In the practice of endodontics, many different irrigation methods are used for this purpose. In this study, the effectiveness of different irrigation techniques on CH removal was evaluated. In the literature, calculation of the residual amount of CH remaining in the root canal were made by calculating the area of the remnant on dentin wall, by scoring, SEM analysis, volume analysis with spiral CT, and by using a micro-CT5,25,30,32. We preferred the scoring method described in the study by van der Sluis, et al.30 (2007) because it is a simple and easily accessible technique and used in many previous studies1,8.