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Implant corrosion

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https://www.readbyqxmd.com/read/29343864/electrochemical-and-friction-characteristics-of-metallic-glass-composites-at-the-microstructural-length-scales
#1
Aditya Ayyagari, Vahid Hasannaeimi, Harpreet Arora, Sundeep Mukherjee
Metallic glass composites represent a unique alloy design strategy comprising of in situ crystalline dendrites in an amorphous matrix to achieve damage tolerance unseen in conventional structural materials. They are promising for a range of advanced applications including spacecraft gears, high-performance sporting goods and bio-implants, all of which demand high surface degradation resistance. Here, we evaluated the phase-specific electrochemical and friction characteristics of a Zr-based metallic glass composite, Zr56...
January 17, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29339190/systemic-and-local-toxicity-of-metal-particles-released-from-hip-prostheses-a-review-of-experimental-approaches
#2
REVIEW
Divya Rani Bijukumar, Abhijith Segu, Júlio Cesar Matias de Souza, XueJun Li, Mark Barba, Louis Mercuri, Joshua Jacobs, Mathew Thoppil Mathew
Despite the technological improvements in orthopedic joint replacement implants, wear and corrosion products associated with the metal components of these implants may result in adverse local tissue and perhaps systemic reactions and toxicities. The current review encompasses a literature review of the local and systemic toxicity studies concerning the effect of CoCrMo wear particles released from wear and corrosion of orthopedic implants and prostheses. Release of metallic debris is mainly in the form of micro- and nano-particles, ions of different valences, and oxides composed of Co and Cr...
January 12, 2018: Nanomedicine: Nanotechnology, Biology, and Medicine
https://www.readbyqxmd.com/read/29338270/effect-of-calcium-on-the-microstructure-and-corrosion-behavior-of-microarc-oxidized-mg-xca-alloys
#3
Yaokun Pan, Chuanzhong Chen, Rui Feng, Hongwei Cui, Benkui Gong, Tingting Zheng, Yarou Ji
Magnesium alloys are potential biodegradable implants for biomedical applications, and calcium (Ca) is one kind of ideal element being examined for magnesium alloys and biodegradable ceramic coatings owing to its biocompatibility and mechanical suitability. In this study, microarc oxidation (MAO) coatings were prepared on Mg-xCa alloys to study the effect of Ca on the microstructure and corrosion resistance of Mg-xCa alloys and their surface MAO coatings. The electrochemical corrosion behavior was investigated using an electrochemical workstation, and the degradability and bioactivity were evaluated by soaking tests in simulated body fluid (SBF) solutions...
January 16, 2018: Biointerphases
https://www.readbyqxmd.com/read/29326508/effect-of-ultraviolet-irradiation-on-the-osseointegration-of-a-titanium-alloy-with-bone
#4
Ashish Yadav, Ranjana Yadav, Aratee Gupta, Akash Baranwal, Atul Bhatnagar, Vakil Singh
Introduction: Attempt has been made to analyze the potential of titanium (Ti) alloy for osteointegration by the effect of surface photo functionalization in different aspects as follows: in Ringer's solution, in vitro cell growth, and in vivo study on rabbit. The present study was aimed to investigate the influence of ultraviolet (UV) light on surface topography, corrosion behavior, and bioactivity of indigenously manufactured samples of Ti alloy mini-implant. Materials and Methods: The study includes surface modification of Ti samples by UV treatment, corrosion testing of the specimens using Potentiostat (GAMRY System), qualitative examination of modified surface topography using scanning electron microscope, and cellular viability test on Ti alloy surface (3-(4,5-Dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide ASSAY)...
October 2017: Contemporary Clinical Dentistry
https://www.readbyqxmd.com/read/29325187/in-vivo-evaluation-of-biodegradability-and-biocompatibility-of-fe30mn-alloy
#5
Marine Traverson, Michael Heiden, Lia A Stanciu, Eric A Nauman, Yava Jones-Hall, Gert J Breur
OBJECTIVES:  This study aims to evaluate the biodegradability and biocompatibility of an alloy of iron and manganese (Fe30Mn) in a bone model in vivo. METHODS:  Resorption of a Fe30Mn wire was compared with traditional permanent 316L stainless steel (SS) wire after bilateral transcondylar femoral implantation in 12 rats. Evaluation of biodegradation over 6 months was performed using radiography, post-mortem histology and microscopic implant surface analysis...
