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Biodegradable 3D printed HA/CMCS/PDA scaffold for repairing lacunar bone defect
Tao Chen1, Qingxia Zou2, Chang Du2
1Institute for Medical Devices Control, National Institutes for Food and Drug Control, Beijing 102629, PR China; School of Materials Science and Engineering, Beihang University, Beijing 100191, PR China.
Summary
Three-dimensional printed hydroxyapatite/carboxymethyl chitosan/polydopamine scaffolds show potential for bone regeneration. These porous, degradable implants effectively promoted new bone formation in rabbit femur defects without adverse effects.
Area of Science:
- Biomaterials Science
- Regenerative Medicine
- Orthopedic Engineering
Background:
- Porous bone scaffolds are crucial for bone regeneration.
- Natural bone's structure inspires novel scaffold designs.
- Three-dimensional (3D) printing offers precise control over scaffold architecture.
Purpose of the Study:
- To develop and evaluate novel 3D-printed porous degradable scaffolds for bone repair.
- To investigate the osteogenic properties of hydroxyapatite/carboxymethyl chitosan/polydopamine (HA/CMCS/PDA) scaffolds in vivo.
- To assess the biocompatibility and degradation characteristics of the developed scaffolds.
Main Methods:
- Fabrication of HA/CMCS/PDA scaffolds using 3D printing technology.
- Characterization of scaffold porosity, pore size, and degradation behavior in vitro.
- In vivo assessment of osteogenic potential and biocompatibility in rabbit femoral defect models using micro-CT and histology.
Main Results:
- The HA/CMCS/PDA scaffolds exhibited a porous structure (60.5% porosity, 415 μm pore diameter) and approximately 17% weight loss over 10 weeks.
- In vivo studies showed no adverse effects on rabbit organs and no inflammatory response at implantation sites.
- Micro-CT and histological analyses demonstrated significantly enhanced new bone formation in defects treated with HA/CMCS/PDA scaffolds compared to controls at 12 weeks.
Conclusions:
- 3D-printed HA/CMCS/PDA scaffolds possess excellent biodegradability that aligns with new bone formation.
- These scaffolds effectively stimulate bone regeneration and show great potential for repairing bone defects.
- The combination of HA, CMCS, and PDA in a 3D-printed porous structure offers a promising biomaterial for orthopedic applications.
