line VI-VI according to FIG. 5; [0035]FIGS. 7a and 7 b are a plan view and sectional view respectively of the receiving element for the implant; [0036]FIG. 8 is a plan view of a second embodiment of a driving-in device according to the invention; and [0037]FIG. 9 is a perspective view of the driven-in implant according to FIG. 1 following its securing in the skull bone.