Titanium Metal Plate Research Articles

Effect of Argon-Based Atmospheric Pressure Plasma Treatment on Hard Tissue Formation on Titanium Surface.

In this paper, we suggest that the atmospheric pressure plasma treatment of pure titanium metal may be useful for improving the ability of rat bone marrow cells (RBMCs) to induce hard tissue differentiation. Previous studies have reported that the use of argon gas induces a higher degree of hard tissue formation. Therefore, this study compares the effects of plasma treatment with argon gas on the initial adhesion ability and hard tissue differentiation-inducing ability of RBMCs. A commercially available titanium metal plate was used as the experimental material. A plate polished using water-resistant abrasive paper #1500 was used as the control, and a plate irradiated with argon mixed with atmospheric pressure plasma was used as the experimental plate. No structural change was observed on the surface of the titanium metal plate in the scanning electron microscopy results, and no change in the surface roughness was observed via scanning probe microscopy. X-ray photoelectron spectroscopy showed a decrease in the carbon peak and the formation of hydroxide in the experimental group. In the distilled water drop test, a significant decrease in the contact angle was observed for the experimental group, and the results indicated superhydrophilicity. Furthermore, the bovine serum albumin adsorption, initial adhesion of RBMCs, alkaline phosphatase activity, calcium deposition, and genetic marker expression of rat bone marrow cells were higher in the experimental group than those in the control group at all time points. Rat distal femur model are used as in vivo model. Additionally, microcomputed tomography analysis showed significantly higher results for the experimental group, indicating a large amount of the formed hard tissue. Histopathological evaluation also confirmed the presence of a prominent newly formed bone seen in the images of the experimental group. These results indicate that the atmospheric pressure plasma treatment with argon gas imparts superhydrophilicity, without changing the properties of the pure titanium plate surface. It was also clarified that it affects the initial adhesion of bone marrow cells and the induction of hard tissue differentiation.

Fabrication and Electrochemical Properties of Highly Ordered Titania Nanotubes Modified with Boron Nanocrystalline Diamond

Recently, we reported on the phenomena of the formation of the novel composite material based on titania nanotubes (TiO2 NTs) over-grown by thin boron-doped diamond (BDD) produced in microwave plasma enhanced chemical vapor deposition (MW PE CVD) [1,2]. Under microwave plasma treatment, the structure TiO2 NTs underwent transformation from stoichiometric anatase into non-stochiometric oxide with Ti(III) phase and some rutile phase arises. Furthermore, obtained material was characterized with a significantly enhanced conductivity and capacitance comparing to pristine titania. The electrochemical studies showed that the specific areal capacitance of TiO2/BDD raised up to 7.46 mF cm-2 whereas for the pure BDD it reached only 0.11 7.46 mF cm-2. Because of such strong modification of titania and application potential in energy storage devices we decided to initiate growth of boron nanocrystalline diamond (B-NDC) on the highly ordered TiO2 nanotube arrays. TiO2 NTs are fabricated via two-step anodization of titanium metal plate followed by a short immersion in diluted HF in order to remove any surface debris [3]. Titanium plate covered by uniform titania nanotube layer provides a large specific surface area as well as a direct pathway for charge transport, thus holding promising capabilities of being support for another materials deposition. Afterwards, similarly to formation of TiO2NTs/BDD material, the deposition of boron nanocrystalline diamond will be also realized under microwave plasma conditions and Ti/TiO2 NTs will act as a substrate. The morphology and the structure of obtained composite material will be investigated using scanning electron microscopy and Raman spectroscopy. Electrochemical activity will be identified applying cyclic voltammetry and electrochemical impedance spectroscopy techniques performed in aqueous electrolyte. The influence of boron-doping level will be observed as a change in registered capacitive current and impedance behaviour.

Semi-transparent ordered TiO2 nanostructures prepared by anodization of titanium thin films deposited onto the FTO substrate

In a significant amount of cases, the highly ordered TiO2 nanotube arrays grow through anodic oxidation of a titanium metal plate immersed in electrolyte containing fluoride ions. However, for some practical applications, e.g. solar cells or electrochromic windows, the semi-transparent TiO2 formed directly on the transparent, conductive substrate is very much desired. This work shows that high-quality Ti coating could be formed at room temperature using an industrial magnetron sputtering system within 50min. Under optimized conditions, the anodization process was performed on 2μm titanium films deposited onto the FTO (fluorine-tin-oxide) support. Depending on the electrolyte type, highly ordered tubular or porous titania layers were obtained. The fabricated samples, after their thermal annealing, were investigated using scanning electron microscopy, Raman spectroscopy and UV–vis spectroscopy in order to investigate their morphology, crystallinity and absorbance ability. The photocurrent response curves indicate that materials are resistant to the photocorrosion process and their activity is strongly connected to optical properties. The most transparent TiO2 films were fabricated when Ti was anodized in water electrolyte, whereas the highest photocurrent densities (12μAcm−2) were registered for titania received after Ti anodization in ethylene glycol solution. The obtained results are of significant importance in the production of thin, semi-transparent titania nanostructures on a commercial scale.

