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KMID : 0362420080460050535
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Journal of Korean Academy of Prosthodontics
2008 Volume.46 No. 5 p.535 ~ p.543
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The study of shear bond strength of a self-adhesive resin luting cement to dentin
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Ahn Hee-Sun
Dong Jin-Keun
Cho Hye-Won
Choi Jong-In
Park Jong-Il
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Abstract
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Purpose: The objective of this study was to compare the bonding characteristics of a new self-adhesive resin cement to dentin, which doesnot require bonding and conditioning procedure of the tooth surface , and conventional resin cement. The effect of phosphoric acid etchingprior to application of self-adhesive resin cement on the shear bond strength was also evaluated.
Material and methods: Fortyfive non-cari-ous human adult molars extracted within 6 months were embedded in chemically cured acrylic resin. The teeth were ground with a series ofSiC-papers ending with 800 grit until the flat dentin surfaces of the teeth were exposed. The teeth were randomly divided into 3 experimen-tal groups. In group 1, self-adhesive resin cement, RelyX Unicem (3M ESPE, Seefeld, Germany) was bonded without any conditioning ofteeth. In group 2, RelyX Unicem was bonded to teeth after phosphoric acid etching. For group 3, Syntac Primer (Ivoclar Vivadent AG,Schaan, Liechtenstein) was applied to the teeth before Syntac adhesive (Ivoclar Vivadent AG, Schaan, Liechtenstein) and Helibond (IvoclarVivadent AG, Schaan, Liechtenstein) followed by conventional resin cement, Variolink II (Ivoclar Vivadent AG, Schaan, Liechtenstein). Tomake a shear bond strength test model, a plastic tuble (3 mm diameter, 3 mm height) was applied to the dentin surfaces at a right angle andfilled it with respective resin cement, and light-polymerized for 40 seconds. All the specimens were stored in distilled water at 37℃ for 24hours before test. Universal Testing Machine (Z020, Zwick, Ulm, Germany) at a cross head speed of 1 mm/min was used to evaluate theshear bond strength. The failure sites were inspected under a magnifier and Scanning Electron Microscope. The data was analyzed with Oneway ANOVA and Scheffe test at α= 0.05.
Results: (1) The shear bond strengths to dentin of RelyX Unicem was not significantly differentfrom those of Variolink II/Syntac. (2) Phosphoric acid etching lowered the shear bond strength of RelyX Unicem significantly. (3) Most ofRelyX Unicem and Variolink II showed mixed fractures, while all the specimens of RelyX Unicem with phosphoric acid etching demon-strated adhesive failure between dentin and resin cement.
Conclusion: Shear bond strength to dentin of self-adhesive resin cement is not sig-nificantly different from conventional resin cement, and phosphoric acid etching decrease the shear bond strength to dentin of self-adhesiveresin cement.
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KEYWORD
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Shear bond strength, Resin cement, Self-adhesive resin cement, Phosphoric acid
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