Abstract Objective: This study evaluated the effect of deep marginal acquisition (DMA) using an ion-releasing material, resin modified glass ionomer and nano-hybrid flowable composite on the fracture resistance of molars with Class II MOD cavities restored with pressable lithium-disilicate ceramic onlays. Materials and methods: Fifty molar teeth were randomly assigned to one of five groups (n=10/group): Enamel (EN), Cementum (CE), Cention forte (CF), Tetric-N flow (TF), and Resin modified glass ionomer (RM) groups. Specimens were prepared for a standard MOD cavity with margins located 2 mm below the CEJ for CF, RM, TF, and CE groups, while EN group had margins located 1 mm above the CEJ. DMA was used to elevate the margins to 1 mm above the CEJ. For CE group, the ceramic onlay was placed without DMA. Standardized IPS e.max press ceramic onlays were pressed from IPS e. max press ingots and all specimens were bonded using Multilink Sprint (Ivoclar Vivadent, Schaan, Liechtenstein) according to the manufacturer’s instructions. All teeth were subjected to 10,000 cycles of thermocycling (5°C/55°C). The fracture resistance of each group was measured using a universal testing machine. Data was statistically analyzed using one-way ANOVA test. Results: Fracture strength values were subjected to one-way ANOVA revealed statistically non-significant differences among experimental groups (p=0.07). Conclusion: Within the parameters of this study, the materials had non-significant difference in fracture resistance. Therefore, collective findings suggest that these materials were suitable for DMA.
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