Comparison of Material-Related Complications After Bilateral Sagittal Split Mandibular Setback Surgery: Biodegradable Versus Titanium Miniplates

The aim of the present prospective study was to compare material-related complications using biodegradable and titanium miniplates after bilateral sagittal split mandibular setback surgery. The subjects included 200 Japanese adults (67 men and 133 women, age range 18 to 45 years) with jaw deformities diagnosed as mandibular prognathism. All patients were prospectively and consecutively randomized to 2 study groups, receiving biodegradable or titanium fixation plates. Of the 200 patients, 110 underwent bilateral sagittal split ramus osteotomy with a biodegradable fixation plate and 90 underwent bilateral sagittal split ramus osteotomy with a titanium metal plate. The clinical records and radiologic findings of the patients were reviewed, and the incidence of material-related complications was compared. The incidence of postoperative complications and breakage in the biodegradable group was 8.2% (9 cases) and in the titanium group was 3.3% (3 cases). No statistically significant difference in the incidence of complications was found between the 2 groups. Fractures of the biodegradable plate occurred at a significantly greater frequency in patients with asymmetry than in patients without asymmetry. Biodegradable plates were reliable with minimal material-related complications. However, the use of biodegradable plates should be recommended for minimally loaded situations.

Apatite-forming ability of titanium compound nanotube thin films formed on a titanium metal plate in a simulated body fluid

We compared the apatite-forming ability of a sodium titanate nanotube thin film, an anatase-type titanium dioxide nanotube thin film, and a silver nanoparticle/silver titanate nanotube nanocomposite thin film, in simulated body fluid. The ability of the silver nanoparticle/silver titanate nanotube nanocomposite thin film is slightly higher than that of the anatase-type titanium dioxide nanotube thin film and significantly higher than that of the sodium titanate nanotube thin film. The high ability of the silver nanoparticle/silver titanate nanotube nanocomposite thin film is a newly observed phenomenon, which is probably due to the crystal structure of silver titanate – specifically, to the surface atomic arrangement, the large amount of Ti–OH formed on the nanotube surface, or both. The anatase-type titanium dioxide nanotube thin film and the silver nanoparticle/silver titanate nanotube nanocomposite thin film may have bright prospects for future use in implant materials such as artificial joints. The silver nanoparticle/silver titanate nanotube nanocomposite thin film is particularly promising for its antibacterial properties.

TiO 2 nanotube, nanowire, and rhomboid-shaped particle thin films fixed on a titanium metal plate

Titanium dioxide thin films having various nanostructures could be formed by various treatments on sodium titanate nanotube thin films approximately 5 μm thick fixed on titanium metal plates. Using an aqueous solution with a lower hydrochloric acid concentration (0.01 mol/L) and a higher reaction temperature (90 °C) than those previously employed, we obtained a hydrogen titanate nanotube thin film fixed onto a titanium metal plate by H + ion-exchange treatment of the sodium titanate nanotube thin film. Calcination of hydrogen titanate nanotube thin films yielded porous thin films consisting of anatase nanotubes, anatase nanowires, and anatase nanoparticles grown directly from the titanium metal plate. H + ion-exchange treatment of sodium titanate nanotube thin films at 140 °C resulted in porous thin films consisting of rhomboid-shaped anatase nanoparticles.

Formation of Sodium Titanate Nanotube Films by Hydrothermal Transcription

A titanium metal plate and a substrate were placed adjacently and treated hydrothermally at 160 °C in NaOH aqueous solution. A sodium titanate nanotube film reflecting the form of the titanium plate and the composition of the substrate was formed on substrates such as Co−Cr alloy and SUS316L.

