摘要
目的 通过对安氏Ⅱ类错（牙合）患者进行亚型划分,分析Ⅱ类患者的形态特征及其形成机制.方法 收集北京大学口腔医学院正畸科1997～2000年就诊的安氏Ⅱ类错（牙合）患者894名,通过影像测量及最小平方和重叠法（Procrusts Superimpositiom,PS）进行聚类分析以及亚型划分,分析每组的颅面特征,总结其形成机制.结果 聚类分析将样本分出11个具有各自形态特征的类型,并形成各自的图形模板.结论 PS重叠法用于形态学分类具有一定的优势.安氏Ⅱ类错（牙合）的主要机制为下颌后缩,并且约60%存在垂直向不调,其中高角病例更加多见.
Objective To analyze the morphological characters and mechanism of Class Ⅱpatients. Methods 894 Class Ⅱ patients were collected from the orthodontic department, Peking University School of Stomatology from 1997 to 2000. The standardized coordinates of thecephalometric radiograms were obtained by Procrusts Superimposition （PS）. Cluster analysis was carried out to divide the patients into different subdivisions and the cephalometric character of each template was analyzed. Resulst 894 patients were divided into 11 subdivisions with specialcharacteristics. The morphological templates were constructed by computer. Conclusions Procrusts method was effective to study the classification of the malocclusion. According to the template and its cephalometric value, Class Ⅱ malocclusion were mainly due to the mandiblar retrusion, and verticaldiscrepancy present in 60percent of the patients.
出处
《中华口腔正畸学杂志》
2010年第3期160-162,共3页
Chinese Journal of Orthodontics
基金
资金资助：国家“863”计划资助项目（编号：2001AA111392-3）
