpB, might play an important role in bacterial adhesion to denture base materials. Therefore, the aim of this study was to investigate the influence of denture base materials (heat-curing acrylic resins, cobalt-chromium alloy and ceramics served as control) on the formation of S. mutans biofilms and the mRNA expression of adhesion-associated genes. The viability of the bacteria in biofilms was determined by colony-forming units at 24 and 72 h, meanwhile one sample of each group was prepared for scanning electron microscope (SEM) at 24 h. A real-time reverse transcription polymerase chain-reaction was used to...

Revised dental beliefs survey: reliability and validity of a 22-item modified Turkish version

Journal of Oral Rehabilitation — Wed, 30 Sep 2009 23:00:00 +0100

In conclusion, a 22-item modified version of the DBS-R in Turkish appears reliable and valid. (Source: Journal of Oral Rehabilitation)

Colour compatibility between teeth and dental shade guides in Quinquagenarians and Septuagenarians

Journal of Oral Rehabilitation — Tue, 29 Sep 2009 23:00:00 +0100

Summary The aim of this investigation was to determine colour compatibility between dental shade guides, namely, VITA Classical (VC) and VITA 3D-Master (3D), and human teeth in quinquagenarians and septuagenarians. Tooth colour, described in terms of L*a*b* values of the middle third of facial tooth surface of 1391 teeth, was measured using VITA Easyshade in 195 subjects (48% female). These were compared with the colours (L*a*b* values) of the shade tabs of VC and 3D. The mean coverage error and the percentage of tooth colours being within a given colour difference ([Delta]Eab) from the tabs of VC and 3D were calculated. For comparison, hypothetical, optimized, population-specific shade guides were additionally calculated based on discrete optimization techniques for optimizing coverage. M...

Distance between the medialis angles of the eyes as an anatomical parameter for tooth selection

Journal of Oral Rehabilitation — Fri, 18 Sep 2009 23:00:00 +0100

Summary During the construction of a removable prosthesis, the lack of pre-extractions records turns the selection of artificial maxillary anterior teeth into a complex procedure. The aim of this study was to identify a mathematical relation between the anterior dental segment and the distance between the medialis angles of the eyes, for selecting the suitable width of the six maxillary anterior teeth. Standardized digital images of 80 dentate Brazilian subjects were used to measure both facial and oral structures when viewed from the frontal aspect through an image processing program. Accurate casts were made to measure on a curve the distance between the maxillary canines. Parametric statistics was performed to analyse the results (P < 0·05). The distance between the medialis angles of ...

Reliability of maximum bite force measurements in age-varying populations

Journal of Oral Rehabilitation — Tue, 15 Sep 2009 23:00:00 +0100

Summary In order for bite forces to be used clinically, they must be reliable. While bite force transducers are accurate and precise during bench tests, widely varying reliabilities of intra-oral bite forces have been reported when measured in human subjects. Because few studies have reported total reliability, the clinical use of intra-oral bite forces measurements remains questionable. The purposes of this study were to (i) estimate total reliability, including both within- and between-session reliabilities, of repeated maximum incisor and molar bite force measurements and (ii) demonstrate how extraneous variation affects reliability by comparing estimates for which the effects of age have and have not been controlled. A sample of 28 healthy subjects with Class I normal occlusion (seven ...

Self-reported severity of taste disturbances correlates with dysfunctional grade of TMD pain

Journal of Oral Rehabilitation — Thu, 10 Sep 2009 23:00:00 +0100

The objectives of this study were to compare the prevalence of self-reported taste disturbances in TMD pain patients and in a control population, and to determine whether frequency of taste disturbances was correlated with dysfunctional grade of TMD pain. Subjects were 2026 people within a German population sample and 301 consecutive TMD patients diagnosed using the Research Diagnostic Criteria. Taste disturbances were measured using two questions from the Oral Health Impact Profile. Dysfunctional grade of TMD pain was measured with the Graded Chronic Pain Scale. A two-sample test of proportions revealed that TMD patients reported a greater frequency of taste disturbances, 6%, than did the general population subjects, 2% (P < 0·001). Moreover, the frequency of taste disturbances correlate...

The effects of fixed orthodontic appliances on saliva flow rate and saliva electrolyte concentrations

Journal of Oral Rehabilitation — Wed, 09 Sep 2009 23:00:00 +0100

This study demonstrated that saliva flow rate was increased and saliva electrolytes were changed at early stage when placing fixed orthodontic appliances, which was considered due to increased mechanosensation. (Source: Journal of Oral Rehabilitation)

Cognitive function and number of teeth in a community-dwelling elderly population without dementia

Journal of Oral Rehabilitation — Wed, 09 Sep 2009 23:00:00 +0100

In conclusion, associations were found between normal-range cognitive function and the numbers of sound and decayed teeth, after adjustment for various confounding factors, in an elderly Japanese population. (Source: Journal of Oral Rehabilitation)

Clinical evaluation of Procera AllCeram crowns in Japanese patients: results after 5 years

Journal of Oral Rehabilitation — Wed, 09 Sep 2009 23:00:00 +0100

Summary Procera AllCeram crowns were prospectively evaluated clinically in both anterior and posterior regions in Japanese. One-hundred and one crowns were fabricated for 57 patients at the Tsurumi University Dental Hospital from August 2001 to October 2002 and evaluated according to the California Dental Association (CDA) quality evaluation system at baseline and annually at all follow-up examinations for 5 years. The plaque index (PI) and gingival index (GI) were recorded, and chipping and fracture were checked at the same time as well. A total of 75 Procera AllCeram crowns were evaluated, and the cumulative survival rate was 90·2% over the 5-year clinical trial. Six crowns experienced fractures within the veneering porcelain and from aluminium oxide coping, all of which occurred on the...

