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Dental composite

Palena A Pinto, Guillaume Colas, Tobin Filleter, Grace M De Souza
Yttria-stabilized tetragonal zirconia polycrystals (3Y-TZP) is a ceramic material used in indirect dental restorations. However, phase transformation at body temperature may compromise the material's mechanical properties, affecting the clinical performance of the restoration. The effect of mastication on 3Y-TZP aging has not been investigated. 3Y-TZP specimens (IPS E-max ZirCAD and Z5) were aged in three different modes (n=13): no aging (control), hydrothermal aging (HA), or chewing simulation (CS). Mechanical properties and surface topography were analyzed...
October 26, 2016: Microscopy and Microanalysis
Andrew B Schenkel, Ivy Peltz, Analia Veitz-Keenan
BACKGROUND: Resin-based composite (RBC) is currently accepted as a viable material for the restoration of caries for posterior permanent teeth requiring surgical treatment. Despite the fact that the thermal conductivity of the RBC restorative material closely approximates that of natural tooth structure, postoperative hypersensitivity is sometimes still an issue. Dental cavity liners have historically been used to protect the pulp from the toxic effects of some dental restorative materials and to prevent the pain of thermal conductivity by placing an insulating layer between restorative material and the remaining tooth structure...
October 25, 2016: Cochrane Database of Systematic Reviews
Mayo Takada, Masaya Suzuki, Maiko Haga-Tsujimura, Koichi Shinkai
We examined the effects of adhesive systems under study applied for a laser-cut cavity using an Er,Cr:YSGG laser on rat dental pulp at 24 h and 14 days postoperatively. Group 1, laser-cut cavities were treated with a self-etching-primer and bonding agent; group 2, pretreated with a phosphoric-acid, and then treated with a self-etching-primer and bonding agent; group 3, pretreated with a phosphoric-acid and sodium-hypochlorite, and then treated with a self-etching-primer and bonding agent; and group 4, treated with an all-in-one adhesive...
October 24, 2016: Odontology
Alexandre Cestari
INTRODUCTION: Amorphous aluminosilicates glasses containing fluorine, phosphorus and calcium are used as a component of the glass ionomer dental cement. This cement is used as a restorative, basis or filling material, but presents lower mechanical resistance than resin-modified materials. The Sol-Gel method is a possible route for preparation of glasses with lower temperature and energy consumption, with higher homogeneity and with uniform and nanometric particles, compared to the industrial methods Glass ionomer cements with uniform, homogeneous and nanometric particles can present higher mechanical resistance than commercial ionomers...
October 20, 2016: Journal of Dentistry
Maria Menini, Paolo Pesce, Francesco Pera, Fabrizio Barberis, Alberto Lagazzo, Ludovica Bertola, Paolo Pera
OBJECTIVES: The aim of the present study was to investigate the biocompatibility and mechanical characteristics of dental implant frameworks made of carbon fiber composite. METHODS: The biocompatibility of intact samples and fragments was evaluated by cell count and MTT test according to EN-ISO 10993-5:2009 directions. Destructive and non-destructive mechanical tests were performed in order to evaluate: porosity, static and dynamic elastic modulus of carbon fiber samples...
January 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
Paweł J. Zawadzki, Bohdan Starościak, Konrad Perkowski, Wanda Baltaza, Marcin Padzik, Krzysztof Pionkowski, Lidia Chomicz
In this research, a comparative analysis of results of investigations involving different human populations, in terms of a relation between the oral cavity health and the species composition of mouth microbiota is reported. The purpose of this analysis was to identify and assess microorganisms that could cause health complications in patients with neoplasm requiring dental problem-related surgical management. The patients with the oral cancer surgically treated and those without neoplasm were assessed for their oral health: status of teeth, gingiva, periodontium, and occurrence of inflammatory processes...
October 1, 2016: Annals of Parasitology
Khaled Ahmed
Data sourcesMedline, Web of Science, Latin American and Caribbean Health Sciences Literature database (LILACS), Brazilian Library in Dentistry (BBO), the Cochrane Library, abstracts of the annual conference of the International Association for Dental Research (IADR), System for Information on Grey literature in Europe (SIGLE), ProQuest Dissertations and Theses Fulltext database as well as the Periódicos Capes Theses, Current Controlled Trials, International Clinical trials registry platform, the ClinicalTrials...
