Abstract
Representative strains of Streptoccocus mutans, Streptococcus milleri, Streptococcus sanguis. Streptococcus mitis, Streptococcus salivarius and Streptococcus faecium were tested in vitro for their ability to form an adherent mass resembling plaque on nichrome steel wires. The potential of these streptococci for forming plaque in vitro was then compared to their cariogenicity in a known reproducible gnotobiotic rat system. The consistency and morphology of the plaque varies considerably between strains. However, no clear relationship was found between cariogenicity and the four plaque parameters of grade, weight, total extra-cellular polysaccharide and number of colony-forming units.
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