Hisashi Doi
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View article: Investigation of antibacterial effect of copper introduced titanium surface by electrochemical treatment against facultative anaerobic bacteria
Investigation of antibacterial effect of copper introduced titanium surface by electrochemical treatment against facultative anaerobic bacteria Open
This study investigated the efficacy of copper (Cu) as an antibacterial element incorporated on titanium (Ti) surface by electrochemical treatment. Cu was incorporated onto Ti surface by micro-arc oxidation (MAO). A small amount of Cu was …
View article: On the mechanical biocompatibility of Ti-15Zr-based alloys for potential use as load-bearing implants
On the mechanical biocompatibility of Ti-15Zr-based alloys for potential use as load-bearing implants Open
Made available in DSpace on 2020-12-12T02:31:26Z (GMT). No. of bitstreams: 0\n Previous issue date: 2020-03-01
View article: Chemical and Biological Roles of Zinc in a Porous Titanium Dioxide Layer Formed by Micro-Arc Oxidation
Chemical and Biological Roles of Zinc in a Porous Titanium Dioxide Layer Formed by Micro-Arc Oxidation Open
This study investigated the time transient effect of zinc (Zn) in the porous titanium dioxide formed by micro-arc oxidation (MAO) treatment routinely performed for Zn-containing electrolytes. The aim of our analysis was to understand the c…
View article: Three-dimensional quantification of magnetic resonance imaging artifacts associated with shape factors
Three-dimensional quantification of magnetic resonance imaging artifacts associated with shape factors Open
Differences in the volumes of artifacts caused by variously shaped titanium objects on magnetic resonance imaging (MRI) were evaluated. Spherical-, square cubic-, and regular tetrahedron-shaped isotropic, and elongated spherical-, elongate…
View article: Surface characterization of commercially available yttria-stabilized tetragonal zirconia polycrystalline in water and Hanks’ solution using X-ray photoelectron spectroscopy
Surface characterization of commercially available yttria-stabilized tetragonal zirconia polycrystalline in water and Hanks’ solution using X-ray photoelectron spectroscopy Open
To elucidate the mechanism of adhesion of soft and hard tissues to yttria-stabilized tetragonal zirconia polycrystalline (Y-TZP), Y-TZP and titanium disks were immersed in ultrapure water and in Hanks' solution, and the changes in the surf…
View article: Cover Image, Volume 62, Issue 2
Cover Image, Volume 62, Issue 2 Open
The cover image, by Miki Goto et al., is based on the Research Article Synthesis of 11C-labeled ubiquinone and ubiquinol via Pd0-mediated rapid C-[11C]methylation using [11C]methyl iodide and 39-demethyl-39-(pinacolboryl)ubiquinone, https:…
View article: Effects of Cold Swaging on Mechanical Properties and Magnetic Susceptibility of the Zr–1Mo Alloy
Effects of Cold Swaging on Mechanical Properties and Magnetic Susceptibility of the Zr–1Mo Alloy Open
Zr alloy is expected to decrease the artifact volume of magnetic resonance imaging (MRI) due to its relatively small magnetic susceptibility. To improve the mechanical properties of a Zr–1mass%Mo alloy that yielded a reduced artifact volum…
View article: Evaluation of selected mechanical properties of NiTi rotary glide path files manufactured from controlled memory wires
Evaluation of selected mechanical properties of NiTi rotary glide path files manufactured from controlled memory wires Open
This study aimed to investigate mechanical properties related to flexibility and fracture resistance of controlled memory wiremanufactured nickel-titanium rotary glide path files [HyFlex EDM Glide Path File (EDM) and HyFlex GPF (GPF)]. Sco…
View article: Fabrication and Characterization of a Low Magnetic Zr-1Mo Alloy by Powder Bed Fusion Using a Fiber Laser
Fabrication and Characterization of a Low Magnetic Zr-1Mo Alloy by Powder Bed Fusion Using a Fiber Laser Open
A low magnetic Zr-1Mo alloy was fabricated by a powder bed fusion (PBF) process using a fiber laser. The microstructure, surface morphology, and pore distribution of the as-built Zr-1Mo alloy were observed. Its magnetic susceptibility and …
View article: Inhibitory Effect of Zirconium Coating to Bone Bonding of Titanium Implants in Rat Femur
Inhibitory Effect of Zirconium Coating to Bone Bonding of Titanium Implants in Rat Femur Open
When titanium (Ti) alloys are used for bone fixators after bone fracture, Ti alloys form new bone around themselves in human bone. This ability can cause re-fracture when the fixators are retrieved after bone healing. Surface treatments th…
View article: Electrochemical Surface Treatment of a β-titanium Alloy to Realize an Antibacterial Property and Bioactivity
Electrochemical Surface Treatment of a β-titanium Alloy to Realize an Antibacterial Property and Bioactivity Open
In this study, micro-arc oxidation (MAO) was performed on a β-type titanium alloy, namely, Ti-29Nb-13Ta-4.6Zr alloy (TNTZ), to improve not only its antibacterial property but also bioactivity in body fluids. The surface oxide layer formed …
View article: Different mechanisms of bone formation of preosteoblast on metals in vitro
