我们曾对恒牙初期组正常(牙台)儿童牙弓大小的研究,已得出初步结论。为进一步了解儿童牙弓大小的变化,又对替牙阶段正常(牙合)儿童牙弓大小进行研究,观察两者之间的变化规律。为此,收集并测量上海地区替牙期正常(牙合)儿童的牙齿模型,进行统计学处理,现报道如下。 We have on the initial group of permanent dentition normal (dental table) dental arch size, have reached preliminary conclusions. In order to further understand the changes of children's dental arch size, the dental arch size of children with normal occlusion during occlusal period was also studied, and the change rule between them was observed. To this end, collecting and measuring the teeth of normal occlusion children in Shanghai dentition model for statistical analysis, are reported below.