Avaliação da resistência flexural e módulo de elasticidade de uma resina do tipo bulk fill em comparação com uma resina convencional.

Abstract

To evaluate the flexural strength properties and the elasticity modulus of two nanoparticles composite resins (Filtek Bulk Fill and Filtek Z 350 XT) both from 3M ESPE, St. Paul, MN, USA. The tests were conducted using an Universal testing machine (EMIC), with a 0.5 mm/min speed. It has made 40 sample, those were divided into 4 groups and separated 10 samples for each group. The polymerization was carried out by an LED Emitter curing L (Schuster- SM) with an intensity of 1,200 mW /cm², and an exposure time of 40 seconds. That was used over the both corners, over the center, and over the bottom of the sample. After 24 hours storage in distilled water at 37°C, they were subjected to the flexure test. The obtained values were in MPa and GPa, these submitted to an ANOVA statistical analysis, P <0.05. In this paper, the tested composites have not shown significant differences for the flexural strength, even with the changes suffered in their composition. However, the Elasticity modulus has presented significant differences between the two composites. The Filtek Bulk Fill has showed the higher elastic modulus. The results showed that for the flexural strength, the composite resin Filtek Bulk Fill and Filtek Z 350 XT had no statistically significant differences, but for the Modulus of Elasticity to composite resin Filtek Bulk Fill showed higher elastic modulus than the composite resin Z350 XT.