In vivo accuracy of conventional and digital radiographic methods in confirming root canal working length determination by Root ZX

objectives: to compare, in vivo, the accuracy of conventional and digital radiographic methods in determining root canal working length. material and methods: twenty-five maxillary incisor or canine teeth from 22 patients were used in this study. considering the preoperative radiographs as the baseline, a 25 k file was inserted into the root canal to the point where the root zx electronic apex locator indicated the apex measurement in the screen. from this measurement, 1 mm was subtracted for positioning the file. the radiographic measurements were made using a digital sensor (digora 1.51) or conventional type-e films, size 2, following the paralleling technique, to determine the distance of the file tip and the radiographic apex. results: the student "t" test indicated mean distances of 1.11 mm to conventional and 1.20 mm for the digital method and indicated a significant statistical difference (p<0.05). conclusions: the conventional radiographic method was found to be superior to the digital one in determining the working length of the root canal.