INFLUENCE OF DIFFERENT FINAL ROOT CANAL IRRIGATION REGIMENS ON THE PUSH-OUT BOND STRENGTH OF AH PLUS

Aim: to evaluate influence of different final irrigation regimens on bond-strength of epoxy resin based sealer (ah plus). material and method: forty-eight mandibular incisors were irrigated with 2.5% sodium hypochlorite during and after completion of root canal preparation. roots were divided into 4 groups (n = 12) according to the final irrigation regimens: group 1: 5 ml 17% ethylenediaminetetraacetic acid (edta); group 2: 5 ml 17% edta followed by 5 ml 2% chlorhexidine gluconate (chx); group 3: 5 ml qmix; and group 4: 5 ml distilled water as control. all specimens were filled with gutta-percha (gp) and ah plus. one-millimeter thick four horizontal sections from each root were sliced for bond-strength measurement. data were statistically analyzed by one-way anova and bonferroni tests (p<0.05). results: specimens that were irrigated with edta/chx displayed significantly the highest mean bond strength value (p<0.001). specimens mainly showed a cohesive failure pattern, regardless of final irrigation regime. conclusion: using 2% chx in the final irrigation after 17% edta was improved ah plus’s bond-strength. final irrigation with edta followed by chx was more effective at improving bond strength of ah plus compared to qmix that consists edta and chx.