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1974～1975年,我们对西双版纳州及澜沧县16所中小学学生进行了龋齿发病情况的调查,并对当地13个水源作了含氟量的测定。该地区不同民族患龋率及龋均见表1及图1、2。
From 1974 to 1975, we investigated the incidence of dental caries in 16 primary and secondary school students in Xishuangbanna Prefecture and Lancang County, and determined the fluoride content of 13 local water sources. The caries prevalence and caries in different ethnic groups in this area are shown in Table 1 and Figures 1 and 2.