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This page shows you the most recent publications within this specialty of the MedWorm directory. This is page number 18.

Reply to Comment on “Chemical-Composition-Dependent Metastability of Tetragonal ZrO2 in Sol–Gel-Derived Films under Different Calcination Conditions”
Chemistry of MaterialsDOI: 10.1021/cm303266u
Source: Chemistry of Materials - October 31, 2012 Category: Materials Science Authors: Sue-min Chang and Ruey-an Doong Source Type: research

Copper-Capped Carbon Nanocones on Silicon: Plasma-Enabled Growth Control
ACS Applied Materials & InterfacesDOI: 10.1021/am301680a
Source: ACS Applied Materials and Interfaces - October 31, 2012 Category: Materials Science Authors: Shailesh Kumar, Igor Levchenko, David Farrant, Michael Keidar, Holger Kersten and Kostya (Ken) Ostrikov Source Type: research

pH-Controllable Water Permeation through a Nanostructured Copper Mesh Film
ACS Applied Materials & InterfacesDOI: 10.1021/am3014746
Source: ACS Applied Materials and Interfaces - October 31, 2012 Category: Materials Science Authors: Zhongjun Cheng, Ming Du, Kewei Fu, Naiqing Zhang and Kening Sun Source Type: research

Mimicking Atomic Bonding
Materials Science: Sticky patches bestow colloidal particles with valency
Source: Chemical and Engineering News - October 31, 2012 Category: Chemistry Authors: Bethany Halford Source Type: research

Templating Effect of Mesostructured Surfactant–Silica Monolithic Films on the Surface Structural and Mechanical Properties
ACS Applied Materials & InterfacesDOI: 10.1021/am301789v
Source: ACS Applied Materials and Interfaces - October 31, 2012 Category: Materials Science Authors: Motohiro Tagaya, Nobutaka Hanagata and Takaomi Kobayashi Source Type: research

Materials scientists make additive-free battery electrodes with nanoparticles
Materials scientists have developed a simple, robust way to fabricate carbon-free and polymer-free, lightweight colloidal films for lithium-ion battery electrodes, which could greatly improve battery performance.
Source: ScienceDaily Headlines - October 30, 2012 Category: Science Source Type: news

Highly Selective Chemical Vapor Deposition of Tin Diselenide Thin Films onto Patterned Substrates via Single Source Diselenoether Precursors
Chemistry of MaterialsDOI: 10.1021/cm302864x
Source: Chemistry of Materials - October 30, 2012 Category: Materials Science Authors: C. H. (Kees) de Groot, Chitra Gurnani, Andrew L. Hector, Ruomeng Huang, Marek Jura, William Levason and Gillian Reid Source Type: research

A Facile and Green Approach for the Controlled Synthesis of Porous SnO2 Nanospheres: Application as an Efficient Photocatalyst and an Excellent Gas Sensing Material
ACS Applied Materials & InterfacesDOI: 10.1021/am301840s
Source: ACS Applied Materials and Interfaces - October 30, 2012 Category: Materials Science Authors: P. Manjula, Ramireddy Boppella and Sunkara V. Manorama Source Type: research

CdS-Decorated ZnO Nanorod Heterostructures for Improved Hybrid Photovoltaic Devices
ACS Applied Materials & InterfacesDOI: 10.1021/am301721h
Source: ACS Applied Materials and Interfaces - October 30, 2012 Category: Materials Science Authors: Tamita Rakshit, Suvra P. Mondal, Indranil Manna and Samit K. Ray Source Type: research

Solution-Processed Inorganic–Organic Hybrid Electron Injection Layer for Polymer Light-Emitting Devices
ACS Applied Materials & InterfacesDOI: 10.1021/am301732m
Source: ACS Applied Materials and Interfaces - October 30, 2012 Category: Materials Science Authors: Takayuki Chiba, Yong-Jin Pu, Masakatsu Hirasawa, Akito Masuhara, Hisahiro Sasabe and Junji Kido Source Type: research

