Abstract

Dental fluorosis and osteofluorosis from using drinking water contaminated with the fluoride ion (F) have been reported from many countries including the People’s Republic of China and India. Because fluoride is excreted by the kidney and the toxic effects of F are more severe when renal failure is present, Imprinting control region (ICR)-derived glomerulonephritis (ICGN) mice, which have been used as a model of renal failure, could be a useful model for osteofluorosis. In the present study, ICGN mice and ICR mice were administered F at 0, 25, 50, 100, and 150 ppm in their drinking water for 4 weeks. The femurs of the mice were photographed and analyzed by microdensitometry. The teeth were stained with hematoxylin and eosin. While no significant differences in any bone indexes were found in the ICGN groups, the mean values for bone mineral content and bone mineral density of the left femur from the male ICR 150 ppm group were significantly higher than those of the control group mice (p<0.001). Partial heterogeneous calcification of the tooth dentine was observed in the ICGN mice exposed to 150 ppm. ICGN mice may be used as a model for dental fluorosis. However, ICR mice, particularly males, with an exposure period of 2–4 mo, may be a better animal model for osteofluorosis.

• Related Studies :

  • Fluoridation and bone disease in renal patients

    About the Authors: William J Johnson, director of the Mayo Artificial Kidney Center and professor of medicine with the Division of Nephrology at the Mayo Clinic, has been involved in the study of calcium and phosphorus metabolism and renal osteodystrophy, potassium metabolism, and uremic neuropathy. He is past chairman of the Minnesota

  • Medical aspects of excessive fluoride in a water supply

    A 10-year study of 116 persons in Bartlett and 121 in Cameron, Tex., was conducted to determine if prolonged exposure to fluoride in the water supply of Bartlett had produced detectable physiological effects. Bartlett's water contained about 8 p.p.m. F until 1952, when an experimental defluoridation unit was installed, reducing the

  • Renal failure and fluorosis

    Two patients had a combination of renal insufficiency and systemic fluorosis. One had bilateral vesicoureteral reflux and recurrent pyelonephritis, with resulting renal atrophy; the other had probable renal dysgenesis of indeterminate origin. Both patients had polydipsia, polyuria, and markedly reduced renal function. Both also had clinical and roentgenographic evidence of

  • Fluoride-related bone disease associated with habitual tea consumption

    Acquired osteosclerosis is a rare disorder of bone formation but an important consideration in adults with sclerotic bones or elevated bone density results. In such patients, malignancy, hepatitis C, and fluorosis should all be considered when making a diagnosis. We describe 4 patients evaluated at our Metabolic Bone Disease Clinic

  • Skeletal fluorosis from eating soil

    A woman with chronic pyelonephritis developed progressive muscular weakness and bone pain. For twenty years she had habitually ingested fluoride-rich soil. Osteosclerosis was found on x-ray examination, and fluorosis was confirmed by bone biopsy. Renal failure augmented skeletal retention of excessive fluoride intake which, in turn, appears to have intensified symptomatic renal

• Related FAN Content :

  • Similarities between Skeletal Fluorosis and Renal Osteodystrophy

    It is quite possible, and indeed likely, that some kidney patients diagnosed with renal osteodystrophy are either suffering from skeletal fluorosis or their condition is being complicated/exacerbated by fluoride exposure.

  • Skeletal Fluorosis: The Misdiagnosis Problem

    It is a virtual certainty that there are individuals in the general population unknowingly suffering from some form of skeletal fluorosis as a result of a doctor's failure to consider fluoride as a cause of their symptoms. Proof that this is the case can be found in the following case reports of skeletal fluorosis written by doctors in the U.S. and other western countries. As can be seen, a consistent feature of these reports is that fluorosis patients--even those with crippling skeletal fluorosis--are misdiagnosed for years by multiple teams of doctors who routinely fail to consider fluoride as a possible cause of their disease.

  • Skeletal Fluorosis in the U.S.

    Although there has been a notable absence of systematic studies on skeletal fluorosis in the U.S., the available evidence indicates that the consumption of artificially fluoridated water is likely to cause skeletal fluorosis and other forms of bone disease in people with kidney disease and other vulnerable populations.

  • Fluoride & Osteomalacia

    One of fluoride's most well-defined effects on bone tissue is it's ability to increase the osteoid content of bone. Osteoid is unmineralized bone tissue. When bones have too much of it, they become soft and prone to fracture -- a condition known as osteomalacia. As shown below, fluoride has repeatedly been

  • Exposure Pathways Linked to Skeletal Fluorosis

    Excessive fluoride exposure from any source -- and from all sources combined -- can cause skeletal fluorosis. Some exposure pathways , however, have been specifically identified as placing individuals at risk of skeletal fluorosis. These exposure pathways include: Fluoridated Water for Kidney Patients Excessive Tea Consumption High-Fluoride Well Water Industrial Fluoride Exposure Fluorinated Pharmaceuticals (Voriconazole