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Implant corrosion

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https://www.readbyqxmd.com/read/28216843/in-vitro-evaluation-of-cytotoxicity-and-corrosion-behavior-of-commercially-pure-titanium-and-ti-6al-4v-alloy-for-dental-implants
#1
Sanchitha Chandar, Ravindra Kotian, Prashanthi Madhyastha, Shama Prasada Kabekkodu, Padmalatha Rao
PURPOSE: The aim of this study was to investigate the cytotoxicity in human gingival fibroblast by 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide (MTT) assay and corrosion behavior by potentiodynamic polarization technique of commercially pure titanium (Ti 12) and its alloy Ti-6Al-4V (Ti 31). MATERIALS AND METHODS: In the present in vitro study, cytotoxicity of Ti 12 and Ti 31 in human gingival fibroblast by MTT assay and the corrosion behavior by potentiodynamic polarization technique in aqueous solutions of 0...
January 2017: Journal of Indian Prosthodontic Society
https://www.readbyqxmd.com/read/28197988/in-vivo-and-in-vitro-degradation-comparison-of-pure-mg-mg-10gd-and-mg-2ag-a-short-term-study
#2
I Marco, A Myrissa, E Martinelli, F Feyerabend, R Willumeit-Römer, A M Weinberg, O Van der Biest
The purpose of this study was to compare short term in vitro and in vivo biodegradation studies with low purity Mg (> 99.94 %), Mg-10Gd and Mg-2Ag designed for biodegradable implant applications. Three in vitro testing conditions were applied, using (i) phosphate buffered saline (PBS), (ii) Hank's balanced salt solution (HBSS) and (iii) Dulbecco's modified eagle medium (DMEM) in 5 % CO2 under sterile conditions. Gas evolution and mass loss (ML) were assessed, as well as the degradation layer, by elemental mapping and scanning electron microscopy (SEM)...
February 13, 2017: European Cells & Materials
https://www.readbyqxmd.com/read/28183676/tizrnbtamo-high-entropy-alloy-designed-for-orthopedic-implants-as-cast-microstructure-and-mechanical-properties
#3
Shao-Ping Wang, Jian Xu
Combining the high-entropy alloy (HEA) concept with property requirement for orthopedic implants, we designed a Ti20Zr20Nb20Ta20Mo20 equiatomic HEA. The arc-melted microstructures, compressive properties and potentiodynamic polarization behavior in phosphate buffer solution (PBS) were studied in detail. It was revealed that the as-cast TiZrNbTaMo HEA consisted of dual phases with bcc structure, major bcc1 and minor bcc2 phases with the lattice parameters of 0.3310nm and 0.3379nm, respectively. As confirmed by nanoindentation tests, the bcc1 phase is somewhat harder and stiffer than the bcc2 phase...
April 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28183674/albumin-coatings-by-alternating-current-electrophoretic-deposition-for-improving-corrosion-resistance-and-bioactivity-of-titanium-implants
#4
Sarah Höhn, Annabel Braem, Bram Neirinck, Sannakaisa Virtanen
Although Ti alloys are generally regarded to be highly corrosion resistant, inflammatory conditions following surgery can instigate breakdown of the TiO2 passivation layer leading to an increased metal ion release. Furthermore proteins present in the surrounding tissue will readily adsorb on a titanium surface after implantation. In this paper alternating current electrophoretic deposition (AC-EPD) of bovine serum albumin (BSA) on Ti6Al4V was investigated in order to increase the corrosion resistance and control the protein adsorption capability of the implant surface...
April 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28183670/influence-of-different-grained-powders-and-pellets-made-of-niobium-and-ti-42nb-on-human-cell-viability
#5
Jana Markhoff, Markus Weinmann, Christian Schulze, Rainer Bader
Nowadays, biomaterials can be used to maintain or replace several functions of the human body if necessary. Titanium and its alloys, i.e. Ti6Al4V are the most common materials (70 to 80%) used for structural orthopedic implants due to their unique combination of good mechanical properties, corrosion resistance and biocompatibility. Addition of β-stabilizers, e.g. niobium, can improve the mechanical properties of such titanium alloys further, simultaneously offering excellent biocompatibility. In this in vitro study, human osteoblasts and fibroblasts were cultured on different niobium specimens (Nb Amperit, Nb Ampertec), Nb sheets and Ti-42Nb (sintered and 3D-printed by selective laser melting, SLM) and compared with forged Ti6Al4V specimens...