January 2018: Veterinary and Comparative Orthopaedics and Traumatology: V.C.O.T
https://www.readbyqxmd.com/read/29322629/material-dependent-fretting-corrosion-in-spinal-fusion-devices-evaluation-of-onset-and-long-term-response
#6
Vaneet Singh, Jacob P Shorez, Sachin A Mali, Nadim J Hallab, Jeremy L Gilbert
Posterior spinal fusion implants include number of interconnecting components, which are subjected to micromotion under physiological loading conditions inducing a potential for fretting corrosion. There is very little known about the fretting corrosion in these devices in terms of the minimum angular displacement (threshold) necessary to induce fretting corrosion or the amount of fretting corrosion that can arise during the life of the implant. Therefore, the first goal was to evaluate the threshold fretting corrosion in three anatomical orientations and second the long-term fretting corrosion for the three different material types of spinal implants under physiological loading conditions...
January 10, 2018: Journal of Biomedical Materials Research. Part B, Applied Biomaterials
https://www.readbyqxmd.com/read/29321813/novel-concept-of-a-modular-hip-implant-could-contribute-to-less-implant-failure-in-tha-a-hypothesis
#7
Ronny Grunert, Stefan Schleifenbaum, Robert Möbius, Michael Kopper, Christian Rotsch, Welf-Guntram Drossel, Niels Hammer, Torsten Prietzel
Background: The modularity in total hip arthroplasty (THA) allows orthopaedic surgeons for an exact reconstruction of hip biomechanical parameters especially in revision and tumor arthroplasty. Modular structured femoral stems using taper junctions showed increased implant breakage in the recent past. Presentation of the hypothesis: We hypothesize that a novel modular stem-neck-interface leads to less implant breakage compared to conventional femoral stems. Testing of the hypothesis: For this purpose, a novel modular femoral stem for THA was to design and manufacture...
2018: Patient Safety in Surgery
https://www.readbyqxmd.com/read/29310434/in-vitro-and-in-vivo-studies-on-biomedical-magnesium-low-alloying-with-elements-gadolinium-and-zinc-for-orthopaedic-implant-applications
#8
Dong Bian, Jiuxu Deng, Nan Li, Xiao Chu, Yang Liu, Wenting Li, Hong Cai, Peng Xiu, Yu Zhang, Zhenpeng Guan, Yufeng Zheng, Yuhui Kou, Baoguo Jiang, Rongshi Chen
Ternary magnesium alloys with low combined-addition of elements gadolinium and zinc were developed in the present work, with their microstructures, mechanical properties, in vitro degradation behaviors and cytotoxicity being systematically studied. Furthermore, Mg-1.8Zn-0.2Gd alloy, with the best in vitro performances, was implanted into Sprague Dawley rats to examine its in vivo degradation performances up to 6 months. It was found that Mg-1.8Zn-0.2Gd, composed of single α-Mg phase, owned excellent strength and toughness that were comparable to the CE marked MAGNEZIX®, the mischmetal added Mg alloy...
January 9, 2018: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/29306081/in-silico-design-of-magnesium-implants-macroscopic-modeling
#9
J A Sanz-Herrera, E Reina-Romo, A R Boccaccini
Magnesium-based biomedical implants offer many advantages versus traditional ones although some challenges are still present. In this context, mathematical modeling and computational simulation may be a useful and complementary tool to evaluate in silico the performance of magnesium biomaterials under different conditions. In this paper, a phenomenologically-based model to simulate magnesium corrosion is developed. The model describes the physico-chemical interactions and evolution of species present in this phenomenon...
December 21, 2017: Journal of the Mechanical Behavior of Biomedical Materials
https://www.readbyqxmd.com/read/29300000/the-use-of-tungsten-as-a-chronically-implanted-material
#10
Ahmad Shah Idil, Nick Donaldson
This review paper shows that tungsten should not generally by used as a chronically implanted material. The metal has a long implant history, from neuroscience, vascular medicine, radiography, orthopaedics, prosthodontics, and various other fields, primarily as a result of its high density, radiopacity, tensile strength and yield point. However a crucial material criterion for chronically implanted metals is their long term resistance to corrosion in body fluids, either by inherently noble metallic surfaces, or by protective passivation layers of metal oxide...
