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titanium corrosion

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https://www.readbyqxmd.com/read/28510370/titanium-corrosion-implications-for-dental-implants
#1
Rucha Shah, Deepika Shree Lakshmi Penmetsa, Raison Thomas, Dhoom Singh Mehta
Titanium has been considered as one of the most biocompatible metals. Studies testing its corrosion resistance have proposed that the titanium oxide layer formed on the metal surface is lost under certain unavoidable conditions to which it is exposed in the oral environment. This questions its property of corrosion resistance in the oral cavity. Hence, there is a need to understand the mechanisms of corrosion, which can help in the long-term stability and function of implants. Here, we review the possible pathways of corrosion of titanium in the oral cavity, its implications and proposed methods of prevention of corrosion...
December 2016: European Journal of Prosthodontics and Restorative Dentistry
https://www.readbyqxmd.com/read/28503902/electrochemical-and-biocompatibility-examinations-of-high-pressure-torsion-processed-titanium-and-ti-13nb-13zr-alloy
#2
Ivana Dimić, Ivana Cvijović-Alagić, Anton Hohenwarter, Reinhard Pippan, Vesna Kojić, Jelena Bajat, Marko Rakin
The purpose of this study was to estimate the electrochemical behavior and biocompatibility of ultrafine-grained (UFG) commercially pure titanium (CPTi) and Ti-13Nb-13Zr (TNZ) alloy obtained by high-pressure torsion process. Electrochemical behavior of materials in artificial saliva at 37°C was evaluated by potentiodynamic polarization tests and electrochemical impedance spectroscopy (EIS), and the obtained results indicated that UFG TNZ alloy showed corrosion current density (jcorr  = 53 ± 5 nA cm(-2) ) which was 2 times lower compared to coarse-grained (CG) TNZ alloy (jcorr  = 110 ± 12 nA cm(-2) ) and higher corrosion resistance, while UFG CPTi and CPTi showed approximately the same corrosion rate (mean jcorr ∼ 38-40 nA cm(-2) )...
May 15, 2017: Journal of Biomedical Materials Research. Part B, Applied Biomaterials
https://www.readbyqxmd.com/read/28492599/allergic-reaction-to-vanadium-causes-a-diffuse-eczematous-eruption-and-titanium-alloy-orthopedic-implant-failure
#3
Sally Engelhart, Robert J Segal
Allergy as a cause of adverse outcomes in patients with implanted orthopedic hardware is controversial. Allergy to titanium-based implants has not been well researched, as titanium is traditionally thought to be inert. We highlight the case of a patient who developed systemic dermatitis and implant failure after surgical placement of a titanium alloy (Ti6Al4V) plate in the left foot. The hardware was removed and the eruption cleared in the following weeks. The plate and screws were submitted for metal analysis...
April 2017: Cutis; Cutaneous Medicine for the Practitioner
https://www.readbyqxmd.com/read/28482503/degradation-mechanisms-and-future-challenges-of-titanium-and-its-alloys-for-dental-implant-applications-in-oral-environment
#4
REVIEW
A Revathi, Alba Dalmau Borrás, Anna Igual Muñoz, Caroline Richard, Geetha Manivasagam
OBJECTIVE: For many decades the failure of titanium implants due to corrosion and wear were approached individually and their synergic effect was not considered. In recent past, developments and understanding of the tribocorrosion aspects have thrown deeper understanding on the failure of implants and this has been reviewed in this article extensively. METHODS: Medline, google scholar and Embase search was conducted to identify studies published between 1993 and 2016 which were related to the analysis of degradation mechanism which the dental implants undergo after implantation...
July 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28480611/corrosion-behavior-of-surface-modifications-on-titanium-dental-implant-in-situ-bacteria-monitoring-by-electrochemical-techniques
#5
Ivan Díaz, Miguel Ángel Pacha-Olivenza, Ricardo Tejero, Eduardo Anitua, Maria Luisa González-Martín, Maria Lorenza Escudero, Maria Cristina García-Alonso
The effects of surface modifications and bacteria on the corrosion behavior of titanium have been studied. Five surface modifications were analyzed: two acid etchings (op V, op N), acid etching + anodic oxidation (op NT), sandblasting + acid etching (SLA), and machined surfaces (mach). The corrosion behavior of the surface modifications was evaluated by following the standard ANSI/AAMI/ISO 10993-15:2000. Cyclic potentiodynamic and potentiostatic anodic polarization tests and ion release by ICP-OES after immersion for 7 days in 0...
