Showing papers by "Hideo Matsumura published in 1990"

Adhesive Bonding of Titanium with a Titanate Coupler and 4-META/MMA-TBB Opaque Resin

Abstract: Adhesive bonding of titanium was evaluated with a titanate primer and adhesive opaque resin. The primer consisted of 2% isopropyl dimethacryloyl isostearoyl titanate in methyl methacrylate. The adhesive was 4-META/MMA-TBB opaque resin that contained 4-methacryloyloxyethyl trimellitate anhydride and was initiated by tri-n-butylborane derivative. Titanium discs were machined and blasted with aluminum oxide. They were primed and bonded together with the opaque resin. A shear test was performed after repeated thermocycles for investigation of the durability of the bond. The shear strength of the primed and 4-META resin-bonded specimens was 37.2 MPa after 50,000 thermocycles, with only a small decrease in bond strength. This was significantly higher than the control values. Thus, titanate primer and 4-META/MMA-TBB opaque resin may be used for the bonding of titanium in prosthodontic practice.

Monomer Composition and Bond Strength of Light-cured 4-META Opaque Resin

Abstract: A light-cured opaque resin was prepared with 4-(2-methacryloxyethoxycarbonyl) phthalic anhydride (4-META), bifunctional methacrylates, and titanium dioxide (TiO2). The relation between monomer composition and bond strength was examined with seven methacrylate monomers. Methyl methacrylate (MMA) was useful as a solvent of 4-META. However, it was not sufficiently cured by photo-initiator. The bond strength of a triethyleneglycol dimethacrylate (TEGDMA)-based composition was superior to other monomer-based compositions after repeated thermocycles. 1,6-bis(methacryloxy-2-ethoxycarbonyl-amino)-2,4,4-trimethylhex ane (UDMA) effectively provided viscosity to the composition. The prepared opaque resin consisted of 4-META/MMA-TEGDMA primer, TEGDMA-UDMA-based monomer, and titanium dioxide. This opaque resin bonded strongly to alumina-blasted cobalt-chromium alloy. The light-cured 4-META opaque resin may be useful for bonding prosthodontic composite to metal frameworks.

Some properties of commercially available light-cured opaque resins.

Abstract: Chemical composition of four commercially available light-cured opaque resins was investigated and properties of the resins; depth of cure, amount of residual monomer eluted from these materials and shear bond strength were evaluated. Monomer part of the opaque resins consisted of methyl methacrylate (MMA), di (methacryloxyethyl) trimethylhexamethylene diurethan (UDMA), neopenthylglycol dimethacrylate (NPG), triethyleneglycol dimethacrylate (3 G), 2, 2-bis (4-methacryloxypolyethoxy phenyl) propane (2.6 E) and 2, 2-bis [4-(3-methacryloxy-2-hydroxy propoxy) phenyl] propane (Bis-GMA). Inorganic filler content of the materials were in the range of 48 to 96 wt%. Two opaque resins showed large ash content. The shape of the filler was the splinter large fillers and the size was about over 10 μm. Within the three MMA-based opaque resins, depth of cure increased with decrease in MMA content of monomer composition, while amount of residual monomer opposed. The bond strengths of three opaque resins joined to alumina-blasted and heated Au-Ag-Pd alloy were 12 to 13 MPa after 5, 000 thermocycles. However, the one resin showed 0 MPa. These results suggest that it should be necessary to improve the bond strength, photo-curability and handling properties of the opaque resins, and to examine the optimal composition of the light-cured opaque resin.

A light-cured opaque resin with high bond strength.

Abstract: Light-cured adhesive opaque resins with high bond strength were prepared with the use of 4-methacryloxyethyl trimellitate anhydride (4-META), eleven methacrylate monomers and composite pigment. The purpose of this study was to investigate the relation between the monomer composition and the bond strength of the opaque resin. The shear bond strengths of ethyleneglycol dimethacrylate (1 G), diethyleneglycol dimethacrylate (2 G) and triethyleneglycol dimethacrylate (3 G)-based opaque resins were superior to those of other monomerbased opaque resins after thermocycles. A methyl methacrylate (MMA)-based opaque resin showed poor bond ability. 1, 6-bis (methacryloxy-2-ethoxycarbonylamino)-2, 4, 4-trimethylhexane (UDMA) effectively provided viscosity to the compositions. The prepared opaque resin, which consisted of 4-META/MMA-3 G primer, 3 G-UDMA base monomer and titanium dioxide-polymethacrylate composite pigment, bonded strongly to the alumina-blasted cobaltchomium alloy. This opaque resin may be useful to bond fixed prosthodontic composite and metal frameworks.