| Autor: |
Makarov, C., Berdicevsky, I., Raz-Pasteur, A., Gotman, I. |
| Předmět: |
|
| Zdroj: |
Journal of Materials Science: Materials in Medicine; Mar2013, Vol. 24 Issue 3, p679-687, 9p, 1 Color Photograph, 1 Black and White Photograph, 1 Chart, 5 Graphs |
| Abstrakt: |
Release of antimicrobial agents from bone healing devices can dramatically reduce the risk of implant-associated infection. Here we report the fabrication and antimicrobial activity of a multifunctional load-bearing bioresorbable material that can provide mechanical support to the healing bone all while slowly releasing an antibiotic drug. Dense beta-tricalcium phosphate (β-TCP)-40 vol% polylactic acid (PLA) nanocomposite containing 1 wt% vancomycin (VH) was high pressure consolidated at 2.5 GPa, at room temperature, or at 120 °C. Over the course of 5 weeks in TRIS solution, the β-TCP-PLA-VH nanocomposite released approximately 90 % of its drug load. Specimens consolidated at 120 °C had the highest initial mechanical properties and maintained 85 % of their compressive strength and 30 % of their bending strength after 5 weeks release. In vitro growth inhibition study showed significant antimicrobial efficacy of VH-impregnated β-TCP-PLA against methicillin-resistant Staphylococcus aureus when exposed to both high (2 × 10 CFU/mL) and very high (1 × 10 CFU/mL) bacterial concentrations. After 1 week, total eradication of the microorganisms was achieved. The results suggest that the developed high-strength antibiotic-eluting β-TCP-PLA nanocomposite can be a promising material for orthopedic surgical devices. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
|
Full text from SpringerLink