CAJ | 학술논문

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.
목적 통과대안씨Ⅱ류착(아합)환자진행아형화분,분석Ⅱ류환자적형태특정급기형성궤제.방법 수집북경대학구강의학원정기과1997～2000년취진적안씨Ⅱ류착(아합)환자894명,통과영상측량급최소평방화중첩법(Procrusts Superimpositiom,PS)진행취류분석이급아형화분,분석매조적로면특정,총결기형성궤제.결과 취류분석장양본분출11개구유각자형태특정적류형,병형성각자적도형모판.결론 PS중첩법용우형태학분류구유일정적우세.안씨Ⅱ류착(아합)적주요궤제위하합후축,병차약60%존재수직향불조,기중고각병례경가다견.
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.