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Implant corrosion

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https://www.readbyqxmd.com/read/28514709/protein-adsorption-on-implant-metals-with-various-deformed-surfaces
#1
Zhongwei Wang, Yu Yan, Lijie Qiao
The adsorption of proteins has great influence on the biocompatibility, lubrication and corrosion properties of implantable metals. The subsurface microstructure of metals can be easily changed during the manufacturing or service processes and it is easily ignored. The same chemical composition but with various surface microstructures can result in very different adsorption behaviour. In this study, mechanical polishing, electrochemical polishing and shot peening methods were used to generate different gradient deformed surfaces for CoCrMo alloys...
May 8, 2017: Colloids and Surfaces. B, Biointerfaces
https://www.readbyqxmd.com/read/28510370/titanium-corrosion-implications-for-dental-implants
#2
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/28499166/potential-biodegradable-zn-cu-binary-alloys-developed-for-cardiovascular-implant-applications
#3
Zibo Tang, Jialin Niu, Hua Huang, Hua Zhang, Jia Pei, Jingmin Ou, Guangyin Yuan
Binary Zn-Cu alloy system is developed as potential biodegradable materials for cardiovascular implant application. The microstructure, tensile properties, in vitro corrosion behavior, cytotoxicity and antibacterial property of as-extruded Zn-xCu (x=1, 2, 3, and 4wt%) alloys are investigated systematically. It shows that as Cu content increases more CuZn5 phase precipitates. After extrusion, the CuZn5 phases are broken and the grains of Zn-xCu alloys are refined. Tensile test shows that Cu addition could significantly improve the mechanical properties of Zn-xCu alloys...
May 6, 2017: Journal of the Mechanical Behavior of Biomedical Materials
https://www.readbyqxmd.com/read/28494593/laser-irradiation-of-mg-al-zn-alloy-reduced-electrochemical-kinetics-and-enhanced-performance-in-simulated-body-fluid
#4
David C Florian, Michael A Melia, Fritz W Steuer, Bruce F Briglia, Michael K Purzycki, John R Scully, James M Fitz-Gerald
As a lightweight metal with mechanical properties similar to natural bone, Mg and its alloys are great prospects for biodegradable, load bearing implants. However, rapid degradation and H2 gas production in physiological media has prevented widespread use of Mg alloys. Surface heterogeneities in the form of intermetallic particles dominate the corrosion response. This research shows that surface homogenization significantly improved the biological corrosion response observed during immersion in simulated body fluid (SBF)...
May 11, 2017: Biointerphases
https://www.readbyqxmd.com/read/28492599/allergic-reaction-to-vanadium-causes-a-diffuse-eczematous-eruption-and-titanium-alloy-orthopedic-implant-failure
#5
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/28483210/metal-on-metal-compared-with-metal-on-polyethylene-the-effect-on-trunnion-corrosion-in-total-hip-arthroplasty
#6
Brent A Lanting, Matthew G Teeter, James L Howard, Steven J MacDonald, Douglas W Van Citters
BACKGROUND: Trunnion tribocorrosion in total hip arthroplasties is concerning, but retrieval studies often are subjective or lack comparison groups. Quantitative comparisons of clinically relevant implants are required. The purpose of this investigation was to evaluate material loss in metal-on-metal (MoM) and metal-on-polyethylene (MoP) total hip articulations while controlling for trunnion design and head size. METHODS: The 166 retrieved femoral heads from 2 manufacturers were analyzed...
March 29, 2017: Journal of Arthroplasty
https://www.readbyqxmd.com/read/28482597/electrochemical-hydroxyapatite-cobalt-ferrite-nanocomposite-coatings-as-well-hyperthermia-treatment-of-cancer
#7
Z Abdel-Hamid, M M Rashad, Salwa M Mahmoud, A T Kandil
The fabrication of hydroxyapatite-Co-ferrite nanocomposite coatings was performed on stainless steel by chronoamperometry technique. HA-CoFe2O4 nanocomposite films were characterized using X-ray diffraction, scanning electron microscopy, and vibrating sample magnetometer (VSM). The results reveal that CoFe2O4 nanoparticles dispersed within the HA matrix have flake and strip shapes. The magnetic property of the nanocomposite was increased by increasing the concentration of CoFe2O4 and a good saturation magnetization value was found to be 20...
July 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28482526/enhancement-of-wear-and-corrosion-resistance-of-low-modulus-%C3%AE-type-zr-20nb-xti-x-0-3-dental-alloys-through-thermal-oxidation-treatment
#8
Jianfeng Zhang, Xiaxia Gan, Hongqun Tang, Yongzhong Zhan
In order to obtain material with low elastic modulus, good abrasion resistance and high corrosion stability as screw for dental implant, the biomedical Zr-20Nb and Zr-20Nb-3Ti alloy with low elastic modulus were thermal oxidized respectively at 700°C for 1h and 600°C for 1.25h to obtain the compact oxidized layer to improve its wear resistance and corrosion resistance. The results show that smooth compact oxidized layer (composed of monoclinic ZrO2, tetragonal ZrO2 and 6ZrO2-Nb2O5) with 22.6μm-43.5μm thickness and 1252-1306HV hardness can be in-situ formed on the surface of the Zr-20Nb-xTi (x=0, 3)...
July 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28482503/degradation-mechanisms-and-future-challenges-of-titanium-and-its-alloys-for-dental-implant-applications-in-oral-environment
#9
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/28482501/metallic-powder-bed-based-3d-printing-of-cellular-scaffolds-for-orthopaedic-implants-a-state-of-the-art-review-on-manufacturing-topological-design-mechanical-properties-and-biocompatibility
#10
REVIEW
X P Tan, Y J Tan, C S L Chow, S B Tor, W Y Yeong
Metallic cellular scaffold is one of the best choices for orthopaedic implants as a replacement of human body parts, which could improve life quality and increase longevity for the people needed. Unlike conventional methods of making cellular scaffolds, three-dimensional (3D) printing or additive manufacturing opens up new possibilities to fabricate those customisable intricate designs with highly interconnected pores. In the past decade, metallic powder-bed based 3D printing methods emerged and the techniques are becoming increasingly mature recently, where selective laser melting (SLM) and selective electron beam melting (SEBM) are the two representatives...
July 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28482473/tribocorrosion-behaviour-of-a-biomedical-ti-25nb-3mo-3zr-2sn-alloy-in-ringer-s-solution
#11
Zhenguo Wang, Weijiu Huang, Yan Li, Haoran He, Yongtao Zhou, Ziqing Zheng
The tribocorrosion behaviour of biomaterial Ti-25Nb-3Mo-3Zr-2Sn alloy in Ringer's solution was evaluated by micro-abrasion experiments, electrochemical tests and scanning electron microscope (SEM) observations. Potentiodynamic polarization results suggested that the effect of particle concentration on the electrochemistry characteristic is greater than the applied load. When the particle concentration and applied load were 0.05g·cm(-3) and 0.25N, respectively, the Ecorr reached the maximum as -0.381V. The micro-abrasion-corrosion results showed that the wear rates of the Ti-25Nb-3Mo-3Zr-2Sn alloy increased with increasing particle concentration and decreased as applied load increased...
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
#12
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/28464615/mg-corrosion-hydroxyapatite-and-bone-healing
#13
Håkan Nygren, Narmin Bigdeli, Lars Ilver, Per Malmberg
The different capacities of magnesium in the metallic form (Mg-metal) and magnesium oxide (MgO) to stimulate bone healing are possible clues in the search for products that may promote bone healing. Since both Mg-metal and MgO can be assumed to release comparable amounts of Mg(2+) ions during their reactions in the tissue where they have been implanted, it is of some importance to follow this process and analyze the resulting mineral formation in the tissue at the implantation site. Implants of MgO were inserted into rat tibia, and the bone healing was compared with sham-operated controls...
May 2, 2017: Biointerphases
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
#14
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/28457378/electrospun-polyhydroxyethyl-aspartamide-polylactic-acid-scaffold-for-biliary-duct-repair-a-preliminary-in%C3%A2-vivo-evaluation
#15
S Buscemi, G Damiano, S Fazzotta, A Maffongelli, V D Palumbo, S Ficarella, C Fiorica, G Cassata, M Licciardi, F S Palumbo, L Gulotta, G Buscemi, A I Lo Monte
Tissue engineering has emerged as a new approach with the potential to overcome the limitations of traditional therapies. The objective of this study was to test whether our polymeric scaffold is able to resist the corrosive action of bile and to support a cell's infiltration and neoangiogenesis with the aim of using it as a biodegradable tissue substitute for serious bile duct injuries. In particular, a resorbable electrospun polyhydroxyethyl-aspartamide-polylactic acid (90 mol% PHEA, 10 mol% PLA)/polycaprolactone (50:50 w/w) plate scaffold was implanted into rabbit gallbladder to assess the in vivo effects of the lytic action of the bile on the scaffold structure and then as a tubular scaffold to create a biliary-digestive anastomosis as well...
May 2017: Transplantation Proceedings
https://www.readbyqxmd.com/read/28456673/retrieval-and-clinical-analysis-of-distraction-based-dual-growing-rod-constructs-for-early-onset-scoliosis
#16
Genevieve Hill, Srinidhi Nagaraja, Behrooz A Akbarnia, Jeff Pawelek, Paul Sponseller, Peter Sturm, John Emans, Pablo Bonangelino, Joshua Cockrum, William Kane, Maureen Dreher
BACKGROUND: Growing rod constructs are an important contribution for treating patients with Early Onset Scoliosis. These devices experience high failure rates, including rod fractures. PURPOSE: The objective of this study was to identify the failure mechanism of retrieved growing rods, and to identify differences between patients with failed and intact constructs. STUDY DESIGN/SETTING: Growing rod patients who had implant removal and were previously enrolled in a multicenter registry were eligible for this study...
April 26, 2017: Spine Journal: Official Journal of the North American Spine Society
https://www.readbyqxmd.com/read/28452456/polylactic-acid-sealed-polyelectrolyte-multilayer-microchambers-for-entrapment-of-salts-and-small-hydrophilic-molecules-precipitates
#17
Meiyu Gai, Johannes Frueh, Valeriya L Kudryavtseva, Alexey M Yashchenok, Gleb B Sukhorukov
Efficient depot systems for entrapment and storage of small water-soluble molecules are of high demand for wide variety of applications ranging from implant based drug delivery in medicine and catalysis in chemical processes to anticorrosive systems in industry where surface-mediated active component delivery is required on a time and site specific manner. This work reports the fabrication of individually sealed hollow-structured polyelectrolyte multilayer (PEM) microchamber arrays based on layer-by-layer self-assembly as scaffolds and microcontact printing...
May 5, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28437322/double-lumen-polyamide-tube-stent-for-the-treatment-of-recurrent-postcorrosive-esophageal-stenosis
#18
Marek Woynarowski, Maciej Dądalski, Violetta Wojno, Mikołaj Teisseyre, Leszek Hurkała, Emil Płowiecki
This article presents the results of endoscopic treatment for recurrent postcorrosive esophageal stenosis with a tube-stent developed at our institution. The tube-stent was implanted in 5 children with corrosive esophageal injury at the age of 2 to 8.5 years after 7 to 64 dilatation sessions during 5 to 118 months. In total, 13 tube-stents were implanted. One patient had undergone 9 procedures during 2.5 years and the tube-stent remained in place for 14 to 250 days. This patient was tube-stent-dependent due to the lack of any possibility of surgical reconstruction...
May 2017: Journal of Pediatric Gastroenterology and Nutrition
https://www.readbyqxmd.com/read/28424946/preparation-and-corrosion-resistance-of-magnesium-phytic-acid-hydroxyapatite-composite-coatings-on-biodegradable-az31-magnesium-alloy
#19
Min Zhang, Shu Cai, Feiyang Zhang, Guohua Xu, Fengwu Wang, Nian Yu, Xiaodong Wu
In this work, a magnesium phytic acid/hydroxyapatite composite coating was successfully prepared on AZ31 magnesium alloy substrate by chemical conversion deposition technology with the aim of improving its corrosion resistance and bioactivity. The influence of hydroxyapatite (HA) content on the microstructure and corrosion resistance of the coatings was investigated. The results showed that with the increase of HA content in phytic acid solution, the cracks on the surface of the coatings gradually reduced, which subsequently improved the corrosion resistance of these coated magnesium alloy...
June 2017: Journal of Materials Science. Materials in Medicine
https://www.readbyqxmd.com/read/28415518/antimicrobial-property-cytocompatibility-and-corrosion-resistance-of-zn-doped-zro2-tio2-coatings-on-ti6al4v-implants
#20
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
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