Concentration of hydroxyl groups in dental apatites: a solid-state MAS NMR study using inverse ~(31)P→ ~1H cross-polarization

摘要

The concentration of structural hydroxyl groups in the apatite mineral of enamel, dentin and cementum of healthy human teeth was estimated by reference to stoichiometric hydroxy-apatite to be 73 ± 3, 18 ± 2 and 18 ± 1%, respectively. Mineral of bone and hard dental tissues is composed of apatites, compounds with a crystal structure similar to that of calcium hydroxyapatite (HA)~1 Ca_(10)(OH)_2(PO_4)_6. In enamel, dentin and cementum, the apatite mineral is accompanied by an organic matrix and water (Table 1). The differences in the chemical composition of the hard dental tissues reflect their functions and tailor their biological and mechanical properties.