Dental implant

Claim 1

An implant for anchoring a dental prosthesis comprising: an elongated primary implant member formed along an exterior thereof with means for seating said primary implant member in a jaw bone of a patient to be fitted with a dental prosthesis, said primary implant member being provided with: a recess open at one end thereof, said recess being formed with a mouth formed as a frustoconical surface at said one end and with an annular shoulder spaced axially from said on end, and a bore extending axially from said annular shoulder toward an end of said primary implant member opposite said one end and having an internal thread; an elongated secondary implant member formed with a respective frustoconical surface an a received with radial play in said recess, so that said frustoconical surfaces of the mouth and second implant member are complementary to one another, said second implant member having a portion outside said recess for receiving said dental prosthesis and being formed with a longitudinal thoroughgoing opening; at least one elastic O-ring between said members bridging radial play between them and holding said frustoconical surfaces in spaced-apart relationship; keying means of said members securing said secondary implant member against rotation relative to said primary implant member while enabling said secondary member to slide axially in said primary implant member; and a screw received in said opening of said secondary implant member and having a head formed with a formation for receiving a driving tool, a threaded shank threadedly engaging said internal thread of said bore, an abutment engageable with said shoulder upon screwing of the screw into said thread, and a stop surface of said head on a threaded shank side thereof engageable with a countersurface of said secondary member for preventing said secondary member from withdrawing from said primary member, bracing said secondary member against said O-ring in said primary member, and limiting axial play of said secondary member to movement against said O-ring into said primary member.