The effect of contact time of acidulated phosphate fluoride on fluoride concentration in human enamel.
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.
D000149:Acidulated Phosphate Fluoride / Q000378:metabolism*; D001031:Apatites / Q000378:metabolism; D002124:Calcium Fluoride / Q000378:metabolism; D003743:Dental Enamel / Q000378:metabolism*; D005459:Fluorides / Q000378:metabolism*; D006801:Humans; D006882:Hydroxyapatites / Q000378:metabolism; D066298:In Vitro Techniques; D013997:Time Factors
D001031:Apatites; D006882:Hydroxyapatites; D000149:Acidulated Phosphate Fluoride; C028869:fluor-hydroxylapatite; C025105:fluorapatite; D002124:Calcium Fluoride; D005459:Fluorides