ISSN:
1662-8985
Quelle:
Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
Thema:
Maschinenbau
Notizen:
Porous biomaterials including porous bioceramics play important roles for hard tissuereplacement and regeneration. I this paper, porous alumina (with and without zirconia addition)ceramics were produced via coating polyurethane (PU) foams with Al2O3 (ZrO2) slurries, followedby drying at room temperature and sintering at 1300 oC. The advantage of the PU foam method wasthe achieved high pore interconnectivity, but the mechanical properties of the porous ceramics wererather poor due to the high macroporosity and the high microporosity. To remove the microporosityand strengthen the porous alumina ceramics, a lanthanum-modified aluminosilicate (LAS) glass wasused to infiltrate the alumina struts. Nevertheless, the resulting LAS-modified macroporous aluminaceramics would have no ability to bond to bone tissues. To impart a bioactivity (i.e. the ability ofbone bonding) to the bioinert porous ceramics, a bioactive glass layer was applied by dipping withthe bioactive glass slurry and sintering at 1200 oC. The twice coated porous alumina ceramicswould exhibit high compressive strengths, allow bone tissue ingrowth, and form strong bonematerialintegration. A biodegradable filler – calcium phosphate cement was also incorporated. Apossible application of the porous bioceramics would be for the maxillofacial reconstruction
Materialart:
Digitale Medien
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/01/40/transtech_doi~10.4028%252Fwww.scientific.net%252FAMR.32.211.pdf
