Abstract
The initiation and development of carious lesions in cotton rats was influenced by the type of cage and bedding in which they were housed during the exptl. period. Cotton rats maintained in cages with screen floors had a significantly higher avg. number and a significantly higher avg. extent of carious lesions than littermates maintained throughout the expt. in cages with sheet metal floors covered with coarse wood shavings. Cotton rats which were housed in cages with sheet metal floors covered with paper clippings did not have an appreciably different dental caries experience from their littermates in cages with screen floors.

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