Artificial dental prosthesis

Claim 1

A crown attachment comprising: an implant adapted to be seated in a bone of a jaw and having an attachment end turned away from said bone and having an axis; a first coupling member fixed to said end of said implant and provided with an annular first formation located along said axis and surrounded by an annular shoulder lying in a plane generally perpendicular to said axis; a second coupling member formed centrally with a second formation matingly engageable with said first formation with freedom of swivelling and axial mobility therebetween, and with an annular shoulder surrounding said second formation and lying in a plane and juxtaposed with said shoulder of said first coupling member, said shoulders being each formed with a respective groove opening toward the other shoulder and registering with one another; a dental crown affixed to said second coupling member; and an elastic ring disposed in said grooves and of a material and so associated with the shapes of said grooves as to yieldably resist displacement of said shoulders toward one another with a force/displacement characteristic having a break between an initial section of greater yieldability and an adjacent subsequent section of lesser yieldability.