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Implant corrosion

Jiasi Luo, Songquan Wu, Yanjin Lu, Sai Guo, Yang Yang, Chaoqian Zhao, Junjie Lin, Tingting Huang, Jinxin Lin
Microstructure, tribological property and corrosion resistance of orthopedic implant materials CoCrW-3 wt.% Cu fabricated by selective laser melting (SLM) process were systematically investigated with CoCrW as control. Equaxied γ-phase together with the inside {111} < 112 > type twin and platelet ε-phase was found in both the Cu-bearing and Cu-free alloys. Compared to the Cu-free alloy, the introduction of 3 wt.% Cu significantly increased the volume fraction of the ε-phase. In both alloys, the hardness of ε-phase zone was rather higher (~4 times) than that of γ-phase zone...
March 19, 2018: Journal of Materials Science. Materials in Medicine
Ehsan Mostaed, Malgorzata Sikora-Jasinska, Jaroslaw W Drelich, Maurizio Vedani
The search for biodegradable metals with mechanical properties equal or higher to those of currently used permanent biomaterials, such as stainless steels, cobalt chromium and titanium alloys, desirable in vivo degradation rate and uniform corrosion is still an open challenge. Magnesium (Mg), iron (Fe) and zinc (Zn)-based alloys have been proposed as biodegradable metals for medical applications. Over the last two decades, extensive research has been done on Mg and Fe. Fe-based alloys show appropriate mechanical properties, but their degradation rate is an order of magnitude below the benchmark value...
March 9, 2018: Acta Biomaterialia
Hongtao Yang, Xinhua Qu, Wenjiao Lin, Cong Wang, Donghui Zhu, Kerong Dai, Yufeng Zheng
Recent studies indicate that there is a great demand to optimize pure Zn with tunable degradation rates and more desirable biocompatibility as orthopedic implants. Metal matrix composite (MMC) can be a promising approach for this purpose. In this study, MMC with pure Zn as a matrix and hydroxyapatite (HA) as reinforcements were prepared by spark plasma sintering (SPS). Feasibility of novel Zn-HA composites to be used as orthopedic implant applications was systematically evaluated. After sintering, HA distributed in the Zn particle boundaries uniformly...
March 9, 2018: Acta Biomaterialia
Rachel Bingley, Alan Martin, Olivia Manfredi, Mahdiyar Nejadhamzeeigilani, Abimbola Oladokun, Andrew Robert Beadling, Sohail Siddiqui, James Anderson, Jonathan Thompson, Anne Neville, Michael Bryant
Interest in the degradation mechanisms at the modular tapers interfaces has been renewed due to increased reported cases of adverse reactions to metal debris and the appearance of wear and corrosion at the modular tapers interfaces at revision. Over the past two decades, a lot of research has been expended to understand the degradation mechanisms, with two primary implant loading procedures and orientations used consistently across the literature. ASTM F1875-98 is often used as a guide to understand and benchmark the tribocorrosion processes occurring within the modular tapers interface...
March 1, 2018: Proceedings of the Institution of Mechanical Engineers. Part H, Journal of Engineering in Medicine
Sang-Hyun Park, Zhen Lu, Robert S Hastings, Patricia A Campbell, Edward Ebramzadeh
BACKGROUND: In 2010, a widely used metal-on-metal hip implant design was voluntarily recalled by the manufacturer because of higher than anticipated failure rates at 5 years. Although there was a large published range of revision rates, numerous studies had reported a higher risk of revision for excessive wear and associated adverse tissue reactions when compared with other metal-on-metal total hips. The reasons for this were suggested by some to be related to cup design features. QUESTIONS/PURPOSES: From retrievals of ASR metal-on-metal implants and tissue samples obtained at revision surgery, we asked the following questions: (1) What were the common and uncommon surface features? (2) What were the common and uncommon linear and volumetric wear characteristics? (3) Were there common taper corrosion characteristics? (4) What aseptic lymphocytic vasculitis-associated lesion (ALVAL) features were present in the tissues? METHODS: Five hundred fifty-five ASRs, including 23 resurfacings, were studied at one academic research center...
February 2018: Clinical Orthopaedics and related Research
Jason C Marvin, Silvia I Gallegos, Shaida Parsaei, Danieli C Rodrigues
PURPOSE: To evaluate the biocompatibility of five dental cement compositions after directly exposing human gingival fibroblast (HGF) and MC3T3-E1 preosteoblast cells to cement alone and cement applied on commercially pure titanium (cpTi) specimens. MATERIALS AND METHODS: Nanostructurally integrated bioceramic (NIB), resin (R), resin-modified glass ionomer (RMGIC), zinc oxide eugenol (ZOE), and zinc phosphate (ZP) compositions were prepared according to the respective manufacturer's instructions...
