Advanced Dynamic Slurry Circulation System for Precision 3D Bioprinting of Osteogenic Ceramics: Enhanced Stability,...

Area of Science:

• Materials Science
• Biomaterials Engineering
• Additive Manufacturing

Background:

• Traditional 3D printing of ceramics faces challenges with low-viscosity slurries, particularly sedimentation and achieving high precision.
• Low-solid-content slurries are difficult to process due to sintering shrinkage, yet offer potential for cost-effective, high-accuracy ceramic fabrication.

Purpose of the Study:

• To develop and validate an improved 3D printing technology incorporating a slurry circulation system (SCS) for low-viscosity ceramic slurries.
• To assess the impact of SCS on slurry stability, printing precision, and the quality of fabricated bioceramics.
• To evaluate the biocompatibility and osteogenic potential of the 3D-printed bioceramics for bone tissue engineering.

Main Methods:

• Fluid dynamics simulations and sedimentation experiments using COMSOL Multiphysics to validate the SCS.
• Fabrication of bioceramics with triply periodic minimal surface (TPMS) structures using the modified 3D printing technology.
• Characterization of porosity, pore size, mechanical properties, and in vitro biocompatibility using MC3T3-E1 cells.

Main Results:

• The SCS significantly reduced slurry sedimentation and improved printing precision, achieving a 97.73% yield of high-quality ceramics.
• Fabricated bioceramics exhibited high porosity (~70%), small pore sizes (~50 μm), and favorable mechanical properties (e.g., Gyroid structure: 4.00 ± 0.42 MPa compressive strength).
• In vitro cell studies confirmed no adverse effects on cell viability, proliferation, migration, or osteogenic differentiation, indicating excellent biocompatibility.

Conclusions:

• The integrated SCS effectively optimizes the 3D printing of low-viscosity, low-solid-content ceramic slurries, enabling high-precision fabrication.
• The developed 3D-printed bioceramics possess suitable structural, mechanical, and biocompatibility characteristics for bone tissue engineering.
• This cost-effective approach offers a promising solution for advanced bioceramic manufacturing.