Expansion screw for tooth adjustment

Details Expansion screw for tooth adjustment Expansion screw for tooth adjustment

1994-02-02

1995-12-05

Lucchesi, Nicholas D.

Dentistry

Orthodontics

By device having means to apply outwardly directed force

A61C 700

Patent

active

054723442

DESCRIPTION:

BRIEF SUMMARY
FIELD OF THE INVENTION

The invention relates to an expansion screw for tooth adjustment having two expansion screw body members each embeddable in a plastic palate plate, these body members being provided with retention means for anchoring in the plastic of these palate plates, also having a threaded spindle and at least one guide pin, wherein the threaded spindle has spindle sections with opposite threads on either side of a central section provided with a point of attachment for a tool for turning the threaded spindle, these spindle sections engaging in channels provided with corresponding internal threads in the expansion screw body members for altering the distance of the two expansion screw body members from one another, and wherein the expansion screw body members have guide openings for the passage of the guide pin extending parallel to the threaded spindle.


BACKGROUND OF THE INVENTION

There are two current types of expansion screws with which the forces exerted by the expansion screw are to be transferred in various ways onto the tooth or teeth, the position of which is intended to be corrected: In expansion screws of a first type, the relevant expansion screw is embedded in a palate plate cast from casting resin and divides the palate plate into two parts such that one of the two expansion screw body members of the expansion screw is located in each palate plate part and so the distance of the two palate plate parts from one another can be altered by turning the threaded spindle of the expansion screw. During the casting of the palate plate, for example, clasp-like anchoring elements are secured therein and these elements engage on teeth so that the forces of the expansion screw are transferred to the relevant teeth via the palate plate parts. Such an expansion screw of this type is, for example, illustrated in FIG. 3 of DE-PS 33 01 753. With the second type of expansion screw, two rods or stiff wires are secured, in particular welded, to each of the two expansion screw body members and the relevant expansion screw body member can be anchored by these rods or wires directly onto metal bands secured to the teeth. An expansion screw of this type is illustrated, for example, in FIG. 2 of U.S. Pat. No. 4,917,601.
When in the above or in the following mention is made of a tooth adjustment or of the correction of the position of a tooth or several teeth, this is to be understood as also including, for example, the separation of the mid-palatal suture since a mid-palatal suture separation also results, of course, in an alteration of the tooth position.


SUMMARY OF THE INVENTION

As expressed at the outset, the present invention deals with expansion screws of the first type, i.e. with expansion screws which are used in conjunction with a plastic palate plate, during the production of which the two expansion screw body members are embedded in the casting resin of the palate plate.
An expansion screw of the type specified at the outset is known; this known expansion screw corresponds to that according to DE-PS 33 01 753 but is provided with retention means in the form of short, straight grooves which--in the side view of the expansion screw--are arranged in front of and behind the threaded spindle as well as at the outer narrow sides of the two expansion screw body members.
This known expansion screw has two guide pins arranged on either side of the threaded spindle and these pins are guided for displacement in guide openings of both expansion screw body members. The latter have a rectangular cross section along the plane defined by the longitudinal central axes of the threaded spindle and guide pins, and the central section of the threaded spindle has the shape of a thickened, circular-cylindrical collar (spindle head) with a transverse bore for the insertion of a pivot pin, with which the threaded spindle can be turned. The guide openings of the two expansion screw body members each have the shape of a recessed bore, the first section of which facing the spindle head has a diameter corresponding to t

REFERENCES:
patent: 4347054 (1982-08-01), Kraus et al.
patent: 4482318 (1984-11-01), Forster
patent: 4571177 (1986-02-01), Dahan
patent: 4917601 (1990-04-01), Williams

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