上顎骨延長法と下顎正中分割を併用した下顎枝垂直骨切り術により治療を行った重度の骨格性ＩＩＩ級の１例

Abstract

In this report, we describe the case of a 22-year-old male with severe skeletal Class III who was treated with distraction osteogenesis of the maxilla and intraoral vertical ramus osteotomy (IVRO). The severe skeletal Class III was accompanied by hypoplasia of the maxilla and overgrowth of the mandible (overjet, -20.0 mm; overbite, 1.0 mm). A high Le Fort I osteotomy was carried out, and the maxilla was distracted using the rigid external distraction II (RED II) system. After the active distraction and consolidation period, rigid fixation of the maxilla and IVRO were carried out; splitting of the mandible midline was added to the procedure to achieve a narrow mandibular arch width. After 6 months of postoperative orthodontic treatment, the occlusion and masticatory function of the patient had improved, and he was satisfied with the outcome of the treatment.