Next Article in Journal
Bioactivity Behavior Evaluation of PCL-Chitosan-Nanobaghdadite Coating on AZ91 Magnesium Alloy in Simulated Body Fluid
Previous Article in Journal
Study of the Durability and Aesthetical Properties of Powder Coatings Admixed with Pearlescent Pigments
Open AccessArticle

Tribocorrosive Study of New and In Vivo Exposed Nickel Titanium and Stainless Steel Orthodontic Archwires

1
Slovenian National Building and Civil Engineering Institute, Dimičeva 12, 1000 Ljubljana, Slovenia
2
Medical Faculty, University of Ljubljana, Vrazov trg 2, 1000 Ljubljana, Slovenia
3
Institute for Metals and Technology, Lepi pot 11, 1000 Ljubljana, Slovenia
4
Research Institute, University of Dayton, 300 College Park, Dayton, OH 45469, USA
*
Author to whom correspondence should be addressed.
Coatings 2020, 10(3), 230; https://doi.org/10.3390/coatings10030230
Received: 6 February 2020 / Revised: 28 February 2020 / Accepted: 29 February 2020 / Published: 3 March 2020
(This article belongs to the Section Surface Coatings for Biomedicine and Bioengineering)
The surface, corrosion and wear properties of new and in vivo exposed nickel titanium (NiTi) and stainless steel (SS) archwires used in orthodontic treatment were investigated. Electrochemical and tribo-electrochemical tests in artificial saliva were performed in order to define corrosion properties and to estimate wear rate of new and in vivo exposed NiTi and SS archwires. The surface chemical analysis of the passive film on the NiTi and SS archwires before and after tribocorrosion tests was performed by Auger Electron Spectroscopy (AES). In vivo exposed NiTi and SS archwires had better electrochemical properties than new archwires due to the protective nature of oral deposits. Total wear and coefficients of friction were higher among in vivo exposed archwires and higher in NiTi archwires in comparison to SS archwires. The estimated thickness of the TiO2 passive film on as-received NiTi is 8 nm, while the passive Cr2O3 film on as-received SS is just 1–2 nm. On in vivo exposed NiTi archwire, a 60–80 nm thick organic film/dental plaque was observed, and on SS, it was thinner, at about 60 nm. This research shows the importance of combining AES with electrochemical testing, to characterize tribocorrosive properties of NiTi and SS orthodontic archwires. View Full-Text
Keywords: NiTi; stainless steel; dental alloy; corrosion; tribocorrosion; surface properties; Auger Electron Spectroscopy NiTi; stainless steel; dental alloy; corrosion; tribocorrosion; surface properties; Auger Electron Spectroscopy
Show Figures

Graphical abstract

MDPI and ACS Style

Kosec, T.; Močnik, P.; Mezeg, U.; Legat, A.; Ovsenik, M.; Jenko, M.; Grant, J.T.; Primožič, J. Tribocorrosive Study of New and In Vivo Exposed Nickel Titanium and Stainless Steel Orthodontic Archwires. Coatings 2020, 10, 230.

Show more citation formats Show less citations formats
Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Article Access Map by Country/Region

1
Back to TopTop