青少年双颌前突患者矫治后软硬组织变化的头影测量分析

Study on the Relationship between Soft and Hard Tissue of Bimaxillary Protrusion Adolescence Patient in Cephalometric Analysis

目的探讨青少年双颌前突患者拔牙矫治后软硬组织的变化及其比例。方法选择拟拔除4颗第一前磨牙矫治的青少年上颌前突患者20例,矫治前后拍X线头颅侧位片,进行X线头影测量,对测量数据进行统计学分析。结果青少年患者矫治后上唇与上切牙内收比例为0.71∶1,下唇与下切牙的内收比例为0.28∶1;切牙的唇倾度减小,SND角增大(t=3.62,P<0.01);下颌平面角(t=2.14,P<0.05)、平面角(t=2.37,P<0.05)减小;上唇厚度(t=1.35,P>0.05)、下唇厚度(t=1.45,P>0.05)无变化;鼻点到H线的距离(t=9.85,P<0.01)、鼻唇沟到H线的距离(t=3.62,P<0.01)和颏唇沟到H线的距离(t=3.91,P<0.01)均减少。结论双颌前突青少年患者侧貌的改善是由于在上、下唇内收的同时下颌骨仍具有向前生长的潜力,下颌平面逆时针旋转以及上唇内收比例比下唇大1倍等共同作用的结果。

Objective To study the changes and relationship of hard tissue before and after orthodontic treatment for bimaxillary protrusion adolescence patient in cephalometric analysis.Methods Twenty cases of bimaxillary protrusion adolescence patients were treated by 4 premolars extraction.Cephalometric analysis was carried out before and after the treatment.Data were analyzed by paired t-test.Results The proportional change of hard and soft tissue was 0.71∶1 in maxillary and 0.28∶1 in mandibular.There were significant decreases in the incisors＇ lip inclination,mandibular plane,occlusion plane（P0.05）,nose,nasolabial and Chin lip groove to H line（P0.01）,while increasing in ∠SND（P0.01）.There was no significant differences in the lip thickness（P0.05）.Conclusion There are various factors for bi-maxillary protrusion adolescence patient to get better profile,lips retraction,mandibular growth,mandibular plane counter-clockwise rotating and the proportional change of hard and soft tissue in maxillary twice than in mandibular.