Abstract
This in vitro study aimed to evaluate the effects of different luting protocols on the thickness of luting interface of ceramic laminate veneers. Thirty-six lithium disilicate blocks (7 × 8 × 0.6 mm) were cemented onto bovine enamel. They were divided into 6 groups based on the luting protocol (no previous photoactivation of the dental adhesive; previous activation of the dental adhesive only on enamel surface; and previous photoactivation of the dental adhesive on both the enamel surface and inner surface of ceramic laminate) and the luting materials used (Single Bond Universal/RelyX Veneer and Tetric N Bond/Variolink Veneer). The luting interface thickness of ceramic laminate veneers was evaluated using a laser scanning confocal microscope (n = 6). The luting interface measurements were analyzed using 2-way ANOVA and the Tukey least significant difference test (α = 0.05). Prior activation of the adhesive on the dental enamel and inside the ceramic laminate exhibited higher luting interface thickness than that with no prior photoactivation of both luting materials (p < 0.05). Specimens cemented with Tetric N Bond/Variolink Veneer, submitted for prior photoactivation of the adhesive on the dental enamel and on both dental enamel and inner surface of ceramic, exhibited lower luting interface thickness than those luted with Single Bond Universal/RelyX Veneer (p < 0.05). The prior photoactivation of dental adhesives influenced the thickness of luting interface in laminate restorations. Tetric N Bond/Variolink Veneer yielded more satisfactory results than Single Bond Universal/RelyX Veneer when the adhesive was light activated.
Highlights
MethodologyThe dental adhesive (Single Bond Universal; 3M ESPE, St Paul, USA) was applied for 20 seconds without activation, and the solvent evaporation was performed as described above
This in vitro study aimed to evaluate the effects of different luting protocols on the thickness of luting interface of ceramic laminate veneers
Translucent light-activated resin cement (RelyX Veneer; 3M ESPE, St Paul, USA) was applied on the intaglio ceramic surface and the restoration was positioned on the dental enamel substrate
Summary
The dental adhesive (Single Bond Universal; 3M ESPE, St Paul, USA) was applied for 20 seconds without activation, and the solvent evaporation was performed as described above. Translucent light-activated resin cement (RelyX Veneer; 3M ESPE, St Paul, USA) was applied on the intaglio ceramic surface and the restoration was positioned on the dental enamel substrate. TNBWPA group specimens were luted as described for the SBUWPA; the luting materials used were Tetric N Bond dental adhesive, Monobond Plus silane agent, and medium value shade Variolink Veneer resin cement (Ivoclar Vivadent, Schaan, Liechtenstein). Specimens from each experimental group were submitted to an aging process using the EQUV UV-accelerated aging machine (Equilam, Diadema, SP, Brazil) with eight fluorescent lamps (40 W each) according to the ASTM –G154 test (American Society for Testing and Materials).[2,3] Alternating periods of exposure of UV-light and condensation with distilled water were established under conditions of 100% relative humidity and heat.
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