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Implant corrosion

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https://www.readbyqxmd.com/read/28732850/promising-bio-composites-of-polypyrrole-and-chitosan-surface-protective-and-in-vitro-biocompatibility-performance-on-316l-ss-implants
#1
A Madhan Kumar, Bharathi Suresh, Soumyadip Das, I B Obot, Akeem Yusuf Adesina, Suresh Ramakrishna
Advanced biomedical materials can potentially be developed from combinations of natural biodegradable polymers and synthetic polymers. We synthesized bioactive composites based on polypyrrole/chitosan through in-situ electrochemical polymerization in oxalic acid medium. Surface characterization results revealed the influence of chitosan inclusion on polypyrrole (PPy) surface morphology. Contact angle results confirmed the enhancement in surface hydrophilicity due to the addition of chitosan into the PPy matrix...
October 1, 2017: Carbohydrate Polymers
https://www.readbyqxmd.com/read/28730462/nd-induced-honeycomb-structure-of-intermetallic-phase-enhances-the-corrosion-resistance-of-mg-alloys-for-bone-implants
#2
Cijun Shuai, Youwen Yang, Shuping Peng, Chengde Gao, Pei Feng, Jian Chen, Yong Liu, Xin Lin, Sheng Yang, Fulai Yuan
Mg-5.6Zn-0.5Zr alloy (ZK60) tends to degrade too rapid for orthopedic application, in spite of its natural degradation, suitable strength and good biocompatibility. In this study, Nd was alloyed with ZK60 via laser melting method to enhance its corrosion resistance. The microstructure features, mechanical properties and corrosion behaviors of ZK60-xNd (x = 0, 1.8, 3.6, 5.4 wt.%) were investigated. Results showed that laser melted ZK60-xNd were composed of fine ɑ-Mg grains and intermetallic phases along grain boundaries...
September 2017: Journal of Materials Science. Materials in Medicine
https://www.readbyqxmd.com/read/28719860/liposome-modified-titanium-surface-a-strategy-to-locally-deliver-bioactive-molecules
#3
Vincenzo De Leo, Monica Mattioli-Belmonte, Maria Teresa Cimmarusti, Annamaria Panniello, Manuela Dicarlo, Francesco Milano, Angela Agostiano, Elvira De Giglio, Lucia Catucci
Titanium and its alloys are widely employed materials for implants in orthopedic or dental surgery due to their mechanical properties, resistance to corrosion and osseointegration capability. However adverse reactions at the tissue/implant interface may occur, which limit the success of the osseointegration process. Therefore, different strategies have to be used to overcome these drawbacks. In this work, we developed two different liposome-based coatings on titanium surfaces as drug or bioactive molecule deposits for dental/orthopedic implant applications...
July 8, 2017: Colloids and Surfaces. B, Biointerfaces
https://www.readbyqxmd.com/read/28716448/textile-aging-characterization-on-new-generations-of-explanted-commercial-endoprostheses-a-preliminary-study
#4
A Bussmann, F Heim, C Delay, E Girsowicz, B Del Tatto, D Dion, J Papillon, A Lejay, J Chakfé, F Thaveau, Y Georg, N Chakfé
OBJECTIVE/BACKGROUND: The goal of the present study was to assess the aging phenomena on second-generation textile endoprostheses (EPs) through explant analysis and to establish a preliminary classification of observed defects and material damages. METHODS: From January 2011 to June 2016 110 second- and recent-generation EPs were collected as a part of a European collaborative retrieval program. The analysis focused on the first 41 consecutive commercial EPs collected between 2011 and 2014 and made from polyethylene terephthalate...
July 14, 2017: European Journal of Vascular and Endovascular Surgery
https://www.readbyqxmd.com/read/28712796/electrosurgery-induced-damage-to-ti-6al-4v-and-cocrmo-alloy-surfaces-in-orthopedic-implants-in%C3%A2-vivo-and-in%C3%A2-vitro
#5
Gregory W Kubacki, Shiril Sivan, Jeremy L Gilbert
BACKGROUND: Recent observations of specific metal damage patterns on retrieved total joint implants implied a cellular origin and was termed inflammatory cell-induced (ICI) corrosion. Although ICI corrosion continues to present a potential damage source for metallic biomaterials surfaces, an alternate source of some damage patterns may arise from electrosurgery instruments in total joint arthroplasty. METHODS: To characterize electrosurgically-induced damage patterns on metal implants, a model system of highly polished CoCrMo and Ti-6Al-4V disks and commercial electrosurgical generator was evaluated in various modes and power settings using monopolar and bipolar configurations...