April 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28183601/fabrication-of-biodegradable-zn-al-mg-alloy-mechanical-properties-corrosion-behavior-cytotoxicity-and-antibacterial-activities
#6
H R Bakhsheshi-Rad, E Hamzah, H T Low, M Kasiri-Asgarani, S Farahany, E Akbari, M H Cho
In this work, binary Zn-0.5Al and ternary Zn-0.5Al-xMg alloys with various Mg contents were investigated as biodegradable materials for implant applications. Compared with Zn-0.5Al (single phase), Zn-0.5Al-xMg alloys consisted of the α-Zn and Mg2(Zn, Al)11 with a fine lamellar structure. The results also revealed that ternary Zn-Al-Mg alloys presented higher micro-hardness value, tensile strength and corrosion resistance compared to the binary Zn-Al alloy. In addition, the tensile strength and corrosion resistance increased with increasing the Mg content in ternary alloys...
April 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28167873/corrosion-of-the-head-stem-taper-junction-are-we-on-the-verge-of-an-epidemic-review-article
#7
REVIEW
Michael Morlock, Dennis Bünte, Julian Gührs, Nicholas Bishop
BACKGROUND: The modular head taper junction has contributed to the success of total hip arthroplasty (THA) greatly. Taper corrosion and wear problems reported for large and extra-large metal-on-metal bearings as well as for bi-modular THA stems have cast doubt on the benefit of the taper interface. Presently, corrosion problems are being reported for nearly all kinds of artificial hip joints incorporating metal heads, questioning taper connections in general. QUESTIONS/PURPOSES: This study aimed to review the mechanical and electrochemical relationships that may lead to taper corrosion, which have been reported more commonly in recent literature, and to also review the contribution of patient characteristics and surgical techniques involved in taper assembly that may contribute to the problem...
February 2017: HSS Journal: the Musculoskeletal Journal of Hospital for Special Surgery
https://www.readbyqxmd.com/read/28167822/accelerating-corrosion-of-pure-magnesium-co-implanted-with-titanium-in-vivo
#8
Peng Hou, Pei Han, Changli Zhao, Hongliu Wu, Jiahua Ni, Shaoxiang Zhang, Jingyi Liu, Yuanzhuang Zhang, Haidong Xu, Pengfei Cheng, Shen Liu, Yufeng Zheng, Xiaonong Zhang, Yimin Chai
Magnesium is a type of reactive metal, and is susceptible to galvanic corrosion. In the present study, the impact of coexistence of Ti on the corrosion behavior of high purity Mg (HP Mg) was investigated both in vitro and in vivo. Increased corrosion rate of HP Mg was demonstrated when Mg and Ti discs were not in contact. The in vivo experiments further confirmed accelerating corrosion of HP Mg screws when they were co-implanted with Ti screws into Sprague-Dawley rats' femur, spacing 5 and 10 mm. Micro CT scan and 3D reconstruction revealed severe corrosion morphology of HP Mg screws...
February 7, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28161662/release-of-metal-ions-from-nano-cocrmo-wear-debris-generated-from-tribo-corrosion-processes-in-artificial-hip-implants
#9
Yang Wang, Yu Yan, Yanjing Su, Lijie Qiao
CoCrMo alloys have been widely used in metal-on-metal (MoM) hip replacements due to their superior wear and corrosion resistance properties. However, metal ions like Co(2+) and Cr(3+), or even Cr(6+) released from CoCrMo hip prostheses can induce macrophage apoptotic vs. necrotic mortality and damage the surrounding tissues. Simultaneously, osteolysis induced by the wear debris can be a cause of failure. Nano wear debris is more active than the bulk material, due to its small size. In this study, to accurately analyse the fresh wear debris retrieved from the hip simulator and the interaction between the particles and tribocorrosion of CoCrMo, wear debris was observed without protein digest, using a combined experimental approach involving the employment of TEM and ICP-MS...
January 30, 2017: Journal of the Mechanical Behavior of Biomedical Materials
https://www.readbyqxmd.com/read/28159679/is-there-a-role-for-femoral-offset-restoration-during-total-hip-arthroplasty-a-systematic-review
#10
REVIEW
Marcello De Fine, Matteo Romagnoli, Angelo Toscano, Alice Bondi, Matteo Nanni, Stefano Zaffagnini
BACKGROUND: Benefits of femoral offset restoration during total hip arthroplasty should be the reduction of bearing surfaces wear, implant loosening and dislocation rates. Modular neck stems ensure offset customization, but fretting corrosion and catastrophic failures are well documented complications. Since clinical evidences are needed to substantiate the effectiveness of femoral offset restoration and promote modular neck choice, we systematically reviewed the literature to ascertain whether femoral offsetitself has a proven clinical influence: 1) on bearing surfaces wear, 2) implant loosening, 3) and dislocation rates...
