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Wang L, Wang F, Ayisen S, Ren T, Luo X, Wang P. Enhancing the mechanical properties and surface morphology of individualized Ti-mesh fabricated through additive manufacturing for the treatment of alveolar bone defects. Front Bioeng Biotechnol 2023; 11:1284359. [PMID: 38026903 PMCID: PMC10657841 DOI: 10.3389/fbioe.2023.1284359] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/28/2023] [Accepted: 10/23/2023] [Indexed: 12/01/2023] Open
Abstract
Titanium meshes are widely utilized in alveolar bone augmentation, and this study aims to enhance the properties of titanium meshes through heat treatment (HT) and the synergistic finishing technology of electric field and flow field (EFSF). Our findings illustrate that the titanium mesh exhibits improved mechanical properties following HT treatment. The innovative EFSF technique, in combination with HT, has a substantial impact on improving the surface properties of titanium meshes. HT initiates grain fusion and reduces surface pores, resulting in enhanced tensile and elongation properties. EFSF further enhances these improvements by significantly reducing surface roughness and eliminating adhered titanium powder, a byproduct of selective laser melting printing. Increased hydrophilicity and surface-free energy are achieved after EFSF treatment. Notably, the EFSF-treated titanium mesh exhibits reduced bacterial adhesion and is non-toxic to osteoblast proliferation. These advancements increase its suitability for clinical alveolar bone augmentation.
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Affiliation(s)
- Lingxu Wang
- School of Stomatology, Xuzhou Medical University, Xuzhou, China
| | - Fangfang Wang
- School of Stomatology, Nanjing University, Nanjing, China
| | - Saimi Ayisen
- School of Stomatology, Nanjing University, Nanjing, China
| | - Tianshui Ren
- School of Stomatology, Xuzhou Medical University, Xuzhou, China
| | - Xiaoping Luo
- School of Stomatology, Nanjing University, Nanjing, China
| | - Penglai Wang
- School of Stomatology, Xuzhou Medical University, Xuzhou, China
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Grubova IY, Surmenev RA, Neyts EC, Koptyug AV, Volkova AP, Surmeneva MA. Combined First-Principles and Experimental Study on the Microstructure and Mechanical Characteristics of the Multicomponent Additive-Manufactured Ti-35Nb-7Zr-5Ta Alloy. ACS OMEGA 2023; 8:27519-27533. [PMID: 37546645 PMCID: PMC10399164 DOI: 10.1021/acsomega.3c03157] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/08/2023] [Accepted: 07/03/2023] [Indexed: 08/08/2023]
Abstract
New β-stabilized Ti-based alloys are highly promising for bone implants, thanks in part to their low elasticity. The nature of this elasticity, however, is as yet unknown. We here present combined first-principles DFT calculations and experiments on the microstructure, structural stability, mechanical characteristics, and electronic structure to elucidate this origin. Our results suggest that the studied β Ti-35Nb-7Zr-5Ta wt % (TNZT) alloy manufactured by the electron-beam powder bed fusion (E-PBF) method has homogeneous mechanical properties (H = 2.01 ± 0.22 GPa and E = 69.48 ± 0.03 GPa) along the building direction, which is dictated by the crystallographic texture and microstructure morphologies. The analysis of the structural and electronic properties, as the main factors dominating the chemical bonding mechanism, indicates that TNZT has a mixture of strong metallic and weak covalent bonding. Our calculations demonstrate that the softening in the Cauchy pressure (C' = 98.00 GPa) and elastic constant C̅44 = 23.84 GPa is the origin of the low elasticity of TNZT. Moreover, the nature of this softening phenomenon can be related to the weakness of the second and third neighbor bonds in comparison with the first neighbor bonds in the TNZT. Thus, the obtained results indicate that a carefully designed TNZT alloy can be an excellent candidate for the manufacturing of orthopedic internal fixation devices. In addition, the current findings can be used as guidance not only for predicting the mechanical properties but also the nature of elastic characteristics of the newly developed alloys with yet unknown properties.
