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https://www.readbyqxmd.com/read/28424946/preparation-and-corrosion-resistance-of-magnesium-phytic-acid-hydroxyapatite-composite-coatings-on-biodegradable-az31-magnesium-alloy
#1
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
#2
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/28415428/the-effect-of-sliding-onto-the-metal-electrolyte-interface-studying-model-parameter-modifications-by-means-of-eis
#3
Josianne Cassar, Bertram Mallia, Andreas Karl, Joseph Buhagiar
Several problems are associated with corrosion-wear occurring on metal-on-metal hip implants made out of cobalt-chromium based alloys. Low temperature carburizing, a process that creates a hard and corrosion resistant diffused layer in Cobalt-Chromium-Molybdenum (CoCrMo) alloys, known as S-phase, may be a possible solution towards mitigating these problems. In this work, static- and tribo-corrosion testing involving an alumina versus CoCrMo (untreated and carburized) were conducted in Ringer's solution. Electrochemical impedance spectroscopy was used to compare impedance plots attained before and after sliding so as to understand how the metal-electrolyte interface is affected by rubbing...
June 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28415426/influence-of-dy-in-solid-solution-on-the-degradation-behavior-of-binary-mg-dy-alloys-in-cell-culture-medium
#4
Lei Yang, Liangong Ma, Yuanding Huang, Frank Feyerabend, Carsten Blawert, Daniel Höche, Regine Willumeit-Römer, Erlin Zhang, Karl Ulrich Kainer, Norbert Hort
Rare earth element Dy is one of the promising alloying elements for magnesium alloy as biodegradable implants. To understand the effect of Dy in solid solution on the degradation of Mg-Dy alloys in simulated physiological conditions, the present work studied the microstructure and degradation behavior of Mg-Dy alloys in cell culture medium. It is found the corrosion resistance enhances with the increase of Dy content in solid solution in Mg. This can be attributed to the formation of a relatively more corrosion resistant Dy-enriched film which decreases the anodic dissolution of Mg...
June 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28415419/lsp-mao-composite-bio-coating-on-az80-magnesium-alloy-for-biomedical-application
#5
Ying Xiong, Qiang Hu, Renguo Song, Xiaxia Hu
A composite bio-coating was fabricated on AZ80 magnesium (Mg) alloy by using micro-arc oxidation (MAO) under the pretreatment of laser shock peening (LSP) in order to improve the bio-corrosion resistance and the mechanical integrity. LSP treatment could induce grain refinement and compressive residual stress field on the surface of material. MAO bio-coating was grown in alkaline electrolyte with hydroxyapatite (HA, Ca10(PO4)6(OH)2) to improve the biological properties of the material. The microstructure, element and phase composition for untreated based material (BM) and treated samples (LSP layer, MAO bio-coating and LSP/MAO composite bio-coating) were investigated by transmission electron microscopy (TEM), scanning electron microscope (SEM), energy dispersion spectroscopy (EDS) and X-ray diffraction (XRD)...
June 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28415391/biological-activity-evaluation-of-magnesium-fluoride-coated-mg-zn-zr-alloy-in-vivo
#6
Hongfeng Jiang, Jingbo Wang, Minfang Chen, Debao Liu
AIM: To explore the biodegradable characteristics and biological properties, which could promote new bone formation, of MgF2 coated magnesium alloy (Mg-3wt%Zn-0.5wt%Zr) in rabbits. METHODS: Magnesium alloy with MgF2 coating was made and the MgF2/Mg-Zn-Zr was implanted in the femoral condyle of rabbits. Twelve healthy adult Japanese white rabbits in weight of 2.8-3.2kg were averagely divided into A(Mg-Zn-Zr) group and B(MgF2/MgZn-Zr) group. Indexes such as microstructural evolution, SEM scan, X-ray, Micro-CT and mechanical properties were observed and detected at 1th day, 2th, 4th, 8th, 12th, 24th week after implantation...
June 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28415381/biocompatibility-study-on-ni-free-ti-based-and-zr-based-bulk-metallic-glasses
#7
T H Li, P C Wong, S F Chang, P H Tsai, J S C Jang, J C Huang
Safety and reliability are crucial issues for medical instruments and implants. In the past few decays, bulk metallic glasses (BMGs) have drawn attentions due to their superior mechanical properties, good corrosion resistance, antibacterial and good biocompatibility. However, most Zr-based and Ti-based BMGs contain Ni as an important element which is prone to human allergy problem. In this study, the Ni-free Ti-based and Zr-based BMGs, Ti40Zr10Cu36Pd14, and Zr48Cu36Al8Ag8, were selected for systematical evaluation of their biocompatibility...
June 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28397881/a-promising-biodegradable-magnesium-alloy-suitable-for-clinical-vascular-stent-application
#8
Lin Mao, Li Shen, Jiahui Chen, Xiaobo Zhang, Minsuk Kwak, Yu Wu, Rong Fan, Lei Zhang, Jia Pei, Guangyin Yuan, Chengli Song, Junbo Ge, Wenjiang Ding
We report a Mg alloy Mg-2.2Nd-0.1Zn-0.4Zr (wt.%, denoted as JDBM-2) showing great potential in clinical vascular stent application by integrating the advantages of traditional medical stainless steel and polymer. This alloy exhibits high yield strength and elongation of 276 ± 6 MPa and 34.3 ± 3.4% respectively. The JDBM-2 with a stable degradation surface results in a highly homogeneous degradation mechanism and long-term structural and mechanical durability. In vitro cytotoxicity test of the Mg extract via human vascular endothelial cells (HUVECs) indicates that the corrosion products are well tolerated by the tested cells and potentially negligible toxic effect on arterial vessel walls...
