A Study of Streptococci in the Plaque and Experimental Caries in Small Dogs Reared in the Room.

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The presence and some biochemical and serological characteristics of the S. mutans group, S. sanguis, and S. salivarius in the plaque of 68 small dogs indoors were examined. Supragingival plaque samples were cultured on TYC media and colonies which showed typical morphology of each streptococcal species were subcultured and partially characterized. The S. mutans group could be detected in 19 of 68 dogs, and 3 out of 19 isolates were S. cricentus, 10 out of 19 S. mutans (serotype c), 1 out of 19 S. mutans (serotype f), and 2 out of 19 S. sobrinus. However, 3 out of 19 isolates were not differentiated into any species. S. sanguis could be detected in 15, and S. salivariusin 11 of the 68 dogs. Three small dogs (mongrels) of 50 days of age were orally inoculated with S. mutans (serotype c) strains and fed a cariogenic diet, a modified Diet 2000, for 9 months. During this period two of the three dogs developed dental caries in their second molars.
有限責任中間法人日本口腔衛生学会の論文