An abutment for mounting a restoration or crown to a dental implant, exhibiting
ability to retain the restoration thereon and to prevent rotation of the restoration
about the abutment. The abutment has a relatively wide base and a relatively slender
tapered projection. A stepped hole passes through the abutment for receiving a
screw which secures the abutment to the implant. The bottom of the stepped hole
is hexagonal, for cooperatively receiving a hexagonal post of the dental implant.
The base of the abutment has an inclined surface. The projection of the abutment
has negative taper such that it is wider away from the base than where it joins
the base. The projection has a groove formed therein, which groove extends along
the abutment in a path which for at least part of the circumference of the abutment
is neither purely horizontal nor purely vertical.
