MedWorm: Laser Surgery

Laser florence 2008

Lasers in Medical Science — Wed, 01 Oct 2008 09:21:47 +0100

Laser Florence 2008 Content Type Journal ArticleCategory AbstractsDOI 10.1007/s10103-008-0613-8 Journal Lasers in Medical ScienceOnline ISSN 1435-604XPrint ISSN 0268-8921 (Source: Lasers in Medical Science)

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Three-dimensional residue-free volume removal inside sapphire by high-temperature etching after irradiation of femtosecond laser pulses

Laser Chemistry — Tue, 30 Sep 2008 19:00:56 +0100

We applied the femtosecond laser-assisted etching technique, that is, irradiation of focused femtosecond laser pulses followed by selective chemical etching, to volume removal inside sapphire. At room temperature, volume etching only slightly advanced while residue remained inside the volume. By increasing the etching temperature, complete volume etching without residue was achieved. Complete etching was, however, accompanied by undesirable phenomena of surface pits or cracks, which are expected to be excluded through further improvement of processing. (Source: Laser Chemistry)

Expression of receptor activator of nuclear factor -κb ligand, receptor activator of nuclear factor -κb, and osteoprotegerin, following low-level laser treatment on deproteinized bovine bone graft in rats

Lasers in Medical Science — Tue, 30 Sep 2008 09:19:50 +0100

Abstract The aim of this study was to investigate by immunohistochemistry the effects of low-level laser (LLL) irradiation on the expression of the receptor activator of nuclear factor -κB ligand (RANKL), osteoprotegerin (OPG), and the receptor activator of nuclear factor -κB (RANK) in deproteinized bovine bone grafts in rats. Twenty-four male Sprague-Dawley rats aged 15 weeks were allocated to either an experimental group that underwent LLL irradiation during bone healing at the bone graft sites of the rats’ calvarial bone defects or a control group. In the experimental group, gallium–aluminum–arsenide (Ga-Al-As) diode LLL (wavelength 808 nm; output 96 mW) was used to irradiate three areas on and around bone defects. The radiation was administered by the contact method for 10 s at 8.3 J/cm2, once a day for 7 days. The total dose over the complete schedule was 40.32 J. The animals were killed on days 7, 14 or 21. The results of immunohistochemical analysis showed that the expression of RANKL (P = 0.199), OPG (P = 0.035), and RANK (P = 0.020) in the experimental group significantly increased from day 7, with a more even distribution than in the control group, and that this difference prevailed until the end of the experiment. Bone density of the experimental group after trichrome staining was also higher than in the control group. These results suggest that LLL irradiation facilitates bone metabolism during bone healing at the sites of deproteinized bovine bone grafts in rats. Content Type Journal ArticleCategory Original ArticleDOI 10.1007/s10103-008-0614-7Authors Yong-Deok Kim, Pusan National University Department of Oral and Maxillofacial Surgery, School of Dentistry Busan KoreaWon-Wook Song, Pusan National University Department of Oral and Maxillofacial Surgery, School of Dentistry Busan KoreaSeong-Sik Kim, Pusan National University Medical Research Institute Busan KoreaGyu-Cheon Kim, Pusan National University Department of Oral Anatomy, School of Dentistry Busan KoreaDae-Seok Hwang, Pusan National University Department of Oral and Maxillofacial Surgery, School of Dentistry Busan KoreaSang-Hun Shin, Pusan National University Department of Oral and Maxillofacial Surgery, School of Dentistry Busan KoreaUk-Kyu Kim, Pusan National University Department of Oral and Maxillofacial Surgery, School of Dentistry Busan KoreaJong-Ryoul Kim, Pusan National University Department of Oral and Maxillofacial Surgery, School of Dentistry Busan KoreaIn-Kyo Chung, Pusan National University Department of Oral and Maxillofacial Surgery, School of Dentistry Busan Korea Journal Lasers in Medical ScienceOnline ISSN 1435-604XPrint ISSN 0268-8921 (Source: Lasers in Medical Science)

Effect of 655-nm low-level laser therapy on exercise-induced skeletal muscle fatigue in humans

Photomedicine and Laser Surgery — Fri, 26 Sep 2008 03:08:06 +0100

Photomedicine and Laser Surgery , Vol. 0, No. 0: 1-6. Abstract Objective: To investigate if development of skeletal muscle fatigue during repeated voluntary biceps contractions could be attenuated by low-level laser therapy (LLLT). Background Data: Previous animal studies have indicated that LLLT can reduce ... (Source: Photomedicine and Laser Surgery)

Physical and spectroscopic properties of yb3+-doped fluorophosphate laser glasses

Laser Chemistry — Thu, 25 Sep 2008 18:27:35 +0100

The physical properties including refractive index, Abbe number, nonlinear refractive index, microhardness and thermal expansion coefficient, and spectroscopic properties of Yb3+-doped fluorophosphate laser glasses were investigated. The results show that due to the addition of fluoride, mechanical and thermal properties are promoted, emission cross-section σemi is also greatly enhanced. The largest gain coefficient σemi·τm (0.824 pm2·ms) can be obtained with the minimum pump intensity Imin (1.112 kw/cm2). This kind of Yb3+-doped fluorophosphate glass is an excellent candidate material for Yb3+-doped host for high-power generation. (Source: Laser Chemistry)

Induced bragg gratings in optical fibers and waveguides using an ultrafast infrared laser and a phase mask

Laser Chemistry — Sun, 21 Sep 2008 17:44:51 +0100

Since its development in 2003, the technique of Bragg grating inscription in optical fibers and waveguides with ultrafast infrared radiation and a phase mask has proven to be as simple as the standard UV-laser grating writing techniques but far more versatile. The ultrafast IR laser-based process allows for the creation of grating structures in glassy and crystalline materials that are not typically UV photosensitive. In this article, we will review the studies that have been performed at the Communications Research Centre Canada on the grating formation processes as well as applications of the ultrafast laser technique to fabricate gratings in various optical fibers and waveguides. (Source: Laser Chemistry)

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Ultrafast four-wave optical parametric amplification in transparent condensed bulk media

Laser Chemistry — Sun, 21 Sep 2008 17:44:51 +0100

We present a short overview of recent advances in ultrashort pulse four-wave optical parametric amplification in transparent condensed bulk media with Kerr nonlinearity. Highly efficient (10% to 15% pump-to-signal energy conversion) four-wave optical parametric amplification in water and fused silica is experimentally demonstrated. The amplification process highly benefits from 1-dimensional spatial soliton propagation regime, which sets in under proper combination of cylindrical beam focusing and noncollinear phase matching geometry with millijoule pumping. Under these operating conditions, strong four-wave coupling quenches catastrophic beam break-up and filamentation, and the setup operates reasonably below the damage threshold of the nonlinear medium. The proposed methodology offers a number of advantages as compared to guided-wave configurations in gaseous media. (Source: Laser Chemistry)

