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J Dent Res 35(3): 332-343, 1956
© 1956 International and American Associations for Dental Research
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EVALUATION OF LABORATORY TESTS FOR THE ESTIMATION OF CARIES ACTIVITY

MARSHALL L. SNYDER 1, THEODORE SUHER 1, DONALD R. PORTER 1, CECIL K. CLAYCOMB 1, and MARGERY K. GARDNER 1

1 Departments of Bacteriology, Pedodontia and Biochemistry, Dental School, University of Oregon, Portland, Ore.

Lactobacillus counts made on tomato-juice peptone agar (pH 5.0) containing sodium azide as a selective inhibitor were comparable with respective counts on Rogosa's SL agar if the azide was present in a 1:20,000 concentration. No essential difference was observed between the rate of color or acid formation in either Snyder test agar or Rogosa's SLA (mod.) medium compared with the lactobacillus counts of respective specimens of saliva.

Submitted on December 8, 1954
Revised on December 6, 1955






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