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Affiliation(s)
- Irina Yu. Grubova
- Physical
Materials Science and Composite Materials Centre, Research School
of Chemistry & Applied Biomedical Sciences, National Research Tomsk Polytechnic University, 30 Lenina Avenue, Tomsk 634050, Russia
| | - Roman A. Surmenev
- Physical
Materials Science and Composite Materials Centre, Research School
of Chemistry & Applied Biomedical Sciences, National Research Tomsk Polytechnic University, 30 Lenina Avenue, Tomsk 634050, Russia
| | - Erik C. Neyts
- Department
of Chemistry, PLASMANT Research Group, NANOlab Center of Excellence, University of Antwerp, Universiteitsplein 1, Wilrijk, B-2610 Antwerp, Belgium
| | - Andrey V. Koptyug
- Sports
Tech Research Centre, Mid Sweden University, Akademigatan 1, SE-831 25 Östersund, Sweden
| | - Anastasia P. Volkova
- Physical
Materials Science and Composite Materials Centre, Research School
of Chemistry & Applied Biomedical Sciences, National Research Tomsk Polytechnic University, 30 Lenina Avenue, Tomsk 634050, Russia
| | - Maria A. Surmeneva
- Physical
Materials Science and Composite Materials Centre, Research School
of Chemistry & Applied Biomedical Sciences, National Research Tomsk Polytechnic University, 30 Lenina Avenue, Tomsk 634050, Russia
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Školáková A, Körberová J, Málek J, Rohanová D, Jablonská E, Pinc J, Salvetr P, Gregorová E, Novák P. Microstructural, Mechanical, Corrosion and Cytotoxicity Characterization of Porous Ti-Si Alloys with Pore-Forming Agent. MATERIALS 2020; 13:ma13245607. [PMID: 33316967 PMCID: PMC7764597 DOI: 10.3390/ma13245607] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/12/2020] [Revised: 12/03/2020] [Accepted: 12/07/2020] [Indexed: 11/17/2022]
Abstract
Titanium and its alloys belong to the group of materials used in implantology due to their biocompatibility, outstanding corrosion resistance and good mechanical properties. However, the value of Young’s modulus is too high in comparison with the human bone, which could result in the failure of implants. This problem can be overcome by creating pores in the materials, which, moreover, improves the osseointegration. Therefore, TiSi2 and TiSi2 with 20 wt.% of the pore-forming agent (PA) were prepared by reactive sintering and compared with pure titanium and titanium with the addition of various PA content in this study. For manufacturing implants (especially augmentation or spinal replacements), titanium with PA seemed to be more suitable than TiSi2 + 20 wt.% PA. In addition, titanium with 30 or 40 wt.% PA contained pores with a size allowing bone tissue ingrowth. Furthermore, Ti + 30 wt.% PA was more suitable material in terms of corrosion resistance; however, its Young’s modulus was higher than that of the human bone while Ti + 40 wt.% PA had a Young’s modulus close to the human bone.
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Affiliation(s)
- Andrea Školáková
- Department of Metals and Corrosion Engineering, University of Chemistry and Technology Prague, Technická 5, 166 28 Prague 6, Czech Republic; (J.K.); (J.P.); (P.S.); (P.N.)
- Correspondence: ; Tel.: +420-220-444-055
| | - Jana Körberová
- Department of Metals and Corrosion Engineering, University of Chemistry and Technology Prague, Technická 5, 166 28 Prague 6, Czech Republic; (J.K.); (J.P.); (P.S.); (P.N.)
| | - Jaroslav Málek
- UJP Praha a.s., Nad Kamínkou 1345, 156 10 Prague 16, Zbraslav, Czech Republic;
| | - Dana Rohanová
- Department of Glass and Ceramics, University of Chemistry and Technology Prague, Technická 5, 166 28 Prague 6, Czech Republic; (D.R.); (E.G.)
