ボンディング材の諸性質がエナメル質との接着強さに及ぼす影響

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The use of the composite resin has been rapidly increasing because of its superior esthetics as well as improved bonding systems by the introduction of the enamel etching and new formulation of the bonding agents. The conventional bonding agents are merely composed of the same monomers as the respective composite resins have. They are enough fluid to penetrate into the grooves among the etched enamel prisms and form resin tags to cause the mechanical interlocking between the resin and the enamel. On the other hand, the new bonding agents contain some adhesive to tooth structure, and they may bond the composite resin mechanically and chemically to the enamel as expected resulting in better retention and marginal sealing. However, there are very few papers on the quantitative consideration for the chemical bond between the resin and the tooth. In the present study, therefore, the chemical reactivity with hydroxyapatite and the bond strength to the enamel were examined for one conventional bonding agent and four adhesive-containing agents. It was evidenced that the adhesive-containing bonding agents were capable of reacting chemically with hydroxyapatite although the reactivity was different among the agents. It was also found that the reaction was accelerated when the hydroxyapatite was etched with acid and the pH of the agent was lower. The higher the reactivity with hydroxyapatite and the lower the polymerization shrinkage of the bonding agent were, the higher was the bond strength between the bonding agent and the unetched enamel. It indicates that the chemical adhesion of the bonding agent would be reasonably effective for tight bonding to the enamel. The chemical adhesion, however, appeared insufficient on the unetched enamel since the fractograph at the interface after tensile test showed mixed aspect of cohesional and adhesional failures even if the bonding agent having maximum chemical reactivity with hydroxyapatite was used. When the enamel was etched with acid, the bond strength was significantly increased for all the bonding agents used. The bond strength to the etched enamel was well correlated with the shear strength of the bonding agent itself together with the two factors mentioned above for the unetched enamel. As a wide variation from 0.5 to 40% was observed in the polymerization shrinkage among the bonding agents, it is advisable to apply the agent twice or more on the enamel to increase the contact area in oder to make sure the better bonding if the agent with high polymerization shrinkage is to be used.
九州歯科学会の論文
1986-02-25

著者

蕭庸雄
九州歯科大学大学院歯学研究科

ボンディング材の諸性質がエナメル質との接着強さに及ぼす影響

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