方法：采用临床、实验室检查方法对3例患儿进行详细的体检，并分析导致出现牙根发育不良表型的遗传学因素。
METHODS: 3 children with hypoplasia of teeth were examined and analyzed carefully by clinical examination and laboratory test to find the genetic factors.
方法：采用临床、实验室检查方法对3例患儿进行详细的体检，并分析导致出现牙根发育不良表型的遗传学因素。
METHODS: 3 children with hypoplasia of teeth were examined and analyzed carefully by clinical examination and laboratory test to find the genetic factors.
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