| | - Eva Jablonská
- Department of Biochemistry and Microbiology, University of Chemistry and Technology Prague, Technická 5, 166 28 Prague 6, Czech Republic;
| | - Jan Pinc
- Department of Metals and Corrosion Engineering, University of Chemistry and Technology Prague, Technická 5, 166 28 Prague 6, Czech Republic; (J.K.); (J.P.); (P.S.); (P.N.)
| | - Pavel Salvetr
- Department of Metals and Corrosion Engineering, University of Chemistry and Technology Prague, Technická 5, 166 28 Prague 6, Czech Republic; (J.K.); (J.P.); (P.S.); (P.N.)
| | - Eva Gregorová
- Department of Glass and Ceramics, University of Chemistry and Technology Prague, Technická 5, 166 28 Prague 6, Czech Republic; (D.R.); (E.G.)
| | - Pavel Novák
- Department of Metals and Corrosion Engineering, University of Chemistry and Technology Prague, Technická 5, 166 28 Prague 6, Czech Republic; (J.K.); (J.P.); (P.S.); (P.N.)
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Development of Zirconium-Based Alloys with Low Elastic Modulus for Dental Implant Materials. APPLIED SCIENCES-BASEL 2019. [DOI: 10.3390/app9245281] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
The stress-shielding effect is a phenomenon in which the mutual coupling between bones and bio-materials of the human body is loosened due to the difference in elastic modulus, and bone absorption occurs due to the difference in density, which causes a shortening of the life of the material. The purpose of this study is to develop a zirconium-based alloy with low modulus and to prevent the stress-shielding effect. Zr–7Cu–xSn (x = 1, 5, 10, 15 mass%) alloys were prepared by an arc-melting process of pure zirconium, oxygen-free copper, and tin, respectively. The Zr–7Cu–xSn alloy has two phase α-Zr and Zr2Cu intermetallic compounds. Microstructure characterization was analyzed by microscopy and X-ray diffraction. Corrosion tests of zirconium-based alloys were conducted through polarization tests, and zirconium-based alloys had better corrosion characteristics than other metal bio-materials. In general, the elastic modulus value (14–25 GPa) of the zirconium-based alloy is very similar to the elastic modulus value (15–30 GPa) of the human bone. Consequently, the zirconium-based alloy is likely to be used as a bio-material that negates the effect of stress shielding on human bones.
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Semetse L, Obadele BA, Raganya L, Geringer J, Olubambi PA. Fretting corrosion behaviour of Ti-6Al-4V reinforced with zirconia in foetal bovine serum. J Mech Behav Biomed Mater 2019; 100:103392. [PMID: 31430704 DOI: 10.1016/j.jmbbm.2019.103392] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/10/2019] [Revised: 07/08/2019] [Accepted: 08/06/2019] [Indexed: 01/09/2023]
Abstract
Fretting corrosion is a critical challenge in the design of hip prosthesis used in total hip arthroplasty (THA) surgeries. Currently, the design of hip implants includes a tapered junction which introduces additional interfaces that connect different parts of the hip implant such as the femoral neck and head or stem and neck interface. Micro motions that occur under the influence of load, together with chemical changes in the host environment, make these interfaces susceptible to tribocorrosion processes, particularly fretting corrosion. Commonly used metallic biomaterials are based on stainless steels, cobalt chrome-based alloys as well as titanium and titanium alloys. Each of these materials possess some degree of limitations, particularly where tribocorrosion events are concerned. Titanium alloy Ti-6Al-4V is widely used in biomedical applications for non-bearing components of total joint arthroplasty (TJA) surgeries. Its poor wear resistance continues to remain a challenge in load-bearing joints where parts articulate against one another as in the case of modular junctions. Some of the attempts made to improve the wear properties of Ti-6Al-4V is through the incorporation of second phase particles like ceramics in its matrix to produce metal matrix composites of Ti-6Al-4V. The aim of this work is to investigate the effect of zirconia reinforcement on spark plasma sintered Ti-6Al-4V composites (zirconium oxide particles incorporated into Ti-6Al-4V matrix) on the fretting corrosion properties of Ti-6Al-4V. Fretting corrosion tests were carried out on as-sintered Ti-6Al-4V and Ti-6Al-4V with 5 and 10 wt.