Efficacy of Various Irrigants Used with Self- Adjusting File System on Smear Layer: An In Vitro Study

Aim: To assess the efficacy of various irrigants used with Self-Adjusting File (SAF) system on smear layer. Materials and Methods: Forty extracted mandibular teeth were taken and decoronated. All samples were instrumented manually up to number 20 K file. SAF file was further used to prepare the canals. All the samples were randomly divided into four Groups: Group I: Neem Extract Group II: Amla Juice; Group III: 5.25% NaOCl+ 20% Citric Acid; Group IV: 5.25% NaOCl solution was used for 4minutes. All roots were sectioned longitudinally in the buccolingual plane and viewed under electron microsope. Statistical Analysis Used: The Kruskal-Wallis test was used for statistical evaluation and Mann-Whitney ???? test was used for multiple comparisons Results: Comparison between same thirds of group showed statistically significant difference in coronal and middle parts. Group 3 showed the best results for smear layer removal. Group 4 showed least efficacy of smear layer removal. Conclusion: Group 3 showed the best removal efficacy followed by group 1 and 2 with least being for group 4.

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

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.