Different mechanisms of bone formation of preosteoblast on metals in vitro Open
Event Abstract Back to Event Different mechanisms of bone formation of preosteoblast on metals in vitro Peng Chen1, Yusuke Tsutsumi1, Maki Ashida1, Hisashi Doi1 and Takao Hanawa1 1 Tokyo Medical and Dental University, Institute of Biomater…
View article: Effect of Heat Treatment and the Fabrication Process on Mechanical Properties of Zr-14Nb Alloy
Effect of Heat Treatment and the Fabrication Process on Mechanical Properties of Zr-14Nb Alloy Open
The microstructure and mechanical properties of thermomechanically processed Zr-14Nb alloy with low magnetic susceptibility were investigated in this study. The stress-strain curves of Zr-14Nb alloy were classified as higher or lower work-…
View article: Cytocompatibility of Ti–6Al–7Nb through High-Pressure Torsion Processing
Cytocompatibility of Ti–6Al–7Nb through High-Pressure Torsion Processing Open
In this study, we evaluated the cytocompatibility of high-pressure torsion (HPT)-processed Ti-6Al-7Nb alloys. Grain size of titanium (Ti) alloys decreased from 5 µm (without HPT processing, HPT-0) to ~100 nm (at 2 GPa, HPT-2) or ~70 nm (at…
View article: Surface Composition and Corrosion Resistance of Co-Cr Alloys Containing High Chromium
Surface Composition and Corrosion Resistance of Co-Cr Alloys Containing High Chromium Open
Air-formed surface oxide films on four types of Co-Cr- alloys were characterized using X-ray photoelectron spectroscopy (XPS) and five types of Co-Cr alloys were anodically polarized, to identify the effects of the addition of N, Mo, and W…
View article: The corrosion resistance of Ti-Zr binary alloy with compositional change
The corrosion resistance of Ti-Zr binary alloy with compositional change Open
Event Abstract Back to Event The corrosion resistance of Ti-Zr binary alloy with compositional change Teisuke Akimoto1, Takeshi Ueno1, Yuusuke Tsutsumi2, Hisashi Doi2, Takao Hanawa2 and Noriyuki Wakabayashi1 1 Tokyo Medical and Dental Univ…
View article: Anti-bacterial surface coating on metallic biomaterials by simple electrochemical surface treatment
Anti-bacterial surface coating on metallic biomaterials by simple electrochemical surface treatment Open
Event Abstract Back to Event Anti-bacterial surface coating on metallic biomaterials by simple electrochemical surface treatment Yusuke Tsutsumi1, Masaya Shimabukuro2, Maki Ashida1, Peng Chen1, Hisashi Doi1 and Takao Hanawa1 1 Tokyo Medica…
View article: Evaluation of Release and Accumulation of Metal Ions from Titanium and Nickel by Accelerated Dissolution Test in Simulated Body Environments
Evaluation of Release and Accumulation of Metal Ions from Titanium and Nickel by Accelerated Dissolution Test in Simulated Body Environments Open
To study the allergenic properties of titanium (Ti), the corrosion behaviors and following metal ions release of Ti and nickel (Ni) in simulated physiological environments were investigated. Anodic polarization tests and accelerated dissol…
View article: Mechanical properties of orthodontic wires made of super engineering plastic
Mechanical properties of orthodontic wires made of super engineering plastic Open
Most orthodontic equipment is fabricated from alloys such as stainless steel, Co-Cr and Ni-Ti because of their excellent elastic properties. In recent years, increasing esthetic demands, metal allergy and interference of metals with magnet…
View article: Additional file 1: Figure S1. of A novel 11C-labeled thymidine analog, [11C]AZT, for tumor imaging by positron emission tomography
Additional file 1: Figure S1. of A novel 11C-labeled thymidine analog, [11C]AZT, for tumor imaging by positron emission tomography Open
PET images of C6 and HeLa tumor-bearing mice between 30 and 60 min after injection of 50 MBq of [11C]AZT (A) and [11C]d4T (B). Arrows and arrowheads indicate the C6 and HeLa tumors, respectively. Figure S2 [11C]AZT and [18F]FDG uptake in a…
View article: VULNERABILITY FUNCTIONS IN TERMS OF GROUND MOTION CHARACTERISTICS FOR WOODEN HOUSES EVALUATED BY USE OF EARTHQUAKE INSURANCE EXPERIENCE
VULNERABILITY FUNCTIONS IN TERMS OF GROUND MOTION CHARACTERISTICS FOR WOODEN HOUSES EVALUATED BY USE OF EARTHQUAKE INSURANCE EXPERIENCE Open
Based on an earthquake insurance experience, the relationship between seismic ground motion intensity and the damage ratio of wooden houses is examined. In addition, vulnerability functions are evaluated from numerical simulations, in whic…
View article: Microstructure and Mechanical Properties of Large-Scale Ingots of the Zr-1Mo Alloy
Microstructure and Mechanical Properties of Large-Scale Ingots of the Zr-1Mo Alloy Open
A large-scale ingot of Zr-1Mo alloy was produced for industrial manufacturing to investigate whether it is possible to produce an ingot with homogeneity. The homogeneous ingot with a chemical composition of Zr-1 mass%Mo was prepared succes…
View article: Calcification of MC3T3-E1 cells on titanium and zirconium
Calcification of MC3T3-E1 cells on titanium and zirconium Open
To confirm similarity of hard tissue compatibility between titanium and zirconium, calcification of MC3T3-E1 cells on titanium and zirconium was evaluated in this study. Mirror-polished titanium (Ti) and zirconium (Zr) disks and zirconium-…