January 4, 2018: Journal of Neural Engineering
https://www.readbyqxmd.com/read/29290499/in-vitro-simulation-of-fretting-corrosion-in-hip-implant-modular-junctions-the-influence-of-ph
#11
Dmitry Royhman, Megha Patel, Joshua J Jacobs, Markus A Wimmer, Nadim J Hallab, Mathew T Mathew
BACKGROUND: The fretting-corrosion behavior of mixed metal contacts is affected by various mechanical and electrochemical parameters. Crevice conditions at the junction and patient-specific pathologies can affect the pH of the prosthetic environment. The main objective of this study is to understand the effect of pH variation at the stem/head junction of the hip implant under fretting corrosion exposure. We hypothesized that pH will have a significant influence on the fretting-corrosion behavior hip implant modular junctions...
December 28, 2017: Medical Engineering & Physics
https://www.readbyqxmd.com/read/29280956/electrochemical-corrosion-and-in-vitro-bioactivity-of-nano-grained-biomedical-ti-20nb-13zr-alloy-in-a-simulated-body-fluid
#12
Mohamed A Hussein, Madhan Kumar, Robin Drew, Nasser Al-Aqeeli
The bioactivity and the corrosion protection for a novel nano-grained Ti-20Nb-13Zr at % alloy were examined in a simulated body fluid (SBF). The effect of the SPS's temperature on the corrosion performance was investigated. The phases and microstructural details of the developed alloy were analyzed by XRD (X-ray Diffraction), SEM (Scanning Electron Microscopy), and TEM (Transmission Electron Microscope). The electrochemical study was investigated using linear potentiodynamic polarization and electrochemical impedance spectroscopy in a SBF, and the bioactivity was examined by immersing the developed alloy in a SBF for 3, 7, and 14 days...
December 27, 2017: Materials
https://www.readbyqxmd.com/read/29278375/tribochemical-characterization-and-tribocorrosive-behavior-of-cocrmo-alloys-a-review
#13
REVIEW
Wei Quan Toh, Xipeng Tan, Ayan Bhowmik, Erjia Liu, Shu Beng Tor
Orthopedic implants first started out as an all-metal hip joint replacement. However, poor design and machinability as well as unsatisfactory surface finish subjected the all-metal joint replacement to being superseded by a polyethylene bearing. Continued improvement in manufacturing techniques together with the reality that polyethylene wear debris can cause hazardous reactions in the human body has brought about the revival of metal-on-metal (MOM) hip joints in recent years. This has also led to a relatively new research area that links tribology and corrosion together...
December 26, 2017: Materials
https://www.readbyqxmd.com/read/29243907/strategy-of-metal-polymer-composite-stent-to-accelerate-biodegradation-of-iron-based-biomaterials
#14
Yongli Qi, Haiping Qi, Yao He, Wenjiao Lin, Pei-Ze Li, Li Qin, Yiwen Hu, Liping Chen, Qingsong Liu, Hongtao Sun, Qiong Liu, Gui Zhang, Shuquan Cui, Jun Hu, Lin Yu, Deyuan Zhang, Jiandong Ding
The new principle and technique to tune biodegradation rates of biomaterials is one of keys to development of regenerative medicine and next-generation biomaterials. Biodegradable stents are new-generation medical devices applied in percutaneous coronary intervention etc. Recently, both corrodible metals and degradable polymers have drawn much attention in biodegradable stents or scaffolds. It is, however, a dilemma to achieve good mechanical properties and appropriate degradation profiles. Herein, we put forward a metal-polymer composite strategy to achieve both...
December 15, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/29232643/mechanical-corrosion-and-biocompatibility-behaviour-of-mg-3zn-ha-biodegradable-composites-for-orthopaedic-fixture-accessories
#15
Satish Jaiswal, R Manoj Kumar, Pallavi Gupta, Murali Kumaraswamy, Partha Roy, Debrupa Lahiri
Development of biodegradable implants has grown into one of the important areas in medical science. Degradability becomes more important for orthopaedic accessories used to support fractured and damaged bones, in order to avoid second surgery for their removal after healing. Clinically available biodegradable orthopaedic materials are mainly made of polymers or ceramics. These orthopaedic accessories have an unsatisfactory mechanical strength, when used in load-bearing parts. Magnesium and its alloys can be suitable candidate for this purpose, due to their outstanding strength to weight ratio, biodegradability, non-toxicity and mechanical properties, similar to natural bone...
