X-RAY PHOTOELECTRON SPECTROSCOPIC (XPS) STUDY OF DENTIN APATITE TREATED WITH FLUORIDE ION

Abstract

The reaction of NaF with hydroxyapatite is of interest owing to the dental application. A main constituent of dental hard tissue is not the stoichiometric hydroxyapatite (HAP) but a carbonate-hydroxyapatite (CHAP). In present study, the reaction of bovine dentin as a CHAP with NaF has been investigated. XPS studies have shown that the dentin behaved similarly to the noncarbonated HAP as far as formation of fluoridated hydroxyapatite (FHAP) was concerned. However, it has also been found that CaF₂ was formed even in neutral conditions in contrast to the case of stoichiometric HAP.