Postural and dynamic masseter and anterior temporalis muscle EMG repeatability in serial assessments

Journal of Oral Rehabilitation — Tue, 08 Sep 2009 23:00:00 +0100

In conclusion this study assessed the reliability, repeatability and limitations of postural and various dynamic masseter and temporalis EMG recordings for serial assessment. (Source: Journal of Oral Rehabilitation)

Influence of material and diameter of pre-fabricated posts on maxillary central incisors restored with crown

Journal of Oral Rehabilitation — Fri, 21 Aug 2009 23:00:00 +0100

Summary Numerous research works have studied the effect of post-design parameters on the mechanical behaviour of restored teeth without reaching any clear conclusions. Previous works by the authors ascertained the effect of material and post-dimensions for non-crowned restored teeth. The aim of this work was to study the effect of post-material and diameter for crowned teeth. First, an experimental fracture strength test was performed on eighteen extracted human maxillary central incisors. Teeth were decoronated, treated endodontically and restored (nine with glass fibre posts and nine with stainless steel posts). Several post-diameters were used. The final crown restoration was carried out using a reinforced glass-ceramic material. Failure loads were recorded and results were compared usi...

Marginal bone loss around three different implant systems: radiographic evaluation after 1 year

Journal of Oral Rehabilitation — Thu, 20 Aug 2009 23:00:00 +0100

This study was designed to radiographically evaluate the effect of surface macro-and microstructures within the coronal portion of the external hex implant at the marginal bone change after loading. The fifty-four patients included in the study were randomly assigned to treatment groups with rough-surface implants (TiUnite, n = 45), a hybrid of smooth and rough surface implants (Restore, n = 45) or rough-surface with microthreads implants (Hexplant, n = 45). Clinical and radiographic examinations were conducted at the time of implant loading (baseline) and at 1-year post-loading. A three-level mixed-effect ancova was used to test the significance of the mean marginal bone change of the three implant groups from baseline to 1-year follow-up. At 1-year, significant differences were noted in ...

A case of obstructive sleep apnoea with anterior cervical osteophytes

Journal of Oral Rehabilitation — Thu, 20 Aug 2009 23:00:00 +0100

Summary Osteophytes of the cervical spine are usually seen in elderly adults. When prominent, they have been blamed for dysphagia, cough, dysphonia and dyspnoea. This paper reports on an obstructive sleep apnoea (OSA) patient with cervical spinal osteophytes, one cause of airway obstruction. A 75-year-old male complained of pronounced snoring. The diagnosis was mild OSA, apnoea hypopnoea index was 9·4. Patient reported no restrictions in neck movements, experiences of neck pain or neck trauma. Previously, patient underwent a tonsillectomy due to discomfort in the pharyngeal region. A lateral cephalometric image was taken to observe airway before oral appliance therapy. The image revealed the presence of large osteophytes or sclerotic enthesopathy, lying on anterior surfaces from the fourt...

Effects on blood pressure after treatment of obstructive sleep apnoea with a mandibular advancement appliance – a three-year follow-up

Journal of Oral Rehabilitation — Wed, 12 Aug 2009 23:00:00 +0100

Summary Obstructive sleep apnoea (OSA) is a highly prevalent sleep disorder; it affects 4% of males and 2% of females. Hypertension has been shown to occur in 28[ndash]57% of OSA patients. There is a steady increase in evidence linking OSA to long-term cardiovascular morbidity including hypertension. The purpose of this study was to investigate whether mandibular advancement oral appliance (OA) treatment of OSA affects the patient's blood pressure (BP) in a 3-month and a 3-year perspective. Twenty-nine consecutive patients, with verified OSA defined as apnoea index (AI) >5 per hour and/or apnoea/hypopnoea index (AHI) [ge]10 per hour, received an OA as treatment. BP was measured on three occasions; before treatment, after 3 months of treatment, and after 3 years of treatment. BP was measure...

Small unilateral jaw gap variations: equilibrium changes, co-contractions and joint forces

Journal of Oral Rehabilitation — Tue, 11 Aug 2009 23:00:00 +0100

Summary After complex prosthetic reconstructions, small differences in vertical distances between the left and right side of the jaw may occur during jaw closing, nevertheless providing bilateral tooth contacts in intercuspation by small deformations of the mandible. Their effects on the co-contraction of the masticatory muscles, the temporomandibular joint reaction forces, and the point of application of the resultant bite force vector in the maxillary occlusion plane [ndash] the so-called reduction point [ndash] have not been investigated, thus far simultaneously in one sample. The main goal of this study was to investigate variations of these measures in an experimental intercuspation simulated by one anterior and two posterior force transmission points. (Source: Journal of Oral Rehabil...

