Evaluation Of Effect Of Various Endodontic Irrigants And Intra Canal Medicaments On Push-Out Bond Strength To Root Canal Dentin - An In-vitro study

Endodontic therapy involves the use of various instrumentation and irrigation techniques along with intra canal medicaments to ensure thorough cleaning and shaping of the canal. With the development of new dentin bonding systems and resin cements, resin based adhesive materials are widely used in the restoration of endodontically treated teeth. However, the irrigants and medicaments used during endodontic therapy may influence the bond strength of resin materials to root canal dentin. The aim of the present study was to evaluate such bond strength effects caused by use of common irrigants and intra canal medicaments. MATERIALS AND METHOD: The irrigants used were 0.2% Chlorhexidine gluconate, 3% Sodium hypochlorite, 3% Hydrogen peroxide, Combination of 3% Sodium hypochlorite & 3% Hydrogen Peroxide, Isotonic saline (control). Similarly, the medicaments used were Calcium hydroxide and Formocresol. The resin cement used was C&B Superbond and the bond strength test employed was Push-out test. Seven groups with seven samples each were treated with the subject materials and then restored with C&B Superbond cement. The samples were then subjected to Push-out tests on a Instron universal testing machine. Push-out strength was calculated, results were tabulated and subjected to statistical analysis. RESULTS of the study indicated that calcium hydroxide and formocresol did not influence bond strength significantly, whereas sodium hypochlorite, hydrogen peroxide and their combination had a detrimental effect. Chlorhexidine had a positive effect and was associated with increased bond strength values. CONCLUSION: According to the results shown in this study, in teeth which are planned to be restored post endodontically with adhesive post and core systems, chlorhexidine may be an appropriate irrigant during root canal treatment resulting in increased bond strength to root canal dentin.