Dentistry – Prosthodontics – Holding or positioning denture in mouth
Patent
1997-03-27
1998-07-28
Wilson, John J.
Dentistry
Prosthodontics
Holding or positioning denture in mouth
433172, A61C 800
Patent
active
057855242
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF INVENTION
The invention concerns a securing device for dental implants.
A securing device of this type is known from Canadian Patent 1,313,597 (FIG. 6).
With this design, the screw connection for securing a crown or bridge on the implant body is designed in two parts. One part forms a screw that can be screwed with its threaded shaft into a central threaded hole drilled in the implant body and it also has a bent thread-free cylindrical shaft part onto which a sleeve-like socket can be placed to secure it. With a peripheral face part that tapers conically toward the bottom, the cylindrical shaft part is supported on a complementary inside ring-shaped shoulder of the securing socket, so the socket and the implant body can be secured together axially.
Between the two parts there is a ring gasket whose lower ring face receives a concentric ring-shaped sealing edge that is provided on the upper ring face of the implant body so as to form a seal.
Another seal is provided in the form of a ring gasket that is inserted in a peripheral groove of the cylindrical shaft part of the connecting screw and is supported on the inside circumference of the sleeve-like securing socket.
The other part of the screw connection is formed by an anchoring screw that can be screwed with its threaded shaft into a central threaded hole in the cylindrical shaft part of the connecting screw. The anchoring screw serves to axially secure a receptacle part for a dental prosthesis in the form of a crown or a bridge, which also forms the upper cap part of the sleeve-like securing socket.
Therefore, the anchoring screw has a screw head that tapers conically toward the lower end and is supported on the inside peripheral part of a central cylindrical drilling in the receptacle part with a matching conical taper.
The receptacle part in turn sits securely in a crown or bridge that can be secured on the socket base by tightening the anchoring screw.
The arrangement of the sealing devices explained here (O ring; ring gasket and sealing edge) prevents the seepage of oral fluids that might lead to an infection into the implant body.
The type of seal described here is formed by the multi-part and thus expensive design of this securing device.
SUMMARY OF INVENTION
The object of this invention is to provide a securing device that will assure a tight reliable seating of crowns or bridges on post-like implant bodies without requiring any additional special sealing elements.
Due to the fact that the ring-shaped faces of the screw head and the implant body are each provided with a ring-shaped sealing edge, a form-fitting mutual meshing of these ring-shaped faces with a crown or bridge is achieved because when the securing screw is tightened it produces a high surface pressure leading to plastic deformation of the ring-shaped face of the crown or bridge supported on the respective sealing edge. This levels out the pits and cavities remaining between the ring-shaped faces that are to be tightened to each other. Accordingly, this yields a connection of the parts joined that remains absolutely tight over a period of time.
This invention makes it possible to attach a crown or a bridge directly to the implant body without having to use any additional sealing agents and thus it greatly simplifies the overall design.
German Utility Patent 8,905,497.0 has already disclosed a securing device for dental implants having a shell-like prosthesis anchoring device that can be screwed onto an implant body to be implanted in the jawbone. On its lower ring-shaped face which has a threaded shaft, the prosthesis anchoring device has a concentric collar with a peripheral face that tapers conically toward the outside.
When the anchoring device is screwed in place, however, it does not sit on an inside ring-shaped shoulder of the crown or bridge as in the invention but instead it rests on the implant body itself.
The ring-shaped sealing edges provided according to this invention can be designed as part of the corresponding part by turning it on a lathe or by some
REFERENCES:
patent: 5302126 (1994-04-01), Wimmer et al.
patent: 5447434 (1995-09-01), Shaw
Metaux Precieux SA Metalor
Wilson John J.
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