The oral rehabilitation of an edentulous patient, especially one with severe resorption, is a challenge for the clinician. In many cases, additional procedures such as bone grafting are required in order to obtain bone volume and finally to be able to place dental implants. Modern implantology attempts to solve the problem of total rehabilitations in severely atrophied jaws without the need for bone grafts. Surgical techniques such as all-on-four and its variants allow us to reduce morbidity in these cases by performing a single surgery, increasing the predictability of the treatment and reducing the waiting time, all in accordance with established surgical and prosthetic protocols, as well as protocols for immediate loading or early loading in cases where this is planned in this way.