Surfactant-Induced Nonhydrolytic Synthesis of Phase-Pure ZrO2 Nanoparticles from Metal–Organic and Oxocluster Precursors
Chemistry of MaterialsDOI: 10.1021/cm301128a
Source: Chemistry of Materials - October 30, 2012 Category: Materials Science Authors: Mahmoud A. Sliem, Diedrich A. Schmidt, Angélique Bétard, Suresh Babu Kalidindi, Silvia Gross, Martina Havenith, Anjana Devi and Roland A. Fischer Source Type: research

Glycerol-Based Bicontinuous Cubic Lyotropic Liquid Crystal Monomer System for the Fabrication of Thin-Film Membranes with Uniform Nanopores
Chemistry of MaterialsDOI: 10.1021/cm302027s
Source: Chemistry of Materials - October 30, 2012 Category: Materials Science Authors: Blaine M. Carter, Brian R. Wiesenauer, Evan S. Hatakeyama, John L. Barton, Richard D. Noble and Douglas L. Gin Source Type: research

The hunt for electron holes
(Swiss Federal Laboratories for Materials Science and Technology (EMPA)) Hydrogen production by solar water splitting in photoelectrochemical cells has long been considered the holy grail of sustainable energy research. Iron oxide is a promising electrode material. An international team of researchers led by Empa, the Swiss Federal Laboratories for Materials Science and Technology, have now gained in-depth insights into the electronic structure of an iron oxide electrode -- while it was in operation. This opens up new possibilities for an affordable hydrogen production from solar energy.
Source: EurekAlert! - Biology - October 30, 2012 Category: Biology Source Type: news

Sulfonated Poly(ether ether ketone)/Polypyrrole Core–Shell Nanofibers: A Novel Polymeric Adsorbent/Conducting Polymer Nanostructures for Ultrasensitive Gas Sensors
ACS Applied Materials & InterfacesDOI: 10.1021/am301712t
Source: ACS Applied Materials and Interfaces - October 29, 2012 Category: Materials Science Authors: Wei Wang, Zhenyu Li, Tingting Jiang, Zhiwei Zhao, Ye Li, Zhaojie Wang and Ce Wang Source Type: research

Structural Study of Octacalcium Phosphate Bone Cement Conversion in Vitro
ACS Applied Materials & InterfacesDOI: 10.1021/am301809y
Source: ACS Applied Materials and Interfaces - October 29, 2012 Category: Materials Science Authors: Marco Fosca, Vladimir S. Komlev, Alexander Yu. Fedotov, Ruggero Caminiti and Julietta V. Rau Source Type: research

Modification of the Surfaces of Silicon Wafers with Temperature-Responsive Cross-Linkable Poly[oligo(ethylene oxide) methacrylate]-Based Star Polymers
ACS Applied Materials & InterfacesDOI: 10.1021/am301597b
Source: ACS Applied Materials and Interfaces - October 29, 2012 Category: Materials Science Authors: Sangwoo Park, Mingjiang Zhong, Taeheon Lee, Hyun-jong Paik and Krzysztof Matyjaszewski Source Type: research

Shape-Controlled Synthesis of Silver Nanocrystals by X-ray Irradiation for Inkjet Printing
ACS Applied Materials & InterfacesDOI: 10.1021/am3015718
Source: ACS Applied Materials and Interfaces - October 29, 2012 Category: Materials Science Authors: Hsien-Tse Tung, In-Gann Chen, Ivan M Kempson, Jenn-Ming Song, Yu-Feng Liu, Po-Wei Chen, Weng-Sing Hwang and Yeukuang Hwu Source Type: research

Light-Assisted Anodized TiO2 Nanotube Arrays
ACS Applied Materials & InterfacesDOI: 10.1021/am301527g
Source: ACS Applied Materials and Interfaces - October 29, 2012 Category: Materials Science Authors: York R. Smith, Biplab Sarma, Swomitra K. Mohanty and Mano Misra Source Type: research

Observing the Nucleation Phase of Atomic Layer Deposition In Situ
Chemistry of MaterialsDOI: 10.1021/cm302398v
Source: Chemistry of Materials - October 29, 2012 Category: Materials Science Authors: James F. Mack, Philip B. Van Stockum, Yonas T. Yemane, Manca Logar, Hitoshi Iwadate and Fritz B. Prinz Source Type: research

