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Nano-scale topography of bearing surface in advanced alumina/zirconia hip joint before and after severe exposure in water vapor environmen (Articolo in rivista)

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Nano-scale topography of bearing surface in advanced alumina/zirconia hip joint before and after severe exposure in water vapor environmen (Articolo in rivista) (literal)

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G. Pezzotti (1); T. Saito (1); G. Padeletti (2); P. Cossari (2); K. Yamamoto (3); (2010)
Nano-scale topography of bearing surface in advanced alumina/zirconia hip joint before and after severe exposure in water vapor environmen
in Journal of orthopaedic research; Raven Press, New York (Stati Uniti d'America)
(literal)

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G. Pezzotti (1); T. Saito (1); G. Padeletti (2); P. Cossari (2); K. Yamamoto (3); (literal)

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1) Ceramic Physics Laboratory and Research Institute for Nanoscience, Kyoto Institute of Technology, Sakyo-ku, Matsugasaki, 606-8585 Kyoto, Japan 2) National Research Council, ISMN, CP 10, Monterotondo Stazione, 00016 Rome, Italy, 3 Department of Orthopedic Surgery, Tokyo Medical University, 6-7-1 Nishi-shinjuku, Shinjuku-ku, 160-0023 Tokyo, Japan (literal)

Titolo

Nano-scale topography of bearing surface in advanced alumina/zirconia hip joint before and after severe exposure in water vapor environmen (literal)

Abstract

The aim of this study was to perform a surface morphology assessment with nanometer scale resolution on femoral heads made of an advanced zirconia toughened alumina (ZTA) composite. Femoral heads were characterized to a degree of statistical accuracy in the as-received state and after exposures up to 100 h in severe vapor-moist environment. Surface screening was made using an atomic force microscope (AFM). Scanning was systematically repeated on portions of surface as large as several tens of micrometers, randomly selected on the head surface, to achieve sufficient statistical reliability without lowering the nanometer-scale spatial resolution of the roughness measurement. No significant difference was found in the recorded values of surface roughness after environmental exposure (at 134 degrees C, under 2 bar), which was always comparable to that of the as-received head. Surface roughness safely lay <10 nm after environmental exposures up to 100 h, which corresponded to an exposure time in vivo of several human lifetimes (i.e., according to an experimentally derived thermal activation energy). In addition, the roughness results were significantly (about one order of magnitude) lower as compared to those recorded on femoral heads made of monolithic zirconia tested under the same conditions. (C) 2010 Orthopaedic Research Society. Published by Wiley Periodicals, Inc. J Orthop Res 28:762-766, 2010 (literal)

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