The effects of a 785-nm algainp laser on the regeneration of rat anterior tibialis muscle after surgically-induced injury

Photomedicine and Laser Surgery — Fri, 19 Sep 2008 03:02:59 +0100

Photomedicine and Laser Surgery , Vol. 0, No. 0: 1-6. Abstract Objective: This study aims to investigate the effects of low-level laser therapy (LLLT) on muscle regeneration. For this purpose, the anterior tibialis muscle of 48 male Wistar rats received AlGaInP laser treatment (785 nm) after surgically-... (Source: Photomedicine and Laser Surgery)

Effect of three different intensities of infrared laser energy on the levels of amino acid neurotransmitters in the cortex and hippocampus of rat brain

Photomedicine and Laser Surgery — Fri, 19 Sep 2008 01:05:10 +0100

Photomedicine and Laser Surgery , Vol. 0, No. 0: 1-10. Abstract Objective: The aim of this study is to investigate the effects of three different intensities of infrared diode laser radiation on amino acid neurotransmitters in the cortex and hippocampus of rat brain. Background Data: Lasers are known to ... (Source: Photomedicine and Laser Surgery)

Combining therapeutic laser and herbal remedy for treating ligament injury: an ultrastructural morphological study

Photomedicine and Laser Surgery — Fri, 19 Sep 2008 01:03:17 +0100

Photomedicine and Laser Surgery , Vol. 0, No. 0: 1-8. Abstract Objective: We examined the ultrastructural morphology (number of collagen fibrils, mean and mass-averaged diameter) of isolated and combined treatments of a therapeutic laser and herbs for medial collateral ligament (MCL) injury in rats. ... (Source: Photomedicine and Laser Surgery)

Histological results of sclerotherapy, phototherapy, and pulsed 980-nm laser irradiation of the dorsal rabbit ear vein

Photomedicine and Laser Surgery — Fri, 19 Sep 2008 01:01:46 +0100

Photomedicine and Laser Surgery , Vol. 0, No. 0: 1-5. Abstract Objective: To compare the histological changes occurring after three different treatment modalities for telangiectasias. Materials and Methods: Thirty 16-week-old New Zealand white rabbits weighing 2.4–3.1 kg were enrolled in the study. The ... (Source: Photomedicine and Laser Surgery)

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Shear bond strength of composite bonded to er,cr:ysgg laser-prepared dentin

Photomedicine and Laser Surgery — Fri, 19 Sep 2008 00:54:51 +0100

Photomedicine and Laser Surgery , Vol. 0, No. 0: 1-6. Abstract Objective: The purpose of this in vitro study was to evaluate dentin bond strength to resin composite following high-speed rotary or Er,Cr:YSGG laser preparation using two different adhesive systems. Materials and Methods: One hundred and forty ... (Source: Photomedicine and Laser Surgery)

Improvement in quality of life of an oncological patient by laser phototherapy: a case report

Photomedicine and Laser Surgery — Fri, 19 Sep 2008 00:53:14 +0100

Photomedicine and Laser Surgery , Vol. 0, No. 0: 1-4. Abstract Objective and Background Data: Common side effects of radiotherapy (RT) to the head and neck include oral mucositis, xerostomia, and severe pain. The aim of this study is to report improvement in the quality of life of an oncological patient by ... (Source: Photomedicine and Laser Surgery)

Autofluorescence of ovarian normal, benign, and malignant tissues: a pilot study

Photomedicine and Laser Surgery — Fri, 19 Sep 2008 00:51:21 +0100

Photomedicine and Laser Surgery , Vol. 0, No. 0: 1-11. Abstract Objective: The objective of this study is to evaluate the efficacy of laser-induced fluorescence (LIF) data obtained at 325-nm pulsed laser excitation for the discrimination of normal, benign, and malignant ovarian tissues. Background Data: ... (Source: Photomedicine and Laser Surgery)

Transmission electron microscopic examination of the interface between a resin-modified glass-ionomer and er:yag laser-irradiated dentin

Photomedicine and Laser Surgery — Fri, 19 Sep 2008 00:49:28 +0100

Photomedicine and Laser Surgery , Vol. 0, No. 0: 1-7. Abstract Objective: The aim of this study was to analyze the ultrastructural characteristics of the interface between a resin-modified glass ionomer (RMGI) and Er:YAG laser-irradiated dentin. Background Data: The Er:YAG laser has been considered as a ... (Source: Photomedicine and Laser Surgery)

Low-intensity pulsed laser irradiation affects rankl and opg mrna expression in rat calvarial cells

Photomedicine and Laser Surgery — Fri, 19 Sep 2008 00:47:11 +0100

Photomedicine and Laser Surgery , Vol. 0, No. 0: 1-7. Abstract Objective: This study aimed to investigate the effect of low-intensity pulsed laser (LIPL; 650 nm, 2 mW) irradiation on mRNA expression of receptor activator of NF-κB ligand (RANKL) and osteoprotegerin (OPG) in rat calvarial cells. Materials and ... (Source: Photomedicine and Laser Surgery)

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Er:yag laser cavity preparation and semi-direct composite resin restoration: a microleakage study

Photomedicine and Laser Surgery — Fri, 19 Sep 2008 00:45:18 +0100

Photomedicine and Laser Surgery , Vol. 0, No. 0: 1-5. Abstract Objective: This study was performed to assess the microleakage of composite resin restorations bonded in Er:YAG laser–prepared cavities using a semi-direct technique, in comparison with diamond bur–prepared cavities. Background Data: Previous in ... (Source: Photomedicine and Laser Surgery)

The effects of low-level light emitting diode on the repair process of achilles tendon therapy in rats

