Abstract
The fixed charge of enamel and the ratio of the diffusion coefficients of cations to anions of some common electrolytes within enamel were calculated from steady state electromotive forces developed in concentration cells across enamel caps of whole human teeth, sections of human enamel or synthetic hydroxyapatite membranes. The electrolytes were KCl, KF, NaCl, CaCl 2, KH 2PO 4 and K 2HPO 4. The results indicate that enamel behaves like an ion exchange membrane of which the fixed charge depends on the electrolytic environment and the sequence of exposure to various electrolytes.
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