Abstract
Similar types of bacteria, selected on the basis of their distinctive colony morphology on mitis-salivarius agar and trypticase soy agar plates, were recoverable from the plaque of weanling littermate rats. The proportional distribution of these bacteria was highly variable within a litter, irrespective of whether a pellet diet or a powdered non-cariogenic diet was fed before weaning, or whether plaque was sampled from the central and distal fissures and the approximal surfaces of lower first and second molars or from only the central fissures of these teeth. Corresponding observations were made in rats fed a cariogenic diet after weaning. In this case, the caries experience of littermates appeared to be less variable than the proportional distribution of bacteria from plaque in the central fissure of their lower first and second molars. The results preclude the extrapolation from one rat to its littermates of quantitative bacteriological data relating to plaque.
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