Lasers in Medical Science — Tue, 16 Sep 2008 09:35:50 +0100

Abstract Thirty Wistar rats (350 ± 20 g) were subjected to total Achilles tendon tenotomy of the right fore limb. They were submitted to a daily dose of 20 J/cm2 light emitting diode (LED) (640 ± 20 nm) therapy. The LED was applied punctually and transcutaneously to the lesioned region. The animals were separated into six groups, C1 and L1, C2 and L2, C3 and L3. The C groups were used for control and the L groups, treated for 7, 14 and 21 consecutive days, respectively. The animals were killed on the 7th, 14th and 21st days after surgery. After the animals had been killed, their tendons were extracted and dissected, fixed in formaldehyde at 10%, and sent for histological analysis by light microscopy in which the repair process was analysed. This study demonstrated that LED interfered in the repair process of the tendon tissue, reducing the number of fibroblasts in the initial periods and improving the quality of the repair in all periods studied. Content Type Journal ArticleCategory Brief ReportDOI 10.1007/s10103-008-0607-6Authors Heliodora L. Casalechi, Universidade do Vale do Paraíba Instituto de Pesquisa e Desenvolvimento Avenida Shishima Hifumi, 2911, Urbanova São José dos Campos São Paulo BrasilRenata A. Nicolau, Universidade do Vale do Paraíba Instituto de Pesquisa e Desenvolvimento Avenida Shishima Hifumi, 2911, Urbanova São José dos Campos São Paulo BrasilVitor L. Casalechi, Universidade do Vale do Paraíba Instituto de Pesquisa e Desenvolvimento Avenida Shishima Hifumi, 2911, Urbanova São José dos Campos São Paulo BrasilLandulfo Silveira, Universidade do Vale do Paraíba Instituto de Pesquisa e Desenvolvimento Avenida Shishima Hifumi, 2911, Urbanova São José dos Campos São Paulo BrasilAlfredo M. B. De Paula, Universidade Estadual de Montes Claros Laboratório de Pesquisa em Saúde, Hospital Universitário Clemente de Faria Montes Claros Minas Gerais BrasilMarcos T. T. Pacheco, Universidade do Vale do Paraíba Instituto de Pesquisa e Desenvolvimento Avenida Shishima Hifumi, 2911, Urbanova São José dos Campos São Paulo Brasil Journal Lasers in Medical ScienceOnline ISSN 1435-604XPrint ISSN 0268-8921 (Source: Lasers in Medical Science)

Study of autonomic nervous activity of night shift workers treated with laser acupuncture

Photomedicine and Laser Surgery — Fri, 12 Sep 2008 11:39:52 +0100

Photomedicine and Laser Surgery , Vol. 0, No. 0: 1-7. Abstract Objective: The aim of this study was to evaluate the impact of laser acupuncture on the autonomic nervous system (ANS) of the night shift worker. Background Data: Many articles have demonstrated that levels of affective disorders and stress are ... (Source: Photomedicine and Laser Surgery)

Morphometric and histological analysis of low-power laser influence on bone morphogenetic protein in bone defects repair

Lasers in Medical Science — Fri, 12 Sep 2008 06:55:54 +0100

Abstract Bone morphogenetic proteins (BMPs) are secreted signaling molecules belonging to the transforming growth factor-β (TGF-β) superfamily. The objective of this study was to determine how gallium–aluminum–arsenium (GaAlAs) 650 nm laser influenced the action of BMPs on bone defects created in rat femurs. The sample consisted of 24 male albino Wistar rats. Group 1 was composed of rats with bone defects filled with bone-inducing substance, with the application of low-power laser. Group 2 contained rats with bone defects filled with a bone-inducing substance, without the application of low-power laser. Group 3 rats had bone defects not filled with a bone-inducing substance, with the application of low-power laser. Group 4 rats had bone defects and no treatment (control group). A bone defect was produced with drills. In groups 1 and 2 the defects were filled with a bone-inducing substance. The animals were treated with GaAlAs (50 mW) laser, energy density 4J/cm2, for 80 ss on a 1 cm2 area. Groups 2 and 4 were used as control. Bone samples were removed for histological procedures and morphometric analysis on the 7th, 14th and 21st days after surgery. Results obtained were subjected to statistical analysis. Rejection level for the null hypothesis was 0.05. Statistical differences were found in the comparison between group 1 (G1), G2, G3 and G4 [analysis of variance (ANOVA); P < 0.0134]. There was a statistically significant correlation between groups 1 and 4 (P < 0.01). The results of other correlations by Tukey’s post-hoc test were: group 1 vs group 3 (P = 0.341), group 1 vs group 2 (P = 0.862), group 2 vs group 4 (P = 0.061), group 2 vs group 3 (P = 0.744), and group 3 vs group 4 (P = 0.249). We concluded that the association of low-power laser with a bone-inducing substance produced better results than when low-power laser or BMPs were used alone. Content Type Journal ArticleCategory Original ArticleDOI 10.1007/s10103-008-0595-6Authors Amanda Silveira Denadai, Federal University of Mato Grosso do Sul Postgraduate Program on Health and Development in West Central Region Campo Grande Mato Grosso do Sul BrazilPaulo de Tarso Camillo de Carvalho, Federal University of Mato Grosso do Sul Postgraduate Program on Health and Development in West Central Region Campo Grande Mato Grosso do Sul BrazilFilipe Abdalla dos Reis, University for the Development of the State and Pantanal Region (UNIDERP) Department of Physiotherapy Campo Grande Mato Grosso do Sul BrazilAna Carulina Guimarães Belchior, University for the Development of the State and Pantanal Region (UNIDERP) Department of Physiotherapy Campo Grande Mato Grosso do Sul BrazilDaniel Martins Pereira, University for the Development of the State and Pantanal Region (UNIDERP) Department of Physiotherapy Campo Grande Mato Grosso do Sul BrazilDoroty Mesquita Dourado, University for the Development of the State and Pantanal Region (UNIDERP) Department of Physiotherapy Campo Grande Mato Grosso do Sul BrazilIandara S. Silva, Federal University of Mato Grosso do Sul Postgraduate Program on Health and Development in West Central Region Campo Grande Mato Grosso do Sul BrazilLuis Vicente Franco de Oliveira, Nove de Julho University (UNINOVE) Rehabilitation Sciences Master’s Program São Paulo São Paulo Brazil Journal Lasers in Medical ScienceOnline ISSN 1435-604XPrint ISSN 0268-8921 (Source: Lasers in Medical Science)

The effect of low-level laser irradiation on dog spermatozoa motility is dependent on laser output power

Lasers in Medical Science — Fri, 12 Sep 2008 06:55:54 +0100

Abstract Biological tissues respond to low-level laser irradiation and so do dog spermatozoa. Among the main parameters to be considered when a biological tissue is irradiated is the output power. We have studied the effects on sperm motility of 655 nm continuous wave diode laser irradiation at different output powers with 3.34 J (5.97 J/cm2). The second fraction of fresh dog sperm was divided into five groups: control, and four to be irradiated with an average output power of 6.8 mW, 15.4 mW, 33.1 mW and 49.7 mW, respectively. At 0 min and 45 min after irradiation, pictures were taken and a computer aided sperm analysis (CASA) performed to analyse different motility parameters. The results showed that different output powers affected dog semen motility parameters differently. The highest output power showed the most intense effects. Significant changes in the structure of the motile sperm subpopulation were linked to the different output powers used. Content Type Journal ArticleCategory Original ArticleDOI 10.1007/s10103-008-0606-7Authors M. I. Corral-Baqués, Rovira i Virgili University Post-Degree Laser Medical Study Reus SpainM. M. Rivera, Autonomous University of Barcelona Animal Reproduction Unit, Faculty of Veterinary Medicine Bellaterra SpainT. Rigau, Autonomous University of Barcelona Animal Reproduction Unit, Faculty of Veterinary Medicine Bellaterra SpainJ. E. Rodríguez-Gil, Autonomous University of Barcelona Animal Reproduction Unit, Faculty of Veterinary Medicine Bellaterra SpainJ. Rigau, Rovira i Virgili University Post-Degree Laser Medical Study Reus Spain Journal Lasers in Medical ScienceOnline ISSN 1435-604XPrint ISSN 0268-8921 (Source: Lasers in Medical Science)

