scholarly journals Nickel-Catcher-Doped Zwitterionic Hydrogel Coating on Nickel–Titanium Alloy Toward Capture and Detection of Nickel Ions

2021 ◽  
Vol 9 ◽  
Author(s):  
Xiaoyi Fu ◽  
Xi Liu ◽  
Dezhao Hao ◽  
Wuyi Xiao ◽  
Qiong Nie ◽  
...  
Keyword(s):  
Medical Devices ◽  
Niti Alloy ◽  
Nickel Titanium ◽  
Cytotoxic Activities ◽  
Ion Leakage ◽  
Nickel Ion ◽  
Nickel Ions ◽  
Potential Possibility ◽  
Bacteria Adhesion ◽  
Chelation Reaction

Nickel–titanium (NiTi) alloys show broad applicability in biomedical fields. However, the unexpected aggregation of bacteria and the corrosion of body fluid on NiTi-based medical devices often lead to the leakage of nickel ions, resulting in inevitable allergic and cytotoxic activities. Therefore, the capture and detection of nickel ions are important to avoid serious adverse reactions caused by NiTi-based medical devices. Herein, we presented a nickel ion capture strategy by the combination of zwitterionic hydrogels as anti-bacteria layers and carbon disulfide (CS2) components as nickel-catchers (Ni-catchers). On the one hand, the hydration layer of zwitterionic hydrogel can efficiently inhibit bacteria adhesion and reduce nickel ions leakage from NiTi corrosion. On the other hand, Ni-catchers can capture leaked nickel ions from NiTi alloy actively by chelation reaction. Therefore, this strategy shows great capabilities in resisting bacteria adhesion and capturing nickel ions, providing the potential possibility for the detection of nickel ion leakage for implantable biomedical materials and devices.

scholarly journals A Critical Appraisal of the Use and Properties of Nickel–Titanium Dental Alloys

Materials ◽  
2021 ◽  
Vol 14 (24) ◽  
pp. 7859
Author(s):  
Petra Močnik ◽  
Tadeja Kosec
Keyword(s):  
Metal Ions ◽  
Human Body ◽  
Niti Alloy ◽  
Nickel Titanium ◽  
Stable Steady State ◽  
Corrosion Properties ◽  
Nickel Ions ◽  
Corrosion Resistant Alloy ◽  
Subsequent Effect ◽  
Niti Wires

Nickel–titanium (NiTi) archwires are used in dentistry for orthodontic treatment. NiTi alloys have favourable mechanical characteristics, such as superelasticity and shape memory, and are also known as a corrosion-resistant alloy. In specific cases, an archwire could be attacked by certain types of corrosion or wear degradation, which can cause the leaching of metal ions and a hypersensitive response due to increased concentrations of Ni in the human body. A systematic search of the literature retrieved 102 relevant studies. The review paper focuses on three main fields: (i) electrochemical properties of NiTi wires and the effect of different environments on the properties of NiTi wires (fluoride and low pH); (ii) tribocorrosion, a combination of chemical and mechanical wear of the material, and (iii) the biocompatibility of NiTi alloy and its subsequent effect on the human body. The review showed that corrosion properties are affected by microstructure, pH of saliva and the presence of fluorides. A high variation in published results should be, therefore, interpreted with care. The release of nickel ions was assessed using the same unit, showing that the vast majority of metal ions were released in the first few days of exposure, then a stable, steady state was reached. In tribocorrosion studies, the increased concentrations of Ni ions were reported.

scholarly journals Differences in nickel ions released from nickel-titanium arch wire after immersion in detergent and non-detergent toothpaste

2021 ◽  
Vol 6 (2) ◽  
pp. 77
Author(s):  
Hilda Fitria Lubis ◽  
Kholidina Imanda Harahap ◽  
Nadia Tamari Lubis
Keyword(s):  
Inductively Coupled Plasma ◽  
Nickel Titanium ◽  
The Body ◽  
Ion Release ◽  
Nickel Ion ◽  
Nickel Ions ◽  
Whitney Test ◽  
Inductively Coupled ◽  
A Value ◽  
Significant Difference

