Dentistry – Prosthodontics – Holding or positioning denture in mouth
Reexamination Certificate
1998-01-23
2001-05-08
Wilson, John J. (Department: 3732)
Dentistry
Prosthodontics
Holding or positioning denture in mouth
C433S173000
Reexamination Certificate
active
06227856
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates generally to abutment and coping systems for use with dental implants to assist in the mounting and positioning of prostheses on the implant. This invention particularly relates to such abutment and coping systems that can be used in the restoration of a single tooth.
SUMMARY OF THE INVENTION
A primary object of this invention is to provide an improved abutment that permits a healing cap and/or an impression coping to be attached to the abutment by means of a screw that threads into the proximal end of the abutment.
Another object of this invention is to provide an abutment and coping system that (1) can be easily and efficiently made in a variety of different diameters and lengths, (2) permits the use of a common abutment post, in any given installation, to successively receive a healing cap, an impression coping and a prosthesis coping, and (3) permits the prosthesis coping to be attached to the abutment post with dental cement while being precisely centered on the abutment post and mechanically locked against substantial rotational movement relative to the abutment post.
A further object of this invention is to provide such an improved abutment and coping system that permits the prosthesis coping to be cemented to the abutment post while maintaining a precise coaxial relationship between the abutment and the coping.
Yet another object of the invention is to provide such an improved abutment and coping system that permits limited angular displacement of the prosthesis on the abutment, before the cement has cured, while maintaining a precise coaxial relationship between the prosthesis and the abutment.
Other objects and advantages of the invention will be apparent from the following detailed description and the accompanying drawings.
In accordance with the present invention, the foregoing objectives are realized by providing an improved dental abutment comprising an abutment post having a transmucosal base portion and a supragingival portion having a smaller transverse external cross-section than the proximal end of the base portion, the supragingival portion forming a through bore threaded at its proximal end and stepped to form an internal shoulder for seating the head of a screw for attaching the abutment post to the implant. The exterior surface of the abutment post preferably forms a generally polygonal transverse cross-section for receiving hollow components having interior surfaces that can be telescoped over the abutment post.
The abutment post is used in an abutment system that includes a healing cap, an impression coping and/or a prosthesis coping forming an interior surface that can be telescoped over the supragingival portion of the abutment post. At least a portion of the interior surfaces of the copings preferably forms a generally polygonal transverse cross-section with concave regions between the corners of the polygon for receiving dental cement for bonding the coping to the abutment post. The healing cap and/or the impression coping is preferably attached to the abutment by a screw that threads into the proximal end of the through bore in the abutment post. The opposed surfaces of the abutment post and the coping preferably have truncated corners that are very close to each other to maintain a coaxial relationship between the post and the coping, while the portions of the opposed surfaces adjacent to the truncated corners are spaced farther apart to permit limited angular movement of the post and coping relative to each other and to permit the entry of dental cement between the opposed surfaces.
REFERENCES:
patent: 5125841 (1992-06-01), Carlsson et al.
patent: 5154612 (1992-10-01), Carlsson et al.
patent: 5376004 (1994-12-01), Mena
patent: 5417568 (1995-05-01), Giglio
patent: 5476382 (1995-12-01), Daftary
patent: 5564924 (1996-10-01), Kwan
patent: 90 02 824 (1990-10-01), None
Product Catalog Prosthetics 1991, Brånemark System, Nobelpharma.
Guidelines Wide Platform, Brånemark System, 1996.
Beaty Keith D.
Rogers Dan Paul
Implant Innovations, Inc.
Jenkens & Gilchrist
Wilson John J.
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