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Related Experiment Videos

Promotion of bone dissolution by excessive fluoride in acidic buffer solution.

M Okazaki, R H Ophaug, L Singer

    Biomaterials
    |July 1, 1985
    PubMed
    Summary

    This study shows that fluoride uptake by bone increases mineral crystallinity. High fluoride levels can unexpectedly enhance bone apatite dissolution, forming calcium fluoride (CaF2).

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    Area of Science:

    • Biomineralization
    • Skeletal Biology
    • Materials Science

    Background:

    • Bone is a dynamic tissue composed of hydroxyapatite mineral and collagen.
    • Fluoride is known to affect bone metabolism and properties.
    • Understanding fluoride's interaction with bone mineral is crucial for skeletal health research.

    Purpose of the Study:

    • To quantitatively assess fluoride uptake by bone.
    • To investigate the impact of fluoride on bone's chemical and physical properties.
    • To elucidate the mechanisms of fluoride interaction with bone mineral.

    Main Methods:

    • Rat bone samples were incubated in acidic buffer solutions (pH 5) with varying fluoride concentrations (0-1000 ppm F).
    • Bone mineral properties were analyzed after 1 week of incubation.
    • Solution chemistry (calcium, phosphate, fluoride concentrations) and X-ray diffraction were employed.

    Main Results:

    • Fluoride uptake significantly increased bone mineral crystallinity with higher fluoride concentrations.
    • Calcium levels in incubation solutions decreased as fluoride levels increased, indicating calcium binding.
    • Phosphate levels initially decreased then increased above 200-300 ppm fluoride, suggesting CaF2 formation and potential apatite dissolution.

    Conclusions:

    • Fluoride incorporation into bone mineral enhances its crystallinity.
    • The formation of calcium fluoride (CaF2) was confirmed by solution chemistry and X-ray diffraction.
    • Excessive fluoride in acidic conditions may paradoxically promote dissolution of bone apatites, despite fluoride's general anti-resorptive effects.

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