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In vitro evaluation of erbium, chromium:yttrium–scandium–gallium–garnet laser-treated enamel demineralization

Lasers in Medical Science — Fri, 12 Sep 2008 06:55:53 +0100

Abstract This study evaluated the effect of different parameters of erbium, chromium:yttrium–scandium–gallium–garnet (Er,Cr:YSGG) laser irradiation on enamel mineral loss in a simulated caries model. Forty-five enamel samples obtained from third molar teeth (3 mm× 3 mm) were randomly divided into five groups (n = 9): G1—Er,Cr:YSGG laser at 0.25 W, 20 Hz, 2.8 J/cm2; G2—Er,Cr:YSGG laser at 0.50 W, 20 Hz, 5.7 J/cm2; G3—Er,Cr:YSGG laser at 0.75 W, 20 Hz, 8.5 J/cm2; G4—sodium fluoride (NaF) dentifrice (positive control); G5—no treatment (negative control). After irradiation, the samples were submitted to 2 weeks of pH cycling. After the acid challenge, the samples were assessed by cross-sectional microhardness at different depths from the enamel surface. Analysis of variance (ANOVA) and Student–Newman–Keuls tests were performed (α = 5%). The percentage of lesion inhibition for each group was: G1 37%; G2 38%; G3 64%, and G4 50.5%. Regarding the relative mineral loss values (micrometers × volume percent), groups G1 (1,392 ± 522) and G2 (1,292 ± 657) did not differ significantly from each other, but both had higher values than group G3 (753 ± 287); the groups irradiated with Er,Cr:YSGG laser did not differ from group G4. Although the findings of the study revealed that Er,Cr:YSGG laser irradiation at 8.5 J/cm2 can be an alternative for the enhancement of the enamel’s resistance to acid, lower energy densities also produced a cariostatic potential comparable to the use of fluoride dentifrice. Content Type Journal ArticleCategory Original ArticleDOI 10.1007/s10103-008-0597-4Authors Patrícia M. de Freitas, University of São Paulo (USP) Department of Restorative Dentistry, School of Dentistry Prof. Lineu Prestes, 2227, Cidade Universitária, Butantã São Paulo SP 05508–900 BrazilMarcia Rapozo-Hilo, University of California at San Francisco (UCSF) Department of Preventive and Restorative Dental Sciences San Francisco CA USACarlos de P. Eduardo, University of São Paulo (USP) Department of Restorative Dentistry, School of Dentistry Prof. Lineu Prestes, 2227, Cidade Universitária, Butantã São Paulo SP 05508–900 BrazilJohn D. B Featherstone, University of California at San Francisco (UCSF) Department of Preventive and Restorative Dental Sciences San Francisco CA USA Journal Lasers in Medical ScienceOnline ISSN 1435-604XPrint ISSN 0268-8921 (Source: Lasers in Medical Science)

Clinical and radiographic investigation of the adjunctive effects of a low-power he-ne laser in the treatment of moderate to advanced periodontal disease: a pilot study

Photomedicine and Laser Surgery — Thu, 11 Sep 2008 14:15:40 +0100

Photomedicine and Laser Surgery , Vol. 0, No. 0: 1-7. Abstract Objective: To evaluate the adjunctive effect of a low-power He-Ne laser in the non-surgical periodontal treatment of patients with moderate to advanced chronic periodontitis. Background Data: Laser applications in dental treatment are now more ... (Source: Photomedicine and Laser Surgery)

Effect of low-level laser therapy on mast cells in viability of the transverse rectus abdominis musculocutaneous flap

Photomedicine and Laser Surgery — Thu, 11 Sep 2008 14:15:36 +0100

Photomedicine and Laser Surgery , Vol. 0, No. 0: 1-7. Abstract Objective: To assess the effect of low-level laser therapy (LLLT) on viability of mast cells of the transverse rectus abdominis musculocutaneous (TRAM) flap. Background Data: LLLT has been recently used on the TRAM flap to stimulate mast cells. ... (Source: Photomedicine and Laser Surgery)

5-aminolevulinic acid–mediated photodynamic therapy of human endometriotic primary epithelial cells

Photomedicine and Laser Surgery — Thu, 11 Sep 2008 14:15:35 +0100

Photomedicine and Laser Surgery , Vol. 0, No. 0: 1-7. Abstract Objective: Despite progress in medicine, appropriate diagnosis and treatment of endometriosis poses a serious problem. For this reason, in in-vitro experiments were performed on a potential method of employing photodynamic therapy (PDT) of ... (Source: Photomedicine and Laser Surgery)

Generation of effective vaccines against liver cancer by using photodynamic therapy

Lasers in Medical Science — Tue, 09 Sep 2008 08:28:54 +0100

Abstract Preclinical studies have shown that photodynamic therapy (PDT) enhances immune responses. To examine the role of the direct effects of PDT in liver cancer with regard to enhancement of the antitumor response, we injected PDT-generated H22 liver cancer cell lysate (as a tumor vaccine) intradermally into Kunming mice. In the control group, the cell lysate was substituted with normal saline solution. A liver tumor model was established by the injection of H22 cell suspension. We found that the PDT-generated vaccine significantly increased the percentages of CD4+, CD8+, and CD19+ cells, inhibited tumor growth, and prolonged the survival time. Our findings suggest that PDT-generated vaccines can significantly enhance the antitumor immune response and may have the potential to be used as an adjuvant therapy clinically. Content Type Journal ArticleCategory Original ArticleDOI 10.1007/s10103-008-0609-4Authors Hongyu Zhang, Laser Medicine Laboratory of Tianjin Medical University 300070 Tianjin People’s Republic of ChinaWenjiang Ma, Clinical Laboratory of Tianjin Medical University Eye Centre Tianjin People’s Republic of ChinaYingxin Li, Laser Medicine Laboratory of Tianjin Medical University 300070 Tianjin People’s Republic of China Journal Lasers in Medical ScienceOnline ISSN 1435-604XPrint ISSN 0268-8921 (Source: Lasers in Medical Science)

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Catheters: instrumental advancements in biomedical applications of optical fibers