April 11, 2017: Scientific Reports
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/28386061/effect-of-ca-p-compound-formed-by-hydrothermal-treatment-on-biodegradation-and-biocompatibility-of-mg-3al-1zn-1-5ca-alloy-in-vitro-and-in-vivo-evaluation
#10
Yu-Kyoung Kim, Yong-Seok Jang, Young-Hee Lee, Ho-Keun Yi, Tae-Sung Bae, Min-Ho Lee
Chemical combinations of Ca-P produced via plasma electrolytic oxidation (PEO) and a hydrothermal treatment were fabricated to improve the initial corrosion resistance and biocompatibility of a biodegradable Mg-3Al-1Zn-1.5Ca alloy. For the formation of an amorphous calcium phosphate composite layer on the surface of a magnesium alloy, a PEO layer composed of MgO and Mg3(PO4)2 was formed by PEO in electrolytes containing preliminary phosphate ions. During the second stage, a thick and dense Ca layer was formed by Ca electrodeposition after PEO...
April 6, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28384526/biomineralisation-with-saos-2-bone-cells-on-tisin-sputtered-ti-alloys
#11
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
#12
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/28371514/bi-layer-silk-fibroin-grafts-support-functional-esophageal-repair-in-a-rodent-model-of-caustic-injury
#13
Khalid Algarrahi, Debra Franck, Alyssa Savarino, Vivian Cristofaro, Xuehui Yang, Saif Affas, Frank-Mattias Schäfer, Maryrose P Sullivan, Carlos R Estrada, Joshua R Mauney
Surgical repair of caustic esophageal injuries with autologous gastrointestinal segments is often associated with dysmotility, dysphagia, and donor site morbidity and therefore alternative graft options are needed. Bi-layer silk fibroin (BLSF) scaffolds were assessed for their ability to support functional restoration of damaged esophageal tissues in a rat model of onlay esophagoplasty. Transient exposure of isolated esophageal segments with 40% NaOH led to corrosive esophagitis and a 91% reduction in the luminal cross-sectional area of damaged sites...
March 30, 2017: Journal of Tissue Engineering and Regenerative Medicine
https://www.readbyqxmd.com/read/28349700/fast-corroding-thin-magnesium-coating-displays-antibacterial-effects-and-low-cytotoxicity
#14
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...
March 28, 2017: Biofouling
https://www.readbyqxmd.com/read/28343824/assessment-of-corrosion-fretting-and-material-loss-of-retrieved-modular-total-knee-arthroplasties
#15
Audrey J Martin, Kirsten A Seagers, Douglas W Van Citters
BACKGROUND: Modular junctions in total hip arthroplasties have been associated with fretting, corrosion, and debris release. The purpose of this study is to analyze damage severity in total knee arthroplasties of a single design by qualitative visual assessment and quantitative material loss measurements to evaluate implant performance and patient impact via material loss. METHODS: Twenty-two modular knee retrievals of the same manufacturer were identified from an institutional review board-approved database...
February 28, 2017: Journal of Arthroplasty
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/28315492/long-term-in-vivo-corrosion-behavior-biocompatibility-and-bioresorption-mechanism-of-a-bioresorbable-nitrided-iron-scaffold
#17
Wenjiao Lin, Li Qin, Haiping Qi, Deyuan Zhang, Gui Zhang, Runlin Gao, Hong Qiu, Ying Xia, Ping Cao, Xiang Wang, Wei Zheng
Pure iron as a potential bioresorbable material for bioresorbable coronary scaffold has major disadvantages of slow corrosion and bioresorption. However, so far, there are neither quantitative data of long-term in vivo corrosion nor direct experimental evidence for bioresorption of pure iron and its alloys, which are fundamental and vital for developing novel Fe-based alloys overcoming the intrinsic drawbacks of pure iron. This work systemically investigated scaffold performance, long-term in vivo corrosion behavior and biocompatibility of a nitrided iron coronary scaffold and explored its bioresorption mechanism...
March 14, 2017: Acta Biomaterialia
https://www.readbyqxmd.com/read/28302488/protective-effects-of-zn-2-against-cobalt-nanoparticles-and-cobalt-chloride-induced-cytotoxicity-of-raw-264-7cells-via-ros-pathway
#18
Hai Zhu, Yake Liu, Hongxiang Hong, Wei Wang, Fan Liu
Recent concerns have emerged surrounding the toxicity that cobalt may represent when used in MOM implants. Owing to corrosion and wear of MOM implants, the subsequent released cobalt nanoparticles (CoNPs) or Co ions (Co(2+)) can cause adverse reactions, such as the generation of pseudotumors, extensive necrosis, early osteolysis, and implants failure. The present study confirmed that CoNPs and Co(2+) can induce dose- and time-dependent cytotoxicity with increasing reactive oxygen species (ROS) levels. Additionally, using metallothionein (MT), a heavy metal-binding protein, the present study assessed the protective effects of Zn(2+) against CoNPs and Co(2+)-induced cytotoxicity of RAW 264...
April 29, 2017: Biochemical and Biophysical Research Communications
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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