This study investigated the long-term stability of jaw relations and occlusion following surgical orthodontic treatment cases. Subjects consisted of seventeen adult patients. Eleven patients received sagittal splitting ramus osteotomy, SSRO, of the mandible and six patients received two-jaws surgery, Le Fort I osteotomy, of the maxilla and SSRO of the mandible. They were observed over five years after the end of active treatment (mean: 8 years 5 months), and lateral X-ray cephalograms were taken at the beginning (T1), the end of active treatment (T2) and the latest examination (T3).
The results were as follows between T2 and T3. In the SSRO group, there was no significant difference and that was stable. In the SSRO + LF I group, total face height was increased 1.4mm and upper incisors were lingually inclined and decreased by 3.9 degrees.
The result of the surgical orthodontic treatment was stable and the change of retention phase limited in clinical acceptance. There was no significant difference in postoperative stability between the SSRO group and SSRO + LF I group.