title: Application of plasma immersion ion implantation for surface modification of nickel-titanium rotary instruments.
abstract: By means of X-ray photoelectron spectroscopy (XPS) and differential scanning calorimetry (DSC), this study set out to investigate the application of plasma immersion ion implantation (PIII) for the surface modification of ProTaper NiTi rotary instruments. This study was undertaken because the PIII method was perceived to have the potential of developing into a standard surface modification technique that improves clinical quality and outcome. Specimens received nitrogen ion or nitrogen plus argon ion implantation. XPS analyses with and without argon ion etching were obtained for all specimens. In addition, DSC analysis was performed to investigate the phase transformation behavior of the bulk material. Results indicated that the surfaces of NiTi instruments were successfully modified by nitrogen PIII, whereby a light golden TiN layer was yielded. Moreover, the PIII technique did not alter the superelastic character of NiTi instruments because it was carried out at near-room temperature. We thus concluded that nitrogen PIII is a promising surface modification technique to improve the surface characteristics of NiTi rotary instruments.
authors: School of Dentistry and Graduate Institute of Clinical Dentistry, College of Medicine, National Taiwan University and National Taiwan University Hospital, Taipei 10016, Taiwan, ROC.
authors: Uei-Ming
authors: UM
authors: Li
authors: Masahiro
authors: M
authors: Iijima
authors: Kazuhiko
authors: K
authors: Endo
authors: William A
authors: WA
authors: Brantley
authors: Satish B
authors: SB
authors: Alapati
authors: Chun-Pin
authors: CP
authors: Lin
mesh_terms: D001128:Argon; D001672:Biocompatible Materials / Q000737:chemistry*; D002152:Calorimetry, Differential Scanning / Q000379:methods; D006358:Hot Temperature; D009532:Nickel / Q000737:chemistry*; D018915:Root Canal Preparation / Q000295:instrumentation*; D012399:Rotation; D013052:Spectrometry, X-Ray Emission / Q000379:methods; D013499:Surface Properties; D014025:Titanium / Q000737:chemistry*
chemical_list: D001672:Biocompatible Materials; C040654:titanium nickelide; D001128:Argon; D009532:Nickel; D014025:Titanium