Robocasting of Ceramic Fischer-Koch S Scaffolds for Bone Tissue Engineering

Bone tissue engineering requires scaffolds that mimic natural bone structure and support cell growth. Triply Periodic Minimal Surfaces (TPMS) are known for their mechanical and structural advantages in this context. Calcium phosphate-based materials like hydroxyapatite are widely used for their compatibility with bone. However, the brittleness of these materials limits their use in certain applications. 3D printing of TPMS structures, such as gyroids, has been explored for bone regeneration due to their interconnected porosity and mechanical properties. Despite this, other TPMS topologies like Fischer-Koch S (FKS) have not been fully tested in laboratory settings. One barrier is the lack of accessible algorithms to model and print FKS scaffolds using low-cost 3D printing systems. This gap motivated the development of new software and fabrication methods to explore FKS scaffolds for bone regeneration.

This study aimed to address the gap in FKS scaffold fabrication by developing a software solution for 3D printing these structures. The goal was to enable low-cost production of FKS scaffolds using hydroxyapatite, a common biomaterial in bone engineering. The researchers sought to test whether FKS topology could be successfully printed and whether it would exhibit desirable structural properties for bone regeneration. The motivation was to expand the range of TPMS scaffolds available for clinical use. By integrating a new algorithm with a cost-effective printing method, the study aimed to demonstrate the feasibility of FKS scaffolds in bone tissue engineering. The researchers also wanted to evaluate the dimensional accuracy and porosity of the printed scaffolds. This work contributes to the broader goal of improving scaffold design for better bone regeneration outcomes.

The researchers developed an open-source software algorithm to generate 3D-printable FKS and gyroid scaffold cubes. The framework accepts any continuous differentiable implicit function, allowing flexibility in scaffold design. They integrated this algorithm with a low-cost 3D printing system that combines robocasting and layer-wise photopolymerization. Using hydroxyapatite, they fabricated FKS scaffolds and compared them to gyroid structures. The printing process was validated for dimensional accuracy using standard measurement techniques. Internal microstructure and porosity were analyzed using imaging methods. The team also assessed the mechanical and structural properties of the printed scaffolds. These methods were chosen to evaluate the feasibility of FKS scaffolds for bone regeneration applications.

The developed algorithm successfully generated 3D-printable FKS and gyroid scaffold cubes. The hydroxyapatite scaffolds were printed using a low-cost method that combined robocasting and photopolymerization. The dimensional accuracy of the printed scaffolds was confirmed through measurements. The internal microstructure showed a consistent and reproducible porosity pattern. The porosity characteristics were found to be suitable for bone tissue engineering applications. The scaffolds exhibited a high surface area per volume, which is beneficial for cell attachment and growth. The results suggest that FKS topology can be effectively used in 3D printing for bone regeneration. The study demonstrated the potential of FKS scaffolds as a viable alternative to other TPMS structures.

The study demonstrated that the developed algorithm enables the fabrication of FKS scaffolds using low-cost 3D printing methods. The printed hydroxyapatite scaffolds showed dimensional accuracy and suitable porosity for bone regeneration. The results suggest that FKS topology can be a valuable addition to existing TPMS structures in bone tissue engineering. The open-source framework allows for further exploration of other TPMS topologies. The combination of robocasting and photopolymerization proved effective for scaffold fabrication. The findings support the potential of FKS scaffolds in future clinical applications. The study contributes to the growing field of 3D-printed biomaterials for regenerative medicine. The authors propose that this approach could expand the range of available scaffold designs for bone tissue engineering.