Lasers in Medical Science — Tue, 09 Sep 2008 08:28:53 +0100

Abstract This review is focused on the advancements in biomedical engineering regarding the elaboration of new prototypes of optical fiber catheters to be applied in spectroscopic analysis, such as Raman and fluorescence spectroscopy. Our group has contributed to the development of new prototypes with interesting properties, such as side-viewing signal excitation and collection, distal tip with bending control, and Raman scattering minimization from the optical fiber. In addition, several groups have contributed to other new catheter-improving properties of this spectroscopic device. However, a relatively small number of studies has been published in the literature, due to industrial interest in this interdisciplinary and multidisciplinary area. To our knowledge, no review that has focused on the applications of catheters to several modes of spectroscopy has been published. In this work we revised this topic, analyzing the advancements and limitations of the recent biomedical catheters. Content Type Journal ArticleCategory Review ArticleDOI 10.1007/s10103-008-0608-5Authors Carlos J. de Lima, Universidade do Vale do Paraíba Instituto de Pesquisa e Desenvolvimento Av. Shishima Hifumi, 2911, Bairro Urbanova São José dos Campos São Paulo 12244-000 BrazilLeonardo M. Moreira, Universidade do Vale do Paraíba Instituto de Pesquisa e Desenvolvimento Av. Shishima Hifumi, 2911, Bairro Urbanova São José dos Campos São Paulo 12244-000 BrazilJuliana P. Lyon, Universidade do Vale do Paraíba Instituto de Pesquisa e Desenvolvimento Av. Shishima Hifumi, 2911, Bairro Urbanova São José dos Campos São Paulo 12244-000 BrazilAntonio B. Villaverde, Universidade do Vale do Paraíba Instituto de Pesquisa e Desenvolvimento Av. Shishima Hifumi, 2911, Bairro Urbanova São José dos Campos São Paulo 12244-000 BrazilMarcos T. T. Pacheco, Universidade do Vale do Paraíba Instituto de Pesquisa e Desenvolvimento Av. Shishima Hifumi, 2911, Bairro Urbanova São José dos Campos São Paulo 12244-000 Brazil Journal Lasers in Medical ScienceOnline ISSN 1435-604XPrint ISSN 0268-8921 (Source: Lasers in Medical Science)

Effects of acupuncture at the hoku acupoint on the pulsatile laser doppler signal at the heartbeat frequency

Lasers in Medical Science — Tue, 09 Sep 2008 08:28:50 +0100

Abstract We aimed to assess the effects of acupuncture by analyzing the alternating current (AC) component of skin blood-flow signals (around the heartbeat frequency) simultaneously recorded at the Hoku acupoint, which is an important acupoint in oriental medicine, and two nearby non-acupoints following acupuncture stimulation (AS). Laser Doppler flowmetry signals were measured in 28 experiments on nine volunteers. Each experiment involved the recording of a 20-min control-data sequence and two sets of effects data recorded 0–20 min and 50–70 min after the AS had been stopped. The direct current (DC) and AC components (DCflux and ACflux, respectively), pulse width (PW), and foot delay time (FDT) of the flux signal were calculated. The DCflux, ACflux, PW, and FDT were all significantly increased only at Hoku following AS. Regression analysis between the DCflux and ACflux revealed that the slope was largest (>1) at Hoku among the measurement sites. Our results indicated that both the DCflux and ACflux in the microcirculatory perfusion were increased by stimulation at the Hoku acupoint, with the change being greatest for the latter. Parameters calculated from the pulsatile flux waveform, such as the PW and FDT, could contribute to noninvasive evaluations of the sympathetic neural activities and of the improvement in perfusion following AS. Content Type Journal ArticleCategory Original ArticleDOI 10.1007/s10103-008-0610-yAuthors Hsin Hsiu, Yuan Ze University Department of Electrical Engineering 135 Yuan-Tung Road Taoyuan Taiwan Republic of ChinaWei-Chen Hsu, Taipei City Hospital, RenAi Branch Taipei Taiwan Republic of ChinaChia-Liang Hsu, Yuan Ze University Department of Electrical Engineering 135 Yuan-Tung Road Taoyuan Taiwan Republic of ChinaMing-Yie Jan, Institute of Physics, Academia Sinica Biophysics Laboratory Taipei Taiwan Republic of ChinaYuh-Ying Wang-Lin, Institute of Physics, Academia Sinica Biophysics Laboratory Taipei Taiwan Republic of China Journal Lasers in Medical ScienceOnline ISSN 1435-604XPrint ISSN 0268-8921 (Source: Lasers in Medical Science)

Evaluation of low-level laser therapy of osteoblastic cells

Photomedicine and Laser Surgery — Thu, 28 Aug 2008 15:12:39 +0100

Photomedicine and Laser Surgery Aug 2008, Vol. 26, No. 4: 401-404. Abstract Objective: The purpose of the present study was to evaluate the effect of biomodulation on osteoblastic cells using a gallium-aluminium-arsenide diode laser. Background Data: Low-level laser therapy (LLLT) is a non-pharmacological therapeutic ... (Source: Photomedicine and Laser Surgery)

Editorial: working with the evidence

Photomedicine and Laser Surgery — Thu, 28 Aug 2008 15:10:17 +0100

Photomedicine and Laser Surgery Aug 2008, Vol. 26, No. 4: 279-280. (Source: Photomedicine and Laser Surgery)

Photomedicine and lllt literature watch

Photomedicine and Laser Surgery — Thu, 28 Aug 2008 15:08:46 +0100

Photomedicine and Laser Surgery Aug 2008, Vol. 26, No. 4: 409-409. (Source: Photomedicine and Laser Surgery)

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Calendar of laser courses and meetings

Photomedicine and Laser Surgery — Thu, 28 Aug 2008 15:08:11 +0100

Photomedicine and Laser Surgery Aug 2008, Vol. 26, No. 4: 407-407. (Source: Photomedicine and Laser Surgery)

Low-level laser therapy in the prevention and treatment of chemotherapy-induced oral mucositis in young patients

Photomedicine and Laser Surgery — Thu, 28 Aug 2008 15:07:35 +0100

Photomedicine and Laser Surgery Aug 2008, Vol. 26, No. 4: 393-400. Abstract Objective: A pilot clinical study was conducted to evaluate the efficacy and feasibility of low-level laser therapy (LLLT) in the prevention and treatment of chemotherapy (CT)-induced oral mucositis (OM) in young patients. Background Data: ... (Source: Photomedicine and Laser Surgery)

Ktp green laser vaporization of biologic tissue under water and its clinical application

Photomedicine and Laser Surgery — Thu, 28 Aug 2008 15:07:15 +0100

Photomedicine and Laser Surgery Aug 2008, Vol. 26, No. 4: 337-341. Abstract Objectives: This study aimed to assess the effect of various power settings of the potassium-titanyl-phosphate (KTP) green laser on the vaporization of biological tissue under water and its potential and feasibility to treat patients with benign ... (Source: Photomedicine and Laser Surgery)

Bmla abstracts

Lasers in Medical Science — Wed, 27 Aug 2008 15:42:54 +0100

BMLA Abstracts Content Type Journal ArticleCategory AbstractsDOI 10.1007/s10103-008-0605-8 Journal Lasers in Medical ScienceOnline ISSN 1435-604XPrint ISSN 0268-8921 (Source: Lasers in Medical Science)

