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Dental composite

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https://www.readbyqxmd.com/read/28822139/confocal-raman-mapping-of-collagen-cross-link-and-crystallinity-of-human-dentin-enamel-junction
#1
Amel Slimani, Fares Nouioua, Alban Desoutter, Bernard Levallois, Frédéric J G Cuisinier, Hervé Tassery, Elodie Terrer, Hamideh Salehi
The separation zone between enamel and dentin [dentin-enamel junction (DEJ)] with different properties in biomechanical composition has an important role in preventing crack propagation from enamel to dentin. The understanding of the chemical structure (inorganic and organic components), physical properties, and chemical composition of the human DEJ could benefit biomimetic materials in dentistry. Spatial distribution of calcium phosphate crystallinity and the collagen crosslinks near DEJ were studied using confocal Raman microscopy and calculated by different methods...
August 2017: Journal of Biomedical Optics
https://www.readbyqxmd.com/read/28816187/comparison-of-film-thickness-of-two-commercial-brands-of-glass-lonomer-cement-and-one-dual-cured-composite-an-in-vitro-study
#2
Rajat R Khajuria, Rishav Singh, Pranamee Barua, Nausheen Hajira, Naveen Gupta, Rohit R Thakkar
AIM: The present study is undertaken to examine the film thickness of three most commonly used luting cements and to determine their usage as a luting agent. MATERIALS AND METHODS: This study was carried out strictly according to the guidelines of American Dental Association (ADS) specification no. 8. Two glass slabs of 5 cm in length and 2 cm in width were used. One glass slab was kept over the other glass slab and the space between the two glass slabs was measured using metallurgical microscope at the power of 10*...
August 1, 2017: Journal of Contemporary Dental Practice
https://www.readbyqxmd.com/read/28815884/periodontal-ligament-like-tissue-regeneration-with-drilled-porous-decalcified-dentin%C3%A2-matrix-sheet-composite
#3
Ge Feng, Yan Wu, Yu Yong, Lan Huang, Shu An, Bo Hu, Jun Luo, Jinlin Song
OBJECTIVE: In this study, we constructed a composite by combining the human dental follicle cell sheet and a manual drilled porous decalcified dentin matrix that was used to construct ectopic tissue-engineered periodontal ligament-like tissues in renal capsules of nude mice. MATERIALS AND METHODS: Human dental follicle cells were harvested from human lower third molars and then embedded into a temperature-sensitive culture dish. These cells were then placed into frozen porous decalcified dentin matrix sheets and induced by 50 g/ml ascorbic acid...
August 16, 2017: Oral Diseases
https://www.readbyqxmd.com/read/28815240/-research-on-physical-and-mechanical-properties-crown-accuracy-by-using-self-made-fus-invest-dental-investment
#4
Jin-Shuang Wu, He-Lin Xing, Chao-Fang Dong, Tian-Wen Guo, Se-Fei Yang
PURPOSE: To evaluate the physical and mechanical properties of pure titanium castings cast by self- made FUS-invest dental investment, and evaluate casting accuracy. METHODS: Seven pure titanium castings were cast by self-made FUS-invest zirconium investment and analyzed using servo hydraulic dynamic experiment system (JJG139-83 standard), scanning electron microscope and energy spectrum analysis. Thirty-eight crowns of pure titanium were cast by two different methods...
April 2017: Shanghai Kou Qiang Yi Xue, Shanghai Journal of Stomatology
https://www.readbyqxmd.com/read/28814183/diagnoses-and-treatment-of-dental-disorders-in-a-research-colony-of-macaca-fascicularis-a-case-series
#5
Philippe Roux, Muriel Brecheisen, Rafael de Carvalho, Alessandra Bergadano
During daily routine oral examinations in a research colony of nonhuman primates (NHPs, Macaca fascicularis), a variety of oral-dental lesions were identified. A dental care program was established based on these findings. Based on the presence of dental clinical signs and their severity, 31 animals were triaged to be examined and treated by a veterinarian. Clinical examination consisted of visual inspection using a periodontal probe/explorer and full or partial mouth dental radiographs. Treatment was performed during the same procedure...
