Shrinkage Stress of Composite Resin during Hardening : Part II The Effects of Filler Composition on the Shrinkage Stress

Abstract

A composite resin produced by way of trial, with various ratios of microfiller(MF)and, irregular, spherical, polimerized spherical, and glass particle macro filler, was measured the shrinking stress during hardening after filling in the open type cavity.The shrinking stress was increased with higher mixing filler ratio.For the effects of various filler, the irregular particle filler contained resin with a higher filler ratio showed the maximum shrinking stress.Depressions were observed at the central area of all specimens the surface profile after hardening.The shrinkage increased with decreasing filler ratios, which was in proportion to the volumetric ratio of monomer, and no difference was seen among these sorts of fillers.The shrinking stress as well as volumetric and linear shrinkage for the enamel bond should be examined clinically, because the shrinking stress was in inverse proportion to the volumetric shrinkage.