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

An endosseous implant anchor 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) said anchor having an inverted core open at its lower end and peripherally perforated, said anchor core being adapted to encompass 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.

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.

An endosseous implant anchor 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) said anchor having an inverted core open at its lower end peripherally perforated, said anchor core being adapted to encompass said bone core;
• (b) said anchor having a plurality of turns of screw threads adapted to engage the wall of said bone recess;
• (c) said anchor having a substantially cylindrical neck portion above said screw threads having a diameter not greater than the inside diameter of said screw threads and of a length sufficient to project just above the bone crest;
• (d) said anchor neck having means cooperable with a tool by the aid of which said anchor is threaded into said bone recess;
• (e) said anchor neck having an upwardly opening recess for placement of a companion part.