Electrochemical Behaviour of Titanium Based Biomaterials in Artificial Saliva

2017 ◽  
Vol 68 (2) ◽  
pp. 396-400
Author(s):  
Kamel Earar ◽  
Camelia Ana Grigore ◽  
Cristian Budacu ◽  
Lucia Carmen Trinca ◽  
Daniel Mareci ◽  
...  
Keyword(s):  
Corrosion Resistance ◽  
Corrosion Behaviour ◽  
Layer Structure ◽  
Artificial Saliva ◽  
Electrochemical Behaviour ◽  
Grain Structure ◽  
Electrochemical Degradation ◽  
Nitrogen Diffusion ◽  
Implant Alloys ◽  
Modular Component

In the last decade, new titanium alloys such as Ti6Al7Nb and Ti6Al7NbN have been developed in different areas of dentistry. It is known that mechanical/electrochemical interactions accelerate corrosion in implant alloys, and these interactions can be reduced by improving the modular component machining tolerances or by improving the corrosion resistance. The aim of this study was to compare the Ti6Al7Nb and Ti6Al7NbN alloys corrosion resistance in AFNOR artificial saliva. Due to the nitrogen diffusion, the Ti6Al7NbN alloy presents more pronounced grain structure than Ti6Al7Nb. In the electrochemical estimations the polarisation data were converted into instantaneous corrosion rate values (jcorr). The obtained passivation properties were comparable for both alloys. The EIS spectra were best fitted using an equivalent circuit (EC) which was consistent with the model of a two-layer structure for the passive film. The electrochemical and corrosion behaviour of Ti6Al7NbN increased the occurrence of the implant alloy�s electrochemical degradation.

Comparison between corrosion behaviour of implant alloys Ti6Al7Nb and Ti6Al4Zr in artificial saliva

2012 ◽  
Vol 64 (6) ◽  
pp. 493-499 ◽  
Author(s):  
M. Dilea ◽  
A. Mazare ◽  
D. Ionita ◽  
I. Demetrescu
Keyword(s):  
Corrosion Behaviour ◽  
Artificial Saliva ◽  
Implant Alloys

Effect of Fluoride on the Corrosion Behavior of Ti and Ti6Al4V Dental Implants Coupled With Different Superstructures

2011 ◽  
Vol 37 (3) ◽  
pp. 309-317 ◽  
Author(s):  
Eman M Anwar ◽  
Lamia S Kheiralla ◽  
Riham H Tammam
Keyword(s):  
Corrosion Resistance ◽  
Dental Implants ◽  
Corrosion Behavior ◽  
Artificial Saliva ◽  
Fluoride Concentration ◽  
Ion Concentration ◽  
Fluoride Ion ◽  
All Ceramic ◽  
Metal Ceramic ◽  
Implant Alloys

Abstract The effect of fluoride ion concentration on the corrosion behavior of Ti and Ti6Al4V implant alloys, when coupled with either metal/ceramic or all-ceramic superstructure, was examined by different electrochemical methods in artificial saliva solutions. It was concluded that increased fluoride concentration leads to a decrease in the corrosion resistance of all tested couples. The type of the superstructure also showed a significant effect on the corrosion resistance of the couple.

Electrochemical Determination of the Corrosion Resistance of Ag-Pd Dental Alloys

2008 ◽  
Vol 59 (9) ◽  
Author(s):  
Daniel Mareci ◽  
Igor Cretescu ◽  
Neculai Aelenei ◽  
Julia Claudia Mirza Rosca
Keyword(s):  
Corrosion Resistance ◽  
Open Circuit Potential ◽  
Electrochemical Impedance ◽  
Corrosion Behaviour ◽  
Artificial Saliva ◽  
Surface Film ◽  
Electrochemical Determination ◽  
Open Circuit ◽  
Electrochemical Characteristics

