scholarly journals Electrochemical Deposition of Hydroxyapatite Co-Substituted By Sr/Mg Coating on Ti-6Al-4V ELI Dental Alloy Post-MAO as Anti-Corrosion

2020 ◽  
pp. 2751-2761
Author(s):  
Haider Abdulkareem AlMashhadani ◽  
Khulood Abed Saleh
Keyword(s):  
Adhesion Strength ◽  
Artificial Saliva ◽  
Electrochemical Techniques ◽  
Antimicrobial Properties ◽  
Dental Alloy ◽  
X Ray ◽  
Before And After ◽  
Electrochemically Deposited ◽  
Coated Alloy ◽  
Micro Arc Oxidation

This work involved the co-substitution of the two bioactive ions of strontium and magnesium into the hydroxyapatite (HA) coating which was then electrochemically deposited on Ti-6Al-4V ELI dental alloy (Gr.23) before and after treatment by Micro Arc Oxidation (MAO). The deposited layers were characterized by scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDS), X-ray diffraction (XRD), and Fourier transform infrared spectroscopy (FTIR). The adhesion strength of the coating layer was estimated by using pull-off adhesion test. The adhesion strength of Sr/Mg-HA on the Ti-6Al-4V ELI dental alloy after MAO treatment was 1.79 MPa, which was higher than that before MAO treatment (1.62 MPa). The corrosion behavior of the alloy in artificial saliva environment at temperature ranged 293-323K was assessed by means of electrochemical techniques and potentiodynamic polarization curves. The corrosion protection to the alloy at 293K was increased from 67.98% before treatment by MAO to 75.87% after treatment. The antimicrobial properties of the coated alloy were evaluated against different bacteria and oral fungi (Candida).

Effect of carburizing and annealing processes in improving the Ni/WC–Co adhesion strength

2017 ◽  
Vol 232 (3) ◽  
pp. 338-348 ◽  
Author(s):  
AW Hassan ◽  
MY Noordin ◽  
S Izman ◽  
K Denni
Keyword(s):  
Heat Treatment ◽  
Adhesion Strength ◽  
Positive Impact ◽  
Process Condition ◽  
Scratch Test ◽  
Process Conditions ◽  
X Ray ◽  
Treatment Processes ◽  
Before And After ◽  
Field Emission Electron Microscopy

Heat treatment processes have a positive impact in improving the adhesion strength of different interlayer/substrate materials. However, information regarding the effect of these processes in enhancing the adhesion strength of an electroplated nickel interlayer on tungsten carbide substrate for diamond deposition is lacking. In this study, the effect of carburizing and annealing process conditions in enhancing the adhesion strength of the electroplated nickel interlayer was investigated. The heat treatment processes were designed and modeled by the design of experiments technique. The heat-treated specimens were characterized by the field-emission electron microscopy, energy-dispersive X-ray spectroscopy, and X-ray diffraction techniques. The adhesion of the interlayer before and after the heat treatment was assessed by the scratch test. The results show that the adhesion of the electroplated nickel interlayer was remarkably improved by both processes. The mathematical models for predicting the adhesion strength of the carburized and annealed nickel interlayer within the specified ranges were developed. The maximum adhesion strength of 30 N was obtained from the nickel interlayer annealed at the highest process condition of temperature and time.

scholarly journals Study on the Behavior of Dental Alloy CoCrWNbMoV in Artificial Saliva

2019 ◽  
Vol 70 (1) ◽  
pp. 165-168
Author(s):  
Adrian Alexandru ◽  
Ramona Cimpoesu ◽  
Anca Melian ◽  
Mihaela Salceanu
Keyword(s):  
Corrosion Resistance ◽  
Artificial Saliva ◽  
Dental Materials ◽  
Electrolyte Solutions ◽  
Dental Alloy ◽  
Chemical Dispersion ◽  
X Ray ◽  
Eds Analysis ◽  
Cocrmo Alloys ◽  
Resistance Tests

Dental materials represent an important market worldwide. For solutions that are currently financially acceptable, CoCr or CoCrMo alloys have been an affordable option for all dental technicians. Constant improvements in the properties of this alloy such as corrosion resistance and hardness have been pursued. In this paper are presented some experimental results obtained from the electro-corrosion resistance analysis of the CoCrWNbMoV alloy in two electrolyte solutions made from artificial saplings Afnor and respectively Duffo Quezada. Following electro-corrosion resistance tests, the surface of the alloy was characterized by optical and electron microscopy (OM and SEM) and chemical dispersion X-ray (EDS) analysis.

