Effect of sonic application of adhesive on the bond strength of fiber posts cemented to dentin exposed to sodium

Abstract

Objective: The aim of this study was to evaluate the effect of sonic application of the adhesive on the bond strength of fiber posts cemented to dentine previously exposed to sodium hypochlorite (NaOCl). Material and Methods: Thirty single-rooted bovine teeth were used. The teeth were sectioned producing specimens with 7 mm, referring to the cervical and part of the middle third of the root. Root canals were prepared and the samples divided into 3 groups (n = 10). Group 1 the roots were irrigated with distilled water and dried with paper points. In groups 2 and 3, the roots were immersed in NaOCl and then irrigated and dried as described in group 1. For post cementation, in groups 1 and 2 the adhesive was applied manually and in the group 3 with the sonic device Smart Sonic. After cementation,the specimens were segmented into slices and submitted to the push-out test for bond strength analysis. Data were statistically analyzed by Kruskal-Wallis and Mann-Whitney tests (p <0.05). Results: The bond strength results expressed as median (MPa) were: Group 1 (4.12 MPa) = Group 3 (3.41 MPa)> Group 2 (2.71 MPa). Conclusion: In conclusion, the sonic application of adhesive affected the bond strength levels of Ambar/Allcem system to dentin exposed to NaOCl, reaching values significantly similar to the group without NaOCl.