Sorção, solubilidade e resistência flexural biaxial de uma resina composta em função do tipo de fonte de luz e técnicas de polimerização

• Autor(a) principal: Carvalho, Andreia Assis
• Data de Publicação: 2010
• Tipo de documento: Dissertação
• Idioma: por
• Título da fonte: Repositório Institucional da UFG
• Texto Completo: http://repositorio.bc.ufg.br/tede/handle/tde/2899
• topic: Materiais dentários; Sorção; Solubilidade; Resistência flexural biaxial; Dental materials; Sorption; Solubility; Biaxial flexural strength; CIENCIAS DA SAUDE::ODONTOLOGIA

The use of composite resin (CR) in dental restorations is a common practice, however, in the oral environment, these polymers are subject to hygroscopic and hydrolytic effects, and strength of occlusion and mastication. This study aimed to evaluate in vitro the influence of different light sources, energy densities and polymerization techniques on sorption, solubility and biaxial flexural strength (RFB) of an RC. 240 specimens were fabricated (2mm x 8 MMO) RC (Esthet-X), shade A2. Two groups were obtained, depending on the instrument used: halogen lamp and light emitting diodes (LED) and subdivided according to the energy density (16 J/cm2 and 20 J/cm2), polymerization (conventional pulse I stopped and interrupted pulse II) and type of permeant (water and ethanol 75%). The methodology for the development of sorption and solubility test was based on ISO 4049:2000. Then the specimens were tested for RFB (ASTM F 394-78). We used ANOVA and Tukey test for parametric data and Kruskal-Wallis and Mann-Whitney test for data nãoparamétricos (? = 0.05). It was observed that in general there was no statistically significant differences when comparing the sources of light and the polymerization techniques (p> 0.05). Energy density of 16 J/cm2 and pulse interrupted technique II was possible to observe that the LED generated higher values of sorption and solubility of the halogen light and, in the conventional technique, lower RFB (p> 0.05 ). The ethanol produced higher values of sorption and solubility, and lower RFB compared with water. In general, light sources, energy densities and polymerization techniques did not influence the values of sorption, solubility and RFB