Dentistry – Orthodontics – Means to transmit or apply force to tooth
Patent
1992-12-21
1995-01-03
Wilson, John J.
Dentistry
Orthodontics
Means to transmit or apply force to tooth
433 18, A61C 300
Patent
active
053781473
DESCRIPTION:
BRIEF SUMMARY
The invention relates to an apparatus for displacing the lower jaw forward, consisting of a telescoping sliding device with a telescope source, which, via a ball-and-socket joint, is connected with a first anchoring band for anchoring on the teeth of a jaw, and with a telescope sleeve, which, via a second ball-and-socket joint, is connected with a second anchoring band for anchoring on the teeth of the counterjaw.
Such ventral telescopes are known, for example from U.S. Pat. No. 3,798,773. For purposes of displacing the lower jaw forward, they are incorporated in the known way in the mouth of the patient orally or vestibularly on the left and right sides. For this purpose, the anchoring bands are fastened on suitable teeth or groups of teeth of the upper and lower jaws. The known ventral telescopes of the above type, because of the ball-and-socket joints used, have the advantage that the lower jaw retains a certain freedom of movement relative to the upper jaw also laterally. However, the known ventral telescopes of the specified type have the drawback that the ball-and-socket joints used therewith can transmit at the end of the telescoping sliding device only pressure forces, but not also tensile forces. So that the balls will not detach themselves from the ball sockets at an inappropriate time, the telescoping sliding device of the known apparatuses is always loaded by a pressure spring disposed interior of the sliding device, which spring always generates a force acting in the extension sense. Said force always presses the balls of the ball-and-socket joints into the associated ball sockets.
However, said continuously acting force, which stresses the jaws of the patient in the opening sense, is often not desired under the medical aspect. It is better from the medical viewpoint if the telescoping sliding device of the ventral telescope only guides the lower jaw relative to the upper jaw along a desired path of movement, but not always exerts a force on the jaws in the opening sense.
With an embodiment of the ball-and-socket joints that is resistant to pressure and tension, mounting and removal of the telescoping sliding device, for example for the purpose of adjustment of the length, or for cleaning and disinfecting by the treating physician is made decisively more difficult. Therefore, due to the difficult mounting and removal, there is the danger of iatrogenic damage in the zone of the corners of the mouth of the patients.
It is, therefore, the problem of the invention to further develop the apparatus of the type specified above in that the ball-and-socket joints at the ends of the telescoping sliding device are embodied with resistance to tension and pressure, but nevertheless mountable and removable by the treating physician in the simplest way.
For resolving said problem, the invention proposes based on the apparatus of the type specified above that the ball insertion openings of the ball sockets of ball-and-socket joints are aligned substantially perpendicular to the longitudinal extension of the telescope source, or telescope sleeve, and that the ball head of each ball-and-socket joint is snappable into the associated ball socket under elastic deformation of a safety means.
The apparatus according to the invention has the advantage that the ball-and-socket joints are both resistant to pressure and sufficiently resistant to tension. Because of the special alignment of the ball insertion openings of the ball sockets of the ball-and-socket joints, tensile forces in the longitudinal direction of the telescoping sliding device practically cannot pull the ball heads from the associated ball sockets. In spite of the largely tension-resistant embodiment in the longitudinal direction of the telescoping sliding device, the ball-and-socket joints can be easily mounted and removed by the treating physician with the help of a suitable instrument, namely without stressing the teeth and the anchoring bands in any excessive way, or without damaging the corners of the mouth of the patients.
According to a first em
REFERENCES:
patent: 3618214 (1971-11-01), Armstrong
patent: 3798773 (1974-03-01), Northcutt
patent: 4382783 (1983-05-01), Rosenberg
Article by Hans Pancherz entitled "Herbst's Hinge" (Das Herbst'sche Scharnier) published by Lunds University, Malmo, Sweden-1983.
Hartmann H. Michael
Wilson John J.
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