Advanced materials for joint implants by Giuseppe Pezzotti

By Giuseppe Pezzotti

Based on an interdisciplinary method that at once bridges orthopedic options to floor technological know-how, this e-book info state of the art examine in bioceramics technological know-how, actual chemistry, biomedical optics, and nanomechanics. The ebook cites a number of the extra traditional spectroscopic characterization techniques—including Raman and cathodoluminescence spectroscopy. those recommendations were used to unveil molecular scale phenomena of either chemical and mechanical foundation taking place on the sliding surfaces of bioceramic joints. those ideas are of serious value to researchers as they're appropriate to the improvement of latest biomaterials.

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In vivo, a combination of hydrothermal and mechanical exposure may selectively trigger detrimental changes on the surface of femoral heads that have inferior phase stability [56, 57]. Transformation from the tetragonal to the monoclinic phase may be influenced by the effect of body fluid and impingement conditions. Since hydrothermal processes are the most salient to material stability, the implant can be very sensitive to the adopted lubrication mode; 19 20 General Introduction for example, for zirconia ceramic-on-ceramic bearing systems tested in a hip simulator, early catastrophic failure was found when run in water but implants survived as long as 20 million cycles when run with calf serum lubrication [58].

A subchapter is also dedicated to methods of surface tribology characterization [150, 151] updated with the use of in situ laser spectroscopy in a specially designed tribometer. These latter two characterization methods are important because they provide direct outputs about the intrinsic structural resistance of joint biomaterials when loaded under extreme environmental conditions. 2 Atomic Force Microscopy The AFM device can be considered a modern and highly technological update of the more traditional stylus profilometer.

1 per 11,000 units). 002%. In January 1998, a crucial change was made to the manufacturing process with the introduction of a “tunnel” furnace in order “to optimize” the production process. After thorough consultations, the expert study group concluded that the combination of the tunnel-sintering and subsequent machining operations had probably negatively interacted to make the femoral heads extremely vulnerable to transformation into monoclinic phase in patients. Clarke et al. [55] noticed that since their inception 18 years ago, the performance of zirconia ceramic balls has been both confusing and controversial.

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