方法：采用逐年取研究模型的纵向研究方法，追踪观察44例正常乳牙列儿童在3 ~5岁期间的牙列发育状况。
Methods: The growth of dentition of 44 children 3 ~ 5 years old with normal deciduous dentition was observed continually.
方法：采用逐年取研究模型的纵向研究方法，追踪观察44例正常乳牙列儿童在3 ~5岁期间的牙列发育状况。
Methods: The growth of dentition of 44 children 3 ~ 5 years old with normal deciduous dentition was observed continually.
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