EVALUATION OF ACCURACY OF TWO DIFFERENT APEX LOCATORS FOR DETERMINING THE WORKING LENGTH DURING ROOT CANAL RETREATMENT WITH TWO DIFFERENT FILE SYSTEMS: AN IN VITRO STUDY

Aim: The aim of this study is to evaluate accuracy of two different apex locators for working length determination during root canal retreatment with two different file systems. Materials and methods: 40 extracted single-rooted human teeth with mature apices were selected for the study. Tooth length was measured with a file, followed by biomechanical preparation and the teeth were obturated using sealer and gutta-percha. Retreatment was performed on the samples prior to determination of working length. Two different rotary files ProTaper retreatment files and R-endo were used for retreatment. After removal of gutta percha working length was determined. The samples were divided into two groups. Working length was measured using two different apex locators; Root ZX and iRoot. Results: Significant difference was found in Root ZX and ProTaper retreatment files. No significant difference was seen in both Root ZX and i-Root with R-Endo files. Conclusion: Root ZX apex locator was more accurate as compared to i-Root apex locator in determining the working length during retreatment.