Surface Doping Quantum Dots with Chemically Active Native Ligands: Controlling Valence without Ligand Exchange
Chemistry of MaterialsDOI: 10.1021/cm3026957
Source: Chemistry of Materials - October 29, 2012 Category: Materials Science Authors: Elham Tavasoli, Yijun Guo, Pranaw Kunal, Javier Grajeda, Allison Gerber and Javier Vela Source Type: research

First-Principles Study on Relaxor-Type Ferroelectric Behavior without Chemical Inhomogeneity in BaTaO2N and SrTaO2N
Chemistry of MaterialsDOI: 10.1021/cm302335q
Source: Chemistry of Materials - October 29, 2012 Category: Materials Science Authors: Yoyo Hinuma, Hiroki Moriwake, Ya-Ru Zhang, Teruki Motohashi, Shinichi Kikkawa and Isao Tanaka Source Type: research

Effects of Nicotine on Spinal Cord Injury Pain Vary Among Subtypes of Pain and Smoking Status: Results From a Randomized, Controlled Experiment
Abstract: Smoking has been associated with increased pain severity in general chronic pain populations. Less is known about the effects of smoking and nicotine on the multifaceted and often complex subtypes of pain that frequently occur following spinal cord injury (SCI). The purpose of this study was to examine the effects of nicotine on self-reported pain among individuals with SCI and to determine if the effect of nicotine varied by pain subtype. A randomized, placebo-controlled crossover design was used to determine the effect of nicotine exposure on subtypes of SCI-related pain among smokers and nonsmokers. A complex ...
Source: The Journal of Pain - October 29, 2012 Category: Materials Science Authors: Elizabeth J. Richardson, Timothy J. Ness, David T. Redden, Christopher C. Stewart, J. Scott Richards Tags: Original Reports Source Type: research

Alveolar bone regeneration using poly-(lactic acid-co-glycolic acid-co-{varepsilon}-caprolactone) porous membrane with collagen sponge containing basic fibroblast growth factor: An experimental study in the dog
The aim of this study was to evaluate the effects of combining porous poly-lactic acid-co-glycolic acid-co--caprolactone (PLGC) as a barrier membrane and collagen sponge containing basic fibroblast growth factor (bFGF) to promote bone regeneration in the canine mandible. In six beagle dogs, two lateral bone defects per side were created in the mandible. The lateral bone defects on the left side were treated with a PLGC membrane plus a collagen sponge containing bFGF. In half of these, the collagen sponge contained 50 µg of bFGF. In the other half, it contained 250 µg of bFGF. As a control, we treated ...
Source: Journal of Biomaterials Applications - October 28, 2012 Category: Materials Science Authors: Matsumoto, G., Hoshino, J., Kinoshita, Y., Sugita, Y., Kubo, K., Maeda, H., Ikada, Y., Kinoshita, Y. Tags: Articles Source Type: research

Effects of dexamethasone-loaded PLGA microspheres on human fetal osteoblasts
Integration of a drug delivery function into implantable medical devices enables local release of specific bioactives to control cells–surface interactions. One alternative to achieve this biofunctionality for bone implants is to incorporate particulate drug delivery systems (DDSs) into the rough or porous implant surfaces. The scope of this study was to assess the effects of a model DDS consisting of poly(D,L-lactide-co-glycolide) (PLGA) microspheres loaded with an anti-inflammatory drug, dexamethasone (DXM), on the response of Simian Virus-immortalized Human Fetal Osteoblast (SV-HFO) cells. The microspheres were pr...
Source: Journal of Biomaterials Applications - October 28, 2012 Category: Materials Science Authors: Dawes, G., Fratila-Apachitei, L., Necula, B., Apachitei, I., van Leeuwen, J., Duszczyk, J., Eijken, M. Tags: Articles Source Type: research

