PAR指数评价安氏Ⅱ类1分类错畸形单颌拔牙和双颌拔牙的矫治效果

Assessment of Upper Jaw Extraction versus Upper and Lower Jaw Extraction Treatment for ClassⅡ Division 1 Malocclusion Using Peer Assessment Rating Index

目的采用PAR指数评价上颌单颌拔牙和双颌拔牙矫治安氏Ⅱ类1分类错畸形的效果。方法选择52例安氏Ⅱ类1分类错患者,分为两组:单颌拔牙矫治组28例,双颌拔牙矫治组24例。采用PAR指数对两组患者矫治前后的牙齿排列、磨牙关系、覆盖、覆及中线情况进行评估和比较。结果双颌拔牙组患者的牙齿排列、PAR总分和加权总分在矫治前大于单颌拔牙组,矫治后与矫治前的差值亦大于单颌拔牙组(P<0.05),而两组患者矫治后PAR各项分值均无统计学差异(P>0.05)。结论双颌拔牙组患者的错较单颌拔牙组复杂,主要表现在牙齿拥挤方面;只要设计合理,适应证选择得当,两者均能获得良好的矫治效果。

Objective To assess the outcome of orthodontic treatment with upper jaw or upper and lower jaw extraction for Class Ⅱ division 1 malocclusion using the peer assessment rating（PAR） index. Methods 28 patients with Class Ⅱ division 1 were extracted two first premolars or second premolars of upper jaw, and 24 patients were extracted four premolars of upper and lower jaw N. The PAR was applied on pre-and pest-orthodontic treatment dental casts for the fifty-two cases. Results The upper and lower jaw extraction groups had significantly higher initial PAR scores and the weighted PAR total scores（P〈0.05）. Although significantly different before treatment, beth groups were not statistically different after treatment （P〉0.05）. Conclusion The upper and lower jaw extraction cases showed more severe dental displacement. Both treatment can acquire successful results.