Randomized prospective study of ACL reconstruction with interference screw fixation in patellar tendon autografts versus femoral metal plate suspension and tibial post fixation in hamstring tendon autografts: 5-year clinical and radiological follow-up results

Patellar tendon graft has been the most frequently used material in anterior cruciate ligament (ACL) reconstruction, but the hamstring tendons have been increasingly used as well; however, which graft is to be preferred is not adequately supported by existing clinical studies. In this prospective randomized clinical trial, the study hypothesis was that the hamstring tendons are equally good graft material as the patellar tendon in ACL reconstruction. Ninety-nine patients with laxity due to a torn ACL underwent arthroscopically assisted reconstruction with graft randomization according to their birth year to either patellar tendon with metal interference screw fixation or double looped semitendinosus and gracilis tendons with fixation similar to the Endobutton technique using a titanium metal plate suspension proximally and screw-washer postdistally. Excluding preoperative Lysholm knee score, there were no significant differences between the two groups in the preoperative and operative data. A standard rehabilitation regimen was used for all the patients, including immediate postoperative mobilization without a knee brace, protected weight bearing for 2 weeks, and return to full activity at 6-12 months postoperatively. Forty patients in the patellar tendon group and 39 patients in the hamstring tendon group were available for clinical evaluation at median 5 years after surgery (ranges 3 years 11 months-6 years 7 months). The results revealed no statistically significant differences with respect to clinical and instrumented laxity testing, isokinetic muscle torque measurements, International Knee Documentation Committee ratings, Lysholm (knee score), Tegner (activity level) and Kujala patellofemoral knee scores. There was an enlargement of the drill tunnels, statistically more in the hamstring tendon group, but no increase from 2 to 5 years in either group. Narrowing of the joint spaces (IKDC measurement method) from 2 to 5 years postoperatively was seen in both the groups, however, without difference between the two groups.

獲得性第ＶＩＩＩ因子抗体を有する患者に発症した放射線性下顎骨骨髄炎の治療経験

A case of radiation osteomyelitis of mandible in a 56-year-old man with acquired factor VIII inhibitor is presented. He had undergone radiation therapy for malignant lymphoma of the tonsilar region seven years earlier, and also had received steroids to treat acquired factor VIII inhibitor for a year. On initial examination, he was given a diagnosis of phlegmon of the cheek caused by pericoronitis of the left lower wisdom tooth. To prevent the recurrence of inflammation, the wisdom tooth was extracted carefully, but radiation osteomyelitis occurred in association with a pathological fracture of the condylar head. After mini-pulse therapy with methylpredonisolone, segmental mandibulectomy and reconstruction with a titanium metal plate were performed. The postoperative course was satisfactory with no complications such as bleeding or infection.

Thermoanalytical investigation on the formation of IrO2-based mixed oxide coatings

The formation reactions of IrO2/TiO2 mixed oxide films supported on titanium metal plate were followed by thermoanalytical (simultaneous TGA, DTG, DTA) and combined thermoanalyticalmass spectrometric (TGA-MS) techniques. The electrochemical characterization of the fired coatings was made by cyclic voltammetry. The thermal decomposition of the titanium precursor salt, titanium diisopropoxide bis-2,4-pentanedionate, shows a major change in the presence of hydrated iridium (iii) chloride. Due to the catalytic effect of the added noble metal, an almost complete conversion of the organic components of the precursor mixture to CO2 and H2O is observed in the combustion stage. Chlorine, from thermal decomposition of the iridium salt, is produced in a separate stage at higher temperatures, indicating that a sequence of steps occurs prior to the oxide formation. For iridium chloride alone a complexation between the metal ion and the solvent (isopropanol) is observed, leading eventually to H2O and CO2 production (combustion step) between 300 and 500° C. The cyclic voltammetry results indicate that the features of the precursor reaction affect the charge storage capacity of the oxide films.

気相メッキ炭化チタン被覆材の高温耐食性

Corrosion resistivity of titanium carbide coated on iron in various corrosive gases was examined with a thermobalance at a constant rate of temperature elevation of 3°C/min.For hydrogen chloride, the decrease in weight was not observed up to 1, 000°C. For chlorine, a sudden decrease in weight was found in a range of 460-500°C, which would be due to the rupture of surface oxide film followed by chlorination of titanium carbide and the substrate alloys. For hydrogen sulfide, striped protrusions were observed on some parts of the surface, which were considered to be iron sulfide; however., no change was seen in most parts of the surface up to 1, 000°C. For sulfur dioxide, rutile type oxide was found above 700°C. For oxygen, a linear relation was obtained above 650°C between the weight decrease and time, and the activation energy was found to be 26kcal/mol, which nearly agreed with that in the initial oxidation stage of titanium metal plate.