The impact of root dentine conditioning on sealing ability and push-out bond strength of an epoxy resin root canal sealer

Neelakantan P, Subbarao C, Subbarao CV, De‐Deus G, Zehnder M. The impact of root dentine conditioning on sealing ability and push‐out bond strength of an epoxy resin root canal sealer. International Endodontic Journal, 44, 491–498, 2011. Aim To investigate the impact of dentine conditioning on sealing ability and dentine bond strength of an epoxy resin sealer. Methodology Root canals in 90 single‐rooted teeth were instrumented using a rotary Ni‐Ti system. Fifty canals were irrigated with water during instrumentation, 40 with 3% NaOCl. A final flush was performed in the water‐irrigated specimens with water (negative control), 3% NaOCl, 17% EDTA, 7% maleic acid (MA) or 2% chlorhexidine. The hypochlorite irrigated specimens received a final flush with a decalcifying agent (EDTA or MA) and then 3% NaOCl or 3% NaOCl and then the decalcifying agent (n = 10, each). Canals were all filled with AH Plus. Fluid transport was measured on day 3 and 30. Roots were then sectioned, and push‐out tests were performed in coronal, middle and apical root thirds. Results were analysed using analysis of variance (anova) with Bonferroni’s adjustment. Spearman’s rank correlation was computed between fluid transport and push‐out bond strength. Results Leakage decreased over time (P