An in vitro comparison of push-out bond strength of biodentine and mineral trioxide aggregate in the presence of sodium hypochlorite and chlorhexidine gluconate

Abstract

Aim: The aim of this in vitro study was to compare the push-out bond strength of Biodentine (Septodont, Saint Maur des Fosses, France) and mineral trioxide aggregate (MTA) (Angelus, Londrina, PR, Brazil) when treated with 3% sodium hypochlorite (NaOCl) and 2% chlorhexidine gluconate (CHX). Materials and Methods: Forty-six single canal premolars were selected for this study, and the canal spaces were prepared with #5 Gates glidden drill (1.3 mm diameter). The dentin of these teeth was horizontally sectioned into 1-mm-thick slices at the mid-root level. The samples were divided into two groups (n = 20). Biodentine and MTA were placed into the canal space of dentin slices. The samples were wrapped in wet gauze for 10 min and divided into two subgroups (n = 10) to be immersed into 3% NaOCl and 2% CHX for 30 min. No irrigation was performed in the controls (n = 3). After incubation for 48 h, the dislodgement resistance of the samples was measured using a universal testing machine. The samples were examined under a stereomicroscope to determine the nature of the bond failures. Results: Biodentine showed significantly higher push-out bond strength than MTA (P < 0.05) in the presence of both NaOCl and CHX. Within the MTA group, CHX further reduced the push-out bond strength when compared with NaOCl. Conclusion: Push-out bond strength is the force needed for the displacement of the dental material tested. The various irrigants used during the root canal therapy may increase or decrease the push-out bond strength of a material.