Effect of aging treatment on the in vitro nickel release from porous oxide layers on NiTi

2013 ◽  
Vol 274 ◽  
pp. 266-272 ◽  
Author(s):  
Z. Huan ◽  
L.E. Fratila-Apachitei ◽  
I. Apachitei ◽  
J. Duszczyk
Keyword(s):  
Aging Treatment ◽  
Oxide Layers ◽  
Nickel Release ◽  
Porous Oxide

scholarly journals Mechanical Properties, Corrosion Resistance and Bioactivity of Oxide Layers Formed by Isothermal Oxidation of Ti-6Al-7Nb Alloy

Coatings ◽  
2021 ◽  
Vol 11 (5) ◽  
pp. 505
Author(s):  
Krzysztof Aniołek ◽  
Bożena Łosiewicz ◽  
Julian Kubisztal ◽  
Patrycja Osak ◽  
Agnieszka Stróż ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Corrosion Resistance ◽  
Contact Potential Difference ◽  
Isothermal Oxidation ◽  
Potential Method ◽  
Open Circuit ◽  
Kelvin Probe ◽  
Contact Potential ◽  
Oxide Layers

Titanium and its alloys are among the most promising biomaterials for medical applications. In this work, the isothermal oxidation of Ti-6Al-7Nb biomedical alloy towards improving its mechanical properties, corrosion resistance, and bioactivity has been developed. The oxide layers were formed at 600, 700, and 800 °C for 72 h. Scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), 3D profilometry, and microindentation test, were used to characterize microstructure, surface geometrical structure, and the hardness of the diphase (α + β) Ti-6Al-7Nb alloy after oxidation, respectively. In vitro corrosion resistance tests were carried out in a saline solution at 37 °C using the open-circuit potential method and potentiodynamic measurements. Electronic properties in the air were studied using the Scanning Kelvin Probe (SKP) technique. The bioactivity test was conducted by soaking the alkali- and heat-treated samples in simulated body fluid for 7 days. The presence of apatite was confirmed using SEM/EDS and Fourier Transform Infrared Spectroscopy (FTIR) studies. The thickness of oxide layers formed increased with the temperature growth from 0.25 to 5.48 µm. It was found that with increasing isothermal oxidation temperature, the surface roughness, hardness, corrosion resistance, and contact potential difference increased. The Ti-6Al-7Nb alloy after oxidation revealed the HAp-forming ability in a biological environment.

Growth of aluminum-free porous oxide layers on titanium and its alloys Ti-6Al-4V and Ti-6Al-7Nb by micro-arc oxidation

2014 ◽  
Vol 41 ◽  
pp. 343-348 ◽  
Author(s):  
Laís T. Duarte ◽  
Claudemiro Bolfarini ◽  
Sonia R. Biaggio ◽  
Romeu C. Rocha-Filho ◽  
Pedro A.P. Nascente
Keyword(s):  
Oxide Layers ◽  
Micro Arc Oxidation ◽  
Porous Oxide

Preparation of porous oxide layers by oxygen bubble templated anodic deposition followed by galvanic displacement

2017 ◽  
Vol 253 ◽  
pp. 11-20 ◽  
Author(s):  
Nicola Comisso ◽  
Lidia Armelao ◽  
Sandro Cattarin ◽  
Paolo Guerriero ◽  
Luca Mattarozzi ◽  
...  
Keyword(s):  
Galvanic Displacement ◽  
Oxide Layers ◽  
Oxygen Bubble ◽  
Porous Oxide ◽  
Anodic Deposition

Effective inhibition of nickel release by tantalum-implanted TiNi alloy and its cyto-compatibility evaluation in vitro

2010 ◽  
Vol 46 (8) ◽  
pp. 2529-2535 ◽  
Author(s):  
Tingting Zhao ◽  
Ruxin Yang ◽  
Chen Zhong ◽  
Yan Li ◽  
Yan Xiang
Keyword(s):  
Tini Alloy ◽  
Nickel Release ◽  
Effective Inhibition

scholarly journals Corrosion Behavior of Anodic Self-Ordered Porous Oxide Layers on Stainless Steel

2021 ◽  
Vol 168 (2) ◽  
pp. 021507
Author(s):  
Lucia Helena Prado ◽  
Evangelia Anastasiou ◽  
Sannakaisa Virtanen
Keyword(s):  
Stainless Steel ◽  
Corrosion Behavior ◽  
Oxide Layers ◽  
Porous Oxide ◽  
Ordered Porous

scholarly journals A Two-Step Approach to Tune the Micro and Nanoscale Morphology of Porous Niobium Oxide to Promote Osteointegration

Materials ◽  
2022 ◽  
Vol 15 (2) ◽  
pp. 473
Author(s):  
Paolo Canepa ◽  
Giuseppe Firpo ◽  
Elena Gatta ◽  
Roberto Spotorno ◽  
Paolo Giannoni ◽  
...  
Keyword(s):  
Niobium Oxide ◽  
Compositional Analysis ◽  
Homogeneous Distribution ◽  
Acid Etching ◽  
Oxide Surface ◽  
In Vitro Tests ◽  
Oxide Layers ◽  
Modification Process ◽  
Subsequent Acid

