Dentistry – Orthodontics – By device having means to apply outwardly directed force
Patent
1998-03-09
1999-11-02
Wilson, John J.
Dentistry
Orthodontics
By device having means to apply outwardly directed force
A61C 300
Patent
active
059758945
ABSTRACT:
Expansion screw for orthodontic plates or prothesis of synthetic resin, comprising at least one spindle (1) with at least a threaded portion (10), a block (3; 17) with through hole (31) for housing one part of the threaded portion (10) of spindle (1), guide means (2; 16) for moving each block (3; 17), means (11, 12) for actuating each spindle (1), wherein said hole (31) provided in each of said bodies (3; 17) has an inner diameter greater than the outer diameter of the corresponding threaded portion (10) of spindle (1) to allow for the interposition of a corresponding amount of resin in which a surface is cast of specular shape with respect to that of said threading and which takes up the form of the corresponding nut screw: each block (3) being integral with a corresponding element of the orthodontic plate or prothesis.
REFERENCES:
patent: 4107843 (1978-08-01), Spino et al.
patent: 4917601 (1990-04-01), Williams
patent: 5472344 (1995-12-01), Binder et al.
Leone S.p.A.
Wilson John J.
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