Abstract
Measurements of the pH of saliva, conjunctival fluid and dental plaques in situ were made in hamsters receiving a caries-conducive diet, by the use of glass microelectrodes specific for hydrogen ions. The pH of conjunctival fluid ranged between 6.3 and 7.3. The pH values for saliva ranged between 6.3 and 9.0 depending on the exposure to air, and presumably the amount of CO 2 lost to the air. All dental plaques fermented sucrose but only in hamsters in which dental caries was developing as a result of infection with cariogenic streptococci did the plaques ferment sucrose rapidly and attain strongly acid values. Thus caries in hamsters, like caries in man, seems to be associated with acidogenic activity of microbial plaques.
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