Objectives: the aim of this study was to evaluate, in vitro, the action of the chelanting agents EDTA, EGTA and CDTA, on the human dentine, on apical marginal leakage of different root canal sealers. Methods: Apical marginal leakage was evaluated by India ink penetration. Seventy-four maxillary canines obtained from laboratory stock, were instrumented with K-files (Dentsply – Maillefer, Ballaigues, Switzerland) by Crown-down technique, and irrigated with 0.5% sodium hypochlorite solution. Two ml of sodium hypochlorite was used between every instrument change. After root canal instrumentation, teeth received a irrigation with 2 ml of tested solutions for 5 minutes followed by final irrigation with destilated water. One tooth was used as a positive control and one as a negative control. The remaining teeth were divided into 12 groups and prepared to root canal obturation. The root canal sealers used were Sealer26, Sealapex, N-Rickert and Grossman cement. Teeth were obturated by lateral condensation technique. The teeth were immersed in India ink and submitted to decalcification and clarifying for marginal apical microleakage visualization with a microscope. Results: Results were submitted to parametric statistical analysis, showing no statistical differences between chelanting agents groups, however between the root canal sealers, the results showed statistical differences (p<0.05). Conclusions: We conclude that different solutions for smear layer removal don't influence in the results of marginal leakage levels of tested root canal sealers.

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