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https://www.readbyqxmd.com/read/29343187/mechanical-and-antibacterial-properties-of-benzothiazole-based-dental-resin-materials
#1
Wenbin Zhu, Chonghui Lao, Shuzhen Luo, Fang Liu, Qiting Huang, Jingwei He, Zhengmei Lin
A synthesized benzothiazole containing mono-methacrylate monomer BTTMA was incorporated into Bis-GMA/TEGDMA dental resin system with a series of mass concentration from 5 wt.% to 30 wt.% as an antibacterial agent. The influence of BTTMA on physicochemical properties of dental resin system, such as double bond conversion (DC), volumetric shrinkage (VS), flexural strength (FS) and modulus (FM), water sorption (WS) and solubility (SL) were investigated. Direct contact testing and agar diffusion testing were used to evaluate the antibacterial activity of BTTMA containing dental resin...
January 17, 2018: Journal of Biomaterials Science. Polymer Edition
https://www.readbyqxmd.com/read/29183672/bisphenol-a-release-from-an-orthodontic-resin-composite-a-gc-ms-and-lc-ms-study
#2
Marc Deviot, Isabelle Lachaise, Christof Högg, Jürgen Durner, Franz-Xaver Reichl, Jean-Pierre Attal, Elisabeth Dursun
OBJECTIVES: First, to analyse the in vitro release of BPA and Bis-GMA from an orthodontic resin composite (Transbond XT, 3M Unitek), stored in various conditions, by gas chromatography/mass spectrometry (GC/MS) and liquid chromatography/mass spectrometry (LC/MS); then to extrapolate the data to the clinical situation. Secondly, to explore the thermal stability of Bis-GMA. METHODS: Cylinders of resin composite were prepared and stored according to 3 different protocols: (1) they were light-cured 20s, then placed in artificial saliva; (2) they were light-cured 2s, then placed in acetonitrile; (3) they were light-cured 2s, then placed in methanol...
November 25, 2017: Dental Materials: Official Publication of the Academy of Dental Materials
https://www.readbyqxmd.com/read/29173028/easy-debonding-of-ceramic-brackets-bonded-with-a-light-cured-orthodontic-adhesive-containing-microcapsules-with-a-co2-laser
#3
Shiori Arima, Yasuhiro Namura, Takahiko Tamura, Noriyoshi Shimizu
OBJECTIVE: An easy debonding method for ceramic brackets using a light-cured Bis-GMA resin containing heat-expandable microcapsules and CO2 laser was investigated. BACKGROUND: Ceramic brackets are used frequently in orthodontic treatment because of their desirable esthetic properties. However, the application of heavy force to ceramic brackets in debonding can fracture the tooth enamel and ceramic brackets, causing tooth pain. MATERIALS AND METHODS: In total, 60 freshly extracted bovine permanent mandibular incisors were divided randomly into 10 groups of 6 specimens each, corresponding to the number of variables tested...
November 27, 2017: Photomedicine and Laser Surgery
https://www.readbyqxmd.com/read/29113700/high-performance-dental-resin-composites-with-hydrolytically-stable-monomers
#4
Xiaohong Wang, George Huyang, Sri Vikram Palagummi, Xiaohui Liu, Drago Skrtic, Carlos Beauchamp, Rafael Bowen, Jirun Sun
OBJECTIVE: The objectives of this project were to: 1) develop strong and durable dental resin composites by employing new monomers that are hydrolytically stable, and 2) demonstrate that resin composites based on these monomers perform superiorly to the traditional bisphenol A glycidyl dimethacrylate/triethylene glycol dimethacrylate (Bis-GMA/TEGDMA) composites under testing conditions relevant to clinical applications. METHODS: New resins comprising hydrolytically stable, ether-based monomer, i...
November 4, 2017: Dental Materials: Official Publication of the Academy of Dental Materials
https://www.readbyqxmd.com/read/29048706/assessment-of-monomer-release-from-3-different-fissure-sealants
#5
K Görkem Ulu Güzel, Işıl Sönmez
BACKGROUND: Light-activated resin-based dental fissure sealants are the most widely accepted among clinicians. The objective of this study was to determine monomer release of 3 different light-curing fissure sealants in vitro: Control Seal (Voco, Germany), Fissurit FX (Voco, Germany) and R&D Series Fıssured Nova (Imicrly, Turkey). METHODS: Each material was polymerized with a curing light: Valo Cordless (Ultradent) LED in standard mode for 20 seconds (n = 27) and 40 seconds (n = 27) and in Xtra power mode (plasma arc) for 3 seconds (n = 27)...