January 31, 2017: Orthopaedics & Traumatology, Surgery & Research: OTSR
https://www.readbyqxmd.com/read/28157596/fabrication-and-evaluation-of-bulk-nanostructured-cobalt-intended-for-dental-and-orthopedic-implants
#11
Fuzeng Ren, Weiwei Zhu, Kangjie Chu
Bulk nanostructured cobalt (Co) was fabricated by a combination of high energy ball milling and warm pressing. The obtained cobalt has an average grain size of 35nm with measured hardness and elastic modulus of 7.32GPa and 211.4GPa, respectively. Dry sliding wear testing shows such bulk nanostructured Co has high sliding wear resistance. However, electrochemical study shows that such Co has a relatively high corrosion rate and no passive behavior in the artificial saliva solution. X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS) analysis further reveal that the corrosion product is composed of insoluble cobalt (II) phosphate and cobalt hydroxide...
January 25, 2017: Journal of the Mechanical Behavior of Biomedical Materials
https://www.readbyqxmd.com/read/28152443/diamond-like-carbon-coatings-with-zirconium-containing-interlayers-for-orthopedic-implants
#12
Dipankar Choudhury, Juergen Lackner, Robert A Fleming, Josh Goss, Jingyi Chen, Min Zou
Six types of diamond-like carbon (DLC) coatings with zirconium (Zr)-containing interlayers on titanium alloy (Ti-6Al-4V) were investigated for improving the biotribological performance of orthopedic implants. The coatings consist of three layers: above the substrate a layer stack of 32 alternating Zr and ZrN sublayers (Zr:ZrN), followed by a layer comprised of Zr and DLC (Zr:DLC), and finally a N-doped DLC layer. The Zr:ZrN layer is designed for increasing load carrying capacity and corrosion resistance; the Zr:DLC layer is for gradual transition of stress, thus enhancing layer adhesion; and the N-doped DLC layer is for decreasing friction, squeaking noises and wear...
January 20, 2017: Journal of the Mechanical Behavior of Biomedical Materials
https://www.readbyqxmd.com/read/28130871/evaluation-of-wrought-zn-al-alloys-1-3-and-5-wt-al-through-mechanical-and-in-vivo-testing-for-stent-applications
#13
Patrick K Bowen, Jan-Marten Seitz, Roger J Guillory, Jacob P Braykovich, Shan Zhao, Jeremy Goldman, Jaroslaw W Drelich
Special high grade zinc and wrought zinc-aluminum (Zn-Al) alloys containing up to 5.5 wt % Al were processed, characterized, and implanted in rats in search of a new family of alloys with possible applications as bioabsorbable endovascular stents. These materials retained roll-induced texture with an anisotropic distribution of the second-phase Al precipitates following hot-rolling, and changes in lattice parameters were observed with respect to Al content. Mechanical properties for the alloys fell roughly in line with strength (190-240 MPa yield strength; 220-300 MPa ultimate tensile strength) and elongation (15-30%) benchmarks, and favorable elastic ranges (0...
January 27, 2017: Journal of Biomedical Materials Research. Part B, Applied Biomaterials
https://www.readbyqxmd.com/read/28130825/magnesium-alloy-az91-exhibits-antimicrobial-properties-in-vitro-but-not-in-vivo
#14
Emily K Brooks, Richard Ahn, Menachem E Tobias, Lisa A Hansen, Nicole R Luke-Marshall, Linda Wild, Anthony A Campagnari, Mark T Ehrensberger
Magnesium alloys hold great promise for developing orthopedic implants that are biocompatible, biodegradable, and mechanically similar to bone tissue. This study evaluated the in vitro and in vivo antimicrobial properties of magnesium-9%aluminum-1%zinc (AZ91) and commercially pure titanium (cpTi) against Acinetobacter baumannii (Ab307). The in vitro results showed that as compared to cpTi, incubation with AZ91 significantly reduced both the planktonic (cpTi = 3.45e8, AZ91 = 8.97e7, p < 0.001) colony forming units (CFU) and biofilm-associated (cpTi = 3...