Patient-generated aspects in oral rehabilitation decision making I. Comparison of traditional history taking and an individual systematic interview method

Journal of Oral Rehabilitation — Sun, 02 Aug 2009 23:00:00 +0100

Summary Decision making in oral rehabilitation is often based on diagnoses related to impairment of different oral functions. In making the decision when to treat, the dentist must work in cooperation with the patient. By incorporating patient-generated aspects into the decision making process, the dentist finds it easier to decide if and why treatment should be undertaken and what treatment modality to use. The purpose of this study was to describe the potential of an interview method, the 'Schedule for the Evaluation of Individual Quality of Life-Direct Weighting' (SEIQoL-DW), and compare it with a traditional history taking, in generating information to be used in decision making in oral rehabilitation. Fifty-seven participants in need of oral rehabilitation were enrolled in the study. ...

Microbiological risk for periodontitis of abutment teeth in patients with removable partial dentures

Journal of Oral Rehabilitation — Thu, 23 Jul 2009 23:00:00 +0100

Summary Tannerella forsythia, Porphyromonas gingivalis and Treponema denticola are identified as the red complex which exists in high proportions in periodontally diseased patients. The aim of this study was to assess the microbiological risk for periodontitis of abutment teeth in subjects wearing removable partial dentures (RPDs) by measuring the red complex using BANA-ZymeTM test. Thirty-eight subjects (mean age: 62·2 years) with Kennedy Class II partially edentulous arch participated in this study. The red complex and clinical parameters, such as plaque index, gingival index, probing depth and tooth mobility were recorded at abutment teeth in contact with the direct retainer of unilaterally designed RPDs and the corresponding non-abutment teeth on the opposite side. Mean scores for the...

Internal kinematics of the tongue in relation to muscle activity and jaw movement in the pig

Journal of Oral Rehabilitation — Wed, 22 Jul 2009 23:00:00 +0100

Summary To explore the coordinative characteristics of tongue deformation, muscle activity and jaw movement during feeding, six ultrasonic crystals were implanted into the tongue body of ten 12-week-old Yucatan minipigs 1 week before the recording. These crystals formed a wedge-shaped configuration to allow recording dimensional changes in lengths, anterior and posterior widths and posterior thicknesses of the tongue body during feeding. Wire electromyographic activities (EMG) of superior and inferior longitudinalis, verticalis/transversus, genioglossus, styloglossus, masseter and digastricus and jaw movements were recorded simultaneously. Signals from these three sources were synchronized for real-time analyses. The results indicate: (i) dimensional changes were stereotypical in relation ...

Assessment scale of the oral motor performance of children and adolescents with neurological damages

Journal of Oral Rehabilitation — Wed, 15 Jul 2009 23:00:00 +0100

This study shows that the OMAS is an accurate and valid method of assessment of oral motor skills in children and adolescents with neurological damages. (Source: Journal of Oral Rehabilitation)

The effects of manual therapy and exercise directed at the cervical spine on pain and pressure pain sensitivity in patients with myofascial temporomandibular disorders

Journal of Oral Rehabilitation — Mon, 13 Jul 2009 23:00:00 +0100

Summary No studies have investigated the effects of the treatments directed at the cervical spine in patients with temporomandibular disorders (TMD). Our aim was to investigate the effects of joint mobilization and exercise directed at the cervical spine on pain intensity and pressure pain sensitivity in the muscles of mastication in patients with TMD. Nineteen patients (14 females), aged 19[ndash]57 years, with myofascial TMD were included. All patients received a total of 10 treatment session over a 5-week period (twice per week). Treatment included manual therapy techniques and exercise directed at the cervical spine. Outcome measures included bilateral pressure pain threshold (PPT) levels over the masseter and temporalis muscles, active pain-free mouth opening (mm) and pain (Visual Ana...

Comparison of the differences in cephalometric parameters after active orthodontic treatment applying mini-screw implants or transpalatal arches in adult patients with bialveolar dental protrusion

Journal of Oral Rehabilitation — Thu, 09 Jul 2009 23:00:00 +0100

Summary The purpose of this study was to compare the differences in cephalometric parameters after active orthodontic treatment applying mini-screw implants (G1) or transpalatal arches (G2) as anchorage in adult patients with bialveolar dental protrusion needing extraction of four premolars. A total of 34 Chinese patients (18[ndash]33 years) with bialveolar dental protrusion were randomly assigned to G1 and G2. Sliding mechanics and en-masse retraction of anterior teeth were applied to close extraction spaces. The changes in skeletal, dental and soft tissues were analyzed in both groups on lateral cephalograms before and after active orthodontic treatment. Independent samples and paired-samples t-tests were utilized to analyze the morphological changes in both groups. ANB angle was decreas...

