Y-TZP ceramics for artificial joint replacements

C. Piconi, W. Burger, H.G. Richter, A. Cittadini, G. Maccauro, V. Covacci, N. Bruzzese, G.A. Ricci, E. Marmo

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Abstract

Due to their excellent mechanical properties, Yttria-stabilized Tetragonal Zirconia Polycrystal ceramics (Y-TZP) are used in ball heads for Total Hip Replacements. It is known that Y-TZP materials may show strength degradation due to ageing or to hydrothermal treatment. Also high wear of UHMWPE sockets coupled to steam sterilized Y-TZP ball heads after a short implantation period was recently reported. This effect may be related to ball head surface phase transformation, due to corrosive attack. The aim of this study is the evaluation of Y-TZP ceramics stability. Y-TZP made out of Yttria coated powders were aged at 140°C under 0.2 MPa water pressure, in Ringer's solution at 37°C, in NZW rabbits. Samples made out Yttria coated powders show lower strength degradation than samples made out coprecipitated powders, and UHMWPE discs coupled to Y-TZP rings made out coated powders do not show increase in wear after repeated sterilization cycles of the ceramic rings.
Original languageEnglish
Pages (from-to)1489 - 1494
Number of pages6
JournalBiomaterials
Volume19
Issue number16
DOIs
Publication statusPublished - Aug 1998
Externally publishedYes

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All Science Journal Classification (ASJC) codes

  • Biotechnology
  • Bioengineering
  • Biomedical Engineering

Cite this

Piconi, C., Burger, W., Richter, H. G., Cittadini, A., Maccauro, G., Covacci, V., Bruzzese, N., Ricci, G. A., & Marmo, E. (1998). Y-TZP ceramics for artificial joint replacements. Biomaterials, 19(16), 1489 - 1494. https://doi.org/10.1016/S0142-9612(98)00064-7