November 21, 2017: Journal of the Mechanical Behavior of Biomedical Materials
https://www.readbyqxmd.com/read/29230206/anaerobic-corrosion-of-304-stainless-steel-caused-by-the-pseudomonas-aeruginosa-biofilm
#16
Ru Jia, Dongqing Yang, Dake Xu, Tingyue Gu
Pseudomonas aeruginosa is a ubiquitous bacterium capable of forming problematic biofilms in many environments. They cause biocorrosion of medical implants and industrial equipment and infrastructure. Aerobic corrosion of P. aeruginosa against stainless steels has been reported by some researchers while there is a lack of reports on anaerobic P. aeruginosa corrosion in the literature. In this work, the corrosion by a wild-type P. aeruginosa (strain PAO1) biofilm against 304 stainless steel (304 SS) was investigated under strictly anaerobic condition for up to 14 days...
2017: Frontiers in Microbiology
https://www.readbyqxmd.com/read/29214721/surface-characterization-of-titanium-implant-healing-abutments-before-and-after-placement
#17
Sutton E Wheelis, Thomas G Wilson, Pilar Valderrama, Danieli C Rodrigues
BACKGROUND: Implant healing abutments (IHA) have a vital role in soft tissue healing after implant placement. Although there is thorough investigation on the implant surface, little is known about the effects potentially damaging oral conditions impose on healing abutments. PURPOSE: To characterize the surface of titanium healing abutments before and after clinical placement to understand the effects of the oral environment and time on the device surface. MATERIALS AND METHODS: Ten regular Straumann IHA were subjected to characterization pre and postplacement to elucidate the effects of the oral environment on device surfaces...
December 6, 2017: Clinical Implant Dentistry and related Research
https://www.readbyqxmd.com/read/29204482/corrosion-and-adverse-local-tissue-reaction-after-total-hip-arthroplasty-with-a-modular-titanium-alloy-femoral-neck
#18
Colin D Canham, Pavel I Muradov, Jordan B Simpson, Stephen J Incavo
This report describes a case of mechanically assisted crevice corrosion and secondary adverse local tissue reaction in a patient following a total hip arthroplasty, utilizing a modular neck (bi-modular) femoral component. Radiographic evaluation demonstrated a well-positioned, stable, cementless arthroplasty. Upon further evaluation, the patient had elevated serum cobalt and chromium levels, and magnetic resonance imaging demonstrated a periprosthetic pseudotumor. Corrosion of both the neck-stem and head-neck junctions was suspected...
December 2017: Arthroplasty Today
https://www.readbyqxmd.com/read/29196871/three-cases-of-metallosis-associated-with-spine-instrumentation
#19
Reed Ayers, Mackenzie Miller, Jeffery Schowinsky, Evalina Burger, Vikas Patel, Christopher Kleck
The characteristic trait of metallosis is the presence of tissue staining. Analyzing explanted revision hardware from spine surgeries and performing ICPMS/AES analysis on removed tissue samples, a clinically relevant definition for metallosis may be developed. Results of the analysis identified hardware fretting wear and corrosion, and ICP-MS/AES analysis identified elevated metal ion concentrations in all cases. This supports the hypothesis that corrosion may be linked to poor health outcomes and potential need for revision surgery...
December 1, 2017: Journal of Materials Science. Materials in Medicine
https://www.readbyqxmd.com/read/29196637/influence-of-the-electrolyte-s-ph-on-the-properties-of-electrochemically-deposited-hydroxyapatite-coating-on-additively-manufactured-ti64-alloy
#20
Alina Vladescu, Diana M Vranceanu, Slawek Kulesza, Alexey N Ivanov, Mirosław Bramowicz, Alexander S Fedonnikov, Mariana Braic, Igor A Norkin, Andrey Koptyug, Maria O Kurtukova, Mihaela Dinu, Iulian Pana, Maria A Surmeneva, Roman A Surmenev, Cosmin M Cotrut
Properties of the hydroxyapatite obtained by electrochemical assisted deposition (ED) are dependent on several factors including deposition temperature, electrolyte pH and concentrations, applied potential. All of these factors directly influence the morphology, stoichiometry, crystallinity, electrochemical behaviour, and particularly the coating thickness. Coating structure together with surface micro- and nano-scale topography significantly influence early stages of the implant bio-integration. The aim of this study is to analyse the effect of pH modification on the morphology, corrosion behaviour and in vitro bioactivity and in vivo biocompatibility of hydroxyapatite prepared by ED on the additively manufactured Ti64 samples...
December 1, 2017: Scientific Reports
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