Calibration of T-Scan® sensors for recording bite forces in denture patients

Journal of Oral Rehabilitation — Mon, 06 Jul 2009 23:00:00 +0100

This study assesses the reliability of T-Scan® sensors with and without protection materials and develops calibration curves that allow measurement of absolute forces with the T-Scan III®. (Source: Journal of Oral Rehabilitation)

Use of sonographic elastography of the masseter muscles for optimizing massage pressure: a preliminary study

Journal of Oral Rehabilitation — Mon, 06 Jul 2009 23:00:00 +0100

Summary To examine the stiffness of the masseter muscle using sonographic elastography and to investigate its relationship with the most comfortable massage pressure in the healthy volunteers. In 16 healthy volunteers (10 men and 6 women), the Masseter Stiffness Index (MSI) was measured using EUB-7000 real-time tissue elastography. They underwent massages at three kinds of pressures using the Oral Rehabilitation Robot (WAO-1). A subjective evaluation regarding the comfort of each massage was recorded on the visual analogue scale. Elastography was also performed in two patients with temporomandibular joint dysfunction with the myofascial pain. The mean MSI of the right and left muscles in the healthy volunteers were 0·85 ± 0·44 and 0·74 ± 0·35 respectively. There was no significant di...

In vivo comparison of force development with various materials of implant-supported prostheses

Journal of Oral Rehabilitation — Wed, 24 Jun 2009 23:00:00 +0100

Summary The purpose of this study was to measure axial loading, generating bending moments on fibre reinforced composite (FRC) implant prostheses using strain-gauged customized abutment in vivo. Bending moments of conventional implant prosthetic material were also measured and the data were compared with those for FRC. Three unit fixed dental prostheses were made for two dental implant fixtures, which had been functioning properly for more than one year using TesceraTM ATLTM, porcelain fused to metal and gold as occlusal material. Three patients participated in this study; two patients had two implants on one side of the mandible and one had two implants on both sides of the mandible. Five sets of fixed dental prostheses were fabricated for each material and these were cemented with Temp-b...

Electromyographic standardized indices in healthy Brazilian young adults and data reproducibility

Journal of Oral Rehabilitation — Sun, 21 Jun 2009 23:00:00 +0100

Summary The determination of normal parameters is an important procedure in the evaluation of the stomatognathic system. We used the surface electromyography standardization protocol described by Ferrario et al. (J Oral Rehabil. 2000;27:33[ndash]40, 2006;33:341) to determine reference values of the electromyographic standardized indices for the assessment of muscular symmetry (left and right side, percentage overlapping coefficient, POC), potential lateral displacing components (unbalanced contractile activities of contralateral masseter and temporalis muscles, TC), relative activity (most prevalent pair of masticatory muscles, ATTIV) and total activity (integrated areas of the electromyographic potentials over time, IMPACT) in healthy Brazilian young adults, and the relevant data reproduc...

Relation of dietary preference to bite force and occlusal contact area in Japanese children

Journal of Oral Rehabilitation — Sun, 21 Jun 2009 23:00:00 +0100

Summary The purpose of this study was to examine the relationship of dietary preference to bite force and occlusal contact area in Japanese elementary school children. A total of 348 children, aged 7[ndash]12 years, from two public elementary schools located in Okayama Prefecture, Japan, participated in the study. Clinical examination included decayed, missing and filled teeth (dmft and DMFT), and total numbers of deciduous and permanent teeth. Bite force and occlusal contact area were measured using a pressure-detecting sheet. Dietary preference was assessed using a questionnaire in which the answers were given in like/dislike form. Mann[ndash]Whitney U-test and multiple logistic regression analysis were applied to analyse the data. In multiple logistic regression analysis after adjustmen...

Impact of prosthodontic status on oral wellbeing: a cross-sectional cohort study

Journal of Oral Rehabilitation — Mon, 15 Jun 2009 04:00:00 +0100

Summary To assess the impact of the prosthodontic status on oral health-related quality of life and satisfaction. We performed a cohort study at the University Clinic in Salamanca in which a group requesting prosthetic treatment (P0; n = 31) was compared with a group treated with conventional prostheses (P1; n = 29) and a control group (C; n = 18) not requesting or treated with prostheses. A clinical examination for the presence of caries, periodontal disease and edentulism was carried out. An assessment was made on the impact on the quality of life employing the oral impacts on daily performance-Spanish version and the oral health impact profile 14-Spanish version, and wellbeing was assessed by the self-rated satisfaction on a 0[ndash]10 scale. The P0 cohort was significantly less satisfi...

Patients' expectations and satisfaction of complete denture therapy and correlation with locus of control

Journal of Oral Rehabilitation — Sun, 07 Jun 2009 04:00:00 +0100

Summary Considering the importance of patients' satisfaction with complete denture therapy and the influence of psychosocial aspects and expectations regarding satisfaction with their dentures, the present study aimed to test for a correlation between locus of control profiles and expectations before and satisfaction after complete denture therapy. Sixty-four patients rated their expectations for aesthetic and functional results of complete denture therapy on a 10-cm visual analogue scale (VAS), using scores from 0 (worst results) to 10 (best results). A similar questionnaire was used regarding satisfaction after final denture adjustments. Patients also answered a locus of control questionnaire in the initial interview. anova and a chi-squared test were used to test for correlations among ...

