Microtensile bond strength of current adhesive systems when compared to cohesive strength of sound dentin and a resin-based composite

Abstract

Received: March 28, 2004; Revised: September 8, 2004Purpose: To evaluate the microtensile bond strength ( µTBS) to dentin of 4 adhesive systems,the micromorphology of the adhesive/dentin interface and to compare the results to the µTS (co-hesive strength) of sound dentin and resin composite. Occlusal surfaces of 24 extracted caries-freehuman molars were cut flat to expose the dentin surface. They were randomly assigned to 4 groups(n = 6): Adper Scotchbond Multi Purpose Plus (MP), Adper Single Bond (SB), Clearfil ProtectBond (CP) and Adper Prompt (AP). Adhesive systems were applied and “crowns” were builtusing Z100. Other 5 human molars were sectioned to obtain square-shaped dentin blocks and5 resin blocks were built using a composite resin, Z100. After storage in distilled water at 37 °Cfor 24 h, stick-shaped specimens were obtained for all groups (n = 5) with 0.8 mm