September 2017: Journal of Veterinary Dentistry
https://www.readbyqxmd.com/read/28813496/uneven-distribution-of-enamel-dentine-and-cementum-in-cheek-teeth-of-domestic-horses-equus-caballus-a-micro-computed-tomography-study
#6
Lauritz Martin Englisch, Kathrin Kostrzewa, Susan Kopke, Klaus Failing, Carsten Staszyk
BACKGROUND: Hypsodont equine cheek teeth possess large dental crowns, resting partly in the bony alveolus. Over a horse's life cheek teeth erupt continuously to compensate for occlusal wear of 3-4 mm per year. Parts of the crown initially resting in the bony alveolus become progressively exposed at the occlusal surface with time. Hitherto, it is unclear whether the typical structure of the equine occlusal surface, composed of a complex arrangement of enamel, dentin and cementum, remains constant or undergoes structural changes with age...
2017: PloS One
https://www.readbyqxmd.com/read/28812169/bond-strength-of-etch-and-rinse-and-self-etch-adhesive-systems-to-enamel-and-dentin-irradiated-with-a-novel-co2-9-3%C3%A2-%C3%AE-m-short-pulsed-laser-for-dental-restorative-procedures
#7
Peter Rechmann, N Bartolome, R Kinsel, R Vaderhobli, B M T Rechmann
The objective of this study was to evaluate the influence of CO2 9.3 μm short-pulsed laser irradiation on the shear bond strength of composite resin to enamel and dentin. Two hundred enamel and 210 dentin samples were irradiated with a 9.3 µm carbon dioxide laser (Solea, Convergent Dental, Inc., Natick, MA) with energies which either enhanced caries resistance or were effective for ablation. OptiBond Solo Plus [OptiBondTE] (Kerr Corporation, Orange, CA) and Peak Universal Bond light-cured adhesive [PeakTE] (Ultradent Products, South Jordan, UT) were used...
August 15, 2017: Lasers in Medical Science
https://www.readbyqxmd.com/read/28810187/histochemical-and-immunohistochemical-examination-of-odontoblasts-petroblasts-in-petrodentine-formation-of-lungfish
#8
Shunya Oka, Ichiro Sasagawa, Mikio Ishiyama
OBJECTIVE: Petrodentine, the core of the lungfish tooth plate, is a well-mineralized tissue similar to mammalian enamel and analogous to enameloid in fish teeth. Petrodentine is formed solely by petroblasts, which are specialized odontoblasts, whereas enameloid is a composite tissue produced by both odontoblasts and dental epithelial cells. To clarify the details of petrodentine formation, petroblasts were investigated using histochemical and immunohistochemical techniques. METHODS: Extant lungfish (Lepidosiren paradoxa) were used in this study...
August 3, 2017: Archives of Oral Biology
https://www.readbyqxmd.com/read/28808691/fluoride-depletes-acidogenic-taxa-in-oral-but-not-gut-microbial-communities-in-mice
#9
Koji Yasuda, Tiffany Hsu, Carey A Gallini, Lauren J Mclver, Emma Schwager, Andy Shi, Casey R DuLong, Randall N Schwager, Galeb S Abu-Ali, Eric A Franzosa, Wendy S Garrett, Curtis Huttenhower, Xochitl C Morgan
Fluoridation of drinking water and dental products prevents dental caries primarily by inhibiting energy harvest in oral cariogenic bacteria (such as Streptococcus mutans and Streptococcus sanguinis), thus leading to their depletion. However, the extent to which oral and gut microbial communities are affected by host fluoride exposure has been underexplored. In this study, we modeled human fluoride exposures to municipal water and dental products by treating mice with low or high levels of fluoride over a 12-week period...
July 2017: MSystems
https://www.readbyqxmd.com/read/28807329/impact-of-thio-urethane-additive-and-filler-type-on-light-transmission-and-depth-of-polymerization-of-dental-composites
#10
André Luis Faria-E-Silva, Carmem Silvia Pfeifer
OBJECTIVE: This study evaluated the effects of filler type and the addition of thio-urethane oligomers on light-transmission, polymerization kinetics and depth of cure of resin composites. METHODS: BisGMA:UDMA:TEGMA (5:3:2wt%) were mixed with 0 (control) or 20wt% thio-urethane. Fillers with various sizes and refractive indices were included and refractive index (RI) measured. Unfilled resins were used as controls. The RIs of materials were measured before and after polymerization...
