Changes in condylar position after BSSRO with and without Le Fort I osteotomy via surgery-first approach in mandibular prognathism with facial asymmetry

Publication date: Available online 6 February 2017
Source:Oral Surgery, Oral Medicine, Oral Pathology and Oral Radiology
Author(s): Jiyin Li, Sun-Youl Ryu, Hong-Ju Park, Min-Suk Kook, Seunggon Jung, Jeong Joon Han, Hee-Kyun Oh
ObjectivesThis study aimed to evaluate changes in condylar position after bilateral sagittal split ramus osteotomy (BSSRO) with and without Le Fort I osteotomy via surgery-first approach in patients with facial asymmetry.Study DesignEighteen patients (36 condyles) who received surgical-orthodontic treatment using a SFA were included and divided into two groups depending on the extent of surgery: BSSRO-only group (n=12) and BSSRO with Le Fort I osteotomy group (n=6). Using computed tomography images taken preoperatively, immediately postoperatively, and 6 months postoperatively, surgical and postoperative changes of the condylar position were analyzed three-dimensionally.ResultsBoth groups showed mainly lateral and inferior displacement with inward rotation immediately after surgery, and medial and superior returning movement with outward rotation 6 months after surgery. There was no statistical difference in time-course changes of the condylar position between two groups. In comparing the deviated and nondeviated sides, deviated side showed significantly greater amount of bodily shift and rotational movement after surgery than nondeviated side in both groups.ConclusionThese results suggest that BSSRO in SFA, either with or without Le Fort I osteotomy, may cause condylar displacement after surgery and displaced condyles return to their original position in both deviated- and nondeviated sides.



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