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1 Walter G. Zoller Memorial Dental Clinic, The University of Chicago, Chicago, Ill.
In this study of 65 individuals, it was found that there was an increase in the acidity of bacterial material on the teeth in every case after the mouth was rinsed with a glucose solution. However, the extent and duration of this increase in acidity (drop in pH) varied with the degree of caries-activity, being greatest in cases with extensive caries-activity. An acidity below pH 5.0 occurred only in cases with some caries-activity, and the occurrence of these low pH values was most frequent in cases of greatest caries-activity. The pH drop was more marked on the labial surfaces of the upper teeth than on the labial surfaces of the lower teeth, and this difference corresponded with the relative susceptibility to caries of these tooth surfaces. The significance of these findings to the etiology of caries is discussed.
Submitted on May 11, 1944
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