Enhancing biocompatibility and corrosion resistance of Mg implants via surface treatments
Oxide coating layers were formed on a pure magnesium (Mg) substrate through anodization and micro-arc oxidation (MAO) in order to enhance the biocompatibility and reduce the degradation rate. A thin, smooth MgO coating layer was formed after the anodization. On the other hand, when the Mg was treated using the MAO process, a relatively thick, rough MgO layer was formed. The corrosion properties were investigated using electrochemical and ion release tests in a simulated body fluid. Both the anodization and the MAO treatment enhanced the corrosion resistance of the Mg specimens. However, the MgO layers that formed on the su...
Source: Journal of Biomaterials Applications - October 28, 2012 Category: Materials Science Authors: Jo, J.-H., Hong, J.-Y., Shin, K.-S., Kim, H.-E., Koh, Y.-H. Tags: Articles Source Type: research

Fabrication and material properties of fibrous PHBV scaffolds depending on the cross-ply angle for tissue engineering
Fibrous PHBV cross-ply scaffolds were fabricated using the electrospinning technique. The electrospun fibers were arranged depending on angles of alignment, which were 180°, 90°, 60°, and 45°. The stress and strain values of the fibrous PHBV cross-ply scaffolds increased as the cross-ply angle increased. At 180°, the strength and strain values of the fibers depended on tensile loading directions. At an alignment of 90°, the PHBV scaffolds had a stress value of 3.5 MPa, which was more than two times higher than the random structure. The cell morphology and proliferation of L-929 cells was strongly de...
Source: Journal of Biomaterials Applications - October 28, 2012 Category: Materials Science Authors: Kim, Y.-H., Min, Y.-K., Lee, B.-T. Tags: Articles Source Type: research

Polyamidoamine dendron-bearing lipid assemblies: Their morphologies and gene transfection ability
In this study, we showed the various generations of polyamidoamine dendron-bearing lipids could form various assembly morphologies. Furthermore, the effect of the assembly morphologies made from dendron-bearing lipids for transfection abilities were examined. We synthesized three novel dendron-bearing lipids, DL-U2-G1 (G1), DL-U2-G2 (G2), and DL-U2-G3 (G3), which included first, second, and third generation polyamidoamine dendrons, respectively. Transmission electron microscopy showed that lipoplexes (complexes with cationic lipids and plasmid DNA) comprising G1 had multilamellar structures. G2 presented as aggregates of c...
Source: Journal of Biomaterials Applications - October 28, 2012 Category: Materials Science Authors: Iwashita, S., Hiramatsu, Y., Otani, T., Amano, C., Hirai, M., Oie, K., Yuba, E., Kono, K., Miyamoto, M., Igarashi, K. Tags: Articles Source Type: research

Characterization and antibacterial efficacy of silver-coated Ca-Na-Zn-Si/Ti glasses
A glass series [xSiO2[–y]·0.36ZnO·0.17Na2O·0.05CaO (starting at x = 0.50, y = 0.08 TiO2)] was formulated with TiO2 substituting SiO2. Each glass/silver-coated glass was characterized using X-ray diffraction, X-ray photoelectron spectroscopy (XPS), and scanning electron microscopy. Surface area analysis revealed significant changes after silver coating, 0.43–0.95 m2/g (control), to 0.53–1.85 m2/g (AU-1), and 0.20–1.11 m2/g (AU-2). Ion release from uncoated glasses included sodium (0.08 mg/L), calcium (0.07 mg/L), and zinc (0.008 mg/L), where silver-coated glasses presented 0.42 m...
Source: Journal of Biomaterials Applications - October 28, 2012 Category: Materials Science Authors: Wren, A., Akgun, B., Adams, B., Coughlan, A., Mellott, N., Towler, M. Tags: Articles Source Type: research

Hyaluronic acid as an internal wetting agent in model DMAA/TRIS contact lenses
Model silicone hydrogel contact lenses, comprised of N,N-dimethylacrylamide and methacryloxypropyltris (trimethylsiloxy) silane, were fabricated and hyaluronic acid (HA) was incorporated as an internal wetting agent using a dendrimer-based method. HA and dendrimers were loaded into the silicone hydrogels and cross-linked using 1-ethyl-3-(3-dimethylaminopropyl)-carbodiimide chemistry. The presence and location of HA in the hydrogels was confirmed using X-ray photoelectron spectroscopy and confocal laser scanning microscopy, respectively. The effects of the presence of HA on the silicone hydrogels on hydrophilicity, swelling...
Source: Journal of Biomaterials Applications - October 28, 2012 Category: Materials Science Authors: Weeks, A., Luensmann, D., Boone, A., Jones, L., Sheardown, H. Tags: Articles Source Type: research

