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Related Experiment Videos

New bioactive, degradable composite microspheres as tissue engineering substrates.

Q Q Qiu1, P Ducheyne, P S Ayyaswamy

  • 1Department of Bioengineering, Center for Bioactive Materials and Tissue Engineering, University of Pennsylvania, Philadelphia, PA 19104, USA.

Journal of Biomedical Materials Research
|July 25, 2000
PubMed
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New bioactive composite microspheres made of polylactic acid and modified bioactive glass show promise for bone tissue engineering. These degradable materials promote calcium phosphate layer formation, essential for bone regeneration applications.

Area of Science:

  • Biomaterials Science
  • Materials Engineering
  • Tissue Engineering

Background:

  • Developing advanced biomaterials is crucial for effective bone tissue regeneration.
  • Biodegradable polymers and bioactive glasses offer unique properties for medical applications.
  • Composite materials can combine the advantages of different components for enhanced performance.

Purpose of the Study:

  • To develop novel bioactive and degradable composite microspheres.
  • To investigate the in vitro bioactivity and degradation behavior of these microspheres.
  • To evaluate their potential as microcarriers for bone tissue synthesis.

Main Methods:

  • Solid-in-oil-in-water emulsion solvent removal method for microsphere fabrication.
  • Encapsulation of modified bioactive glass (MBG) powders into a polylactic acid (PLA) matrix.

Related Experiment Videos

  • Surface characterization using Scanning Electron Microscopy (SEM) and Energy-Dispersive X-ray (EDX) analysis.
  • In vitro evaluation of surface reactivity via immersion in simulated physiological fluid (SPF).

    • Main Results:

    • Composite microspheres exhibited MBG powders embedded within the PLA matrix with surface micropores.
    • Complete transformation of the microsphere surface into carbonated calcium hydroxyapatite (c-HA) after 3 weeks in SPF.
    • PLA-only microspheres showed no calcium phosphate deposition.
    • Sustained release of silicon from MBG correlated with calcium and phosphorus uptake, indicating silicon's role in hydroxyapatite formation.

    Conclusions:

    • The developed bioactive, degradable composite microspheres demonstrate excellent in vitro bioactivity.
    • The released silicon from MBG plays a key role in the formation of a calcium-phosphate layer.
    • These microspheres show significant potential as effective microcarriers for bone and other tissue synthesis in vitro and in vivo.