Study of electrochemical corrosion of biocompatible Co–Cr and Ni–Cr dental alloys in artificial saliva. Influence of pH of the solution

Turdean, Graziella Liana; Craciun, Antarinia; Popa, Daniela; Constantiniuc, Mariana

doi:10.1016/j.matchemphys.2019.05.041

Cited by 22 publications

(11 citation statements)

References 36 publications

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“…Starting with the easiest one, several models of electrical circuits were examined when analyzing the impedance data [28,55] for specimens Ni1, Ni2, Ni3, Co1, and Co2, with the best fit obtained for all the determinations using the EC presented in Figure 8. In the model presented in Figure 8, the ohmic resistance of the electrolyte was designated R sol , the resistance of the passive film was designated R1, the passive film capacitance was represented as CPE 1 , the charge transfer resistance (R ct ) was designated R 2 , and the double-layer capacitance was represented as CPE 2 .…”

Section: Resultsmentioning

confidence: 99%

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Analysis and Comparison of the Corrosive Behavior of Nickel-Based and Cobalt-Based Dental Alloys

et al. 2021

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Nickel-based and cobalt-based metal alloys are frequently used in dentistry. The introduction of various elements in the alloy changes its characteristics, and a thorough study of each alloy should be completed to determine its appropriate corrosion resistance and biocompatibility in contact with physiological fluids. There are scarce investigations on these widely used dental alloys in Ringer solution, and findings in this research bring new experimental data and information. The present study evaluated and compared the corrosion behavior of six NiCr- and two CoCr-based dental materials in Ringer solution, using the following techniques: potentiostatic polarization curves (chronoamperometry), microstructural analysis, and EIS (electrochemical impedance spectroscopy). The results obtained in this investigation showed that in the NiCr-based specimens Ni4, Ni5, and Ni6 the stability of the passive layer was destroyed after polarization and a development and growth of stable pits was found in the microstructural analysis after electrochemical treatment. In terms of susceptibility to corrosion, two different groups of specimens were derived from this investigation. A first group which included the two CoCr (Co1 and Co2) and three of the six NiCr alloys studied (Ni1, Ni2, and Ni3). A second group with the other NiCr alloys investigated Ni4, Ni5, and Ni6.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Analysis and Comparison of the Corrosive Behavior of Nickel-Based and Cobalt-Based Dental Alloys

et al. 2021

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“…It must be highlighted that for all-coated surfaces, Q coat and R coat represent the constant phase element and polarization resistance of the composite coating, Q ct and R ct represent the constant phase element and polarization resistance of the charge transfer, and R sol value represents the solution resistance. The value of the roughness factor n for these layers represents their ability to have a behavior close to an ideal capacitor when n is close to 1 [56,57]. All studied composites have the same behavior either in a standard redox probe (5 mM K 3 [Fe(CN)] 6 /K 4 [Fe(CN)] 6 + 0.1 M KCl) or in an SBF at pH 7.…”

Section: Electrochemical Impedance Spectroscopy Measurementsmentioning

confidence: 99%

Hydroxyapatite and Silicon-Modified Hydroxyapatite as Drug Carriers for 4-Aminopyridine

et al. 2021

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Adsorption and desorption properties of nano-hydroxyapatite (HAP) and silicon-modified hydroxyapatite (Si–HAP) were investigated with 4-aminopyridine (fampridine-4AP). The novelty of this research is the investigation of the suitability of the previously mentioned carriers for drug-delivery of 4AP. UV-VIS spectrophotometric results showed that the presence of silicon in the carrier did not significantly affect its adsorption capacity. The success of the adsorption was confirmed by thermal analysis (TG/DTA), scanning electron microscopy (SEM)/energy dispersive X-ray (EDX), Fourier transform infrared (FTIR) spectroscopy, and X-ray powder diffraction (XRPD). Drug release experiments, performed in simulated body fluid (SBF), revealed a drug release from Si–HAP that was five times slower than HAP, explained by the good chemical bonding between the silanol groups of the carrier and the 4AP functional groups. The electrochemical measurements showed a value of the polarization resistance of the charge transfer (Rct) more than five times smaller in the case of Si–HAP coating loaded with 4AP, so the charge transfer process was hindered. The electrochemical impedance results revealed that electron transfer was inhibited in the presence of 4AP, in concordance with the previously mentioned strong bonds. The silicon substitution in HAP leads to good chemical bonding with the drug and a slow release, respectively.

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“…In the long history of dental biomaterials, precious and nonprecious metals and alloys with Au, Ag, Ti, Fe, Cr, Co, Al, have been frequently selected due to their numerous favorable, chemical, biological physical features as well as mechanical properties [1][2][3][4]. These materials have significant mechanical properties, such as stiffness strength and corrosion resistance and are more easily used and cheaper to elaborate; processed CoCr and NiCr alloys are still frequently investigated and used in dental laboratories as convenient choices for restorative dental works such as crow, bridge, and denture bases [5][6][7][8][9]. Extended use of metals as regenerative biomaterials starting the end of the last century has led to a strong development of titanium and titanium alloys materials introducing intensive binary and ternary alloys with Al, Nb, V, and Zr as selected alloys [10][11][12].…”

Section: Introductionmentioning

confidence: 99%

“…The main aim of the above cited papers was to determine the corrosion behavior of dental alloys in various media, starting from the idea that food and drinks in the oral cavity introduce various compositions establishing different pH levels ranging from acid to basic values [6]. Corrosion of dental alloys in the intra-oral cavity is leading not only to the deterioration of restorative works, but also involves a release of ions that is related to their biocompatibility [13].…”

Section: Introductionmentioning

confidence: 99%

A Comparative Electrochemical and Morphological Investigation on the Behavior of NiCr and CoCr Dental Alloys at Various Temperatures

Golgovici

Prodana

Ionascu

et al. 2021

Metals

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The purpose of our study is to compare the behavior of two reprocessed dental alloys (NiCr and CoCr) at different temperatures considering the idea that food and drinks in the oral cavity create various compositions at different pH levels; the novelty is the investigation of temperature effect on corrosion parameters and ion release of dental alloys. Electrochemical stability was studied together with morphology, elemental composition and ions release determination. The results obtained are in good concordance: electrochemistry studies reveal that the corrosion rate is increasing by increasing the temperature. From SEM coupled with EDS, the oxide film formed on the surface of the alloys is stable at low temperatures and a trend to break after 310K. ICP-MS results evidence that in accordance with increasing temperature, the quantities of ions released from the alloys immersed in artificial saliva also increase, though they still remain small, less than 20 ppm.

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Study of electrochemical corrosion of biocompatible Co–Cr and Ni–Cr dental alloys in artificial saliva. Influence of pH of the solution

Cited by 22 publications

References 36 publications

Analysis and Comparison of the Corrosive Behavior of Nickel-Based and Cobalt-Based Dental Alloys

Analysis and Comparison of the Corrosive Behavior of Nickel-Based and Cobalt-Based Dental Alloys

Hydroxyapatite and Silicon-Modified Hydroxyapatite as Drug Carriers for 4-Aminopyridine

A Comparative Electrochemical and Morphological Investigation on the Behavior of NiCr and CoCr Dental Alloys at Various Temperatures

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