Aymach Zaher, Nei Hitoshi, Kawamura Hiroshi, Van Sickels Joseph
Department of Maxillofacial Surgery, Graduate School of Dentistry, Tohoku University, Aoba-ku, Sendai, Japan.
J Oral Maxillofac Surg. 2011 Mar;69(3):853-60. doi: 10.1016/j.joms.2010.05.020. Epub 2010 Nov 11.
To evaluate the surgical-orthodontic stability of treating skeletal open bite patients with mandibular ramus osteotomies using a modified inverted L osteotomy (M-ILO) and counterclockwise rotation of the mandible stabilized with rigid fixation.
In a retrospective review, 12 patients with skeletal open bites (8 females, 4 males) who received mandibular M-ILO in the period 2004-2007 at Tohoku University Hospital were studied. Lateral cephalograms were taken immediately before surgery (T1), immediately after surgery (T2), and at 1 yr after surgery (T3). Cephalometric analysis for point B, pogonion, menton, and mandibular plane angle was obtained at the designated time intervals.
Mandibular counterclockwise rotation showed stability for point B, pogonion, and menton referred to X-Y coordinate, and for mandibular plane angle. The mean value for each variable was compared between T2 and T3. No statistically significant change was observed for all variables.
With a well-positioned maxilla, skeletal open bite can be successfully treated using M-ILO. Mandibular counterclockwise rotation showed stability at 1 yr after surgery.
评估采用改良倒L形截骨术（M-ILO）及下颌骨逆时针旋转并辅以坚固内固定治疗骨性开牙合患者的外科正畸稳定性。
在一项回顾性研究中，对2004年至2007年期间于东北大学医院接受下颌M-ILO手术的12例骨性开牙合患者（8例女性，4例男性）进行了研究。在手术前即刻（T1）、手术后即刻（T2）以及手术后1年（T3）拍摄头颅侧位片。在指定时间间隔对B点、颏前点、颏下点及下颌平面角进行头影测量分析。
下颌骨逆时针旋转在X-Y坐标系中对于B点、颏前点和颏下点以及下颌平面角显示出稳定性。比较了T2和T3时各变量的平均值。所有变量均未观察到统计学上的显著变化。
在上颌位置良好的情况下，使用M-ILO可成功治疗骨性开牙合。下颌骨逆时针旋转在术后1年显示出稳定性。
