Hydrogen embrittlement of work-hardened Ni–Ti alloy in fluoride solutions

Yokoyama, K.; Kaneko, Kazuyuki; Ogawa, Takeshi; Moriyama, Keiji; Asaoka, Kenzo; Sakai, Jun–ichi

doi:10.1016/j.biomaterials.2004.02.009

Cited by 71 publications

(43 citation statements)

References 45 publications

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“…Recently, the corrosion behavior of nickel-titanium orthodontic wire has been widely studied with regard to the effects of a fluorinecontaining environment [13][14][15] , various temperatures 19) , bending stress 20) and galvanic corrosion 4,21,22) . It is well known that nickel-titanium orthodontic wire has high corrosion resistance due to a protective TiO2 film formed on the top surface 23,24) .…”

Section: Discussionmentioning

confidence: 99%

“…The fluoride level in the oral environment varies according to the prophylactic treatment used. Although titanium alloys show excellent corrosion resistance due to the highly protective TiO2 oxide film on the top surface 23) , numerous reports have shown that the corrosion resistance of titanium alloys decreased in the presence of fluoride ions [13][14][15] . In an acidic environment, fluoride ions form hydrofluoric acid (HF), and a HF concentration of over 30 ppm resulted in dissolution of the passive film of titanium alloys 6) .…”

Section: Discussionmentioning

confidence: 99%

“…Jia et al 12) reported that nitrogen-implanted nickel-titanium wires released significantly fewer nickel ions in artificial saliva than conventional nickel-titanium wires. However, there has been no study on the corrosion properties of ion implanted nickel-titanium wire in a fluorine-containing environment, even though previous reports have revealed [13][14][15] that the corrosion resistance of orthodontic titanium and nickel-titanium alloy was decreased in such an environment.…”

Section: Introductionmentioning

confidence: 99%

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Corrosion behavior of ion implanted nickel-titanium orthodontic wire in fluoride mouth rinse solutions

et al. 2010

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This study investigated the corrosion properties of ion implanted nickel-titanium wire (Neo Sentalloy Ionguard) in artificial saliva and fluoride mouth rinse solutions (Butler F Mouthrinse, Ora-Bliss). Non ion implanted nickel-titanium wire (Neo Sentalloy) was used as control. The anodic corrosion behavior was examined by potentiodynamic polarization measurement. The surfaces of the specimens were examined with SEM. The elemental depth profiles were characterized by XPS. Neo Sentalloy Ionguard in artificial saliva and Butler F Mouthrinse (500 ppm) had a lower current density than Neo Sentalloy. In addition, breakdown potential of Neo Sentalloy Ionguard in Ora-Bliss (900 ppm) was much higher than that of Neo Sentalloy although both wires had similar corrosion potential in Ora-Bliss (450 and 900 ppm). The XPS results for Neo Sentalloy Ionguard suggested that the layers consisted of TiO2 and TiN were present on the surface and the layers may improve the corrosion properties.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Corrosion behavior of ion implanted nickel-titanium orthodontic wire in fluoride mouth rinse solutions

et al. 2010

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“…Yokoyama et al 14 in their study explained the reason for the ductility loss and the reduction in the tensile strength of the workhardened NiTi alloy in 2.0% APF solution. They suggested that there is a formation of a brittle layer at the peripheral part of the cross-section which is associated with rapid absorption of hydrogen.…”

Section: Discussionmentioning

confidence: 99%

Evaluation of the Effects of Fluoride Prophylactic Agents on Mechanical Properties of Nickel Titanium Wires using Scanning Electron Microscope

Gupta¹,

Shukla²,

Sharma

et al. 2018

The Journal of Contemporary Dental Practice

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Introduction Orthodontic treatment these days is increasing in demand, and therefore, it is relatively imperative for the orthodontist to prescribe the use of fluoride-containing products, such as mouthwashes and gels, to help prevent dental caries and maintain healthy oral health. The aim of the study was to assess and evaluate the effects of fluoride prophylactic agents on mechanical properties of nickel titanium (NiTi) wires during orthodontic treatment using scanning electron microscope (SEM). Materials and methods We used the commercially available round preformed NiTi orthodontic archwire (3M company) and three different mouthwash solutions, i.e., Phos-Flur gel (1.1% sodium acidulated phosphate fluoride, APF, 0.5% w/v fluoride, pH = 5.1; Colgate Oral Pharmaceuticals) and Prevident 5000 (1.1% sodium fluoride neutral agent, 0.5% w/v fluoride, pH = 7; Colgate Oral Pharmaceuticals). All the specimens were subjected to a three-point bending test on a universal testing machine. To observe the surface morphological changes, one wire from each group was randomly selected and observed under a SEM. Results It was observed that there was not much difference in the values of both modulus of elasticity and yield strength obtained after loading of stress on the wires in all the three experimental conditions. A significant difference in both modulus of elasticity and yield strength was observed during unloading of stress. Further, when the surface characteristics were observed for all the specimens using SEM images, it was observed that NiTi wires treated with Phos-Flur showed large surface defects which appeared as round, pitted areas depicting corrosion, numerous white inclusions, and overall damaged surface structure of the wire as compared with the control. Conclusion Thus, fluoridated mouthwashes are essential to maintain good oral hygiene and decrease instance of caries in patients undergoing orthodontic treatment. The prophylactic usage of topical fluoride agents on NiTi wire seems to diminish the mechanical properties of the orthodontic wire that could significantly affect future treatment outcomes. Clinical significance It has been proved that fluoride mouthwashes/gels do affect the structural surface qualities and strength of wires used during the orthodontic treatment irrespective of the composition of the wires. Therefore, it is the responsibility of the clinician to prescribe these prophylactic agents carefully while keeping in mind their pH so that the overall result of the treatment may not be hampered and delayed due to change in properties of the wires used. How to cite this article Gupta AK, Shukla G, Sharma P, Gupta AK, Kumar A, Gupta D. Evaluation of the Effects of Fluoride Prophylactic Agents on Mechanical Properties of Nickel Titanium Wires using Scanning Electron Microscope. J Contemp Dent Pract 2018;19(3):283-286.

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“…6 Corrosion of orthodontic appliances has been thoroughly studied. [7][8][9][10][11][12] There are several consequences of corrosion in orthodontics.…”

Section: Use Of Gold In Dentistrymentioning

confidence: 99%

A Combinatorial Approach to Corrosion Inhibition of Alloy

2017

IJDA

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Hydrogen embrittlement of work-hardened Ni–Ti alloy in fluoride solutions

Cited by 71 publications

References 45 publications

Corrosion behavior of ion implanted nickel-titanium orthodontic wire in fluoride mouth rinse solutions

Corrosion behavior of ion implanted nickel-titanium orthodontic wire in fluoride mouth rinse solutions

Evaluation of the Effects of Fluoride Prophylactic Agents on Mechanical Properties of Nickel Titanium Wires using Scanning Electron Microscope

A Combinatorial Approach to Corrosion Inhibition of Alloy

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