To evaluate the influence of irrigation protocols and drying procedures on the bond strength of two methacrylate-based sealers to dentin and the associated failure pattern using scanning electron microscopy (SEM). Fifty single-rooted human teeth were prepared with an irrigation protocol using either...

To evaluate the influence of irrigation protocols and drying procedures on the bond strength of two methacrylate-based sealers to dentin and the associated failure pattern using scanning electron microscopy (SEM). Fifty single-rooted human teeth were prepared with an irrigation protocol using either 5.25% sodium hypochlorite (NaOCl) or 2% chlorhexidine (CHX) and 17% EDTA (ethylenediaminetetraacetic acid) for smear layer removal. The following subgroups were also created based on drying of the root canal walls: paper points, the canals were blot dried with paper points with the last one appearing dry; or, ethanol, excess distilled water was removed with paper points followed by dehydration with 95% ethanol for 1 min and blotting with paper points. Each group was divided into two subgroups on the basis of the root canal sealer: EndoREZ and RealSeal SE. Bond strength was measured by the push-out test. The data were analyzed by ANOVA/Tukey HSD (alpha=0.05). Failure patterns were classified as adhesive, cohesive, and mixed in the SEM analysis. The failure mode was evaluated by the chi-squared test (alpha=0.05). The roots irrigated with NaOCl showed significantly lower bond strength than the roots irrigated with CHX (p<.05). RealSeal SE showed higher bond strength when compared with EndoREZ (p<.05). The highest values of bond strength were in the CHX and ethanol groups with RealSeal SE (p<.05). An increase in adhesive failure was observed in the NaOCl and EDTA group. The bond strength of both methacrylate-based sealers is influenced by the irrigant protocol

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