In vitro corrosion characteristics of commercially available orthodontic wires.
The corrosion characteristics of orthodontic alloy wires were investigated both in as-received and grinded conditions in 0.9% NaCl solution by atomic absorption spectrophotometry and potentiodynamic polarization measurements. The amount of each metal ion released from most alloys was larger for the grinded wires than for the as-received wires (p<0.01). The fact that the beta-Ti alloy wire (Ti-Mo-Zr) does not contain allergenic metals such as Ni, Co, and Cr, and the finding that resistance to both general and localized corrosion is the highest among the six wires investigated suggest that this wire is the most biocompatible orthodontic wire. Since a small amount of Ni, Cr or Co ions were released from Ni-Ti, Co-Cr and stainless steel wires, special attention should be paid during their clinical use for patients with allergic tendencies.
Department of Orthodontics, School of Dentistry, Health Sciences University of Hokkaido, Ishikari-tobetsu, Hokkaido, Japan.
Yasuyuki
Y
Yonekura
Kazuhiko
K
Endo
Masahiro
M
Iijima
Hiroki
H
Ohno
Itaru
I
Mizoguchi
D002858:Chromium Alloys; D003343:Corrosion; D003722:Dental Alloys / Q000737:chemistry*; D007101:Immersion; D008422:Materials Testing; D009532:Nickel; D009969:Orthodontic Wires; D011199:Potentiometry; D012965:Sodium Chloride; D013193:Stainless Steel; D014025:Titanium
D002858:Chromium Alloys; D003722:Dental Alloys; C023988:beta titanium; C040654:titanium nickelide; D013193:Stainless Steel; D012965:Sodium Chloride; D009532:Nickel; D014025:Titanium