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Ceramic Omnidirectional Bioprinting in Cell-Laden Suspensions for the Generation of Bone Analogs
Published on: August 8, 2022
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Functionalized 3D-printed scaffolds for enhanced osteogenesis and guided bone regeneration
Mohammad Hosseini Hooshiar1,2, Negin Ostadsharifmemar2, Tohid Javaheri3,2
1Department of Periodontics, School of Dentistry, Tehran University of Medical Sciences, Tehran, Iran.
Journal of Materials Chemistry. B
|May 15, 2025
Summary
This study presents novel 3D-printed scaffolds for bone regeneration, integrating polycaprolactone, chitosan, L-arginine, and β-tricalcium phosphate. These advanced materials enhance bone healing by modulating immune response and promoting osteogenesis.
Area of Science:
- Biomaterials Science
- Regenerative Medicine
- Tissue Engineering
Background:
- Large bone defects pose significant clinical challenges in dental and orthopedic applications.
- Current guided bone regeneration (GBR) strategies require innovative biomaterials to improve efficacy.
- Multifunctional scaffolds are needed to address complex biological requirements for bone healing.
Purpose of the Study:
- To develop and characterize a novel 3D-printed multifunctional scaffold for guided bone regeneration (GBR).
- To investigate the synergistic effects of polycaprolactone (PCL), chitosan (Cs), L-arginine (L-Arg), and β-tricalcium phosphate (β-TCP) on immunomodulation and osteogenesis.
- To evaluate the scaffold's potential for treating large bone defects.
Main Methods:
- Extrusion-based 3D printing was used to fabricate PCL/Cs-L-Arg/βTCP composite scaffolds.
- Mechanical properties, structural integrity, and L-arginine release kinetics were assessed.
- In vitro studies evaluated immunomodulatory effects on macrophages and osteogenic differentiation.
- Bioactivity was confirmed through calcium and phosphorus ion adsorption in simulated body fluid.
Main Results:
- The PCL/Cs-L-Arg/βTCP scaffolds exhibited favorable mechanical properties (Young's modulus ~32.84 MPa) and structural integrity for 60 days.
- Sustained L-arginine release over 21 days modulated macrophage phenotype from M1 to M2, reducing pro-inflammatory cytokines (IL-6, TNF-α) and increasing anti-inflammatory factors (BMP-2, TGF-β).
- Enhanced osteogenic activity was observed, with alkaline phosphatase activity nearly doubling compared to PCL/Cs scaffolds by day 21.
- Significant bioactivity was demonstrated by substantial reductions in calcium and phosphorus ions in simulated body fluid.
Conclusions:
- The developed 3D-printed PCL/Cs-L-Arg/βTCP scaffold represents a significant advancement in biomaterial design for GBR.
- The scaffold's integrated immunomodulatory and osteogenic properties create a pro-regenerative microenvironment.
- This innovative approach holds transformative potential for treating large bone defects in clinical dental and orthopedic applications.
