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J Dent Res 17(3): 251-256, 1938
© 1938 International and American Associations for Dental Research
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HYDROGEN ION CONCENTRATION OF THE DENTAL PLAQUE

ROBERT M. STEPHAN D.D.S., M.S.1

1 Department of Physiological Chemistry and Metallurgy, College of Dentistry, University of Illinois, Chicago, Ill.

211 plaques were tested for their hydrogen-ion concentrations and were found to vary from pH 4.6 to pH 7.0. The average pH was 5.9 but the distribution was fairly even from pH 5.0 to pH 6.8.

Debris from 38 tooth cavities was tested for hydrogen-ion concentration and was found to vary from pH 4.2 to pH 6.2. The average was pH 5.2. This was .7 pH below that of the plaques.






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