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. 2015 Jan;12(1):49-59.

Effect of fluoride on nickel-titanium and stainless steel orthodontic archwires: an in-vitro study

Farzin Heravi  1 , Mohamad Hadi Moayed  2 , Nima Mokhber  3
Affiliations

Effect of fluoride on nickel-titanium and stainless steel orthodontic archwires: an in-vitro study

Farzin Heravi et al. J Dent (Tehran). 2015 Jan.

Abstract

Objectives: The commonly used Nickel-Titanium (NiTi) archwires in orthodontic treatment are often exposed to fluoride-containing mouthwashes. The aim of this in-vitro study was to evaluate and compare the corrosion resistance of three commercially available NiTi archwires exposed to 0.05 wt% and 0.2 wt% fluoride mouthwashes.

Materials and methods: Three different types of NiTi archwires, 0.016″ in diameter, from Dentaurum, Global, and GAC, and a stainless steel archwire from Dentaurum were examined to assess their corrosion resistance in Fusayama-Meyer artificial saliva and in two other artificial saliva containing 0.05 wt% and 0.2 wt% sodium fluoride (NaF). After the primary setup of wires, they were tested by potentiodynamic and potentiostatic polarization and corrosion potential/time analyses. Their surfaces were evaluated using a scanning electronic microscope (SEM).

Results: The results showed that all the wires were passive in artificial saliva. In contrast, by adding fluoride ions to the solution, the decrease in the archwires' corrosion resistance was in direct proportion to the increase in fluoride concentration.

Conclusion: The NiTi wires experienced deterioration of their corrosion properties under the effect of fluoride but not as much as the stainless steel archwires.

Keywords: Corrosion; Fluoride; Nickel-titanium alloy; Scanning electron microscopy.

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Figures

Fig 1
Fig 1
Depicting various parameters in a polarization plot
Fig 2
Fig 2
Comparison of NiTi archwires’ polarization plots in artificial saliva
Fig 3
Fig 3
Potentiodynamic polarization plot for stainless steel and NiTi-3 (Global) archwires in artificial saliva
Fig 4
Fig 4
Comparison of NiTi archwires’ potentiiostatic plots in artificial saliva
Fig 5
Fig 5
Comparison of NiTI archwires’ corrosion potential over time in artificial saliva
Fig 6
Fig 6
Comparison of NiTi archwires’ polarization plots in artificial saliva with 0.05wt% NaF
Fig 7
Fig 7
Comparison of NiTi archwires’ polarization plots in artificial saliva with 0.2wt% NaF
Fig 8
Fig 8
SEM images of pitting corrosion in a)Dentaurum NiTi-1 archwires b)GAC NiTi-2 archwires c)Global NiTi-3 archwires d)Dentaurum stainless steel archwires
See this image and copyright information in PMC

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