Retention die and dental implant system

A dental implant system, comprising

• an abutment having an end side;
• and
• an apparatus for releasable attachment of a removable dental prosthesis that can be attached to the abutment comprising
• (a) a retention matrix having a receptacle and a center axis;
• and
• (b) a circular-ring-shaped retainer element accommodated in the receptacle having at least first and second clamping arms and displaceable along the center axis of the retention matrix;
• wherein the retainer element has an outside thread that engages into an inside thread disposed in the receptacle, wherein rotation of the outside thread moves the retainer element along the center axis of the retention matrix;
• wherein the first and second clamping arms form an outwardly flared conical surface area;
• wherein the receptacle has first and second sections having different first and second inside diameters, respectively, and a transition between the first and second sections;
• wherein the first and second sections are positioned at a distance to the inside thread;
• wherein the first and second clamping arms lie against the transition;
• wherein a head part having an outer contour is formed onto the end side of the abutment;
• wherein the head part has a cylindrical section having an end making a transition into a diameter-widened circumferentially rounded section, whereby an undercut is formed, wherein the clamping arms have an indentation corresponding to the outer contour of the head part,
• wherein the clamping arms engage behind the undercut in an installed state of the retention matrix.