title: Bioinertness and fracture toughness evaluation of the monoclinic zirconia surface film of Oxinium™ femoral head by Raman and cathodoluminescence spectroscopy.
abstract: Raman and cathodoluminescence spectroscopic methods were employed for clarifying important stoichiometric and mechanical properties so far missing in the specification of the physical origin of the structural behavior of Oxinium™ femoral head components. Spectroscopy proved helpful in rationalizing the actual physical and chemical reasons behind the mechanical integrity of the ceramic-film/metal-substrate interface, which is responsible for both the good adherence and the surface durability reported in prosthetic applications of Oxinium™ components. Raman spectroscopy coupled with the crack opening displacement (COD) method was used to evaluate the intrinsic fracture toughness of the surface oxide film. In addition, cathodoluminescence spectroscopy provided new evidences on both the oxygen vacancy gradient developed during the metal-oxidation manufacturing process and the bioinertness of Oxinium™ femoral components.
authors.affiliation: Piezotech Japan Ltd., Sakyo-ku, Ichijouji, Makaihata-cho 4, 606-8126 Kyoto, Japan.
authors.forename: Andrea
authors.initials: A
authors.lastname: Leto
authors.affiliation: Department of Orthopedic Surgery, Osaka University Medical School, 2-2 Yamadaoka, 565-0871 Suita, Japan.
authors.forename: Wenliang
authors.initials: W
authors.lastname: Zhu
authors.affiliation: Nissan Tamagawa Hospital, 4-8-1 Seta, Setagaya-ku, 158-0095 Tokyo, Japan.
authors.forename: Masaaki
authors.initials: M
authors.lastname: Matsubara
authors.affiliation: Kyoto Institute of Technology, Department of Materials Science and Engineering, Matsugasaki, Sakyo-ku, 603-8585 Kyoto, Japan. Electronic address: pezzotti@kit.ac.jp.
authors.forename: Giuseppe
authors.initials: G
authors.lastname: Pezzotti
mesh_terms: D001826:Body Fluids / Q000737:chemistry*; D020099:Coated Materials, Biocompatible / Q000737:chemistry*; D003343:Corrosion; D055119:Elastic Modulus; D004566:Electrodes; D019544:Equipment Failure Analysis / Q000379:methods; D005270:Femur Head / Q000601:surgery*; D006244:Hardness; D006245:Hardness Tests / Q000379:methods; D006622:Hip Prosthesis; D006801:Humans; D008163:Luminescent Measurements / Q000379:methods*; D008422:Materials Testing / Q000379:methods; D013059:Spectrum Analysis, Raman / Q000379:methods*; D013499:Surface Properties; D013718:Tensile Strength; D015040:Zirconium / Q000737:chemistry*
chemical_list: D020099:Coated Materials, Biocompatible; D015040:Zirconium; C028541:zirconium oxide
keywords: Fracture toughness; Monoclinic zirconia film; Oxinium™; Oxygen stoichiometry