Prosthetic Outcomes and Clinical Performance of Implant Supported Zirconia Crowns

Study design: A short-randomized controlled trial study, the (PICO) study design: population will be patients from Jordan University Hospital with implants planned for single screw-retained zirconia crowns in the posterior site (premolar or molar), intervention will be the multilayer monolithic screw-retained zirconia crowns over implants, the comparator is the conventional monolithic zirconia crowns over implants, and the main outcomes will be the prosthetic/technical outcomes, survival and success rates in addition to radiographic, patient-reported outcomes, and biological parameters. Methodology The patients who fulfilled the inclusion/exclusion criteria and entered the study will have a fully digital workflow starting from data acquisition using an intraoral scanner (3Shape TRIOS® 5) , Ti-base abutment design and CAD/CAM milling of the two types of monolithic zirconia blanks (IPS e.max® ZirCAD Prime and IPS e.max® ZirCAD LT). The fabricated zirconia crowns in both groups will have the same treatment and will be cemented to the Ti-base abutment according to the (APC) concept; alumina airborne-particle abrasion 50-μm at 1 bar for 15-20 seconds, intaglio surface primed using MDP for 60 seconds and air blown for 5 seconds, and finally cemented to the abutment by phosphate monomer resin cement PANAVIA™ V5(Blatz-Alvarez-Compendium-APC-2016, n.d.). On the other hand, the Ti-base abutment: height will be standardized at 4mm, and the base abutment surface will have blasting with alumina particles of 50 μm at 2-bar pressure for 15-20 seconds at a 10-mm step-over distance at an angle of 45 degrees.