Nickel-titanium (NiTi) arch wire has properties that favor its use during the leveling and aligning phase of orthodontic treatment. This NiTi orthodontic arch wire has the potential to experience nickel ion release. One factor that can cause the release of nickel ions is toothpaste. Nickel ions released can enter the body and cause carcinogenic, mutagenic, cytotoxic, and allergic effects. The purpose of this study was to see the differences of nickel ions released from NiTi orthodontic arch wire after immersion in detergent and non-detergent toothpaste. This was a laboratory experimental research to draft a comparative design. The sample size was 40 pieces of NiTi orthodontic arch wire which were divided into 2 groups, immersion in detergent toothpaste and immersion in non-detergent toothpaste. The sample used was NiTi arch wire solution immersed in toothpaste and distilled water for 24 hours in an incubator at 37 °C then measured using inductively coupled plasma (ICP) mass spectrometer to determine the released nickel ions. Data were analyzed usingMann-Whitney test. The Mann-Whitney test resulted in a value of 0.872 (p≥0.05) which indicates no significant difference between the two groups. The study concluded that there is no difference in the nickel ions released from NiTi orthodonticarchwire after immersion in detergent and non-detergent toothpaste.

scholarly journals An evaluation of two types of nickel-titanium wires in terms of micromorphology and nickel ions’ release following oral environment exposure

2015 ◽  
Vol 16 (1) ◽  
Author(s):  
Abdul Razzak A Ghazal ◽  
Mohammad Y Hajeer ◽  
Rabab Al-Sabbagh ◽  
Ibrahim Alghoraibi ◽  
Ahmad Aldiry
Keyword(s):  
Nickel Titanium ◽  
Nickel Ions ◽  
Environment Exposure ◽  
Oral Environment

STUDY OF NICKEL ION RELEASE IN SIMULATED BODY FLUID FROM C+-IMPLANTED NICKEL TITANIUM ALLOY

2016 ◽  
Vol 23 (05) ◽  
pp. 1650045 ◽  
Author(s):  
MUHAMMAD AHSAN SHAFIQUE ◽  
G. MURTAZA ◽  
SHAHZAD SAADAT ◽  
ZEESHAN ZAHEER ◽  
MUHAMMAD SHAHNAWAZ ◽  
...  
Keyword(s):  
Calcium Phosphate ◽  
Simulated Body Fluid ◽  
Body Fluid ◽  
Niti Alloy ◽  
Niti Shape Memory Alloy ◽  
Ion Release ◽  
Nickel Ion ◽  
Oxidation Layer ◽  
X Ray ◽  
Calcium Phosphate Precipitation

Nickel ion release from NiTi shape memory alloy is an issue for biomedical applications. This study was planned to study the effect of C[Formula: see text] implantation on nickel ion release and affinity of calcium phosphate precipitation on NiTi alloy. Four annealed samples are chosen for the present study; three samples with oxidation layer and the fourth without oxidation layer. X-ray diffraction (XRD) spectra reveal amorphization with ion implantation. Proton-induced X-ray emission (PIXE) result shows insignificant increase in Ni release in simulated body fluid (SBF) and calcium phosphate precipitation up to [Formula: see text][Formula: see text]ions/cm2. Then Nickel contents show a sharp increase for greater ion doses. Corrosion potential decreases by increasing the dose but all the samples passivate after the same interval of time and at the same level of [Formula: see text] in ringer lactate solution. Hardness of samples initially increases at greater rate (up to [Formula: see text][Formula: see text]ions/cm[Formula: see text] and then increases with lesser rate. It is found that [Formula: see text][Formula: see text]ions/cm2 ([Formula: see text] is a safer limit of implantation on NiTi alloy, this limit gives us lesser ion release, better hardness and reasonable hydroxyapatite incubation affinity.

