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Design of segmented poly(ether ester) materials and structures for the tissue engineering of bone
Audrey A Deschamps1, Menno B Claase, Warnerie J Sleijster
1Department of Polymer Chemistry and Biomaterials, Faculty of Chemical Technology, Institute for Biomedical Technology (BMTI), University of Twente, P.O. Box 217, 7500 AE, Enschede, The Netherlands.
Summary
Poly(ethylene oxide terephthalate)/poly(butylene terephthalate) (PEOT/PBT) copolymers show promise as bone tissue engineering scaffolds. Surface modification enhances cell adhesion, making these materials suitable for bone regeneration.
Area of Science:
- Biomaterials Science
- Tissue Engineering
- Polymer Chemistry
Background:
- Developing suitable scaffold materials is crucial for bone tissue engineering.
- Poly(ethylene oxide terephthalate)/poly(butylene terephthalate) (PEOT/PBT) segmented copolymers offer tunable properties.
- Understanding their mechanical, degradation, and biological interaction is essential.
Purpose of the Study:
- To evaluate PEOT/PBT copolymers as scaffold materials for bone tissue engineering.
- To investigate the effect of copolymer composition on material properties and cell interactions.
- To assess the potential of surface modification for enhancing cell adhesion and growth.
Main Methods:
- Synthesis and characterization of PEOT/PBT copolymers with varying compositions.
- Mechanical testing (tensile strength, elongation at break) and swelling behavior analysis.
- In vitro degradation studies (hydrolysis and oxidation).
- Scaffold fabrication using molding, freeze-drying, and particulate-leaching techniques.
- In vitro cell culture studies with goat bone marrow cells, including surface modification via gas plasma treatment.
Main Results:
- PEOT/PBT copolymers exhibited a wide range of mechanical properties (tensile strength 8-23 MPa, elongation 500-1300%) and water-uptake (4-210%).
- Degradation occurred via hydrolysis and oxidation, accelerated by higher poly(ethylene oxide) content.
- Unmodified hydrophilic copolymers showed poor cell adhesion; however, gas plasma treatment significantly improved cell interaction across all compositions.
- Scaffolds with controlled porosity and pore size were successfully fabricated.
Conclusions:
- PEOT/PBT copolymers possess tunable mechanical properties and degradation profiles suitable for bone tissue engineering.
- Surface modification, particularly gas plasma treatment, is critical for promoting bone marrow cell adhesion and growth on PEOT/PBT scaffolds.
- These copolymers demonstrate excellent potential as advanced biomaterials for bone regeneration applications.