Changes in surface properties of dental alloys with atmospheric plasma irradiation

  • NAMURA Yasuhiro
    Department of Orthodontics, Nihon University School of Dentistry Division of Clinical Research, Dental Research Center, Nihon University School of Dentistry
  • UCHIDA Yasuki
    Department of Orthodontics, Nihon University School of Dentistry Division of Clinical Research, Dental Research Center, Nihon University School of Dentistry
  • SATO Ryoichi
    Department of Oral Structural and Functional Biology, Nihon University Graduate School of Dentistry
  • SHIMIZU Noriyoshi
    Department of Orthodontics, Nihon University School of Dentistry
  • MOTOYOSHI Mitsuru
    Department of Orthodontics, Nihon University School of Dentistry Division of Clinical Research, Dental Research Center, Nihon University School of Dentistry
  • TSUTSUMI Yusuke
    Research Center for Structural Materials, National Institute for Materials Science Department of Metallic Biomaterials, Institute of Biomaterials and Bioengineering, Tokyo Medical and Dental University
  • HANAWA Takao
    Department of Metallic Biomaterials, Institute of Biomaterials and Bioengineering, Tokyo Medical and Dental University
  • YONEYAMA Takayuki
    Department of Dental Materials, Nihon University School of Dentistry Division of Biomaterials Science, Dental Research Center, Nihon University School of Dentistry

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<p>Chemical transitions after atmospheric pressure plasma irradiation were investigated by evaluating intermolecular attractions and atomic and molecular reactions. Gold, titanium and stainless-steel alloy samples were ground with #800 grit SiC waterproof paper and nitrogen gas atmospheric plasma irradiation was conducted. The surface free energies of the treated alloys were calculated and compared statistically. X-ray photoelectron spectroscopy analysis was performed.The surface free energies of all metal surfaces treated by plasma irradiation were 1.5-times higher than those of the untreated metals. The energy of the hydrogen bonding component increased, and all alloy surfaces were coated with metal oxide after only a short period of plasma irradiation. The surfaces oxidized by plasma exhibited a high active energy, mainly due to an increase in the hydrogen bonding component. Reactions with oxygen in the air were promoted on the clean surfaces with exposed reactive elements.</p>

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