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第一恒磨牙是第一个萌出的恒牙,大约在六岁故又名“六龄牙”,先天缺失甚为少见,现将所遇1例报道如下。
The first permanent molars is the first eruption of permanent teeth, about six years old also known as “six-year-old teeth”, birth defects are rare, now encountered in 1 case reported as follows.