Validating continuous digital light processing (cDLP) additive manufacturing accuracy and tissue engineering utility...

Area of Science:

• Biomaterials Science
• Tissue Engineering
• Additive Manufacturing

Background:

• Accurate tissue engineering scaffolds are crucial for successful cell integration and tissue regeneration.
• Additive manufacturing technologies offer potential for creating complex scaffold architectures.
• Understanding the precision of these technologies is vital for clinical translation.

Purpose of the Study:

• To evaluate the accuracy of continuous digital light processing (cDLP) for rendering tissue engineering scaffolds.
• To assess the impact of scaffold accuracy on cell-scaffold interactions and potential for bone regeneration.
• To identify areas for improvement in cDLP-based scaffold fabrication.

Main Methods:

• Utilized cDLP additive manufacturing with poly (propylene fumarate) and a specific dye-initiator package (TiO2 and bis (2,4,6-trimethylbenzoyl)phenylphosphine oxide).
• Fabricated scaffolds with linear, round, and right-angle features to measure dimensional accuracy.
• Quantified feature accuracy and pore patency, and confirmed successful mesenchymal stem cell attachment.

Main Results:

• Most fabricated features demonstrated high accuracy, within 5.4-15% of the designed dimensions.
• An 800 µm circular pore feature showed a significant 35.7% reduction in patency, potentially due to light scattering.
• Demonstrated successful attachment of canine and human mesenchymal stem cells (MSCs) to the fabricated scaffolds.

Conclusions:

• cDLP technology can produce highly accurate scaffolds essential for guiding bone regeneration and resorption.
• Optimization of light scattering effects is needed to improve accuracy of specific features like pores.
• Accurate, resorbable scaffolds are critical for bone remodeling and achieving optimal regenerated bone strength.