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Implant corrosion

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https://www.readbyqxmd.com/read/27923596/revision-hip-arthroplasty-using-a-modular-cementless-femoral-stem-intermediate-term-follow-up
#1
Sureshan Sivananthan, Chin-Tat Lim, Rapeepat Narkbunnam, Alex Sox-Harris, James I Huddleston, Stuart B Goodman
BACKGROUND: Modular femoral stem provides flexibility in femoral reconstruction, ensuring improved "fit and fill". However, there are risks of junction failure and corrosion, as well as cost concerns in the use of modular femoral stems. METHODS: We reviewed prospectively-gathered clinical and radiographic data on revision total hip arthroplasties (THAs) performed from 2001-2007 using modular, cementless femoral component performed by the 2 senior authors. Patients with a minimum follow-up of 7 years were included in this study...
November 2, 2016: Journal of Arthroplasty
https://www.readbyqxmd.com/read/27901227/evaluation-of-cytotoxicity-and-corrosion-resistance-of-orthodontic-mini-implants
#2
Celha Borges Costa Alves, Márcio Nunes Segurado, Miriam Cristina Leandro Dorta, Fátima Ribeiro Dias, Maurício Guilherme Lenza, Marcos Augusto Lenza
Objective: To evaluate and compare in vitro cytotoxicity and corrosion resistance of mini-implants from three different commercial brands used for orthodontic anchorage. Methods: Six mini-implants (Conexão(tm), Neodent(tm) and SIN(tm)) were separately immersed in artificial saliva (pH 6.76) for 30 and 60 days. The cytotoxicity of the corrosion extracts was assessed in L929 cell cultures using the violet crystal and MTT assays, as well as cell morphology under light microscopy...
September 2016: Dental Press Journal of Orthodontics
https://www.readbyqxmd.com/read/27898194/inflammatory-cell-induced-corrosion-in-total-knee-arthroplasty-a-retrieval-study
#3
Arianna Cerquiglini, Johann Henckel, Harry S Hothi, Anna Di Laura, John A Skinner, Alister J Hart
Metal release in patients with joint replacements is associated with local tissue reactions, pain, and ultimately revision of implants. One of the causes of this metal loss is speculated to be due to a mechanism of inflammatory cell-induced corrosion (ICIC). In this knee retrieval study, we aimed to: (1) identify the extent and location of ICI corrosion patterns on our femoral and tibial components and (2) correlate our findings with implant and clinical information. We investigated 28 femoral and 9 tibial components made of polished CoCr for presence of ICIC, using macroscopic and microscopic screening and statistical analyses to identify any significant correlations between our results and clinical information...
November 29, 2016: Journal of Biomedical Materials Research. Part B, Applied Biomaterials
https://www.readbyqxmd.com/read/27897182/design-and-development-of-novel-antibacterial-ti-ni-cu-shape-memory-alloys-for-biomedical-application
#4
H F Li, K J Qiu, F Y Zhou, L Li, Y F Zheng
In the case of medical implants, foreign materials are preferential sites for bacterial adhesion and microbial contamination, which can lead to the development of prosthetic infections. Commercially biomedical TiNi shape memory alloys are the most commonly used materials for permanent implants in contact with bone and dental, and the prevention of infections of TiNi biomedical shape memory alloys in clinical cases is therefore a crucial challenge for orthopaedic and dental surgeons. In the present study, copper has been chosen as the alloying element for design and development novel ternary biomedical Ti‒Ni‒Cu shape memory alloys with antibacterial properties...
November 29, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27894051/the-influence-of-sr-on-the-microstructure-degradation-and-stress-corrosion-cracking-of-the-mg-alloys-zk40xsr
#5
Lianxi Chen, Yuanhong Bin, Wenqi Zou, Xiaojian Wang, Wei Li
In the present work, new magnesium (Mg) alloys (Mg-4Zn-0.6Zr-xSr, x=0, 0.4, 0.8, 1.2, 1.6wt%; ZK40xSr) were prepared and studied as potential biodegradable materials. The influence of strontium (Sr) addition on the properties of the new Mg alloys was investigated, which included microstructure, corrosion degradation, and the stress corrosion cracking (SCC) susceptibility. The average grain size of the ZK40Sr was approximately 100µm, which was significantly smaller than that of ZK40 alloy without Sr (402.3±40...
