| Autor: |
Van Den Vreken, Natasja M. F., Pieters, Ilse Y., De Maeyer, Erna A. P., Jackers, Geert J., Schacht, Etienne H., Verbeeck, Ronald M. H. |
| Předmět: |
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| Zdroj: |
Journal of Biomaterials Science -- Polymer Edition; Sep2006, Vol. 17 Issue 9, p953-967, 15p, 3 Charts, 4 Graphs |
| Abstrakt: |
The objective of this study was to investigate the conversion of α-Ca3(PO4)2 (α-TCP) in composite bone cements based on a water-degradable polyester matrix as a function of the polymer formulation and the α-TCP filler content. Cross-linkable dimethacrylates of ε-caprolactone/D,L-lactide co-polymer or of ε-caprolactone/glycolide co-polymer were mixed with hydroxyethyl-methacrylate, a photo-initiator and α-TCP to obtain composites with a filler content of 80 or 40 wt% α-TCP. The disk shaped composite samples were set by visible light irradiation and immersed in HEPES at 37°C. At selected times the samples were removed from the solution and analysed with X-ray diffractometry and infrared spectroscopy. Conversion of α-TCP into calcium-deficient hydroxy-apatite (CDHAp) was observed for all composites, but the reaction was not completed after 8 weeks immersion. The conversion rate of α-TCP and the crystallinity of the formed apatite apparently were not affected by the type of polyester used, but significantly depended on the α-TCP content of the composites. An increase of the amount of α-TCP in the composite resulted in a slower formation of CDHAp with a higher crystallinity. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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