EFFECT OF CHITOSAN GEL ON SMEAR LAYER,Ca/P RATIO AND PUSH-OUT BOND STRENGTH OF RESIN SEALERS AT DIFFERENT TIME INTERVALS.

Abstract

OBJECTIVE: Comparative evaluation of smear layer removal, calcium phosphate ratio and bond strength of AH Plus sealer to radicular dentin after the use of 0.2% chitosan and 17% EDTAas lubricant and nal rinse at different time intervals(1min and 2min). METHODOLOGY: 75 premolars were prepared using Pro-Taper rotary le. 30 samples were used for testing smear layer removal and Ca/Pratio and 45 samples for testing bond strength. 1ml of 3%NaOCl was used for irrigation of all the samples throughout the preparation. The teeth were randomly divided into 3 groups according to the type of lubricant-17% EDTAgel or 0.2% chitosan gel and the nal irrigant -17%EDTA solutions, 0.2%chitosan solution for 1min and 2min. 30 samples were sectioned longitudinally. One half of the section was used for smear layer analysis using SEM and the other half of the section was used for Ca/Pratio analysis using EDX. 45 samples were obturated with F3 gutta-percha cones using AH plus sealer and sectioned. The samples were subjected to push-out testing using UTM and failure was evaluated using SEM. RESULTS: Smear layer removal and push-out bond strength was found to be highest in EDTA group followed by Chitosan(2min) and Chitosan(1min)groups. EDX analysis showed that the Ca/Pratio of EDTAgroup is signicantly lower than chitosan group. CONCLUSION:Within the limitations of the study it can be inferred that 0.2%chitosan gel lubricant and nal rinse can be used as an alternative to EDTAespecially in teeth with thin dentinal walls, open apices, and root resorption.