Composite membranes of poly(lactic acid) with zinc-added bioactive glass as a guiding matrix for osteogenic differentiation of bone marrow mesenchymal stem cells
This study aims to produce a degradable and bone-bioactive membrane for guiding bone regeneration by combining a degradable polymer, poly(lactic acid) (PLA), with a bioactive inorganic zinc-containing bioactive glass (ZnBG). The in vitro osteogenic development of rat bone marrow mesenchymal stem cells (rBMSCs) upon different membrane substrates (pure PLA control, PLA–BG, and PLA–ZnBG) was investigated in terms of bone cell phenotype syntheses and mineralization. Results showed significantly stimulated production of alkaline phosphatase and osteocalcin at days 14 and 21 in the membranes containing BG and Zn...
Source: Journal of Biomaterials Applications - October 28, 2012 Category: Materials Science Authors: Oh, S.-A., Won, J.-E., Kim, H.-W. Tags: Articles Source Type: research

Sodium-phosphorylated chitosan/zinc oxide complexes and evaluation of their cytocompatibility: An approach for periodontal dressing
The aim of this study was to evaluate the possibility of metal complex formation between sodium-phosphorylated chitosan (PCTS) and ZnO. The polymer–metal complex formation was investigated in terms of thermal degradation. The structure deduction of the PCTS/ZnO complex was investigated by means of Fourier transform infrared spectroscopy and X-ray diffraction (XRD). The PCTS/ZnO complexes were formed by the sharing of lone pairs of electrons from the N atoms in the amine groups and O atoms in the phosphate and hydroxyl groups of PCTS to the protonated hydroxyl species on the ZnO surface. Because complex formation occu...
Source: Journal of Biomaterials Applications - October 28, 2012 Category: Materials Science Authors: Srakaew, V., Ruangsri, P., Suthin, K., Thunyakitpisal, P., Tachaboonyakiat, W. Tags: Articles Source Type: research

Chitosan-based thermosensitive hydrogel as a promising ocular drug delivery system: Preparation, characterization, and in vivo evaluation
The purpose of this study was to evaluate the feasibility of in situ thermosensitive hydrogel based on chitosan in combination with disodium α-d-Glucose 1-phosphate (DGP) for ocular drug delivery system. Aqueous solution of chitosan/DGP underwent sol–gel transition as temperature increased which was flowing sol at room temperature and then turned into non-flowing hydrogel at physiological temperature. The properties of gels were characterized regarding gelation time, gelation temperature, and morphology. The sol-to-gel phase transition behaviors were affected by the concentrations of chitosan, DGP and the model...
Source: Journal of Biomaterials Applications - October 28, 2012 Category: Materials Science Authors: Chen, X., Li, X., Zhou, Y., Wang, X., Zhang, Y., Fan, Y., Huang, Y., Liu, Y. Tags: Articles Source Type: research

Biofunctionalisation of polymeric scaffolds for neural tissue engineering
Patients who experience injury to the central or peripheral nervous systems invariably suffer from a range of dysfunctions due to the limited ability for repair and reconstruction of damaged neural tissue. Whilst some treatment strategies can provide symptomatic improvement of motor and cognitive function, they fail to repair the injured circuits and rarely offer long-term disease modification. To this end, the biological molecules, used in combination with neural tissue engineering scaffolds, may provide feasible means to repair damaged neural pathways. This review will focus on three promising classes of neural tissue en...
Source: Journal of Biomaterials Applications - October 28, 2012 Category: Materials Science Authors: Wang, T., Forsythe, J., Parish, C., Nisbet, D. Tags: Review Article Source Type: research

