RESUMO
Bond strength of the adhesive sealers to both human dentin and gutta-percha is critical property for success of the root canal sealing. This in vitro study aimed to measure the shear bond strength [SBS] of three different adhesive sealers glassionomer based sealers [Ketac-Endo] and [Diaket] and epoxy resin-based sealer [AH 26] to both the gutta-percha and human dentin. Part I: The dentin substrate was obtained from single rooted human teeth. The dentin specimens were treated either with EDTA 15% or phosphoric acid 37% to achieve the removal of smear layer. Three adhesive sealers [glass-ionomer based sealers [Ketac-Endo] and [Diaket] and epoxy resin-based sealer [AH 26] were placed on the dentin surfaces both with and without the use of the bonding agent. Bond strength was tested using a single plane shear test assembly. Part II: Discs of gutta-percha with a diameter of 8 mm and thickness of 4mm were made by softening of the gutta-percha cones and fixed with plaster in rings. Four millimeter long sections of polyethylene tube filled with freshly mixed sealer were placed on the gutta-percha and tested using a single plane shear test assembly. By using t-test, the results revealed that there was highly significant difference between epoxy resin-based sealer and the two other glass-ionomer based sealers at p< 0.01 with in favor of the AH26 sealer. The bonding system and the dentin pretreatment increased the adhesive potential of the AH26 sealer which had higher shear bond strength than the two glassionomer based sealers