May 8, 2017: Journal of Biomedical Materials Research. Part B, Applied Biomaterials
https://www.readbyqxmd.com/read/28476967/in-situ-fabrication-of-zirconium-titanium-nano-composite-and-its-coating-on-ti-6al-4v-for-biomedical-applications
#6
Manickam Chellappa, Uthirapathy Vijayalakshmi
In this study, nanocomposite powder consisting of zirconia and titania (Zr-Ti) have been synthesised by sol-gel method, with the aim of protecting Ti-6Al-4V surface. A simple and low cost electrophoretic deposition (EPD) technique has been employed for coating the nanocomposite material on Ti-6Al-4V. The prepared nanocomposite powder was characterised for its functional groups, phase purity, surface topography by Fourier transform infrared spectroscopy, powder X-ray diffraction and scanning electron microscopy...
February 2017: IET Nanobiotechnology
https://www.readbyqxmd.com/read/28463695/influence-of-the-compliance-of-a-patient-s-body-on-the-head-taper-fixation-strength-of-modular-hip-implants
#7
Annika Krull, Nicholas E Bishop, Niels M Steffen, Frank Lampe, Klaus Püschel, Michael M Morlock
BACKGROUND: The strength of the modular fixation between head and stem taper of total hip replacement implants should be sufficient to minimise relative motion and prevent corrosion at the interface. Intraoperatively the components are assembled by impaction with a hammer. It is unclear whether the effective compliance of the patient's body modifies the strength of the taper interface under impaction assembly. The purpose of this study was to assess the influence of the compliance of the patient's body on the taper fixation strength...
April 25, 2017: Clinical Biomechanics
https://www.readbyqxmd.com/read/28415518/antimicrobial-property-cytocompatibility-and-corrosion-resistance-of-zn-doped-zro2-tio2-coatings-on-ti6al4v-implants
#8
Ruoyun Wang, Xiaojing He, Yuee Gao, Xiangyu Zhang, Xiaohong Yao, Bin Tang
Zn-doped ZrO2/TiO2 porous coatings (Zn-ZrO2/TiO2) were prepared on the surface of titanium alloy (Ti6Al4V) by a hybrid approach of magnetron sputtering and micro-arc oxidation (MAO). The microstructures, phase constituents and elemental states of the coating were investigated by scanning electron microscope (SEM) equipped with energy dispersive spectroscopy (EDS), X-ray diffraction (XRD), and X-ray photoelectron spectroscopy (XPS). The results demonstrate that the Zn-ZrO2/TiO2 coatings are porous and its thickness is approximately 13μm...
June 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28392135/ten-year-cross-sectional-study-of-mechanically-assisted-crevice-corrosion-in-1352-consecutive-patients-with-metal-on-polyethylene-total-hip-arthroplasty
#9
Daniel K Hussey, Brian J McGrory
BACKGROUND: Mechanically assisted crevice corrosion (MACC) in metal-on-polyethylene total hip arthroplasty (THA) is of concern, but its prevalence, etiology, and natural history are incompletely understood. METHODS: From January 2003 to December 2012, 1352 consecutive THA surgeries using a titanium stem, cobalt-chromium alloy femoral head, and highly cross-linked polyethylene liner from a single manufacturer were performed. Patients were followed at 1-year and 5-year intervals for surveillance, but also seen earlier if they had symptoms...
March 18, 2017: Journal of Arthroplasty
https://www.readbyqxmd.com/read/28384526/biomineralisation-with-saos-2-bone-cells-on-tisin-sputtered-ti-alloys
#10
Anusha Thampi V V, Avi Bendavid, P J Martin, Vijay Vaithilingam, Penelope A Bean, Margaret D M Evans, B Subramanian
Surface modifications of metallic implants are important in order to protect the underlying metals from the harsh corrosive environment inside the human body and to minimize the losses caused by wear. Recently, researches are carried out in developing bioactive surfaces on metallic implants, which supports the growth and proliferation of cells on to these surfaces. Titanium silicon nitride (TiSiN) hard nanocomposites thin films were fabricated on Ti alloys (Ti-6Al-4V) by pulsed direct current (DC) reactive magnetron sputtering...
