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Bioinstructive 3D-Printed Magnesium-Baghdadite Bioceramic Scaffolds for Bone Tissue Engineering
Anyu Zhang1,2,3, Zufu Lu1, Iman Roohani1,4
1School of Biomedical Engineering, Tissue Engineering and Biomaterials Research Unit, Faculty of Engineering University of Sydney, Sydney, New South Wales 2006, Australia.
ACS Applied Materials & Interfaces
|February 27, 2025
Summary
This study developed advanced 3D bioceramic scaffolds using ion-assisted plasma polymerization (IAPP) for enhanced bone regeneration. These bioinstructive interfaces improve cell response and show great potential for future bone repair applications.
Area of Science:
- Biomaterials Science
- Regenerative Medicine
- Materials Engineering
Background:
- Current synthetic bioceramic scaffolds often lack bioinstructive capabilities for effective bone regeneration.
- Magnesium-doped baghdadite (Mg-BAG) scaffolds possess promising osteoinductive and mechanical properties.
- 3D printing techniques enable the fabrication of complex scaffold architectures.
Purpose of the Study:
- To develop bioinstructive interfaces on 3D Mg-BAG scaffolds using ion-assisted plasma polymerization (IAPP).
- To enhance the osteoinductive properties and biocompatibility of bioceramic scaffolds for bone regeneration.
- To investigate the potential of IAPP-functionalized scaffolds as next-generation cell-free constructs.
Main Methods:
- Fabrication of Mg-BAG scaffolds using liquid crystal display 3D printing.
- Adaptation of IAPP for 3D structures to create homogeneous bioinstructive coatings.
- Evaluation of coating attachment, ion release, BMP2 release kinetics, and cellular response (proliferation, osteogenic gene expression) in human osteoblast-like cells (HOBs).
Main Results:
- IAPP coatings demonstrated strong attachment to Mg-BAG scaffolds after 1 month of incubation.
- Coating robustness was linked to nanoscale growth mechanisms, transitioning from island formation to a smooth structure.
- Biofunctionalized scaffolds enhanced silicon ion release, slowed bone morphogenetic protein 2 (BMP2) release, and showed superior biocompatibility and osteoinductivity compared to physisorbed BMP2.
- Sustained cell proliferation and elevated osteogenic gene expression were observed in HOBs.
Conclusions:
- Ion-assisted plasma polymerization (IAPP) is effectively adapted for complex 3D bioceramic structures, moving beyond 2D applications.
- IAPP-functionalized Mg-BAG scaffolds exhibit enhanced bioinstructive properties and potential for bone regeneration.
- These advanced scaffolds represent a promising next generation of cell-free constructs for regenerative medicine applications.
