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Orthodontic screw-type implant

Orthodontic screw-type implant description/claims

The invention relates to an orthodontic screw implant comprising an elongated body, which has a thread for anchoring in a jaw bone and carries a polygon head having on an end face two slots which cross in a recess.

Such screw implants have a head with a cross-shaped recess to which can be anchored an apparatus for a dental misalignment correction. An archwire that can exert pressure for the teeth misalignment correction is placed in the cross recession. Customarily, the archwire is additionally guided by one or more brackets that are bonded to the teeth.

It is an object of the invention to provide an orthodontic screw implant that facilitates the treatment of teeth misalignments both for patients and orthodontist.

This object is attained by a screw implant with the features set forth in claim 1. Other advantageous embodiments are the object of dependent claims.

The central recess of a screw implant according to the invention avoids sharp edges in the crossing slots. Thus, a wire can be bent with a larger bending radius which requires less force for insertion in the crossing slots, thus facilitating the orthodontist's job. Further, within the scope of the invention it was found that, because of the preventing of a sharp kink, considerable less pressure is placed on the wire. The use of a screw implant according to the invention for the inserting of a bent wire in the slots crossing in the recess, particularly bent at a 90° angle, has therefore a positive effect on the lasting durability of the wire.

In order to remove the sharp edges of crossing slots a central milling can be effectuated, for example, which results in a cylindrical recess from which extend the four partial slots. Between the partial slots are convex bent lateral faces of the recess.

Preferably, the slots have a width that is less than two thirds, especially preferable one half or less, of the distance between the opposite lateral faces of the recess. In such a manner, it is possible to attain that a wire in the cross-shaped recess can be bent with a greater radius, therefore being under less stress. Thus, the danger of a breaking wire is reduced.

Preferably, the recess has a diameter of at least 1 mm. The width of the slots is preferably 0.45 mm to 0.6 mm, especially 0.5 mm to 0.6 mm.

The invention will be described in further details and advantages with reference to an embodiment shown in the accompanying drawings, wherein

FIG. 1 shows greatly enlarged a lateral view of an orthodontic screw implant

FIG. 2 shows the same anchor screw in a lateral view, rotated 90° with respect to FIG. 1

FIG. 3 shows the cross-section A-A through the screw according to FIG. 1, and

FIG. 4 shows a top view of the head of the anchor screw according to FIG. 1

FIGS. 1 to 4 illustrate the embodiment of an anchor screw of an orthodontic screw implant. The anchor screw has an elongated body with a thread 10 for the anchoring into a jaw bone, provided with two crossing slots 3 on an end face intended to protrude from the jaw bone. The slots are made for the inserting of an archwire. The end face with the crossing-slots 3 is arranged on a head 1 of the anchor screw, which head is configured as a hexagon 2 for the gripping of a wrench. Other embodiments that enable a torque transmission by means of a positive locking are also possible such as, e.g., an octagon, generally an outer polygon.

• Provisional Patent
• Utility Patent

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