3D-printed Endocrowns Versus Prefabricated Zirconia Crowns in Pulpally-treated Primary Molars

Aim of the study : to compare between 3D printed microfilled hybrid composite endocrowns and prefabricated zirconia crowns for restoring pulpally treated primary molars regarding the following aspects: In Vivo aspects Patient satisfaction \*The esthetic, functional and biological performance according to FDI clinical criteria. At 3, 6 and 12 months In Vitro aspects: * Marginal gap. * Fracture resistance. Study methodology: This study is a combined randomized clinical trial and in vitro study .The study will be conducted at the Department of Pediatric Dentistry and Dental Public Health, Faculty of Dentistry, Ain Shams University as follows: In vivo comparison of the clinical performance of 3D printed Endocrowns versus prefabricated zirconia crowns regarding esthetic, functional and biological performance according to FDI clinical criteria. In vitro evaluation of the marginal gap and fracture resistance of both types of restorations.