Abstract
The purpose of this study was to evaluate the changes of the external segments after Obwegeser-Dal Pont's sagittal splitting ramus osteotomy. Condylar angulation, ramus angulation, distance between rami and position of point Ar of 6 cases were measured before operation and 1, 3, 6 and 12 months after operation.
The results were as follows:
1. The condylar angulation immediately after sagittal splitting ramus osteotomy increased.
2. The condylar angulation had a tendency to return to the preoperative status and the distance between rami became shorter until 12 months postoperatively. It was considered that the external segments were moved inside by rotation.
3. It was suggested that the condylar angulation on the side of deviation in the case of facial asymmetry was increasing.
