One aspect of the invention concerns an overdenture retention implant (10) comprising an externally threaded implant body (12) to be screwed into a hole formed in a jawbone (70) and an implant end structure (14) at a proximal end of the implant body. The implant end structure includes a tool engagement portion (14.1) that can be engaged by an implant installation apparatus operable to rotate the implant to screw the body into the hole, and a threaded boss (14.2) to be engaged in threaded manner by an overdenture retention cap (100) configured for attachment of an overdenture. The tool engagement portion and boss have a common, central axis (22) which intersects the central axis (20) of the implant body at an acute angle (24). Other aspects of the invention concern the combination of the implant (10) and installation apparatus and the installation apparatus itself.
