Biocompatibility and water durability of alumina-zirconia ceramics blended with microsized HA particles
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概要
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To improve the bioactivity of alumina containing yttria stabilized zirconia (Al-YSZ), composite ceramics consisting of Al-YSZ and 0–10 wt % of hydroxyapatite (HA) were prepared. The XRD patterns of sintered disks with an HA content above 3 wt % had monoclinic and cubic YSZ phases and a β-tricalcium phosphate phase. Although the Vickers hardness decreased as the HA content increased, all the prepared ceramics had the same or greater hardness (1000–1300 Hv with a load of 0.49 N) compared to typical YSZ ceramics (900–1000 Hv) commonly used in clinics. Furthermore, the bonelike apatite formation ability in simulated body fluid, which was examined as a screening of bioactivity, suggested that all the surfaces of Al-YSZ ceramics blending with a small amount of HA may possess the ability to connect bone. After the accelerated low temperature degradation (LTD) test performed in normal saline at 120°C for five days using composite ceramics with the HA content of 0, 1, 3, and 10 wt %, the tetragonal zirconia phase of all composite ceramics were partially transformed into the monoclinic phase with a transition ratio of ca. 16–18 mol % (for HA = 0 and 10 wt %) and ca. 4–5 mol % (for HA = 1 and 3 wt %). Blending microsized HA powder in Al-YSZ ceramics has both positive and negative effects on the LTD durability of Al-YSZ ceramics. An advantage is that calcium ion substitution in YSZ seems to stabilize the tetragonal (or cubic) zirconia phases, but the increased surface area exposed to the solution is a disadvantage.
- 公益社団法人 日本セラミックス協会の論文
著者
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YOSHIDA Masato
Department of Microbiology, Kitasato University School of Medicine
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Hashimoto Kazuaki
Department of Cardiovascular Medicine, Gifu Municipal Hospital
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Tanaka Yumi
Institute Of Biomaterials And Bioengineering Department Of Inorganic Materials Tokyo Medical And Den
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TODA Yoshitomo
Department of Life and Environmental Sciences, Faculty of Engineering, Chiba Institute of Technology
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Yoshida Masato
Department Of Cardiovascular Surgery Hyogo Brain And Heart Center At Himeji
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NAKAMURA Miho
Department of Cardiology, Kitasato Institute Hospital, Kitasato University
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YAMASHITA Kimihiro
Department of Pharmacology, Nagasaki University School of Medicine
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Tanaka Yumi
Department of Inorganic Materials, Institute of Biomaterials and Bioengineering, Tokyo Medical and D
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NAGAI Akiko
Department of Inorganic Materials, Institute of Biomaterials and Bioengineering, Tokyo Medical and D
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Nagai Akiko
Department Of Anatomy Nihon University School Of Dentistry At Matsudo
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Yamashita Kimihiro
Department Of Developmental Genetics (h2) Graduate School Of Medicine Chiba University
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Hashimoto Kazuaki
Department Of Cardiovascular Medicine Gifu Municipal Hospital
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Nakamura Miho
Department Of Cardiology Kitasato Institute Hospital Kitasato University
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TANAKA Yumi
Department of Applied Chemistry, Faculty of Engineering, Kyushu University
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NAGAI Akiko
Department of Inorganic Materials, Institute of Biomaterials and Bioengineering, Tokyo Medical and Dental University
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TANAKA Yumi
Department of Inorganic Materials, Institute of Biomaterials and Bioengineering, Tokyo Medical and Dental University
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TODA Yoshitomo
Department of Industrial Chemistry, Chiba Institute of Technology
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NAKAMURA Miho
Department of Anesthesiology, Tohoku University School of Medicine
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