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作者研究了８３付替牙期正常儿童的牙石膏模型，观察测量其上下颌第二乳磨牙远中末端平面关系、上下颌第二乳磨牙近远中径宽度及其比值、上下颌第一恒磨牙咬合关系。将所得结果与华西医科大学、上海第二医科大学对乳牙期正常形态研究的结果比较分析，结论是：替牙期末端平面以双侧近中型居多；末端平面关系与上下颌第二乳磨牙近远中径宽度比值有一定关系；替牙期下颌第一恒磨牙萌出时即有近中移动趋势，有利于建立正常的中性关系。
The author studied 83 cases of normal periodontal gypsum dentition model, observed the maxillary and mandibular second molar distal end plane relationship, the maxillary and mandibular second molar near and far the width and its ratio, the first jaw Molar occlusion. The results obtained with Huaxi Medical University, Shanghai Second Medical University, the normal morphology of the deciduous teeth of the comparative analysis of the results, the conclusion is: the end of the bipolar plane end to the majority of bilateral mesial; terminal plane relationship with the second lower maxillary molars close There is a certain relationship between the ratio of the width to the width of the medial midline; the maxillary molar movement of the maxillary first permanent molar during the period of eruption is close to normal, which is conducive to the establishment of a normal neutral relationship.