拔除下颌第一磨牙矫治错畸形的疗效分析

Analysis of the therapeutic effects of orthodontic therapy with mandibular first molar extraction

目的:评价拔除下颌第一磨牙治疗错畸形的疗效。方法:根据拔牙方式将77例错畸形患者分为常规拔除第一前磨牙组30例、单侧拔除第一磨牙组27例和双侧拔除第一磨牙组20例;测量矫治前后OGS各指数变化情况并进行统计学分析。结果:3组正畸治疗后牙均有显著的改善(P<0.01),但3组的改变量无明显差异(P>0.05);3组正畸后OGS指数有显著差异(P<0.05),双侧拔除第一前磨牙组优于双侧拔除第一磨牙组(P<0.01),双侧拔除第一磨牙组优于单侧拔除第一磨牙组(P<0.01)。结论:拔除第一磨牙矫治能取得较好的矫治效果,但拔除第一前磨牙在后牙的矫治中效果更好。

Objective：To evaluate the therapeutic effects of orthodontic therapy with mandibular first molar extraction.Methods：77 cases of malocclusion were divided into 3 groups：Bilateral mandibular first premolar extraction group（A,30 cases）,unilateral man-dibular first molar extraction group（B,27cases）and bilateral mandibular first molar extraction group（C,20 cases）.The OGS indexes were measured before and after orthodontic treatment and statistically analysed.Results：Remarkable occlusal improvement was seen in all three groups after treatment（P〈0.01 ）,but the variation of OGS indexes had no significant difference among the 3 groups（P〉0.05）.OGS indexes among the three groups after treatment were significantly different（P〈0.05）.The improvement in group A was more significant than that in group C（P〈0.01）and the improvement in group C was more significant than that in group B（P〈0.01）. Conclusion：Orthodontic therapy with bilateral mandibular first molar extraction is effective in orthodontic treatment of malocclusion, but is not as effective as that with bilateral mandibular first premolar extraction.