Comparative evaluation of pushout bond strength of resin-based sealer using different irrigation protocol - an in vitro study

Aim: The primary goal of this research is to assess the pushout bond strength of Resin-based sealer using different irrigation protocols. Materials and Methods: 36 single-rooted premolars were decoronated using a diamond disc to obtain a standardised root length of 13mm. Then, canal patency and working length were established. The root canals were then instrumented using protaper universal nickel-titanium rotary instruments. Sodium hypochlorite was used to passively irrigate the root canals. Based on the final irrigant used, all the samples were divided into three groups. Group1: Sodium hypochlorite followed by Diode laser. Group 2: 7%Maleic acid, Group 3: N-Acetyl Cysteine. After the final irrigation procedure, all the root segments were obturated with Gutta percha points using AH plus sealer and then sectioned into coronal, middle, and apical thin sections after 7 days. Then all the samples were subjected to a Universal testing machine and statistical analysis was done using ANOVA and Post hoc tests. Results: The mean highest pushout bond strength was observed in Group 1 which used Sodium hypochlorite, followed by Diode Laser, followed by Group 2 Maleic acid and then Group 3 N Acetyl Cysteine, the lowest. Conclusion: With the use of Diode laser, there is an increase in the pushout bond strength of AH plus sealer, eliminating all the smear layer and exposing all the dentinal tubules, thereby better adherence of obturation material.