Dental prosthesis stabilizer

Details Dental prosthesis stabilizer Dental prosthesis stabilizer

2000-04-18

2001-10-23

Wilson, John J. (Department: 3732)

Dentistry

Prosthodontics

Holding or positioning denture in mouth

Reexamination Certificate

active

06305940

ABSTRACT:

BACKGROUND OF THE INVENTION
A) Field of the Invention
The present invention concerns a dental prosthesis stabilizer, in particular a device which makes it possible to stabilize an upper prosthesis and a lower prosthesis in relation to one another.
In particular, the invention concerns a dental prosthesis stabilizer which makes sure that the upper prosthesis remains pressed against the upper jaw, and the lower prosthesis against the lower jaw when the mouth is opened.
B) Discussion of the Related Art
Connections between an upper prosthesis and a lower prosthesis which are equipped with a spring so as to keep the upper prosthesis and the lower prosthesis pressed against the respective jaws when the mouth is opened have already been long known.
Such connections between an upper and a lower prosthesis are described among others in Belgian patent No. 1,006,478 and in British patent No. 784,540.
However, the known connections between either an upper prosthesis and a lower prosthesis, or between an upper prosthesis or a lower prosthesis and the natural teeth have as a major disadvantage that they cannot follow the natural movements of the jaws, as a result of which the prosthesis does not fit up well to the respective jaw when the mouth is opened.
The maxillary joint is indeed situated above and behind the oral cavity, whereas the hinge of a mutual connection between prostheses or between a prosthesis and the natural teeth is necessarily situated in the oral cavity.
As the maxillary joint on the one hand and the above-mentioned connection on the other hand hinge in different places, this has for a result that the prostheses, when the mouth is being opened, make a turning movement having another middle point than that of the respective jaw.
This results in that, when the mouth is opened, the prosthesis will still fit up to the respective jaw in the front of the oral cavity, but this will certainly not be the case in the back of the oral cavity.
SUMMARY OF THE INVENTION
The invention aims a dental prosthesis stabilizer which has been improved in several respects compared to the existing connections of dental prostheses.
In particular, the invention aims a dental prosthesis stabilizer whereby the above-mentioned disadvantage and other disadvantages of the known connections between dental prostheses are excluded or are at least minimized.
To this aim, the invention concerns a dental prosthesis stabilizer, consisting of at least two arms, connected to one another by means of a hinged joint which is equipped with a spring, provided with junctures in order to fix them to a prosthesis, whereby at least one of these arms can be extended.
Preferably, the arm, which is connected to the upper prosthesis, can be extended, to which end said arm is equipped with telescopic parts which slide into one another, in between which is situated a helicoidal compression spring.
According to a preferred embodiment, the arm is provided with a ball, and the upper prosthesis is provided with a cavity, such that the ball forms a snap connection together with the cavity.
The hinged joint between the arms of the dental prosthesis stabilizer may consist of disc-shaped parts of the above-mentioned arms, in between which is situated a torsion spring, and whereby these disc-shaped parts are connected to one another by means of a bayonet catch.
The arm of the dental prosthesis stabilizer which is connected to the lower prosthesis is preferably provided with a knob-shaped protrusion, and the lower prosthesis is preferably provided with a slot in which said knob-shaped protrusion can be provided and can slide into.


REFERENCES:
patent: 5181 (1847-07-01), Stuart
patent: 2224511 (1940-12-01), Cleven
patent: 4382783 (1983-05-01), Rosenberg
patent: 5562445 (1996-10-01), DeVincenzo et al.
patent: 5980247 (1999-11-01), Cleary
patent: 1 006 478 (1994-09-01), None
patent: 195 46 960 (1996-06-01), None
patent: 887 914 (1943-11-01), None
patent: 784 540 (1957-10-01), None

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