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目的:建立上海地区正常成人图形质心分析法(centrographic analysis,CGA)的正常范围。方法:选取上海地区汉族正常成年人75名(男34名,女41名),年龄18～21岁。拍摄X线头颅侧位定位片,进行图形质心分析。并与高加索人的面部形态进行比较。采用SAS9.2软件包对所得数据进行统计学分析。结果:获得上海地区正常成人图形质心分析法的正常范围,其中面部质心位于Ba-A线上;面上部质心位于质心平面上;面下部质心位于质心平面前方0.92～1.29mm;下切牙长轴经过下颌骨性联合部的后1/3;上切牙长轴经过眶点后方,并与下切牙形成良好的覆、覆盖关系;上下唇前缘位于外平面处。各测量指标在男女性别之间无显著差异(P>0.05)。结论:正常成人X线头影的图形质心分析存在地区和种族差异,与高加索人相比,上海人下颌位置相对靠前,上、下切牙唇倾,面下1/3软组织略突。
Objective: To establish the normal range of centrographic analysis (CGA) of adults in Shanghai. Methods: 75 adults (34 males and 41 females) with normal age of 18 to 21 years were enrolled in this study. Shooting X-ray cephalometric positioning film, graphics centroid analysis. And compared with the Caucasian facial morphology. SAS9.2 software package for statistical analysis of the data obtained. Results: The normal range of normal centroid analysis in Shanghai was obtained, in which the centroid of the face was located on the Ba-A line, the centroid of the top face was on the centroid plane, the centroid of the inferior face was 0.92-1.29 mm in front of the centroid plane, After the mandibular joint of the latter 1/3; the incisor long axis after the orbital point behind, and the lower incisors form a good coverage, covering the relationship; the upper lip lip is located at the outer plane. There was no significant difference between male and female in each measurement index (P> 0.05). CONCLUSIONS: There is a regional and ethnic difference in centroid analysis of normal adult X-cephalography. Compared with Caucasians, Shanghai people have relatively lower mandibular positions.