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https://www.readbyqxmd.com/read/27916947/preparation-of-a-bis-gma-free-dental-resin-system-with-synthesized-fluorinated-dimethacrylate-monomers
#1
Shuzhen Luo, Wenbin Zhu, Fang Liu, Jingwei He
With the aim of reducing human exposure to Bisphenol A (BPA) derivatives in dentistry, a fluorinated dimethacrylate monomer was synthesized to replace 2,2-bis[4-(2-hydroxy-3-methacryloy-loxypropyl)-phenyl]propane (Bis-GMA) as the base monomer of dental resin. After mixing with reactive diluent triethyleneglycol dimethacrylate (TEGDMA), fluorinated dimethacrylate (FDMA)/TEGDMA was prepared and compared with Bis-GMA/TEGDMA in physicochemical properties, such as double bond conversion (DC), volumetric shrinkage (VS), water sorption (WS) and solubility (WSL), flexural strength (FS) and modulus (FM)...
December 1, 2016: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/27875051/clinical-significance-of-bis-gma-and-hema-orthodontic-resins-bonding-to-enamel-and-ceramic-materials
#2
Timothy Reichheld, Gregory Monfette, Ronald D Perry, Matthew Finkelman, Eric Gheewalla, Gerard Kugel
The advancement of new ceramic materials for dental crowns has prompted the need for improved methods of bonding orthodontic brackets to these surfaces. Currently, lithium-disilicate is the primary material being used for anterior crowns, while zirconia is the primary material being used in the posterior. The purpose of this study was to compare the shear bond strength of HEMA (Assure® Universal Bonding Resin) and bis-GMA (Assure® PLUS All Surface Bonding Resin) orthodontic bonding resins on enamel, lithium-disilicate, and zirconia materials...
November 2016: Compendium of Continuing Education in Dentistry
https://www.readbyqxmd.com/read/27829758/in-vitro-comparative-evaluation-of-mechanical-properties-of-temporary-restorative-materials-used-in-fixed-partial-denture
#3
D Saisadan, P Manimaran, P K Meenapriya
INTRODUCTION: Materials used to fabricate provisional restorations can be classified as acrylics or resin composites. Provisional crows can be either prefabricated or custom made. ACRYLICS: These materials have been used to fabricate provisional restorations since the 1930s and usually available as powder and liquid. They are the most commonly used materials today for both single-unit and multiple-unit restorations. In general, their popularity is due to their low cost, acceptable esthetics, and versatility...
October 2016: Journal of Pharmacy & Bioallied Sciences
https://www.readbyqxmd.com/read/27794149/microleakage-of-glass-ionomer-based-provisional-cement-in-cad-cam-fabricated-interim-crowns-an-in-vitro-study
#4
Ra'fat I Farah, Naji Al-Harethi
AIM: The aim of this study was to compare in vitro the marginal microleakage of glass ionomer-based provisional cement with resin-based provisional cement and zinc oxide non-eugenol (ZONE) provisional cement in computer-aided design and computer-aided manufacturing (CAD/CAM)-fabricated interim restorations. MATERIALS AND METHODS: Fifteen intact human premolars were prepared in a standardized manner for complete coverage of crown restorations. Interim crowns for the prepared teeth were then fabricated using CAD/CAM, and the specimens were randomized into three groups of provisional cementing agents (n = 5 each): Glass ionomer-based provisional cement (GC Fuji TEMP LT™), bisphenol-A-glycidyldimethacrylate (Bis-GMA)/ triethylene glycol dimethacrylate (TEGDMA) resin-based cement (UltraTemp® REZ), and ZONE cement (TempBond NE)...
October 1, 2016: Journal of Contemporary Dental Practice
https://www.readbyqxmd.com/read/27790588/evaluation-of-flexural-strength-of-thermocycled-interim-resin-materials-used-in-prosthetic-rehabilitation-an-in-vitro-study
#5
Krishna Kishore Kadiyala, Mohan Krishna Badisa, Gopinadh Anne, Sampath Chowdary Anche, Sandeep Chiramana, Suresh Babu Muvva, Srujana Zakkula, Ravi Rakesh Dev Jyothula
INTRODUCTION: Provisional restoration is an analytical component of fixed prosthodontics serving as a ground plan for the design of fixed dental prosthesis. Flexural strength is critical in case of long standing fixed dental prosthesis, to appreciate success of full mouth rehabilitation cases and temporomandibular joint dysfunction therapies. AIM: The present study was to evaluate the flexural strength of different provisional restorative resins used for prosthetic rehabilitation...
September 2016: Journal of Clinical and Diagnostic Research: JCDR
https://www.readbyqxmd.com/read/27763970/evaluation-of-the-biocompatibility-of-new-fiber-reinforced-composite-materials-for-craniofacial-bone-reconstruction
#6
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
https://www.readbyqxmd.com/read/27745776/composite-resin-reinforced-with-silver-nanoparticles-laden-hydroxyapatite-nanowires-for-dental-application
#7
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
https://www.readbyqxmd.com/read/27708726/bisphenol-a-release-survey-of-the-composition-of-dental-composite-resins
#8
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
https://www.readbyqxmd.com/read/27567540/a-novel-photoinitiating-system-producing-germyl-radicals-for-the-polymerization-of-representative-methacrylate-resins-camphorquinone-r3geh-iodonium-salt
#9
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
https://www.readbyqxmd.com/read/27424335/an-investigation-into-the-integrity-of-fit-of-provisional-crowns-using-current-proprietary-temporary-crown-materials
#10
COMPARATIVE STUDY
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
https://www.readbyqxmd.com/read/27393637/physicochemical-and-bioactive-properties-of-innovative-resin-based-materials-containing-functional-halloysite-nanotubes-fillers
#11
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
https://www.readbyqxmd.com/read/27370994/biaxial-flexural-strength-of-new-bis-gma-tegdma-based-composites-with-different-fillers-for-dental-applications
#12
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
https://www.readbyqxmd.com/read/27364105/concomitant-sensitization-to-glutaraldehyde-and-methacrylic-monomers-among-dentists-and-their-patients
#13
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
https://www.readbyqxmd.com/read/27321993/physical-characterization-of-unfilled-and-nanofilled-dental-resins-static-versus-dynamic-mechanical-properties
#14
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
https://www.readbyqxmd.com/read/27257102/potential-confounders-of-bisphenol-a-analysis-in-dental-materials
#15
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
https://www.readbyqxmd.com/read/27223129/optimizing-light-cured-composite-through-variations-in-camphorquinone-and-butylhydroxytoluene-concentrations
#16
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
https://www.readbyqxmd.com/read/27200434/different-strategies-to-bond-bis-gma-based-resin-cement-to-zirconia
#17
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
https://www.readbyqxmd.com/read/27174214/zn-doped-etch-and-rinse-model-dentin-adhesives-dentin-bond-integrity-biocompatibility-and-properties
#18
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
https://www.readbyqxmd.com/read/27141167/comparison-of-implant-cast-accuracy-of-multiple-implant-impression-technique-with-different-splinting-materials-an-in-vitro-study
#19
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
https://www.readbyqxmd.com/read/27134427/comparative-evaluation-of-marginal-leakage-of-provisional-crowns-cemented-with-different-temporary-luting-cements-in-vitro-study
#20
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
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