In Vitro Corrosion Behavior of Lingual Orthodontic Archwires

Abstract

Objectives. To investigate the in vitro electrochemical corrosive behavior of archwires used in lingual orthodontics and the effects on the phase transition temperatures.Materials and Methods. Six different types of archwires of stainless steel, titanium-molybdenum, nickel-titanium and nickel-titanium-copper were used. Corrosion tests were performed following ISO-standard 10993-15:2000. Differential scanning calorimetry and scanning electron microscopy were used.Results. The stainless steel archwires showed anEpitaround −600 mV, and those of titanium alloys showedEpitvalues around 1000 mV. Differential scanning calorimetry detected a rhombohedral phase in nickel-titanium archwires, while it was not detected in nickel-titanium-copper wires. A difference of 2°C to 3.5°C from the manufacturer's claim was found in the as-received and polarized samples, respectively.Conclusions. The 0.016 stainless steel archwires were found to be the less resistant to corrosion. A rhombohedral phase was detected on the nickel-titanium archwires. No major differences were observed among groups concerning phase transformation temperatures.

Corrosion resistance of stainless steel, nickel-titanium, titanium molybdenum alloy, and ion-implanted titanium molybdenum alloy archwires in acidic fluoride-containing artificial saliva: An in vitro study

“…and Kim and Johnson. [ 2 15 ] They concluded that the titanium wires appear to be the most inert wire of those tested and are unlikely to release metal ions when used intraorally. They also stated that nitride coating did not affect the corrosion of the alloy.…”

Changes in mechanical properties of dental alloys induced by saliva and oral probiotic supplements

“…Although it has also been hypothesized that probiotic supplements have a bigger influence on stainless steel than on NiTi the opposite was found. Research to date has suggested that the occurrence of pitting corrosion and localised corrosion is more expressed in stainless steel than in NiTi alloy [36,37]. It is considered that titanium alloy, due to the formation of a passive TiO 2 film on the surface of the archwire, have a greater corrosion resistance than stainless steel, on which a passive Cr 2 O 3 film is formed [38].…”

The Effect of Mouthwashes on the Corrosion Resistance of Stainless Steel Wire

“…The use of prebrushing rinses, on the other hand, recently indicated no differences in impact on either gingival health or plaque accumulation (7). The surface changes such as discoloration and pitting are considered as main evident of corroding of the stainless steel wire (8)(9)(10)(11) . The current study was undertaken to assess the effect of both chlorhexidine and Listerine on the corrosion resistance of stainless steel wires.…”