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Journal of Nutrition Vol. 71 No. 2 June 1960, pp. 109-114
Copyright © 1960 by American Society for Nutrition
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Studies of the Effects of Dietary NaF on Dairy Cows

IV. Dental Changes as the Result of Long-term Fluorine Ingestion1

J. W. Suttie and P. H. Phillips

Department of Biochemistry, University of Wisconsin, Madison

The distribution of fluorine in the enamel and dentin of cows exposed to elevated dietary fluorine levels from 2 and 5 years of age through 8 years has been studied. Dentin from control cows of this age contained less than 1000 and enamel less than 500 ppm of fluorine.

The level of fluorine in the dentin, much like bone, increased with added increments of dietary fluorine and with duration of exposure. The amount of fluorine in the dentin increased from the first to the 4th incisor, indicating a more rapid accumulation in younger osseous structures.

Increasing the dietary level of fluorine resulted in increased enamel fluorine only if the teeth had not erupted prior to exposure.

Dentin having an increased fluorine concentration was shown to also have a decreased solubility in acid.

Incisors which were in the formative stage during the fluoridation period developed typical signs of dental fluorosis. However, dental fluorosis, which usually precedes other systemic symptoms of fluorine toxicity, is quite variable and should not in itself be used as a definitive index of fluorine toxicosis.

1 Published with the approval of the Director of the Wisconsin Agricultural Experiment Station. Supported in part by a grant from the Aluminum Company of America, Pittsburgh, on behalf of itself and the Aluminum Laboratories Ltd., the American Cyanamid Co., the American Smelting and Refining Co., the Kaiser Aluminum and Chemical Corporation, the Monsanto Chemical Co., the Reynolds Metal Co., the Tennessee Valley Authority, the U. S. Steel Corporation of Delaware, and Westvaco, Chemical Division of Food Machinery and Chemical Corp., and Ormet Corporation.

We wish to acknowledge the services of Dr. Thaddeus Kowalczyk D.V.M. for handling the health problems throughout these studies.

Manuscript received 30 January 1960.




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