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.
结论：前牙反牙合使得上颌牙齿的错位及发育异常明显增加。
Conclusion: The possibility of ill-position and heteroplasia of teeth in maxilla increases in the patients with anterior crossbite.
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