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Integrating pore architectures to evaluate vascularization efficacy in silicate-based bioceramic scaffolds
Fanghui Wu1, Jun Yang1, Xiurong Ke1
1Department of Orthopaedics, The Third Hospital Affiliated to Wenzhou Medical University & Rui'an People's Hospital, Rui'an 325200, China.
Regenerative Biomaterials
|April 28, 2022
Summary
Bioceramic scaffold pore architecture significantly impacts bone repair and vascularization. Gyroid pore structures promote faster biodegradation and superior blood vessel ingrowth compared to cube and hexagon designs.
Area of Science:
- Biomaterials Engineering
- Tissue Engineering
- Regenerative Medicine
Background:
- Pore architecture in bioceramic scaffolds is crucial for vascularization in bone repair and orbital reconstruction.
- Optimizing pore geometry, size, and curvature is hindered by a lack of integrated design strategies.
Purpose of the Study:
- To develop an integrated design strategy for fabricating bioceramic scaffolds with controlled pore architectures (cube, gyroid, hexagon) and dimensions (350-650 μm).
- To evaluate the influence of these pore architectures on mechanical properties, biodegradation, and vascularization efficiency in vivo.
Main Methods:
- Digital Light Processing (DLP) technique used to fabricate silicate-based bioceramic scaffolds with cube, gyroid, and hexagon pore architectures.
- Scaffolds characterized for pore fidelity, mechanical strength (compressive strength, elastic modulus), in vitro biodegradation (ion dissolution, mass decay).
- In vivo vascularization assessed using micro-CT and histological analysis in rabbit models at 2 and 4 weeks.
Main Results:
- Sintered scaffolds accurately replicated designed pore architectures.
- Hexagon and gyroid scaffolds showed highest and lowest compressive strength (15-55 MPa); cube scaffolds had notable elastic modulus.
- Gyroid architecture exhibited faster in vitro ion dissolution and mass decay.
- Gyroid scaffolds demonstrated significant vascularization at 350 μm (2 weeks) and uniform high-density vessel infiltration at 500-650 μm (4 weeks).
- Hexagon scaffolds showed limited vascularization even at 650 μm (2 weeks); cube scaffolds showed enhanced angiogenesis compared to hexagon scaffolds (4 weeks).
Conclusions:
- Continuous pore wall curvature in gyroid architecture is key for enhanced biodegradation, vascular cell migration, and vessel ingrowth in bioceramic scaffolds.
- Pore architecture design is a critical factor for optimizing vascularization and clinical outcomes in bone regeneration.
- The gyroid pore structure shows significant potential for promoting rapid and efficient vascularization in bone defect applications.
