[in Japanese]

View full abstract

[in Japanese]

View full abstract

[in Japanese]

View full abstract

[in Japanese]

View full abstract

[in Japanese]

View full abstract

The glass flake powder was applied as the glass filler of dental composite resin(CR). The obtained CR showed good translucency and flowability compared to the conventional CR. The mechanical strength e.g. Vickers hardness and compression strength was as same as the conventional CR. Then, we conclude that the glass flake powder was useful as the glass filler of CR.

View full abstract

Rare-earth doped Y2O3 particles were applied as filler for the ceramic composite resin. They can absorb near infrared light to emit blue upconversion fluorescence to achieve deeper the penetration depth of the irradiation.

View full abstract

[in Japanese]

View full abstract

[in Japanese]

View full abstract

[in Japanese]

View full abstract

Aiming to impart antibacterial function to the resin impregnated layer, adsorption/desorption properties of lysozyme on a collagen surface were investigated, using a QCM-D method. Lysozyme is known to adsorb on a charged surface by electrostatic interaction. Using this feature, pH-dependent adsorption of lysozyme on the collagen whose chage changes with pH was examined.

View full abstract

Surface deformation and stress distributions were determined for the wear surface of a fine-grained Ti-6Al-7Nb biomedical alloy. The deformation and the stress distributions were determined from peak broadening observed in powder diffraction with a scanning x-ray microbeam probe. Broadenings of powder diffraction peaks were observed, especially for the beta phase. Integrated diffraction spectrum suggested that crystalline orientation of the alpha phase occurred, and besides, the lattice parameter of the beta phase increased. A peak broadening analysis revealed that broadening was caused by deformation or faulting rather than by particle size refinement, and that higher strain was induced in the beta phase than in the alpha phase.

View full abstract

A major change in dental practice worldwide has been possible through the use of titanium implants. Light, strong and totally biocompatible, titanium is one of few materials that naturally match the requirements for implantation in the human body. Amino acids are the typical building blocks of biological molecules. They can be used as model molecules for adsorption of proteins on various surfaces. Glycine is the simplest structural block of protein and the smallest amino acid molecule. Protein adsorption is a very complicated process as it is regulated by numerous factors like pH, surface roughness, chemical composition, etc. A better understanding of adsorption properties of glycine on electrode surface is very important to elucidate the mechanism of complex metal-protein interactions. In addition, electrodeposited glycine could be used for base structure for immobilization of biofunctional molecules. In our work investigation of influence of pH of electrolyte and time on electrodeposition of glycine to titanium surface was carried out. Summary: This study illustrates the changing of the pH of electrolyte and time of interaction leads to a change of thickness of glycine layer and the direction of the amino acid immobilized by electrodeposition to titanium surface.

View full abstract

In previous study, we reported about discoloration, glossiness, and surface structure of titanium in a basic solution containing hydrogen peroxide for shortly immersion. In the present study, we evaluated the electrochemical corrosion behavior of commercially pure titanium, Ti-6Al-4V, and Ti-6Al-7Nb in basic solutions containing hydrogen peroxide.

View full abstract

[in Japanese]

View full abstract

Experimental Ti-Ag alloys (5, 10, 20, 22.5, 25, 27.5, 30 mass% Ag) were made by argon arc melt. Tensile strength, yield strength, elongation, hardness and elastic modulus of the alloys were investigated.

View full abstract

[in Japanese]

View full abstract

[in Japanese]

View full abstract

[in Japanese]

View full abstract

[in Japanese]

View full abstract

In the present study, influence of sandblasting and heat treatment on the low temperature degradation was evaluated through the biaxial flexure strength of yttria stabilized tetragonal zirconia polycrystals and the zirconia/alumina nanocomposite stabilized with cerium oxide. Storage conditions were as follows: physiological saline solution at 80ºC for 30 days; 4% acetic acid at 80ºC for 30 days; and autoclave at 121ºC for 10 days.

