P-7 エトキシ化率の異なるビスフェノールAジメタクリレートのコンポジットレジンへの応用(研究奨励賞応募ポスター発表,第60回日本歯科理工学会学術講演会(創立30周年記念大会))

概要

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Experimental light cure composite resins, whose monomeric component was 2,2-bis[4-(methacryloxypolyethoxy)phenyl]propane with different numbers of ethoxy groups, were made. The macrofiller of particle size of 1μm and the microfiller of particle size of 50nm were mixed at 3:1 in weight. The hybrid filler was treated by γ-MPTS at the concentration of 5 molecules/nm^2 and its filler content of experimental composite was 70wt%. Their mechanical strength and the consistency was investigated. The composite resin made of the mixture of bis-GMA and TEGDMA was used as a control. The mechanical strength, i.e. compressive strength, diametral tensile strength and bending strength, and the consistency was investigated as a function of the number of ethoxy groups. It was found that the mechanical strength decreased in direct proportion to the increase of the number of ethoxy groups, but there was no correlation between the consistency and the number of ethoxy groups. From these results, it should be careful to choose the number of ethoxy group as a base monomer of composite resin.
2012-09-25