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Iron uptake by teeth and bones: a Mossbauer effect study.

E Bauminger, S Ofer, I Gedalia

    Calcified Tissue International
    |July 1, 1985
    PubMed
    Summary
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    This study investigated iron uptake in bones and teeth. Dental enamel permanently absorbs small iron amounts, with bone and teeth retaining iron primarily as Fe3+.

    Area of Science:

    • Biomineralization
    • Materials Science
    • Analytical Chemistry

    Background:

    • Iron is essential for biological processes, but its interaction with hard tissues like bone and teeth is not fully understood.
    • Understanding iron's behavior in dental enamel and bone is crucial for developing targeted therapies and diagnostics.

    Purpose of the Study:

    • To investigate the in vivo and in vitro iron uptake mechanisms in bones, teeth, and dental enamel.
    • To determine the valence state and chemical form of iron within these tissues.
    • To compare the iron exchange rates between bones and teeth.

    Main Methods:

    • Chemical analysis
    • Powder X-ray diffraction
    • Mössbauer spectroscopy
    • Atomic absorption spectroscopy

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    Main Results:

    • Dental enamel demonstrated permanent uptake of small iron amounts (Fe2+) when exposed to iron solutions in vitro.
    • Mössbauer spectroscopy confirmed that iron retained its original valence state upon binding to dental enamel.
    • In vivo studies revealed iron in bones and teeth predominantly as Fe3+ (similar to FeOOH), with teeth containing approximately 10% Fe2+.
    • Iron was released or exchanged from teeth at a significantly slower rate compared to bones.

    Conclusions:

    • Dental enamel exhibits a capacity for iron sequestration, retaining its valence state.
    • Bone and tooth tissues incorporate iron primarily in the Fe3+ oxidation state.
    • Differential iron exchange rates exist between bone and tooth tissues, suggesting distinct physiological roles.