Clinical performance of extended zirconia frameworks for fixed dental prostheses: two-year results

Journal of Oral Rehabilitation — Tue, 02 Jun 2009 04:00:00 +0100

Summary The purpose of this prospective cohort study was to assess the performance of tooth-supported, extended zirconia, fixed dental prostheses (FDPs). Thirty FDPs with span-lengths between 36 and 46 mm (mean: 40·33 mm), four to seven units and with connector dimensions of [sim]9 mm2 were inserted (19 in the posterior region, 11 including anterior teeth) using glass[ndash]ionomer cement and assessed (aesthetic evaluation, failures, hypersensitivity/tooth vitality, secondary caries, pocket depth, decementation and chipping) at baseline and after 2 years. Differences between baseline and 2-year recall were analysed using the Wilcoxon signed-rank test for matched pairs. There were five failures. One FDP revealed a core fracture at the base of the connector, probably caused by a damage indu...

Distance of the contact glide in the closing masticatory stroke during mastication of three types of food

Journal of Oral Rehabilitation — Mon, 18 May 2009 04:00:00 +0100

This study was designed to characterize the distance of the contact glide in the closing masticatory stroke in healthy adult subjects, during chewing of three types of food (crustless bread, chewing gum and peanuts). Mandibular movements (masticatory movements and laterality movements with dental contact) were registered using a gnathograph (MK-6I Diagnostic System) on the right and left side during unilateral chewing of the three food types. Length of dental contact was measured in masticatory cycle, which is defined as where the terminal part of the chewing cycles could be superimposed on the pathways taken by the mandible during lateral excursions with occlusal contacts. The length of dental contact during mastication of chewing gum is 1·46 ± 1 mm, during chewing of soft bread is 1·3...

Research recommendations from the fifth scientific meeting of the TMJ association: can studies of comorbidities with tmjds reveal common mechanisms of disease?

Journal of Oral Rehabilitation — Sun, 15 Mar 2009 02:54:58 +0100

Authors: Cowley AW PMID: 19278375 [PubMed - in process] (Source: Journal of Oral Rehabilitation)

Influence of food properties and body position on swallowing-related muscle activity amplitude.

Journal of Oral Rehabilitation — Fri, 13 Feb 2009 08:55:49 +0100

This study was designed to examine the effect of different food properties and body positions on electromyographic amplitudes of the anterior tongue (AT) and suprahyoid (SH) muscles during swallowing in normal subjects (six men and three women; 21-30 years old). Each subject was asked to swallow three foods (consisting of 2.0%, 5.7% or 9.1% of a thickening agent dissolved in water) with different textural properties in one of four body positions: upright, inclined at 60 degrees or 30 degrees , or supine. Surface electromyograms (EMG) were recorded from the anterior tongue and SH muscles, and the integrated and cumulated EMG were used to evaluate the amplitude changes. The increases in food hardness and adhesiveness elevated the integrated and cumulated EMGs of both the AT and SH muscles du...

Dental arch morphology in south-east Asian adults with obstructive sleep apnoea: geometric morphometrics.

Journal of Oral Rehabilitation — Fri, 13 Feb 2009 08:55:43 +0100

Authors: Banabilh SM, Suzina AH, Dinsuhaimi S, Samsudin AR, Singh GD The association between dental arch morphology and the aetiology of obstructive sleep apnoea (OSA) is not clear. To compare dental arch morphology in 108 Asian adults with and without ''OSA, overnight'' hospital polysomnography was performed, and sleep reports were obtained for all subjects. Standardized digital photographs were also taken of the subjects' upper and lower study models. Using 25 homologous landmarks, mean OSA and control dental arch configurations were computed, and subjected to finite-element morphometry (FEM), t-tests and principal components analysis (PCA). Mean upper and lower OSA dental arch morphologies were statistically different from respective Control upper and lower arch morphologies (P <...

Psychosocial profiles of painful TMD patients.

Journal of Oral Rehabilitation — Fri, 13 Feb 2009 08:55:39 +0100

Authors: Manfredini D, Marini M, Pavan C, Pavan L, Guarda-Nardini L The aim of the present investigation is to test the null hypothesis that the presence of psychopathology in patients with temporomandibular disorders (TMD) is related to the presence of pain, independent of its location [(i.e. myofascial and/or temporomandibular joint (TMJ) pain]. Ninety-six (n = 96) patients affected by painful TMD underwent a clinical assessment in accordance with the research diagnostic criteria for TMD (RDC/TMD) guidelines and filled out the Symptoms Check List - Revised (SCL-90-R) instrument to investigate the presence of symptoms of psychopathology. Patients with myofascial pain, alone or combined with TMJ pain, endorsed the highest scores in all SCL-90-R scales and showed the highest percentage ...

