Treatment A: The XiVE® CAD/CAM supra-structure is fixed on abutments. The effect of platform-switching which is discussed intensely in the scientific literature is used in order to shift away the connection between implant and supra-construction (interface) from the implant edge and peri-implant tissue and towards the implant centre. However, the implant-abutment-connection area is a potential entry port for micro-organisms which have direct influence on the state of the peri-implant hard and soft tissue and consequently on the long-term prosthetic and implant success [8]. By using an abutment as a connector between implant and supra-structure implies the generation of one more micro-gap (between supra-structure and abutment) and possible retention of microbial plaque though located above the hard tissue level.