Effect of sodium hypochlorite on the shear bond strength of fifth- and seventh-generation adhesives to coronal dentin

Abstract

The aim of this study was to investigate the effect of sodium hypochlorite (NaOCl) on the shear bond strength of fifth- and seventh-generation adhesive resins to coronal dentin. Thirty human third molars were selected and sectioned into two halves buccolingually. Sixty samples were randomly divided into four groups (n = 15). The crowns were separated from the roots. Subsequent to the removal of pulp tissue, the inner surfaces of tooth crowns were rubbed using 600-grit silicon carbide paper in order to obtain flat dentin surface. In group 1, Single Bond (the fifth generation adhesive resin) was used. In group 2, single bond adhesive resin was used subsequent to NaOCl solution application. In groups 3 and 4, the same procedures as described for groups 1 and 2, were repeated respectively, except for the fact that instead of the fifth generation adhesive resin, the seventh generation adhesive resin (Clearfil S3 Bond) was used. Subsequent to composite resin placement over dentin surfaces, the samples were subjected to shear bond strength test. Data were analyzed using ANOVA and Tukey test. The significance level was set at p<0.05. There were statistically significant differences between the groups (p<0.05). The use of NaOCl reduced the shear bond strength of fifth- and seventh-generation adhesive resins to dentin and there was no difference in the shearing bond strength of both adhesive resins.