Structural Mechanical Properties of 3D Printing Biomimetic Bone Replacement Materials

Area of Science:

• Biomaterials Science
• Biomedical Engineering
• Tissue Engineering

Background:

• Developing bone substitutes with mechanical properties matching regenerated tissue is a key challenge.
• Scaffolds mimicking natural cancellous bone structure offer improved environmental adaptability.
• Biomimetic design parameters like porosity and thickness are crucial for scaffold performance.

Purpose of the Study:

• To design and evaluate biomimetic bone beam scaffolds using pig cancellous bone parameters.
• To investigate the influence of porosity and pore shape on scaffold mechanical properties.
• To validate finite element method (FEM) simulations against experimental results for scaffold design.

Main Methods:

• Utilized porosity and thickness of pig cancellous bone as biomimetic design parameters.
• Designed bone beam scaffolds with varying porosity and structural shapes (triangle, rectangle, honeycomb, diamond).
• Prepared Polycaprolactone/beta-tricalcium phosphate (PCL/β-TCP) scaffolds using fused deposition modeling (FDM) 3D printing.
• Assessed mechanical properties through FEM simulations and experimental testing.

Main Results:

• PCL/β-TCP scaffolds fabricated via FDM 3D printing exhibited excellent integrity and stability.
• FEM simulations effectively predicted scaffold structural stability.
• Triangle pore structures demonstrated the highest stability in both simulations and tests, outperforming rectangle, honeycomb, and diamond shapes.

Conclusions:

• Adjusting scaffold porosity and pore shape allows for tailoring mechanical properties to meet specific tissue engineering requirements.
• FEM is a reliable tool for predicting the structural stability of biomimetic bone scaffolds.
• Optimized pore geometry, specifically the triangle shape, enhances scaffold stability for cancellous bone regeneration.