Effect of endodontic irrigants on microtensile bond strength of adhesives

Objectives: The aim of this study was to evaluate the microtensile bond strength of one self-etch (Clearfil SE Bond, Kuraray) and one total etch (XP Bond, Dentsply) adhesive systems to dentin following endodontic irrigants application.

Methods: Occlusal enamel of 24 noncarious human third molars were removed using 180 grit SiC paper and smear layer on the mid coronal dentin was standardized using 600 SiC. The teeth were then divided into 3 groups according to the following irrigating protocols: 5 ml distilled water (control);  1.3% NaOCl for 20 minutes followed by 5 min with BioPure MTAD®. 5.25% NaOCl for 1 min followed by 17% EDTA solution for 1 min. Each group was further divided into 2 subgroups according to the adhesive system used (Clearfil SE Bond; XP Bond). Hybrid composite was used for composite built ups (Filtek Z 250; 3M ESPE). After storage in distilled water at 37^oC for 24 h, microtensile bond strength (MPa) was evaluated using Bencor Multi Testing device attached to a universal testing machine (Instron). Data were analyzed using One Way ANOVA and post hoc Tukey's test.

Results: Different superscript letters indicate statistically significant differences (p<0.05) in the same row and different capital superscript letters  indicate significant differences in the same column.

Conclusions: It may be advisable to prefer a total-etch adhesive system following endodontic irrigants application since with self-etch adhesive system decrease in bond strength was determined.