COMPARATIVE EVALUATION OF EFFECT OF 0.2% CHITOSAN, COMBINATION OF 5.25% SODIUM HYPOCHLORITE (NAOCL) AND 17% ETHYLENE DIAMINE TETRAACETIC ACID (EDTA) AS FINAL IRRIGANTS ON PUSH-OUT BOND STRENGTH OF MTA FILLAPEX-AN IN VITRO STUDY

Context:The push-out bond strength of a sealer depends on removal of smear layer and its adhesion to dentin. This can be achieved by using potential final irrigants. Aim:To evaluate and compare effect of 0.2% chitosan and 5.25% Sodium Hypochlorite (NaOCL) followed by 17% ethylene diamine tetraacetic acid (EDTA) on the push-out bond strength of MTA Fillapex. Methods and Material:45 single rooted mandibular premolar teeth divided into three groups where final irrigation was done using Group 1 - 0.2% Chitosan for 1 minute Group 2 - 5.25% NaOCL followed by 17%EDTA for 1 minute Control group – 0.9% saline. Obturation was done using MTA Fillapex sealer and cold lateral compaction technique. Two horizontal sections of each sample were tested using universal testing machine for push-out bond strength. Statistical analysis used: Data was assessed using one way ANOVA with Tukeys post-hoc analysis. Results:The results showed that both in coronal and middle third, irrigation with 0.2% chitosan showed higher push-out bond strength. In intra-group comparison, coronal third showed highest pushout bond strength compared to middle third. Conclusion:0.2% chitosan can be used as an alternative to NaOCL and EDTA as it effectively removes the smear layer without causing erosionof intra-radicular dentin.