Colloidal particle based electrodeposition coatings on NiTi alloy: Reduced releasing of nickel ions and improved biocompatibility

2018 ◽  
Vol 230 ◽  
pp. 228-231 ◽  
Author(s):  
Long Meng ◽  
Yang Li ◽  
Kai Pan ◽  
Ye Zhu ◽  
Wei Wei ◽  
...  
Keyword(s):  
Colloidal Particle ◽  
Niti Alloy ◽  
Nickel Ions

Polymeric nanoparticles-based multi-functional coatings on NiTi alloy with nickel ion release control, cytocompatibility, and antibacterial performance

2019 ◽  
Vol 43 (3) ◽  
pp. 1551-1561 ◽  
Author(s):  
Long Meng ◽  
Yunan Wu ◽  
Kai Pan ◽  
Ye Zhu ◽  
Xiaojie Li ◽  
...  
Keyword(s):  
Polymeric Nanoparticles ◽  
Niti Alloy ◽  
Antibacterial Properties ◽  
Functional Coatings ◽  
Ion Release ◽  
Nickel Ion ◽  
Antibacterial Performance ◽  
Release Control

Photo-cross-linked quaternized copolymer coatings on NiTi alloy show prominent inhibition of nickel ion release and antibacterial properties.

Determination of Tin and Nickel Content in Pyrophosphate Tin-Nickel Alloy Plating Bath

2011 ◽  
Vol 233-235 ◽  
pp. 214-218
Author(s):  
Qiu Ju Geng ◽  
Xue Wei
Keyword(s):  
Standard Deviation ◽  
Nickel Alloy ◽  
Nickel Content ◽  
Plating Bath ◽  
Nickel Ion ◽  
Nickel Ions ◽  
Alloy Plating ◽  
Total Measurement Error ◽  
Analytical Requirements

Tin and nickel ions are in stable complexing form in Pyrophosphate tin-nickel alloy plating bath, this paper uses back-titration of Zn2+ standard solution to determine total amount of tin and nickel ions, and spectrophotometry to determine content of nickel ions in the bath to study interference and elimination methods of co-existing components. The results show that: eliminate the interference of pyrophosphate by heating the solution to hydrolyse and mask Sn4+ and Fe3+ effectively with triethanolamine, the total measurement error is about 0.91%, standard deviation is 0.0141; The recovery of determination for nickel ion content is 99.13%, and standard deviation is 0.0180; The method i-s simple, fast and is able to meet the analytical requirements for controlling the plating quality.

scholarly journals Nickel Sorption onto Chitosan - Silica Hybrid Aerogel from Aqueous Solution

2021 ◽  
Vol 18 (9) ◽  
Author(s):  
Kelechi EBISIKE ◽  
Afamefuna Elvis OKORONKWO ◽  
Kenneth Kanayo ALANEME
Keyword(s):  
Aqueous Solution ◽  
Hydrochloric Acid ◽  
Agricultural Waste ◽  
Sorption Process ◽  
Ion Concentration ◽  
Nickel Ion ◽  
Nickel Ions ◽  
Sorption System ◽  
Silica Hybrid ◽  
Hybrid Aerogel

The utilization and efficiency of agricultural waste-derived chitosan-silica hybrid aerogel “(CS)hA” on nickel removal from aqueous solution was examined and optimum parameters for pH, contact time, and initial ion concentration were determined during batch sorption system studies. Metal recovery was performed on the adsorbent using separately dilute concentrations of hydrochloric acid, acetic acid, ammonia, and sodium hydroxide solutions as eluents. The results generated were analyzed from kinetic and isotherm studies. The maximum Ni2+ adsorption of 99.78 % was established at 60 min and pH 3 in this study. The batch studies revealed that the percentage of nickel ion removal by the adsorbent decreased along with an increase in the initial Ni2+ ions concentration. The pseudo-second-order, the best fit of the kinetic model, has the values of its correlation coefficient “R2” ranging from 0.9 to 1, whereas the Langmuir model which had the maximum monolayer adsorption capacity of 85.84 mg g-1, was the best isotherm in interpreting the sorption process and the calculated separation factor was higher than 0 but less than 1. Dilute hydrochloric acid (0.1 M) was the best eluent in removing bound nickel ions (55.63 %) from (CS)hA.

scholarly journals Laboratory Rational of Changes in the Crystal Lattice of Nickel-Titanium Endodontic Rotary Files in Autoclaving