March 18, 2017: Colloids and Surfaces. B, Biointerfaces
https://www.readbyqxmd.com/read/28374679/in-vitro-study-of-electrodeposited-fluoridated-hydroxyapatite-coating-on-g-ii-titanium-with-a-nanostructured-tio2-interlayer
#11
Jin-Shyong Lin, Tzung-Bau Tsai, Wen-Ching Say, Chun Chiu, Shih-Hsun Chen
Titanium and its alloys have been widely used as orthopedic and dental implants for several decades due to their superior mechanical properties, corrosion resistance and biocompatibility. Recently, many researches revealed that the hydroxyapatite coatings on biomedical materials can further improve their biocompatibility and bioactivity. However, hydroxyapatite coatings are easily decomposed, weakening the bonding between implants and bone tissues and resulting in a high dissolution rate in the biological environment...
April 4, 2017: Biomedical Materials
https://www.readbyqxmd.com/read/28364905/memotain-a-cad-cam-nickel-titanium-lingual-retainer
#12
Neal D Kravitz, Dan Grauer, Pascal Schumacher, Yong-Min Jo
Approximately 1/2 of maxillary and 1/5 of mandibular multi-stranded lingual retainers fail during retention in some form, either bond failure or wire breakage. Memotain is a new CAD/CAM fabricated lingual retainer wire made of custom-cut nickel-titanium, as an alternative to multi-stranded lingual retainers. It offers numerous perceived advantages to the traditional multi-stranded stainless steel wire, including precision fit, avoidance of interferences, corrosion resistance and even the potential for minor tooth movement as an active lingual retainer...
April 2017: American Journal of Orthodontics and Dentofacial Orthopedics
https://www.readbyqxmd.com/read/28349700/fast-corroding-thin-magnesium-coating-displays-antibacterial-effects-and-low-cytotoxicity
#13
Sarah Zaatreh, David Haffner, Madlen Strauß, Katharina Wegner, Mareike Warkentin, Claudia Lurtz, Christiane Zamponi, Wolfram Mittelmeier, Bernd Kreikemeyer, Regine Willumeit-Römer, Eckhard Quandt, Rainer Bader
Bacterial colonisation and biofilm formation are characteristics of implant-associated infections. In search of candidates for improved prosthetic materials, fast corroding Mg-based coatings on titanium surfaces were examined for their cytotoxic and antimicrobial properties. Human osteoblasts and Staphylococcus epidermidis were each cultured on cylindrical Ti samples coated with a thin layer of Mg/Mg45Zn5Ca, applied via magnetron sputtering. Uncoated titanium samples served as controls. S. epidermidis was quantified by counting colony forming units...
April 2017: Biofouling
https://www.readbyqxmd.com/read/28342752/chitosan-doped-hybrid-tio2-nanocomposite-based-sol-gel-coating-for-the-corrosion-resistance-of-aluminum-metal-in-3-5-nacl-medium
#14
Balaji J, Sethuraman M G
The study outlines the role of chitosan, a biopolymer on corrosion behavior of Hy/nano-TiO2 based sol-gel coating over aluminum metal. In this study organic-inorganic hybrid sols were synthesized through hydrolysis and condensation of 3-glycidoxypropyltrimethoxy silane (GPTMS), tetraethoxysilane (TEOS) and titanium (IV) isopropoxide (TIP) in acidic solution. Chitosan was doped into sol-gel matrix and self-assembled over aluminum substrate. The resultant chitosan-doped-Hy/nano-TiO2 sol-gel coating was characterized by Fourier Transform Infrared (FT-IR) spectra, Raman spectroscopy, X-ray photoelectron spectroscopy (XPS), Scanning Electron Microscopy (SEM), Atomic Force Microscopy (AFM) and Energy-Dispersive X-ray Spectroscopy (EDX) analyses...
March 22, 2017: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/28337912/nanostructured-nickel-cobalt-titanium-alloy-grown-on-titanium-substrate-as-efficient-electrocatalyst-for-alkaline-water-electrolysis
#15
Pandian Ganesan, Arumugam Sivanantham, Sangaraju Shanmugam
One of the important challenges in alkaline water electrolysis is to utilize a bifunctional catalyst for both hydrogen evolution (HER) and oxygen evolution (OER) reactions to increase the efficiency of water splitting devices for the long durable operations. Herein, nickel-cobalt-titanium (NCT) alloy is directly grown on a high corrosion resistance titanium foil by a simple, single, and rapid electrochemical deposition at room temperature. The electrocatalytic activity of NCT alloy electrodes is evaluated for both HER and OER in aqueous electrolyte...
