Abstract
The aim of the present in-vitro study was to evaluate the efficacy of three endodontic irrigating solutions and also the working time required for effective removal of smear layer formed after biomechanical preparation of root-canals. 17% EDTA (ethylene di-amine tetra acetic acid), 5.25% NaOCl (Sodium hypochlorite) and their combination (17% EDTA and 5.25% NaOCl) were used for a working time of 5,10,15,20,25 and 30 minutes and their efficacy in smear layer removal was evaluated.The result of the study showed that when 17% EDTA was used alone, smear layer was totally removed after 30 min. working time. When 5.25% NaOCl was used alone, it had negligible effect on the removal of smear layer even after 30 min.Their combined use-EDTA followed by NaOCl - kept for a total of 20 min. removed the smear layer completely.
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