Galvanic corrosion behavior of orthodontic archwire alloys coupled to bracket alloys

Masahiro Iijima, Kazuhiko Endo, Toshihiro Yuasa, Hiroki Ohno, Kazuo Hayashi, Mitsugi Kakizaki, Itaru Mizoguchi

Research output: Contribution to journalArticlepeer-review

20 Citations (Scopus)

Abstract

The purpose of this study was to provide a quantitative assessment of galvanic corrosion behavior of orthodontic archwire alloys coupled to orthodontic bracket alloys in 0.9% NaCl solution and to study the effect of surface area ratios. Two common bracket alloys, stainless steels and titanium, and four common wire alloys, nickel-titanium (NiTi) alloy, β-titanium (β-Ti) alloy, stainless steel, and cobalt-chromium-nickel alloy, were used. Three different area ratios, 1:1, 1:2.35, and 1:3.64, were used; two of them assumed that the multibracket appliances consists of 14 brackets and 0.016 inch of round archwire or 0.016 x 0.022 inch of rectangular archwire. The galvanic current was measured for 3 successive days using zero-impedance ammeter. When the NiTi alloy was coupled with Ti (1:1, 1:2.35, and 1:3.64 of the surface area ratio) or β-Ti alloy was coupled with Ti (1:2.35 and 1:3.64 of the surface area ratio), Ti initially was the anode and corroded. However, the polarity reversed in 1 hour, resulting in corrosion of the NiTi or β-Ti. The NiTi alloy coupled with SUS 304 or Ti exhibited a relatively large galvanic current density even after 72 hours. It is suggested that coupling SUS 304-NiTi and Ti-NiTi may remarkably accelerate the corrosion of NiTi alloy, which serves as the anode. The different anode-cathode area ratios used in this study had little effect on galvanic corrosion behavior.

Original languageEnglish
Pages (from-to)705-711
Number of pages7
JournalAngle Orthodontist
Volume76
Issue number4
Publication statusPublished - 2006 Jul 21
Externally publishedYes

Keywords

  • Archwire
  • Bracket
  • Galvanic corrosion

ASJC Scopus subject areas

  • Orthodontics

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