The chemical composition of teeth

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Abstract
Quantitative analyses of the inorganic constituents of the separated enamel and dentine of sound premolar teeth (children) showing different grades of hypoplasia were performed. The amts. of the elements and groups estimated (Ca, P, Mg, CO2, Na, K, Cl, F.) indicated that "good enamel" was 98% apatite. Hypoplastic enamel contained less apatite and by reason of its higher P content and more acidic nature seemed to contain some P compound less basic than tricalcium phosphate. All the dentines contained P in excess of that required to satisfy the Ca and Mg of apatite. As in the enamels the "good dentine" was the more basic dentine. Ca values taken alone are of no use in judging the quality of the enamel, they must be considered in relation to the Mg and P values.

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