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  • Title: The effect of contact time of acidulated phosphate fluoride on fluoride concentration in human enamel.
    Author: Benediktsson S, Retief DH, Bradley EL, Switzer P.
    Journal: Arch Oral Biol; 1982; 27(7):567-72. PubMed ID: 6957171.
    Abstract:
    Polished enamel blocks with known surface areas were obtained from human mandibular incisors. Acidulated phosphate fluoride was applied for 4 min and washed off after additional contact times of 0, 2, 6 and 24 h, respectively. The enamel fluoride concentrations were determined in three successive etch depths before and after extraction in 1 M KOH for 24 h. The predominant reaction product was CaF2. The concentration of the fluoride bound as fluorapatite or fluorhydroxyapatite reached an optimal level after a 6-h contact time.
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