An implant system including: an insertion part including a screw part and neck part including a recess in a neck end face thereof for fixing an abutment and, distanced from the neck end face, projections； an insertion instrument screwing down the insertion part, and including a handle part and socket part having a socket end face including an opening and at least a driving part laterally bounded by walls, which driving part has a cross-section at right angles to the longitudinal axis, to accommodate the neck part and transfer tightening torque to the insertion part through the projections, the opening including a bridge part contiguous to the driving part and enclosing the neck part, situated next to the projections and extending to the neck end face, to form an interspace between the bridge part and the neck part, when the driving part embraces the projections of the neck part.
