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Dental Caries in the Cotton Rat

VI. The Effect of the Amount of Protein, Fat and Carbohydrate in the Diet on the Incidence and Extent of Carious Lesions¹

Department of Biochemistry, College of Agriculture, University of Wisconsin, Madison

1. The isocaloric substitution of 10 or 20 parts of lard for sucrose in a purified ration reduced the incidence and extent of carious lesions in the cotton rat in proportion to the amount of lard added.

2. When the casein content of the diet was increased from 24 to 50% at the expense of sucrose, some reduction in caries occurrence was observed.

3. When 50 parts of casein and 10 parts of lard were fed, the protective effect was additive. The number of cavities observed was comparable to that observed when the ration contained 20 parts of lard.

4. No carious lesions were noted when mineralized whole milk diets were fed. The incidence and extent of tooth decay were low when a ration approximating milk solids in composition was fed.

We are indebted to Abbott Laboratories, North Chicago, Illinois, for halibut liver oil; to Merck and Company, Rahway, New Jersey, for the crystalline B vitamins; and to Wilson Laboratories, Inc., Chicago, Illinois, for the 1:20 liver extract.

² Now at Harvard School of Dental Medicine.

Manuscript received 15 October 1945.

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