It is a type of prosthetic treatment that is mainly made on four implants, placed in the lower or upper jaw. It consists of a metal (titanium, cobalt-chrome) bar that is tightened on four implants and prostheses that clings to the existing metal bar. The work is semi-fixed because the prosthesis is completely fixed and stable in the mouth, but can be removed for a good oral hygiene during the day. It is very pleasing for the patient, because it is made in the upper jaw without an artificial palate, which is not the case with classic total dentures.