前方牵引治疗早期Ⅲ类错预后的头影测量指标筛选研究  

Cephalometric variables to predict prognosis of early Class Ⅲ malocclusion treated by face mask

作　　者：王秋玉[1] 李雷[1] 刘一儒[1] 颜冬[1] 李宁宁 王鹤橙 朱宪春[1] WANG Qiuyu;LI Lei;LIU Yiru;YAN Dong;LI Ningning;WANG Hecheng;ZHU Xianchun.(Department of Orthodontic, Stomatological Hospital of Jilin University, Changchun 130021, China)

机构地区：[1]吉林大学口腔医院正畸科,吉林长春130021

出　　处：《口腔医学》2018年第4期342-345,共4页Stomatology

摘　　要：目的本研究从骨性Ⅲ类错患者的矫治前头影测量指标中筛选出能够预测长期矫治效果的指标。方法选取40例Ⅲ类错的女性患者,初始矫治平均年龄为7.3岁,拍摄头颅侧位片,进行前方牵引治疗。在生长发育结束根据覆盖、磨牙关系和面型将患者分为两组:治疗成功组(20例)和未成功组(20例)。将以上两组的头影侧位片测量指标进行统计学分析。结果通过统计学分析筛选得到可以预测矫治预后的3个头影测量指标:S-Ar距离(后颅底长),Pt-SBL距离(翼上颌裂到基准平面距离),AB-MP角度(AB-下颌平面夹角)。S-Ar距离增大,Pt-SBL距离减小,AB-MP角度增大提示治疗预后良好,预测准确率达92.5%。结论 S-Ar距离,Pt-SBL距离,AB-MP角度可作为前方牵引治疗早期Ⅲ类错预后的头影测量指标。Objective To investigate cephalometric variables that might predict the outcomes of orthopedic treatment with RME and face mask therapy（ FM）. Methods Cephalometric analysis of 40 Class Ⅲ patients（ mean age of 7 years and 4 months） was performed at treatment onset. After the pubertal growth completion,patients were divided into two groups： success group（ 20 individuals）and failure group（ 20 individuals） according to overjet and molar relationships. Discriminant analysis was applied to the cephalometric values at treatment onset. Results Three predictor variables were found by stepwise procedure. The probability of successful treatment was an increasing function of S-Ar and AB-MP,and a decreasing function of Pt-SBL. The results of treatment with RME and face mask therapy at growth completion in Class Ⅲ patients could be predicted with a probability of 92.5%. Conclusion These results suggest that Class Ⅲ growing patients with small posterior basal length,the lower position of the pterygoid,and obtuse chin angle are highly associated with unsatisfactory treatment outcomes after pubertal growth.

关 键 词：安氏Ⅲ类错[牙合] 预后 判别分析 

分 类 号：R783.5[医药卫生—口腔医学]