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Uptake of KOH‐soluble and KOH‐insoluble fluoride in sound human enamel after topical application of a fluoride varnish (Duraphat) or a neutral 2% NaF solution in vitro
Author(s) -
Cruz Roberval,
Ögaard Björn,
Rölla Gunnar
Publication year - 1992
Publication title -
european journal of oral sciences
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.802
H-Index - 93
eISSN - 1600-0722
pISSN - 0909-8836
DOI - 10.1111/j.1600-0722.1992.tb01732.x
Subject(s) - fluoride varnish , varnish , fluoride , enamel paint , chemistry , in vitro , dentistry , nuclear chemistry , pharmacology , inorganic chemistry , medicine , biochemistry , organic chemistry , coating
The uptake of alkali‐soluble fluoride (calcium fluoride‐like material and adsorbed fluoride) and alkali‐insoluble fluoride (apatitically bound fluoride) on sound human enamel from treatment with Duraphat or a neutral 2% NaF solution was investigated in vitro. Blocks from impacted third molars were used. More fluoride was deposited on the enamel from the neutral 2% NaF solution than from the Duraphat treatment. All the fluoride could be dissolved in alkali. Globules of calcium fluoride‐like material were demonstrated by scanning electron microscopy. Chemical analysis showed no measurable increase in the apatitically bound fluoride (alkali‐insoluble fluoride) after brief exposures. Duraphat‐treated samples submerged in water after the exposure lost only about 50% of the deposited fluoride, whereas samples treated with 2% NaF are known to lose all their fluoride under similar circumstances, a condition which may be related to the favorable clinical effect of Duraphat.