The invention relates to a screw implant (1) for a jaw bone with coronal compression thread (4) with thread filaments (lla-llj) and apical self-cutting thread (6) with threaded helices (16a, 16b), the thread pitches are about the same, wherein below to a coronal implant head (2) in apical direction a compression thread (4) is following, this thread being positioned spongious bone substance. Below this, a cutting thread (6) to the end position in the apical cortical bone substance is following. Both the core diameter and the outer diameter of the compression screw thread (4) are tapered at least in the apical region, becoming thinner towards apical. The invention is characterized in that the axial length of the compression thread (4) equals approximately the 2.5-15fold +- 25% of the axial length of the cutting thread (6), and in that the radial thread depth (14) of the cutting thread is 1.5 fold +- 25% of the ccompression thread, and that the wedge angle (P) of the thread spirals (1 la-1 Ij) of the compression screw thread (4) is greater, than the wedge angle (a) of the thread spirals (16a, 16b) of the cutting thread (6), preferably 1.5x + / - 25%.