January 27, 2017: Journal of Biomedical Materials Research. Part B, Applied Biomaterials
https://www.readbyqxmd.com/read/28111124/do-stem-taper-microgrooves-influence-taper-corrosion-in-total-hip-arthroplasty-a-matched-cohort-retrieval-study
#15
Christina M Arnholt, Daniel W MacDonald, Richard J Underwood, Eric P Guyer, Clare M Rimnac, Steven M Kurtz, Michael A Mont, Gregg R Klein, Gwo-Chin Lee, Antonia F Chen, Brian R Hamlin, Harold E Cates, Arthur L Malkani, Matthew J Kraay
BACKGROUND: Previous studies identified imprinting of the stem morphology onto the interior head bore, leading researchers to hypothesize an influence of taper topography on mechanically assisted crevice corrosion. The purpose of this study was to analyze whether microgrooved stem tapers result in greater fretting corrosion damage than smooth stem tapers. METHODS: A matched cohort of 120 retrieved head-stem pairs from metal-on-polyethylene bearings was created controlling for implantation time, flexural rigidity, apparent length of engagement, and head size...
November 17, 2016: Journal of Arthroplasty
https://www.readbyqxmd.com/read/28108957/effect-of-temperature-on-surface-characteristics-of-nitrogen-ion-implanted-biocompatible-titanium
#16
Hossein Aghajani, Mohsen Sadeghpour Motlagh
It has been established that nitrogen implantation can modify metals surface properties such as corrosion, wear, friction, etc. Recent studies have shown that nitrogen implantation into titanium and its alloys leads to the formation of titanium nitride, which has interesting biological, chemical, and mechanical properties. In the present investigation, commercially pure biocompatible titanium implanted by nitrogen. Implantation of ions performed at 80 keV and a dose of 2.1 × 10(18) ions/cm(2) at four different temperatures of 300, 473, 673 and 873 k...
February 2017: Journal of Materials Science. Materials in Medicine
https://www.readbyqxmd.com/read/28108751/-compatibility-and-allergies-of-osteosynthesis-materials
#17
M Thomsen, P Thomas
Metal implants for osteosynthesis are nowadays standard in orthopedic and trauma surgery. Steel implants, especially cerclages, bands and wires, can show more corrosion due to friction and lead to encapsulation in connective tissue with fluid borders even without loosening. Corrosion and fluid borders are potentially more susceptible to incompatibility and infections. Titanium implants have the advantage of better allergic compatibility. Problems may occur in material removal, especially with titanium implants because material fractures occur more frequently...
January 20, 2017: Der Unfallchirurg
https://www.readbyqxmd.com/read/28102447/analysing-a-mechanism-of-failure-in-retrieved-magnetically-controlled-spinal-rods
#18
Vasiliki C Panagiotopoulou, Stewart K Tucker, Robert K Whittaker, Harry S Hothi, Johann Henckel, Julian J H Leong, Thomas Ember, John A Skinner, Alister J Hart
PURPOSE: We aim to describe a mechanism of failure in magnetically controlled growth rods which are used for the correction of the early onset scoliosis. METHODS: This retrieval study involved nine magnetically controlled growth rods, of a single design, revised from five patients for metal staining, progression of scoliosis, swelling, fractured actuator pin, and final fusion. All the retrieved rods were radiographed and assessed macroscopically and microscopically for material loss...
January 19, 2017: European Spine Journal
https://www.readbyqxmd.com/read/28087160/mri-retrieval-analysis-and-histologic-evaluation-of-adverse-local-tissue-reaction-in-metal-on-polyethylene-total-hip-arthroplasty
#19
Scott R Nodzo, Christina I Esposito, Hollis G Potter, Chitranjan S Ranawat, Timothy M Wright, Douglas E Padgett
BACKGROUND: The severity and location of adverse local tissue reaction (ALTR) seen in metal-on-polyethylene total hip arthroplasty (THA) is not well described. METHODS: We retrospectively reviewed the records of patients who underwent a revision THA using our biomechanics database. We included all patients who underwent revision surgery for the diagnosis of ALTR with THA implants that had modularity solely at the head-neck junction and excluded patients with implant modularity at sites other than the head-neck junction...
December 8, 2016: Journal of Arthroplasty
https://www.readbyqxmd.com/read/28073074/tribocorrosion-behavior-of-bio-functionalized-highly-porous-titanium
#20
F Toptan, A C Alves, A M P Pinto, P Ponthiaux
Titanium and its alloys are widely used in orthopedic and dental implants, however, some major clinical concerns such as poor wear resistance, lack of bioactivity, and bone resorption due to stress shielding are yet to be overcome. In order to improve these drawbacks, highly porous Ti samples having functionalized surfaces were developed by powder metallurgy with space holder technique followed by anodic treatment. Tribocorrosion tests were performed in 9g/L NaCl solution using a unidirectional pin-on-disc tribometer under 3N normal load, 1Hz frequency and 4mm track diameter...
January 4, 2017: Journal of the Mechanical Behavior of Biomedical Materials
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