November 18, 2016: Journal of the Mechanical Behavior of Biomedical Materials
https://www.readbyqxmd.com/read/27888094/nano-analyses-of-wear-particles-from-metal-on-metal-and-non-metal-on-metal-dual-modular-neck-hip-arthroplasty
#6
Zhidao Xia, Benjamin F Ricciardi, Zhao Liu, Christopher von Ruhland, Mike Ward, Alex Lord, Louise Hughes, Steven R Goldring, Edward Purdue, David Murray, Giorgio Perino
Increased failure rates due to metallic wear particle-associated adverse local tissue reactions (ALTR) is a significant clinical problem in resurfacing and total hip arthroplasty. Retrieved periprosthetic tissue of 53 cases with corrosion/conventional metallic wear particles from 285 revision operations for ALTR was selected for nano-analyses. Three major classes of hip implants associated with ALTR, metal-on-metal hip resurfacing arthroplasty (MoM HRA) and large head total hip replacement (MoM LHTHA) and non-metal-on-metal dual modular neck total hip replacement (Non-MoM DMNTHA) were included...
November 22, 2016: Nanomedicine: Nanotechnology, Biology, and Medicine
https://www.readbyqxmd.com/read/27886000/evaluation-of-corrosion-resistance-and-surface-characteristics-of-orthodontic-wires-immersed-in-different-mouthwashes
#7
Didem Nalbantgil, Feyza Ulkur, Gulfeza Kardas, Mustafa Culha
BACKGROUND: Patients use mouthwashes in addition to mechanical cleaning during orthodontic treatment. The effects of mouthwashes on the archwires have not been examined yet. OBJECTIVE: To compare the corrosion resistance of four different arch wires and corrosion effects of different mouthwashes to formulate a biocompatible and mechanically useful arch wire and mouthwash combination. METHODS: Each group comprised of 4 wire samples of 2 cm 0...
November 25, 2016: Bio-medical Materials and Engineering
https://www.readbyqxmd.com/read/27881805/corrosion-resistance-and-biological-activity-of-tio2-implant-coatings-produced-in-oxygen-rich-environments
#8
Rui Zhang, Yi Wan, Xing Ai, Zhanqiang Liu, Dong Zhang
The physical and chemical properties of bio-titanium alloy implant surfaces play an important role in their corrosion resistance and biological activity. New turning and turning-rolling processes are presented, employing an oxygen-rich environment in order to obtain titanium dioxide layers that can both protect implants from corrosion and also promote cell adhesion. The surface topographies, surface roughnesses and chemical compositions of the sample surfaces were obtained using scanning electron microscopy, a white light interferometer, and the Auger electron spectroscopy, respectively...
November 23, 2016: Proceedings of the Institution of Mechanical Engineers. Part H, Journal of Engineering in Medicine
https://www.readbyqxmd.com/read/27881114/hypersensitivity-reactions-to-metal-implants-laboratory-options
#9
Anna Maria Carossino, Christian Carulli, Simone Ciuffi, Roberto Carossino, Giorgia Donata Zappoli Thyrion, Roberto Zonefrati, Massimo Innocenti, Maria Luisa Brandi
BACKGROUND: All implant compounds undergo an electrochemical process when in contact with biological fluids, as well as mechanical corrosion due to abrasive wear, with production of metal debris that may inhibit repair processes. None of the commonly-used methods can diagnose implant allergies when used singly, therefore a panel of tests should be performed on allergic patients as pre-operative screening, or when a postoperative metal sensitisation is suspected. METHODS: We analysed patients with painful prostheses and subjects prone to allergies using the Patch Test in comparison with the Lymphocyte Transformation Test...
November 23, 2016: BMC Musculoskeletal Disorders
https://www.readbyqxmd.com/read/27867108/poly-3-4-ethylenedioxythiophene-graphene-oxide-composite-coatings-for-controlling-magnesium-implant-corrosion
#10
Kasey Catt, Huaxiu Li, X Tracy Cui
: Magnesium (Mg) is a promising biodegradable implant material because of its appropriate mechanical properties and safe degradation products. However, in vivo corrosion speed and hydrogen gas production need to be controlled for uses in biomedical applications. Here we report the development of a conducting polymer 3,4-ethylenedioxythiphene (PEDOT) and graphene oxide (GO) composite coating as a corrosion control layer. PEDOT/GO was electropolymerized on Mg samples in ethanol media. The coated Mg samples were subjected to various corrosion tests...
