遗传因素对牙齿数目异常起主导作用。
The anomaly of tooth number is mostly due to hereditary factors.
目的调查青年人恒牙牙齿形态和数目异常的状况。
Objective To investigate the status of number and morphology anomalies in the permanent teeth.
目前研究发现多种遗传性疾病都能影响到牙齿的发育，表现为牙齿结构、形态、数目和萌出等方面的异常。
It has been proved that many kinds of genetic diseases can influence the development of tooth, with symptoms of abnormalities in tooth structure, appearance.
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