% ZrO2. The tests were carried out in foetal bovine serum under applied normal loads of 85 and 115 N using the cylinder-on-flat contact configuration. The evolution of OCP, dissipated energy and friction coefficient were recorded throughout the test. Microstructural analysis of the samples before fretting corrosion tests showed the presence of globular agglomerates throughout the Ti-6Al-4V matrix due to zirconia additions; the volume of the agglomerates was higher in the composites having 10 wt.% ZrO2. Ti-6Al-4V composites having zirconia additions produced a nobler OCP during fretting in foetal bovine serum, compared to pure Ti-6Al-4V. Furthermore, the fretting corrosion results showed a significant improvement in the tribocorrosion resistance of Ti-6Al-4V with 10 wt.% ZrO2 at all loads. This composition also produced the least amount of degradation. and metal ion release. Mechanical data showed that increasing the applied normal load promoted a transition from gross slip to partial slip conditions for all compositions. Partial slip was found to be prevalent at a higher normal load (drastic decrease of the dissipated energy and consequently the friction coefficient). This mechanical condition prevents a large amount of degradation.
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Affiliation(s)
- Lerato Semetse
- Centre for Nanoengineering and Tribocorrosion, School of Mining, Metallurgy and Chemical Engineering, University of Johannesburg, Doornfontein Campus, Johannesburg, South Africa.
| | - Babatunde Abiodun Obadele
- Centre for Nanoengineering and Tribocorrosion, School of Mining, Metallurgy and Chemical Engineering, University of Johannesburg, Doornfontein Campus, Johannesburg, South Africa
| | - Lerato Raganya
- Centre for Nanoengineering and Tribocorrosion, School of Mining, Metallurgy and Chemical Engineering, University of Johannesburg, Doornfontein Campus, Johannesburg, South Africa; Light Metals, Materials Science & Manufacturing, Council for Scientific and Industrial Research, Meiring Naudé Road, Brummeria, Pretoria, 0185, South Africa
| | - Jean Geringer
- Univ Lyon, IMT Mines Saint-Etienne, Centre CIS, [STBio] Univ Jean Monnet, INSERM, SainBioSE, F-42023, Saint-Etienne, France
| | - Peter Apata Olubambi
- Centre for Nanoengineering and Tribocorrosion, School of Mining, Metallurgy and Chemical Engineering, University of Johannesburg, Doornfontein Campus, Johannesburg, South Africa
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Bahadori F, Kocyigit A, Onyuksel H, Dag A, Topcu G. Cytotoxic, Apoptotic and Genotoxic Effects of Lipid-Based and Polymeric Nano Micelles, an In Vitro Evaluation. TOXICS 2017; 6:toxics6010007. [PMID: 29301191 PMCID: PMC5874780 DOI: 10.3390/toxics6010007] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/04/2017] [Revised: 12/26/2017] [Accepted: 12/29/2017] [Indexed: 12/17/2022]
Abstract
Self-assembly systems (SAS) mainly consist of micelles, and liposomes are the classes of Nano Drug Delivery Systems with superior properties compared to traditional therapeutics in targeting cancer tumors. All commercially available nano-formulations of chemotherapeutics currently consist of SAS. According to our knowledge, a specific toxicity comparison based on material differences has not yet been performed. The purpose of this study was to evaluate and compare the toxicity of two SAS consisting of Sterically Stabilized Micelles (SSM) made of a lipid-based amphiphilic distearoyl-sn-glycero-phosphatidylethanolamine-polyethylene glycol (PEG)-2000 and a polymeric micelle (PM) consisting of Y-shape amphiphilic block copolymer, synthesized using poly ε-caprolactone and PEG. The mechanism of cytotoxicity and genotoxicity of micelles on L-929 healthy mouse fibroblast cells was assessed using Sulforhodamine-B, WST-1, Acridine Orange/Ethidium Bromide and alkaline single-cell gel electrophoresis assays. Results showed that SSM in conc. of 40 mg/mL shows very low cytotoxicity at the end of 24, 48 and 72 h. The DNA damage caused by SSM was much lower than PM while the latter one showed significant toxicity by causing apoptosis with the ED50 value of 3 mg/mL. While the DNA damage caused by SSM was ignorable, some DNA chain breaks were detected on cells treated with PM.
