关于氟化物预防龋病的研究已有40余年的历史,大量的临床实践证明,无论全身或局部应用都是有效的。但由于用法不同,取得的效果差异甚大,是否借助直流电场的作用将氟离子直接透入牙体组织内,对提高低氟区龋病易感儿童的预防效果更为可取是一个值得研究的课题。为此,我科从1982年12月起在成都市区 More than 40 years of research on the prevention of dental caries by fluoride have been reported. A great deal of clinical practice has proved that it is effective both for systemic and local application. However, due to the difference in usage, the effect obtained is quite different. It is more worth to study whether the direct effect of DC electric field can directly penetrate fluoride ions into dental tissues, which is more advisable to improve the prevention of caries-susceptible children in the low fluoride area . To this end, our department from December 1982 in Chengdu area