8 Effect of film thickness and thermal stress on tensile bond strength of adhesive resin cements to dentin

Abstract

We investigated how film thickness (FT) and thermal stress affects the tensile bond strength (IBS) of resin cements to dentin. The resin cements used were Superbond C&B (SB) and Panavia Fluoro Cement (PF). FT was standardized by using a spacer with a hole in it placed on the polished surface of bovine dentin. A resin inlay was bonded with cement to the dentin surface with the spacer in place. The thickness of the spacers were 25, 50, 100, 350 and 1000 μm. TBS was measured after the apparatus was subjected to thermal stress cycling 10,000 times. The thickness of the spacer had no significant effect on TBS for SB. However, there was a significant decrease in TBS for PF at 1000 μm.