Papers by Author: Satoshi Nakamura

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Authors: Reiko Kato, Satoshi Nakamura, Keiichi Katayama, Kimihiro Yamashita
Authors: K. Yamana, M. Miyamoto, Satoshi Nakamura, K. Kihara
Authors: Shigeki Kishi, Norikazu Okimoto, Satoshi Nakamura, Keishi Nishio, Kazuaki Hashimoto, Yoshitomo Toda, Kimihiro Yamashita
Abstract: To produce ceramics with high mechanical strength and bioactivity, we developed the little amount of nano-sized hydroxyapatite (HA)-doped zirconia composite ceramics (nanoHA-Z). The bioactivity of the nanoHA-Z was studied by in vitro estimation with simulated body fluid (SBF). Scanning electron microscopy observation showed deposited bone-like apatite layer entire covering the surface of nanoHA-Z ceramics in SBF. The enhanced apatite formability was attributed to higher Ca and PO4 concentrations in the vicinities of the nanoHA-Z surfaces due to the dissolution of the β-tricalcium phosphate decomposed from the added HA. Utilization of Chemicovector effect was proved to be one of the powerful approaches for improvement method of biomaterials.
Authors: Satoshi Nakamura, M. Ueshima, Takayuki Kobayashi, Kimihiro Yamashita
Authors: H. Takeda, Satoshi Nakamura, Kazumasa Yamada, Toshio Tsuchiya, Kimihiro Yamashita
Authors: Emiko Amaoka, Erik Vedel, Satoshi Nakamura, Yusuke Moriyoshi, Jukka I. Salonen, Kimihiro Yamashita
Abstract: We investigated the electrical polarizability of MgO and B2O3 containing bioactive glass (MBG). The MBG material with good manufacturing properties but low bioactivity was electrically polarized at a high dc field. The electrical polarizability of MBG was evaluated by thermally stimulated depolarization current (TSDC) measurements and immersion in simulated body fluid (SBF). The early precipitation of calcium phosphate on the negatively charged surface of the treated MBG demonstrated the increased bioactivity of the material and confirmed its polarizability. It is suggested that the electrical interactions between the polarized MBG and ions in SBF promoted the formation of the calcium phosphate precipitation. Accordingly, the increased bioactivity of the MBG in SBF is suggested to demonstrate the conversion of MBG into electrovector ceramics by the polarization treatment.
Authors: Y. Ushigami, Satoshi Nakamura, S. Takebayashi, Shinya Suzuki
Authors: Ken-ichi Yamada, Satoshi Nakamura, Toshio Tsuchiya, Kimihiro Yamashita
Authors: W.E. Carlos, E.R. Glaser, T.A. Kennedy, Satoshi Nakamura
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