Moen Ketil, Wisth Per Johan, Skaale Siren, Bøe Olav Egil, Tornes Knut
Section of Oral and Maxillofacial Surgery, Department of Clinical Dentistry, Faculty of Medicine and Odontology, University of Bergen, Bergen, Norway.
J Oral Maxillofac Surg. 2011 Nov;69(11):e461-8. doi: 10.1016/j.joms.2011.02.086. Epub 2011 Jul 7.
To evaluate the short- and long-term stability of mandibular advancement surgery with sagittal split osteotomy (SSO), and to investigate when relapse occurs and identify variables contributing to relapse.
Thirty-six patients with Class II anomalies were included; the mean age at surgery was 33.0 years. All underwent SSO surgery and clinical and radiologic follow-up at 8 weeks, 1 year, and 13 years. Model analysis, cephalometric analysis, and clinical examinations were performed at each control.
Mean overjet relapse from 8 weeks to 13 years was 2.3 mm (range, 0 to 7.0 mm). Between 8 weeks and 1 year, mean overjet relapse was 0.6 mm (range, -1.0 to 4.0 mm), and it was 1.7 mm (range, -1.0 to 6.0 mm) between 1 year and 13 years. Overjet relapse greater than 4 mm was found in 13.9% of the patients. Mean overjet 1 year after surgery was 2.6 mm and was significantly increased compared with 8 weeks (P = .006). Mean overjet 13 years after surgery was 4.3 mm and was significantly increased compared with 1 year (P < .001). Inferior incisor line to nasion-B-point was 29.0° at 8 weeks after surgery and 25.4° at 13 years (P = .001). Insignificant changes in the other cephalometric variables were found at follow-up.
SSO advancement surgery is a relatively stable technique over time. Mean overjet relapse was found to be 2.3 mm after 13 years, following a continuous pattern over time. The cephalometric variables showed insignificant changes during follow-up, indicating that relapses are mainly of dental and not skeletal origin.
评估下颌矢状劈开截骨术（SSO）进行下颌前徙手术的短期和长期稳定性，研究复发发生的时间并确定导致复发的变量。
纳入36例II类错颌畸形患者；手术时的平均年龄为33.0岁。所有患者均接受了SSO手术，并在术后8周、1年和13年进行了临床及影像学随访。每次复查时均进行模型分析、头影测量分析和临床检查。
从8周到13年，平均覆盖复发量为2.3mm（范围为0至7.0mm）。在8周和1年之间，平均覆盖复发量为0.6mm（范围为-1.0至4.0mm），在1年和13年之间为1.7mm（范围为-1.0至6.0mm）。13.9%的患者覆盖复发量大于4mm。术后1年的平均覆盖量为2.6mm，与8周时相比显著增加（P = 0.006）。术后13年的平均覆盖量为4.3mm，与1年时相比显著增加（P < 0.001）。术后8周时，下切牙连线至鼻根点-B点为29.0°，13年时为25.4°（P = 0.001）。随访时其他头影测量变量无显著变化。
随着时间推移，SSO前徙手术是一种相对稳定的技术。13年后平均覆盖复发量为2.3mm，呈随时间连续变化的模式。随访期间头影测量变量无显著变化，表明复发主要源于牙齿而非骨骼。
