Patent ID: 8360775

Claim:
A wax model base for an abutment of a dental implant comprising: an engagement portion engaging with a locking portion for an abutment so as not to rotate, wherein the locking portion for an abutment is provided at an oral cavity inner side of a female screw provided along a center axis of an implant fixture analog embedded in a gypsum model reproducing an oral cavity in which an implant fixture is embedded in a jawbone at a lost tooth position; a truncated conical portion fitted into a conical portion which is provided on the oral cavity inner side of the locking portion for an abutment and expands outwardly toward the oral cavity inner side; a ring-like first stepped portion provided on the oral cavity inner side of the truncated conical portion; a conical building portion provided at the oral cavity inner side from an inner peripheral edge of the first stepped portion directly or through a cylindrical portion having a low height, so as to expand toward the oral cavity inner side; a cutoff portion provided on the outer peripheral surface at the oral cavity inner side of the building portion; a ring-like second stepped portion provided on the oral cavity inner side of the building portion; a cylindrical portion provided at the oral cavity inner side from an inner peripheral edge of the second stepped portion; and a screw hole provided penetrating along a center axis of the wax model base, and having a stepped portion formed at a middle position between a hole having a large diameter at the oral cavity inner side and a hole having a small diameter at the side opposite to the oral cavity inner side.