Incidence of symptoms and signs of TMD following third molar surgery: a controlled, prospective study.

Journal of Oral Rehabilitation — Fri, 13 Feb 2009 08:55:35 +0100

Authors: Juhl GI, Jensen TS, Norholt SE, Svensson P The purpose of this prospective study was to investigate if third molar surgery is associated with the development of symptoms and signs of temporomandibular disorders (TMD) during a 6-month post-operative observation period using the Research Diagnostic Criteria for TMD (RDC/TMD) instrument. Seventy-two subjects eligible for third molar surgery under local anaesthesia (patients) were included. Patients were examined according to the RDC/TMD instrument at baseline, 1 week, 1 and 6 months after surgery. Twenty-five age- and sex-matched healthy non-operative control subjects (controls) were included and examined at baseline and at 6 months. In the patient group, we found: (i) reduced range of maximum jaw opening at one week after surger...

The Association between health-related quality of life and prosthetic status and prosthetic needs in Taiwanese adults.

Journal of Oral Rehabilitation — Mon, 19 Jan 2009 05:00:00 +0100

The objective of this study was to describe aspects of prosthetic statuses and needs and to evaluate their relationship with health-related quality of life in Taiwan. The study participants, aged 18 years and above, were recruited from a community survey, and each of the total 2469 participants received a dental examination and completed a questionnaire. Multivariable analysis was used to assess the adjusted means of health-related quality of life (SF-36) in both prosthetic status and need. The results showed that 12.6% of those aged 65 years and above were edentulous. The proportion of prosthetic need increased as age increased (39.7% to 61.3%). Multivariate analysis revealed that participants with 'removable prosthesis' had higher physical health scores than those with 'non-removable pro...

Commentary.

Journal of Oral Rehabilitation — Mon, 22 Dec 2008 05:00:00 +0100

Authors: Suvinen TI, Kemppainen P PMID: 19141054 [PubMed - as supplied by publisher] (Source: Journal of Oral Rehabilitation)

Effects of tooth loss and denture wear on tongue-tip motion in elderly dentulous and edentulous people.

Journal of Oral Rehabilitation — Mon, 01 Dec 2008 05:00:00 +0100

Authors: Yoshikawa M, Yoshida M, Nagasaki T, Tanimoto K, Tsuga K, Akagawa Y The purpose of this study was to clarify quantitatively the differences in tongue-tip motion among the dentulous elderly people and also among the elderly edentulous, both with and without their dentures and, to identify the influence of tooth loss and denture wear on tongue-tip motion. Fourteen young dentulous people, 12 elderly dentulous people and 13 elderly edentulous people participated in this study. Subjects were asked to swallow a 10 mL barium sulfate solution three times. The elderly edentulous people were asked to swallow the solution while wearing dentures and with dentures removed. Functional swallowing was recorded on cine-film with a digital subtraction angiography system. Lateral cinefluorography...

Morphological and molecular changes in denture-supporting tissues under persistent mechanical stress in rats.

Journal of Oral Rehabilitation — Mon, 01 Dec 2008 05:00:00 +0100

Authors: Tsuruoka M, Ishizaki K, Sakurai K, Matsuzaka K, Inoue T The purpose of this study was to determine the effects of mechanical compression on the palatal mucosa using an experimental palatal base. The palatal base was either pressed onto (stress group) or not pressed onto (fit group) rat palatal mucosa. Blood flow was measured and the animals were sacrificed 6-72 h later for analysis. The expression of heat shock protein 70 (HSP70), vascular endothelial growth factor (VEGF) and proliferation cell nuclear antigen (PCNA) was characterized by immunohistochemical staining. For morphometric analysis, connective tissues were divided into bone side and epithelial side tissues. The ratio of PCNA-positive cells (PCNA score) was calculated, and the expressions of mRNA encoding HSP70 and V...

Investigation of infraorbital nerve injury following zygomaticomaxillary complex fractures.

Journal of Oral Rehabilitation — Mon, 01 Dec 2008 05:00:00 +0100

Authors: Sakavicius D, Juodzbalys G, Kubilius R, Sabalys GP The aim of this study was to investigate the severity of infraorbital nerve injury following zygomaticomaxillary complex fractures and to estimate the treatment methods facilitating its functional recovery. A total of 478 patients with unilateral zygomaticomaxillary complex fractures were treated. Infraorbital nerve sensory disturbances were diagnosed in 64.4% of the patients. Injury of the infraorbital nerve was expressed as asymmetry index, which was calculated as a ratio between the affected side and the intact side electric pain detection thresholds at the innervation zone skin before treatment and 14 days, 1, 3, 6 and 12 months postoperatively. A mean asymmetry index of 0.6 +/- 0.03 and 1.9 +/- 0.5 was registered for 57 (...

Low-level laser therapy improves bone repair in rats treated with anti-inflammatory drugs.

