如果婴儿过早的失去牙齿，恒牙可能会爆发式的错位长出而需要正畸。
If baby teeth are lost prematurely, the permanent teeth may erupt malpositioned and require orthodontics later on.
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.
方法：对临床6年期间用金属烤瓷方法修复的各种牙齿缺损、 缺失、 变色、 畸形、 错位等共720名患者计750件修复体的临床观察。
Methods 750 metal-porcelain prostheses in 720 clinical cases such as dentition defect missing, discoloration, abnormity and allotopia etc have been investigated and analysed during 6 years.
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