Various methods such as dye penetration, bacterial penetration, radio-labeled tracer penetration, dissolution of hard tissue, clearing of teeth, spectrometry of radioisotopes, electrochemical methods and gas chromatography have been used for evaluating the apical sealing properties of root canal sealers.12,13 According to Goldman et al14 (1989), the results of tracer penetration are hindered by the presence of entrapped air and are probably not very reliable.14 However, because of its sensitivity and amenity, the most common measurement used is dye penetration method.12 The longitudinal sectioning method facilitates examination of the exposed filling material and any dye penetration into the material at the interface of the dentinal wall on one side.15 The depth of dye penetration represents the gap between the root filling and canal walls.12