March 30, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28315814/a-closer-look-at-the-in-vitro-electrochemical-characterisation-of-titanium-alloys-for-biomedical-applications-using-in-situ-methods
#16
J-L Wang, R L Liu, T Majumdar, S A Mantri, V A Ravi, R Banerjee, N Birbilis
Titanium (Ti) and its alloys are widely used in several biomedical applications, particularly as permanent orthopaedic implants. Electrochemical testing provides a means to perform accelerated corrosion testing, however whilst results from polarisation testing for Ti and its alloys to date have been generally useful, they are also rather limited on the basis of several reasons. One reason is that the polarisation curves for Ti and its alloys in simulated body fluids all appear rather similar, and they do not present a classical 'breakdown' or pitting potential, making discrimination between alloys difficult...
March 16, 2017: Acta Biomaterialia
https://www.readbyqxmd.com/read/28297095/adverse-reactions-to-orthodontic-materials
#17
I Sifakakis, T Eliades
Adverse effects can arise from the clinical use of orthodontic materials, due to the release of constituent substances (ions from alloys and monomers, degradation by-products, and additives from polymers). Moreover, intraoral aging affects the biologic properties of materials. The aim of this review is to present the currently identified major adverse effects of the metallic and polymeric components found in orthodontic appliances and materials. Corrosion in metallic orthodontic attachments releases metal ions, mainly iron, chromium, and nickel...
March 2017: Australian Dental Journal
https://www.readbyqxmd.com/read/28294119/low-cost-and-durable-bipolar-plates-for-proton-exchange-membrane-electrolyzers
#18
P Lettenmeier, R Wang, R Abouatallah, B Saruhan, O Freitag, P Gazdzicki, T Morawietz, R Hiesgen, A S Gago, K A Friedrich
Cost reduction and high efficiency are the mayor challenges for sustainable H2 production via proton exchange membrane (PEM) electrolysis. Titanium-based components such as bipolar plates (BPP) have the largest contribution to the capital cost. This work proposes the use of stainless steel BPPs coated with Nb and Ti by magnetron sputtering physical vapor deposition (PVD) and vacuum plasma spraying (VPS), respectively. The physical properties of the coatings are thoroughly characterized by scanning electron, atomic force microscopies (SEM, AFM); and X-ray diffraction, photoelectron spectroscopies (XRD, XPS)...
March 15, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28282634/in-situ-preparation-of-scholzite-conversion-coatings-on-titanium-and-ti-6al-4v-for-biomedical-applications
#19
Bing Liu, Xiao-Ming Shi, Gui-Yong Xiao, Yu-Peng Lu
A scholzite (CaZn2(PO4)2·2H2O) coating was prepared in situ on commercially pure titanium (cpTi) and Ti-6Al-4V (Ti64) substrates using the chemical conversion technology, and its phase composition and microstructure, as well as mechanical, chemical and biological properties were investigated to explore potential applications as a bioactive coating on bone implants. It is indicated that the coating consists mainly of monoclinic scholzite crystals with nano-thick laminar morphology. The crystals on cpTi aggregate to flower-like particles with the diameter of 5-10μm, while form a network structure homogeneously on Ti64...
May 1, 2017: Colloids and Surfaces. B, Biointerfaces
https://www.readbyqxmd.com/read/28276196/preparation-and-characterization-of-alloys-of-the-ti-15mo-nb-system-for-biomedical-applications
#20
J R S Martins Júnior, A A Matos, R C Oliveira, M A R Buzalaf, I Costa, L A Rocha, C R Grandini
In the development of new metallic biomaterials, the Ti-15Mo alloy has great prominence because of its excellent corrosion resistance and good combination of mechanical properties. In this study, the element niobium was added to the Ti-15Mo alloy, forming the Ti-15Mo-Nb system for the purpose of improving their properties and promoting its application as a biomaterial. These alloys are very promising to use as biomedical implants, because they integrate a new class of titanium alloys without the presence of aluminum and vanadium, which may cause cytotoxic effects...
March 9, 2017: Journal of Biomedical Materials Research. Part B, Applied Biomaterials
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