Fluor protector was used to treat the root surface and covered once in half a year.Then we observed the change of the caries prevalence rate and DMFT two years later.
英
美
释义
方法选择197例老年人用氟保护漆来涂布根面,每半年涂布1次,2年后观察根面龋的患龋率、龋均的变化。
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