Letter
Since it has been established that the dental disease in man known as “mottled enamel” is due to the drinking of water containing fluorine, the removal of fluorides by filtration has become an important problem.
I have found that a contact filter 15 cm high, made of river sand passing a screen 60 to the inch, to which has been added 2 per cent. by weight of powdered aluminium, will remove the fluoride from a solution containing 30 parts per million of sodium fluoride. The absence of fluoride in the filtrate was determined by the zirconium-alizarin colorimetic method.
S.P. Kramer
Ft. Thomas, KY.
*Read letter online at https://science.sciencemag.org/content/80/2086/593.1
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[The safe threshold vallues of fluorine content in supply water by regressive analysis].
This paper deal in the regressive analysis on the basis of fluorine content of supply water and morbidity of enamel fluorosis. The morbidity sharp increased with increase of the fluorine content in the range of 0.4-1.0 mg/l. Furthermore, the relationship between the prevalence rate of skeletal fluorosis and the [fluorine]
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Dental fluorosis in Grand Rapids during the seventeenth year of fluoridation
At all ages 7.1 per cent of white children with continuous residence, and 15.9 per cent of Negro children with the same history, showed one of the positive signs of fluorosis--very mild or mild in degree. About the same proportions--7.7 and 14.1 percent, respectively--were found in children aged 12 to
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Prevalence of dental fluorosis in Mexico 2005-2015: a literature review.
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Association between developmental defects of enamel and dental caries in schoolchildren
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Endemic Fluorosis. (An Epidemiológical, Biochemical and Clinical Study in the Bhatinda District of Punjab).
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