Efeito de diferentes unidades fotoativadoras na Dureza Martens, módulo de elasticidade e estabilidade de cor de cimentos resinosos

• Autor(a) principal: Farina, Morgana Fernandes de Freitas [UNESP]
• Data de Publicação: 2017
• Tipo de documento: Trabalho de conclusão de curso
• Idioma: por
• Título da fonte: Repositório Institucional da UNESP
• Texto Completo: http://hdl.handle.net/11449/156766; http://www.athena.biblioteca.unesp.br/exlibris/bd/capelo/2018-06-12/000902068.pdf
• topic: Fotoiniciadores dentários; Cura luminosa de adesivos dentários; Cimentos dentários; Photoinitiators, Dental

Resin cements are constantly evolving and are indicated for several clinical situations, among them esthetic dentistry. Therefore, the objective of this study was to evaluate Martens hardness, modulus of elasticity and color stability of resin cements photopolymerized by two types of LED before and after accelerated artificial aging. Two resin cements with different photoinitiators were used: RelyX-Veneer, light-curing, translucent color (3M ESPE) and Variolink II, dual, base paste, transparent color (IvoclarVivadent). Eighty specimens were prepared, being (n = 40) for each resin cement, measuring 5mm in diameter and 1,5mm in thickness. Half of the disks were photopolymerized by a Singlewave LED (Radii-cal, SDI) and the other half by a Polywave LED (Valo, Ultradent), following manufacturers' recommendations. After preparation, the specimens were stored at 37 ° C and 100% relative humidity for 24 hours to ensure complete polymerization. Initial evaluations of Martens hardness, modulus of elasticity and color analysis were performed. The specimens were then exposed to the challenge of accelerated artificial aging. Then, final evaluations of Martens hardness, modulus of elasticity and color analysis were done. Color stability data (ΔE), Martens hardness (MPa) and modulus of elasticity (GPa) were subjected to the normality test (Shapiro-Wilk) and homogeneity of variance. The color stability data (ΔE) were submitted to two-way ANOVA. The Martens hardness data (MPa) and modulus of elasticity (GPa) were subjected to three-way ANOVA. Tukey's post-test was used to compare the means (α = 0.05). The results showed that, in relation to color stability (ΔE), there was no statistically significant difference between the studied materials, as well as among the photopolymerizers used (p>0.05). In relation to the mechanical properties...