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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
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
Elisabeth Dursun, Hélène Fron-Chabouis, Jean-Pierre Attal, Anne Raskin
BACKGROUND: Bisphenol A (BPA) is an endocrine disruptor with potential toxicity. Composite resins may not contain pure BPA, but its derivatives are widely used. Several studies found doses of BPA or its derivatives in saliva or urine of patients after composite resin placement. OBJECTIVE: The aims of this study were to establish an exhaustive list of composite resins marketed in Europe and their composition, and to assess the extent of BPA derivatives used. METHODS: A research on manufacturers' websites was performed to reference all composite resins marketed in Europe, then their composition was determined from both material safety data sheets and a standardized questionnaire sent to manufacturers...
2016: Open Dentistry Journal
Mariem Bouzrati-Zerelli, Maximilian Maier, Celine Dietlin, Morlet-Savary Fabrice, Jean Pierre Fouassier, Joachim E Klee, Jacques Lalevée
OBJECTIVES: The aim of our study is to find an amine free photoinitiating system (PIS) for the polymerization of representative dental methacrylate resins. A photoinitiating system (PIS) based on camphorquinone (CQ)/triphenylgermanium hydride/diphenyl iodonium hexafluorophosphate is proposed and compared to the conventional CQ/amine couple. The polymerization monitoring of thin (∼20μm) and thick (1.4mm) samples of a bisphenol A-glycidyl methacrylate (Bis-GMA)/triethyleneglycol dimethacrylate (TEGDMA) blend (70%/30% w/w) and of a urethane dimethacrylate (UDMA) upon exposure to a commercial blue LED centered at 477nm under air or in laminate is described...
October 2016: Dental Materials: Official Publication of the Academy of Dental Materials
Philip D Taylor, Georgios Georgakis, Jason Niggli
Three methods of direct provisional crown construction were investigated for accuracy of marginal fit. A modified proprietary crown coping was compared to Bis GMA and isobutyl methacrylate resin provisional crowns with margins modified by using a flowable composite and 'bead on' isobutyl methacrylate respectively. Measurement was at 50x magnification at seven sites over the fit surface. Data was analyzed using SPSS version 13.0.1 and measurement compared using the Mann Whitney test set at a significance level of 0...
June 2016: European Journal of Prosthodontics and Restorative Dentistry
Felipe Weidenbach Degrazia, Vicente Castelo Branco Leitune, Antonio Shigueaki Takimi, Fabrício Mezzomo Collares, Salvatore Sauro
OBJECTIVE: This study aimed to assess the degree of conversion, microhardness, solvent degradation, contact angle, surface free energy and bioactivity (e.g., mineral precipitation) of experimental resin-based materials containing, pure or triclosan-encapsulated, aluminosilicate-(halloysite) nanotubes. METHODS: An experimental resin blend was prepared using bis-GMA/TEGDMA, 75/25wt% (control). Halloysite nanotubes (HNT) doped with or without triclosan (TCN) were first analyzed using transmission electron microscopy (TEM)...
September 2016: Dental Materials: Official Publication of the Academy of Dental Materials
Sebastian Wille, Iris Hölken, Galina Haidarschin, Rainer Adelung, Matthias Kern
OBJECTIVE: The aim of this study was to evaluate whether the mechanical properties of the modern dental composites can be improved by using tetrapodal ZnO particles as fillers in a Bis-GMA/TEGDMA matrix. Another aim was to test whether the mechanical properties of the composite are influenced by functionalization of the ZnO particles with lauric acid to achieve antibacterial activity. METHODS: Different filler materials and particle shapes (spherical zirconia, spherical zinc oxide, tetrapodal zinc oxide) were used to produce Bis-GMA/TEGDMA based composites with a filler content of 40wt...
September 2016: Dental Materials: Official Publication of the Academy of Dental Materials
Maya Grigorievna Lyapina, Maria Dencheva, Assya Krasteva-Panova, Mariana Tzekova-Yaneva, Mariela Deliverska, Angelina Kisselova-Yaneva
BACKGROUND: A multitude of methacrylic monomers is used in dentistry. Glutaraldehyde (G) is used in dental practice and consumer products as a broad-spectrum antimicrobial agent. The purpose of our study is to evaluate the frequency and the risk of concomitant sensitization to some methacrylic monomers (methyl methacrylate (MMA), triethyleneglycol dimethacrylate (TEGDMA), ethyleneglycol dimethacrylate (EGDMA), 2,2-bis-[4-(2-hydroxy-3-methacrylo-xypropoxy)phenyl]-propane (Bis-GMA), 2-hydroxy-ethyl methacrylate (2-HEMA) and tetrahydrofurfuryl methacrylate (THFMA)) and glutaraldehyde in students of dentistry, students from the dental technician school, dental professionals and dental patients...
