Study of Electrochemical Behavior of Some Dental Alloys

2018 ◽  
Vol 69 (6) ◽  
pp. 1598-1602
Author(s):  
Alice Arina Ciocan Pendefunda ◽  
Constanta Mocanu ◽  
Doriana Agop Forna ◽  
Cristina Iordache ◽  
Elena Luca ◽  
...  
Keyword(s):  
Oral Cavity ◽  
Electrochemical Behavior ◽  
Base Alloy ◽  
Artificial Saliva ◽  
Surface Condition ◽  
Continuous Process ◽  
Metal Alloys ◽  
Alloy Surface ◽  
Dental Alloys ◽  
Dental Restorations

The purpose of the study is to investigate the electrochemical behavior of two dental alloys: palladium alloy (Palidor) and Ni-Cr alloy (Verasoft) in three types of artificial saliva. Determination of corrosion potential and recording of linear and cyclic polarization curves were performed with PGP201 potentiostat (VoltaLab 21- Radelkis Copenhagen. In order to study the modifications produced on the surface of the electrodes, a complex optical microscope MC 1 research type (IOR, Romania) was used, adapted to a digital camera, which was connected to a computer for the digital acquisition of images . Two metal alloys based on Ag-Pd and Ni-Cr were used for the experiments. The materials used came from different types of dental restorations removed from the oral cavity of the patients after a 5-15 years period. As corrosion environments, three artificial saliva were used: Fusayama, Afnor and Rondelli. The Pd-Ag dental alloy exhibits a very good corrosion resistance and the treatment in the Afnor saliva does not affect the surface of the alloy. Electrochemical behavior in Fusayama-Meyer�s saliva of the alloy surface results in a series of spots representing deposits of insoluble salts resulting from the oxidation process, while in the Rondelli saliva there is a series of small corrosion points on the alloy surface. The behavior of the Verasoft alloy in the Afnor and Rondelli saliva is similar; In both solutions, the potential breakthroughs are very close, but in Fusayama-Meyer�s saliva, the potential for initiation of corrosion points is very low (206 mV), a potential that can be encountered in the oral cavity. All metals and metal alloys, even the noble and semi-precious ones, are susceptible to corrosion, forming compounds with properties different from those of the metal or base alloy, which change their surface condition. Metallic dental restorations are permanently affected by the factors of the oral environment (physical-mechanical, chemical and biological), being subjected to a continuous process of degradation.

Study of the Electrochemical Behavior of Gold Dental Alloys

1973 ◽  
Vol 52 (4) ◽  
pp. 828-836 ◽  
Author(s):  
J. Brugirard ◽  
R. Bargain ◽  
J.C. Dupuy ◽  
H. Mazille ◽  
G. Monnier
Keyword(s):  
Electrochemical Behavior ◽  
Artificial Saliva ◽  
Electrochemical Methods ◽  
Alloying Elements ◽  
Dental Alloys

The corrosion of some gold base alloys was studied in artificial saliva through the use of electrochemical methods, primarily potentiokinetic curves. The effects of various alloying elements were investigated.

ChemInform Abstract: Electrochemical Behavior of Titanium and Dental Alloys in Artificial Saliva.

ChemInform ◽  
2010 ◽  
Vol 24 (47) ◽  
pp. no-no
Author(s):  
K. ELAGLI ◽  
M. TRAISNEL ◽  
H. F. HILDEBRAND
Keyword(s):  
Electrochemical Behavior ◽  
Artificial Saliva ◽  
Dental Alloys

Influence of Si and REE on the Corrosion Resistance of ZnAl40Cu3 Alloy

2013 ◽  
Vol 212 ◽  
pp. 133-136 ◽  
Author(s):  
Rafał Michalik
Keyword(s):  
Corrosion Resistance ◽  
Rare Earth ◽  
Rare Earth Elements ◽  
Base Alloy ◽  
Surface Condition ◽  
Alloy Surface ◽  
Corrosion Tests

The corrosion resistance of ZnAl40Cu3 alloy are presented in the paper. Base alloy, alloy with silicon and alloy with silicon and rare earth elements were tested. The scope of the examination included: potentiodynamic and potentiostatic examinations, studies of the alloy surface condition after corrosion tests. The studies have shown, that the addition of rare earth elements improves the corrosion resistance of the ZnAl40Cu3 alloy in 3% NaCl environment. The presence of the silicon precipitates does not decrease the corrosion resistance of the ZnAl40Cu3 alloy in the 3% NaCl environment

