Impact of Final Irrigation Protocol on the Push-Out Bond Strength of Two Types of Endodontic Sealers.

The aim of this study was to assess the impact of the final irrigation protocol on the push-out bond strength of calcium silicate-based sealers when compared to an epoxy resin-based sealer. Eighty-four single-rooted mandibular human premolars were shaped using the R25 instrument (Reciproc, VDW, Munich, Germany) and then divided into three subgroups of 28 roots each depending on the final irrigation protocol: EDTA (ethylene diamine tetra acetic acid) and NaOCl activation, Dual Rinse HEDP (1-hydroxyethane 1,1-diphosphonate) activation or sodium hypochlorite (NaOCl) activation. Then, each subgroup was divided into two groups (14 each) according to the sealer used (AH Plus Jet or Total Fill BC Sealer) for single-cone obturation. Dislodgement resistance using a universal testing machine, samples' push-out bond strength and failure mode under magnification were determined. EDTA/Total Fill BC Sealer showed significantly greater values of push-out bond strength compared with HEDP/Total Fill BC Sealer and NaOCl/AH Plus Jet, with no statistical difference with EDTA/AH Plus Jet, HEDP/AH Plus Jet and NaOCl/Total Fill BC Sealer, whereas HEDP/Total Fill BC Sealer showed significantly lower values of push-out bond strength. The apical third demonstrated higher means of push-out bond strength compared with middle and apical thirds. The most common failure mode was cohesive but showed no statistical difference compared to other types. : Irrigation solution and final irrigation protocol affect the adhesion of calcium silicate-based sealers.