title: Fluoridation of hydroxyapatite powder by ammonium hexafluorosilicate.
abstract: Diamine silver fluoride [AgF: (NH3)2AgF] is a unique fluoride solution used clinically in Japan for primary teeth. AgF has been shown to reduce dental caries and dentine hypersensitivity. However, AgF also stains teeth black due to sulfide precipitation and thus is unacceptable for permanent teeth. In the present study, the potential value of ammonium hexafluorosilicate [SiF: (NH4)2SiF6], which has a formula similar to that of AgF but contains no Ag, was studied with respect to its ability to fluoridate apatite. Hydroxyapatite [HAP: Ca10(PO4)6(OH)2] powder was treated with several topical fluoride solutions, i.e. neutral sodium fluoride, acidulated phosphate fluoride (APF) along with AgF and SiF. Following treatment, the HAP powders were analyzed for their fluorine content, crystallinity changes, and solubility in acidic solution. The highest level of fluoridated HAP [FAP: Ca10(PO4)6(OH)xF2-x] was observed in HAP powder treated with SiF, even though more total fluorine in the form of FAP and CaF2 was observed in HAP powder samples treated with APF. Presumably as a consequence of this higher level of FAP formation after SiF treatment, the highest level of crystallinity along with the lowest solubility in acidic solution were observed in HAP powder treated with SiF solution. We concluded, therefore, that SiF may have potential value for use as a topical fluoride solution.
authors.affiliation: Department of Orthodontics, School of Dentistry, Tokushima University, Japan.
authors.forename: H
authors.initials: H
authors.lastname: Murata
authors.forename: K
authors.initials: K
authors.lastname: Ishikawa
authors.forename: S
authors.initials: S
authors.lastname: Tenshin
authors.forename: S
authors.initials: S
authors.lastname: Horiuchi
authors.forename: M
authors.initials: M
authors.lastname: Nakanishi
authors.forename: K
authors.initials: K
authors.lastname: Asaoka
authors.forename: T
authors.initials: T
authors.lastname: Kawata
authors.forename: T T
authors.initials: TT
authors.lastname: Yamamoto
mesh_terms: D000149:Acidulated Phosphate Fluoride / Q000737:chemistry; D001031:Apatites / Q000737:chemistry; D018360:Crystallography, X-Ray; D017886:Durapatite / Q000737:chemistry*; D005459:Fluorides / Q000737:chemistry*; D005460:Fluorides, Topical / Q000737:chemistry*; D000644:Quaternary Ammonium Compounds / Q000737:chemistry*; D012824:Silicic Acid / Q000737:chemistry*; D018030:Silver Compounds; D012969:Sodium Fluoride / Q000737:chemistry; D012995:Solubility; D017550:Spectroscopy, Fourier Transform Infrared
chemical_list: D001031:Apatites; D005460:Fluorides, Topical; D000644:Quaternary Ammonium Compounds; D018030:Silver Compounds; D012824:Silicic Acid; C004832:hexafluorosilicate; D000149:Acidulated Phosphate Fluoride; D012969:Sodium Fluoride; D017886:Durapatite; C024633:silver diamine fluoride; C025105:fluorapatite; D005459:Fluorides