This prospective observational clinical study aims to compare 12-month clinical, radiographic, and patient-reported outcomes of monolithic zirconia full-arch implant-supported prostheses placed in the maxilla versus the mandible. The study also investigates whether mandibular morphology (U-shaped vs V-shaped) and arch geometry (inter-implant distance and cantilever length) are associated with early marginal bone remodeling. All arches were rehabilitated following standardized surgical and digital prosthetic protocols.