Pancherz分析法评估Twin-block矫治器矫治骨性Ⅱ类错的骨牙效果

Pancherz's analysis in evaluating the treatment effects of Twin-block appliance for class Ⅱ malocclusion

目的:探讨Twin-block功能矫治器早期矫治骨性Ⅱ类错所引起的牙、牙槽以及颌骨的变化。方法:对23例处于生长发育期的以下颌后缩为特征的Ⅱ类患者进行Twin-block功能矫治,对其治疗前后硬组织X线头影测量进行Pancherz分析。结果:治疗后,磨牙关系与前牙覆盖得到改善,下颌向有利的方向发育。前牙覆盖的改善51%为骨骼因素,49%为牙性因素。磨牙关系的改善66%为骨骼因素,34%为牙性因素。结论:Twin-block矫治器对骨性Ⅱ类错的矫治是有效的,包括矫形作用与正畸作用。

Objective：To evaluate the effects of Twin-block functional appliance on basal bone and dentition of juveniles with skeletal classⅡmalocclusion.Method：23 patients in growth with Angle Class Ⅱ malocclusion and mainly with mandibular retrognathia were investigated.Lateral cephalometric X-rays were taken and measured before and after treatment.The data were analyzed with Pancherz＇s cephalometric analysis.Result：Molar-relationship and overjet of the incisors were improved,Mandibular development was favorable after treatment.The change of Molar-relationship consisted of 51% skeletal factor and 49% dental factor;The change of overjet consisted of 66% skeletal factor and 34% dental factor.Conclusion：Twin-block functional appliance was effective in correcting Class II malocclusion,including the orthopedic and orthodontic effects.