2009 Fiscal Year Final Research Report

Nanostructure surface modification of the orthodontic appliance by a plasma immersion ion implantation

Research Project

Project/Area Number	19592363
Research Category	Grant-in-Aid for Scientific Research (C)
Allocation Type	Single-year Grants
Section	一般
Research Field	Orthodontic/Pediatric dentistry
Research Institution	Health Sciences University of Hokkaido
Principal Investigator	IIJIMA Masahiro Health Sciences University of Hokkaido, 歯学部, 准教授 (20305915)
Co-Investigator(Kenkyū-buntansha)	MIZOGUCHI Itaru 北海道医療大学, 歯学部, 教授 (20200032)
Research Collaborator	BRANTLEY William A. Ohio State University LIN Chun-pin National Taiwan University
Project Period (FY)	2007 – 2009
Keywords	イオン注入 / 矯正装置 / 耐食性
Research Abstract	The purposes of this study were to investigate the corrosion properties and the surface structure of ion implanted nickel-titanium orthodontic wire. Ion implanted nickel-titanium wire and Non ion implanted nickel-titanium wire were used for a potentiodynamic polarization measurement and X-ray photoelectron spectroscopy (XPS). Ion implanted wire in artificial saliva and mouthrinse with neutral pH had a lower current density than non ion implanted wire. Both wires in mouthrinse with low pH showed similar corrosion properties. XPS results suggested that a TiN layer may be present on the top surface. Plasma immersion ion implantation might increase the corrosion resistance of nickel-titanium wire in a neutral environment because of a protective TiN layer on the top surface.

(2 results)