Journal of Oral Rehabilitation — Mon, 01 Dec 2008 05:00:00 +0100

Authors: Ribeiro DA, Matsumoto MA Nowadays, selective cyclooxygenase-2 non-steroidal anti-inflammatory drugs have been largely used in surgical practice for reducing oedema and pain. However, the association between these drugs and laser therapy is not known up to now. Herein, the aim of this study was to evaluate the action of anti-COX-2 selective drug (celecoxib) on bone repair associated with laser therapy. A total of 64 rats underwent surgical bone defects in their tibias, being randomly distributed into four groups: Group 1) negative control; Group 2) animals treated with celecoxib; Group 3) animals treated with low-level power laser and Group 4) animals treated with celecoxib and low-level power laser. The animals were killed after 48 h, 7, 14 and 21 days. The tibias were removed...

Possible impact of inflammatory status on C-telopeptide pyridinoline cross-links of Type I collagen and osteocalcin levels around oral implants with peri-implantitis: a controlled clinical trial.

Journal of Oral Rehabilitation — Mon, 01 Dec 2008 05:00:00 +0100

Authors: Tümer C, Aksoy Y, Güncü GN, Nohutcu RM, Kilinc K, Tözüm TF Detection of progression level of peri-implantitis may help in the prevention of oral implant failure. C-telopeptide pyridinoline crosslinks of Type I collagen (ICTP) and osteocalcin (OC) are specific markers of bone turnover and bone degradation. Determination of the ICTP and OC levels in the peri-implant sulcus fluid (PISF) may predict the metabolic and/or inflammatory changes in the peri-implant bone. The aim of this clinical study was to evaluate ICTP and OC levels in the PISF for oral implants with and without peri-implant bone destruction and correlate these levels with the traditional clinical peri-implant parameters (probing depth, plaque index, gingival index and gingival bleeding time...

Salivary cortisol and IgA levels in patients with myofascial pain treated with occlusal appliances in the short term.

Journal of Oral Rehabilitation — Thu, 27 Nov 2008 05:00:00 +0100

Authors: Doepel M, Söderling E, Ekberg EL, Nilner M, LE Bell Y Summary In many studies, the endocrinological response of individuals to different kinds of stresses has been tested. There seems to be widespread agreement that stress, depression, disability and dysfunctional illness behaviors are critical aspects of patients suffering from symptoms like pain, arising out of temporomandibular disorders (TMD). We aimed to explore treatment-induced changes in salivary cortisol, IgA and flow rate values in TMD patients suffering from myofascial pain. Temporomandibular disorders patients (n = 39) were randomized into two groups and treated with two different occlusal appliances. Perceived stress regarding family, work, economy, relationships, general health and stress in general was eval...

Quality of prescription and fabrication of single-unit crowns by general dental practitioners in Wales.

Journal of Oral Rehabilitation — Tue, 18 Nov 2008 05:00:00 +0100

Authors: Jenkins SJ, Lynch CD, Sloan AJ, Gilmour AS Summary The aim of this investigation was to describe the quality of prescription and fabrication of single-unit crowns by general dental practitioners in Wales. One hundred pre-piloted questionnaires were distributed to commercial laboratories in Wales with large catchment areas, and 20 pre-piloted questionnaires were distributed to the production laboratory at the Cardiff Dental Hospital. Information was collected relating to the quality of prescription and master impressions for single-unit crowns. One hundred and seven completed questionnaires were returned (response rate = 89%). Sixty per cent (n = 64) of questionnaires related to single-unit crowns being made in general practice under private funding arrangements, 30% (n = 32) w...

Subjective food intake ability in relation to maximal bite force among Korean adults.

Journal of Oral Rehabilitation — Sat, 15 Nov 2008 05:00:00 +0100

This study examined the relationship between the subjective food intake of 30 food types and their objective bite force to identify the key food items within the 30 food types to achieve a greater depth of masticatory function in Korean adults. A sample of 308 (112 males and 196 females) adults over the age of 20 (average age, 48.6) was selected among patients who visited four dental hospitals in Seoul, Korea. The subjective masticatory ability was evaluated through an interview with food intake ability questionnaires consisting of 30 food types ranging from hard to soft using a five-step Likert scale. The objective maximal bite force was measured using pressure-sensitive films. The relationship between the food intake ability and bite force was analysed and stratified according to age, ge...

Effect of dentinal tubule occlusion by dentifrice containing nano-carbonate apatite.

Journal of Oral Rehabilitation — Sat, 01 Nov 2008 04:00:00 +0100

This study evaluated the effects of the short-term use of a dentifrice containing nano-sized carbonate apatite (n-CAP) on the occlusion of the dentinal tubules using a scanning electron microscope (SEM) and an image analyser in vitro. One hundred human dentine specimens were wet ground with a silicone carbide papers and etched with 6% citric acid for 1 min to allow complete opening of the dentinal tubule. Specimens showing complete opening tubules were used as the baseline. The specimens were divided randomly into five groups: G1: 0% n-CAP, G2: 5% n-CAP, G3: 10% n-CAP, G4: 20% n-CAP and G5: 10%strontium chloride (SrCl(2)). Five specimens from each group were brushed by applying 50, 100, 250 and 500 strokes, respectively. All the specimens were evaluated by a SEM (x3000), and the degree of ...

