微种植体支抗在安氏Ⅱ类1分类错牙合治疗中的应用

Effect of micro-implant anchorage in the treatment of Angle Class II division 1 malocclusion

目的：研究微种植体支抗在安氏Ⅱ1错[牙合]治疗中的作用。方法：选取20例临床诊断为安氏Ⅱ1类错牙合的恒牙列患者，年龄18～29岁，平均年龄23.5岁。将患者随机分成两组：微种植体支抗组10例（男5例，女5例），传统支抗组10例（男5例，女5例）。两组均采用拔牙矫治，拔除上、下颌四颗第一前磨牙，应用MBT直丝弓矫治技术。对两组治疗前后的X线头影测量值进行统计分析。结果：应用两种支抗方法都能使上颌切牙的唇倾度和突度发生显著而有利的改变（P＜0.01），而使用微种植体作为支抗可以更大程度内收上前牙；上颌磨牙无明显近移；唇部软组织变化更大，因此面型也改善得更好。而下颌平面角和[牙合]平面在微种植支抗组无明显改变（P＞0.05）。结论：应用微种植体加强支抗治疗安氏Ⅱ1类错[牙合]效果更显著，并且可以缩短疗程，值得临床广泛推广应用。

Objective To investigate the effect of micro- implant （MIA） anchorage in the treatment of Angle Class II Division 1 malocclusion. Methods 20 patients aged 18- 29 years old （23.5 on average） in permanent dentition with Angle Class II Division 1 （II1） malocclusion were selected. Then, they were randomly divided into two groups： Group A （using MIA）： 10 patients （5 males, 5 females）;Group B （using traditional anchorage：Nance arch and trans- palatal arch）：10 patients（5 males, 5 females）.Both groups had four 1st premolars extracted.MBT technique was used in the following orthodontic treatment. Finally we performed statistical analysis on the pre - treatment and post - treatment cephalograms in both groups. Results Both groups had favorable and markedly changes in the inclination and protrusion of upper incisors （P〈0.01）.The using of MIA could retract upper anterior teeth at greater degree with little mesial movement in the upper molars.In group A,greater change in the labial soft tissues was found and facial aesthetics was obviously improved. Moreover, the mandibular plane and occlusal plane had little alterations （P〉0.05）. Conclusion Compared with traditional anchorage, MIA has been proved to be more efficient in the treatment of Angle Class II1 malocclusion with shorter treatment time. It should be largely recommended in orthodontic clinic.