X-ray photoelectron spectroscopy study on chemical states of fluoride in bovine dentine treated with NaF

Abstract

The reaction of bovine dentine as carbonate–hydroxyapatite (CHAP) with NaF has been investigated. XPS studies have shown that the dentine behaved similarly to the non-carbonated HAP as far as formation of fluoridated hydroxyapatite (FHAP) was concerned. However, CaF₂ was also formed even in neutral conditions in contrast to the case of stoichiometric hydroxyapatite, and CaF₂ was subsequently transformed partially into FHAP in phosphate buffer solution.