The electrochemical behavior of a three Ag-Pd alloys used in dental prosthetics construction for crowns and bridges was studied in artificial saliva using the polarization curves and electrochemical impedance spectroscopy (EIS). The corrosion resistance was evaluated by means of the corrosion currents value and by coulometric analysis. The open circuit potential of Ag-Pd are attributed to dealloying followed by surface enrichment with Ag and the possible formation of an insoluble AgCl surface film on the respective alloy surfaces. Our results have shown that these alloys have a somewhat good corrosion resistance in artificial saliva. When increasing the content of Cu, corrosion resistance decreases. The passivation of all samples occurred spontaneously at the open circuit potential. The electrochemical properties of the spontaneously passivated electrodes at the open circuit potential were studied by EIS. The polarization resistance (Rp) and the electrode capacitance (Cdl) were determined. The polarisation resistance of all the samples increases with the immersion time. The polarization resistances are largest and decrease when increasing the content of Cu. Cu reduces the Ag-Pd alloy corrosion resistance. The present study, thought limited, has shown that electrochemical characteristics can be use to identify such alloys. Knowledge of the in vitro corrosion behaviour of these alloys may lead to better understanding of any biologically adverse effects in vitro.

Stainless Steel Brackets: In Vitro Corrosion Behaviour and Mechanical Debonding Test

2014 ◽  
Vol 216 ◽  
pp. 187-193
Author(s):  
Mihai Cosmin Cotrut ◽  
Mihai Tarcolea ◽  
Maria Diana Vrânceanu ◽  
Ana Iulia Gherghilescu ◽  
Nicolae Ghiban ◽  
...  
Keyword(s):  
Mechanical Characteristics ◽  
Corrosion Behaviour ◽  
Artificial Saliva ◽  
Electrochemical Behaviour ◽  
Orthodontic Appliances ◽  
Shear Tests ◽  
X Ray ◽  
Ph Values ◽  
Good Behaviour

The purpose of the study was to investigate the microchemical, morphological, mechanical and anticorrosive characteristics of the metallic brackets by using energy-dispersive X-ray spectroscopy (EDS), scanning electron microscopy (SEM), electrochemical and shear tests. The changes resulted from the exposure of the metallic brackets to artificial saliva and debonding forces were investigated under orthodontic appliances. The results have shown that metallic brackets studied in this paper present a good design, great electrochemical behaviour in artificial saliva for different pH values (2, 5 and 7), and also great mechanical properties. In the case of shear stress the obtained values were higher than the clinical accepted value. The metallic brackets studied in this paper present a good behaviour in artificial saliva, and good mechanical characteristics. The ARI investigation revealed that most of the adhesive was left on the bracket.

In Vitro Corrosion Behaviour of Metallic Dental Materials

2015 ◽  
Vol 1114 ◽  
pp. 258-265 ◽  
Author(s):  
Diana Maria Vrânceanu ◽  
Mihai Tarcolea ◽  
Ana Iulia Gherghilescu ◽  
Florin Miculescu ◽  
Mihai Cosmin Cotrut
Keyword(s):  
Stainless Steel ◽  
Corrosion Resistance ◽  
316L Stainless Steel ◽  
Corrosion Behaviour ◽  
Artificial Saliva ◽  
Dental Materials ◽  
Ti6al4v Alloy ◽  
Solution Ph ◽  
Cp Ti ◽  
Selection Of

Typical applications of metallic dental materials include metal-ceramic restorations, dental implants or orthodontic systems. Due to their contact with human tissues, corrosion resistance is one of the main requirements for dental materials. In the present paper, the corrosion behaviour in Fusayama Meyer artificial saliva solution (pH=5.2) on a selection of four different metallic dental materials (316 L steel, Au based alloy, cp-Ti, Ti6Al4V alloy) currently used in dentistry were investigated. The metallic dental materials have been investigated in terms of electrochemical analysis, chemical composition, morphology before and after corrosion, wettability and roughness. The results showed a hydrophilic behaviour in the case of Au based alloy, cp-Ti and Ti6Al4V alloy, and hydrophobic for 316L stainless steel. Considering the main electrochemical parameters, the cp-Ti alloy exhibited better corrosion resistance in artificial saliva with pH=5.2, followed by Au based alloy, Ti6Al4V alloy and 316L stainless steel. The main objective of the present paper was to evaluate the corrosion behaviour, as in important factor in the selection of metallic materials used in dentistry.

