Dentistry – Prosthodontics – Holding or positioning denture in mouth
Patent
1997-09-02
1998-11-17
Wilson, John J.
Dentistry
Prosthodontics
Holding or positioning denture in mouth
433 8, 433 24, 433172, A61C 800
Patent
active
058367683
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a fastening device on a single-piece or multi-piece dental implant, which is fitted in the jaw bone, for the fixing of orthodontic apparatuses and the subsequent use of the implant as a support for a crown or another superstructure, and with the implant head, or the transmucosal unit applied thereon, protruding from the soft tissue.
The purpose of orthodontic apparatuses is to correct congenital or acquired malpositioning of the teeth. Orthodontic is arch wires fastened on brackets are often used for moving the teeth which are in need of correction. The torsional and/or bending stress of such a wire is utilized as a means of exerting a force on the teeth which are to be moved. The wire extends between an attachment point, which is positioned in as stable a manner as possible, and the tooth which is to be corrected, or a group of teeth. The attachment point can either consist of a plurality of teeth taken together to form a block, or of an inserted implant. This invention concerns the latter alternative.
PRIOR ART
The brackets are either bonded directly onto the enamel of the teeth which are to be moved, using a suitable special adhesive, or else the brackets are soldered onto a closed metal band which is prepared from an impression and which is cemented firmly around the tooth. At one end, the orthodontic wire is fastened in this bracket, and, at the other end, the wire is supported on an implant. This implant could be an implant designed purely for orthodontic treatment, as is described in PCT patent application no. WO 96/12451. An implant of this type has a clamp cap which can be screwed on and fixed in any position and which has a peripheral guide slot for receiving the wire. After the positioning of the teeth has been corrected, this purely orthodontic implant is then removed. However, it is also possible to use, as the attachment point, implants which have a dual function, that is to say, in the first instance, of fixing an orthodontic wire, and, in the second instance, of acting as a support for a crown or another superstructure. In order to increase the force acting on the teeth which are to be moved, the arch wires are in most cases combined with traction or compression springs or with elastic bands.
The invention relates especially to a fastening device for fixing an orthodontic apparatus on a bifunctional dental implant. Hitherto, a provisional, individual or prefabricated crown has been applied on the implant when correction of a malpositioning of the teeth is first envisaged. A bracket for receiving the orthodontic wire is fastened on the temporary crown (see U.S. Pat. No. 5,232,364). This procedure has several drawbacks. A costly feature in the first place is that a provisional crown has to be fitted at all. Providing a bracket means that it subsequently has to be pulled off again, and in so doing each crown is damaged to the extent that it can no longer be used. When using a specific provisional crown, the subsequent choice of the wire shapes is restricted, since a wire joint of specific contour is often worked into crowns of this type. A trimming of the provisional crown is also ruled out because of the wire joints. In most cases, the dentist will also bond the bracket itself onto the provisional crown already in place in the mouth, and will not be able to fit a crown which has already been equipped with a bracket by the dental technician. As a consequence, the patient and the dentist are caused further inconvenience. The required readjustment of the apparatus located in the mouth of the patient necessitates considerable effort during ortho-dontic treatment. Finally, the provisional crown, which has been damaged by the bracket being pulled off after the mal-positioning has been corrected, has to be removed in its entirety from the implant in order subsequently to apply the final crown or the intended superstructure onto the implant. All in all, this procedure entails considerable costs, and other conventional apparatuses are in some cases just as unsatisfactory be
REFERENCES:
patent: 4988292 (1991-01-01), Rosen
patent: 5015186 (1991-05-01), Detsch
patent: 5071345 (1991-12-01), Rosen
patent: 5082442 (1992-01-01), Rosen
patent: 5205745 (1993-04-01), Kamiya et al.
patent: 5232364 (1993-08-01), Rosen
Glatzmaier Jurgen
Huskens Christoph
Mundwiler Ulrich
Institut Straumann AG
Wilson John J.
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