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1 Walter G. Zoller Memorial Dental Clinic, University of Chicago, Chicago, Ill.
1. Typical macroscopic characteristics of true caries of human enamel appear to have been duplicated in vitro by the action of a number of acid solutions containing calcium and phosphate ions in less than maximal concentration.
2. The same acid solutions with low concentrations of calcium and phosphate ions produced on enamel surfaces changes which do not resemble natural caries.
3. The same acid solutions with maximal calcium and phosphate ion concentration (in some cases at pH 3.58) appear to produce no effect on enamel in vitro.
Submitted on December 18, 1952
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