scholarly journals Salivary pH Effect on Orthodontic Appliances: In Vitro Study of the SS/DLC System

Coatings ◽  
2021 ◽  
Vol 11 (11) ◽  
pp. 1302
Author(s):  
António Fróis ◽  
Manuel Evaristo ◽  
Ana Cristina Santos ◽  
Cristina Santos Louro
Keyword(s):  
Corrosion Resistance ◽  
Corrosion Behaviour ◽  
Artificial Saliva ◽  
Ph Effect ◽  
In Vitro Study ◽  
Vitro Study ◽  
Orthodontic Appliances ◽  
Fixed Orthodontic Appliances ◽  
Salivary Ph

Stainless steels (SS) are the most-used alloys for manufacturing fixed orthodontic appliances due to their attractive set of mechanical properties, biocompatibility, and high corrosion resistance. Nevertheless, during regular orthodontic treatments–taking at least around 2 years–the intraoral environment inevitably degrades these bioalloys, releasing metallic ions into the oral cavity. In the first part of this in vitro study, the corrosion resistance of commercial SS appliances (brackets, tubes, and bands) was evaluated in Fusayama-Meyer artificial saliva at pH values of 2.3 and 6.8 over the course of 30 days. As expected, the results corroborated that salivary pH highly influences corrosion behaviour. Released Ni, Cr, and Fe were within dietary intake values. In the second part, a novel approach for oral corrosion prevention based on the chemical inertness of DLC materials is presented. SS surfaces were functionalized with biocompatible a-C:H-sputtered coatings and submitted to the same experimental conditions. The anticorrosion ability of this system was demonstrated, preventing the pitting corrosion that occurred on the SS substrates. Despite the galvanic coupling effect due to the presence of the Cr-based interlayer, this study enhanced the potential use of the reactive sputter-deposited a-C:H coatings in orthodontics.

scholarly journals Nanocrystalline Cermet Coatings for Erosion–Corrosion Protection

Coatings ◽  
2019 ◽  
Vol 9 (6) ◽  
pp. 400 ◽  
Author(s):  
Abhishek Tiwari ◽  
Saravanan Seman ◽  
Gaurav Singh ◽  
Rengaswamy Jayaganthan
Keyword(s):  
Wear Resistance ◽  
Corrosion Resistance ◽  
Corrosion Protection ◽  
Corrosion Behaviour ◽  
Grain Structure ◽  
Homogeneous Distribution ◽  
Ceramic Phase ◽  
Cermet Coatings ◽  
Carbide Phases ◽  
Erosion Corrosion

The processing techniques, microstructural characteristics, and erosion corrosion behaviour of Cr3C2–NiCr and tungsten carbide (WC)-based cermet coatings are reviewed in this work. Conventional and nanocrystalline Cr3C2–NiCr and WC-based cermet coatings are generally synthesized using thermal spray technique. The wear, erosion, and corrosion protection ability of conventional and nanocermet coatings are compared based on available literature. In Cr3C2–NiCr coatings, the corrosion resistance is offered by NiCr metal matrix while the wear resistance is provided by the carbide ceramic phase, making it suitable for erosion–corrosion protection. The nanocrystalline cermet coatings exhibits better erosion–corrosion resistance as compared to the conventional coatings. The nanocrystalline coatings reduces the erosion–corrosion rate significantly compared to conventional coatings. It is attributed to the presence of the protective NiCr metallic binder that allows easier and faster re-passivation when the coating is subjected to wear and the fine-grain structure with homogeneous distribution of the skeleton network of hard carbide phases. In addition, corrosion-accelerated erosion dominates the reaction mechanism of erosion–corrosion and, therefore, higher hardness, strength, and better wear resistance of nanocermet coating along with its faster repassivation kinetics accounts for improved corrosion resistance as compared to conventional coatings.

