西安地区Ⅲ类错颅面类型矢状向构成分析

Component analysis of sagittal craniofacial morphology in Class Ⅲ malocclusion patients in Xi'an area

目的分析西安地区Ⅲ类错颅面类型矢状向的构成,对临床制定合理的矫治方案提供一定的依据。方法采用计算机辅助X线头影测量技术,对第四军医大学口腔医院正畸科2003～2008年间就诊的1177例Ⅲ类错患者的颅面类型进行回顾性研究,统计分析Ⅲ类错矢状向的构成。结果Ⅲ类错患者替牙期分类构成中,矢状向主要表现为上颌正常,下颌发育过度;其次为下颌正常,上颌发育不足。其它类型占比例较低。恒牙早期患者矢状向主要表现形式为双颌发育基本正常或上颌正常,下颌发育过度。恒牙期Ⅲ类错的主要表现形式为上颌正常,下颌发育过度。其次为上颌发育不足伴下颌发育过度。结论西安地区Ⅲ类错矢状向颅面类型在不同年龄段的构成存在一定差异,但总的来说下颌前突仍是Ⅲ类错的主要表现形式。

Objective To analyze the sagittal craniofacial morphology composition in Class Ⅲ patients in Xi＇an area.Methods The craniofacial type of the Class Ⅲ malocclusion in 1177 patients were analyzed.The features of Class Ⅲ malocclusion patients in mixed dentition,early permanent dentition and permanent dentition were studied by computer-aided cephalometric X-ray.Then the component analysis of sagittal craniofacial morphology was performed.Results In the mixed dentition,the craniofacial types in sagittal directions mainly manifested as normal maxilla with mandiblar hyperplasia followed by normal mandible with maxillary hypoplasia.Craniofacial types in sagittal directions were normal maxilla and mandible or normal maxilla with mandibular hyperplasia in early permanent dentition.In permanent dentition,craniofacial types in sagittal directions mainly showed normal maxilla with mandibular hyperplasia followed by maxillary hypoplasia with mandibular hyperplasia.Conclusions Class Ⅲ patient has different sagittal features in different ages,but mandibular hyperplasia is still the main manifestation.