The application of plastic compression to modulate fibrin hydrogel mechanical properties.
In conclusion, plastic compression can be used to modulate the density and mechanical properties of cell-seeded fibrin hydrogels and represents a useful tool for both in theatre and in vitro tissue engineering applications. PMID: 23149099 [PubMed - as supplied by publisher]
Source: Journal of the Mechanical Behavior of Biomedical Materials - October 27, 2012 Category: Materials Science Authors: Haugh MG, Thorpe SD, Vinardell T, Buckley CT, Kelly DJ Tags: J Mech Behav Biomed Mater Source Type: research

Polymer-Composite Materials for Radiation Protection
ACS Applied Materials & InterfacesDOI: 10.1021/am300783d
Source: ACS Applied Materials and Interfaces - October 26, 2012 Category: Materials Science Authors: Shruti Nambiar and John T. W. Yeow Source Type: research

CuInS2 Nanocrystals/PEDOT:PSS Composite Counter Electrode for Dye-Sensitized Solar Cells
ACS Applied Materials & InterfacesDOI: 10.1021/am3018338
Source: ACS Applied Materials and Interfaces - October 26, 2012 Category: Materials Science Authors: Zhongyi Zhang, Xiaoying Zhang, Hongxia Xu, Zhihong Liu, Shuping Pang, Xinhong Zhou, Shanmu Dong, Xiao Chen and Guanglei Cui Source Type: research

Ablation time efficiency and lesion volume - in vitro comparison of 4 mm, non irrigated, gold- and platinum-iridium-tip radiofrequency ablation catheters
Conclusion The gold-tip catheters had a lower tip temperature resulting in higher energy delivery due to the better thermo-conductivity of the gold alloy. A significantly higher lesion volume and a faster lesion creation were found for gold catheters as compared to Pt/Ir catheters. Gold-tip catheters can create the same adequate lesion within 33.3 % less ablation time due to the higher values of delivered energy as compared to those observed with the use of Pt/Ir catheters. Content Type Journal ArticlePages 1-6DOI 10.1007/s10840-012-9743-9Authors Tibor Balázs, Department of Materials Science ...
Source: Journal of Interventional Cardiac Electrophysiology - October 26, 2012 Category: Cardiology Tags: Journal of Interventional Cardiac Electrophysiology Source Type: research

Materials Science: Feeling the Strain
Traditional strain gauges use a patterned metallic foil, in which the change in shape on deformation translates into a change in electrical conductivity. These devices typically have a gauge factor … [Read more]
Source: Editors' Choice - October 26, 2012 Category: Science Authors: Stewart Wills (mailto:swills at aaas.org) Source Type: research

Editors' Choice
Astronomy: Blowing in the Solar Wind | Education: Pay for Percentile | Neuroscience: Countering Impaired Cognition | Geophysics: The Core from Above | Biochemistry: A Viral Turn-Off | Physics: Topological Quasicrystals | Materials Science: Feeling the Strain
Source: Science: Current Issue - October 26, 2012 Category: Science Authors: Stewart Wills (mailto:swills at aaas.org) Source Type: research

Nanomechanical properties of dental resin-composites
Abstract: Objective: To determine by nanoindentation the hardness and elastic modulus of resin-composites, including a series with systematically varied filler loading, plus other representative materials that fall into the categories of flowable, bulk-fill and conventional nano-hybrid types.Methods: Ten dental resin-composites: three flowable, three bulk-fill and four conventional were investigated using nanoindentation. Disc specimens (15mm×2mm) were prepared from each material using a metallic mold. Specimens were irradiated in the mold at top and bottom surfaces in multiple overlapping points (40s each) with light cur...
Source: Dental Materials - October 25, 2012 Category: Materials Science Authors: S. El-Safty, R. Akhtar, N. Silikas, D.C. Watts Tags: Original articles Source Type: research

Riboflavin as a dentin crosslinking agent: Ultraviolet A versus blue light
Abstract: Objectives: To investigate the effect of photo-activation of riboflavin either by ultraviolet (UVA) or visible blue light (BL) on the biodegradation resistance, strength of demineralized dentin matrix, bond strength to dentin and resin/dentin interface morphology.Methods: Dentin beams were demineralized, treated with 0.1% or 1% riboflavin solution for 5min and photo-activated with UVA or BL for 20s. The ultimate tensile strength (UTS) and hydroxyproline (HYP) release were assessed after 24h collagenase challenge. For micro-tensile bond strength (μTBS) testing and resin/dentin interface morphology investigation, ...
Source: Dental Materials - October 25, 2012 Category: Materials Science Authors: Amr S. Fawzy, Lorraine I. Nitisusanta, Kulsum Iqbal, Umer Daood, Jennifer Neo Tags: Original articles Source Type: research

