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Elastic 3D-Printed Nanofibers Composite Scaffold for Bone Tissue Engineering.

Pengfei Cai1, Chunchun Li2, Yangfan Ding1

  • 1Shanghai Engineering Research Center of Nano-Biomaterials and Regenerative Medicine & College of Biological Science and Medical Engineering, Donghua University, Shanghai 201620, P. R. China.

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Summary

This study introduces novel nanofiber-infused 3D-printed scaffolds for bone defects, outperforming nanoparticle methods. These scaffolds offer enhanced mechanical properties, bioactivity, and osteoinductivity for improved bone tissue engineering.

Keywords:
3D printingbone regenerationnanofibersscaffoldtissue engineering

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Area of Science:

  • Biomaterials Science
  • Tissue Engineering
  • Nanotechnology

Background:

  • Conventional nanoparticle-loaded hydrogels for 3D printing have limited efficacy in enhancing scaffold properties.
  • Improving the printability and physicochemical characteristics of 3D-printed scaffolds is crucial for bone defect regeneration.

Purpose of the Study:

  • To develop a novel composite scaffold using electrospun nanofibers and 3D printing for bone defect repair.
  • To evaluate the mechanical properties, bioactivity, and osteoinductivity of nanofiber-reinforced scaffolds compared to nanoparticle-reinforced ones.

Main Methods:

  • Silica nanofibers were synthesized using high-speed homogenization and low-temperature ball milling.
  • Nanofibers were blended with sodium alginate to create a printable ink for 3D printing.
  • Composite scaffolds were fabricated and characterized for morphology, mechanical attributes, and bioactivity.

Main Results:

  • The nanofiber-infused ink exhibited excellent extrusion and molding properties, yielding scaffolds with favorable macroscopic morphology.
  • Nanofiber composite scaffolds demonstrated superior mechanical properties and bioactivity compared to nanoparticle-reinforced scaffolds.
  • Enhanced osteoinductive properties were observed in vitro and in vivo.

Conclusions:

  • A novel "reinforced concrete"-like composite scaffold was successfully fabricated using 3D printing and electrospun nanofibers.
  • This nanofiber-infused 3D-printed scaffold approach shows significant potential to advance bone tissue engineering applications.
  • The developed scaffolds offer a promising alternative for addressing bone defects with improved regenerative capabilities.