Dental implant abutment screw lock

A dental implant, comprising:

• a) an implant member configured for anchoring in a jaw bone and having an axial threaded bore therein,
• b) an abutment member having an axial bore therethrough, the bore being of reduced diameter at one end to form a shoulder, and at least one longitudinal locking groove in the wall of the axial bore extending to said shoulder,
• c) interengaging connector means on the implant member and abutment member for securing said members together against relative axial rotation,
• d) a coping screw having a threaded shank removably engaging the threaded bore in the implant member and an enlarged head removably engaging the abutment shoulder and securing the abutment member to the implant member, the coping screw also having a non-circular axial bore therein, and
• e) a locking member having a shank matching the non-circular shape of the axial bore in the coping screw for removable reception therein, the locking member having an enlarged head on the shank received freely in the axial bore of the abutment member, and at least one laterally extending locking key on said locking member head configured to slidably engage the at least one longitudinal locking groove in the abutment member, for securing the abutment member and coping screw against relative axial rotation.