Development of a Modular Reinforced Bone Tissue Engineering Scaffold with Enhanced Mechanical Properties

Area of Science:

• Biomaterials Engineering
• Tissue Engineering
• Regenerative Medicine

Background:

• Developing advanced scaffolds is crucial for tissue regeneration.
• Existing scaffolds often lack optimal mechanical strength and bioactivity.
• Modular designs offer a promising approach to combine material properties.

Purpose of the Study:

• To develop and characterize a novel modular scaffold for tissue engineering.
• To investigate the effect of surface treatment on polycaprolactone (PCL) module bonding.
• To evaluate the mechanical enhancement and bio-reactivity of the modular scaffold.

Main Methods:

• Fabrication of a modular scaffold using 3D-printed polycaprolactone (PCL) and dual porosity gelatin foam.
• Surface treatment of PCL via aminolysis-aldehyde process and comparison with NaOH hydrolysis.
• Mechanical testing (compressive modulus, ultimate strength) of the modular scaffold.
• Scanning Electron Microscopy (SEM) to assess dental pulp stem cell (DPSC) attachment.

Main Results:

• Aminolysis-aldehyde surface treatment yielded superior interface bonding compared to NaOH hydrolysis.
• The modular scaffold demonstrated over a 10-fold increase in compressive modulus and ultimate strength of the gelatin foam.
• The gelatin foam exhibited a dual porosity network (100-300 μm primary, <10 μm secondary pores).
• SEM confirmed excellent attachment of DPSCs to the bio-reactive gelatin foam module.

Conclusions:

• A novel modular scaffold combining 3D-printed PCL and dual porosity gelatin foam was successfully developed.
• The modular design significantly enhances the mechanical integrity of the gelatin foam.
• The scaffold supports DPSC attachment, indicating potential for regenerative applications.