Materials and Methods: Sixty five 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 1 mm 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. For push‑out test, universal‑testing machine was used to exert a constant compressive apico‑coronal load at a speed of 0.5 mm/min. Minimum amount of compressive load caused dislodgement was measured and converted into megapascal (MPa) scale. One‑way analysis of variance and the post hoc Tukey test were used for statistical analysis of the data (α = 0.05). 

  Results: In MTAD group, mean micro‑push‑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 compared with combination of EDTA and NaOCl or saline. 

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Source: Dental Research Journal

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