儿童下颌后缩畸形的双期矫正治疗

Double period correction of children's mandible retrusion

目的 介绍一种儿童下颌后缩畸形的矫治方法。方法 Ⅰ期治疗用Activator +口外弓矫治 ,改善上下颌骨矢状不调。Ⅱ期用直丝弓矫治器进一步稳定上下颌骨关系 ,精确调整牙位与牙合位。结果 经X线头影测量 :SNB增加 2 .4° ,Go Pg增加 2 .5mm ,Z Angle增加 3.99° ,ANB减少 2 .8° ,|—SN减少 6 .10° ,|—MP减少 3.2 6°。结论 双期矫治儿童下颌后缩畸形是较好的方法之一。

Objective To introduce a correction of children's mandible restrusion. Methods Using activator and facebow in period Ⅰ to improve mesial discrepancy of bone maxillary and mandibulary eary and to obtain good facial contour.Using straight wire appliance in period Ⅱ to ballast the relationship between bone maxillary and mandibulary and to control exactly whole dental position and bite position. Results Cephalometric analysis measurement:SNA increasing 2.4 °,Go Pg increasing 2.5 °,Z Angle increasing 3.99 °,ANB reduce 2.8 °, | -SN reduce 6.1 °, | -MP reduce 3.26 °. Conclusion Double period correction is one of the good methods.