Abstract
The membrane potentials across the enamel caps of six sound human teeth at 25 °C with 0.1M and 0.01 KCl solutions on the inner and outer enamel surfaces respectively were measured with a high-impedance potentiometric pen-recorder using calomel half-cells. The effect of five organic potassium salts applied separately to the outer enamel surfaces for a fixed period of 30 min and at 0.1M concentration was studied. In general, on replacing a test solution with 0.01M KCl the potential was initially depressed and then rose above its original value. The order in which the salts elevated the potential was approximately the same for all teeth. Relating these results to the effects produced by six inorganic salts previously investigated gave the following order for the magnitude of the rise in the potential: Citrate > tartrate > fluoride > oxalate > sulphate > lactate > acetate > dihydrogen phosphate > ▪
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