Dentistry – Orthodontics – By device having means to apply outwardly directed force
Patent
1983-03-14
1984-11-13
Wilson, John J.
Dentistry
Orthodontics
By device having means to apply outwardly directed force
A61C 300
Patent
active
044823185
ABSTRACT:
This invention relates to an orthodontic spreader, particularly for correcting the positions of molars in the upper jaw, and comprises pressure-transmitting nuts for applying force at points which are as close as possible to the center of resistance. The spreader is capable of applying a high pressure and has a large spreading capacity and is as convenient as possible for the patient. The actuating screw for moving the pressure-transmitting nuts in opposite directions comprises an actuating portion, which is disposed between said pressure-transmitting nuts. Guide rods are slidably mounted in both pressure-transmitting nuts and carry stops which axially restrain said guide rods.
REFERENCES:
patent: 3800420 (1974-04-01), Ouaknine
patent: 3835540 (1974-09-01), Biederman
patent: 3921294 (1975-11-01), Wallshein
patent: 4045871 (1977-09-01), Nelson
patent: 4107843 (1978-08-01), Spino et al.
patent: 4347054 (1982-08-01), Kraus et al.
patent: 4379693 (1983-04-01), Wallshein
Bernhard Forster GmbH
Wilson John J.
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