Studies of the Microbiology of Caries

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Abstract
By means of an elec-trometric pH meter and an antimony electrode, the pH variations in dental plaques were detd. after rinsing the mouth with glucose soln. Correction was made with respect to the potential between the plaque and the saliva. There was a rapid decrease in pH in the first 10-15 min., a pH minimum was reached, and then there was a slow pH increase to the original value. Immediately afterwards, stimulated saliva was taken for detn. of the number of lactobacilli. A statistical analysis of the findings from 110 investigated persons showed that individuals with higher pH minimum of their plaque fermentation curves had fewer lactobacilli and those with lower pH minimum had more lactobacilli.