Enamel of human and bovine teeth was found to show sorption of free calcium ions after damage caused by short-term exposure to diluted hydrochloric acid or mechanical damage. The experiment was carried out using radioisotopes 32P and 45Ca and it was shown that majority of incorporated ions remained in the enamel after prolonged washing out with water as well as after brushing with toothpaste. A considerable stability of binding of the incorporated phosphate ions was noted in the damaged enamel after exposure to calcium salt solution, and marked stability of binding of the incorporated calcium ions after exposure to phosphate solution.
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