All-on-X Stackable Guides for Maxillary Terminal Dentition

Inclusion Criteria: Adult patients presenting with terminal dentition of the maxillary arch Rehabilitation with a maxillary All-on-6 implant-supported complete fixed dental prosthesis Treatment performed using a fully digital stackable guided surgery workflow Immediate loading with a provisional fixed prosthesis Availability of complete clinical and radiographic records Minimum follow-up period of 2 years Prosthetic design classified as (Fixed prosthesis) FP-1 or FP-2 according to Misch classification Exclusion Criteria: Uncontrolled systemic conditions contraindicating implant surgery History of head and neck radiotherapy Presence of untreated periodontal or peri-implant infection at the time of surgery Incomplete or missing clinical or radiographic records Cases requiring simultaneous bone grafting procedures Severe maxillary atrophy (Cawood and Howell Class III-V) Cases requiring FP-3 prosthetic design Rehabilitation performed without guided surgery or without immediate loading