Implant prostheses should be temporarily cemented if alterations are foreseeable. If the implants have osseointegrated successfully and no soft tissue management will be necessary, the restorations can be fixed permanently.
In some cases we combine fixed abutments and screwed abutments in one implant superstructure. The indications are bridges with only little friction and superstructures on several implants when there are reasons to have the prosthesis removable. In this combination, cementation on the fixed abutments must always be temporary.