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

Metals ◽  
2021 ◽  
Vol 11 (2) ◽  
pp. 256
Author(s):  
Florentina Golgovici ◽  
Mariana Prodana ◽  
Florentina Gina Ionascu ◽  
Ioana Demetrescu
Keyword(s):  
Low Temperatures ◽  
Artificial Saliva ◽  
Electrochemical Stability ◽  
Morphological Investigation ◽  
Dental Alloys ◽  
Ion Release ◽  
Icp Ms ◽  
Different Temperatures ◽  
Good Concordance ◽  
Increasing Temperature

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.

scholarly journals Influence of HAP on the Morpho-Structural Properties and Corrosion Resistance of ZrO2-Based Composites for Biomedical Applications

Crystals ◽  
2021 ◽  
Vol 11 (2) ◽  
pp. 202
Author(s):  
Réka Barabás ◽  
Carmen Ioana Fort ◽  
Graziella Liana Turdean ◽  
Liliana Bizo
Keyword(s):  
Electrochemical Impedance ◽  
Artificial Saliva ◽  
Synergetic Effect ◽  
Composite Layer ◽  
Charge Transfer Resistance ◽  
Processing Route ◽  
Dental Alloys ◽  
Metallic Electrode ◽  
Transfer Resistance ◽  
X Ray

In the present work, ZrO2-based composites were prepared by adding different amounts of antibacterial magnesium oxide and bioactive and biocompatible hydroxyapatite (HAP) to the inert zirconia. The composites were synthesized by the conventional ceramic processing route and morpho-structurally analyzed by X-ray powder diffraction (XRPD) and scanning electron microscopy/energy dispersive X-ray spectroscopy (SEM/EDS). Two metallic dental alloys (i.e., Ni–Cr and Co–Cr) coated with a chitosan (Chit) membrane containing the prepared composites were exposed to aerated artificial saliva solutions of different pHs (i.e., 4.3, 5, 6) and the corrosion resistances were investigated by electrochemical impedance spectroscopy technique. The obtained results using the two investigated metallic dental alloys shown quasi-similar anticorrosive properties, having quasi-similar charge transfer resistance, when coated with different ZrO2-based composites. This behavior could be explained by the synergetic effect between the diffusion process through the Chit-composite layer and the roughness of the metallic electrode surface.

scholarly journals The Surface Condition of Ni-Cr after SiC Abrasive Blasting for Applications in Ceramic Restorations

Materials ◽  
2020 ◽  
Vol 13 (24) ◽  
pp. 5824
Author(s):  
Weronika Czepułkowska-Pawlak ◽  
Emilia Wołowiec-Korecka ◽  
Leszek Klimek
Keyword(s):  
Surface Condition ◽  
Abrasive Particle ◽  
Surface Profile ◽  
Abrasive Particles ◽  
Dental Restorations ◽  
Large Width ◽  
Ceramic Restorations ◽  
The Impact ◽  
Abrasive Size ◽  
Abrasive Blasting

Abrasive blasting is a process widely used in dentistry. One of the uses is the development of metal surfaces for connections with ceramics in fixed prosthetic restorations. The purpose of this paper was to check how the rough surface profile (width, height, and depth on unevenness) impacts the surface’s condition, like its wettability and percentage of stuck abrasives. The Ni-Cr alloy surface was abrasive blasted by silicon carbide with the various pressure parameters (0.2, 0.4, and 0.6 MPa) and abrasive particle sizes (50, 110, and 250 µm). Cleaned surfaces were examined for roughness, wettability, and percentage of stuck abrasive particles on the surface. The surface after abrasive blasting using 110 µm of abrasive size and 0.4 MPa pressure has the best wettability results. The width of unevenness may cause it. When the unevenness has too small or too large width and depth, the fluids may not cover the entire cavities because of locking the air. The surface condition of dental alloys directly affects metal–ceramic connection strength. The knowledge about the impact of the abrasive blasting parameters on the bond strength will allow one to create durable dental restorations.

scholarly journals POTENTIOMETRIC PARAMETERS IN PATIENTS WITH NON-REMOVABLE ORTHOPEDIC STRUCTURES AND INTRAORAL HALITOSIS

2018 ◽  
pp. 17-20
Author(s):  
O.A. Udod ◽  
A.O. Hlivynska
Keyword(s):  
Oral Cavity ◽  
Physicochemical Parameters ◽  
Oral Fluid ◽  
Personal Hygiene ◽  
Control Group ◽  
Social Maladjustment ◽  
Dental Alloys ◽  
The Third ◽  
Unpleasant Odor ◽  
Bioelectric Potentials