Electrochemical Behaviour of Co-Cr and Ni-Cr Dental Alloys

2015 ◽  
Vol 227 ◽  
pp. 451-454 ◽  
Author(s):  
Joanna Loch ◽  
Alicja Łukaszczyk ◽  
Joanna Augustyn-Pieniążek ◽  
Halina Krawiec
Keyword(s):  
Artificial Saliva ◽  
Low Cost ◽  
Electrochemical Behaviour ◽  
Electrochemical Techniques ◽  
Orthopedic Implants ◽  
Dental Alloys ◽  
X Ray ◽  
Mechanical And Tribological Properties ◽  
Ceramic Restorations

The purpose of this paper was to study the corrosion resistance of Co-Cr and Ni-Cr dental alloys in simulated artificial saliva by means of electrochemical techniques. Co and Ni based alloys are widely used in dental skeletal structures and orthopedic implants such as screws, pins and plater. And recently they have been applied for making stents. The advantages of these alloys include low cost of casting, matching thermal expansion coefficient with the ceramics of metal-ceramic restorations, and acceptable mechanical and tribological properties in vivo. The microstructure of investigated alloys were studied by using optical microscopic observation, X-ray diffraction measurements and Scanning Electron Microscope with X-ray microanalyzer. The mechanical properties were characterized by microhardness tests.

scholarly journals Fluoride and Functionalized β-tricalcium Phosphate (fTCP) Fluoride Toothpaste Affect the Primary Dentin Caries Surface: A Comparison by Estimation Statistics

2021 ◽  
Vol 16 (1) ◽  
pp. 57-67
Author(s):  
Trieu Kim Ly ◽  
Thoai Quoc Kieu ◽  
Nam Cong-Nhat Huynh ◽  
Lan Thi Quynh Ngo
Keyword(s):  
Artificial Saliva ◽  
Comparison Analysis ◽  
Sem Images ◽  
X Ray ◽  
Fluoride Toothpaste ◽  
Cavity Bottom ◽  
Dentin Caries ◽  
Before And After ◽  
The Mean ◽  
Deep Lesion

This study aims to compare the effect of fTCP-contained toothpaste in combination with 950 ppm fluoride on primary dentin caries surface to ordinary 1100 ppm fluoride toothpaste by using estimation statistics. Dental caries with deep lesion and dentin exposure from nine primary teeth were cut into two equal parts and randomly divided into two groups in a before-after study. Each group was brushed with one type of toothpaste two times per day for 28 days and rested in artificial saliva. SEM images of cavity bottom surfaces and energy-dispersive X-ray spectrometry (EDX) were used to determine the percentage of calcium (Ca), phosphorus (P), fluoride (F) and oxygen (O) at six continuous measured areas from the surface of the cavity bottom into 45 µm depth before and after brushing. About 95% confidence interval of the mean difference was calculated by performing bootstrap resampling with 5000 resamples followed by comparison analysis. The percentage of Ca, P, F, O was shifted after treatment. There was no difference between the two groups. The SEM images reflected a similar illustration of EDX data. The combination of fTCP and 950 ppm fluoride in toothpaste showed equivalent effectiveness to the 1100 ppm fluoride toothpaste in primary dentin caries.

scholarly journals Influence of Sandblasting Process on Tribological Properties of Titanium Grade 4 in Artificial Saliva for Dentistry Applications

Materials ◽  
2021 ◽  
Vol 14 (24) ◽  
pp. 7536
Author(s):  
Patrycja Osak ◽  
Joanna Maszybrocka ◽  
Maciej Zubko ◽  
Jan Rak ◽  
Sylwia Bogunia ◽  
...  
Keyword(s):  
Residual Stress ◽  
Dental Implants ◽  
Artificial Saliva ◽  
Stress Test ◽  
Wear Test ◽  
Polished Surface ◽  
X Ray ◽  
Wear And Friction ◽  
Before And After ◽  
Titanium Grade

