Evaluation of different clearing techniques: An auxiliary method for studying root canal anatomy

Various techniques for clearing the root canal system have been used in different aspects of dentistry. Poor quality of the final cleared tooth may affect accurate evaluation of the anatomy or other characteristics of the canals. The purpose of this study was to compare a number of currently used clearing methods in order to identify the most effective procedure. Fifty human extracted premolars were included in this experimental study. A routine clearing protocol was employed for all teeth. The specimens were divided into 5 groups of 10, applying different combinations of decalcifying (HCL, HNO3) and clearing agents (eugenol, methyl salicylate). The samples were examined by two endodontists. Data were subjected to statistical analysis using Chi-square and Kruskal Wallis tests. A significant difference was observed between the study groups. The most effective decalcifying material and clearing agent was %10 HCl and methyl salicylate, respectively. According to the results of the present investigation, application of %10 HCl along with methyl salicylate is suggested for the evaluation of the root canal system.