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Affiliation(s)
- Fatemeh Bahadori
- Department of Pharmaceutical Biotechnology, Faculty of Pharmacy, Bezmialem Vakif University, Fatih, Istanbul 34093, Turkey.
| | - Abdurrahim Kocyigit
- Department of Medical Biochemistry, Faculty of Medicine, Bezmialem Vakif University, Istanbul 34093, Turkey.
| | - Hayat Onyuksel
- Department of Biopharmaceutical Sciences, University of Illinois at Chicago, Chicago, IL 60612, USA.
| | - Aydan Dag
- Department of Pharmaceutical Chemistry, Faculty of Pharmacy, Bezmialem Vakif University, Fatih, Istanbul 34093, Turkey.
| | - Gulacti Topcu
- Department of Pharmaceutical Biotechnology, Faculty of Pharmacy, Bezmialem Vakif University, Fatih, Istanbul 34093, Turkey.
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Cheng J, Xu J, Liu LL, Jiang S. Electrochemical Corrosion Behavior of Ta₂N Nanoceramic Coating in Simulated Body Fluid. MATERIALS (BASEL, SWITZERLAND) 2016; 9:E772. [PMID: 28773893 PMCID: PMC5457118 DOI: 10.3390/ma9090772] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/02/2016] [Revised: 09/01/2016] [Accepted: 09/03/2016] [Indexed: 01/22/2023]
Abstract
In order to improve the corrosion and wear resistance of biomedical Ti-6Al-4V implants, a Ta₂N nanoceramic coating was synthesized on a Ti-6Al-4V substrate by the double glow discharge plasma process. The Ta₂N coating, composed of fine nanocrystals, with an average grain size of 12.8 nm, improved the surface hardness of Ti-6Al-4V and showed good contact damage tolerance and good adhesion strength to the substrate. The corrosion resistance of the Ta₂N coating in Ringer's physiological solution at 37 °C was evaluated by different electrochemical techniques: potentiodynamic polarization, electrochemical impedance spectroscopy (EIS), potentiostatic polarization and capacitance measurements (Mott-Schottky approach). The evolution of the surface composition of the passive films at different applied potentials was determined by X-ray photoelectron spectroscopy (XPS). The results indicated that the Ta₂N coating showed higher corrosion resistance than both commercially pure Ta and uncoated Ti-6Al-4V in this solution, because of the formed oxide film on the Ta₂N coating having a smaller carrier density (Nd) and diffusivity (Do) of point defects. The composition of the surface passive film formed on the Ta₂N coating changed with the applied potential. At low applied potentials, the oxidation of the Ta₂N coating led to the formation of tantalum oxynitride (TaOxNy) but, subsequently, the tantalum oxynitride (TaOxNy) could be chemically converted to Ta₂O₅ at higher applied potentials.
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Affiliation(s)
- Jian Cheng
- Department of Material Science and Engineering, Nanjing University of Aeronautics and Astronautics, 29 Yudao Street, Nanjing 210016, China.
| | - Jiang Xu
- Department of Material Science and Engineering, Nanjing University of Aeronautics and Astronautics, 29 Yudao Street, Nanjing 210016, China.
- School of Mechanical & Electrical Engineering, Wuhan Institute of Technology, 693 Xiongchu Avenue, Wuhan 430073, China.
| | - Lin Lin Liu
- Department of Material Science and Engineering, Nanjing University of Aeronautics and Astronautics, 29 Yudao Street, Nanjing 210016, China.
| | - Shuyun Jiang
- Department of Mechanical Engineering, Southeast University, 2 Si Pai Lou, Nanjing 210096, China.
