Super Elastic Functional β Titanium Alloy with Low Young's Modulus for Biomedical Applications

Niinomi, Mitsuo; Akahori, Toshikazu; Hattori, Yoshitaka; Morikaw, K; Kasuga, Toshihiro; Fukui, Hisao; Suzuki, Akihiro; Kyo, Kenji; Niwa, S

doi:10.1520/jai12818

Cited by 9 publications

(7 citation statements)

References 5 publications

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“…TiO 2 layers prepared by electrochemical oxidation have attracted increasing interest in recent years because of their excellent performances in various applications such as photocatalysts, solar cells, gas sensors, and biomedical applications. Extensive studies are still conducted to develop new titanium alloys of improved strength and free of any toxic alloying element, which are intended for medical applications. , Zr, Nb, and Ta are selected as alloying elements for Ti-based alloys, and the results regarding the corrosion resistance and biocompatibility are presented. , …”

Section: Introductionmentioning

confidence: 99%

“…Therefore, Zr as alloying element for Ti could considerably improve the corrosion resistance since the obtained ZrO 2 strengthens the TiO 2 passive film formed on Ti alloy . Many research studies are conducted toward the development of Ti–Zr-based alloys (binary or ternary) with different Zr contents (25–50 wt %), having low Young’s modulus and high strength for temporary orthopedic implants. ,− Porous structures have been proposed to decrease the elastic modulus of titanium-based alloys close to those from bones. − A material with a porous structure can also reduce stiffness …”

Section: Introductionmentioning

confidence: 99%

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Anticorrosion Performance of the Electrochemically Grown Mixed Porous Oxide Films on Titanium Alloy in Biological Solution

Benea

Ravoiu

Célis

2019

ACS Biomater. Sci. Eng.

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A thin porous mixed layer of TiO2–ZrO2 was grown on titanium–zirconium alloy surface by electrochemical oxidation. Further comparison of the corrosion behavior in Fusayama–Meyer biological solution was performed. Scanning electron microscopy surface morphology investigations confirm the presence of porous oxide film, while energy-dispersive X-ray spectroscopy analyses provide a high amount of oxygen element in the porous film and a higher amount of Zr element, concluding the mixed nature of oxide film formed, TiO2–ZrO2. For corrosion investigations, electrochemical techniques such as open-circuit potential, electrochemical impedance spectroscopy, and potentiodynamic polarization were applied. The corrosion investigations reveal better behavior of the thin porous mixed oxide layer on titanium alloy compared to the untreated alloy having on their surface the native oxide formed in contact with the air, confirming the possibility to improve the properties of such implant application in saliva solution.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Anticorrosion Performance of the Electrochemically Grown Mixed Porous Oxide Films on Titanium Alloy in Biological Solution

Benea

Ravoiu

Célis

2019

ACS Biomater. Sci. Eng.

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“…However, the possibility that TNTZ coating on Ti-6Al-4V hip prostheses can improve the latter's performance should be considered a promising one. According to reports in the literature [23][24][25] , new β-type TNTZ alloys present mechanical and biochemical properties that render them suitable for application as prosthetic coatings or in the prosthetic stem itself. Of course, accreditation by a competent agency is required and certification may take some time.…”

Section: Resultsmentioning

confidence: 99%

Numerical evaluation of reduction of stress shielding in laser coated hip prostheses

Antonialli

Bolfarini

2011

Mat. Res.

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The increasing use of titanium alloys as biomaterials can be attributed, among other factors, to their low Young modulus compared to other alloys with similar mechanical strength. However, Ti-6Al-4V alloy, the alloy most widely used in implants, has a stiffness of about 110 GPa, which is much higher than the typical stiffness of 20 GPa of human bone. In the specific case of hip arthroplasty, this difference in stiffness reduces the load imposed on the femur through the stress shielding phenomenon, which, in the medium term, usually results in the loss of bone density. One way to reduce this phenomenon is by using TiNbTaZr (TNTZ) alloys, which have a stiffness of about 47 GPa. This work uses numerical simulation to evaluate the effectiveness of TNTZ laser coated on a Ti-6Al-4V hip prosthesis in reducing stress shielding. The results show that this may improve the performance of the prosthesis, extending its service life.

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“…Everything discussed above leads to a new titanium (Ti) alloys focus on a crystalline structure of the body-centered cubic phase (BCC, Body-Centered Cubic), that is, β-phase alloys, and using highly compatible alloys [3]. Niobium (Nb) not only stabilizes the β phase, but also presents substantial biocompatibility.…”

Section: Introductionmentioning

confidence: 99%

Laser Surface Modification in Ti-xNb-yMo Alloys Prepared by Powder Metallurgy

Tendero

Rossi

Viera

et al. 2021

Metals

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The main objective was to study the effect of surface modification by laser on Ti-Nb-Mo powder metallurgical alloys to improve their mechano-chemical behavior and their application as a biomedical implant. The used powder mixtures were produced in an inert atmosphere. Uniaxial compaction took place at 600 MPa with high-vacuum sintering at 1250 °C for 3 h. The specimens for the three-point flexure test were prepared and their mechanical properties determined. Microstructural characterization was performed by scanning electron microscopy (SEM) and X-ray diffraction (XRD) to obtain the distribution of phases, porosity, size, and shape of the grains of each alloy. Corrosion behavior was evaluated by electrochemical tests using an artificial saliva electrolyte modified from Fusayama at 37 °C. Chemical characterization was completed by analyzing the ionic release by Inductively coupled plasma atomic emission spectroscopy (ICP-EOS) after immersion for 730 h in Fusayama solution modified with NaF at 37 °C to simulate a 20-year life span based on a daily 2-min cycle of three toothbrushes. Corrosion behavior confirmed promising possibilities for the biomedicine field. The surface porosity of the samples not submitted to surface treatment deteriorated properties against corrosion and ion release. The obtained phase was β, with a low α”-martensite percentage. The maximum resistance to bending was greater after surface fusion. Plastic deformations were above 7% under some conditions. Microhardness came close to 300 HV in heat-affected zone (HAZ) and 350 HV in fusion zone (FZ) (under the determined condition. The elastic modulus lowered by around 10%. The corrosion rate was lower in Ti-27Nb-8Mo and Ti-35Nb-6Mo. Niobium release was significant, but below the physiological limit.

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Super Elastic Functional β Titanium Alloy with Low Young's Modulus for Biomedical Applications

Cited by 9 publications

References 5 publications

Anticorrosion Performance of the Electrochemically Grown Mixed Porous Oxide Films on Titanium Alloy in Biological Solution

Anticorrosion Performance of the Electrochemically Grown Mixed Porous Oxide Films on Titanium Alloy in Biological Solution

Numerical evaluation of reduction of stress shielding in laser coated hip prostheses

Laser Surface Modification in Ti-xNb-yMo Alloys Prepared by Powder Metallurgy

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