Methods: 65 single-rooted teeth were prepared endodontically with the same chemomechanical technique and were randomly divided into three groups based on their final irrigation regimen: 17% EDTA+5.25% NaOCl group (n=30), MTAD group (n=30) and control group (n=5). Obturation of the canals was performed with gutta-percha and AH26 sealer. All teeth were sectioned in order that two specimens of 1mm thickness were obtained from the coronal and the middle one third of each root resulting in 60 specimens for each experimental group and 10 specimens for control group.
Results: In MTAD group, mean micropush-out bond strength of AH26 sealer to dentin walls was obtained 2.23 MPa compared to 2.0 MPa for EDTA+NaOCl group. The mean bond strength of AH26 sealer to dentin walls was significantly greater using MTAD and EDTA+NaOCl compared to saline (control group) final irrigation and the highest value was for MTAD group.
Conclusions: MTAD final rinse significantly increased micropush-out bond strength of AH26 sealer to canal dentin walls compared with EDTA+NaOCl.