Methodological proposal for evaluation of adhesion of root canal sealers to gutta‐percha

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Abstract
Aim: To compare the bond strength of an epoxy resin‐based sealer and two calcium silicate‐based sealers (CSS) to gutta‐percha discs using a new method.Methodology: Round discs of gutta‐percha (n = 60), measuring 10 mm in diameter and 2 mm in thickness, were placed on a glass plate and a drop of each sealer (AH Plus, EndoSequence BC Sealer and EndoSeal MTA) was placed on their surface. Another identical disc was placed onto the first one and a standardized weight (0.0981 N) applied over them using a specially developed apparatus. Ten samples prepared for each sealer were submitted to a microshear bond strength test accomplished by a specially designed set‐up coupled to a universal testing machine. The Kruskal–Wallis test followed by a post hoc procedure was used to compare groups considering the preliminary analysis of the raw data had indicated the nonadherence to a Gaussian distribution (Shapiro–Wilk, p < .05). Alpha error was set at 5%.Results: Overall, no premature failure occurred. All sealers had some degree of adhesiveness to gutta‐percha discs but with a significant difference amongst them (Kruskal–Wallis, p = .019). The epoxy resin‐based sealer (AH Plus) had significantly higher median shear bond strength values (1.43 MPa; 1.40–1.83) compared to EndoSeal MTA (0.53 MPa; 0.46–0.73) (p = .021) and EndoSequence BC Sealer (0.45 MPa; 0.34–0.46) (p = .023), whilst the lowest median value was observed with EndoSequence BC Sealer (0.45 MPa; 0.34–0.46) (p < .05).Conclusions: CSS sealers had weaker bonding to gutta‐percha when compared to the epoxy resin‐based AH Plus sealer. The proposed methodology is an innovative and reproducible method for testing the bond strength of root canal sealers to gutta‐percha.

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