Dentistry – Prosthodontics – Holding or positioning denture in mouth
Patent
1994-04-26
1995-05-23
Lucchesi, Nicholas D.
Dentistry
Prosthodontics
Holding or positioning denture in mouth
433174, 433177, A61C 800, A61C 1312, A61C 13225
Patent
active
054175690
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates to a multi-element dental implant for further grafting and anchoring of a dental prosthesis onto an osseous site. The invention includes the component parts of this implant as well as implant dentures made therefrom.
2. Discussion of Background Information
Dental implantology shows an increasing tendency leading to the use of multi-element implants that are composed of two separate elements, with the grafting thereof being successively effected. These multi-element implants are provided with an implantal stump composed of a tubular element which is anchored in the osseous site, and a suprastructure composed of an anchoring shank formed on the implantal stump and of a false stump that serves as a prosthesis base plate. Further, in implants such as the so-called normal implants, the false stump and the anchoring shank have collinear axes; whereas, in implants such as the so-called preangulated implants, the axes form an angle up to 20.degree..
First, the implant stump is anchored by screwing or any other way (DE 1,961,531, EP 0,114,955, or U.S. Pat. No. 3,708,883) in the osseous site, then the suprastructure is attached to the implantal stump by means of the anchoring shank so as to cause the false stump to take a suitable position. Actually, such anchoring in the implantal stump of the shank is achieved by two methods.
In one method the suprastructure shank is composed of a smooth bar, and is permanently sealed within the tubular implantal stump by using a cement. However, in this method, should clinical problems arise, then no removal of the suprastructure will not be possible.
In the other known anchoring method, the suprastructure shank is screwed into the implantal stump through conjugate threading and tapping as provided on these elements (See U.S. Pat. No. 3,589,011). In this method the suprastructure is releasable. However, positioning is inaccurate and hazardous, so much in the longitudinal direction (along the implant axis), because a determination, upon screwing, of the tightening stop limit proves difficult and relates to the orientation of the suprastructure about its axis, which is conditioned upon the final thread position. This angular inaccuracy forms a serious defect impairing preangulated implants, so that suitable positioning can hardly be made using this anchoring method.
SUMMARY OF THE INVENTION
The present invention intends to provide an improved multi-element implant, exempt from the above-mentioned defects. The invention aims at achieving accurate anchoring in the implantal stump (deep along the longitudinal axis and angularly about such axis) of the suprastructure while maintaining easy removal, if necessary.
Accordingly, the multi-element dental implant involved in the invention is of the type comprising a suprastructure provided with a false stump used as a prosthesis base plate and a shank for anchoring thereof, and a tubular implantal stump adapted to be anchored in the osseous site and to accommodate the suprastructure shank. In accordance with the present invention, the implant is characterized in that:
The suprastructure comprises a hollow core extending lengthwise therein, the hollow core opening at the free end of the false stump and being provided at the free end of the shank with a converging ramp, lengthwise therein from its free end so as to define several surface areas able to withstand radial expansion, series maintaining the balls in mutual contact, the latter thereof abutting against a cone-shaped ramp of the shank so as to be retained thereby, and to exert onto surface areas of the shank a spacing pressure, vicinity of the free end of the false stump, the screw abutting against the first ball so as to cause the series of balls to be moved and fixed.
Hence, in the implant of the invention, the tubular implantal stump which is of a type known per se, is anchored in the osseous site conventionally, such as by screwing or any other way already known. The suprastructure is anchored in this
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patent: 4609354 (1986-09-01), Koch
patent: 5030095 (1991-07-01), Niznick
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patent: 5133662 (1992-07-01), Metcalfe
International Search Report and Annex in French and English.
International Preliminary Examination Report in French.
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