Changes in surface properties of dental alloys with atmospheric plasma irradiation

Yasuhiro Namura, Yasuki Uchida, Ryoichi Sato, Noriyoshi Shimizu, Mitsuru Motoyoshi, Yusuke Tsutsumi, Takao Hanawa, Takayuki Yoneyama

Research output: Contribution to journalArticlepeer-review


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.

Original languageEnglish
Pages (from-to)375-380
Number of pages6
JournalDental Materials Journal
Issue number3
Publication statusPublished - 2020


  • Dental alloys
  • Hydrogen bonding
  • Oxides
  • Photoelectron spectroscopy
  • Plasma gases


Dive into the research topics of 'Changes in surface properties of dental alloys with atmospheric plasma irradiation'. Together they form a unique fingerprint.

Cite this