Comparison of Resin Composite and Biodentine Cervical Marginal Elevation on the Marginal Gap of Two Computer-Aided Design/Computer-Aided Manufacture Endocrown Materials: In Vitro Study

Objective: This study is the impact of resin composite and bio dentine cervical marginal elevation on vertical marginal gap using two CAD/CAM endo-crowns. Materials and Methods: 32 molars were employed, separated into two main groups: Group R, which included 16 molar teeth elevated distally with resin composite each; and Group B, which included 16 molar teeth elevated distally with dentine. The prepared teeth were then restored using endo-crown restorations. There were 2 equal subgroups for each main group (Vita MarkII and Lava Ultimate endo-crowns; n = 8). The samples underwent thermocycling (TC) after the restorations were bonded using dual-cure resin cement. A digital microscope was used to measure the vertical marginal gap. Results: A significant difference in the vertical marginal gap following thermocycling in all groups, except for the Resin composite. The polymer-based group demonstrated better marginal adaptation than other groups. The marginal accuracy produced by the marginal elevation approach, which involves placing a composite filling and dentine in the proximal box before the insertion of ceramic indirect restorations, is comparable to those of ceramics implanted in dentine without margin elevation. Conclusion: The margin elevation technique ensures that the margins created with these materials are as precise as those placed directly in dentin.