June 17, 2017: Journal of Arthroplasty
https://www.readbyqxmd.com/read/28709788/making-sense-of-metal-allergy-and-hypersensitivity-to-metallic-implants-in-relation-to-hand-surgery
#6
REVIEW
Thomas J Christensen, Shefali A Samant, Alexander Y Shin
All metals implanted into a biological system undergo some degree of corrosion depending upon its composition. The electrochemical process of corrosion produces free metal ions, which may activate the host's immune system through a variety of mechanisms. Whereas dermal metal hypersensitivity is common, affecting 10% to 15% of the population, the immune reaction from implanted metals is much less common (< 0.1%), but has been associated with metal allergy and hypersensitivity producing a multitude of patient symptoms...
July 11, 2017: Journal of Hand Surgery
https://www.readbyqxmd.com/read/28699417/comparison-of-metal-ion-concentrations-and-implant-survival-after-total-hip-arthroplasty-with-metal-on-metal-versus-metal-on-polyethylene-articulations
#7
Henrik Dahlstrand, André Stark, Marius C Wick, Lucas Anissian, Nils P Hailer, Rüdiger J Weiss
Background and purpose - Large metal-on-metal (MoM) articulations are associated with metal wear and corrosion, leading to increased metal ion concentrations and unacceptable revision rates. There are few comparative studies of 28-mm MoM articulations with conventional metal-on-polyethylene (MoP) couplings. We present a long-term follow-up of a randomized controlled trial comparing MoM versus MoP 28-mm articulations, focused on metal ions and implant survival. Patients and methods - 85 patients with a mean age of 65 years at surgery were randomized to a MoM (Metasul) or a MoP (Protasul) bearing...
July 12, 2017: Acta Orthopaedica
https://www.readbyqxmd.com/read/28696371/biocompatibility-of-four-common-orthopedic-biomaterials-following-a-high-salt-diet-an-in-vivo-study
#8
Mathieu Lecocq, Cécile Bernard, Marie Solenne Felix, Jean-Marc Linares, Julien Chaves-Jacob, Patrick Decherchi, Erick Dousset
Nowadays, salt consumption appears to be drastically above the recommended level in industrialized countries. The health consequences of this overconsumption are heavy since high-salt intake induces cardiovascular disease, kidney dysfunction, and stroke. Moreover, harmful interaction may also occur with orthopaedic devices because overconsumption of salt reinforces the corrosive aspect of biological tissues and favors bone resorption process. In the present study, we aimed to assess the in vivo effect of three weeks of a high-salt diet, associated (or not) with two weeks of the neuro-myoelectrostimulation (NMES) rehabilitation program on the biocompatibility of four biomaterials used in the manufacture of arthroplasty implants...
July 11, 2017: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/28695184/the-stability-of-dual-taper-modular-hip-implants-a-biomechanical-analysis-examining-the-effect-of-impact-location-on-component-stability
#9
Nicholas B Frisch, Jonathan R Lynch, Richard F Banglmaier, Craig D Silverton
BACKGROUND: The purpose of this study was to investigate the stability of dual-taper modular implants following impaction forces delivered at varying locations as measured by the distraction forces required to disassemble the components. METHODS: Distraction of the head-neck and neck-stem (NS) tapers of dual-taper modular implants with 0°, 8°, and 15° neck angles were measured utilizing a custom-made distraction fixture attached to a servohydraulic materials test machine...
June 2017: Arthroplasty Today
https://www.readbyqxmd.com/read/28688364/in-vivo-study-of-microarc-oxidation-coated-biodegradable-magnesium-plate-to-heal-bone-fracture-defect-of-3mm-width
#10
Y F Wu, Y M Wang, Y B Jing, J P Zhuang, J L Yan, Z K Shao, M S Jin, C J Wu, Y Zhou
Microarc oxidation (MAO) coated magnesium (Mg) with improved corrosion resistance appeal increasing interests as a revolutionary biodegradable metal for fractured bone fixing implants application. However, the in vivo corrosion degradation of the implants and bone healing response are not well understood, which is highly required in clinic. In the present work, 10μm and 20μm thick biocompatible MAO coatings mainly composed of MgO, Mg2SiO4, CaSiO3 and Mg3(PO4)2 phases were fabricated on AZ31 magnesium alloy...