Titanium Grade 4 (Ti G4) is widely used in medicine for dental implants. The failure-free life of implants depends on their properties such as resistance to wear and friction processes. This paper presents an analysis of the influence of sandblasting on tribological wear of commercial dental implants made of TiG4 in artificial saliva. Tribological wear measurements were performed in a reciprocating motion in the ball-on-disc system. The scanning electron microscopy/energy-dispersive X-ray spectroscopy (SEM/EDS) method was used to characterize the surface of the implants before and after the tribological wear test. The microhardness of Ti G4 was measured before and after sandblasting by the Vickers method. The contact angle was determined by the method of sitting drop in air. The residual stress test using the X-Ray Diffraction (XRD) single-{hkl} sin2ψ method was carried out. The compressive residual stress of 324(7) MPa and surface hardening of Ti G4 was revealed after sandblasting with Al2O3 particles of 53–75 μm in diameter. It was found that sandblasting changes the surface wettability of Ti G4. The intermediate wettability of the mechanically polished surface and the hydrophobicity of the sandblasted surface was revealed. Sandblasting reduces the tribological wear and friction coefficient of Ti G4 surface in saliva. The three-body abrasion wear mechanism was proposed to explain the tribological wear of Ti G4 in saliva.

scholarly journals The Antimicrobial Properties of Modified Pharmaceutical Bentonite with Zinc and Copper

Pharmaceutics ◽  
2021 ◽  
Vol 13 (8) ◽  
pp. 1190
Author(s):  
Fotini Martsouka ◽  
Konstantinos Papagiannopoulos ◽  
Sophia Hatziantoniou ◽  
Martin Barlog ◽  
Giorgos Lagiopoulos ◽  
...  
Keyword(s):  
Antimicrobial Properties ◽  
Chemical Properties ◽  
Mineralogical Composition ◽  
X Ray Diffraction ◽  
Modified Bentonite ◽  
X Ray ◽  
Before And After ◽  
Antimicrobial Protection ◽  
Main Component ◽  
Phosphate Buffered Saline

Pharmaceutical grade bentonite, containing a high amount of montmorillonite, enriched with zinc (Zn) or copper (Cu) (ZnBent and CuBent, respectively) was used as the main component for the creation of formulations for cutaneous use and tested for their antimicrobial capacity. Bentonite (Bent) with added phenoxyethanol (PH) as a preservative and unmodified bentonite were used as control groups. The mineralogical composition, structural state, and physical or chemical properties, before and after the modification of the samples, were characterized utilizing X-ray Diffraction Analysis (XRD), Fourier-Transform Infrared Spectroscopy (FTIR) and X-ray Fluorescence (XRF) techniques, and Scanning Electron Microscope-Energy Dispersive Spectroscopy (SEM, SEM-EDS) analyses. In addition, the profile of zinc and copper concentration from two types of surfaces ZnBent and CuBent, and into Phosphate-Buffered Saline (PBS) are discussed. Finally, the formulations in the form of basic pastes were challenged against bacteria, molds, and yeasts, and their performance was evaluated based on the European Pharmacopeia criteria. The Cu-modified bentonite performed excellently against bacteria and yeasts, while the Zn-modified bentonite only showed great results against yeasts. Therefore, Cu-modified bentonite formulations could offer antimicrobial protection without the use of preservatives.

Properties of Anodic Coatings Obtained in an Organic, Environmental Electrolyte by Micro Arc Oxidation on Magnesium Alloy

2011 ◽  
Vol 189-193 ◽  
pp. 1001-1004
Author(s):  
Rong Fa Zhang ◽  
Shu Fang Zhang ◽  
Jian Chao Gong ◽  
Wen Long Liu ◽  
He Jing Zhou ◽  
...  
Keyword(s):  
Corrosion Resistance ◽  
Magnesium Alloy ◽  
Phytic Acid ◽  
Immersion Test ◽  
X Ray Diffraction ◽  
X Ray ◽  
Before And After ◽  
Micro Arc Oxidation ◽  
Coating Formation ◽  
Edx Analyses

In a solution containing 10g/L NaOH and 12g/L phytic acid, anodic coatings were obtained by micro arc oxidation (MAO) on AZ91HP magnesium alloy. The morphology, structure and composition of anodic coatings were investigated by scanning electron microscope (SEM), X-ray diffraction (XRD) and energy dispersive X-ray (EDX). The corrosion resistance of magnesium alloy before and after MAO treatment was evaluated by immersion test and potentiodynamic polarization testing in 3.5wt. % NaCl solution. The coatings were evenly formed on the substrate and mainly composed of MgO. EDX analyses showed that phytic acid took part in the coating formation. Compared with the substrate, the corrosion resistance of magnesium alloy after MAO treatment was improved considerably.

