Engineered assistive materials for 3D bioprinting: support baths and sacrificial inks.

Area of Science:

• Biotechnology
• Materials Science
• Regenerative Medicine

Background:

• Three-dimensional (3D) bioprinting aims to create tissue constructs mimicking native organs.
• A key challenge is the trade-off between bioink printability and biological function, impacting shape fidelity.
• Soft bioinks, ideal for cell viability, often lack structural integrity when printed in air.

Purpose of the Study:

• To explore the advantages of assistive materials in 3D bioprinting.
• To define material property requirements for effective assistive materials.
• To present case studies and discuss future opportunities in this field.

Main Methods:

• Review of assistive materials including support baths and sacrificial inks.
• Analysis of material properties influencing printability and biological function.
• Case study examples illustrating practical applications in 3D bioprinting.

Main Results:

• Assistive materials, such as yield-stress support baths and sacrificial inks, improve resolution and shape fidelity.
• Sacrificial inks can be used to create internal voids or modify bioink mechanical properties.
• These materials enable the fabrication of complex, biologically relevant geometries with soft bioinks.

Conclusions:

• Assistive materials are crucial for overcoming 3D bioprinting limitations, particularly with soft bioinks.
• Further development of assistive materials is needed to advance toward full-scale, biomimetic tissue and organ fabrication.
• Optimizing material properties and exploring novel applications will propel the field forward.