Comparative Evaluation of All on 4 versus All on 6 Implant Supported Full Arch Prostheses: A Review of Clinical Outcomes, Biomechanics, and Prosthetic Considerations

AbstractFull arch implant-supported prosthetic rehabilitation has become the standard of care for edentulous patients. The All-on-4 and All-on-6 implant concepts are widely practiced techniques designed to provide immediate function and long-term stability. This review critically compares both concepts in terms of biomechanics, implant survival, prosthetic design, complications, and patient-centered outcomes. Evidence suggests that while both protocols offer high success rates,All-on-6 demonstrates superior stress distribution and prosthetic support in patients with adequate bone volume.