IADR Abstract Archives
Shear Bond Strength of a Novel Universal Cement to Dentin
Objectives: Recently, a novel universal resin cement (RelyX Universal Resin Cement, 3M) has been marketed for indirect bonding applications as either a stand-alone self-adhesive cement or as an adhesive cement depending on the clinical indication. The purpose of this study was to evaluate the bond strength to dentin of the universal resin cement compared to self-adhesive and adhesive resin cements with and without an adhesive bonding agent.
Methods: Seventy-two molar teeth were sectioned to expose coronal dentin, divided into 3 groups, and assigned to RelyX Universal (universal), RelyX Ultimate (adhesive), or RelyX Unicem 2 (self-adhesive) cements. The three groups were further subdivided into two subgroups of 12 specimens each, with or without the use of Scotchbond Universal Plus Adhesive (3M). Lithium-disilicate discs (IPS e.max CAD, Ivoclar Vivadent) were milled, crystallized, etched (HF), silanated and bonded to the dentin surface using the cements. All specimens were light cured, stored for 24 hrs (37°C) in distilled water, and subjected to 2000 thermocycles before shear bond strength testing. Data were analyzed with T-tests/ANOVAs/Tukey’s (alpha=0.05).
Results: Significant differences in bond strength were found between groups based on cement or use of a bonding agent (p<0.05). See table. Both the universal and adhesive cements had significantly greater bond strengths to dentin with use of a bonding agent versus no bonding agent. With the self-adhesive cement, there was no significant increase in bond strength to dentin with the use of a bonding agent.
Conclusions: The novel universal resin cement (RelyX Universal) had similar bond strengths to dentin as the adhesive cement (RelyX Ultimate) with the use of a bonding agent, and similar bond strengths to dentin as the self-adhesive cement (RelyX Unicem 2) without the use of a bonding agent, suggesting it may be used as either a self-adhesive, or as an adhesive resin cement, depending on the clinical situation.
Methods: Seventy-two molar teeth were sectioned to expose coronal dentin, divided into 3 groups, and assigned to RelyX Universal (universal), RelyX Ultimate (adhesive), or RelyX Unicem 2 (self-adhesive) cements. The three groups were further subdivided into two subgroups of 12 specimens each, with or without the use of Scotchbond Universal Plus Adhesive (3M). Lithium-disilicate discs (IPS e.max CAD, Ivoclar Vivadent) were milled, crystallized, etched (HF), silanated and bonded to the dentin surface using the cements. All specimens were light cured, stored for 24 hrs (37°C) in distilled water, and subjected to 2000 thermocycles before shear bond strength testing. Data were analyzed with T-tests/ANOVAs/Tukey’s (alpha=0.05).
Results: Significant differences in bond strength were found between groups based on cement or use of a bonding agent (p<0.05). See table. Both the universal and adhesive cements had significantly greater bond strengths to dentin with use of a bonding agent versus no bonding agent. With the self-adhesive cement, there was no significant increase in bond strength to dentin with the use of a bonding agent.
Conclusions: The novel universal resin cement (RelyX Universal) had similar bond strengths to dentin as the adhesive cement (RelyX Ultimate) with the use of a bonding agent, and similar bond strengths to dentin as the self-adhesive cement (RelyX Unicem 2) without the use of a bonding agent, suggesting it may be used as either a self-adhesive, or as an adhesive resin cement, depending on the clinical situation.
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