Marginal fit of 14-unit zirconia fixed dental prosthesis retainers.

Journal of Oral Rehabilitation — Wed, 29 Oct 2008 04:00:00 +0100

Authors: Beuer F, Neumeier P, Naumann M The marginal fit of 14-unit fixed dental prosthesis retainers and single-crown copings fabricated by the same computer-aided design (CAD)/computer-aided manufacturing (CAM) system were evaluated in vitro hypothesizing that the marginal opening might be independent of the type of restoration. Eight ivorine maxillary teeth (FDI locations 27, 25, 23, 21, 11, 13, 15 and 17) were prepared to accommodate a 14-unit prosthesis. Ten fixed dental prosthesis retainers and 40 single-crown-copings were fabricated using Zeno CAD/CAM on 20 master dies. Four cross-sections were made from each tooth and the marginal gap dimensions were measured. One-way anova was used to test the difference between the experimental groups and two-way anova and a post hoc test (St...

Wear of human enamel and nano-filled composite resin denture teeth under different loading forces.

Journal of Oral Rehabilitation — Wed, 29 Oct 2008 04:00:00 +0100

Authors: Ghazal M, Kern M To evaluate and correlate the two-body wear of human enamel and nano-filled composite resin teeth with the loading forces used in a dual-axis chewing simulator. Three groups of human enamel and three of nano-filled composite resin teeth were tested in a chewing simulator. Zirconia ceramic balls were used as antagonists. The teeth were tested with three different loading forces (20, 49 and 78 N). Wear was analysed by measuring the volume and vertical substance loss using a laser scanner after 300000 chewing cycles. Data were statistically analysed using two-way anova followed by the Scheffé test (P </= 0.05). Spearman correlation test was used to determine whether there was a relationship between the loading force and the degree to which the human ename...

Impacts on daily performances attributed to malocclusions by British adolescents.

Journal of Oral Rehabilitation — Wed, 29 Oct 2008 04:00:00 +0100

Authors: Bernabé E, Sheiham A, de Oliveira CM The aim of this study was to assess the prevalence of condition-specific impacts on daily performances attributed to malocclusion in British adolescents. Two hundred 16- to 17-year-old adolescents were randomly selected from 957 children attending a public college in London, UK. During interviews, participants provided information about demographic variables and socio-dental impacts on quality of life attributed to malocclusions, using the Condition-Specific form of the Oral Impacts on Daily Performances (CS-OIDP) index. Adolescents were also clinically examined using the Index of Orthodontic Treatment Need. Statistical comparison by covariates was performed using chi-squared test and chi-squared test for trends. The prevalence of oral...

In vitro evaluation of the implant abutment connection sealing capability of different implant systems.

Journal of Oral Rehabilitation — Wed, 29 Oct 2008 04:00:00 +0100

This study sought to evaluate the sealing capability of the implant abutment connection of different dental implant systems. Five Nobel Replace select, Straumann and Intra-lock implants of approximately 4.5 mm diameter with their respective abutments were provided by the manufacturers. A calibration curve was determined by placing toluidine blue (TB) increments of 0.1 muL into 1.5 mL of distilled water and recording its absorbance in a spectrophotometer until reaching 0.7 muL. Then, 0.7 muL of TB was placed in the deepest portion of each implant's internal screw, the abutments were adapted to the implant according to the manufacturer's instructions and the specimens were placed in vials with 1.5 mL of distilled water. Spectrophotometric analysis was performed at 1, 3, 6, 24, 48, 72, 96 and...

Cytotoxicity of one-step dentin-bonding agents toward dental pulp and odontoblast-like cells.

Journal of Oral Rehabilitation — Wed, 29 Oct 2008 04:00:00 +0100

Authors: Yasuda Y, Inuyama H, Maeda H, Akamine A, Nör JE, Saito T The purpose of this study was to compare the cytotoxicity of five one-step dentin-bonding agents on human dental pulp and odontoblast-like cells (MDPC-23). Photopolymerized and unpolymerized samples of these dentin-bonding agents were prepared and incubated with dental pulp or MDPC-23 cells. After 24 or 72 h of incubation, the number of unstained cells with trypan blue was counted. The staining of cells with trypan blue stands for a cytotoxicity. The pulp cell and MDPC-23 cytotoxicity of polymerized sample treatment increased in the order of AQ Bond Plus (AQ)<Clearfil Tri-S Bond (TS)=G-bond (GB)<Absolute (AB)<Adper Prompt (AP) for 24 and 72 h. The pulp cell cytotoxicity of unpolymerized sample treatment for...

Effect of prolonged erosive pH cycling on different restorative materials.

Journal of Oral Rehabilitation — Wed, 29 Oct 2008 04:00:00 +0100

In conclusion, the prolonged pH cycling promoted significantly higher alterations (SMHC and erosive wear) on the glass-ionomer cements than the CR and amalgam. PMID: 18976266 [PubMed - as supplied by publisher] (Source: Journal of Oral Rehabilitation)

Results of a prospective randomized controlled trial of posterior ZrSiO-ceramic crowns.