| Autor: |
Strickstrock, Monika, Rothe, Holger, Grohmann, Steffi, Hildebrand, Gerhard, Zylla, Isabella M., Liefeith, Klaus |
| Zdroj: |
BioNanoMaterials; September 2016, Vol. 18 Issue: 1-2 |
| Abstrakt: |
It is generally accepted that a micrometer scale roughness supports the osseointegration of titanium implants. While abrasive technologies can easily be employed to create a micro-topography on titanium surfaces, the preparation of rough ceramic surfaces is more challenging. Typically, abrasive treatments of yttria-stabilized tetragonal zirconia polycrystal (Y-TZP) surfaces result in rather smooth topographies (Ra<0.6 μm). Furthermore, when this sandblasting process is performed after firing, a transformation of the tetragonal into the monoclinic phase is observed. Exceeding phase transformation may lead to a decreased flexural strength and an increased brittleness – two highly undesirable processes for a ceramic for load bearing applications. In the present study Y-TZP surfaces were sandblasted between the pre-sintering and the final sintering step. Instead of corundum particles, sintered Y-TZP grit was employed for blasting. By varying the particle size and the sandblasting pressure, moderately rough (Ra~1.7 μm) and rough (Ra~3 μm) Y-TZP surfaces could be prepared. The resulting rough Y-TZP materials were analyzed with respect to their microstructure, flexural strength and 3D surface topography. The results of the subsequent in vitro and in vivo experiments reveal a cytocompatibility and a bone-implant contact that is well comparable to the reference material titanium SLA (sandblasted, large grit, acid etched). |
| Databáze: |
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