November 17, 2016: Acta Biomaterialia
https://www.readbyqxmd.com/read/27860159/evaluation-of-corrosion-resistance-of-implant-use-ti-zr-binary-alloys-with-a-range-of-compositions
#11
Teisuke Akimoto, Takeshi Ueno, Yusuke Tsutsumi, Hisashi Doi, Takao Hanawa, Noriyuki Wakabayashi
Although titanium-zirconium (Ti-Zr) alloy has been adopted for clinical applications, the ideal proportion of Zr in the alloy has not been identified. In this study, we investigated the biocompatibility of Ti-Zr alloy by evaluating its corrosion resistance to better understand whether there is an optimal range or value of Zr proportion in the alloy. We prepared pure Ti, Ti-30Zr, Ti-50Zr, Ti-70Zr, and pure Zr (mol% of Zr) samples and subjected them to anodic polarization and immersion tests in a lactic acid + sodium chloride (NaCl) solution and artificial saliva...
November 18, 2016: Journal of Biomedical Materials Research. Part B, Applied Biomaterials
https://www.readbyqxmd.com/read/27858551/increased-levels-of-dissolved-titanium-are-associated-with-peri-implantitis-a-case-control-study
#12
Luciana M Safioti, Georgios A Kotsakis, Alex E Pozhitkov, Whasun O Chung, Diane M Daubert
BACKGROUND: Peri-implantitis represents a disruption of the biocompatible interface between the titanium (Ti) dioxide layer of the implant surface and the peri-implant tissues. Increasing preclinical data suggest that the peri-implantitis microbiota not only triggers an inflammatory immune response but also causes electrochemical alterations of the Ti surfaces, i.e. corrosion, that aggravate this inflammatory response. Thus, we hypothesized that there is an association between the dissolution of titanium from dental implants, which suggests corrosion, and peri-implantitis in humans...
November 18, 2016: Journal of Periodontology
https://www.readbyqxmd.com/read/27848221/mechanical-properties-of-high-entropy-alloy-al0-1cocrfeni-for-peripheral-vascular-stent-application
#13
Karthik Alagarsamy, Aleksandra Fortier, Mageshwari Komarasamy, Nilesh Kumar, Atif Mohammad, Subhash Banerjee, Hai-Chao Han, Rajiv S Mishra
High entropy alloys (HEAs) are new class of metallic materials with five or more principal alloying elements. Due to this distinct concept of alloying, the HEAs exhibit unique properties compared to conventional alloys. The outstanding properties of HEAs include increased strength, superior wear resistance, high temperature stability, increased fatigue properties, good corrosion, and oxidation resistance. Such characteristics of HEAs have generated significant interest among the scientific community. However, their applications are yet to be explored...
December 2016: Cardiovascular Engineering and Technology
https://www.readbyqxmd.com/read/27836578/will-new-metal-heads-restore-mechanical-integrity-of-corroded-trunnions
#14
Aditya Derasari, Jonathan E Gold, Sabir Ismaily, Philip C Noble, Stephen J Incavo
BACKGROUND: Metal wear and corrosion from modular junctions in total hip arthroplasty can lead to further unwanted surgery. Trunnion tribocorrosion is recognized as an important contributor to failure. This study was performed to determine if new metal heads restore mechanical integrity of the original modular junction after impaction on corroded trunnions, and assess which variables affect stability of the new interface created at revision total hip arthroplasty. METHODS: Twenty-two trunnions, cobalt-chromium (CoCr) and titanium alloy (TiAIV), (CoCr, n = 12; TiAIV, n = 10) and new metal heads were used, 10 trunnions in pristine condition and 12 with corrosion damage...
October 11, 2016: Journal of Arthroplasty
https://www.readbyqxmd.com/read/27829756/corrosion-resistance-of-stainless-steel-nickel-titanium-titanium-molybdenum-alloy-and-ion-implanted-titanium-molybdenum-alloy-archwires-in-acidic-fluoride-containing-artificial-saliva-an-in-vitro-study
#15
Venith Jojee Pulikkottil, S Chidambaram, P U Bejoy, P K Femin, Parson Paul, Mohamed Rishad
OBJECTIVE: (1) To evaluate the corrosion resistance of four different orthodontic archwires and to determine the effect of 0.5% NaF (simulating high fluoride-containing toothpaste of about 2250 ppm) on corrosion resistance of these archwires. (2) To assess whether surface roughness (Ra) is the primary factor influencing the corrosion resistance of these archwires. MATERIALS AND METHODS: Four different archwires (stainless steel [SS], nickel-titanium [NiTi], titanium molybdenum alloy [TMA], and ion-implanted TMA) were considered for this study...