March 9, 2018: Journal of Prosthodontics: Official Journal of the American College of Prosthodontists
Craig L Sikora, Maria F Alfaro, Judy Chia-Chun Yuan, Valentim A Barao, Cortino Sukotjo, Mathew T Mathew
PURPOSE: Dental implants have been shown to have predictable success, but esthetic complications often arise. To reduce tissue shadowing from titanium, zirconia abutments may be used; however, the literature suggests that the use of zirconia leads to greater destruction of the implant interface that may result in biological complications such as titanium tattoos and heavy metal toxicity. Previous studies have examined the mechanical aspects of this implant/abutment relationship, but they have not accounted for the corrosive degradation that also takes place in the dynamic environment of the oral cavity...
March 9, 2018: Journal of Prosthodontics: Official Journal of the American College of Prosthodontists
Ranran Zhang, Tarek A Elkhooly, Qianli Huang, Xujie Liu, Xing Yang, Hao Yan, Zhiyuan Xiong, Jing Ma, Qingling Feng, Zhijian Shen
To improve the success of medical devices, implants with strong surface bioactivity are urgently required. Coatings with a macroporous structure produced by micro-arc oxidation (MAO) possess advantages, such as strong adhesion to substrate and excellent resistance to wear and corrosion. Mesoporous structures contain pores with sizes of 2-50 nm, which can endow the biomaterials with the ability to enhance osteogenesis and to be loaded with diverse drugs. Thus, in this study, we aimed to evaluate the effects of both macroporous and mesoporous structures using a hierarchical macro/mesoporous structure to modify the titanium implant surface...
March 9, 2018: Journal of Biomedical Materials Research. Part A
Ping Li, Christine Schille, Ernst Schweizer, Frank Rupp, Alexander Heiss, Claudia Legner, Ulrich E Klotz, Jürgen Geis-Gerstorfer, Lutz Scheideler
Zn-based biodegradable metallic materials have been regarded as new potential biomaterials for use as biodegradable implants, mainly because of the ideal degradation rate compared with those of Mg-based alloys and Fe-based alloys. In this study, we developed and investigated a novel Zn-4 wt % Ag alloy as a potential biodegradable metal. A thermomechanical treatment was applied to refine the microstructure and, consequently, to improve the mechanical properties, compared to pure Zn. The yield strength (YS), ultimate tensile strength (UTS) and elongation of the Zn-4Ag alloy are 157 MPa, 261 MPa, and 37%, respectively...
March 7, 2018: International Journal of Molecular Sciences
Wei Liu, Zhijie Yan, Xiaolu Ma, Tie Geng, Haihong Wu, Zhongyue Li
Surface modification on Mg alloys is highly promising for their application in the field of bone repair. In this study, a new metal-organic framework/MgF₂ (Mg-MOF-74/MgF₂) composite coating was prepared on the surface of AZ31B Mg alloy via pre-treatment of hydrofluoric acid and in situ hydrothermal synthesis methods. The surface topography of the composite coating is compact and homogeneous, and Mg-MOF-74 has good crystallinity. The corrosion resistance of this composite coating was investigated through Tafel polarization test and immersion test in simulated body fluid at 37 °C...
March 7, 2018: Materials
Yiqiang Yu, Hua Lu, Jiao Sun
Magnesium (Mg) based materials are the focus of research for use as degradable materials in orthopedics and cranio-maxillofacial surgery. However, corrosion rate control and biosecurity are still the key questions that need solving prior to their clinical applications. In the present study, as-rolled high-purity magnesium (HP Mg, 99.99 wt.%) screws were implanted in rabbit tibiae for over 52 weeks in order to investigate their long-term in vivo evolution and the local and systemic effects of their degradation products...
March 2, 2018: Acta Biomaterialia
Leonardo C Campanelli, Nilson T C Oliveira, Paulo Sergio C P da Silva, Claudemiro Bolfarini, Annalisa Palmieri, Francesca Cura, Francesco Carinci, Artur J Motheo
The objective of this work was a systemic evaluation of the anodizing treatment in a β-type Ti-15Mo alloy to grow a TiO2 nanostructured layer for osseointegration improvement. The technical viability of the surface modification was assessed based on the resistance to mechanical fatigue, electrochemical corrosion, and biological response. By using an organic solution of NH4 F in ethylene glycol, a well-organized array of 90 nm diameter nanotubes was obtained with a potential of 40 V for 6 h, while undefined nanotubes of 25 nm diameter were formed with a potential of 20 V for 1 h...
March 4, 2018: Journal of Biomedical Materials Research. Part B, Applied Biomaterials
A Krull, M M Morlock, N E Bishop
Stem modularity of revision hip implant systems offers the advantage of the restoration of individual patient geometry but introduces additional interfaces, which are subjected to repetitive bending loading and have a propensity for fretting corrosion. The male stem taper is the weakest part of the modular junction due to its reduced cross section compared to the outside diameter of the stem. Taper fractures can be the consequence of overloading in combination with corrosion. The purpose of this study was to assess the influence of implant design factors, patient factors, and surgical factors on the risk of taper failure of the modular junction of revision stems...
