Dentistry – Orthodontics – By device having means to apply outwardly directed force
Patent
1989-02-02
1990-04-17
Wilson, John J.
Dentistry
Orthodontics
By device having means to apply outwardly directed force
A61C 300
Patent
active
049176013
ABSTRACT:
An orthodontic expansion screw appliance for being secured to first and second areas of a patient's teeth. The appliance includes a first screw body attached relative to the first area of the patient's teeth; a second screw body attached relative to the second area of the patient's teeth; a screw spindle having a threaded first end for being screwed to the first screw body and having a threaded second end for being screwed to the second screw body; rotation of the screw spindle causing the first and second screw bodies to move relative to one another; and fill structure coating the threaded first and second ends of the screw splindle for preventing the externally threaded first and second ends of the screw spindle from inadvertently rotating relative to the screw bodies.
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patent: 3069387 (1962-12-01), Allen et al.
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patent: 4347054 (1982-08-01), Kraus et al.
patent: 4354832 (1982-10-01), Wallshein
patent: 4482318 (1984-11-01), Forster
patent: 4576847 (1986-03-01), Tajima
Lepiane Adriene J.
Professional Learning Programs, Inc.
Wilson John J.
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