青少年双颌前突患者拔牙矫治前后颅颌面结构改变的研究

Study of cranio-facial changes after orthodontic treatment with four premolars extracted in bimaxillary protrusion in adolescents

目的研究青少年双颌前突患者拔牙矫治前后颅颌面结构的改变。方法对34例青少年双颌前突患者拔牙矫治前后的11项颅颌面结构指标进行对比,通过配对t检验来分析治疗后颅颌面结构的变化。结果8项角度指标在男性组与女性组矫治前后的改变均无统计学意义,3项线距测量指标S-N、S-ANS和S-Gn在男性组和女性组矫治前后的改变均有统计学意义,男性组S-N平均增大2.02mm,S-ANS平均增大3.31mm,S-Gn平均增大5.73mm。女性组S-N平均增大2.03mm,S-ANS平均增大2.82mm,S-Gn平均增大4.83mm。结论青少年双颌前突患者拔牙矫治前后上颌骨、下颌骨及前颅底的生长方向在治疗前后无变化,但3者的生长速度不同。

Objective To study the cranio-facial changes after orthodontic treatment with four premolars extracted in bimaxillary protrusion in adolescents. Methods 34 bimaxillary protrusion＇ s adolescents were selected and 11 cranio-facial controls were compared before and after or thodontic treatment with paired t-test to evaluate the cranio-facial changes. Results 8 angular measurements did not statistically change in male and female , 3 linear measurements statistically changed, S-N increased by 2.02 mm, S-ANS increased by 3.31 mm, S-Gn increased by 5.73 mm in male and S-N increased by 2.03 mm, S-ANS increased by 2.82 mm, S-Gn increased by 4.83 mm in female. Conclusion There is no change in development directions of maxilla, mandible and SN before and after orthodontic treatment for bimaxillary protrusion＇ s adolescents with four premolars extracted, but there are differences in development rates.