Endosseous dental implant system for overdenture retention, crown and bridge support

Claim 1

A two part endosseous implant designed to be secured at a recess prepared in the cancellous bone tissue of a subject, said recess having an outer part substantially in the form of a cylindrical hole, and having an inner part substantially in the form of a cylindrical kerf forming a bone core: (a) one of said implant parts comprising an anchor having an inverted core open at its lower end, and peripherally perforated, said inverted core being adapted to encompass a said bone core; (b) said anchor having a plurality of turns of self-tapping screw threads adapted to engage the wall of said bone recess; (c) said anchor having a cylindrical neck portion above said screw threads having a diameter approximating the inside diameter of said screw threads and of a length sufficient to project just above the bone crest; (d) said anchor neck having a non-circular socket cooperable with a tool by the aid of which said anchor is threaded into said bone recess; (e) the other of said parts comprising a pillar fitted into said anchor recess; (f) said pillar projecting just above the top of said anchor to form or to support a dental restoration or the like.

Claim 15

The method of fitting to the mouth of a subject, a dental implant anchor having an inverted hollow core, a plurality of turns of threads and a neck above the threads having a diameter at least approaching the root diameter of the threads, and a non-circular socket extending downwardly from the top of the anchor: (a) surveying by radiographic study the size of available jawbone structure; (b) determining the maximum recess depth for said anchor; (c) sizing both the top and bottom of the anchor as necessary in order to determine an anchor size in which the top of the anchor projects approximately a millimeter above the jawbone with the anchor threads at a position to be located beneath the crest of the jawbone; (d) forming a jawbone recess in at least two stages, the first stage comprising the formation of an upper cylindrical part of the jawbone recess to a depth determined by said survey, and the second stage comprising the formation of a cylindrical bone core beneath said upper recess part by an annular cut to a depth determined by said survey; (e) thereafter placing the sized anchor in the jawbone recess by rotating the anchor by means of a tool inserted in said non-circular socket.

Claim 16

The method of fitting to the mouth of a subject, a dental implant anchor having an inverted hollow core, a plurality of turns of threads and a neck above the threads having a diameter at least approaching the root diameter of the threads, and a non-circular socket extending downwardly from the top of the anchor: (a) surveying by radiographic study the size of available jawbone structure; (b) determining the maximum recess depth for said anchor; (c) sizing both the top and bottom of the anchor as necessary in order to determine an anchor size in which the top of the anchor projects approximately a millimeter above the jawbone with the anchor threads at a position to be located beneath the crest of the jawbone; (d) forming a jawbone recess in at least two stages, the first stage comprising the formation of an upper cylindrical part of the jawbone recess to a depth determined by said survey, and the second stage comprising the formation of a cylindrical bone core beneath said upper recess part by an annular cut to a depth determined by said survey; (e) thereafter placing the sized anchor in the jawbone recess by rotating the anchor by means of a tool inserted in said non-circular socket.