青少年骨性Ⅱ类错前后平面的测量分析

Characteristics of the Anterior and Posterior Occlusal Planes in Adolescents with Skeletal Class Ⅱ Malocclusion

目的:探讨分析青少年骨性Ⅱ类错不同垂直骨面型患者前、后平面的特点。方法:选取青少年骨性Ⅱ类错畸形患者共158例,按垂直生长型将其分为高、低及均角三组,采用Winceph8.0软件对每例患者的头颅侧位定位片进行前、后平面及其相关颌骨指标的定点测量,结果进行统计学分析。结果:前、后平面倾斜度,下颌支角(Go-A)和下颌支倾斜角(RAM-I)均为高角组>均角组>低角组(P<0.05)。结论:青少年骨性Ⅱ类错不同垂直骨面型前后平面存在差异,高角者前后平面更为陡峭,颌骨也表现出相应的形态特征。

Objective To investigate the characteristics of anterior and posterior occlusal planes of adolescents with skeletal classⅡ malocclusion.Methods 158 cases in skeletal class Ⅱ malocclusion were selected,all the cases were divided into 3 groups according to different vertical skeletal types： the high,average and low angle groups.The measurement items of anterior and posterior occlusal planes and the items related to the craniofacial structures were marked and measured on the lateral cephalograms of patients by Winceph 8.0,and the measurements were analyzed statistically.Results Items of occlusal planes in both anterior and posterior occlusal plan inclination angles,Go-A angle and RAM-I angle of the high-angle group were larger than that of average and Low-angle groups,and the items of average angle group were larger than that of Low-angle group too（P〈0.05）.Conclusion There are some differences both in the anterior and posterior occlusal planes among adolescent skeletal class Ⅱmalocclusion patients with different vertical skeletal types.The anterior and posterior occlusal planes in high skeletal type are steeper than other vertical skeletal types,and the craniofacial structures have the corresponding characteristics.