Improvement of the Corrosion Resistance of Biomedical Magnesium Alloys in the Ringer’s Solution Using Protective Coatings

2015 ◽  
Vol 227 ◽  
pp. 459-462
Author(s):  
Iwona Kot ◽  
Halina Krawiec
Keyword(s):  
Corrosion Resistance ◽  
Magnesium Alloys ◽  
Electrochemical Impedance ◽  
Protective Coatings ◽  
Corrosion Behaviour ◽  
Composite Coatings ◽  
Electrochemical Behaviour ◽  
Dip Coating ◽  
Biodegradable Implant ◽  
Ringer’S Solution

The corrosion resistance of magnesium alloys depends on their microstructure, especially the presence of different intermetallic phases and precipitates. In this paper, the electrochemical behaviour of Mg1Ca and Mg1Ca1Si magnesium alloys has been investigated in the Ringer’s solution at 37 °C. In order to improve the corrosion resistance of these magnesium alloys composite coatings were fabricated by modification of a chitosan layer. The coatings were prepared by dip-coating in a chitosan solution and then modified by electrochemical deposition of a layer from a solution containing fluorine ions and water glass. The electrochemical performance of chitosan and chitosan modified coated alloys was evaluated by linear sweep voltamperometry and electrochemical impedance spectroscopy. The coated magnesium alloys possess suitable corrosion behaviour for the application as biodegradable implant material.

scholarly journals Corrosion Behaviour of Ti-6Al-4V Alloy with Nitride Coatings in Simulated Body Fluids at 36∘C and 40∘C

2013 ◽  
Vol 2013 ◽  
pp. 1-7 ◽  
Author(s):  
I. M. Pohrelyuk ◽  
O. V. Tkachuk ◽  
R. V. Proskurnyak
Keyword(s):  
Corrosion Resistance ◽  
Corrosion Behaviour ◽  
Electrochemical Behaviour ◽  
Body Fluids ◽  
Nitride Coating ◽  
Nitride Coatings ◽  
Simulated Body Fluids

Nitride coatings were formed on Ti-6Al-4V alloy by thermodiffusion treatment. The corrosion-electrochemical behaviour of Ti-6Al-4V alloy with nitride coatings I and II was investigated in physiological solutions (0.9% NaCl and Tyrode's) at temperatures of 36∘C and 40∘C. It is determined that nitride coating I provides Ti-6Al-4V alloy the higher corrosion resistance in Tyrode's solution at both temperatures of solution while nitride coating II in isotonic 0.9% NaCl.

scholarly journals Electrochemical behaviour of titanium alloys in artificial saliva

2005 ◽  
Vol 70 (6) ◽  
pp. 891-897 ◽  
Author(s):  
Daniel Mareci ◽  
Catalin Bocanu ◽  
Gheorhe Nemtoi ◽  
Delia Aelenei
Keyword(s):  
Corrosion Resistance ◽  
Titanium Alloys ◽  
Artificial Saliva ◽  
Electrochemical Behaviour ◽  
Electrochemical Corrosion ◽  
Protective Layer ◽  
Electrochemical Treatment ◽  
Passive Layer ◽  
Commercial Titanium ◽  
Electrochemical Corrosion Resistance

Titanium alloys are used in odontology applications owing to their excellent biocompatibility. The corrosion resistance of titanium alloys is an important component of their biocompatibility. In this study, the electrochemical corrosion resistance of Ti6Al4V, Ti6Al7Nb, Ti6Al2Nb1Ta1Mo, Ti5Al2,5Fe and commercial titanium in Afnor saliva was investigated. Maintaining titanium and Ti6Al7Nb alloy in Afnor saliva for 7 days results in the formation of a protective layer, the resistance of which is high and could be comparedwith that of a passive layer resulting from electrochemical treatment. The replacement of vanadium with niobium or iron favours the passivation, thus increasing the corrosion resistance.

Sign in / Sign up

Export Citation Format

Share Document