A feasibility study on laser rapid forming of a complete titanium denture base plate

Lasers in Medical Science — Thu, 21 Aug 2008 09:23:45 +0100

Abstract This work attempted to integrate the technologies of computer-aided design and computer-aided manufacture (CAD/CAM) and laser rapid forming (LRF) for the fabrication of the titanium plate of a complete denture. By the combination of laser scan and reverse engineering software, the standard triangulation language (STL)-formatted denture base plate was finally designed and sliced into a sequence of numerical controlled codes. The titanium (Ti) complete denture plate was finally built, layer-by-layer, on the LRF system. To evaluate the quality of fit, a virtual adaptation test that measured and compared the profiles of the laser free formed denture plate and those of the edentulous plaster cast had been conducted, and the mean deviation was found to be 0.34 mm. After traditional dental finishing techniques, a complete denture with a Ti base plate was then made and judged to be acceptable. The CAD/CAM/LRF system is a potential candidate and a new platform for the design and manufacture of custom-made Ti denture plates and restorations. Content Type Journal ArticleCategory Original ArticleDOI 10.1007/s10103-008-0603-xAuthors Jiang Wu, The Fourth Military Medical University Department of Prosthodontics, School of Stomatology 145 Changlexi Street Xi’an 710032 ChinaBo Gao, The Fourth Military Medical University Department of Prosthodontics, School of Stomatology 145 Changlexi Street Xi’an 710032 ChinaHua Tan, Northwestern Polytechnical University State Key Laboratory of Solidification Processing Xi’an ChinaJing Chen, Northwestern Polytechnical University State Key Laboratory of Solidification Processing Xi’an ChinaChak-yin Tang, The Hong Kong Polytechnic University, Hung Hom Department of Industrial and Systems Engineering Kowloon Hong Kong ChinaChi-pong Tsui, The Hong Kong Polytechnic University, Hung Hom Department of Industrial and Systems Engineering Kowloon Hong Kong China Journal Lasers in Medical ScienceOnline ISSN 1435-604XPrint ISSN 0268-8921 (Source: Lasers in Medical Science)

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Effect of equal daily doses achieved by different power densities of low-level laser therapy at 635 nm on open skin wound healing in normal and corticosteroid-treated rats

Lasers in Medical Science — Thu, 21 Aug 2008 09:23:43 +0100

Abstract Optimal parameters of low-level laser therapy (LLLT) for wound healing are still discussed. Hence, our study was aimed to compare effects of different power densities of LLLT at 635 nm in rats. Four, round, full-thickness, skin wounds were made on the backs of 48 rats that were divided into two groups (non-steroid laser-treated and steroid laser-treated). Three wounds were stimulated daily with a diode laser (daily dose 5 J/cm2) each with different power density (1 mW/cm2, 5 mW/cm2, and 15 mW/cm2), whereas the fourth wound served as a control. Two days, 6 days, and 14 days after surgery, eight animals from each group were killed and samples were removed for histological evaluation. In the non-steroid laser-treated rats, significant acceleration of epithelization and collagen synthesis 2 days and 6 days after surgery was observed in stimulated wounds. In steroid laser-treated rats, 2 days and 14 days after surgery, a decreased leucocyte/macrophage ratio and a reduction in the area of granulation tissue were recorded, respectively. In conclusion, LLLT, by the method we used, improved wound healing in the non-steroid laser-treated rats, but it was useless after corticosteroid treatment. Content Type Journal ArticleCategory Original ArticleDOI 10.1007/s10103-008-0604-9Authors Peter Gál, Pavol Jozef Šafárik University Department of Medical Biophysics Trieda SNP 1 040 11 Košice Slovak RepublicMichal Mokrý, Pavol Jozef Šafárik University Department of Medical Biophysics Trieda SNP 1 040 11 Košice Slovak RepublicBoris Vidinský, Pavol Jozef Šafárik University Department of Medical Biophysics Trieda SNP 1 040 11 Košice Slovak RepublicRóbert Kilík, Pavol Jozef Šafárik University and Louise Pasteur Faculty Hospital 1st Department of Surgery Košice Slovak RepublicFilip Depta, Pavol Jozef Šafárik University Department of Medical Biophysics Trieda SNP 1 040 11 Košice Slovak RepublicMagdaléna Harakaľová, Pavol Jozef Šafárik University Department of Medical Biophysics Trieda SNP 1 040 11 Košice Slovak RepublicFrantišek Longauer, Pavol Jozef Šafárik University Department of Forensic Medicine Košice Slovak RepublicŠtefan Mozeš, Slovak Academy of Sciences Institute of Animal Physiology Košice Slovak RepublicJán Sabo, Pavol Jozef Šafárik University Department of Medical Biophysics Trieda SNP 1 040 11 Košice Slovak Republic Journal Lasers in Medical ScienceOnline ISSN 1435-604XPrint ISSN 0268-8921 (Source: Lasers in Medical Science)

Microleakage of glass ionomer formulations after erbium:yttrium–aluminium–garnet laser preparation

Lasers in Medical Science — Thu, 21 Aug 2008 09:23:43 +0100

Abstract The aim of this study was to investigate the microleakage in class V cavities restored with four conventionally setting glass ionomers (CGIs) and one resin-modified glass ionomer (RMGI) following erbium:yttrium–aluminium–garnet (Er:YAG) laser or conventional preparation. Four hundred class V cavities were assigned to four groups: A and B were prepared by an Er:YAG laser; C and D were conventionally prepared. In groups B and D, the surface was additionally conditioned with Ketac conditioner. Each group was divided into five subgroups according to the glass ionomer cement (GIC) used: groups 1 (Ketac Fil), 2 (Ketac Molar), 3 (Ionofil Molar), 4 (Ionofil Molar Quick) and 5 (Photac Fil Quick). After thermocycling, a 2% methylene blue solution was used as dye. Scanning electron microscope (SEM) photographs were taken to show the conditioner’s effect. Complete marginal sealing could not be reached. PhotacFil showed less microleakage than the conventionally setting glass ionomer cements (CGICs) investigated. Conditioning laser-prepared cavities did not negatively influence microleakage results except for Ionofil Molar Quick. Content Type Journal ArticleCategory Original ArticleDOI 10.1007/s10103-008-0598-3Authors Katleen I. M. Delmé, Ghent University Department of Operative Dentistry and Endodontology, Ghent Dental Laser Center, Dental School, Ghent University Hospital De Pintelaan 185/P8 9000 Gent BelgiumPeter J. Deman, Rink 26 Sint-Pieters-Leeuw BelgiumMieke A. A. De Bruyne, Ghent University Department of Operative Dentistry and Endodontology, Ghent Dental Laser Center, Dental School, Ghent University Hospital De Pintelaan 185/P8 9000 Gent BelgiumSamir Nammour, University of Liège Department of Dental Sciences, Faculty of Medicine Liège BelgiumRoeland J. G. De Moor, Ghent University Department of Operative Dentistry and Endodontology, Ghent Dental Laser Center, Dental School, Ghent University Hospital De Pintelaan 185/P8 9000 Gent Belgium Journal Lasers in Medical ScienceOnline ISSN 1435-604XPrint ISSN 0268-8921 (Source: Lasers in Medical Science)

