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titanium corrosion

João Gabriel Silva Souza, Thamara Beline, Adaias Oliveira Matos, Bárbara Emanoele Costa Oliveira, Antônio Pedro Ricomini-Filho, Valentim Adelino Ricardo Barão
STATEMENT OF PROBLEM: Biofilms can reduce the corrosion resistance of titanium because of the bacterial metabolism of fermentable carbohydrates, including sucrose. However, studies evaluating whether biofilms exposed to higher sucrose concentrations can affect the electrochemical behavior of titanium are lacking. PURPOSE: The purpose of this in vitro study was to test the electrochemical behavior of titanium previously exposed to biofilm supplemented with different sucrose concentrations...
March 15, 2018: Journal of Prosthetic Dentistry
Nayereh Askari, Mardali Yousefpour, Masoud Rajabi
In this research work hydroxyapatite/alumina/YSZ bio nanocomposite coatings on titanium substrate were created by electrophoretic deposition (EPD) and reaction bonding process. By using the EPD process, uniform green form coatings containing HA, YSZ and aluminum particles were produced on titanium. After oxidation of aluminum at 660 ˚C and sintering at 850 ˚C, a dense and adherent HA/Al2 O3 /YSZ coating was produced. Scanning electron microscopy (SEM), X-ray diffractometric (XRD) and mechanical tests were employed to investigate the morphologies, compositions, hardness, toughness and bonding strength of the coatings...
March 13, 2018: Journal of Biomedical Materials Research. Part A
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
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
Georgios Polychronis, Youssef S Al Jabbari, Theodore Eliades, Spiros Zinelis
OBJECTIVES: The aim of this research was to assess galvanic behavior of lingual orthodontic brackets coupled with representative types of orthodontic wires. MATERIALS AND METHODS: Three types of lingual brackets: Incognito (INC), In-Ovation L (IOV), and STb (STB) were combined with a stainless steel (SS) and a nickel-titanium (NiTi) orthodontic archwire. All materials were initially investigated by scanning electron microscopy / x-ray energy dispersive spectroscopy (SEM/EDX) while wires were also tested by x-ray diffraction spectroscopy (XRD)...
March 6, 2018: Angle Orthodontist
Hong Ju, Yuan-Feng Yang, Yun-Fei Liu, Shu-Fa Liu, Jin-Zhuo Duan, Yan Li
The local electrochemical properties of galvanic corrosion for three coupled metals in a desalination plant were investigated with three wire-beam electrodes as wire sensors: aluminum brass (HAl77-2), titanium (TA2), and 316L stainless steel (316L SS). These electrodes were used with artificial seawater at different temperatures. The potential and current-density distributions of the three-metal coupled system are inhomogeneous. The HAl77-2 wire anodes were corroded in the three-metal coupled system. The TA2 wires acted as cathodes and were protected; the 316L SS wires acted as secondary cathodes...
February 28, 2018: Materials
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
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
T Fu, F Zhang, Z Alajmi, S Y Yang, F Wu, S L Han
ZnO and Ag-containing ZnO (ZnO/Ag) films with the Ag/Zn molar ratio of 3.3 and 9.1%, respectively were sol-gel coated on biomedical titanium for antibacterial and bioactive surface modification. X-ray diffraction analysis indicates that ZnO peaks increase with the calcination temperature of the samples. Scanning electron microscopy and energy dispersive of X-ray analyses reveal Ag-rich white particles (300~750 nm) on ZnO/Ag samples that were calcined at 400 °C. X-ray photoelectron spectroscopy analysis of ZnO/Ag samples shows that Zn and O exist as ZnO and Ag presents in metallic state...
February 1, 2018: Journal of Nanoscience and Nanotechnology
Jiajia Xiao, Po Li, Xiaogang Wen
Novel jujube-like hierarchical TiO2 microspheres (HTM) were synthesized by an alkali corrosion process of titanium phosphate (Ti2O3(H2PO4)2·2H2O) microspheres. The hierarchical titanium phosphate microspheres (HTPM) intermediates consisting of nanoflakes with a thickness of 20 nm were prepared firstly by a facile hydrothermal method. After reacting with diluted NaOH at low temperature and atmospheric pressure,following by subsequent acid washing and calcination process, the HTPM intermediates transformed to TiO2 with well remained microsphere morphology, while the nanoflakes became porous, and some new nanowires formed between the nanoflakes...
February 15, 2018: Nanotechnology
Yong Huang, Xue Shen, Haixia Qiao, Hao Yang, Xuejiao Zhang, Yiyao Liu, Hejie Yang
Background: Two frequent problems associated with titanium (Ti) surfaces of bone/dental implants are their corrosion and lack of native tissue integration. Methods: Here, we present an anodization-hydrothermal method for coating Ti surfaces with a layer of silicon (Si)- and strontium (Sr)-loaded titania nanotubes (TNs). The Ti surfaces coated with such a layer (Si-Sr-TNs) were characterized with different techniques. Results: The results indicate that the Si 4+ and Sr 2+ ions were evenly incorporated into the TNs and that the Si-Sr-TN layer provides good protection against corrosive media like simulated body fluid...
