Figure 3.
Hydroxyapatite has the highest affinity for and is the least compatible with
sodium fluoride, whereas silica has the smallest heat of adsorption. The
heats of adsorption of sodium fluoride with the abrasive systems were
measured by first equilibrating the solids with a humectant-water solution
and then injecting a solution containing humectant, water, and 1500 ppm ionic
fluorine from sodium fluoride at pH 6.8.
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