2016: Medycyna Pracy
Parisa Saen, Mohammad Atai, Azizollah Nodehi, Laleh Solhi
OBJECTIVE: The aim of this study was to evaluate the mechanical properties of dental resins and dental nanocomposites by means of 3-point bending, 4-point bending and piston-on-three ball biaxial static tests and also to investigate their dynamic mechanical properties. The obtained results from the static 3-point bending test also were compared with the corresponding mode in DMTA. METHODS: The hydrophilic surface of the inorganic OX-50 particles was treated with γ-MPS and the resulting silanized OX-50 was characterized using FTIR and TGA...
August 2016: Dental Materials: Official Publication of the Academy of Dental Materials
Esther Hope, Dana R Reed, Lori H Moilanen
OBJECTIVES: In the published literature, a variety of analytical methods have been used to quantify and report bisphenol A (BPA) release from dental resins. The objective of this study was to compare results obtained for quantification of BPA in dental resin extracts using an LC/UV analytical method and an LC/MS/MS method. METHODS: A cured Bis-GMA-based resin representative of commercial dental products was extracted according to ISO 10993 guidelines for medical devices...
August 2016: Dental Materials: Official Publication of the Academy of Dental Materials
Hani Nassar, Tien-Min Chu, Jeffrey Platt
The use of a free-radical polymerization inhibitor, butylhydroxytoluene (BHT), and a common photo-initiator, camphorquinone (CQ), to reduce polymerization stress in dental composite was investigated in this study. Samples were prepared by mixing Bis-GMA, UDMA, and TEGDMA at a 1:1:1 ratio (wt%), and silanized borosilicate glass fillers at 70 wt% were added to form the composite. Sixteen groups of resin composite were prepared using combinations of four CQ (0.1%, 0.5%, 1.0%, and 1.5%) and four BHT (0.0%, 0.5%, 1...
May 20, 2016: Brazilian Oral Research
Guilherme Carpena Lopes, Ana Maria Spohr, Grace M De Souza
PURPOSE: To evaluate the effect of different bonding strategies on short- and long-term bis-GMA-based resin cement bond strengths to zirconia. MATERIALS AND METHODS: One hundred twenty samples of fully-sintered zirconia (Prettau Zirconia) were sandblasted and randomly distributed into 5 groups (n = 24): UA: Scotchbond Universal Adhesive; SZP: Signum Zirconia Bond I + II; ZPP: Z-Prime Plus; EXP: MZ experimental primer; CO: no primer application (control). After performing these surface treatments, translucent tubes (0...
2016: Journal of Adhesive Dentistry
Daphne Câmara Barcellos, Beatriz Maria Fonseca, César Rogério Pucci, Bruno das Neves Cavalcanti, Erasmo De Souza Persici, Sérgio Eduardo de Paiva Gonçalves
OBJECTIVE: This study assessed a 6 month resin/dentin bond's durability and cytotoxic effect of Zn-doped model dentin adhesives. The mechanical and physicochemical properties were also tested. METHODS: A model etch-and-rinse single-bottle adhesive was formulated (55wt.% Bis-GMA, 45wt.% HEMA, 0.5wt.% CQ, 0.5wt.% DMAEMA) and Zinc methacrylate (Zn-Mt) or ZnO nanoparticles (ZnOn) were added to the model's adhesive, resulting in three groups: Group Control (control model adhesive); Group Zn-Mt (1wt...
July 2016: Dental Materials: Official Publication of the Academy of Dental Materials
Sunantha Selvaraj, Jayachandran Dorairaj, Jayashree Mohan, Paul Simon
INTRODUCTION: An accurate and passive fit of implant framework prosthesis, as well as the successful surgical operation is suggested as one of the critical requirements for long-term implant success. OBJECTIVE: The purpose of this in vitro study was to evaluate the accuracy of the master cast using open tray impression technique with conventional and novel splinting materials. METHODOLOGY: A mandibular reference model with four ADIN implants was done...
