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J Dent Res 54(3): 475-481, 1975
© 1975 International and American Associations for Dental Research
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Formation of CaHPO4 · 2H2O from Enamel Mineral and Its Relationship to Caries Mechanism

W. E. BROWN 1, P. R. PATEL 1, and L. C. CHOW 1

1 American Dental Association Health Foundation Research Unit, National Bureau of Standards, Washington, DC 20234, USA

Tooth enamel, when treated with dilute H3PO4 solutions, dissolved incongruently with formation of large CaHPO4 · 2HO2O crystals. Equilibrated solutions were saturated with respect to CaHPO4 · 2H2O, and a mineral more soluble than well-crystallized, synthetic Ca5(PO4)3OH, probably an impure, defective apatite. The CaHPO4 · 2H2O crystals formed at considerably higher pH values than expected because of enhanced solubility of the apatitic phase in enamel. Pyrolysis of carious enamel revealed the presence of acidic calcium phosphate presumed to be CaHPO4 · 2H2O.

Submitted on June 10, 1974
Accepted on October 16, 1974






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