October 2016: Journal of Pharmacy & Bioallied Sciences
https://www.readbyqxmd.com/read/27782497/biomimetic-coatings-enhance-tribocorrosion-behavior-and-cell-responses-of-commercially-pure-titanium-surfaces
#16
Isabella da Silva Vieira Marques, Maria Fernanda Alfaro, Miki Taketomi Saito, Nilson Cristino da Cruz, Christos Takoudis, Richard Landers, Marcelo Ferraz Mesquita, Francisco Humberto Nociti Junior, Mathew T Mathew, Cortino Sukotjo, Valentim Adelino Ricardo Barão
Biofunctionalized surfaces for implants are currently receiving much attention in the health care sector. Our aims were (1) to create bioactive Ti-coatings doped with Ca, P, Si, and Ag produced by microarc oxidation (MAO) to improve the surface properties of biomedical implants, (2) to investigate the TiO2 layer stability under wear and corrosion, and (3) to evaluate human mesenchymal stem cells (hMSCs) responses cultured on the modified surfaces. Tribocorrosion and cell experiments were performed following the MAO treatment...
August 11, 2016: Biointerphases
https://www.readbyqxmd.com/read/27780765/influence-of-strain-on-the-corrosion-of-magnesium-alloys-and-zinc-in-physiological-environments
#17
Karin Törne, Andreas Örnberg, Jonas Weissenrieder
: During implantation load-bearing devices experience stress that may influence its mechanical and corrosion profile and potentially lead to premature rupture. The susceptibility to stress corrosion cracking (SCC) of the Mg-Al alloy AZ61 and Zn was studied in simulated body fluid (m-SBF) and whole blood by slow strain rate (SSR) testing in combination with electrochemical impedance spectroscopy (EIS) and further ex-situ analysis including scanning electron microscopy (SEM) and Fourier transform infrared spectroscopy...
October 22, 2016: Acta Biomaterialia
https://www.readbyqxmd.com/read/27772708/microstructure-mechanical-properties-bio-corrosion-properties-and-cytotoxicity-of-as-extruded-mg-sr-alloys
#18
Chaoyong Zhao, Fusheng Pan, Lei Zhang, Hucheng Pan, Kai Song, Aitao Tang
In this study, as-extruded Mg-Sr alloys were studied for orthopedic application, and the microstructure, mechanical properties, bio-corrosion properties and cytotoxicity of as-extruded Mg-Sr alloys were investigated by optical microscopy, scanning electron microscopy with an energy dispersive X-ray spectroscopy, X-ray diffraction, tensile and compressive tests, immersion test, electrochemical test and cytotoxicity test. The results showed that as-extruded Mg-Sr alloys were composed of α-Mg and Mg17Sr2 phases, and the content of Mg17Sr2 phases increased with increasing Sr content...
January 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/27772706/in-vitro-studying-corrosion-behavior-of-porous-titanium-coating-in-dynamic-electrolyte
#19
Xuedan Chen, Qingshan Fu, Yongzhong Jin, Mingtian Li, Ruisong Yang, Xuejun Cui, Min Gong
Porous titanium (PT) is considered as a promising biomaterials for orthopedic implants. Besides biocompatibility and mechanical properties, corrosion resistance in physiological environment is the other important factor affecting the long stability of an implant. In order to investigate the corrosion behavior of porous titanium implants in a dynamic physiological environment, a dynamic circle system was designed in this study. Then a titanium-based implant with PT coating was fabricated by plasma spraying. The corrosion resistance of PT samples in flowing 0...
January 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/27770961/corrosion-resistance-characteristics-of-a-ti-6al-4v-alloy-scaffold-that-is-fabricated-by-electron-beam-melting-and-selective-laser-melting-for-implantation-in-vivo
#20
Bingjing Zhao, Hong Wang, Ning Qiao, Chao Wang, Min Hu
The purpose of this study is to determine the corrosion resistance of Ti-6Al-4V alloy fabricated with electron beam melting and selective laser melting for implantation in vivo. Ti-6Al-4V alloy specimens were fabricated with electron beam melting (EBM) and selective laser melting (SLM). A wrought form of Ti-6Al-4V alloy was used as a control. Surface morphology observation, component analysis, corrosion resistance experimental results, electrochemical impedance spectroscopy, crevice corrosion resistance experimental results, immersion test and metal ions precipitation analysis were processed, respectively...
January 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
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