Formation of Ca HPO4-2H2O from enamel mineral and its relationship to caries mechanism.
Tooth enamel, when treated with dilute H3P94 solutions, dissolved incongruently with formation of large CaHPO4-2HO2O crystals. Equilibrated solutions were saturated with respect to Ca5(PO4)3OH, probably an impure, defective apatite. The CaHPO4-2H2O crystals formed at considerably higher pH values than expected becuase of enhanced solubility of the apatitic phase in enamel. Pyolysis of carious enamel revealed the presence of acidic calcium phosphate presumed to be CaHPO4-2H2O.
D002118:Calcium / Q000032:analysis; D002130:Calcium Phosphates / Q000378:metabolism*; D003731:Dental Caries / Q000378:metabolism*; D003743:Dental Enamel / Q000378:metabolism*; D006358:Hot Temperature; D006801:Humans; D006863:Hydrogen-Ion Concentration; D006882:Hydroxyapatites / Q000378:metabolism*; D010710:Phosphates / Q000378:metabolism; D010756:Phosphoric Acids / Q000378:metabolism; D010758:Phosphorus / Q000032:analysis; D013053:Spectrophotometry; D013054:Spectrophotometry, Atomic
D002130:Calcium Phosphates; D006882:Hydroxyapatites; D010710:Phosphates; D010756:Phosphoric Acids; D010758:Phosphorus; D002118:Calcium