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龋齿在美国是一种很普遍的疾病,罹及98%的居民。使公共饮水中氟含量控制到最合适的浓度已证明是减少龋齿最有效的公共卫生方法,最合适的浓度指的是氟在水中的含量能使抗龋效果最好而氟中毒(牙齿变色或发育不全)又最轻。近年来反对饮水氟化的人们认为饮水氟化增加了肿瘤死亡率。过去,反对饮水氟化的学者们把饮水氟化与过敏症、先天愚钝、心脏疾患及肿瘤相联系。Rapaport氏在1959年的研究中认为先天愚钝在饮水氟化区的居民中比非氟化区居
Dental caries is a common disease in the United States and affects 98% of residents. The control of fluoride concentrations in public drinking water to the most suitable concentrations has proven to be the most effective public health method for reducing dental caries. The most suitable concentration is the concentration of fluorine in water which gives the best anti-caries effect and fluorosis (discoloration of the teeth or Underdeveloped) and the lightest. In recent years, people who oppose fluoridation of drinking water believe that fluoridation of drinking water increases tumor mortality. In the past, academics opposed to fluoride in drinking water linked fluoride to drinking water to allergies, idiopathic dullness, heart disease and cancer. In a 1959 study Rapaport's study found that birth defects were more common in non-fluoridated residents than those in drinking-