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Related Experiment Video

Updated: Jun 2, 2025

Fabrication of Mechanically Tunable and Bioactive Metal Scaffolds for Biomedical Applications
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3D Printed Titanium Scaffolds with Bi-Directional Gradient QK-Functionalized Surface.

Xiaoyun Sun1,2,3, Ru Zhong1,2,3, Congcong Wu4

  • 1National Engineering Research Center for Tissue Restoration and Reconstruction, South China University of Technology, Guangzhou, 510006, China.

Advanced Materials (Deerfield Beach, Fla.)
|January 15, 2025
PubMed
Summary

A novel 3D printed titanium scaffold with a bi-directional gradient QK peptide surface enhances bone healing. This strategy promotes cell migration, vascularization, and stable osteointegration for orthopedic applications.

Keywords:
3D printed scaffoldangiogenesisgradient surfaceosteointegrationtitanium

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Area of Science:

  • Biomaterials Engineering
  • Orthopedic Surgery
  • Tissue Engineering

Background:

  • 3D printed titanium scaffolds offer orthopedic potential but lack bioactivity for osteointegration.
  • Bioinert titanium requires surface modification to promote vascularization and tissue ingrowth.

Purpose of the Study:

  • To develop a 3D printed titanium scaffold with a bi-directional gradient QK peptide surface.
  • To enhance cell migration, vascularization, and osteointegration for improved bone repair.

Main Methods:

  • Fabrication of a modular porous titanium scaffold using 3D printing.
  • Immobilization of QK peptide with a bi-directional gradient distribution on the scaffold surface.
  • In vitro cell culture and in vivo animal studies (rabbit bone defect, sheep spine repair).

Main Results:

  • Gradient QK peptide distribution positively influenced endothelial cell migration and angiogenesis in vitro.
  • The bi-directional gradient scaffold (Ti-G) significantly enhanced new tissue growth, vascularization, and osteointegration compared to uniform surfaces in vivo.
  • Micro-CT and staining confirmed improved bone regeneration and scaffold integration.

Conclusions:

  • A bi-directional gradient strategy effectively enhances the bioactivity of peptide-functionalized 3D printed titanium scaffolds.
  • This approach promotes cell migration towards the scaffold interior, facilitating vascularization and osteointegration.
  • The developed scaffold shows significant potential for orthopedic applications and bone defect repair.