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。
Some had different degree defect of dentition, deciduous tooth retention, caries or periodontitis.
有些病例伴有牙列缺损，有些病例还有乳牙滞留、龋病、牙周病等。
Some had different degree defect of dentition, deciduous tooth retention, caries or periodontitis.
有些病例伴有牙列缺损，有些病例还有乳牙滞留、龋病、牙周病等。
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