The influence of different root canal medicaments on the tensile bond strength of composite resin to coronal dentin.

Abstract

Background: Intra canal medicaments are routinely used during endodontic procedure and may influence the bond strength of resin materials to the dentin. The purpose of this in vitro study was to assess the adherence of composite resin to dentin conditioned with different intracanal medicaments by using the 7th generation bonding agent. Materials and Methods: Superficial dentin of 60 human premolars was used as substrate. The following irrigants solutions were applied to dentin surface for 60 seconds- Distilled water, 2% NaOCl, 2% CHX and 17% EDTA with 2% NaOCl. The FC and CMCP were maintained in contact with the dentin for 3 days. Gluma-BOND was applied to the conditioned dentin and the test specimens were built with composite resin (Cavex). After storage in distilled water at 37oC for 24 hours the specimens were thermocycled for 500 cycle, then tested to failure for tensile bond strength (MPa) in an Instron machine and examined the mode of failure under the stereomicroscope Results: The TBS did not differ significantly among those conditioned with DDW, FC and CMCP. The mean scores were significantly higher after conditioning with CHX group and 17% EDTA with 2% NaOCl group, while the mean scores were significantly lower after conditioning with 2% NaOCl group. Conclusion: The intracanal medicaments differently influence the adhesion of composite resin to coronal dentin bonded with Gluma-BOND and on the mode of failure.