Degree of conversion and residual stress of preheated and room-temperature composites

Abstract

The aim of this study was to determine the degree of conversion and residual stress of resin composite preheated to different temperatures and to compare it to room-temperature composite. The composite resin was preheated to 40°C, 50°C, and 60°C and packed into brass rings and light-cured. The degree of conversion and residual stress were analysed using Fourier transform infra-red spectroscopy and X-ray diffraction, respectively. The results obtained were tabulated and statistically analyzed using Kruskal-Wallis test and Tukey′s honestly significantly different test. The results showed significant increase in the degree of conversion and residual stress with increase in preheating temperature.