IADR Abstract Archives
Mini-interfacial Fracture Toughness of CAD-CAM Blocks Adhesively Luted onto Dentin
Objectives: The mini-interfacial fracture toughness (mini-iFT) test is considered a valid method to assess bonding effectiveness. However, this new method has not been used yet to evaluate the bond of adhesively luted CAD-CAM ceramic blocks onto dentin.
Methods: Cerasmart (A2 LT; GC) blocks were luted to human dentin covered with a standardized bur-cut smear layer using 3 composite cement systems: G-Premio / G-Cem Link Force (G-Premio, GC), Scotchbond Universal / RelyX Ultimate (SBU, 3M ESPE) and Multilink Automix (Multilink, Ivoclar Vivadent). The multi-mode adhesives G-Premio and Scotchbond Universal were applied in an etch-and-rinse (ER) or self-etch (SE) mode. Groups were either light-cured (LC) or self-cured (SC). After 1-week water storage, 2 mini-iFT specimens (1.5x2.0x16-18mm) with a single notch at the adhesive-dentin interface were prepared per tooth (8 teeth per group) and loaded until failure in a 4-point bending test to determine KIC.
Results: 1-way ANOVA revealed significant differences among the different adhesive cementation systems. Multilink performed the least and was the only group with pre-test failures (68%). The highest mini-iFT was recorded for ‘SBU-ER-SC’, which was significantly higher than that recorded for the other SBU groups. Different application and curing modes did not affect the mini-iFT of the G-Premio groups.
Conclusions: Mini-iFT proved to be a valid method to evaluate adhesive cementation systems; the data revealed a product-depending luting performance. While G-Premio resulted in similar mini-iFT irrespective the adhesive luting mode, SBU revealed a varying performance being highest for SBU-ER-SC.
Methods: Cerasmart (A2 LT; GC) blocks were luted to human dentin covered with a standardized bur-cut smear layer using 3 composite cement systems: G-Premio / G-Cem Link Force (G-Premio, GC), Scotchbond Universal / RelyX Ultimate (SBU, 3M ESPE) and Multilink Automix (Multilink, Ivoclar Vivadent). The multi-mode adhesives G-Premio and Scotchbond Universal were applied in an etch-and-rinse (ER) or self-etch (SE) mode. Groups were either light-cured (LC) or self-cured (SC). After 1-week water storage, 2 mini-iFT specimens (1.5x2.0x16-18mm) with a single notch at the adhesive-dentin interface were prepared per tooth (8 teeth per group) and loaded until failure in a 4-point bending test to determine KIC.
Results: 1-way ANOVA revealed significant differences among the different adhesive cementation systems. Multilink performed the least and was the only group with pre-test failures (68%). The highest mini-iFT was recorded for ‘SBU-ER-SC’, which was significantly higher than that recorded for the other SBU groups. Different application and curing modes did not affect the mini-iFT of the G-Premio groups.
Conclusions: Mini-iFT proved to be a valid method to evaluate adhesive cementation systems; the data revealed a product-depending luting performance. While G-Premio resulted in similar mini-iFT irrespective the adhesive luting mode, SBU revealed a varying performance being highest for SBU-ER-SC.
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