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Heterogeneous Mg-containing hydroxyapatites

M Okazaki1, J Takahashi

  • 1Department of Dental Technology, Osaka University, Japan.

The Journal of Osaka University Dental School
|December 1, 1994
PubMed
Summary
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Synthesizing magnesium-containing hydroxyapatites with different addition orders resulted in distinct crystal structures and solubilities. This suggests the formation of heterogeneous materials, impacting their properties.

Area of Science:

  • Materials Science
  • Biomaterials Chemistry
  • Crystallography

Background:

  • Hydroxyapatite is a key biomaterial, and magnesium incorporation can modify its properties.
  • Controlling the synthesis of magnesium-containing hydroxyapatite is crucial for tailored applications.

Purpose of the Study:

  • To investigate the effect of magnesium addition sequence on hydroxyapatite synthesis.
  • To characterize the structural, compositional, and morphological differences between synthesized materials.
  • To evaluate the solubility of the resulting magnesium-containing hydroxyapatites.

Main Methods:

  • Synthesis of two magnesium-containing hydroxyapatites (H-MgAp and Mg-HAp) with reversed magnesium addition orders.
  • X-ray diffraction (XRD) analysis to determine crystal structure.

Related Experiment Videos

  • Chemical composition analysis to quantify magnesium content.
  • Microscopy to observe crystal morphology.
  • Solubility experiments.

    • Main Results:

    • Both H-MgAp and Mg-HAp showed slight differences in XRD patterns with a shift in (002) reflection.
    • Chemical compositions were similar, with magnesium content half that of homogeneous MgHAp.
    • Crystal shapes differed significantly: H-MgAp was plate-like, while Mg-HAp was needle-like.
    • Mg-HAp exhibited higher solubility compared to H-MgAp.

    Conclusions:

    • The order of magnesium addition during synthesis influences the formation of heterogeneous magnesium-containing hydroxyapatites.
    • Distinct crystal morphologies and solubilities arise from different addition sequences.
    • These findings suggest potential for creating tailored magnesium-hydroxyapatite biomaterials.