Corrosion in artificial saliva of a Ni-Cr-based dental alloy joined by TIG welding and conventional brazing

Matos, Irma Cunha; Bastos, Ivan Napoleão; Diniz, Marília Garcia; Miranda, Mauro Sayão de

doi:10.1016/j.prosdent.2015.01.017

Cited by 22 publications

(30 citation statements)

References 24 publications

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“…If the open circuit potential of electrode with change at the negative direction in these solutions it effects as anodic inhibitor. But if it is act as both anodic and cathodic inhibitor, it can be not any change at the open circuit potential [34][35][36][37]. Electrochemical methods performed with potential-time (OCP), AC-impedance, current-potential curves in different oral solution for noble (Au, Pd, Rh, Cu, Ag, Pt, Ir) metals.…”

Section: Discussionmentioning

confidence: 99%

Corrosion Behavior of Noble Metals in Different Oral Media

2019

JSTR

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In this first study, the corrosion behavior of the noble (Au, Pd, Rh, Cu, Ag, Pt, Ir) metals studied in 0.1M citric acid (CA), 10% carbamide peroxide (CP), artificial saliva (AS) and in the presence of CP, mouthwash (MW) and in presence of AS, and 0.1M NaCl solutions as oral solution. Electrochemical methods investigated with open circuit potential, impedance spectroscopy, current-potential and linear polarization measurements. Metal electrodes immersed in different oral solutions during a week for the determination of total metal cations. These cations analyzed by ICP-OES/MS. This article outline determined with corrosion tendencies of the noble metals and the amount of these ions passing through the human body. Scanning electron microscope (SEM) images showed that gold surface damaged in the presence of the CP. Additionally, the surface examined with EDS. It is concluded that the corrosion rate of noble metals increased in the presence of carbamide peroxide, due to the additional reactions pathways mediated by hydrogen peroxide anions.

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Section: Discussionmentioning

confidence: 99%

Corrosion Behavior of Noble Metals in Different Oral Media

2019

JSTR

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“…The flexural strength was calculated according to the following formula: In which P is the maximum force (N), I is the distance between the supports (mm), b was the sample width (mm), d is the sample thickness (mm), and Σ is the flexural strength (MPa) 17 .…”

Section: Methodsmentioning

confidence: 99%

“…Although the conventional brazing technique is more used in dentistry, studies have demonstrated the superiority of tungsten inert gas (TIG) welding 15,16 . This process uses an electric arc formed between a non-consumable tungsten electrode and the part to be fused and applies an inert gas (argon or helium) to provide local protection to prevent oxidation [17][18][19][20] . In this type of welding, heating is concentrated and disorders and deformation are minimized; furthermore, there is an increase in corrosion resistance due to the lack of galvanic effects in the joint 17 .…”

Section: Introductionmentioning

confidence: 99%

Evaluation of ceramic flexural strength of a cobalt-chromium alloy subjected to airborne particle abrasion and tungsten inert gas welding

et al. 2019

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Aim: The aim of this study was to evaluate the influence of tungsten inert gas (TIG) welding and airborne particle abrasion using aluminum oxide particles on the flexural strength of a joint between ceramic and cobalt-chromium alloys. Methods: The specimens were cast and welded using TIG, then divided into 6 groups (n = 10) and subjected to blasting with 250 μm, 100 μm, and 50 μm aluminum oxide particles. Ceramic systems were applied to the central part of all specimens. A three-point bending test using a velocity of 0.5 mm/m was performed on the specimens to measure flexural strength. Data were analyzed using two-way analysis of variance and Tukey’s test. Results: TIG welding demonstrated the lowest resistance compared with the non-welded groups. Airborne particle abrasion using 250 μm aluminum oxide particles demonstrated greater resistance in the welded groups (p < 0.05). Mixed faults were found in all specimens. Conclusion: TIG welding decreased the bond strength, and the particle size of aluminum oxide did not affect the metal-ceramic bond in groups without TIG welding.

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“…The existence of chloride ions in the saliva solutions causes pitting corrosion is well visible in the experimental studies after SEM examinations of the surface of metals and alloy. Evidence of pitting corrosion formed on the wire surface is shown by Stainless steel [27], Co-Cr [14][15][16][17][18], Ni-Cr [18,22,23], Ni-Ti alloy [27,36], uncovered to electrochemical study.…”

Section: Effects Of the Chloride Ionmentioning

confidence: 99%

“…It is further enhanced by the fluoride ions in toothpaste and in the products used as mouthwash as it plays the role of an essential factor accelerating corrosion [5][6][7][8][9]. Corrosion resistance of biomaterials made up of various metals and alloys has been investigated in artificial saliva (AS); various metals and alloys such as Ti-Co alloy [10], Ti30Ta alloy [11], Ti metal, Ti6-Al-7Nb, and Ti-6Al-4V alloy [1,12], Ti-6Al-7Nb alloy [13], Co-Cr alloy [14][15][16][17][18], CP-Ti and Ni-Cr-Ti alloy [19], Co-Cr-Mo alloy [20,21], Ni-Cr alloy [18,22,23], Ti-Cu [24], Ti-20Zr alloy [25], Ti12Mo and Ti60Ta [26], Ni-Ti shape memory alloy and stainless steel wire [27], Ti-Mo [28], mild steel coated with zinc [29], NaOCl [30], and 60NiTi [31]. Corrosion resistance of various metals has been investigated in AS.The composition of artificial saliva is given in Table 1.…”

Section: Introductionmentioning

confidence: 99%

Effect of Artificial Saliva on the Corrosion Behavior of Dental Alloys: A review

Kokila¹,

Devimeenakshi²

2019

IJRTER

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Dental erosion is the chemical dissolution of the tooth structure. Factors like eating disorders and gastrointestinal diseases are recognized as intrinsic factors for dental erosion. To regulate the growth of teeth, people are implanted with orthodontic wires made of different materials. These are exposed to the influence of oral environment, food intake, toothpastes, and mouthwashes. During this process, the materials may undergo corrosion. Hence, various researchers have made a study on the influence of artificial saliva (AS) on the corrosion behavior of these alloys. The excellent corrosion resistance to the oral environment of dental alloys is important for biocompatibility as well as for orthodontic employment permanence. Various types of metal alloys are being used for the orthodontic treatment, which undergo chemical or electrochemical reaction with the oral environment. The oral environment is highly belligerent under several situations and leads to corrosion. This article reviews the effects of fluoride concentration, the pH value and protein content in AS and the composition of the metal alloys on the corrosion resistance of orthodontic appliances using electrochemical methods and surface characterization techniques such as scanning electron microscopy inductively coupled plasma-optical emission spectroscopy (ICP-OES) and X-ray photoelectron microscopy.

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Corrosion in artificial saliva of a Ni-Cr-based dental alloy joined by TIG welding and conventional brazing

Cited by 22 publications

References 24 publications

Corrosion Behavior of Noble Metals in Different Oral Media

Corrosion Behavior of Noble Metals in Different Oral Media

Evaluation of ceramic flexural strength of a cobalt-chromium alloy subjected to airborne particle abrasion and tungsten inert gas welding

Effect of Artificial Saliva on the Corrosion Behavior of Dental Alloys: A review

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