Warnakulasuriya K A, Balasuriya S, Perera P A, Peiris L C
Faculty of Dental Sciences, University of Peradeniya, Sri Lanka.
Community Dent Oral Epidemiol. 1992 Dec;20(6):364-7. doi: 10.1111/j.1600-0528.1992.tb00700.x.
The prevalence of dental caries and dental fluorosis was examined in 380 14-yr-old children living in four geographic areas of Sri Lanka with water F-levels of 0.09-8.0 ppm. A reduction in caries prevalence by 43% was recorded in children consuming 0.6-0.79 ppm F- compared to those in low fluoride areas (< 0.4 ppm). Among those consuming drinking water containing < 1.0 ppm F-, however, 32% of the children had mild forms and 9% severe forms of dental fluorosis (Dean's index). Although other sources of F- may contribute to this effect, the prevalence and severity of dental fluorosis seen in low fluoride areas was confirmed to be high in rural Sri Lanka. Our data are comparable with recent findings from other tropical countries, e.g. Kenya and Senegal, and reaffirm that WHO guidelines for the upper limit of F- in drinking water may be unsuitable for developing countries with a hot, dry climate. Current knowledge now enables us to recommend 0.8 ppm as an appropriate upper limit for F- in drinking water supplies for these populations.
对生活在斯里兰卡四个地理区域、水氟含量为0.09 - 8.0 ppm的380名14岁儿童的龋齿和氟斑牙患病率进行了检查。与低氟地区（< 0.4 ppm）的儿童相比，摄入氟含量为0.6 - 0.79 ppm的儿童龋齿患病率降低了43%。然而，在饮用含氟量< 1.0 ppm水的儿童中，32%的儿童有轻度氟斑牙，9%有重度氟斑牙（迪恩指数）。尽管其他氟来源可能导致这种情况，但在斯里兰卡农村低氟地区观察到的氟斑牙患病率和严重程度确实很高。我们的数据与其他热带国家（如肯尼亚和塞内加尔）的近期研究结果相当，并重申世界卫生组织关于饮用水中氟上限的指导方针可能不适用于气候炎热干燥的发展中国家。目前的知识使我们能够建议将0.8 ppm作为这些人群饮用水供应中氟的合适上限。