Introduction. The most popular type of dentures is permanent orthopedic structures. However, their use is a serious intervention that changes biological balance in the oral cavity through galvanic, reflex and toxic allergic effects. Because of this, galvanic currents appear in the oral cavity, which have an adverse effect on the oral mucosa and the physicochemical parameters of the oral fluid. As a result of increasing bioelectric potentials in the oral cavity, oral microbiocenosis disorders may occur, the periodontium pathology develops or worsens and an unpleasant odor arises, which in aggregate can cause a social maladjustment of the patient. It is known that the main intraoral factor in the development of halitosis is the unsatisfactory hygienic condition of the oral cavity. Non-removable dentures made from non-noble dental alloys can also significantly affect the development of intraoral halitosis. Objective. To study potentiometric parameters in patients with intraoral halitosis who have fixed orthopedic constructions made of various materials by various technologies. Methods and Materials. 158 people aged 35-55 years with fixed orthopedic constructions in the oral cavity in the amount of 5-8 units with a service life of 2-3 years were examined. Four groups were formed: with stamped-brazed dentures, with cast-denture prostheses from dental alloys, with cast-in-place titanium structures and a control group without disrupting the integrity of the dentition. All patients underwent a sanation of the oral cavity, professional hygiene and anti-inflammatory treatment. In addition, hygienic training of patients with quality control of personal hygiene was conducted. In the course of the study, 35 patients from the first and second groups after the complex treatment were replaced by replacing the existing dentures with orthopedic structures made of titanium. The effectiveness of treatment was assessed by the dynamics of indices of hygiene, PMA, organoleptic assessment of halitosis and potentiometric parameters. Results. As a result of the study, it was found that patients with dentures, manufactured with the help of the stamped-brazed technology, were characterized by high indices of hygiene (1.29 ± 0.18 points) and PMA (66.79 ± 2.48%). The I degree of halitosis was observed in 27 patients (41.5%) of this group, II degree was observed in 35 people (53.8%) and III degree in 3 people (4.6%). In the second group, the hygiene index was 0.97 ± 0.12, the PMA index was 65.57 ± 2.18%. In 33 patients (67.4%) I degree of halitosis was detected, in 16 patients (32.6%) – II degree. In the third group, the hygiene index was 0.84 ± 0.12, the PMA index was 56.23 ± 1.22. Unpleasant odor in the majority of patients in this group (40 people or 90.9%) was determined when approaching a distance of 10 cm, which corresponded to I degree of halitosis. Only 4 patients (9.1%) had halitosis of II degree. In the control group, the KPI index was 12.13 ± 0.24, the level of hygiene was on average 0.81 ± 0.12 points and 55.56 ± 1.13%, respectively. There were no organoleptic signs of halitosis in this group.

Multifunctional artificial saliva preparation – challenges and needs

2021 ◽  
Vol 8 ◽  
pp. 37-46
Author(s):  
Katarzyna Niemirowicz-Laskowska ◽  
Joanna Mystkowska ◽  
Dawid Łysik ◽  
Sylwia Chmielewska ◽  
Łukasz Suprewicz ◽  
...  
Keyword(s):  
Oral Cavity ◽  
Artificial Saliva ◽  
Salivary Secretion ◽  
Biological Properties ◽  
Pharmacological Therapy ◽  
Oral Microbiome ◽  
Dry Mouth ◽  
Rheological Parameters ◽  
Saliva Substitutes

Saliva plays a crucial role in maintaining homeostasis not only within the oral cavity but also in further sections of the gastrointestinal tract. Pleiotropic properties of saliva include participation in the digestion of carbohydrates, cleansing and moisturizing the oral cavity, and maintaining the composition of the oral microbiome. The result of impaired function of the salivary gland is reduced salivation – hyposalivation, leading to dry mouth – xerostomia. It is established that numerous physiological factors (age, sex, weight change) and pathological factors (polytherapy, head and neck cancer, coexisting diseases such as diabetes, depression, cardiovascular diseases) lead to the reduction in saliva secretion, and in effect, causing a dry mouth. Treatment of salivary secretion disorders involves pharmacological therapy (including hormone therapy) or replacement therapy which based on the use of saliva substitutes. In the case of disturbances in the secretion of natural saliva, the application of the artificial saliva preparations should support the chewing processes, moisturize the oral cavity, and fulfill the biological functions of saliva. However, to date, on the pharmaceutical market, there are no saliva substitutes that meet the biological criteria and maintaining favorable physicochemical properties and rheological parameters. Taking into account the problems of the patients which are burden by impaired salivary secretion, the aim of our research was to attempt to develop an artificial saliva preparation that reflecting as much as possible the properties of natural saliva, both in terms of mechanical and biological properties. As part of the research, the chemical composition was developed and a detailed study of the physicochemical and rheological parameters of artificial saliva preparations containing mucins as well as their microbiological and biocompatibility assessment, at in vitro level were carried out.

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