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25 results on '"Oda, Yutaka"'

23. Comparison of denture base resin reinforced with polyaromatic polyamide fibers of different orientations.

Author

Sang-Hul YU, Dae-Hyung AHN, Ji-Su PARK, Yong Sik CHUNG, In-Sik HAN, Jung-Seop LIM, Seunghan OH, ODA, Yutaka, and Ji-Myung BAE

Subjects
POLYAMIDE fibers, FLEXURAL strength, RESIN adhesives, WOVEN composites, FLEXURAL modulus, EXPERIMENTAL groups
Abstract

The aim of this study was to evaluate the effect of reinforcing polyaromatic polyamide (aramid) fibers with various orientations on the flexural properties of denture base resin. Aramid fibers with four orientations of unidirectional, woven, non-woven and paper-type were pre-impregnated and placed at the bottom of a specimen mold. Heat-polymerized denture base resin was packed over the fibers and polymerized. A three-point bending test was performed using a universal testing machine at a crosshead speed of 5 mm/min. The flexural strengths and fiexural moduli of the unidirectional and woven groups were significantly higher than those of the control and other experimental groups. For the fiexural moduli, all experimental groups showed significantly higher reinforcing effects than the control group. In conclusion, the unidirectional group located perpendicular to the direction of the load was most effective in reinforcing the denture base resin, followed by the woven group. [ABSTRACT FROM AUTHOR]

Published
2013
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24. Flexural properties of three kinds of experimental fiber-reinforced composite posts.

Author

Mi-Joo Kim, Won-Chang Jung, Seunghan Oh, Hattori, Masayuki, Yoshinari, Masao, Kawada, Eiji, Oda, Yutaka, and Ji-Myung Bae

Subjects
FIBROUS composites in dentistry, DENTAL fillings, GLASS fibers, OPERATIVE dentistry, TEETH, DENTISTRY
Abstract

The aim of this study was to estimate the flexural properties of three kinds of experimental fiber-reinforced composite (FRC) posts and to evaluate their potential use as posts. Experimental FRC posts were fabricated with glass, aramid, and UHMWP fibers. Commercial FRC posts were used for comparison. A three-point bending test was performed at a crosshead speed of 1 mm/min. Experimental glass fiber posts showed significantly higher flexural strengths and moduli than aramid and UHMWP posts. Experimental UHMWP posts demonstrated superior toughness to the commercial posts. The glass fiber posts displayed stiff, strong and brittle features, while the UHMWP posts were flexible, weak and ductile. The flexural properties of the aramid posts fell between those of the glass and UHMWP posts. In conclusion, the glass fiber posts proved excellent in flexural strengths and moduli. However, the superior toughness of UHMWP fibers suggests the possibility of their use as posts in combination with glass fibers. [ABSTRACT FROM AUTHOR]

Published
2011
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25. Improved brushing durability of titanium dioxide coating on polymethylmethacrylate substrate by prior treatment with acryloxypropyl trimethoxysilane-based agent for denture application.

Author

Amano D, Ueda T, Sugiyama T, Takemoto S, Oda Y, and Sakurai K

Subjects
Dental Stress Analysis, Materials Testing, Surface Properties, Acrylates, Coated Materials, Biocompatible chemistry, Dental Restoration Wear, Denture Bases, Polymethyl Methacrylate, Silanes, Titanium, Toothbrushing
Abstract

The purpose of this study was to determine whether the brushing durability of a titanium dioxide coating on a polymethyl methacrylate (PMMA) substrate was improved by prior treatment with an acryloxypropyl trimethoxysilane-based agent. Titanium dioxide coatings were obtained by spray-coating substrates with or without prior treatment. Structure was investigated using IR, SEM, and an EPMA. Effect on durability against brushing was determined with a brush-wear test machine utilizing a commercial denture brush. A thin layer comprised of siloxane and TiO(2) was formed on a PMMA substrate by prior treatment with an acryloxypropyl trimethoxysilane-based agent and spray-coating of TiO(2). Prior treatment demonstrated improved stability against brushing, whereas the titanium coating was removed after less than 1x10(5) brushing cycles without prior treatment. This suggests that prior treatment with an acryloxypropyl trimethoxysilane-based agent would confer improved durability against brushing-induced stress on a TiO(2) coating in its application to dentures.

Published
2010
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