Influence of surface conditioning on bonding to polyetheretherketon (PEEK)
Conclusion: The use of the methylmethacrylate containing primer Luxatemp Glaze & Bond after air-abrasion of PEEK surfaces can be recommended clinically as promising bonding method to PEEK.
Source: Dental Materials - October 25, 2012 Category: Materials Science Authors: Matthias Kern, Frank Lehmann Tags: Original articles Source Type: research

Odontogenic responses of human dental pulp cells to collagen/nanobioactive glass nanocomposites
Abstract: Objectives: Collagen-based nanocomposite incorporating nanobioactive glass (Col/nBG) was developed as a scaffolding matrix for dentin–pulp regeneration. The effects of the novel matrix on the proliferation of human dental pulp cells (hDPCs) and their differentiation into odontoblastic lineage were investigated.Methods: Nanocomposite scaffold was prepared by incorporating nBG within the Col solution and then reconstituting them into a membrane form. Cell growth by MTS assay, adhesion by scanning electron microscopy (SEM), and odontoblastic differentiation by alkaline phosphatase (ALP) activity, mineralization, a...
Source: Dental Materials - October 25, 2012 Category: Materials Science Authors: Won-Jung Bae, Kyung-San Min, Jong-Jin Kim, Jung-Ju Kim, Hae-Won Kim, Eun-Cheol Kim Tags: Original articles Source Type: research

Two- and three-body wear of composite resins
Abstract: Objective: The aim of the present study was to investigate two- and three-body wear of microfilled, micro-hybrid and nano-hybrid composite resins using a ball-on-disc sliding device.Methods: One microfilled (Durafill VS), one micro-hybrid (Filtek Z250), one hybrid (Clearfil AP-X), one nanofilled (Filtek Supreme XT), and two nano-hybrid (MI Flow, Venus Diamond) composite resins were examined. The composites were filled in a cylindrical cavity, and light polymerized. After storage in 37°C distilled water for 7days, all specimens were tested with a custom-made ball-on-disc sliding device with a zirconia ball as ant...
Source: Dental Materials - October 25, 2012 Category: Materials Science Authors: Natthavoot Koottathape, Hidekazu Takahashi, Naohiko Iwasaki, Masafumi Kanehira, Werner J. Finger Tags: Original articles Source Type: research

Micropatterned silica thin films with nanohydroxyapatite micro-aggregates for guided tissue regeneration
Abstract: Surface modification of biomaterials has been shown to improve the biological response to dental implants. The ability to create a controlled micro-texture on the implant via additive surface modification techniques with bioactive nanohydroxyapatite (nanoHA) may positively influence guided tissue regeneration.Objective: The main goal of this study was to produce micro-fabricated SiO2 surfaces modified with nanohydroxyapatite particles and to characterize their influence on the biological response of Human Dental-Pulp Mesenchymal Stem Cells (hDP-MSCs) and Streptococcus mutans.Materials and methods: A combined meth...
Source: Dental Materials - October 25, 2012 Category: Materials Science Authors: A. Carvalho, A. Pelaez-Vargas, D. Gallego-Perez, L. Grenho, M.H. Fernandes, A.H. De Aza, M.P. Ferraz, D.J. Hansford, F.J. Monteiro Tags: Original articles Source Type: research

Simultaneous determination of polymerization shrinkage, exotherm and thermal expansion coefficient for dental resin-composites
Abstract: Objectives: To measure shrinkage strain, exotherm, and coefficient of thermal expansion (CTE), simultaneously for a set of representative resin-composites.Methods: Six commercially available resin-composites with different filler loadings were selected. A modified bonded-disk instrument that includes temperature-monitoring apparatus was used to measure simultaneously: shrinkage strain, exotherm, and CTE. Shrinkage strain and temperature of disk specimens (n=3/materials) were monitored for 1h after irradiation for 20s at 1200mW/cm2 (energy density=24J/cm2). Disks were irradiated for a second time 60min after the f...
Source: Dental Materials - October 25, 2012 Category: Materials Science Authors: A. Alnazzawi, D.C. Watts Tags: Original articles Source Type: research

