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Serum fluoride concentrations and urinary excretion of fluoride in patients hospitalized in a low fluoride community



Serum fluoride concentrations and urinary excretion of fluoride in patients hospitalized in a low fluoride community



Proceedings of the Finnish Dental Society 78(1): 5-12



Two earlier studies indicate that fluoride excretion in urine is age dependent. Middle-aged persons seem to excrete more fluoride than either young or old people. Both previous studies are based on the mean daily urinary excretion of fluoride in persons grouped according to the decade of their age. The finding is thus not necessarily significant if the results are analyzed using regression analysis and, in particular, correlation analysis. The previous findings were tested by collecting data on patients hospitalized in a low-fluoride community. Any deviation in results caused by the place of residence of the patients, which was not taken into account in the previous study, was also measured. The urinary excretion of fluoride was distinctly higher in the middle-aged patients than in either the young or the old ones. The reason for the increase in daily fluoride excretion from young to middle age is obviously the decreasing role of the skeleton in the absorption of fluoride. The explanation for the decrease in fluoride excretion beginning in old age could be renal or dietary, with the latter much more likely. In old age, water consumption obviously decreases as physical activity slows down, thus causing a decline in fluoride excretion. Middle-aged male patients excreted distinctly more fluoride than middle-aged females. In old age this difference disappeared. The difference in body weight between the sexes cannot alone account for this finding. Men traditionally perform the most physically strenuous work in this society. This means that they expend more energy and therefore consume more food and drink than women, especially during their active years. In old age, the quantities of nutrients consumed by men are no longer so different from those consumed by women. This explanation is also in good agreement with some previous fluoride results obtained in bone and plamsa. The mean serum and urinary fluoride levels were slightly but significantly higher in the nonresidents than in the residents of the low-fluoride community. Thus, if all the participants of the previous study were city residents, the results would be slightly lower than earlier detected.

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Accession: 006401215

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PMID: 7100168



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