2020 ◽  
Vol 2020 ◽  
pp. 1-4 ◽  
Author(s):  
Zurab Khabadze ◽  
Oleg Mordanov ◽  
Mariya Balashova ◽  
Leonid Stolov ◽  
Amaliya Pangratyan ◽  
...  
Keyword(s):  
Crystal Lattice ◽  
Niti Alloy ◽  
Nickel Titanium ◽  
Martensitic Phase ◽  
Cutting Efficiency ◽  
X Ray ◽  
Eds Analysis ◽  
Internal Deformation ◽  
Niti Instruments ◽  
Manufacturing Features

Objectives. The aim of this study was to investigate the changes of the crystal lattice of NiTi instruments after repeated autoclave sterilization cycles based on the results to conclude about the influence of multiple sterilization on the characteristics of ProTaper clinical use. Methods. 21 samples of ProTaper Universal rotary files were divided into 3 groups of 7 samples. After 1, 4, and 7 cycles of sterilization, the samples were observed using еnergy-dispersive X-ray spectroscopy (EDX), X-ray powder diffraction (XRD), and scanning electron microscopy (SEM). Results. EDS analysis confirmed that all samples were composed mainly of nickel and titanium, also Fe (presumably steel), Cr, Co, and Zn were found. The percentage of nickel and titanium was affected by repeated sterilization cycles. The mass fraction of Fe, Co, Zn, and Cr decreased after 1, 4, and 7 sterilization cycles. According to the results of the second study, it was found that, with increasing autoclaving cycles, the percentage of Fe decreased. There were changes in the three obtained diffractograms, which indicated an increase in the number of the martensitic phase and a decrease in austenitic. The cutting efficiency of the ProTaper is also reduced during repeated sterilization cycles, which can be caused by the austenitic and martensitic phase displacement. Conclusion. Manufacturing features and repeated sterilization cycles increase the internal deformation in the structure of NiTi alloy, which increases the risk of fracture.

scholarly journals Structural insights into how GTP-dependent conformational changes in a metallochaperone UreG facilitate urease maturation

2017 ◽  
Vol 114 (51) ◽  
pp. E10890-E10898 ◽  
Author(s):  
Man Hon Yuen ◽  
Yu Hang Fong ◽  
Yap Shing Nim ◽  
Pak Ho Lau ◽  
Kam-Bo Wong
Keyword(s):  
Conformational Changes ◽  
Metal Binding ◽  
Sole Source ◽  
Planar Geometry ◽  
Binding Motif ◽  
Nickel Ion ◽  
Gtp Hydrolysis ◽  
Nickel Ions ◽  
Gtp Binding

The ability of metallochaperones to allosterically regulate the binding/release of metal ions and to switch protein-binding partners along the metal delivery pathway is essential to the metallation of the metalloenzymes. Urease, catalyzing the hydrolysis of urea into ammonia and carbon dioxide, contains two nickel ions bound by a carbamylated lysine in its active site. Delivery of nickel ions for urease maturation is dependent on GTP hydrolysis and is assisted by four urease accessory proteins UreE, UreF, UreG, and UreH(UreD). Here, we determined the crystal structure of the UreG dimer from Klebsiella pneumoniae in complex with nickel and GMPPNP, a nonhydrolyzable analog of GTP. Comparison with the structure of the GDP-bound Helicobacter pylori UreG (HpUreG) in the UreG2F2H2 complex reveals large conformational changes in the G2 region and residues near the 66CPH68 metal-binding motif. Upon GTP binding, the side chains of Cys66 and His68 from each of the UreG protomers rotate toward each other to coordinate a nickel ion in a square-planar geometry. Mutagenesis studies on HpUreG support the conformational changes induced by GTP binding as essential to dimerization of UreG, GTPase activity, in vitro urease activation, and the switching of UreG from the UreG2F2H2 complex to form the UreE2G2 complex with the UreE dimer. The nickel-charged UreE dimer, providing the sole source of nickel, and the UreG2F2H2 complex could activate urease in vitro in the presence of GTP. Based on our results, we propose a mechanism of how conformational changes of UreG during the GTP hydrolysis/binding cycle facilitate urease maturation.

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