Fracture resistance of lithium disilicate ceramic cemented on dentin with different curing strategies
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Abstract
Objectives: To determine the effect of lithium disilicate ceramic thickness and curing mode of resin cement on the compressive fracture resistance of ceramic restored on dentin.
Methods: The ceramic disk-shaped specimens with a diameter of 7-mm with different thickness of 0.8-mm and 1.5-mm were produced equally from CAD/CAM lithium disilicate ceramic block (e.max CAD). The specimen disk was cemented on flattened dentin using universal adhesive (Single Bond Universal; SBU) with resin cement (RelyX Ultimate; ULT) in two different curing modes (n=8); 1) light-curing of adhesive and resin cement (LL) and 2) co-curing of adhesive through light-curing of resin cement (AL). The compressive fracture load was indented perpendicular to the restorative surface using a universal testing machine until the restoration was fractured. The fracture loading (N) was statistically analyzed using two-way ANOVA and Tukey’s Post-Hoc test (α=0.05).
Results: The ceramic thickness and curing mode of resin cement were statistically significant at p<0.05. The thicker restorative material could withstand higher fracture resistance. The cementation with adhesive and resin cement in light-curing mode SBU/ULT(LL) performed better fracture resistance than co-curing mode SBU/ULT(AL) at the same thickness.
Conclusion: The adequate thickness of lithium disilicate ceramic improved fracture resistance. The separately light-curing on adhesive and cement has been recommended for adhesive cementation to increase the fracture resistance of restoration.
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References
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