Fig. (16) Periapical x-rays of cases #. 1 (a), #. 2 (b), #. 3 (c) and #. 4 (d) showing no pathological signs respectively on implant #. 1.6 after 6 years from the grafting procedure, on implant #. 1.6 after 3 years, on implant #. 2.6 after 4 years, and on implant #. 2.6 after 3 years. The gap visible between implants and abutments is due to the presence of a radiolucent shock adsorber considered by the used implant system.