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Surface Topology of Advanced Alumina/Zirconia Composite Femoral Head as Compared with Commercial Femoral Heads Made of Monolithic Zirconia
Author(s) -
Pezzotti Giuseppe,
Saito Takuma,
Takahashi Yasuhito,
Fukatsu Kyoju,
Sugano Nobuhiko
Publication year - 2011
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1551-2916.2010.04181.x
Subject(s) - cubic zirconia , materials science , composite material , surface roughness , yttria stabilized zirconia , surface finish , femoral head , composite number , ceramic , medicine , anatomy
Atomic force microscopy (AFM) has been systematically used to image the surface of a femoral head made of alumina/zirconia composite (henceforth referred to as zirconia‐toughened alumina, ZTA), in comparison with two types of commercially available femoral heads made of monolithic zirconia. AFM experiments were conducted before and after in vitro exposure in water moist environment. All materials contained zirconia partly stabilized with yttria. AFM observations were performed on wide areas of several heads of each type (i.e., in the order of several tens of μm 2 ), in order to ensure statistical reliability in the topologic measurements. Tetragonal‐to‐monoclinic phase transformation, which was quantitatively characterized by confocal Raman spectroscopy, showed significant difference among the investigated samples. Such differences were similarly found with respect to both roughness and time needed for topologic changes to occur. Variation of topologic statistic parameters, such as skewness and kurtosis of surface height histograms, confirmed the main impact of zirconia grain size on the environmental stability of the head surface, the finer the grain size the higher the stability.