安氏Ⅱ类1分类错非常规拔牙模式矫形的临床观察

The clinical observation of non-conventional extraction mode with class Ⅱ division 1 malocclusion

目的:观察安氏Ⅱ1错患者采用双侧上颌第一前磨牙和单侧下颌中切牙的拔牙模式固定矫治前后软硬组织的变化,探讨此种拔牙模式的适应证。方法:选择25例的安氏Ⅱ1分类重度深覆盖患者,拔除双侧上颌第一前磨牙和单侧下颌中切牙,使用MBT技术进行矫治,通过头影测量分析,比较治疗前后7项硬组织项目和5项软组织项目的变化。结果:采用此拔牙模式,重度Ⅱ1错患者覆、覆盖减小,尖牙、磨牙关系得到调整,软组织侧貌协调性得以明显改善。结论:拔除双侧上颌第一双尖牙和单侧下中切牙模式的适应证为重度Ⅱ1深覆、深覆盖低角成人患者。

Objectives To investigate the changes in the hard tissue and the soft tissue profile before and after treatment in Angle Class Ⅱ 1 malocclusion with deep overjet and deep overbite treated by extraction of two maxillary first premolars and one mandibular central incisor. Methods 25 adult patients with Angle Class Ⅱ 1 malocclusion, including 14males and 11 females, aged from 18.3 to 30.5 years old, were treated by extracting two maxillary first premolars and one mandibular central incisor using MBT technique. Pretreatment and posttreatment of cephalograms of individual were traced. Seven landmarks of the hard tissue and five landmarks of the soft tissue profile were selected and analyzed. Results The individual normal occlusion was achieved and the soft tissue profile was improved when the orthodontic treatment completed. Conclusion This orthodontic extraction mode can be used to treat severe Angle Class Ⅱ 1 adults with deep overjet,deep overbite and hypodivergent skeletal pattern.