Postoperative Positional and Dimensional Changes of Mandibular Canal after Bilateral Sagittal Split Set-Back Osteotomy

Özet

Objective: This preliminary study was planned to provide information about preoperative mandibular canal (MC) position and thepostoperative positional changes of MC and length in three dimensions, with the purpose of providing some assistance in reducinginferior alveolar neurosensory disturbance (IAND).Methods: MC was examined on CBCT data using SimPlant Pro Standalone 13.0. MC locations were measured in all dimensions, withrespect to mandibular bony borders.Results: The results showed that MC is frequently located in the midthird of the ramus anteroposteriorly and superoinferiorly and inthe midthird of the corpus superoinferiorly. Postoperatively, ramus width was increased, ramus length was decreased significantly,and MC was repositioned laterally and inferiorly. MC length was decreased on both sides, non-correlated with the set-back amounts.Conclusion: Preoperative results may be beneficial for the prediction of MC position for surgeons, and postoperative results will beused for the following studies to correlate postoperative positional changes with IAND.