February 27, 2018: Medical Engineering & Physics
Mehdi Jafary-Zadeh, Gideon Praveen Kumar, Paulo Sergio Branicio, Mohsen Seifi, John J Lewandowski, Fangsen Cui
Functional and mechanical properties of novel biomaterials must be carefully evaluated to guarantee long-term biocompatibility and structural integrity of implantable medical devices. Owing to the combination of metallic bonding and amorphous structure, metallic glasses (MGs) exhibit extraordinary properties superior to conventional crystalline metallic alloys, placing them at the frontier of biomaterials research. MGs have potential to improve corrosion resistance, biocompatibility, strength, and longevity of biomedical implants, and hence are promising materials for cardiovascular stent applications...
February 27, 2018: Journal of Functional Biomaterials
David Pierre, Viswanathan Swaminathan, Laura Y Scholl, Kevor TenHuisen, Jeremy L Gilbert
BACKGROUND: Mechanically assisted crevice corrosion of modular tapers continues to be a concern in total joint arthroplasties. A surgical factor that may affect taper fretting corrosion during cyclic loading is seating load magnitude. In this study, modular head-neck taper junctions were seated, capturing load-displacement, over a range of axially oriented loads, and electrochemical and micromotion data were captured during short-term incremental cyclic fretting corrosion (ICFC) tests...
February 2, 2018: Journal of Arthroplasty
Yuliang Chen, Zhaowu Wang, Shi Chen, Hui Ren, Liangxin Wang, Guobin Zhang, Yalin Lu, Jun Jiang, Chongwen Zou, Yi Luo
Hydrogenation is an effective way to tune the property of metal oxides. It can conventionally be performed by doping hydrogen into solid materials with noble-metal catalysis, high-temperature/pressure annealing treatment, or high-energy proton implantation in vacuum condition. Acid solution naturally provides a rich proton source, but it should cause corrosion rather than hydrogenation to metal oxides. Here we report a facile approach to hydrogenate monoclinic vanadium dioxide (VO2 ) in acid solution at ambient condition by placing a small piece of low workfunction metal (Al, Cu, Ag, Zn, or Fe) on VO2 surface...
February 26, 2018: Nature Communications
Luciana D Trino, Erika S Bronze-Uhle, Amsaveni Ramachandran, Paulo N Lisboa-Filho, Mathew T Mathew, Anne George
Titanium (Ti) is widely used in biomedical devices due to its recognized biocompatibility. However, implant failures and subsequent clinical side effects are still recurrent. In this context, improvements can be achieved by designing biomaterials where the bulk and the surface of Ti are independently tailored. The conjugation of biomolecules onto the Ti surface can improve its bioactivity, thus accelerating the osteointegration process. Ti was modified with TiO2 , two different spacers, 3-(4-aminophenyl) propionic acid (APPA) or 3-mercaptopropionic acid (MPA) and dentin matrix protein 1 (DMP1) peptides...
February 21, 2018: Journal of the Mechanical Behavior of Biomedical Materials
Michael Joner, Philipp Ruppelt, Philine Zumstein, Capucine Lapointe-Corriveau, Guy Leclerc, Anna Bulin, Maria Isabel Castellanos, Eric Wittchow, Michael Haude, Ron Waksman
AIMS: Because vascular restoration therapy using bioresorbable vascular scaffolds (BRS) remains an appealing concept to restore vasoreactivity, understanding of biodegradation remains paramount during preclinical testing. METHODS AND RESULTS: Qualitative characterization of biodegradation was performed in 41 DREAMS 1G up to 3 years, while degradation kinetics were acquired in 54 DREAMS 2G implanted into porcine coronary arteries for 28, 90 and 180 days, 1 and 2 years...
February 20, 2018: EuroIntervention
L Ottria, D Lauritano, M Andreasi Bassi, A Palmieri, V Candotto, A Tagliabue, L Tettamanti
Implant dentistry has become a popular restorative option in clinical practice. Titanium and titanium alloys are the gold standard for endo-osseus dental implants production, thanks to their biocompatibility, resistance to corrosion and mechanical properties. The characteristics of the titanium implant surface seem to be particularly relevant in the early phase of osseointegration. Furthermore, the microstructure of implant surface can largely influence the bone remodelling at the level of the bone-implant surface...
January 2018: Journal of Biological Regulators and Homeostatic Agents
Yue Zhang, Owen Addison, Fei Yu, Brendy C Rincon Troconis, John R Scully, Alison J Davenport
There is increasing concern regarding the biological consequences of metal release from implants. However, the mechanisms underpinning implant surface degradation, especially in the absence of wear, are often poorly understood. Here the synergistic effect of albumin and H 2 O 2 on corrosion of Ti6Al4V in physiological saline is studied with electrochemical methods. It is found that albumin induces a time-dependent dissolution of Ti6Al4V in the presence of H 2 O 2 in physiology saline. Potentiostatic polarisation measurements show that albumin supresses dissolution in the presence of H 2 O 2 at short times (<24 h) but over longer time periods (120 h) it significantly accelerates corrosion, which is attributed to albumin-catalysed dissolution of the corrosion product layer resulting in formation of a thinner oxide film...
February 16, 2018: Scientific Reports
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