Comparison of working length determination using cone-beam computed tomography, electronic apex locator and periapical radiograph in teeth with periapical lesion

Abstract

Context: The accurate determination of working length (WL) has a major impact on the outcome of root canal treatment. Aim: The aim of present clinical study was to compare the accuracy of working length (WL) determination using Cone Beam Computed Tomography (CBCT), Periapical radiograph and Electronic apex locator in teeth with periapical lesion. Settings and Design: Randomised control trial. Materials and Method: This study was conducted on 30 patients with an initial diagnosis of a periapical lesion in teeth. The working length of the involved teeth was determined using three techniques. In all patients working length was first detected using an Electronic apex locator. Secondly, with periapical radiograph using Ingle's method and then from CBCT scans. The three measurements so obtained were tabulated and compared using statistical analysis. Statistical analysis used: Non-parametric paired T-tests were carried out. Results: The mean values for WL determination by electronic apex locator, periapical radiographs and CBCT images were 20.1833, 20.4667 and 20.7533 respectively. Statistical significant differences were found between the three methods. However, CBCT gave more precise readings.