Impact of Preparation Designs and Distinct restorations on Marginal Precession, and Fracture Resistance of CAD/CAM Fabricated Endocrowns in Pulpally Treated Deciduous Molars

Aim: This study aimed to evaluate the impact of preparation designs and distinct restorations on marginal Precession, and fracture resistance of CAD/CAM fabricated endocrowns in pulpally treated Deciduous molars. Subjects and Methods: in-vitro experimental study involved 60 primary molar teeth, which underwent pulpotomy and standardized endo crown preparation. The utilized teeth were split into 6 groups by random method (10 teeth/group) depending on the restorative material used G 1: sound primary molars, G 2: pulpotomized primary molars with no coronal restoration, G 3: restored with Beautifil Flow Plus X, G 4: restored with CAD/CAM Milled Poly-methyl methacrylate., Group 5: restored using lithium disilicate endocrown. G 6: restored by CAD/CAM Milled dental zirconia block. All samples were exposed to fracture testing using a universal testing machine with compressive power applied. Results: in regard to Fracture resistance, half depth: Zirconia had the greatest mean value, then Composite, E. max, and the PMMA group. All groups were statistically significant. Complete depth: Zirconia had the greatest mean value, which was followed by the PMMA group, Composite, and E. max. One-third of the samples in the zirconia group displayed a good fracture, while 33.3% of the samples in the E-max group revealed a fractured tooth and restoration. Conclusion: Within the parameters of this investigation, our work implies that teeth treated with a pulpotomy may, therefore, be restored using endocrowns. The zirconia showed higher fracture resistance than composite, PMMA and lithium disilicate endocrowns. Marginal gap is higher in PMMA than other material.