Adhesives bonded to erbium:yttrium–aluminum–garnet laser-irradiated dentin: transmission electron microscopy, scanning electron microscopy and tensile bond strength analyses

Lasers in Medical Science — Thu, 21 Aug 2008 09:23:43 +0100

Abstract The aim of this in vitro study was to investigate the effect of erbium:yttrium–aluminum–garnet (Er:YAG) laser irradiation on dentinal collagen by transmission electron microscopy and to analyze the resin–dentin interface by scanning electron microscopy. A tensile bond strength test was also applied. Specimens from 69 sound human third molars were randomly divided into three groups: control (no laser), and two irradiated groups, laser 250 (250 mJ/2 Hz) and laser 400 (400 mJ/4 Hz). Then, specimens were restored with two adhesive systems, an etch-and-rinse or a self-etch system. Although ultrastructural examination showed a modified surface in the irradiated dentin, there was no statistical difference in bond strength values between the laser groups and controls (P < 0.05). In conclusion, the use of Er:YAG laser for ablating human dentin did not alter the main adhesion parameters when compared with those obtained by conventional methods, thus reinforcing its use in restorative dentistry. Content Type Journal ArticleCategory Original ArticleDOI 10.1007/s10103-008-0600-0Authors Andreia Cristina Bastos Ramos, University of Fortaleza School of Dentistry Fortaleza CE BrazilMarcella Esteves-Oliveira, University of São Paulo Special Laboratory of Lasers in Dentistry, Department of Restorative Dentistry, School of Dentistry 05508-900 São Paulo SP BrazilVictor E. Arana-Chavez, University of São Paulo Laboratory of Mineralized Tissue Biology, Department of Cell and Developmental Biology, Institute of Biomedical Sciences 05508-900 São Paulo SP BrazilCarlos de Paula Eduardo, University of São Paulo Special Laboratory of Lasers in Dentistry, Department of Restorative Dentistry, School of Dentistry 05508-900 São Paulo SP Brazil Journal Lasers in Medical ScienceOnline ISSN 1435-604XPrint ISSN 0268-8921 (Source: Lasers in Medical Science)

A clinical comparison of topical piroxicam and emla cream for pain relief and inflammation in laser hair removal

Lasers in Medical Science — Thu, 21 Aug 2008 09:23:40 +0100

Abstract The aim of this study was to compare the efficacy of topical piroxicam and EMLA cream on pain control and subsequent inflammation in neodymium:yttrium–aluminum–garnet (Nd:YAG) 1,064 nm laser hair removal in female volunteers. Fifty female volunteers were enrolled in this prospective, randomized, double-blind, clinical study over a 6-month period. Patients were randomly assigned to receive topical piroxicam as group Piroxicam or EMLA cream as group EMLA. Topical analgesics were applied to the treatment sites for 60 min. The pain scores [on a visual analog scale (VAS)] and side effects were recorded before the hair removal, during the hair removal, at the end of the hair removal, and 1 h, 2 h and 24 h after the hair removal. Patients’ characteristics and the treatment settings of the Nd:YAG 1,064 nm laser were similar in the two groups. The pain scores (VAS) were similar, and satisfaction was high in both groups after the hair removal. The number of blanching and erythema episodes were significantly higher in group E than in group P (P < 0.001). Inflammatory side effects were less frequent in group P than in group E after the procedure (P < 0.001). This study showed that topical piroxicam and EMLA provided adequate and similar pain relief after Nd:YAG 1,064 nm laser hair removal in female volunteers. Topical piroxicam was associated with fewer inflammatory side effects than was EMLA cream, because of its anti-inflammatory effect after the procedure. Content Type Journal ArticleCategory Original ArticleDOI 10.1007/s10103-008-0599-2Authors Semra Akinturk, Bahat Hospital Department of Dermatology Istanbul TurkeyAhmet Eroglu, Karadeniz Technical University Department of Anesthesiology, Faculty of Medicine 61080 Trabzon Turkey Journal Lasers in Medical ScienceOnline ISSN 1435-604XPrint ISSN 0268-8921 (Source: Lasers in Medical Science)

Thermalization in infrared multiple photon induced reactions. the pressure dependence of the trans → cis isomerization of crotonitrile

Laser Chemistry — Sun, 17 Aug 2008 17:41:16 +0100

The infrared multiple photon trans → cis isomerization of crotonitrile was studied over the pressure range 0.02 torr to 10 torr at fluences of approximately 4J/cm2 using collimated TEA CO2 laser radiation at 942 cm-1. Only minor quantifies of fragmentation products were found at these conditions. At pressures of 0.1 torr or less, the trans form was completely converted to cis form by about 5000 laser pulses. On increasing the pressure a collisional regime was entered in which photostationary states were reached with fewer pulses and having smaller conversions than at low pressure. Both the number of pulses and the conversion decreased monotonically with increasing pressure. The tactic of driving the reaction in the exothermic direction gave evidence that the reaction does not occur solely by thermal isomedzation even in the highly eollisional 10 torr experiments, but that it still has a nonthermal component due to laser induced isomerization. (Source: Laser Chemistry)

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Pulsed co2-laser excitation of 03/02 mixtures at pressures from 0.16 to 1.20 bar

Laser Chemistry — Sun, 17 Aug 2008 17:41:16 +0100

An investigation is presented of the transient vibrational excitation of O3 in the collision dominated regime initiated by pulsed CO2-laser radiation. IR-UV-double resonance experiments and measurements of the absorbance for the CO2-laser lines 9P18, 20, and 22 were carried out. Mixtures of O3 (p=17 mbar) with 02 were investigated at pressures of 160 mbar ≤Pmixt≤1200 mbar and laser fluences of 0.10 J/cm2≤Fin< 2 J/cm2 . The results are interpreted by numerical simulations in terms of a comprehensive excitation/relaxation model based upon SSH-theory. Concerning the evolution of the excitation, simulated transients of the UV-absorbance compare well with the corresponding observed signals. The saturation of the absorbing O3-transitions is demonstrated by the measured fluence dependence of the absorption coefficient at the laser wavelengths. The extent of the 03-excitation can be deduced according to the model from the maximum vibrational temperature Tm reached in the v1- and v3-oscillators. Tm accessible via the UV-transients and also via the absorbed laser energy in the case of slow relaxation at 160 160mbar≤Pmixt≤340 mbar. In this range both techniques result in the same values for Tm. The experimental and the corresponding simulated Tm depend exponentially on the laser fluence (Tm =const . F¯in0.3) provided Tm>400K being also confirmed up to Pmixt=1200 mbar by the observed UV-transients. (Source: Laser Chemistry)

