[A comparison of incidence of dental caries among primary and middle school pupils in Shanghai at 1982 and 1990].


In 1982 and 1990, two epidemiological surveys of dental caries of primary and middle school in Shanghai were carried out, using similar standards and methods. A comparison of the results revealed that: the incidence of caries of milk teeth continued to stay at a high level; the incidence of caries of permanent teeth showed a marked reduction. There was no… (More)


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