Diagnostic template research of craniofacial characters of Class II patients

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. Key words: Angle class Ⅱ malocclusion;  Cluster analysis;  Procrusts superimposition