September 2016: Evidence-based Dentistry
A Tofiño-Rivera, M Ortega-Cuadros, D Galvis-Pareja, H Jiménez-Rios, L J Merini, M C Martínez-Pabón
BACKGROUND: Caries is a public health problem, given that it prevails in 60 to 90% of the school-age global population. Multiple factors interact in its etiology, among them dental plaque is necessary to have lactic acid producing microorganisms like Streptococcus from he Mutans group. Existing prevention and treatment measures are not totally effective and generate adverse effects, which is why it is necessary to search for complementary strategies for their management. AIM: The study sought to evaluate the eradication capacity of Streptococcus mutans biofilms and the toxicity on eukaryotic cells of Lippia alba and Cymbopogon citratus essential oils METHODOLOGY: Essential oils were extracted from plant material through steam distillation and then its chemical composition was determined...
October 17, 2016: Journal of Ethnopharmacology
Liang Chen, Cornelis Johannes Kleverlaan, Kunneng Liang, Deqin Yang
STATEMENT OF PROBLEM: Polyvinyl siloxane impression material has been widely used as a lingual matrix for rebuilding missing tooth structure with composite resin. The composite resin is light polymerized in contact with the polyvinyl siloxane impression material. However, polyvinyl siloxane impression material has been shown to interact with other dental materials. PURPOSE: The purpose of this study was to assess the effect of polyvinyl siloxane impression materials on the polymerization of composite resins by assessing the Vickers microhardness and degree of conversion of polyvinyl siloxane...
October 17, 2016: Journal of Prosthetic Dentistry
Andreas Gravvanis, Despoina Kakagia, Nick Katsikeris, Dimosthenis Tsoutsos
BACKGROUND: This report aims to first present Integra as an adjunct to complex mandibular reconstruction for intraoral lining resurfacing, and to review the literature on the use of dermal matrices for mucosal resurfacing of the floor of the mouth. CLINICAL REPORT: A 62-year-old female patient with previous ablation surgery for squamous cell carcinoma of the floor of the mouth, presented with extrusion of the mandibular plate through the chin skin and serious tongue tethering...
October 2016: Journal of Craniofacial Surgery
Mădălina-Anca Lazar, Horaţiu Rotaru, Ioana Bâldea, Adina B Boşca, Cristian P Berce, Cristina Prejmerean, Doina Prodan, Radu S Câmpian
This study aims to assess the biocompatibility of new advanced fiber-reinforced composites (FRC) to be used for custom-made cranial implants. Four new formulations of FRC were obtained using polymeric matrices (combinations of monomers bisphenol A glycidylmethacrylate [bis-GMA], urethane dimethacrylate [UDMA], triethylene glycol dimethacrylate [TEGDMA], hydroxyethyl methacrylate [HEMA]) and E-glass fibers (300 g/mp). Every FRC contains 65% E-glass and 35% polymeric matrix. Composition of polymeric matrices are: bis-GMA (21%), TEGDMA (14%) for FRC1; bis-GMA (21%), HEMA (14%) for FRC2; bis-GMA (3...
October 2016: Journal of Craniofacial Surgery
P Pott, A Rzasa, M Stiesch, M Eisenburger
This in vitro study compares a new system for manual chair side fabrication of indirect composite restorations, which uses silicone models after alginate impressions, to CAD/CAM-technology and laboratory manual production techniques. MATRIALS AND METHODS: and study design Each 10 composite inlays were fabricated using different types of production techniques: CAD/CAM- technology (A), the new inlay system (B), plaster model after alginate impression (C) or silicone impression (D). The inlays were adapted into a metal tooth and silicone replicas of the cement gaps were made and measured...
September 2016: European Journal of Paediatric Dentistry: Official Journal of European Academy of Paediatric Dentistry
Andrej M Kielbassa, Georg Glockner, Michael Wolgin, Karl Glockner
BACKGROUND: With the Minamata Convention the use of mercury will be phased down, and this undoubtedly will have an effect on dental treatment regimens and economic resources. Composite resin restorations are considered viable alternatives to amalgam fillings; however, these will not be covered completely by health insurance systems in many countries. Recently, a high-viscosity glass-ionomer cement (hvGIC) processed with a resinous coating (RC) has been introduced, and has been marketed as a restorative material in load-bearing Class I cavities (and in Class II cavities with limited size), thus serving as a possible alternative to amalgam fillings...