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Miotto LN, Fais LM, Ribeiro AL, Vaz LG. Surface properties of Ti-35Nb-7Zr-5Ta. J Prosthet Dent 2016; 116:102-11. [DOI: 10.1016/j.prosdent.2015.10.024] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2015] [Revised: 10/19/2015] [Accepted: 10/20/2015] [Indexed: 11/16/2022]
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10
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Hsu HC, Wu SC, Hsu SK, Li CT, Ho WF. Effects of chromium addition on structure and mechanical properties of Ti–5Mo alloy. ACTA ACUST UNITED AC 2015. [DOI: 10.1016/j.matdes.2014.09.077] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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11
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Tsao L. Effect of Sn addition on the corrosion behavior of Ti–7Cu–Sn cast alloys for biomedical applications. MATERIALS SCIENCE & ENGINEERING. C, MATERIALS FOR BIOLOGICAL APPLICATIONS 2015; 46:246-52. [DOI: 10.1016/j.msec.2014.10.037] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/11/2014] [Revised: 06/01/2014] [Accepted: 10/20/2014] [Indexed: 10/24/2022]
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12
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Liu L, Xu J, Munroe P, Xu J, Xie ZH. Electrochemical behavior of (Ti 1-x Nb x)5Si3 nanocrystalline films in simulated physiological media. Acta Biomater 2014; 10:1005-13. [PMID: 24076074 DOI: 10.1016/j.actbio.2013.09.021] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/22/2013] [Revised: 08/10/2013] [Accepted: 09/18/2013] [Indexed: 11/25/2022]
Abstract
In this paper, (Ti1-xNbx)5Si3 nanocrystalline films were synthesized and their potential as highly corrosion-resistant coatings for the biomedical alloy Ti-6Al-4V was explored. To assess the electrochemical behavior of the as-deposited films, the samples were immersed in Ringer's solution open to air at 37°C. The processes that govern the electrochemical reactions at the film surface were analyzed using a combination of complementary electrochemical measurement techniques such as potentiodynamic polarization, electrochemical impedance spectroscopy and Mott-Schottky analysis. The results show that the (Ti1-xNbx)5Si3 nanocrystalline films offer Ti-6Al-4V a strong shield from corrosive attack and the addition of Nb in the films greatly enhances their resistance to corrosion, and in so doing, minimizes metal ion release. Collectively, our data suggest that (Ti1-xNbx)5Si3 nanocrystalline films as supreme coatings with anti-corrosive properties have potential to improve the performance and extend the service life of orthopedic and cochlear implants.
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Xie F, He X, Cao S, Mei M, Qu X. Influence of pore characteristics on microstructure, mechanical properties and corrosion resistance of selective laser sintered porous Ti–Mo alloys for biomedical applications. Electrochim Acta 2013. [DOI: 10.1016/j.electacta.2013.04.105] [Citation(s) in RCA: 71] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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14
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Kumar S, Narayanan TS. Corrosion behaviour of Ti–15Mo alloy for dental implant applications. J Dent 2008; 36:500-7. [DOI: 10.1016/j.jdent.2008.03.007] [Citation(s) in RCA: 86] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/07/2007] [Revised: 03/07/2008] [Accepted: 03/25/2008] [Indexed: 11/16/2022] Open
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15
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Boehlert C, Cowen C, Quast J, Akahori T, Niinomi M. Fatigue and wear evaluation of Ti-Al-Nb alloys for biomedical applications. MATERIALS SCIENCE & ENGINEERING. C, MATERIALS FOR BIOLOGICAL APPLICATIONS 2008. [DOI: 10.1016/j.msec.2007.04.003] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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16
