The electrochemical behavior and surface analysis of Ti50Ni47.2Co2.8 alloy for orthodontic use

Wang, Qingyu; Zheng, Yufeng

doi:10.1016/j.dental.2008.01.011

Cited by 30 publications

(17 citation statements)

References 4 publications

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“…It can thus be inferred that the increase in the release rate is related to the partial dissolution of the outer layer on the nickel-titanium surfaces. The increased concentration of Ni ions detected in PBS+BSA indicates that Ni leaching from nitinol surface takes place even when no visual corrosion signs occurred; this selective leaching of nickel from nickeltitanium surface causes a denickelification of the alloy, in accordance with the observations of Wang and Zheng [35], this process releases nickel ions. Nickel released from the bulk material into the solution reduces the local concentration of nickel in the materials.…”

Section: 3supporting

confidence: 83%

“…This implies the good blocking behaviour of nitinol under these conditions and it is related to the rapid formation of an oxide film, mainly attributed to TiO 2 [33,34]. As observed by Wang and Zheng [35], a nickel deficiency may be caused on the surface of the passivated nitinol, and nickel may diffuse into the sublayer or be released into the electrolyte. The latter will be assessed later as we will see from the Ni ion release experiments.…”

Section: Charge-transfer Resistance R Ctmentioning

confidence: 62%

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Electrochemical Characterisation of Bovine Serum Albumin Adsorption on Phenolic- Coated Nickel-Titanium

Chatzitakis¹,

Longela²

2019

JESTR

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Understanding molecular interactions at the solid-liquid interface is essential to the development of biomaterials intended to function in the physiologic environment. Superelastic nickel-titanium, widely used for biomaterials applications, is here coated with two different phenolic compounds: pyrogallol and tannic acid. The adsorption of bovine serum albumin protein on these phenolic-coated surfaces is assessed by electrochemical impedance spectroscopy and cyclic voltammetry to understand the behavioural kinetics of proteins in a physiological environment. Using an electrical equivalent model, we show that pyrogallol coated surfaces adsorb more proteins than the native and the tannic acid-treated surfaces. We also show that in all cases, the amount of nickel ions leaching from the biomterial falls well withing the acceptable range for biocompatibility.

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Section: 3supporting

confidence: 83%

Section: Charge-transfer Resistance R Ctmentioning

confidence: 62%

Electrochemical Characterisation of Bovine Serum Albumin Adsorption on Phenolic- Coated Nickel-Titanium

Chatzitakis¹,

Longela²

2019

JESTR

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“…This results in the formation of the titanium dioxide layer on the outermost layer, which is deficient in nickel. Nickel may diffuse into the sublayer or be released into the electrolyte as observed by Wang and Zheng [26].…”

Section: Discussionmentioning

confidence: 99%

In vitro corrosion behaviour of phenolic coated nickel–titanium surfaces

Longela¹,

Chatzitakis²

2020

Biosurface and Biotribology

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The biocompatibility of implantable nickel-titanium biomaterials relies on the quality of their surfaces. In this study, nickel-titanium surfaces are coated with phenolic thin films of tannic acid and pyrogallol with the purpose of studying their corrosion resistance in physiological environments. Three tests are performed: the open-circuit potential test, potentiodynamic polarisation and potentiostatic electrochemical impedance spectroscopy. Polarisation measurements are scrutinised in order to gain knowledge concerning the kinetics of the cathodic and anodic reactions, while the open-circuit potentials and impedance spectroscopy help to study the electrolyte-surficial interactions. It is found that coating nitinol with polyphenols results in the depletion of the native oxide layer and thus a decrease of corrosion resistance. Pyrogallic treated nitinol surfaces (with a corrosion rate of 0.119 mm/year) are half as electrochemically corrosion resistive as tannic acid-coated substrate. Therefore, it is proposed that tannic treated nitinol would be a better option if implanted on biomaterial surfaces. † first, in 70% vol. ethanol; † second, for 5 min at 40°C in an ultrasonic bath with deionised water Milli-Q Direct (Millipore, Billerica, MA) with a resistivity of 18.2 MΩ cm at 25°C; † third, in 40% NaOH and water bath for 5 min; † fourth, sonicated in deionised water for 5 min with a subsequent rinse with deionised water for 5 min; † fifth, immersed for 10 min in 50% vol. HNO 3 , then sonicated in deionised water for 5 min, and then rinsed in deionised water until reaching a neutral pH, and finally, stored in 70% vol. ethanol. 2.1 Polyphenolic coatings Samples were either treated with pyrogallol (PG) diluted in 100 mM BisTris buffer pH 7.0 with 100 mM magnesium chloride at a concentration of 1 mg ml −1 or with tannic acid (TA) diluted in Biosurface and Biotribology

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“…After polishing, the samples were successively cleaned with acetone, alcohol, and deionized water in an ultrasonic bath. Drying was done in a stream of warm dry air 25) .…”

Section: Co-cr Alloy Sample Preparationmentioning

confidence: 99%

Effect of (−)-epigallocatechin gallate on electrochemical behavior and surface film composition of Co-Cr alloy used in dental restorations

Qiao

2012

Dent. Mater. J.

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The aim of this study was to investigate the electrochemical behavior of Co-Cr alloy in artifi cial saliva containing (−)-epigallocatechin gallate (EGCG) and to characterize the composition and structure of the passive fi lm formed by potentiodynamic polarization. Electrochemical measurements ranked the corrosion resistance of Co-Cr dental cast alloy as follows when exposed to artifi cial saliva containing different concentrations of EGCG: 4.0 g/L<2.0 g/L<0 g/L<0.5 g/L<1.0 g/L. This showed that the concentration of EGCG in artifi cial saliva affected the corrosion behavior of Co-Cr alloy. X-ray photoelectron spectroscopy (XPS) results revealed that the outermost surface layer on Co-Cr alloy was mainly composed of Cr 2 O 3 and EGCG-Cr (III) ion complex, which were formed by redox and complex formation reactions respectively. When the redox reaction was dominant, Co-Cr alloy exhibited high corrosion resistance in EGCG-containing artifi cial saliva. On the contrary, when the complex formation reaction was dominant, Co-Cr alloy exhibited low corrosion resistance.

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The electrochemical behavior and surface analysis of Ti50Ni47.2Co2.8 alloy for orthodontic use

Cited by 30 publications

References 4 publications

Electrochemical Characterisation of Bovine Serum Albumin Adsorption on Phenolic- Coated Nickel-Titanium

Electrochemical Characterisation of Bovine Serum Albumin Adsorption on Phenolic- Coated Nickel-Titanium

In vitro corrosion behaviour of phenolic coated nickel–titanium surfaces

Effect of (−)-epigallocatechin gallate on electrochemical behavior and surface film composition of Co-Cr alloy used in dental restorations

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