April 2016: Journal of Indian Prosthodontic Society
Sheen Juneja Arora, Aman Arora, Viram Upadhyaya, Shilpi Jain
BACKGROUND OR STATEMENT OF PROBLEM: As, the longevity of provisional restorations is related to, a perfect adaptation and a strong, long-term union between restoration and teeth structures, therefore, evaluation of marginal leakage of provisional restorative materials luted with cements using the standardized procedures is essential. AIMS AND OBJECTIVES: To compare the marginal leakage of the provisional crowns fabricated from Autopolymerizing acrylic resin crowns and bisphenol A-glycidyl dimethacrylate (BIS-GMA) resin crowns...
January 2016: Journal of Indian Prosthodontic Society
Ankita Piplani, M C Suresh Sajjan, A V Ramaraju, Tushar Tanwani, G Sushma, G Ganathipathi, K Jagdish, Anil Agrawal
STATEMENT OF PROBLEM: The provisional restorative materials in fixed prosthodontics are basically bis-GMA resins which releases exothermic temperature while polymerization which can damage the pulp. Intrapulpal temperature exceeding 42.5°C found to result in irreversible damage to the pulp. The remaining thickness of dentine after tooth preparation control the conduction of heat released by the resins. PURPOSE: (1) To quantify the temperature changes in the pulp chamber using different provisional restorative materials...
January 2016: Journal of Indian Prosthodontic Society
Johannes Steinhaus, Berenika Hausnerova, Thomas Haenel, Daniela Selig, Fabian Duvenbeck, Bernhard Moeginger
OBJECTIVE: Shear viscosity and ion viscosity of uncured visible light-curing (VLC) resins and resin based composites (RBC) are correlated with respect to the resin composition, temperature and filler content to check where Dielectric Analysis (DEA) investigations of VLC RBC generate similar results as viscosity measurements. METHODS: Mixtures of bisphenol A glycidyl methacrylate (Bis-GMA) and triethylene glycol dimethacrylate (TEGDMA) as well as the pure resins were investigated and compared with two commercial VLC dental resins and RBCs (VOCO, Arabesk Top and Grandio)...
July 2016: Dental Materials: Official Publication of the Academy of Dental Materials
Y C Luo, S Sun, Y H Xiao
OBJECTIVE: To study the effect of hyperbranched polyester(HBP)on mechanical properties of the conventional resin matrix. METHODS: Two hyperbranched monomers(HBP2-X and HBP2-Y)were synthesized and incorporated at 40%(by mass)into a 2∶1(by mass)bisphenol-A diglycidyl methacrylate(Bis-GMA): triethylene glycol dimethacrylate(TEGDMA)resin. Bis-GMA/TEGDMA without the incorporation of hyperbranched polyester was used as control(n=8 per group). The mechanical properties of the modified neat resin, including polymerization volumetric shrinkage, Vickers hardness, water absorption and dissolution rate, as well as the flexural strength, compressive strength and diametral tensile strength of the composite resin with different content of filler(0%, 30%, 50%, 70%)were measured...
April 9, 2016: Zhonghua Kou Qiang Yi Xue za Zhi, Zhonghua Kouqiang Yixue Zazhi, Chinese Journal of Stomatology
Nancy N Maserejian, Felicia L Trachtenberg, Olivia Brown Wheaton, Antonia M Calafat, Gayatri Ranganathan, Hae-Young Kim, Russ Hauser
BACKGROUND: Bisphenol A-glycidyl methacrylate (bis-GMA)-based dental composite restorations may release bisphenol A (BPA). The authors assessed changes in urinary BPA concentrations over a 6-month follow-up period in children and adolescents who received bis-GMA-based restorations. METHODS: The authors collected data from 91 study participants aged 3 to 17 years who needed composite restorations. Participants provided urine samples and information on BPA-related exposures before and at approximately 1 day, 14 days, and 6 months after treatment...
August 2016: Journal of the American Dental Association
Carine T W Meereis, Fernanda B Leal, Fabrício A Ogliari
OBJECTIVES: This study simulated the shelf life to evaluate the stability of initiation systems on acidic photopolymerizable dental material, through an experimental self-adhering flowable composite resin (SACR). METHODS: An SACR model was formulated with monomers Bis-GMA, TEGDMA, acidic monomer (GDMA-P), and inorganic fillers. Initiation system combinations of camphorquinone (CQ), tertiary amine (EDAB), diphenyl phosphine oxide (TPO), phenylbis phosphine oxide (BAPO), and the diphenyliodonium hexafluorophosphate (DPIHFP) were tested...
July 2016: Dental Materials: Official Publication of the Academy of Dental Materials
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