Abstract
Sound and artificially decalcified enamel has been studied by dynamic and static thermal analysis. Weight losses mainly due to water release occur in 3 temperature ranges: 20–150, 150–400 and 400–550 °C. Special attention has been given to water release occurring in the range 150–400 °C. Here the weight losses for sound and carious enamel are 1.9 ± 0.3 and 4.5 ± 0.9%, respectively. Possible models for HPO<sub>4</sub><sup>2</sup><sup>––</sup> and H<sub>2</sub>O incorporation are discussed. The experimental thermal analysis studies, combined with infrared and X-ray data indicate that the mineral phase in sound enamel and carious enamel can be approximated by the formulae of water-containing non-stoichiometric apatites. In the temperature range 150–400 °C, the (firmly bound) H<sub>2</sub>O content in sound and carious enamel is comparable. The significant difference in weight loss between sound and carious enamel is caused by the differences in HPO<sub>4</sub><sup>2––</sup> content.
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