Purpose: The purpose of this study was to evaluate post-surgical skeletal stability in patients with facial asymmetry and canted occlusal plane.
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
nd day, and then 1, 3, 6, 12 and over 24 months after the surgery.
Results: On the 2
nd 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
nd 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.
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.
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