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In vitro surface corrosion of stainless steel and NiTi orthodontic appliances

Authors
 Shin JS  ;  Oh KT  ;  Hwang CJ 
Citation
 AUSTRALIAN ORTHODONTIC JOURNAL, Vol.19(1) : 13-18, 2003 
Journal Title
 AUSTRALIAN ORTHODONTIC JOURNAL 
ISSN
 0587-3908 
Issue Date
2003
MeSH
Color ; Corrosion ; Dental Alloys/chemistry* ; Equipment Failure ; Hot Temperature ; Humans ; Immersion ; Materials Testing ; Microscopy, Electron, Scanning ; Nickel/chemistry* ; Orthodontic Brackets* ; Orthodontic Wires* ; Oxides/chemistry ; Saliva, Artificial/chemistry ; Spectrophotometry ; Stainless Steel/chemistry* ; Surface Properties ; Time Factors ; Titanium/chemistry* ; X-Ray Diffraction
Keywords
12790351
Abstract
Simulated fixed orthodontic appliances were constructed, immersed and incubated in artificial saliva for periods up to three months. Two types of stainless steel archwires and two types of NiTi wires were used. The surface corrosion of the archwires was determined macroscopically, with scanning electron microscopy, and with spectrophotometry. The deposits on the wires were identified with X-ray diffraction. Uniform corrosion was observed on stainless steel wires, and a slight colour change was detected on the NiTi wires beneath stainless steel ligatures. The corrosion product on the stainless steel wires increased with immersion time, and the surface oxide films were easily detached from the underlying matrix. Crevice corrosion was observed under deposits of oxide, and at the interface between bracket and band. Such corrosion may weaken a wire or weld leading to fracture. In contrast, the NiTi archwires did not corrode, and there was no significant difference in surface morphology. The stainless steel archwires showed a significant loss of reflectance after heat treatment and immersion in artificial saliva. The NiTi archwires had the same reflectance before and after the immersion test. NiTi archwires are significantly more stable and resistant to corrosion than stainless steel archwires
DOI
OAK-2003-01243
Appears in Collections:
2. College of Dentistry (치과대학) > Dept. of Orthodontics (교정과학교실) > 1. Journal Papers
Yonsei Authors
Hwang, Chung Ju(황충주) ORCID logo https://orcid.org/0000-0003-3024-4551
URI
https://ir.ymlib.yonsei.ac.kr/handle/22282913/114403
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