EVALUATION THE EFFICACY OF SELF-ADJUSTING FILE IN CSHAPED CANALS DURING ROOT CANAL PREPARATION

Background: the purpose of this study was to assess the efficacy of instrumentation of c-shaped canals with self-adjusting file (saf). methods: ten mandibular molars with c-shaped canals were selected using a cone beam computed tomography and crowns were decoronated. after root canal enlargements using a hand file to iso 20, light green was injected into the root canals and roots were kept in a vacuum container. following dye colouring, c-shaped root canals were prepared using the saf for 4 minutes. roots were split into two halves using the clear-cut technique and images were recorded using a steoromicroscobe. images were than transferred into adobe photoshop and image j to calculate the touched or untouched areas of saf on the root canal dentine. arithmetical means were calculated and recorded. results: the 66% of the total root canal area was prepared using the saf however there were untouched root canal dentin in a total of 34% of the c-shaped root canal system. conclusions: saf system was unable to remove dentin especially from the coronal thirds of the cshaped root canal walls.