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      Prevention of bony fluorosis in aluminum smelter workers. A 15-year retrospective study of fluoride excretion and bony radiopacity among aluminum smelter workers -- Pt. 4.

      Journal of occupational medicine. : official publication of the Industrial Medical Association
      Adult, Aluminum, Bone Diseases, chemically induced, radiography, Environmental Exposure, Fluoride Poisoning, Fluorides, urine, Humans, Metallurgy, Middle Aged, Occupational Diseases, Retrospective Studies, Time Factors

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          Abstract

          1. Fifty six aluminum smelter workers with 10 to 43 years' occupational exposure, and who had been previously studied medically, were re-x-rayed. Average urinary fluoride concentrations since 1960 were estimated to range from 2.78 mg/liter preshift and 7.71 mg/liter postshift. 2. Roentgenographic studies in 1960-66 and 1974 failed to reveal any evidence of fluoride associated bony change. 3. Although these workers represent a self-selected group, their magnitude and duration of exposure far outweighs any other group working at present or in the past at this plant. The implication that they have uniformly self-selected as fluoride resistant individuals is improbable. 4. These data indicate that group post-shift ur a long period is not associated with enhanced risk of bony fluorosis. If preshift urinary fluoride concentrations are less than 4 mg/l, the same results appears to apply.

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