microshear bond strength of different adhesive systems to dentin

Objectives: the aim of this study was to compare the microshear bond strength (μsbs) of various adhesive systems to dentin. materials and methods: in this in vitro experimental study, 60 sound human third molars were divided into four groups. dentin discs were prepared of middle-third dentin measuring 4 mm in diameter and 2 mm in thickness. dentin surfaces were bonded with one of the four types of adhesives: (a) single bond (3m espe), scotchbond universal (3m espe) in etch and rinse (b) and self-etch (c) modes and (d) clearfil se bond (kuraray noritake dental). after the application of adhesive systems according to the manufacturers’ instructions, composite cylinders (vit-l-escence) were bonded to dentin surfaces. the μsbs test was performed using a universal testing machine at a crosshead speed of 1 mm/min. data were analyzed with one-way anova and tukey’s test (α=0.05). results: the μsbs was the highest in self-etch scotchbond universal (15.8±6.08 mpa) followed by clearfil se bond (15.24±4.6 mpa), etch and rinse scotchbond universal (11.68±4.07mpa) and single bond (11.24±3.74 mpa). a significant difference was only found between single bond and etch and rinse scotchbond universal groups (p=0.04). conclusion: based on the results of this study, application of scotchbond universal in self-etch mode provides a reliable bond to dentin.