June 23, 2017: Colloids and Surfaces. B, Biointerfaces
https://www.readbyqxmd.com/read/28668212/fretting-and-corrosion-damage-in-taper-adapter-sleeves-for-ceramic-heads-a-retrieval-study
#11
Daniel W MacDonald, Antonia F Chen, Gwo-Chin Lee, Gregg R Klein, Michael A Mont, Steven M Kurtz, Harold E Cates, Matthew J Kraay, Clare M Rimnac
BACKGROUND: During revision surgery with a well-fixed stem, a titanium sleeve can be used in conjunction with a ceramic head to achieve better stress distribution across the taper surface. In vitro testing suggests that corrosion is not a concern in sleeved ceramic heads; however, little is known about the in vivo fretting corrosion of the sleeves. The purpose of this study was to investigate fretting corrosion in sleeved ceramic heads in retrieved total hip arthroplasties. METHODS: Thirty-seven sleeved ceramic heads were collected during revision...
April 26, 2017: Journal of Arthroplasty
https://www.readbyqxmd.com/read/28654127/bio-camouflage-of-anatase-nanoparticles-explored-by-in-situ-high-resolution-electron-microscopy
#12
Ana R Ribeiro, Arijita Mukherjee, Xuan Hu, Shayan Shafien, Reza Ghodsi, Kun He, Sara Gemini-Piperni, Canhui Wang, Robert F Klie, Tolou Shokuhfar, Reza Shahbazian-Yassar, Radovan Borojevic, Luis A Rocha, José M Granjeiro
While titanium is the metal of choice for most prosthetics and inner body devices due to its superior biocompatibility, the discovery of Ti-containing species in the adjacent tissue as a result of wear and corrosion has been associated with autoimmune diseases and premature implant failures. Here, we utilize the in situ liquid cell transmission electron microscopy (TEM) in a liquid flow holder and graphene liquid cells (GLCs) to investigate, for the first time, the in situ nano-bio interactions between titanium dioxide nanoparticles and biological medium...
June 27, 2017: Nanoscale
https://www.readbyqxmd.com/read/28652735/involvement-of-autophagy-in-tantalum-nanoparticle-induced-osteoblast-proliferation
#13
Chengrong Kang, Limin Wei, Bin Song, Liangjiao Chen, Jia Liu, Bin Deng, Xuan Pan, Longquan Shao
Porous tantalum (Ta) implants are highly corrosion resistant and biocompatible, and they possess significantly better initial stability than that of conventional titanium (Ti) implants. During loading wear, Ta nanoparticles (Ta-NPs) that were deposited on the surface of a porous Ta implant are inevitably released and come into direct contact with peri-implant osteoblasts. The wear debris may influence cell behavior and implant stabilization. However, the interaction of Ta-NPs with osteoblasts has not been clearly investigated...
2017: International Journal of Nanomedicine
https://www.readbyqxmd.com/read/28651162/antibacterial-activity-corrosion-resistance-and-wear-behavior-of-spark-plasma-sintered-ta-5cu-alloy-for-biomedical-applications
#14
Jing Cui, Liang Zhao, Weiwei Zhu, Bi Wang, Cancan Zhao, Liming Fang, Fuzeng Ren
Tantalum has been widely used in orthopedic and dental implants. However, the major barrier to the extended use of such medical devices is the possibility of bacterial adhesion to the implant surface which will cause implant-associated infections. To solve this problem, bulk Ta-5Cu alloy has been fabricated by a combination of mechanical alloying and spark plasma sintering. The effect of the addition of Cu on the hardness, antibacterial activity, cytocompatibility, corrosion resistance and wear performance was systematically investigated...
June 21, 2017: Journal of the Mechanical Behavior of Biomedical Materials
https://www.readbyqxmd.com/read/28645044/mussel-inspired-nano-multilayered-coating-on-magnesium-alloys-for-enhanced-corrosion-resistance-and-antibacterial-property
#15
Bi Wang, Liang Zhao, Weiwei Zhu, Liming Fang, Fuzeng Ren
Magnesium alloys are promising candidates for load-bearing orthopedic implants due to their biodegradability and mechanical resemblance to natural bone tissue. However, the high degradation rate and the risk of implant-associated infections pose grand challenges for their clinical applications. Herein, we developed a nano-multilayered coating strategy through polydopamine and chitosan assisted layer-by-layer assembly of osteoinductive carbonated apatite and antibacterial sliver nanoparticles on the surface of AZ31 magnesium alloys...
