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目的:运用PAR指数评价蛙式矫治器远移上颌磨牙治疗安氏Ⅱ类错的矫治效果。方法:选取蛙式矫治器治疗的安氏Ⅱ类错病例20例,运用PAR指数对每一病例矫治前后的石膏模型进行测量评价,对实验结果用SPSS13.0软件进行统计分析。结果:20例病例PAR总分值矫治前后分别17.72±3.48,2.28±1.63减少15.44±2.76,差异有极显著性(P<0.01);加权PAR总分矫治前后27.25±5.68,3.70±2.58,减少23.55±3.97,差异有显著性(P<0.01);PAR总分值加权前后减少百分率分别为89.61%,86.42%。结论:通过PAR指数的评价认为蛙式矫治器通过远移上颌磨牙可以有效治疗部分安氏Ⅱ类错。
PURPOSE: To evaluate the effect of frog appliance on the treatment of Class Ⅱ malocclusion by maxillary molars with PAR index. Methods: Twenty cases of Class Ⅱ malocclusion treated with frog appliance were selected. The PAR index was used to evaluate the gypsum model before and after each treatment. The experimental results were analyzed by SPSS 13.0 software. Results: Before and after treatment, the total scores of PAR in 17 cases were 17.72 ± 3.48 and 2.28 ± 1.63, respectively, decreased by 15.44 ± 2.76 (P <0.01); The weighted total score of PAR was 27.25 ± 5.68,3.70 ± 2.58 23.55 ± 3.97, respectively (P <0.01). The percentage reduction of PAR score before and after weighting was 89.61% and 86.42% respectively. CONCLUSIONS: PAR index evaluation suggests that the frog appliance can effectively treat some Class Ⅱ malocclusions by distally moving the maxillary molars.