October 18, 2017: Journal of Applied Biomaterials & Functional Materials
https://www.readbyqxmd.com/read/29028596/synthesis-characterization-and-evaluation-of-a-fluorinated-resin-monomer-with-low-water-sorption
#6
Xue Liu, Zengyao Wang, Chengji Zhao, Wenhuan Bu, Yurong Zhang, Hui Na
A fluorinated acrylate monomer (4-TF-PQEA) without BPA (bisphenol-A) structure was synthesized and mixed with triethylene glycol dimethacrylate (TEGDMA) to used as dental resin system in order to achieve lower water sorption and reduce human exposure to BPA derivatives. Double bond conversion (DC) was measured using Fourier transform infrared spectroscopy (FTIR). Water sorption (WS), water solution (WL) and depth of cure (DOC) were evaluated according to ISO 4049:2009. Water contact angle (CA) was measured using contact angle analyzer...
September 21, 2017: Journal of the Mechanical Behavior of Biomedical Materials
https://www.readbyqxmd.com/read/28944375/influence-of-different-calcium-phosphates-on-an-experimental-adhesive-resin
#7
Isadora Martini Garcia, Vicente Castelo Branco Leitune, Susana Maria Werner Samuel, Fabrício Mezzomo Collares
PURPOSE: To formulate adhesive resins with 2 wt% of hydroxyapatite (HAp), α-tricalcium phosphate (α-TCP), or octacalcium phosphate (OCP) and to compare these groups with an unfilled adhesive regarding the degree of conversion, polymerization rate, microshear bond strength and mineral deposition. MATERIALS AND METHODS: The experimental adhesive resin was formulated mixing 66.6 wt% bisphenol A glycol dimethacrylate (bis-GMA), 33.3 wt% 2-hydroxyethyl methacrylate (HEMA), and a photoinitiator system...
September 21, 2017: Journal of Adhesive Dentistry
https://www.readbyqxmd.com/read/28877280/mechanical-properties-water-sorption-characteristics-and-compound-release-of-grape-seed-extract-incorporated-resins
#8
Don Jeevanie Epasinghe, Cynthia Kar Yung Yiu, Michael Francis Burrow
Objective: This study evaluated the effect of grape seed extract (GSE) incorporation on the mechanical properties, water sorption, solubility, and GSE release from the experimental adhesive resins. Material and Methods: An experimental comonomer mixture, consisting of 40% Bis-GMA, 30% Bis MP, 28% HEMA, 0.26% camphorquinone and 1% EDMAB, was used to prepare four GSE-incorporated adhesive resins at concentrations of 0.5, 1, 1.5, and 2 wt%. The neat resin without GSE was used as the control...
July 2017: Journal of Applied Oral Science: Revista FOB
https://www.readbyqxmd.com/read/28747595/nac-ameliorates-dental-composite-induced-dna-double-strand-breaks-and-chromatin-condensation
#9
Panorea Styllou, Marianthi Styllou, Reinhard Hickel, Christof Högg, Franz Xaver Reichl, Harry Scherthan
Released (co)monomers from dental composite components can induce DNA damage of which DNA double-strand breaks (DSBs) threaten genome integrity. Here, we tested whether the administration of the antioxidant N-acetylcysteine (NAC) is able to reduce the dental composite-induced DSBs in primary human gingiva fibroblasts. The dental composites Bis-GMA (bisphenol-A-glycerolate dimethacrylate), GMA (glycidyl methacrylate), HEMA (2-hydroxyethyl methacrylate) and TEGDMA (triethyleneglycol dimethacrylate) were found to induce co-localizing microscopic nuclear foci numbers of the DSB markers γ-H2AX and 53BP1 per cell in the order: GMA>Bis-GMA>TEGDMA>HEMA...
July 26, 2017: Dental Materials Journal
https://www.readbyqxmd.com/read/28618330/improvements-in-self-curing-composites
#10
Zbigniew Raszewski, Marek Jałbrzykowski
PURPOSE: The purpose of this study was to test the influence of a barbituric acid derivative acting as a catalyst and small amounts of pyrolytic silica in acrylic resins on color stability, solubility and sorption of a composite. MATERIALS AND METHODS: A series of two-component powder/liquid resin systems were prepared. Monomer-like mixtures (bis-GMA, TEGDMA, tertiary amine 60/40) and a quartz powder with additions of various silica and barbituric acid derivatives were used...