We present a two-step surface modification process to tailor the micro and nano morphology of niobium oxide layers. Niobium was firstly anodized in spark regime in a Ca- and P-containing solution and subsequently treated by acid etching. The effects of anodizing time and applied potential on the surface morphology is investigated with SEM and AFM, complemented by XPS compositional analysis. Anodizing with a limiting potential of 250 V results in the fast growth of oxide layers with a homogeneous distribution of micro-sized pores. Cracks are, however, observed on 250 V grown layers. Limiting the anodizing potential to 200 V slows down the oxide growth, increasing the anodizing time needed to achieve a uniform pore coverage but produces fracture-free oxide layers. The surface nano morphology is further tuned by a subsequent acid etching process that leads to the formation of nano-sized pits on the anodically grown oxide surface. In vitro tests show that the etching-induced nanostructure effectively promotes cell adhesion and spreading onto the niobium oxide surface.

scholarly journals Evaluation of the Bonding Strength between Various Dental Zirconia Models and Human Teeth for Dental Posts through In Vitro Aging Tests

Coatings ◽  
2021 ◽  
Vol 11 (9) ◽  
pp. 1017
Author(s):  
Shih-Chieh Lin ◽  
Wei-Chun Lin ◽  
Tai-Chia Hu ◽  
Min Yan ◽  
Cheng-Ming Tang
Keyword(s):  
Surface Roughness ◽  
Surface Morphology ◽  
Bond Strength ◽  
Bonding Strength ◽  
Aging Treatment ◽  
Cylindrical Body ◽  
Surface Characteristics ◽  
Light Transmittance ◽  
Human Teeth

In dentistry, root canal treatment reduces support of the tooth, making it necessary to insert a cylindrical body into the treated tooth to strengthen the crown. In the past, metal or fiberglass was often used. However, metal is too different in color from teeth, so the esthetics are poor, and fiberglass is not as strong as metal. Therefore, an alternative is zirconia, which has the characteristics of high light transmittance, esthetics, good biocompatibility, and high breaking strength. The surface morphology and composition of zirconia ceramics are the key to their bond strength with teeth. Therefore, in this study, the surface characteristics of different brands of zirconia commonly used in clinical practice were evaluated in terms of their surface morphology and surface elements. The surface was modified by sandblasting, and its effect on the bonding strength was discussed. Finally, the stability of the material was evaluated through artificial aging. The results showed that the surface roughness of the zirconia specimens increased after sandblasting, whereas the surface microhardness decreased. The shear test results showed that the 3D shape of the zirconia surface could help improve the bonding strength. The bonding strength of DeguDent increased the most after sandblasting. After 20,000 cycles of aging treatment, the shear strength of each specimen decreased. Field emission scanning electron microscopy results showed that the adhesive remained intact on the surface of zirconia, indicating that adhesion failure occurred between the adhesive and the teeth. This confirms that sandblasting can improve the bonding strength of zirconia. Based on the results obtained, it was concluded that the surface roughness of zirconia is the main factor affecting the bond strength.

Influence of pH Level and Type of Archwire on the Time Bound Release of Nickel Ions from Orthodontic Appliances - An In Vitro Study

2021 ◽  
Vol 10 (29) ◽  
pp. 2162-2165
Author(s):  
Azhar Mohammed ◽  
Crystal Runa Soans ◽  
Shivananda S. ◽  
Yatishkumar S. Joshi ◽  
Junaid Junaid ◽  
...  
Keyword(s):  
Stainless Steel ◽  
Metal Ions ◽  
Artificial Saliva ◽  
Orthodontic Appliances ◽  
Ion Release ◽  
Nickel Ions ◽  
Clinical Scenarios ◽  
Nickel Release ◽  
Oral Environment

BACKGROUND Orthodontic metallic appliances in the oral cavity are constantly in contact with biological fluids or tissues thereby releasing particulate masses. They can be common causes of contact allergies and should be considered as a critical issue in determining properties of biomaterials. Nickel ions in various forms and compounds have been known to cause carcinogenic, mutagenic, cytotoxic and allergenic reactions. Pattern of metal ions released from different stainless steel orthodontic appliances in vitro could provide valuable information to consider their application in clinical scenarios. The purpose of the present study was to evaluate metal ions released under different ph levels, immersion period time and using different archwire orthodontic appliances. METHODS Orthodontic appliances were constructed consisting of five brackets from central incisor to the second premolar, a buccal tube welded molar band and an archwire that were used as samples. Total of twelve appliances were constructed; using stainless steel, Ni - Ti, and Thermal Ni - Ti wires (N = 4 each). Half of these samples were immersed in artificial saliva at pH 3.5 and the other half were immersed in artificial saliva at pH 6.75. The samples were stored in an incubator at a temperature of 37 degrees Celsius. Saliva samples from these bottles were collected at the end of 1, 7, 14 and 28 days and subjected to spectrophotometric analysis for estimation of nickel content. RESULTS Nickel release was maximum during the first week of immersion from orthodontic appliances comprising of Ni - Ti wires compared to Stainless steel and thermal Ni - Ti. A gradual decline in the nickel release was observed in the subsequent weeks. Ion release was increased by 30 times in the acidic pH medium, as compared to neutral pH conditions. CONCLUSIONS There is a definite release of nickel ions from orthodontic appliances when exposed to oral environment; however, the amounts are much lower than the daily dietary intake and don’t pose risk of toxicity. Care should be taken in patients with nickel hypersensitivity and wires such as beta - titanium or epoxy coated wires can be substituted. As there is an increase in ion release under acidic conditions the patients need to maintain hygienic oral environment thereby limiting corrosion of appliances. KEY WORDS NitiAlloy, Archwires, pH, Hypersensitivity

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