The All-on-4® treatment concept is a technique for the total rehabilitation of the edentulous patient or for patients with badly broken-down teeth, decayed teeth, or compromised teeth due to periodontal disease. It is performed by placing four implants in either arch with the distal-most implants being placed in a tilted position to increase support for a fixed prosthesis. This tilted placement allows patients to undergo prosthetic surgery without first requiring a bone graft as it utilizes already available bone. In addition, with the All-on-4® technique, the prosthesis is usually placed immediately on the day of surgery, though patients must first be carefully evaluated to ensure they meet the criteria needed for immediate implant loading. The patient benefits of All-on-4® include no need for bone grafts, immediate function and aesthetics of the prosthesis, fewer surgeries, reduced healing time, and less expense. All-on-4® is a registered trademark of Nobel Biocare.