Effect of different adhesion strategies on push-out bond strength of fiber reinforced composite posts

Abstract

The aim of this study was to compare the bond strength of translucent fiber posts to root dentin, cemented with 4 adhesion strategies. Forty eight (48) sound human central incisors were decoronated and divided into 4 groups: Etch-and-rinse group, two-step self-etch group, one-step self-etch group, and self-adhesive resin cement group. The adhesion between the post and root canal walls was assessed using push-out test. Data was analyzed using one and two way ANOVA and a post hoc Tukey test (P<0.05). There were significant differences in mean bond strength values between the etch-and-rinse group and the other groups (P<0.001). Bond strength in the apical region was significantly different from those of the middle (P = 0.018) and cervical (P = 0.014) regions in etch and rinse group. The results were confirmed by scanning electron microscopy (SEM). Etch and rinse adhesive systems are more effective in bonding of fiber posts to post space dentin.

Key words: Adhesive system, bond strength, fiber post, root canal dentin.