The role of ‘CaF₂-like’ material in topical fluoridation of enamel in situ

Abstract

In this paper the role and importance of 'CaF2-like' material deposited on enamel (Fon) by means of an APF gel and the varnishes Duraphat and Fluor Protector are described and discussed. The amount of Fon, determined by KOH extraction, is a measure of the amount of CaF2-like material on the enamel surface. Fluoride in the enamel (Fin), determined by etching, is the amount of F- bound in the solid enamel. Fon and Fin data are presented after various F- treatments and after wearing enamel slabs in dentures for a period of 1 week. The results of this work show that if we compare the three fluoridating agents, APF gel, Duraphat varnish, and Fluor Protector varnish in situ, only Fluor Protector shows a measurable amount of Fon after 1 week. The amounts of Fon acquired by the enamel surface (one application) rank as APF gel approximately Duraphat much less than Fluor Protector. Most likely, Fon in situ leaches away through the pellicle, with an apparent diffusion coefficient of about 10(-6) cm2.sec-1. The Fin data show that after APF gel or Duraphat treatment a substantial amount of Fin leaches away during 1 week in situ; the Fin values of Fluor Protector do not change. The efficiency of the fluoridating agents is most likely determined by the application period and fluoride availability. For APF gel, Duraphat, and Fluor Protector about 5%, 1%, and 44% of the available fluoride participates in the fluoridation process. CaF2-like globules are known to precipitate after gel or varnish treatment on the enamel surfaces and can be dissolved in KOH solution.(ABSTRACT TRUNCATED AT 250 WORDS)

In situ Fluoride Retention in Enamel and Dentine after the Use of an Amine Fluoride Dentifrice and Amine Fluoride/Sodium Fluoride Mouthrinse

“…CaF 2 can be found weeks [Øgaard et al, 1983] and months after a single fluoride application [Dijkman et al, 1983;Dijkman and Arends, 1988]. At pH 6 and below CaF 2 dissolves and releases fluoride which could induce reprecipitation of fluoride-containing hydroxyapatite.…”

In vitro Fluoride Uptake by Enamel from Different Amine Fluoride Concentrations

“…The amounts of F and the surface areas of the slabs were used to calculate the structurally bound fluoride (Ìg/cm 2 ) in the enamel removed. The etch depth was calculated assuming average enamel calcium content of 37.4 wt% and an average enamel density of 2.95 g/cm 3 as previously described [Dijkman et al, 1982a;Dijkman and Arends, 1988].…”

The Effect of Salivary Calcium and Fluoride Toothpaste on the Formation of KOH-Soluble Fluoride: In Vitro Study

“…Fluor je analiziran fluoridnom elektrodom (Orion 96 -09, Boston, MA., SAD). Količina alkalno topljivog fluorida izračunata je kao što su opisali Dijkman i Arends (13).…”

“…Fluoride was analyzed using a fluoride electrode (Orion 96-09, Boston, Mass., USA). The amount of KOH-soluble fluoride was calculated as described by Dijkman and Arends (13).…”