Calcification of Teeth

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Abstract
Dentin and enamel of rat and human teeth were equilibrated with NaF at a pH of 7.1. In spite of the wide differences in composition that were encountered, both the dentin and enamel of the 2 8pp. gave apatite patterns before and after treatment with the fluoride solns. On ignition at 900[degree]C, specimens whose Ca: PO4 ratios were less than 1.5, namely, rat dentin and enamel, gave beta-tricalcium phosphate patterns. Specimens whose Ca: PO4 ratios were greater than 1.6, namely, human dentin and enamel; both human and rat dentin and enamel after NaF treatment, gave apatite patterns. The increase found in the Ca: PO4 ratios of dentins and enamels after NaF treatment (pH = 7.1) was due to preferential solubility of phosphate instead of carbonate. The changes which may explain why the rat enamel and dentin no longer gave beta-tricalcium phosphate on ignition after NaF treatment are schematically presented below: [image].

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