Methods:This study included 200 children with histories of low birth weight or premature infant, their incidence of the dental caries and developmental enamel defects were surveyed.
方法：选取低出生体重儿、早产儿及正常出生体重儿各2 0 0例进行乳牙龋齿、釉质发育缺陷统计调查。
Developmental defect of enamel and dental caries in 1074 primary school children were investigated using the simplified DDE index.
本研究采用简化的DDE指数，对1074名城乡学龄前儿童进行乳牙釉质发育缺陷和龋齿的现况调查。
Objective To observe the regular rule and the developmental characteristics of pupils dental caries.
目的了解我市小学生龋齿发病特点和规律。
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