Expansion screw for orthodontics
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Nov 2, 1999
Grant Date -
N/A
app pub date -
Mar 9, 1998
filing date -
Apr 2, 1997
priority date (Note) -
Expired
status (Latency Note)
Importance
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.
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