早期骨性安氏Ⅲ类错[牙合]畸形治疗预后预测的临床研究

目的：探讨早期骨性安氏Ⅲ类错[牙合]患者早期治疗的预后预测指标,为临床筛选手术治疗和非手术治疗提供依据。方法：100例成人及青少年分成5组,正常[牙合]成人组20例,正常[牙合]青少年组20例,骨性安氏Ⅲ类错[牙合]成人组28例,早期骨性安氏Ⅲ类错[牙合]治疗组24例,早期骨性安氏Ⅲ类错[牙合]治疗失败组8例。在头颅侧位定位片上测量腭平面角、面角、AB平面角、APDI值、ODI值、KIX值。采用SAS6.12软件包进行统计学分析。结果：正常人KIX的平均值在1.2以下。早期治疗组患者治疗前KIX值均值为1.51,治疗后KIX值均值减小为1.36。早期治疗失败的患者KIX值均值为1.81,治疗后为1.83。各组间比较均有高度显著性差异,P〈0.001。结论：手术和非手术治疗的KIX指标临界值为1.5,可作为早期治疗和延期治疗的初步筛选的指标之一。

Prediction of treatment outcome on early skeletal Class Ⅲ malocclusion

PURPOSE： To evaluate the KIX value, is the ratio of APDI and ODI, as a parameter to predict the prognosis of treatment on early skeletal Class Ⅲ malocclusion. METHODS： One hundred adults and adolescent were divided into 5 groups according to age and occlusion, including 20 cases of adult normal occlusion, 20 youngster normal occlusion, 28 adult skeletal Class Ⅲ malocclusion, 24 early skeletal Class Ⅲ malocclusion, 8 early skeletal Class Ⅲ malocclusion with failed treatment. Cephalometric analysis was performed with lateral cephalogram including FH-PP, FH-NPg, AB-NPg, APDI, ODI, KIX. The data was analysed with SAS6.12 software package for Student＇s t test. RESULTS： The average KIX value in control group was less than 1.2. In successful treatment group, KIX value changed from 1.51 to 1.36 after treatment. There was no difference in unsuccessful treatment group, which changed from 1.81 to 1.83. There was significant difference between normal group and skeletal Class Ⅲ malocclusion group, P〈0.001. CONCLUSIONS： The KIX threshold value between surgery and non-surgery is 1.5. It indicates that KIX value can be used as an indicator for early treatment on patients with skeletal Class Ⅲ malocclusion.