September 2017: Advances in Medical Sciences
https://www.readbyqxmd.com/read/28576003/correlating-cytotoxicity-to-elution-behaviors-of-composite-resins-in-term-of-curing-kinetic
#11
Junquan Meng, Huichuan Yang, Man Cao, Lei Li, Qing Cai
Cytotoxicity of photocurable composite resins is a key issue for their safe use in dental restoration. Curing kinetic and elution behaviors of the composite resin would have decisive effects on its cytotoxicity. In this study, composite resins composed of bisphenol-glycidyl dimethacrylate (Bis-GMA), triethyleneglycol dimethacrylate (TEGDMA), camphorquinone (CQ), N,N-dimethylaminoethyl methacrylate (DMAEMA) and barium glass powders were prepared by setting the photoinitiators CQ/DMAEMA at 0.5wt%, 1wt% or 3wt% of the total weight of Bis-GMA/TEGDMA...
September 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28571259/comparative-evaluation-of-two-bis-gma-based-orthodontic-bonding-adhesives-a-randomized-clinical-trial
#12
Christine Samantha, Shantha Sundari, Shyamala Chandrasekhar, Gautham Sivamurty, Saravana Dinesh
INTRODUCTION: Of the various orthodontic bonding materials, orthofix is a fairly new entrant into this field. This material was exclusively introduced for orthodontic bonding purposes; however, the application of this material for orthodontic purpose has not been scientifically evaluated so far. AIM: The aim of the present study was to evaluate by an in-vivo double blinded split mouth rando mized clinical trial, the overall bond failure rates of two Bis-GMA based composite materials namely Transbond XT and Orthofix...
April 2017: Journal of Clinical and Diagnostic Research: JCDR
https://www.readbyqxmd.com/read/28554609/biofilm-induced-changes-to-the-composite-surface
#13
Ivana Nedeljkovic, Jan De Munck, Andreea-Alexandra Ungureanu, Vera Slomka, Carmen Bartic, Anja Vananroye, Christian Clasen, Wim Teughels, Bart Van Meerbeek, Kirsten L Van Landuyt
OBJECTIVES: Composites may undergo biodegradation in the oral cavity. The objective was to investigate the effect of single- and multi-species biofilms on the surface roughness and topography of two composites. METHODS: Disk-shaped specimens of a paste-like, Bis-GMA-free (Gradia Direct Anterior, GC), and a flowable, Bis-GMA-based composite (Tetric EvoFlow, Ivoclar-Vivadent) were prepared. After ethylene-oxide sterilization (38°C), specimens (n=3) were incubated with Streptococcus mutans or mixed bacterial culture (Streptococcus mutans, Streptococcus sanguinis, Actinomyces naeslundii and Fusobacterium nucleatum)...
May 26, 2017: Journal of Dentistry
https://www.readbyqxmd.com/read/28513783/influence-of-addition-of-2-methacryloyloxy-ethyl-trimethylammonium-chloride-to-an-experimental-adhesive
#14
Fabrício Mezzomo Collares, Vicente Castelo Branco Leitune, Patrícia Franken, Clarissa Fatturi Parollo, Fabrício Aulo Ogliari, Susana Maria Werner Samuel
The aim of this study was to develop an experimental adhesive with addition of [2-(methacryloyloxy)ethyl]trimethylammonium chloride (METAC) and to evaluate its mechanical and biological properties and its in vitro antibacterial activity. An experimental adhesive resin was formulated with Bis-GMA, TEGDMA, and HEMA. The antibacterial monomer was added at concentrations of 1%, 2.5%, and 5% (METAC groups). A group without METAC addition was used as control. The experimental adhesives were evaluated as to their antibacterial potential against Streptococcus mutans, degree of conversion, and softening in ethanol for 2 hours...
May 4, 2017: Brazilian Oral Research
https://www.readbyqxmd.com/read/28408957/development-of-technique-for-in-vitro-embryotoxicity-of-dental-biomaterials
#15
REVIEW
Koichi Imai
The Embryonic Stem Cell Test (EST) developed in Germany in 1997 is known as a screening test method capable of predicting the presence of unknown chemicals influencing normal human development. Firstly, we investigated the embryotoxicity of 24 types of monomer including dental monomers and dental alloy-component metal elements using this test. Monomers including Bis-GMA contained in base resin of composite resin exhibited weak embryotoxicity, and the toxicity level varied among dental alloy-component metal elements...