Evaluation of Freezing Methods by Low Temperature X-Ray Diffraction

1977 ◽  
Vol 35 ◽  
pp. 330-333
Author(s):  
T. Gulik-Krzywicki ◽  
M.J. Costello
Keyword(s):  
Biological Materials ◽  
Molecular Organization ◽  
X Ray Diffraction ◽  
Glass Capillary ◽  
X Ray ◽  
Rate Dependent ◽  
Before And After ◽  
Freeze Etching ◽  
Diffraction Patterns ◽  
Set Up

Freeze-etching electron microscopy is currently one of the best methods for studying molecular organization of biological materials. Its application, however, is still limited by our imprecise knowledge about the perturbations of the original organization which may occur during quenching and fracturing of the samples and during the replication of fractured surfaces. Although it is well known that the preservation of the molecular organization of biological materials is critically dependent on the rate of freezing of the samples, little information is presently available concerning the nature and the extent of freezing-rate dependent perturbations of the original organizations. In order to obtain this information, we have developed a method based on the comparison of x-ray diffraction patterns of samples before and after freezing, prior to fracturing and replication.Our experimental set-up is shown in Fig. 1. The sample to be quenched is placed on its holder which is then mounted on a small metal holder (O) fixed on a glass capillary (p), whose position is controlled by a micromanipulator.

The Precipitation of Si in AlCuSi Thin Films

1973 ◽  
Vol 31 ◽  
pp. 34-35 ◽  
Author(s):  
R. M. Anderson
Keyword(s):  
Electron Microscopy ◽  
Thin Films ◽  
Heat Treatment ◽  
Solid Solution ◽  
Integrated Circuit ◽  
Copper Film ◽  
Solution Concentration ◽  
X Ray ◽  
Silicon Thin Films ◽  
Before And After

Aluminum-copper-silicon thin films have been considered as an interconnection metallurgy for integrated circuit applications. Various schemes have been proposed to incorporate small percent-ages of silicon into films that typically contain two to five percent copper. We undertook a study of the total effect of silicon on the aluminum copper film as revealed by transmission electron microscopy, scanning electron microscopy, x-ray diffraction and ion microprobe techniques as a function of the various deposition methods.X-ray investigations noted a change in solid solution concentration as a function of Si content before and after heat-treatment. The amount of solid solution in the Al increased with heat-treatment for films with ≥2% silicon and decreased for films <2% silicon.

Human Dentine Remineralization Under Non-colagen Materials Action

2017 ◽  
Vol 68 (5) ◽  
pp. 928-932
Author(s):  
Agripina Zaharia ◽  
Viorica Ghisman Plescan ◽  
Elena Maria Anghel ◽  
Viorica Musat
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Artificial Saliva ◽  
Composite Layer ◽  
X Ray ◽  
Micro Raman Spectroscopy ◽  
Agarose Hydrogel ◽  
Human Dentine ◽  
Dentine Surface ◽  
Scanning Electron

The purpose of this work is to induce biomimetic remineralization of acid etched coronal human dentine in artificial saliva (AS) under agarose (A) hydrogel or chitosan (CS)-A hydrogel action. The investigations focused on the morphology, chemical composition and crystalline structure of the new remineralized layers grown onto the etched dentinal surface (R) using scanning electron microscopy coupled with energy dispersive X-ray spectrometry and micro-Raman spectroscopy. Experimental results showed that remineralized layers grown in the presence of A or CS-A hydrogels consist in B-type Ca-deficient hydroxyapatite (HAP). After 7 days treatment into artificial saliva under agarose hydrogel, nanorod-like extrafibrilar HAP crystals randomly self-assembled in a discontinuous layer were formed, while in presence of chitosan-agarose hydrogel a continuous compact CS-HAP composite layer was obtained. The new biomimetic layer (A-CS4) formed after 4 days on dentine surface under A-CS hydrogel has higher crystallinity. Longer exposed (7 days) dentine in the presence of agarose hydrogel shows a higher mineral-to-collagen ratio (A7). Since dentine mineralization increases, the collagen quality factor decreases in succession A-CS4]R]A7. Results show a benefic effect of chitosan on remineralization of etched dentine.

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