Orthodontic screw-type device and method of making same

Details Orthodontic screw-type device and method of making same Orthodontic screw-type device and method of making same

1979-06-04

1980-11-04

Peshock, Robert

Dentistry

Orthodontics

By mouthpiece-type retainer

A61C 700

Patent

active

042317363

ABSTRACT:
An orthodontic screw-type biassing device comprises: a first member having an internally threaded bore, the threaded bore comprising first and second threaded portions adjacent each other in the axial direction of the bore, the first and second threaded portions having thread roots which lie substantially on a common line, the first threaded portion having threads of given depth and the second threaded portion having threads of a lesser depth. A threaded inner screw-type member is threadably engaged in the internally threaded bore of the member, the threads at an end portion of the inner screw member being deformed so as to freely, threadably pass through the second threaded portion of the threaded bore and to bind and be non-rotatable in the first threaded portion of said threaded bore. The invention is also directed to a method of making such a biassing device.

REFERENCES:
patent: 3832778 (1974-09-01), Wallshein
patent: 4107843 (1978-08-01), Speno et al.

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