Adhesion of a New Liner with Resin Cements

Objectives:   Evaluate the effect of a new resin modified glass ionomer (RMGI) liner on the adhesion of two commercially available resin cements. The RMGI liners were 3M™ ESPE™ Vitrebond™ Plus Liner/Base (VBP), and 3M™ ESPE™ Vitrebond™ Liner/Base (VB); the resin cements were 3M™ ESPE™ Unicem™ Self-Adhesive Resin Cement (UNI), and  3M™ ESPE™ RelyX™ ARC Adhesive Resin Cement (RXA).  VBP is a  new resin-modified glass ionomer material in a paste/paste delivery, which exhibits the aluminum-carboxylate crosslinking reaction and fluoride release of a true glass ionomer. Methods:   Shear bond strength was measured on bovine dentin using the wire loop method (crosshead speed 1 mm/min) on an Instron 1123.  A 0.3mm tape spacer  ensured a reproducible, uniform layer of the liner on the dentin; the mixed cement was applied to silanated surface (3M™ ESPE™ RelyX™ Ceramic Primer) of composite buttons (3M™ ESPE™ Paradigm™ MZ100 blocks), which were then pressed firmly onto the liner, and then light cured.  The samples were immersed in 37C deionized water for 24h before testing.  The material combinations are shown in the Table.  The data were analyzed via one-way ANOVA and compared with Tukey's T-test  (p=0.05). Results: