Shear Bond Strength between a New Self-adhesive Resin Cement to Human Dentin
The purpose of this study was to compare the shear bond strength between a new selfadhesive resin cement (RelyX™ U200) and human dentin with the multi-step resin cements (Variolink® N, Multilink® N) and the conventional self-adhesive resin cement (RelyX™ Unicem). Thirty-four third molars were sectioned into half from mid-mesial to mid-distal and their external surfaces ground to expose dentin. They were then divided into four groups of seventeen by type of resin cements: Variolink® N with 37% phosphoric acid and Excite® DSC, Multilink® N, RelyX™ Unicem, and RelyX™ U200. Resin composite rods were bonded to each group with the different resin cements. All specimens were stored in 37°C distilled water for 24 hours, then fifteen specimens from each group were loaded in the Universal Testing Machine for shear bond strength test. The failure surfaces of resin cements and dentin were examined using a light stereomicroscope. Statistical analysis of the mean shear bond strength were performed by One-way ANOVA and the Tukey multiple comparison test (p<0.05). Two specimens of each group were determined for resin-dentin interface by SEM evaluation. The results of this study found that the mean shear bond strength of RelyX™ U200 group was the lowest (8.3±3.7 MPa) and significantly lower than Multilink® N group (20.1±8.1 MPa) and Variolink® N group (15.8±6.8 MPa) but not different from RelyX™ Unicem group (12.6±4.2 MPa). The failure mode mostly was adhesive failure between resin cement and dentin. In conclusion, the mean shear bond strength of a new self-adhesive resin cement (RelyX™ U200) was lower than the multi-step resin cements, but not different from the conventional self-adhesive resin cement. Multilink® N showed the highest mean shear bond strength.
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