Abstract
To improve the water resistance of polysiloxane at the silica-resin interface, a mixture of 3-methacryloyloxypropyltrimethoxysilane(3-MPS)and 1H, 1H, 2H, 2H-nonafluorohexyl-trimethoxysilane(4F)was used. The concentration of each silane solution was adjusted with ethanol at 2 mass%, at the ratio of 4F/3-MPS=1/4. A resin composite was adhered to the modified glass plate, and stored in deionized water up to 720 days or subjected to thermal stress for 10, 000 cycles. The tensile bond strength of the composite to the glass plate treated with 4F/3-MPS showed no significant change after immersion in water or the thermal cycling. The contact angles of resin monomer, a mixture of 50% Bis-GMA and 50% TEGDMA, to the glass plate treated with 4F/3-MPS were significantly lower than with 3-MPS alone. Therefore, the silane mixture of 3-MPS and hydrophobic 4F formed a coupling layer with a high bond strength and high water resistance ability at the silica-resin interface.