View full abstract

Amino acids are reported to be effective regulators in HAp formation. We synthesized hydroxyapatite with different molarity of amino acids (glycine and serine) and characterized the different physico-chemical properties of HAp-Gly and HAp-Ser. FTIR data confirmed that the Gly and Ser were included in the HAp. Adsorbed amount of protein (Cytochrome c, Bovine serum albumin) was more onto HAp-Gly and HAp-Ser than HAp. These data suggested that the presence of Gly and Ser during synthesis of hydroxyapatite would regulate its structure and surface chemistry.

View full abstract

[in Japanese]

View full abstract

We cultured macrophage (PMA-differentiated THP-1 cells) in medium containing 500 micro-mol/L copper ions for one day, and found its cell viability was 10%. We observed morphological change in its nucleus by DAPI staining and intracellular oxidative lipid damage by DPPP staining. TEM/EDX observations revealed that this cell became foam-shaped and copper ions accumulated in its nucleus, leading to damage of nucleus and de-generative change of the macrophage.

View full abstract

[in Japanese]

View full abstract

[in Japanese]

View full abstract

[in Japanese]

View full abstract

[in Japanese]

View full abstract

[in Japanese]

View full abstract

[in Japanese]

View full abstract

[in Japanese]

View full abstract

Internal structures and materials of non-Japanese dental magnetic attachments are not familiar to Japanese dentists compared with those of Japanese ones. The internal structures and the materials of gatherable non-Japanese and Japanese magnetic attachments were examined and compared in this study. Most of magnetic assemblies and keepers had structures without magnetic circuits that Nd-Fe type magnet cores were covered with titanium and a Ti-6Al-4V alloy, and they were attracted each other by both magnetic attraction.

View full abstract

Effects of nitrogen and boron addition on microstructure and mechanical properties of Co-Cr-Mo alloys were evaluated in this study. Co-Cr-Mo alloys were fabricated using high frequency induction furnace. Typical dendritic structures were observed in nitrogen and boron added Co-Cr-Mo alloys. The g phase (fcc) exists dominantly in both alloys. However, it was found that the shape of stress strain curves of boron added alloys was clearly different from that of nitrogen added alloys.

View full abstract

Zr has similar mechanical and chemical properties to Ti, however, it doesn't form any calcium phosphate precipitations in simulated body fluid. Hence, Zr and Zr based alloys have potential for substitute materials for Ti and Ti alloys to control bone adhesion property. However, Zr shows different corrosion behavior in simulated body fluid. Especially, occurrence of localized corrosion on Zr surface should be inhibited by designing the composition of the alloy. In this work, corrosion resistances of Zr based alloys in simulated body fluids were evaluated to clarify the effect of the addition of Nb and Ta.

View full abstract

In Europe, ozonized oil is used for the medical treatment of a skin disease and Candidiasis , etc. for many years. Synthesis over 50 hours was necessary for the manufacturing of this ozonized oil. Using the patent of the ozone occlusion material of authors, the equipment which could produce the ozonized oil adsorption sheet in several hours was produced experimentally, and it was reported in International Dental Materials Congress 2007. This study is reported, because this ozonized oil adsorption sheet manufacturing equipment was further improved.

View full abstract

[in Japanese]

View full abstract

[in Japanese]

View full abstract

In a human mandibular model with whole premolar and molar zone oblique to a sagittal plane, internal and external forces applied to the human mandible during masticatory activity were analysed by structural mechanics. The matrix was used to rotate the moment. We obtained shearing force diagram, bending moment diagram and torsion moment diagram. This method enabled to analyze models with the morphology close to that of a human mandible.

View full abstract

[in Japanese]

View full abstract

[in Japanese]

View full abstract

[in Japanese]

View full abstract

[in Japanese]

View full abstract

[in Japanese]

View full abstract

[in Japanese]

View full abstract

[in Japanese]

View full abstract

[in Japanese]

View full abstract

[in Japanese]

View full abstract

[in Japanese]

View full abstract

[in Japanese]

View full abstract

[in Japanese]

View full abstract