August 2016: Japanese Dental Science Review
https://www.readbyqxmd.com/read/28387166/multi-scale-analysis-of-the-effect-of-nano-filler-particle-diameter-on-the-physical-properties-of-cad-cam-composite-resin-blocks
#16
Satoshi Yamaguchi, Sayuri Inoue, Takahiko Sakai, Tomohiro Abe, Haruaki Kitagawa, Satoshi Imazato
The objective of this study was to assess the effect of silica nano-filler particle diameters in a computer-aided design/manufacturing (CAD/CAM) composite resin (CR) block on physical properties at the multi-scale in silico. CAD/CAM CR blocks were modeled, consisting of silica nano-filler particles (20, 40, 60, 80, and 100 nm) and matrix (Bis-GMA/TEGDMA), with filler volume contents of 55.161%. Calculation of Young's moduli and Poisson's ratios for the block at macro-scale were analyzed by homogenization. Macro-scale CAD/CAM CR blocks (3 × 3 × 3 mm) were modeled and compressive strengths were defined when the fracture loads exceeded 6075 N...
May 2017: Computer Methods in Biomechanics and Biomedical Engineering
https://www.readbyqxmd.com/read/28209008/effect-of-resin-bonded-luting-agents-influencing-marginal-discrepancy-in-all-ceramic-complete-veneer-crowns
#17
Dhanraj Ganapathy, Anusha Sathyamoorthy, Hemalatha Ranganathan, Karthikeyan Murthykumar
INTRODUCTION: Marginal discrepancy severely affects the long term success of All ceramic complete veneer crowns. The precise role of resin luting agents influencing this phenomenon needs to be explored further. AIM: To estimate and compare the marginal discrepancy in CAD/CAM processed All ceramic complete veneer crowns prior and following luting with resin bonded luting agents. MATERIALS AND METHODS: Extracted human maxillary first premolars were randomly allocated into four groups of 27 samples each Viz...
December 2016: Journal of Clinical and Diagnostic Research: JCDR
https://www.readbyqxmd.com/read/28122255/synthesis-and-characterization-of-a-novel-resin-monomer-with-low-viscosity
#18
Lihua Hong, Yu Wang, Lin Wang, Hong Zhang, Hui Na, Zhimin Zhang
OBJECTIVE: In this study, we designed and synthesized a novel macromolecule (tetramethyl bisphenol F acrylate, TMBPF-Ac) with low viscosity, excellent mechanical properties, and good biocompatibility. It could be used as a monomer for dental resin composites, which could reduce the risk of human exposure to bisphenol A derivatives in the oral environment. In addition, the monomer could be used without diluent, thereby avoiding the negative effect of a diluent METHODS: TMBPF-Ac was synthesized by a multistep condensation reaction...
January 22, 2017: Journal of Dentistry
https://www.readbyqxmd.com/read/28024577/novel-urethane-based-polymer-for-dental-applications-with-decreased-monomer-leaching
#19
Gedalias C Martim, Carmem S Pfeifer, Emerson M Girotto
The aim of this study was to synthesize and characterize new multifunctional-urethane-methacrylate monomers to be used as the organic matrix in restorative dental composites, and evaluate the main physical-chemical properties of the resulting material. Bis-GMA (bisphenol-A-diglycidylmethacrylate) and GDMA (glycerol dimethacrylate) were modified by reacting the hydroxyl groups with isocyanate groups of urethane-methacrylate precursors to result in the new monomeric systems U-(bis-GMA)-Mod and U-(GDMA)-Mod, U=Urethane and Mod=Modified...
March 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28007395/preparation-and-characterization-of-high-radio-opaque-e-glass-fiber-reinforced-composite-with-iodine-containing-methacrylate-monomer
#20
Jingwei He, Pekka K Vallittu, Lippo V Lassila
OBJECTIVE: The purpose of this study was to prepare radio-opaque E-glass fiber-reinforced composite (EFRC) with synthesized iodine containing methacrylate monomer. METHODS: The synthesized iodine containing methacrylate monomer 2-hydroxy-3- methacryloyloxypropyl(2,3,5- triiodobenzoate) (HMTIB) was mixed with Bis-GMA and MMA in different mass ratio to prepare resin impregnating solution (RIS), and RIS without HMTIB was used as control. CQ and DMAEMA were added as photoinitiation system...
December 19, 2016: Dental Materials: Official Publication of the Academy of Dental Materials
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