Subperiosteal implantology emerged around 1950 as an alternative technique to implant-prosthetic treatment of severe maxillary atrophy. Although it has maintained the same field of application, it has undergone several changes over the years, starting at the end of the last century with the introduction of titanium alloy implants built on a 3D resin model, up to the current digital PSI (IUXTA 3D implant).

The importance of correct diagnosis is emphasized, the parameters for making the right indications are analyzed, the digital workflow, the surgical technique, the prosthetic protocol and, finally, the analysis and prevention of complications of the IUXTA 3D technique for implant-prosthetic treatment of severely atrophic jaws are described.