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The surface functionalization of 45S5 Bioglass®-based glass-ceramic scaffolds and its impact on bioactivity

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Abstract

The first and foremost function of a tissue engineering scaffold is its role as a substrate for cell attachment, and their subsequent growth and proliferation. However, cells do not attach directly to the culture substrate; rather they bind to proteins that are adsorbed to the scaffold’s surface. Like standard tissue culture plates, tissue engineering scaffolds can be chemically treated to couple proteins without losing the conformational functionality; a process called surface functionalization. In this work, novel highly porous 45S5 Bioglass®-based scaffolds have been functionalized applying 3-AminoPropyl-TriethoxySilane (APTS) and glutaraldehyde (GA) without the use of organic solvents. The efficiency and stability of the surface modification was assessed by X-ray photoemission spectroscopy (XPS). The bioactivity of the functionalized scaffolds was investigated using simulated body fluid (SBF) and characterized by scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS) and X-ray diffraction (XRD). It was found that the aqueous heat-treatment applied at 80∘C for 4 hrs during the surface functionalization procedure accelerated the structural transition of the crystalline Na2Ca2Si3O9 phase, present in the original scaffold structure as a result of the sintering process used for fabrication, to an amorphous phase during SBF immersion. The surface functionalized scaffolds exhibited an accelerated crystalline hydroxyapatite layer formation upon immersion in SBF caused by ion leaching and the increased surface roughness induced during the heat treatment step. The possible mechanisms behind this phenomenon are discussed.

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Authors and Affiliations

  1. Department of Materials, Imperial College London, Prince Consort Road, London, SW7 2BP, UK

    Q. Z. Chen, K. Rezwan & A. R. Boccaccini

  2. Biomaterials and Tissue Engineering, UCL Eastman Dental Institute, 256 Gray’s Inn Road, London, WC1X 8LD, UK

    D. Armitage & S. N. Nazhat

Authors
  1. Q. Z. Chen
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  2. K. Rezwan
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  3. D. Armitage
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  4. S. N. Nazhat
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  5. A. R. Boccaccini
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Corresponding author

Correspondence to A. R. Boccaccini.

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Q. Z Chen and K. Rezwan both authors contributed equally to this work.

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Chen, Q.Z., Rezwan, K., Armitage, D. et al. The surface functionalization of 45S5 Bioglass®-based glass-ceramic scaffolds and its impact on bioactivity. J Mater Sci: Mater Med 17, 979–987 (2006). https://doi.org/10.1007/s10856-006-0433-y

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  • DOI: https://doi.org/10.1007/s10856-006-0433-y

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