2016: Quintessence International
Miao Ai, Zhiyun Du, Siqi Zhu, Hongjuan Geng, Xu Zhang, Qing Cai, Xiaoping Yang
OBJECTIVE: The object is to find a functional one-dimensional nanofibrous filler for composite resin, which is able to provide both efficient reinforcement and high antibacterial activity. METHODS: Hydroxyapatite (HA) nanowires were synthesized via hydrothermal technique using calcium oleate as the precursor. Polydopamine (PDA)-coated HA (HA-PDA) nanowires were prepared by soaking HA nanowires in dopamine (DA) aqueous solution. Silver nanoparticles (AgNPs)-laden HA (HA-PDA-Ag) nanowires were prepared via reduction reaction by adding silver nitrate and glucose into HA-PDA suspensions in DI water...
October 10, 2016: Dental Materials: Official Publication of the Academy of Dental Materials
Felice Femiano, Rossella Femiano, Alessandro Lanza, Michele Lanza, Letizia Perillo
This study compares sensitivity reduction after dental restoration with and without prior diode laser (DL) irradiation for cervical dentine hypersensitivity (CDH) from non-carious cervical lesions (NCCLs) unresponsive to desensitizing agents. Eighty-eight teeth of 28 subjects (21 females; age 23-64 years), with CDH from NCCL were included in this study. NCCLs of each oral quadrant were randomized in two groups (study group (SG)) to estimate the sensitivity reduction after dental restoration (SG-1) compared with the DL irradiation used prior to restoration placement (SG-2)...
October 12, 2016: Lasers in Medical Science
Edna Perez, Linda S Behar-Horenstein, Marcio Guelmann
Children with intellectual and physical disabilities including autism are susceptible to dental trauma as a sequela from falls due to poor muscular coordination. In addition, their altered muscle tonus often results in an open bite with labial flaring of the maxillary incisors and lip incompetence, predisposing these teeth to fractures. This case report describes an alternative approach of restoring a fractured maxillary permanent central incisor with a composite strip crown during surgical repositioning of the periodontium on an autistic patient...
September 1, 2016: Journal of Contemporary Dental Practice
Nello Martiniello, Martina Stefanini, Giovanni Zucchelli
BACKGROUND: In clinical practice it is common to observe adjacent multiple gingival recessions (MGRs) associated with noncarious cervical lesions (NCCLs). The aim of this 2-year case report was to describe the full-mouth treatment of a patient affected by MGRs and NCCLs, with a combined restorative-surgical approach using a coronally advanced flap (CAF) and a xenogeneic collagen matrix (CM). METHOD: Before surgery, a composite restoration filled the deepest portion of the NCCL defects and was finished at the level of the maximum root coverage (MRC)...
2016: International Journal of Esthetic Dentistry
Mario Imburgia, Angelo Canale, Davide Cortellini, Marco Maneschi, Claudio Martucci, Marco Valenti
The esthetic treatment of anterior teeth has always presented a challenge in clinical practice. With the improvement of dental materials, many restorative options such as composite resins, all-ceramic crowns, and ceramic veneers have become available. The current challenge in reconstructive dentistry is to obtain excellent esthetic results while preserving the biological structures involved as much as possible. Thanks to the introduction of high-strength etchable dental ceramics, clinicians and technicians have materials and procedures at their disposal that allow them to restore esthetics and function through a minimally invasive approach...
2016: International Journal of Esthetic Dentistry
Piyaphong Panpisut, Saad Liaqat, Eleni Zacharaki, Wendy Xia, Haralampos Petridis, Anne Margaret Young
PURPOSE: This study developed light cured dental composites with added monocalcium phosphate monohydrate (MCPM), tristrontium phosphate (TSrP) and antimicrobial polylysine (PLS). The aim was to produce composites that have enhanced water sorption induced expansion, can promote apatite precipitation and release polylysine. MATERIALS AND METHODS: Experimental composite formulations consisted of light activated dimethacrylate monomers combined with 80 wt% powder. The powder phase contained a dental glass with and without PLS (2...
2016: PloS One
Stevan M Cokic, Peter Hoet, Lode Godderis, Martin Wiemann, Christof Asbach, Franz X Reichl, Jan De Munck, Bart Van Meerbeek, Kirsten L Van Landuyt
INTRODUCTION: Previous research revealed that during routine abrasive procedures like polishing, shaping or removing of composites, high amounts of respirable dust particles (<5μm) including nano-sized particles (<100nm) may be released. OBJECTIVE: To determine the cytotoxic potential of composite dust particles on bronchial epithelium cells. METHODS: Composite dust of five commercial composites (one nano-composite, two nano-hybrid and two hybrid composites) was generated following a clinically relevant protocol...
October 7, 2016: Dental Materials: Official Publication of the Academy of Dental Materials
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