[Effects of acidic phosphate fluoride on the protein compositions of acquired pellicle in vitro]

The human enamel powders treated with acidic phosphate fluoride (APF) were used to react with human mixed saliva and purified proteins. Before and after treated with APF, the changes of fluoride content in the enamel and the salivary proteins adsorbed on the enamel surfaces were noticed. The results are as follows: 1. The post-treated enamel fluoride is increased, and the production is fluorapatite besides a little CaF2. 2. No effect of APF on the kind of salivary proteins adsorbed on the enamel is found. 3. The quantity of salivary proteins adsorbed on the enamel is increased in different percentage and the proportion of the proteins on the enamel surface may be changed. Therefore, we believe that these changes must be one of the APF's mechanisms on caries prevention.