Mandibular advancement surgery in high-angle and low-angle Class II patients: Different longterm skeletal responses
Mandibular advancement surgery in high-angle and low-angle Class II patients: Different longterm skeletal responses
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DOI：
10.1067/mod.2001.110983
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发表时间：
2001-04-01
影响因子：
3
通讯作者：
Lyberg, T
中科院分区：
文献类型：
--
作者：
Mobarak, KA;Espeland, L;Lyberg, T
这项头影测量研究的目的是比较高角度和低角度II类患者下颌前移手术后的骨骼稳定性和术后变化的时间进程。研究对象为61例下颌骨后凸患者，采用双侧矢状劈开截骨术和坚固内固定治疗。按术前下颌平面角进行分组，其中下颌平面角最小(20.8°+/-4.9°)的20例为低角组。下颌平面角最大(43.0°+/-4.0°)的20例为高角组。共拍摄了6次头颅侧位片：术前、术后即刻。术后2、6个月，术后1、3年。结果显示，高角组和低角组的手术和术后变化模式不同。高角度患者水平复发的频率和程度都较高。在低角度组，95%的总复发率发生在术后2个月内，而高角组患者表现出更持续的复发模式，其中相当大的比例(38%)发生在随访期的晚期。对术后反应不同的可能原因进行了讨论。
The objective of this cephalometric study was to compare skeletal stability and the time course of postoperative changes in high-angle and low-angle Class II patients after mandibular advancement surgery. The subjects were 61 consecutive mandibular retrognathism patients whose treatment included bilateral sagittal split osteotomy and rigid fixation. The patients were divided according to the preoperative mandibular plane angle; the 20 patients with the lowest mandibular plane angle (20.8 degrees +/- 4.9 degrees) constituted the low-angle group. while the 20 cases with the highest mandibular plane angle (43.0 degrees +/- 4.0 degrees) represented the high-angle group. Lateral cephalograms were taken on 6 occasions: immediately before surgery, immediately after surgery. 2 and 6 months after surgery, and 1 and 3 years after surgery. Results demonstrated that the high-angle and low-angle groups had different patterns of surgical and postoperative changes. High-angle patients were associated with both a higher frequency and a greater magnitude of horizontal relapse. While 95% of the total relapse took place during the first 2 months after surgery in the low-angle group, high-angle patients demonstrated a more continuous relapse pattern, with a significant proportion (38%) occurring late in the follow-up period. Possible reasons for the different postsurgical response are discussed.