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Porous poly(alpha-hydroxyacid)/Bioglass composite scaffolds for bone tissue engineering. I: Preparation and in vitro
V Maquet1, A R Boccaccini, L Pravata
1Centre for Education and Research on Macromolecules, University of Liège, Belgium.
Biomaterials
|March 30, 2004
Summary
Adding bioactive glass to poly(lactide-co-glycolide) scaffolds improves mechanical properties and delays degradation. These composite scaffolds show potential for tissue engineering applications due to their enhanced bioactivity and controlled degradation.
Area of Science:
- Biomaterials Science
- Polymer Chemistry
- Tissue Engineering
Background:
- Poly(D,L-lactide) (PDLLA) and poly(lactide-co-glycolide) (PLGA) are commonly used biodegradable polymers for tissue engineering scaffolds.
- Bioactive glasses, such as 45S5 Bioglass, can promote bone regeneration and enhance scaffold integration.
- Developing composite scaffolds with tailored properties is crucial for optimizing tissue regeneration outcomes.
Purpose of the Study:
- To prepare and characterize porous composite scaffolds of PDLLA/PLGA incorporating varying amounts of 45S5 Bioglass.
- To investigate the effect of Bioglass content on the structural, mechanical, and degradation properties of the composite scaffolds.
- To evaluate the in vitro bioactivity of the composite scaffolds through hydroxyapatite formation.
Main Methods:
- Composite scaffolds were fabricated using thermally induced solid-liquid phase separation (TIPS) and solvent sublimation.
- Scaffold characterization included pore volume analysis, mechanical testing, and in vitro degradation studies (water absorption, weight loss, molecular weight change, pH monitoring).
- Bioactivity was assessed by detecting hydroxyapatite formation using Energy Dispersive X-ray Analysis (EDXA), X-ray diffractometry, and Raman spectroscopy.
Main Results:
- Increasing Bioglass content reduced pore volume but enhanced mechanical properties of the scaffolds.
- Composite scaffolds exhibited increased water absorption and weight loss compared to neat polymer scaffolds.
- The presence of Bioglass significantly delayed polymer degradation, as evidenced by a slower decrease in molecular weight.
- Hydroxyapatite formation on the scaffold surface confirmed their bioactivity.
Conclusions:
- PDLLA/PLGA composite scaffolds containing 45S5 Bioglass offer improved mechanical strength and delayed degradation rates.
- The incorporation of Bioglass enhances the bioactivity of the scaffolds, indicated by hydroxyapatite formation.
- These findings suggest that Bioglass-reinforced PDLLA/PLGA composite scaffolds are promising candidates for bone tissue engineering applications.