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

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 hydroxyapatite to be 73 +/- 3, 18 +/- 2 and 18 +/- 1%, respectively.