Effect of a non-thermal, atmospheric-pressure, plasma brush on conversion of model self-etch adhesive formulations compared to conventional photo-polymerization
Abstract: Objective: To determine the effectiveness and efficiency of non-thermal, atmospheric plasmas for inducing polymerization of model dental self-etch adhesives.Methods: The monomer mixtures used were bis-[2-(methacryloyloxy)ethyl] phosphate (2MP) and 2-hydroxyethyl methacrylate (HEMA), with mass ratios of 70/30, 50/50 and 30/70. Water was added to the above formulations: 10–30wt%. These monomer/water mixtures were treated steadily for 40s under a non-thermal atmospheric plasma brush working at temperatures from 32 to 35°C. For comparison, photo-initiators were added to the above formulations for photo-polymerizat...
Source: Dental Materials - October 25, 2012 Category: Materials Science Authors: Mingsheng Chen, Ying Zhang, Xiaomei Yao, Hao Li, Qingsong Yu, Yong Wang Tags: Original articles Source Type: research

Porous zirconia/hydroxyapatite scaffolds for bone reconstruction
Abstract: Objective: Highly porous apatite-based bioceramic scaffolds have been widely investigated as three-dimensional (3D) templates for cell adhesion, proliferation, and differentiation promoting the bone regeneration. Their fragility, however, limits their clinical application especially for a large bone defect.Methods: To address the hypothesis that using a ZrO2/hydroxyapatite (HAp) composite might improve both the mechanical properties and cellular compatibility of the porous material, we fabricated ZrO2/HAp composite scaffolds with different ZrO2/HAp ratios, and evaluated their characteristics. In addition, porous ...
Source: Dental Materials - October 25, 2012 Category: Materials Science Authors: Sang-Hyun An, Takuya Matsumoto, Hiroyuki Miyajima, Atsushi Nakahira, Kyo-Han Kim, Satoshi Imazato Tags: Original articles Source Type: research

Wear at the titanium–titanium and the titanium–zirconia implant–abutment interface: A comparative in vitro study
Abstract: Objective: The purpose of this study was to determine and measure the wear of the interface between titanium implants and one-piece zirconia abutments in comparison to titanium abutments.Methods: 6 implants were secured into epoxy resin blocks. The implant interface of these implants and 6 corresponding abutments (group Zr: three one-piece zirconia abutments; group Ti: three titanium abutments) were examined by a microscope and scanning electron micrograph (SEM). Also the implants and the abutments were scanned by 3D-Micro Computer Tomography (CT). The abutments were connected to the implants and cyclically loade...
Source: Dental Materials - October 25, 2012 Category: Materials Science Authors: Michael Stimmelmayr, Daniel Edelhoff, Jan-Frederik Güth, Kurt Erdelt, Arndt Happe, Florian Beuer Tags: Original articles Source Type: research

Initial attachment, subsequent cell proliferation/viability and gene expression of epithelial cells related to attachment and wound healing in response to different titanium surfaces
Abstract: Objectives: A tight seal between the epithelium and the dental implant surface is required to prevent bacterial inflammation and soft tissue recession and therefore to demonstrate a long-term success. Surface hydrophilicity was recently shown to promote osseointegration. The aim of this study was to investigate the influence of surface hydrophilicity in combination with surface topography of Ti implant surfaces on the behavior and activation/differentiation of epithelial cells using a set of in vitro experiments mimicking the implant-soft tissue contact.Methods: Hydrophobic acid-etched (A) and coarse-grit-blasted...
Source: Dental Materials - October 25, 2012 Category: Materials Science Authors: Na An, Xiaohui Rausch-fan, Marco Wieland, Michael Matejka, Oleh Andrukhov, Andreas Schedle Tags: Original articles Source Type: research