El-Dawlatly M M, Abou-El-Ezz A M, El-Sharaby F A, Mostafa Y A
Department of Orthodontics and Dentofacial Orthopedics, Faculty of Oral and Dental Medicine, Cairo University, Cairo, Egypt.
J Orofac Orthop. 2014 May;75(3):213-25. doi: 10.1007/s00056-014-0214-z. Epub 2014 May 15.
The correction of some Angle Class II malocclusions requires distalization of the upper first molars via an induced orthopedic effect. In the present study, we tested the potential of using a mini-implant to achieve a modified zygomatic anchorage system for Class II correction.
Our study comprised 10 treated and 10 control Class II growing female subjects aged 10-12 years. Orthodontic mini-implants were placed in the zygomatic buttress to act as anchorage for the distalization. The follow-up period was 6 months; treatment changes were assessed by cone beam CT scans.
Compared to the control group, the treatment group showed significant retrusion of point A, anti-clockwise rotation of the maxillary plane, and a mean molar distalization of 2.92 ± 0.69 mm with no extrusion, no tipping or buccal rolling. There was significant upper incisor intrusion (1.89 ± 0.84 mm) with no changes in incisor inclination. No change in the mandibular plane angle was detected.
Use of this technique allowed Class II correction with concomitant reduction in the visible gingiva in the treated subjects without the adverse effects experienced with other appliances.
矫正某些安氏II类错牙合畸形需要通过诱导矫形作用使上颌第一磨牙远中移动。在本研究中，我们测试了使用微型种植体实现改良颧部支抗系统以矫正安氏II类错牙合畸形的可能性。
我们的研究包括10例接受治疗的和10例对照的安氏II类生长发育期女性受试者，年龄在10至12岁之间。正畸微型种植体植入颧突以作为远中移动的支抗。随访期为6个月；通过锥形束CT扫描评估治疗变化。
与对照组相比，治疗组显示A点明显后缩，上颌平面逆时针旋转，磨牙平均远中移动2.92±0.69 mm，无伸长、无倾斜或颊向扭转。上前牙明显压低（1.89±0.84 mm），切牙倾斜度无变化。未检测到下颌平面角改变。
使用该技术可矫正安氏II类错牙合畸形，同时减少治疗受试者可见牙龈，且无其他矫治器的不良反应。
