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Background: This study compared the bond strength of two sealers after employing various chelating agents as final rinses
Materials and Methods: Ninety extracted mandibular premolars were sectioned at the level of the cementoenamel junction. Following the working length determination and biomechanical preparation, the specimens were randomly divided into three groups based on the chelating agent used as final rinses: Group I - 17% ethylene diaminetetraacetic acid, Group II - 1% peracetic acid and Group III - 0.2% chitosan. In all three groups, 5 ml of the chelating solution was used for 1 minute. Then, they were further sub-grouped on the basis of the endodontic sealer used for obturation of the root canal (AH Plus/Bio-C bioceramic sealer). Bond strength was measured using a Universal Testing Machine and fracture mode was determined using a stereomicroscope. Data were analyzed using two‑way ANOVA test, Tukeys post-hoc test and Chi-square test (P< 0.05).
Results: The highest push-out bond strength was of Bio-C bioceramic sealer after treatment with 0.2% chitosan (2.92±0.46) while the least was of AH Plus sealer after 17% EDTA treatment (2.12±0.21). Mixed failure (both adhesive and cohesive) was commonly found in AH Plus sealer while Bio-C bioceramic sealer mostly had a cohesive type of failure.
Conclusion: Within the limitations of this study, conclusion drawn is that chelating agents studied in the present study influence the bond strength of endodontic sealers when used as final rinses.
Key Words: Chelating agents, Bioceramic sealer, AH Plus sealer, Bond-strength testing.
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