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为探讨我省饮水型地方性氟中毒流行区适宜水氟浓度,对饮水氟含量分别为0.90mg/l、1.59mg/1、1.90mg/l、3.37mg/l的四地区7—14岁在校生进行氟斑牙患病情况调查。结果:氟斑牙率依次为0、2.33%、56.78%、70.74%。斑釉指数依次为0.02、0.05、1.60、2.24。氟斑牙病损程度显示,当水氟浓度在1.59mg/1时,牙齿正常者占95.35%,可疑、极轻和轻度病例总计占4.65%,水氟浓度为1.90mg/L中,重度病例分别为34.75%、5.93%,水氟浓度达3.37mg/l,中、重度病例分别为32.45%、25.53%。水钙浓度达80—90mg/l时,患病率在0—2.33%,水钙降至33.31mg/l时,患病率达70.74%。综合上述结果提示:在饮水型地氟病区,当水氟浓度较高时,如水硬度亦高,其水氟上限可放宽至1.5mg/l。
In order to explore the appropriate fluoride concentration in drinking water endemic fluorosis in our province, the fluoride content of drinking water were 0.90mg / l, 1.59mg / 1, 1.90mg / l, 3.37mg / Students to dental fluorosis investigation. Results: The rates of dental fluorosis were 0,2.33%, 56.78% and 70.74%, respectively. Spot glaze index were 0.02,0.05,1.60,2.24. The degree of dental fluorosis showed that when the water fluoride concentration was 1.59mg / 1, the normal teeth accounted for 95.35%, suspicious, extremely light and mild cases accounted for 4.65%, water fluoride concentration was 1.90mg / L, severe Cases were 34.75%, 5.93%, water fluoride concentration of 3.37mg / l, moderate and severe cases were 32.45%, 25.53%. When the concentration of calcium in the water reaches 80-90mg / l, the prevalence is 0-2.33%. When the water calcium is reduced to 33.31mg / l, the prevalence is 70.74%. The above results suggest that in drinking-water endemic fluorosis area, when the water fluoride concentration is high, the water hardness is also high, and the water fluoride upper limit can be relaxed to 1.5 mg / l.