Abstract
Extra fluoride was added to the diet of two 12-week-old pigs at a dosage of 0.5 mg F/kg body wt/day for 6 weeks only. Analyses of teeth in a control and F-fed pig, 18 weeks old, showed that F readily became incorporated into the whole thickness of immature enamel (mean density 2.10) but no accumulation took place in surface enamel. During the following 30 weeks on the control diet, the F concentration in enamel fell; the decrease was slightly greater in the teeth of F-fed pig than in those of the control pig. Thus F in mature enamel is not a good indicator of that present in the early stages of maturation. As mineralization progressed, F was deposited and concentrated in surface enamel; this accumulation reflected the increased dietary F intake some 30–36 weeks earlier. Further evidence was obtained for a F-concentrating mechanism in supracoronal tissue.
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