A dental abutment assembly that comprises a dental abutment having a tubular passage with an internal abutment thread at a lower end of the tubular passage a dental implant fixture having an upper socket with an internal implant fixture thread and a screw shaft having an upper external thread with an upper external helix twisted in a first direction and a lower external thread having a lower external helix twisted in a second direction the upper external thread and the lower external thread are located at opposite ends of a connecting shaft. The first direction and the second direction are opposite to one another.
