5. Components for alumina-zirconia prostheses
The development of zirconia reached its limits due to –– problems of accelerated degradation. In response, new alumina-zirconia composites were developed (in the late 1990s). In this section, the main aspects of these composites - microstructure, mechanical properties and durability - are examined, and possible optimization paths are proposed.
The idea behind alumina-zirconia composites was to exploit the advantages of two materials: the hardness and chemical inertness of alumina, and the phase-transformation reinforcement of zirconia. The most common way of achieving this is to create a homogeneous dispersion of zirconia grains in an alumina matrix (this produces a material known as "ZTA" (Zirconia-Toughened Alumina ). A crack propagating in such a material causes the q-m transformation of the zirconia grains, and is therefore slowed down by the compressive stresses...
The Ultimate Scientific and Technical Reference
This article is included in
Glasses and ceramics
This offer includes:
Knowledge Base
Updated and enriched with articles validated by our scientific committees
Services
A set of exclusive tools to complement the resources
Practical Path
Operational and didactic, to guarantee the acquisition of transversal skills
Doc & Quiz
Interactive articles with quizzes, for constructive reading
Components for alumina-zirconia prostheses
The future of orthopedic bioceramics
Bibliography
Websites
Numbers of ceramic prostheses implanted http://www.ceramtec.com/ceramic-materials/biolox/delta/ , accessed May 27, 2014.
Standards and norms
- Implants for surgery – Ceramic materials based on yttria-stabilized tetragonal zirconia (Y-TZP) - ISO 13356 - 2008
- Surgical implants – Partial and total hip joint prostheses – Part 2: Joint surfaces made of metallic, ceramic and plastic materials - ISO 7206-2 - 2011
- Surgical implants – Ceramic products – Part 1: High-purity alumina-based ceramic products - ISO 6474-1 - 2010
- Surgical implants –...
Patents
Reinforced porous coating. EP1924301 A1
Coating for dental applications. WO2010145822 A1
Directory
Manufacturers of ceramics for orthopedics (non-exhaustive list)
Kyocera (Bioceram AZ209, Al190 ) http://kyocera-md.com/technology/material/index.html
Ceramtec (Biolox® Delta, Biolox® Forte ) http://www.ceramtec.com/
...Statistical and economic data
Haute Autorité de Santé. Revision of generic descriptions for the list of reimbursable products and services "hip joint replacements" 2007 http://www.has-sante.fr
Haute Autorité de Santé. Revision of generic descriptions on the list of reimbursable products and services: knee joint implants. 2012
The Ultimate Scientific and Technical Reference
