The intermediate formation of CaHPO 4 · 2H 2 O and its subsequent conversion to Ca 5 (PO 4 ) 3 F or CaF 2 may be a major factor in increased fluoride uptake when tooth enamel is pretreated with acid solutions before being exposed to fluoride. To obtain information concerning the form of fluoride incorporation, the reactions of CaHPO 4 ·2H 2 O with solutions containing various amounts of F-and PO 4 3- ions were studied.
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Chow et al. (1973) studied this question.
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