August 11, 2017: Dental Materials: Official Publication of the Academy of Dental Materials
https://www.readbyqxmd.com/read/28806427/fixed-dental-prostheses-and-single-tooth-crowns-based-on-ceria-stabilized-tetragonal-zirconia-alumina-nanocomposite-frameworks-outcome-after-2-years-in-a-clinical-trial
#11
Fabian Hüttig, Jan P Keitel, Andreas Prutscher, Sebastian Spintzyk, Andrea Klink
PURPOSE: This clinical trial tested bilayered restorations based on ceria-stabilized tetragonal zirconia/alumina frameworks veneered with feldspathic ceramic. MATERIALS AND METHODS: A total of 67 crowns and 40 fixed dental prostheses (FDPs) were luted in 57 patients with self-etching/self-adhesive composite resin cement. Dental status and integrity of restorations were evaluated at 2 weeks, 6 months, and then annually. RESULTS: A total of 66 crowns and 36 FDPs (88% posterior) survived for success rates of 93...
August 14, 2017: International Journal of Prosthodontics
https://www.readbyqxmd.com/read/28801178/impact-of-head-and-neck-radiotherapy-on-the-mechanical-behavior-of-composite-resins-and-adhesive-systems-a-systematic-review
#12
REVIEW
Cristhian Camilo Madrid Troconis, Alan Roger Santos-Silva, Thaís Bianca Brandão, Marcio Ajudarte Lopes, Mario Fernando de Goes
OBJECTIVES: To analyze the evidence regarding the impact of head and neck radiotherapy (HNRT) on the mechanical behavior of composite resins and adhesive systems. METHODS: Searches were conducted on PubMed, Embase, Scopus and ISI Web of Science databases using "Radiotherapy", "Composite resins" and "Adhesive systems" as keywords. Selected studies were written in English and assessed the mechanical behavior of composite resins and/or adhesive systems when bonding procedure was conducted before and/or after a maximum radiation dose ≥50Gy, applied under in vitro or in vivo conditions...
August 8, 2017: Dental Materials: Official Publication of the Academy of Dental Materials
https://www.readbyqxmd.com/read/28798450/atraumatic-restorative-treatment-and-minimal-intervention-dentistry
#13
J E Frencken
Too many people worldwide suffer from the consequences of untreated dentine carious lesions. This finding reflects the inability of the currently used traditional mode of treatments to manage such lesions. A change is needed. Dental training institutions should depart from the traditional 'drill and fill' treatments and embrace the holistic oral healthcare approach that is minimal intervention dentistry (MID) and includes within it minimally invasive operative skills. Dental caries is, after all, a preventable disease...
August 11, 2017: British Dental Journal
https://www.readbyqxmd.com/read/28797747/metal-composite-adhesion-based-on-diazonium-chemistry
#14
Yara Oweis, Omar Alageel, Paige Kozak, Mohamed-Nur Abdallah, Jean-Marc Retrouvey, Marta Cerruti, Faleh Tamimi
OBJECTIVE: Composite resins do not adhere well to dental alloys. This weak bond can result in failure at the composite-metal interface in fixed dental prostheses and orthodontic brackets. The aim of this study was to develop a new adhesive, based on diazonium chemistry, to facilitate chemical bonding between dental alloys and composite resin. METHODS: Samples of two types of dental alloys, stainless steel and cobalt chromium were primed with a diazonium layer in order to create a surface coating favorable for composite adhesion...
August 7, 2017: Dental Materials: Official Publication of the Academy of Dental Materials
https://www.readbyqxmd.com/read/28797746/synthesis-of-wrinkled-mesoporous-silica-and-its-reinforcing-effect-for-dental-resin-composites
#15
Ruili Wang, Eric Habib, X X Zhu
OBJECTIVE: The aim of this work is to explore the reinforcing effect of wrinkled mesoporous silica (WMS), which should allow micromechanical resin matrix/filler interlocking in dental resin composites, and to investigate the effect of silica morphology, loading, and compositions on their mechanical properties. METHODS: WMS (average diameter of 496nm) was prepared through the self-assembly method and characterized by the use of the electron microscopy, dynamic light scattering, and the N2 adsorption-desorption measurements...
