下顎枝斜矢状切咬合改善術とその術後評価第2報 : 下顎前突症患者についての側方頭部X線規格写真による経時的観察

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Thirty-four cases of mandibular prognathism treated with intraoral oblique sagittal splitting osteotomy were evaluated retrospectively by cephalometric analysis of skeletal changes of the mandible during at least 6 months after surgery. The subjects were 17 cases of prognathism and 17 cases of prognathism with anterior openbite.<BR>In those cases of prognathism alone, the distal segment (represented by the point labelled Gn) and the proximal segment (represented by the point Go) were surgically reduced posteriorly parallel to the SN line. In those cases with openbite, the distal segment was surgically mored postero-superiorly and the proximal segment postero-inferiorly.<BR>During intermaxillary fixation, the distal segment remained stable, but the proximal segment returned to the almost preoperative position in both groups of subjects. Until 6 months after releasing the fixation, the distal segment moved antero-superiorly and the proximal segmentinferiorly in the group with prognathism alone. In the other group, both segment remained stable.<BR>After 6 months, both segments remained stable in both groups.<BR>However, the total degree of mandibular regression was so slight that none of cases relapsed to edge-to-edge or Class III malocclusion during the follow-up period.
社団法人日本口腔外科学会の論文