成人骨性安氏Ⅲ类错(牙合)颅面特征头影测量的评价

目的：探讨颅面结构中与骨性Ⅲ错牙合]密切相关的指标，预测骨性安氏Ⅲ类发生的可能性。方法：选择17～27岁骨性安氏Ⅲ类错牙合]患者27例，正常牙合]女性31名、男性32名，测量其面部骨性结构并进行统计学分析。结果：骨性安氏Ⅲ类组，男性后颅底复合体长度明显小于正常组（P〈0．01），下颌复合体三维长度Go—Gn高于正常组（P〈0．01）；女性下颌长度指标Cd—Gn、Go—Gn高于正常组（P〈0．01）。结论：颅面结构中与骨性Ⅲ错牙合]最密切相关的指标具有性别差异。后颅底长度短的男性患者骨性安氏Ⅲ类发生的可能性比较大，通过正颌手术来纠正的可能性大；下颌水平支较长的患者骨性安氏Ⅲ类发生的可能性也比较大。

Morphological characteristics of craniofacial complex in adults with skeletal class Ⅲ malocclusions

OBJECTIVE: To identify the morphological characteristics of craniofacial structure in patients with skeletal class III malocclusions. METHODS: The study samples consisted of 63 lateral cephalometric radiographs of adult with class I malocclusion (32 male and 31 female, ages >17 years) and 27 patients with skeletal class III malocclusion (14 male and 13 female, ages >17 years, ANB >-3). The proportion of posterior cranial base and the mandibular length were measured. RESULT: There was an increase in total mandibular length (Go-Gn, Cd-Gn) in female patients with class III malocclusion. There was a decrease in the posterior cranial base length (S-Ar) and an increase in mandibular length (Go-Gn) in male patients with class III malocclusion. CONCLUSION: The major craniofacial characteristics of skeletal class III malocclusion compared with those of class I malocclusion are smaller posterior cranial base in males and larger mandibular length in both sexes.