August 7, 2017: Dental Materials: Official Publication of the Academy of Dental Materials
https://www.readbyqxmd.com/read/28783506/nanoscale-silver-depositions-inhibit-microbial-colonization-and-improve-biocompatibility-of-titanium-abutments
#16
Supriya Kheur, Nimisha Singh, Dhananjay Bodas, Jean-Yves Rauch, Shantanu Jambhekar, Mohit Kheur, Jyutika Rajwade
Although titanium dental implants are biocompatible, exhibit excellent corrosion resistance and high mechanical resistance, the material fails in providing resistance to infection because it exhibits poor antimicrobial activity. To address these issues, we deposited silver onto titanium abutments (Grade 5 titanium discs) using direct current (DC) sputtering and assessed the antimicrobial activity and biocompatibility of the modified implant material. Atomic absorption spectrometry and X-ray photoelectron spectroscopy were employed to investigate the concentration and elemental composition of the deposited silver...
July 29, 2017: Colloids and Surfaces. B, Biointerfaces
https://www.readbyqxmd.com/read/28782290/risk-of-subsequent-attention-deficit-hyperactivity-disorder-among-children-and-adolescents-with-amalgam-restorations-a-nationwide-longitudinal-study
#17
Po-Yen Lin, Jui Wang, Yu-Chih Chiang, Chen-Yin Lai, Hong-Ji Chang, Lin-Yang Chi
OBJECTIVES: Dental amalgam has been used as a common restorative material since the 1800s, but concerns have been raised regarding its purported neuropsychological effects due to the neurotoxicity of mercury. In this study, a nationwide population-based database was employed to investigate the association of dental amalgam restoration with the risk of attention-deficit/hyperactivity disorder (ADHD). METHODS: After matching, 88 068 young people with at least one tooth restoration during 2002-2010 and no ADHD history before 2001 were selected and then collected the further information until the end of 2011...
August 7, 2017: Community Dentistry and Oral Epidemiology
https://www.readbyqxmd.com/read/28780383/microbiome-of-peri-implantitis-affected-and-healthy-dental-sites-in-patients-with-a-history-of-chronic-periodontitis
#18
Danae Apatzidou, David F Lappin, Graham Hamilton, Christos A Papadopoulos, Antonis Konstantinidis, Marcello P Riggio
OBJECTIVE: To determine the composition of the microbiome of peri-implantitis sites and corresponding dental sites in subjects with a history of chronic periodontitis. DESIGN: Clinical and radiographic examination assessed the periodontal/peri-implant disease status. Plaque samples were collected from one diseased implant with peri-implantitis, functional for at least two years and healthy sites in ten non-smokers who had received periodontal treatment prior to implant placement...
July 13, 2017: Archives of Oral Biology
https://www.readbyqxmd.com/read/28775282/ecological-effect-of-arginine-on-oral-microbiota
#19
Xin Zheng, Jinzhi He, Lin Wang, Shuangshuang Zhou, Xian Peng, Shi Huang, Liwei Zheng, Lei Cheng, Yuqing Hao, Jiyao Li, Jian Xu, Xin Xu, Xuedong Zhou
Dental caries is closely associated with the microbial dybiosis between acidogenic/aciduric pathogens and alkali-generating commensal bacteria colonized in the oral cavity. Our recent studies have shown that arginine may represent a promising anti-caries agent by modulating microbial composition in an in vitro consortium. However, the effect of arginine on the oral microbiota has yet to be comprehensively delineated in either clinical cohort or in vitro biofilm models that better represent the microbial diversity of oral cavity...
August 3, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28774007/do-dental-resin-composites-accumulate-more-oral-biofilms-and-plaque-than-amalgam-and-glass-ionomer-materials
#20
Ning Zhang, Mary A S Melo, Michael D Weir, Mark A Reynolds, Yuxing Bai, Hockin H K Xu
A long-time drawback of dental composites is that they accumulate more biofilms and plaques than amalgam and glass ionomer restorative materials. It would be highly desirable to develop a new composite with reduced biofilm growth, while avoiding the non-esthetics of amalgam and low strength of glass ionomer. The objectives of this study were to: (1) develop a protein-repellent composite with reduced biofilms matching amalgam and glass ionomer for the first time; and (2) investigate their protein adsorption, biofilms, and mechanical properties...
November 1, 2016: Materials
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