June 17, 2017: Colloids and Surfaces. B, Biointerfaces
https://www.readbyqxmd.com/read/28629064/advanced-bredigite-containing-magnesium-matrix-composites-for-biodegradable-bone-implant-applications
#16
Sina Naddaf Dezfuli, Zhiguang Huan, Arjan Mol, Sander Leeflang, Jiang Chang, Jie Zhou
The present research was aimed at developing magnesium-matrix composites that could allow effective control over their physiochemical and mechanical responses when in contact with physiological solutions. A biodegradable, bioactive ceramic - bredigite was chosen as the reinforcing phase in the composites, based on the hypothesis that the silicon- and magnesium-containing ceramic could protect magnesium from fast corrosion and at the same time stimulate cell proliferation. Methods to prepare composites with integrated microstructures - a prerequisite to achieve controlled biodegradation were developed...
October 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28629053/a-novel-high-strength-and-highly-corrosive-biodegradable-fe-pd-alloy-structural-mechanical-and-in-vitro-corrosion-and-cytotoxicity-study
#17
Jaroslav Čapek, Šárka Msallamová, Eva Jablonská, Jan Lipov, Dalibor Vojtěch
Recently, iron-based materials have been considered as candidates for the fabrication of biodegradable load-bearing implants. Alloying with palladium has been found to be a suitable approach to enhance the insufficient corrosion rate of iron-based alloys. In this work, we have extensively compared the microstructure, the mechanical and corrosion properties, and the cytotoxicity of an FePd2 (wt%) alloy prepared by three different routes - casting, mechanical alloying and spark plasma sintering (SPS), and mechanical alloying and the space holder technique (SHT)...
October 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28629033/a-new-finding-on-the-in-vivo-crevice-corrosion-damage-in-a-cocrmo-hip-implant
#18
Reza H Oskouei, Mohammad Reza Barati, Hamidreza Farhoudi, Mark Taylor, Lucian Bogdan Solomon
A detailed investigation was performed to characterize the fretting wear and corrosion damage to the neck component of a CoCrMo stem from a metal-on-polyethylene implant retrieved after 99months. The stem was a low-carbon (0.07wt%) wrought Co-28Cr-6Mo alloy with no secondary carbide phases in the matrix (γ-phase). The original design of the neck surface contained an intentionally fabricated knurled profile with a valley-to-peak range of approximately 11μm. Roughness measurements indicated that the tip of the knurled profile was significantly damaged, especially in the distal medial region of the neck, with up to a 22% reduction in the mean peak-to-valley height (Ra) compared to the original profile...
October 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28629030/high-degradation-rate-of-fe-20mn-based-bio-alloys-by-accumulative-cryo-rolling-and-annealing
#19
Hanning Li, Yanan Wang, Qiuming Peng
A new strategy of accumulative cryo-rolling (ACR) at liquid nitrogen temperature and annealing was performed to improve degradation rate of Fe-Mn-based implants. Differing from as-cast and ACRed Fe-Mn-based alloys with single-phase austenite, ACRed-annealed sample mainly consists of austenite and non-equilibrium Fe5C2 precipitate. ACR-annealed sample shows a degradation rate of 0.0388mA·cm(-2), which is 4.6 times higher than as-cast alloy. Pitting corrosion plays a dominant role in both as-cast and ACRed samples...
October 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28628995/in-simulated-body-fluid-performance-of-polymorphic-apatite-coatings-synthesized-by-pulsed-electrodeposition
#20
Shoujie Liu, Hejun Li, Leilei Zhang, Xuemin Yin, Yao Guo
Surface modification is to modify biological responses through changing surface properties without reducing the mechanical properties of the implant. Specifically bioactive coatings, such as hydroxyapatite, carbonate apatite and dicalcium phosphate dehydrate, have been deposited on carbon/carbon (C/C) composites to change the bio-inert surface state. This work focused on the effects of voltages and electrolyte concentrations of pulsed electrodeposition on apatite layer. The apatite coatings thus synthesized were then structurally, morphologically and chemically characterized using X-ray diffraction, scanning electron microscopy, Transmission electron microscopy and Fourier-transform infrared spectroscopy...
October 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
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