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Bioactive glass/polymer composite scaffolds mimicking bone tissue.

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Summary

This study developed chitosan/gelatin scaffolds with bioactive glass for bone regeneration. The composite materials demonstrated good stability, bioactivity, and biocompatibility, showing potential for bone tissue engineering applications.

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Area of Science:

  • Biomaterials Science
  • Tissue Engineering
  • Bioceramics

Background:

  • Developing effective bone regeneration scaffolds is crucial for treating bone defects.
  • Chitosan/gelatin blends offer biocompatibility but require enhanced mechanical properties and bioactivity.
  • Bioactive glasses can stimulate biomineralization and improve scaffold performance.

Purpose of the Study:

  • To prepare and characterize porous chitosan/gelatin scaffolds incorporating bioactive glass (CEL2) for bone regeneration.
  • To evaluate the mechanical properties, stability, bioactivity, and biocompatibility of these composite scaffolds.
  • To assess the influence of varying CEL2 content and genipin (GP) crosslinking on scaffold characteristics.

Main Methods:

  • Fabrication of chitosan/gelatin (POL) scaffolds with different CEL2 compositions (0/100, 40/60, 70/30 wt%/wt) using freeze-drying.
  • Genipin (GP) crosslinking to enhance mechanical strength and thermal stability.
  • Characterization including water stability, chemical structure, morphology, bioactivity (SBF soaking), mechanical behavior (compressive modulus, DMA), and cell viability (MTT assay) using MG63 osteoblast-like cells and stem cells.

Main Results:

  • Scaffolds exhibited interconnected pores with sizes ranging from 179 ± 5 μm to 136 ± 5 μm.
  • GP-crosslinking and increased CEL2 content improved composite stability in water.
  • Scaffolds with 30% and 70% CEL2 showed good bioactivity, and compressive modulus increased with CEL2 content up to 2.1 ± 0.1 MPa.
  • Cell studies indicated good interaction and no significant negative impact on metabolic activity.

Conclusions:

  • Composite scaffolds of chitosan/gelatin and bioactive glass demonstrate promising properties for bone regeneration.
  • The addition of CEL2 and GP crosslinking enhances scaffold stability, bioactivity, and mechanical strength.
  • These materials exhibit good biocompatibility, supporting cell interaction and proliferation for tissue engineering applications.