2018: International Journal of Nanomedicine
Alethea Liens, Aurélien Etiemble, Pascaline Rivory, Sandra Balvay, Jean-Marc Pelletier, Sandrine Cardinal, Damien Fabrègue, Hidemi Kato, Philippe Steyer, Tais Munhoz, Jerome Adrien, Nicolas Courtois, Daniel J Hartmann, Jérôme Chevalier
Ti40Zr10Cu36Pd14 Bulk Metallic Glass (BMG) appears very attractive for future biomedical applications thanks to its high glass forming ability, the absence of toxic elements such as Ni, Al or Be and its good mechanical properties. For the first time, a complete and exhaustive characterization of a unique batch of this glassy alloy was performed, together with ISO standard mechanical tests on machined implant-abutment assemblies. The results were compared to the benchmark Ti-6Al-4V ELI (Extra-Low-Interstitial) to assess its potential in dental implantology...
February 6, 2018: Materials
Ilona Swiatkowska, J Fred W Mosselmans, Tina Geraki, Cody C Wyles, Joseph J Maleszewski, Johann Henckel, Barry Sampson, Dominic B Potter, Ibtisam Osman, Robert T Trousdale, Alister J Hart
BACKGROUND: Orthopaedic implants made of cobalt-chromium alloy undergo wear and corrosion that can lead to deposition of cobalt and chromium in vital organs. Elevated cardiac tissue cobalt levels are associated with myocardial injury while chromium is a well-established genotoxin. Though metal composition of tissues surrounding hip implants has been established, few investigators attempted to characterize the metal deposits in systemic tissues of total joint arthroplasty patients. METHODS: We report the first use of micro-X-ray fluorescence coupled with micro-X-ray absorption spectroscopy to probe distribution and chemical form of cobalt, chromium and titanium in postmortem samples of splenic, hepatic and cardiac tissue of patients with metal-on-polyethylene hip implants (n = 5)...
March 2018: Journal of Trace Elements in Medicine and Biology
AmirHossein Mirhashemi, Sahar Jahangiri, MohammadJavad Kharrazifard
BACKGROUND: Corrosion resistance is an important requirement for orthodontic appliances. Nickel and chromium may be released from orthodontic wires and can cause allergic reactions and cytotoxicity when patients use various mouthwashes to whiten their teeth. Our study aimed to assess the release of nickel and chromium ions from nickel titanium (NiTi) and stainless steel (SS) orthodontic wires following the use of four common mouthwashes available on the market. METHODS: This in vitro, experimental study was conducted on 120 orthodontic appliances for one maxillary quadrant including five brackets, one band and half of the required length of SS, and NiTi wires...
February 5, 2018: Progress in Orthodontics
Oki Suwarsa, Rachel Marsella Rahardjo, Endang Sutedja, Hartati Purbo Dharmadji, Reti Hindritiani, Hendra Gunawan
RATIONALE: Corrosion refers to the degradation of a material that occurs following its interaction with other substances in the environment. Corrosion of metallic substances into tissues may lead to inflammatory responses such as systemic contact dermatitis (SCD), a skin condition where an individual who has previously been sensitized to a particular allergen via the cutaneous route will subsequently react to same allergen via the systemic route. This condition occurs following exposure to allergens such as metals, medications, and certain food substances...
December 2017: Medicine (Baltimore)
Wen-Qing Zhu, Pan-Pan Ming, Jing Qiu, Shui-Yi Shao, Ying-Juan Yu, Jia-Xi Chen, Jie Yang, Li-Na Xu, Song-Mei Zhang, Chun-Bo Tang
Titanium (Ti) and its corresponding alloys have been widely applied in dental and orthopedic implants. Owing to abrasion and corrosion of implants in the unfavorable electrolytic aqueous environment of the host body, Ti ions could be released from implants and accumulated in local tissues. Recent studies have found that excessive Ti ions were toxic to osteoblasts in adjacent bone tissues and subsequently influenced long-term effects on implant prostheses. However, the potential molecular mechanisms underlying the damage to osteoblasts induced by Ti ions remained unclear...
January 29, 2018: Journal of Applied Toxicology: JAT
Ana Mellado-Valero, Anna Igual Muñoz, Virginia Guiñón Pina, Ma Fernanda Sola-Ruiz
The aim of the present study is to analyze the electrochemical behavior of five different dental alloys: two cobalt-chromium alloys (CoCr and CoCr-c), one nickel-chromium-titanium alloy (NiCrTi), one gold-palladium alloy (Au), and one titanium alloy (Ti6Al4V), and the galvanic effect when they are coupled to titanium implants (TiG2). It was carried out by electrochemical techniques (open circuit measurements, potentiodynamic curves and Zero-Resistance Ammetry) in artificial saliva (AS), with and without fluorides in different acidic conditions...
January 22, 2018: Materials
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