Uv photoablation of atherosclerotic lesions. application in cardiology

Laser Chemistry — Sun, 17 Aug 2008 17:41:16 +0100

Various methods for the ablation of the atherosclerotic material that fills the coronary arteries are under investigation. Among them laser coronary angioplasty is one of the most promising. In this paper we show that the XeCl excimer laser (308 nm) offers many advantages which make it appear as a rather good tool. In vitro studies demonstrate the ability of precise control of the UV photoablation process, there is no thermal damage and the risk of perforation is reduced. A suitable laser-fiber optic delivery system has been developed and the results of the first in vivo procedures are very encouraging. (Source: Laser Chemistry)

Infrared laser photochemistry of trans-1, 2-dichloroethylene. evidence for a ci atom chain reaction

Laser Chemistry — Sun, 17 Aug 2008 17:41:16 +0100

The TEA-CO2 laser induced reaction of trans-l,2-dichloroethylene (TDCE) was investigated at 925 cm-1. The laser radiation was focused to yield beam waist fluences of approximately 125 J cm-2. The major reaction product was cis-1, 2-dichloroethylene (CDCE), with a few per cent of chloroacetylene, and minor amounts of acetylene, dichloroacetylene, chloroethylene and an unidentified C4 compound also being formed. The reaction of pure TDCE was studied as a function of number of laser pulses and total pressure (0.02 to 5 torr). Some experiments were also done with added ethane (20%) and propane (2%). Evidence was obtained that the formation of the cis isomer occurs via two mechanisms, (1) a unimolecular isomerization, and (2) a CI atom chain reaction. The results are consistent with laser induced decomposition of TDCE occurring through the three lowest energy channels: unimolecular structural isomerization (57.4 kcal/mol); molecular HCI elimination (69 kcal/mol); and C-CI bond scission (89 kcal/mol). (Source: Laser Chemistry)

Solvation dynamics studied by picosecond fluorescence: microscopic reorientation and longitudinal relaxation of the solvent

Laser Chemistry — Sun, 17 Aug 2008 17:41:16 +0100

The dynamics of the Time-Dependent Fluorescence Shift (TDFS) of a rigid polar excited probe dissolved in alcohol solvents at different temperatures have been studied by picosecond time-resolved spectroscopy. The results are compared to previously published results on well characterized polar systems. These results show that solvation dynamics in such systems are strongly scaled by the microscopic (singleparticle) reorientation time τM of the solvent molecules and/or by the (macroscopic) longitudinal relaxation time τL of the solvent. The key point governing this scaling is the relative interaction between the solvent molecules and the probe compared to the interaction between the solvent molecules. It is also shown that specific interactions, such as hydrogen bonded-complex formation, may play an important role. (Source: Laser Chemistry)

Electronic spectra of 1-phenylethylamine and its derivatives in supersonic jets

Laser Chemistry — Sun, 17 Aug 2008 17:41:16 +0100

The S1←S0 fluorescence excitation spectra and dispersed fluorescence spectra of jet-cooled (+)-, (-)- and (±)-1-phenylethylamine and their derivatives (amides) have been observed. The 0-0 band of the amine locates at 37,641 cm-1. The amides which were synthesized from (+)-amine or (-)-amine with (+)-tartaric acid are diastereomers. It was found that the two diastereomers give the identical spectra with the 0-0 band at 34,757 cm-1. No difference in the spectrum indicates that the excitation is localized in the phenyl group which is far from the asymmetric carbon causing diastereoism. It was also found that 1-phenylethylamine has a fast nonradiative relaxation process in the Sstate, but such a process is removed by the formation of the amide. (Source: Laser Chemistry)

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Laser induced fluorescence

Laser Chemistry — Sun, 17 Aug 2008 17:41:16 +0100

Laser induced fluorescence (LIF) has become a common detector of atoms and molecules allowing to determine their internal state distributions. In this paper we mention the advantages of both kinds of lasers, cw or pulsed. We review some aspects of the LIF process, such as saturation or polarization effects, which could alter the results if they were not taken into account. We also indicate how LIF can be used to measure relaxation times and thus rate constants of the relaxation processes: some experimental results obtained in our laboratory illustrate these points. (Source: Laser Chemistry)

Visible lasers were better than invisible lasers in accelerating burn healing on diabetic rats

Photomedicine and Laser Surgery — Sat, 16 Aug 2008 03:02:07 +0100

Photomedicine and Laser Surgery , Vol. 0, No. 0: 1-4. Abstract Objective: This study was designed to compare the efficacy of low-power visible with invisible lasers for accelerating burn healing on diabetic rats. Background Data: Low-level laser therapy (LLLT) has been used in a number of diabetic animal ... (Source: Photomedicine and Laser Surgery)

In vivo evaluation of laser fluorescence performance using different cut-off limits for occlusal caries detection

Lasers in Medical Science — Fri, 15 Aug 2008 06:23:05 +0100

In vivo evaluation of laser fluorescence performance using different cut-off limits for occlusal caries detection Content Type Journal ArticleCategory ErratumDOI 10.1007/s10103-008-0601-zAuthors Michele Baffi Diniz, São Paulo State University (UNESP) Department of Pediatric Dentistry, Araraquara School of Dentistry Av. Humaitá 1680 14801–903 Araraquara SP BrazilJonas de Almeida Rodrigues, São Paulo State University (UNESP) Department of Pediatric Dentistry, Araraquara School of Dentistry Av. Humaitá 1680 14801–903 Araraquara SP BrazilAndréia Bolzan de Paula, State University of Campinas (UNICAMP) Department of Dental Materials, School of Dentistry of Piracicaba Av. Limeira, 901 13414–903 Piracicaba SP BrazilRita de Cássia Loiola Cordeiro, São Paulo State University (UNESP) Department of Pediatric Dentistry, Araraquara School of Dentistry Av. Humaitá 1680 14801–903 Araraquara SP Brazil Journal Lasers in Medical ScienceOnline ISSN 1435-604XPrint ISSN 0268-8921 (Source: Lasers in Medical Science)

Severity of oral mucositis in patients undergoing hematopoietic cell transplantation and an oral laser phototherapy protocol: a survey of 30 patients

Photomedicine and Laser Surgery — Wed, 13 Aug 2008 03:02:19 +0100

Photomedicine and Laser Surgery , Vol. 0, No. 0: 1-8. Abstract Background Data and Objective: Oral mucositis (OM) is one of the worst cytotoxic effects of chemotherapy and radiotherapy in patients undergoing hematopoietic cell transplantation (HCT), and it causes severe morbidity. Laser phototherapy has ... (Source: Photomedicine and Laser Surgery)