上颌第一磨牙合面三尖形变异１例湖北医科大学口腔医院内科江茂霞，杜昌连一般认为上颌第一恒磨牙的牙冠形态比较恒定。作者在一分离的右侧上颌骨标本上，发现上颌第一恒磨牙牙冠变异，现报道如下：该右侧上颌牙槽骨弓仅留有一个牙齿，但从牙槽窝数目的计算和变异牙正位于... The maxillary first molar occlusal triangular variation 1 case of Stomatological Hospital of Hubei Medical University Jiang Maoxia, Du Changlian generally considered the crown of the first permanent molars crown morphology is relatively constant. The authors found that the crown of the maxillary first permanent molars on a separate right maxillary specimens are reported as follows: The right maxillary alveolar bone arch only has one tooth, but the calculation and variation from the number of alveolar fossa Tooth is located in ...