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Nag S, Banerjee R, Stechschulte J, Fraser HL. Comparison of microstructural evolution in Ti-Mo-Zr-Fe and Ti-15Mo biocompatible alloys. JOURNAL OF MATERIALS SCIENCE. MATERIALS IN MEDICINE 2005; 16:679-85. [PMID: 15965601 DOI: 10.1007/s10856-005-2540-6] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/25/2003] [Accepted: 08/13/2004] [Indexed: 05/03/2023]
Abstract
The microstructural evolution and attendant strengthening mechanisms in two biocompatible alloy systems, the binary Ti-15Mo and the quaternary Ti-13Mo-7Zr-3Fe (TMZF), have been compared and contrasted in this paper. In the homogenized condition, while the Ti-15Mo alloy exhibited a single phase microstructure consisting of large beta grains, the TMZF alloy exhibited a microstructure consisting primarily of a beta matrix with grain boundary alpha precipitates and a low volume fraction of intra-granular alpha precipitates. On ageing the homogenized alloys at 600 degrees C for 4 h, both alloys exhibited the precipitation of refined scale secondary alpha precipitates homogeneously in the beta matrix. However, while the hardness of the TMZF alloy marginally increased, that of the Ti-15Mo alloy decreased substantially as a result of the ageing treatment. In order to understand this difference in the mechanical properties after ageing, TEM studies have been carried out on both alloys in the homogenized and homogenized plus aged conditions. The results indicate that the omega precipitates dissolve on ageing in case of the Ti-15Mo alloy, consequently leading to a substantial decrease in the hardness. In contrast, the omega precipitates do not dissolve on ageing in the TMZF alloy and the precipitation of the fine scale secondary alpha leads to increased hardness.
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Affiliation(s)
- S Nag
- Center for the Accelerated Maturation of Materials, Department of Materials Science and Engineering, The Ohio State University, Columbus, Ohio, USA
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Nag S, Banerjee R, Fraser H. Microstructural evolution and strengthening mechanisms in Ti–Nb–Zr–Ta, Ti–Mo–Zr–Fe and Ti–15Mo biocompatible alloys. MATERIALS SCIENCE & ENGINEERING. C, MATERIALS FOR BIOLOGICAL APPLICATIONS 2005. [DOI: 10.1016/j.msec.2004.12.013] [Citation(s) in RCA: 132] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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18
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Banerjee R, Nag S, Stechschulte J, Fraser HL. Strengthening mechanisms in Ti–Nb–Zr–Ta and Ti–Mo–Zr–Fe orthopaedic alloys. Biomaterials 2004; 25:3413-9. [PMID: 15020114 DOI: 10.1016/j.biomaterials.2003.10.041] [Citation(s) in RCA: 169] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/22/2003] [Accepted: 10/11/2003] [Indexed: 11/21/2022]
Abstract
The microstructural evolution and attendant strengthening mechanisms in two novel orthopaedic alloy systems, Ti-Nb-Zr-Ta and Ti-Mo-Zr-Fe, have been compared and contrasted in this paper. Specifically, the alloy compositions considered are Ti-34Nb-9Zr-8Ta and Ti-13Mo-7Zr-3Fe. In the homogenized condition, both alloys exhibited a microstructure consisting primarily of a beta matrix with grain boundary alpha precipitates and a low-volume fraction of intra-granular alpha precipitates. On ageing the homogenized alloys at 600 degrees C for 4 hr, both alloys exhibited the precipitation of refined scale secondary alpha precipitates homogeneously in the beta matrix. However, while the hardness of the Ti-Mo-Zr-Fe alloy marginally increased, that of the Ti-Nb-Zr-Ta alloy decreased substantially as a result of the ageing treatment. In order to understand this difference in the mechanical properties after ageing, TEM studies have been carried out on both alloys prior to and post the ageing treatment. The results indicate the existence of a metastable B2 ordering in the Ti-Nb-Zr-Ta alloy in the homogenized condition which is destroyed by the ageing treatment, consequently leading to a decrease in the hardness.
