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Related Experiment Videos

Water on apatites.

D N Misra

    Calcified Tissue International
    |June 1, 1986
    PubMed
    Summary

    Water adsorption on calcium phosphates like enamel and bone mineral was studied. Adsorbed water amount correlates with surface area, suggesting pore structure influences uptake, even in deproteinized samples.

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    Area of Science:

    • Biomaterials Science
    • Surface Chemistry
    • Dental Materials

    Background:

    • Apatitic calcium phosphates, including enamel and bone mineral, are crucial biomaterials.
    • Understanding their interaction with water is vital for material stability and biological function.
    • Previous studies have explored water adsorption on these materials with varying results.

    Purpose of the Study:

    • To investigate the gravimetric adsorption of water on various apatitic calcium phosphates.
    • To determine the relationship between water uptake, surface area, and calcium to phosphorus ratio.
    • To explore factors influencing higher water adsorption in biological apatites.

    Main Methods:

    • Gravimetric analysis of water adsorption at 23°C in an open system.
    • Experiments conducted across a range of relative humidities.
    • Utilized synthetic apatites, natural enamel, deproteinized enamel, and bone mineral.

    Main Results:

    • Water adsorption increased linearly with the surface area of synthetic apatites.
    • Water uptake showed low sensitivity to the calcium to phosphorus ratio.
    • Adsorption data correlated well with conventional isotherms up to two monolayers.
    • Higher water uptake in deproteinized enamel and bone mineral suggests contributions from pore structure and residual organic matter.

    Conclusions:

    • Surface area is a primary determinant of water adsorption in apatitic calcium phosphates.
    • Pore structure and incomplete organic matter removal significantly impact water adsorption in biological apatites.
    • These findings have implications for understanding the behavior of dental and bone materials in physiological environments.

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