Canal transportation and centering ability of protaper and self-adjusting file system in long oval canals: An cone-beam computed tomography analysis.

Context And Aims: The purpose of this study was to compare and evaluate the shaping ability of ProTaper (PT) and Self-Adjusting File (SAF) system using cone-beam computed tomography (CBCT) to assess their performance in oval-shaped root canals.

Materials And Methods: Sixty-two mandibular premolars with single oval canals were divided into two experimental groups ( = 31) according to the systems used: Group I - PT and Group II - SAF. Canals were evaluated before and after instrumentation using CBCT to assess centering ratio and canal transportation at three levels.