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Fabrication of a Bioactive, PCL-based "Self-fitting" Shape Memory Polymer Scaffold
Published on: October 23, 2015
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Temperature-responsive PCL-PLLA nanofibrous tissue engineering scaffolds with memorized porous microstructure
Seth M Woodbury1,2,3, W Benton Swanson1, Lindsey Douglas1,2
1Department of Biologic and Materials Science, Division of Prosthodontics, School of Dentistry, University of Michigan, Ann Arbor, MI, United States.
Frontiers in Dental Medicine
|April 12, 2024
Summary
This study introduces a novel thermosensitive memorized microstructure (TS-MMS) biomaterial scaffold that recovers its shape after deformation. This innovation improves tissue integration and regeneration for complex bone defects.
Area of Science:
- Biomaterials Science
- Tissue Engineering
- Regenerative Medicine
Background:
- Biomaterial scaffolds are crucial for tissue regeneration but often fail due to poor cell infiltration and ill-fitting interfaces.
- Existing scaffolds lack the ability to conform to irregular defects without compromising structural integrity, leading to adverse tissue responses.
- Deformable scaffolds that retain their microstructure are needed for improved clinical handling and integration.
Purpose of the Study:
- To develop a synthetic biomaterial scaffold with a thermosensitive memorized microstructure (TS-MMS) capable of conformal fitting and shape recovery.
- To investigate the fabrication, mechanical properties, and drug-delivery capabilities of the TS-MMS scaffold.
- To evaluate the in vivo performance of the TS-MMS scaffold for tissue integration and regeneration.
Main Methods:
- Fabrication of TS-MMS scaffolds using poly (L-lactic acid) (PLLA) and poly (ε-caprolactone) (PCL) via thermally induced phase separation (TIPS).
- Characterization of nanofibrous and macroporous structures, and assessment of shape recovery after deformation above a critical melting temperature (52°C).
- Incorporation of drug-loaded poly (lactide-co-glycolide) (PLGA) nanoparticles for sustained drug release and in vivo implantation studies in mice.
Main Results:
- TS-MMS scaffolds exhibited memorized microstructures (nanofibers and macropores) that recovered after deformation and cooling to 37°C.
- Sustained release of a model drug from embedded PLGA nanoparticles was achieved for up to 40 days.
- In vivo studies demonstrated successful cellularization and integration of deformed/recovered TS-MMS scaffolds, promoting cell and vasculature infiltration.
Conclusions:
- TS-MMS scaffolds offer enhanced clinical adaptability and performance compared to conventional biomaterial scaffolds.
- The ability to deform and recover morphology facilitates better integration with irregular tissue defects.
- The scaffold's capacity for controlled drug delivery further enhances its potential for bone regeneration and tissue maturation.
