Dental Composite Polymerization
Mostrando 1-12 de 34 artigos, teses e dissertações.
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1. Simple and Low-Cost Thermal Treatments on Direct Resin Composites for Indirect Use
Resumo O objetivo deste estudo foi avaliar a influência de três tratamentos térmicos adicionais de baixo custo, disponíveis no consultório dentário, nas propriedades mecânicas, químicas e ópticas de uma resina composta fotoativada indicada para restaurações diretas porém usada como restaurador indireto. A resina composta direta TPH3 (Dentsply) fo
Braz. Dent. J.. Publicado em: 03/06/2019
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2. Composite-derived monomers affect cell viability and cytokine expression in human leukocytes stimulated with Porphyromonas gingivalis
Abstract Objectives: Dental composites release unreacted resin monomers into the oral environment, even after polymerization. Periodontal cells are, therefore, exposed to substances that potentially elicit the immune inflammatory response. The underlying molecular mechanisms associated with the interaction between resin monomers and human immune cells found
J. Appl. Oral Sci.. Publicado em: 03/06/2019
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3. Minimization of polymerization shrinkage effects on composite resins by the control of irradiance during the photoactivation process
Abstract High levels of shrinkage stress caused by volumetric variations during the activation process are one of the main problems in the practical application of composite resins. Objective The aim of this study is to reduce the shrinkage stress and minimize the effects caused by composite resin volumetric variation due to the photopolymerization. In thi
J. Appl. Oral Sci.. Publicado em: 18/06/2018
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4. Polymerization shrinkage stress of composite resins and resin cements – What do we need to know?
Abstract Polymerization shrinkage stress of resin-based materials have been related to several unwanted clinical consequences, such as enamel crack propagation, cusp deflection, marginal and internal gaps, and decreased bond strength. Despite the absence of strong evidence relating polymerization shrinkage to secondary caries or fracture of posterior teeth,
Braz. oral res.. Publicado em: 28/08/2017
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5. Optimizing light-cured composite through variations in camphorquinone and butylhydroxytoluene concentrations
Abstract 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
Braz. oral res.. Publicado em: 20/05/2016
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6. Análise fotoelástica da tensão de contração da polimerização de compósitos resinosos sob influência de técnicas restauradoras / Photoelastic analysis of polymerization shrinkage stress of composites under the influence of restorative techniques
Polymerization shrinkage stress is an undesirable and inevitable characteristic of adhesive restorations. It is important to understand the stress distribution to improve the clinical effectiveness of resin composite restoration. Chapter 1: The aim was to evaluate the polymerization shrinkage stress and degree of conversion of a resin composite material subm
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 20/06/2011
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7. Análise de sistemas de fixação resinosos : por meio de nanoinfiltração, microdureza e microcisalhamento / Analisys of resin luting systems through nanoleakage
During the cementing indirect restorations procedure using resin luting systems, polymerization is essential for an effective clinical outcome of success. The aim of this in vitro study was to evaluate the Knoop hardness (KHN), microshear bond strength (MSBS) and nanoleakage pattern of resin cements and flowable resin to dental enamel. Ninety-two enamel bovi
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 18/03/2011
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8. Efeito da base de cimento de ionômero de vidro modificado por resina e técnicas de inserção de resina composta na interface dentina/restauração adesiva / Effect of resin-modified-glass-ionomer linning and composite placement on adhesive interface
The aim of this study was to evaluate the effect of resin-modified-glassionomer linning and incremental technique on the bond strength of the composite restoration interface. Methods: Cavities were made (4.5mm X 3mm X 5mm) in 52 extracted human molars, divided into 4 groups: Group 1 (control) no linning + two horizontal increments (C Factor = 5); Group 2: no
Publicado em: 2011
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9. Avaliação biomecânica de pré-molares superiores restaurados com diferentes monômeros resinosos / Biomechanical evaluation of pre-molars restored with different monomers resins
O objetivo deste trabalho foi avaliar a viabilidade da utilização de um método de geração de modelo tridimensional de pré-molar superior, com capacidade de representar as tensões de contração de polimerização por meio de analogia térmica com aplicabilidade ao método de elementos finitos. Após isto, neste trabalho avaliou-se o comportamento biom
Publicado em: 2011
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10. Influence of the photoinitiator system and light photoactivation units on the degree of conversion of dental composites
The aim of this study was to observe the influence of two light polymerization units (LED or halogen light) on the degree of conversion (DC) of three dental composites with lighter shades and a different photoinitiator system. The top (T) and bottom (B) surfaces of 60 discs of composite resin (Filtek™ Supreme, Filtek™ Z250, Tetric™ Ceram Bleach) cured
Brazilian Oral Research. Publicado em: 2010-12
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11. Polymerization Shrinkage and Flexural Modulus of Flowable Dental Composites
Linear polymerization shrinkage (LPS), flexural strength (FS) and modulus of elasticity (ME) of low-viscosity resin composites (Admira Flow™, Grandio Flow™/VOCO; Filtek Z350 Flow™/3M ESPE; Tetric Flow™/Ivoclar-Vivadent) was evaluated using a well-established conventional micro-hybrid composite as a standard (Filtek Z250™/3M ESPE). For the measureme
Materials Research. Publicado em: 2010-09
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12. Analysis of polymerization time on abrasive wear of dental resins
An evaluation was made of the abrasive wear of six composite thermofixed dental resins subjected to different polymerization times. The method of evaluation was based on sharpness measurements to quantify the abrasive wear resistance of the resins. To this end, a test bench was built, consisting of a rotating porcelain cylinder that wears out a resin-coated
Materials Research. Publicado em: 2010-03