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Affiliation(s)
- Rajarshi Banerjee
- Department of Materials Science and Engineering, The Ohio State University, 477 Watts Hall, 2041 College Road, Columbus, OH 43210, USA.
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Osano E, Kishi J, Takahashi Y. Phagocytosis of titanium particles and necrosis in TNF-alpha-resistant mouse sarcoma L929 cells. Toxicol In Vitro 2003; 17:41-7. [PMID: 12537961 DOI: 10.1016/s0887-2333(02)00127-3] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Abstract
In the oral cavity, titanium is an excellent biocompatible material. However, it is reported that high ratios of intracellular titanium particles can cause cell apoptosis or necrosis by as-yet unknown mechanisms. The purpose of this study was to investigate the response of tumor necrosis factor alpha (TNF-alpha)-resistant L929 fibroblasts to titanium particles. Cells were cultured in Eagle's medium supplemented with fetal bovine serum and L-glutamine. Titanium particle sizes were less than 9 micro. Cytotoxicity was assayed by a cell counting kit, trypan blue dye exclusion test and lactate dehydrogenase (LDH) leakage. The production of reactive oxygen species (ROS) was detected by a confocal laser scanning microscope (CLSM) using dichlorofluorescein diacetate as a fluorescent probe. Morphology was viewed by a CLSM and with an X-ray microanalyser (XMA). When titanium particles were added to cells, the viability decreased to around 50% at a particle concentration of 2.0%. The number of dead cells and LDH activity in the culture media increased significantly between 1 and 2 days. However, formation of active oxygen species did not occur, since no dichlorofluorescein fluorescence was observed. A scanning electron photomicrograph (SEM) revealed a large number of particles covering or adhering to cellular components in lysed cells compared with flattened control cells attached to the substrate. The XMA showed that the titanium accumulation was coincident with the deformed cell shape. The CLSM also confirmed that particles were within the cells. From these results it was concluded that titanium particles ingested in large quantities into the cell induced necrosis by a pathway other than by producing ROS.
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Affiliation(s)
- E Osano
- Department of Microbiology, School of Dentistry, Aichi-Gakuin University, 1-100 Kusumoto-cho, Chikusa-ku, Nagoya 464-8650, Japan
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Abstract
Structure and properties of a series of binary Ti-Mo alloys with molybdenum contents ranging from 6 to 20 wt% have been investigated. Experimental results indicated that crystal structure and morphology of the cast alloys were sensitive to their molybdenum contents. The hexagonal alpha' phase c.p. Ti exhibited a feather-like morphology. When Mo content was 6 wt%, a fine, acicular martensitic structure of orthorhombic alpha" phase was observed. When Mo content was 7.5 wt%, the entire alloy was dominated by the martensitic alpha" structure. When Mo content was increased to 10 wt% or higher, the retained beta phase became the only dominant phase. Among all Ti-Mo alloys, the alpha" phase Ti-7.5Mo alloy had the lowest hardness. The bending strength of Ti-7.5Mo was similar to that of Ti-15Mo and Ti-13Nb-13Zr, and higher than c.p. Ti by nearly 60%. The bending modulus of the alpha"-dominated Ti-7.5Mo alloy was lower than that of Ti-15Mo by 22%, of Ti-6A1-4V by 47%, of Ti-13Nb-13Zr by 17%, and of c.p. Ti by 40%.
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Affiliation(s)
- W F Ho
- Department of Materials Science and Engineering, National Cheng-Kung University, Tainan, Taiwan, ROC
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21
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Okazaki Y, Kyo K, Ito Y, Tateishi T. Effects of Mo and Pd on Corrosion Resistance of V-Free Titanium Alloys for Medical Implants. ACTA ACUST UNITED AC 1997. [DOI: 10.2320/matertrans1989.38.344] [Citation(s) in RCA: 24] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
Affiliation(s)
- Yoshimitsu Okazaki
- Mechanical Engineering Laboratory, Agency of Industrial Science and Technology, Ministry of International Trade and Industry
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