正常的研究是错畸形诊断的基础 ,本文通过对 89名南京地区正常人恒牙模型的牙弓弧形长度、牙弓垂直长度、牙弓宽度、腭盖高度的测量分析 ,得出了正常人的均值。材　料　和　方　法样本取自南京地区恒牙个别正常的大、中学生 89名 ,其中男性 4 6名 ,女性 4 3名 ,年 Normal  research is the basis for the diagnosis of malocclusion. Through the measurement and analysis of the arch length, the arch length, the width of the arch, the height of the palatal arch of 89 normal permanent dentition model in Nanjing, Out of the average person's average. Materials and Methods The samples were taken from 89 large and middle school students in Hengdian, Nanjing, of which 46 were males and 43 were females