Enossal implant for a firmly seated tooth replacement

Claim 1

In an enossal implant for a firmly seated tooth replacement having a fastening device including a fastening head on a metal implant post which is threadably connected in a threaded bore of a base element, which is selected from a base body having a threaded bore and a metal spacer having a threaded bore and being threadably received in the threaded bore of the base body to extend from one end of the base body, the implant post being zonally concentrically surrounded close to the distal edge of the base element by an intermediate element made from an elastic plastic material, the improvements comprising means for resisting twisting between the implant post and the base element, said means including the intermediate element being a cylindrical retaining ring with substantially planar smooth end faces, said base element, adjacent an open end of the threaded bore, having an annular recess for receiving the retaining ring, said recess being provided with a stop shoulder for engaging one of the faces of the retaining ring as it is received in the recess, said recess having an axial extension less than the length of the retaining ring, said implant post having a ring shoulder engaging the other of the end faces of the ring, and interlocking depressions being provided in one of the recess and the ring shoulder so that as the implant post is threaded into the base element, the material of the retaining ring is deformed under the compression to cause formation of a positive twist resistance between the retaining ring, base element and implant post.