Journal of Dental Research, Vol 65, 387-389, Copyright © 1986 by International & American Associations for Dental Research Online Journals
Enamel fluoride retention after DCPD and APF application and prolonged exposure to fluoride in vitro
J. J. Crall and J. M. Bjerga
The effect of a topical fluoride regimen consisting of a four-minute
pre-treatment with a saturated dicalcium phosphate dihydrate (DCPD)
solution followed by a four-minute application of APF was compared with
that of a four-minute application of APF alone with respect to the
deposition of fluoride in enamel in an apatitic form in vitro. Following
the topical applications, specimens were washed in either (1) an inorganic
wash solution for 24 hrs or (2) an inorganic wash solution with 1 ppm F
added for 28 days; specimens were then subjected to KOH extraction for 24
hrs. Fluoride-by-depth profiles revealed that the DCPD/APF treatment
resulted in a significant increase in the apatitic F concentration of
enamel to a depth of 20 microns, while APF application alone did not. All
groups exposed to the 1 ppm F wash acquired significant amounts of apatitic
F, with the differences between groups remaining relatively constant.
