Positional Changes of External Segments of the Mandible after Sagittal Splitting Ramus Osteotomy in 6 Cases.

概要

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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.<BR>The results were as follows:<BR>1. The condylar angulation immediately after sagittal splitting ramus osteotomy increased.<BR>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.<BR>3. It was suggested that the condylar angulation on the side of deviation in the case of facial asymmetry was increasing.
特定非営利活動法人日本顎変形症学会の論文