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Related Experiment Videos

Biodegradable magnesium-hydroxyapatite metal matrix composites.

Frank Witte1, Frank Feyerabend, Petra Maier

  • 1Laboratory for Biomechanics and Biomaterials, Department of Orthopedic Surgery, Hannover Medical School, Anna-von-Borries-Str. 1-7, 30625 Hannover, Germany. f.witte@web.de

Biomaterials
|February 6, 2007
PubMed
Summary

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Biodegradable magnesium alloy composites with hydroxyapatite (HA) reinforcements offer adjustable mechanical and corrosion properties. These metal matrix composites (MMCs) demonstrate cytocompatibility, making them promising biomaterials for various applications.

Area of Science:

  • Biomaterials Science
  • Materials Engineering
  • Corrosion Science

Background:

  • High demand exists for magnesium alloys with tunable corrosion rates and mechanical properties.
  • Metal matrix composites (MMCs) offer a potential solution for designing advanced magnesium alloys.

Purpose of the Study:

  • To investigate the mechanical, corrosive, and cytocompatible properties of a magnesium alloy AZ91D-hydroxyapatite (HA) metal matrix composite (MMC-HA).
  • To assess the influence of HA particle size and distribution on MMC-HA properties.
  • To evaluate the in vitro performance of MMC-HA in simulated physiological and seawater environments.

Main Methods:

  • Fabrication of MMC-HA using AZ91D magnesium alloy and hydroxyapatite (HA) particles.
  • In vitro testing of mechanical properties, corrosion behavior in artificial seawater and cell solutions.

Related Experiment Videos

  • Phase identification using techniques like X-ray diffraction.
  • In vitro cytocompatibility assessment through co-cultivation with human bone-derived cells (HBDC), MG-63 osteoblasts, and RAW264.7 macrophages.

    • Main Results:

    • Mechanical properties of MMC-HA were adjustable based on HA particle size and distribution.
    • HA particles stabilized corrosion rates and promoted uniform corrosion in artificial seawater and cell solutions.
    • Phase analysis confirmed the presence of Mg, Mg(17)Al(12), and HA, with CaCO3 forming on surfaces in artificial seawater but not in cell solutions.
    • MMC-HA supported adhesion, proliferation, and survival of HBDC, MG-63, and RAW264.7 cells.

    Conclusions:

    • Biodegradable MMC-HA exhibit tunable mechanical and corrosive properties.
    • MMC-HA demonstrate excellent cytocompatibility with various human cell lines.
    • These findings highlight MMC-HA as promising biodegradable biomaterials with adjustable characteristics.