Skeletal Stability after Bimaxillary Osteotomy in Patients with Facial Asymmetry and Canted Occlusal Plane
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Purpose: The purpose of this study was to evaluate post-surgical skeletal stability in patients with facial asymmetry and canted occlusal plane.<BR>Methods: The subjects were 7 patients who underwent bilateral sagittal splitting mandibular ramus osteotomy and Le Fort I osteotomy. Pre- and post-surgical skeletal changes were measured by frontal cephalogram. Bone fixation with mini-plates and maxillomandibular traction with elastic bands after surgery were performed. Radiographs were taken on the initial, pre-surgical and 2<SUP>nd</SUP> day, and then 1, 3, 6, 12 and over 24 months after the surgery.<BR>Results: On the 2<SUP>nd</SUP> day after the surgery, the canted occlusal plane was horizontal in all of the subjects. At 6 months after the surgery, 4 of 7 cases had stabilized but 3 cases had slightly relapsed. Laterality of the lateral angle of the mandibular ramus had stabilized at 6 months after surgery. The ratio of the right and left vertical distances between the X-axis and neck point on the buccal surface of the maxillary first molar approached 1.0 in all of the subjects. On the 2<SUP>nd</SUP> day after the surgery, but relapsed later. At 6 months after the surgery, the ratio had stabilized. Over 2 years after the surgery, the distance from the Y-axis to the upper and lower central incisor's midline had stabilized.<BR>Conclusion: These results suggested that in patients having facial asymmetry with canted occlusal plane and undergoing bilateral sagittal splitting mandibular ramus osteotomy and Le Fort I osteotomy, there is some possibility of relapse in the first 6 months after surgery.
- 特定非営利活動法人 日本顎変形症学会の論文
特定非営利活動法人 日本顎変形症学会 | 論文
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