Jenkins G N
Department of Oral Biology, Dental School, Newcastle upon Tyne, United Kingdom.
Proc Finn Dent Soc. 1991;87(4):571-9.
Tea-drinking in very young children has been studied in a British city. The results suggested that the fluoride in tea would, in some cases, be sufficient to influence caries. Clinical findings to some extent supported this. The main purpose of the investigation reported here was to determine maximum possible fluoride intake in adults who were heavy tea drinkers in a fluoridated city and relate it to toxic thresholds. Heavy tea drinkers were traced through Health Visitors and voluntary organizations and the volumes and fluoride concentrations of their drinks were measured. Even the highest intake found (9 mg) is below the probable intake in Bartlett, Texas (8 ppm of fluoride), in relation to which no undesirable symptoms have been reported (Leone et al. 1954). This confirms the safety of fluoridation. The effects on fluoride concentration of evaporating soft and hard fluoride-containing waters to small bulk were compared. The results showed ceilings of 3 ppm of fluoride in hard water and about 14 ppm in soft water, much higher than the levels expected on the basis of the usually stated solubility of CaF2 (16 or 8 ppm of fluoride). However, under normal household conditions, it is most unlikely that dangerous levels of fluoride would be ingested from boiled water.
在英国的一个城市对幼儿饮茶情况进行了研究。结果表明，茶中的氟在某些情况下足以影响龋齿。临床发现从某种程度上支持了这一点。本文报道的调查的主要目的是确定在一个实行氟化处理的城市中重度饮茶成年人的最大可能氟摄入量，并将其与毒性阈值相关联。通过健康访视员和志愿组织追踪重度饮茶者，并测量他们所饮茶水的量和氟浓度。即使发现的最高摄入量（9毫克）也低于得克萨斯州巴特利特（氟含量为8 ppm）的可能摄入量，关于后者尚未报告有不良症状（莱昂内等人，1954年）。这证实了氟化处理的安全性。比较了将含氟的软水和硬水蒸发浓缩至小体积时对氟浓度的影响。结果显示硬水中氟的上限为3 ppm，软水中约为14 ppm，远高于根据通常所说的氟化钙溶解度（16或8 ppm氟）预期的水平。然而，在正常家庭条件下，从煮沸的水中摄入危险水平氟的可能性极小。
