DE3742568A1 - Bracket with shear key - Google Patents

Abstract

Improvement and new development in the design of so-called brackets within the orthodontic edgewise technique to "conical bracket".

Description

Due to the further development of the bracketherstell end industry has managed to use ceramics as a Base material next to the existing metals to introduce alloys. This material is intended to be a optical alternative to unsightly metal represent. Due to the special manufacturing process driving there are the following disadvantages:

• - very high hardness of the bracket
• - increased manufacturing tolerances due to the ceramic Baking process.

The patent application deals with this pro blem of the ceramic Edgewise application and the Removal of the maxillofacial surgical apparatus from the Tooth enamel at the end of the treatment period. By the tooth-like color and its hardness by using the ceramic brackets parts for the patient. On the one hand, it is in the optical appearance on the other hand in the day common use. However, they force relatively high costs per bracket require the user to do this to use multiple times. Due to the hardness of the material Ceramic and the attachment of the metallic, zylin drical shear wrench is very common Edge break (see drawing 1). A rework tion would be time-consuming and therefore cost-intensive. It is thus an improvement in the structural design A ceramic bracket is necessary to reduce the breakage rate to lower when shearing.

A major reason for destroying a Ceramic brackets is the manufacturing tolerance. the differing external dimensions do not allow an exact Fer the shear wrench.

Idea and solution

To these manufacturing tolerances of the external dimensions the outer edges of the bracket will be tapered manufactured (see picture 2). The conicity is so fine measure that it is optically invisible, but but the manufacturing tolerances. Through the It is modern NC-controlled machine tools become possible, the already determined flanks angle can also be produced in the shear wrench. so will place the shear wrench on the Konik bracket pushed until the cone is firmly seated on the work guaranteed (see picture 3). An "edging" and so that the selective attack of the shear forces ent falls. A key feature of this shear method is the shear key. The following important Features of this maxillofacial surgical tool distinguish:

• - metallic material
• - very high hardness and rigidity
• - precise manufacture of the flank angle
• - saliva resistant

A 2 mm VA sheet was used for production and this with the help of wire erosion processed on an EC 3040 MAKINO. It could a manufacturing tolerance of the shear wrench of ± 2 µm (= ± 0.002 mm) can be achieved. The waiter surface quality corresponded to 4 µRmax. Following the manufactured raw key (see picture 4) surfaces hardened and gold-plated with 11 mm.

The connection of the Konik bracket described above and the corresponding Konik shear wrench drastically reduces the breakage rate when removing the edge Tooth enamel apparatus.

Claims (1)

The claim, which is to be protected, relates to the constructive, conical structure of the brackets, as well as the structure of the shear key and its electrical discharge machining. Generic term Improvement and new development of the constructive structure of so-called brackets (attachment) within the Edgewise application for orthopedic, fixed treatment techniques as well as the required orthodontic aids (shear key). Characteristic part of the patent claim is characterized in that the breakage rate when the firmly seated, ceramic-made brackets are removed by the newly developed shear wrench is significantly reduced. Repeated use of these ceramic brackets leads to lower costs for the jaw treatment.