JPS5850951A - Bracket for orthodontia - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a member [114! It is something to do.

Generally, to straighten a straight line, an elastic tube of full-length wire is used. 9. A load-bearing tube is applied to the straightened tooth due to bending or tension of the wire, and the tooth is moved in the direction of the load. I will correct it.

At this time, the basic method of attaching the Kinpo wire to one piece is to attach it to a component called a bracket by gluing it or fixing it with gold I14 strip, and then sandwiching the metal wire. To keep it in place on the T-isthmus bracket, it is tied with a thin metal wire or secured with an elastic rubber ring.

Even with these conventional methods, there are strong demands to improve the ease of treatment work and improve aesthetics, and for example, adhesives are being used as an alternative to metal strips for fixing brackets to painting objects. There is - I'm making it for G.

The present invention achieves a dramatic improvement in aesthetics by eliminating the need for ligature wires and elastic rubber rings for maintaining metal wires by using a bracket that has a completely different function from conventional brackets.

Next, a specific example will be explained.

FIG. 1 shows a conventional method, and 1 is an orthodontic wire. 2 is a bracket, and the bracket 2 is composed of a base portion 5, a wall portion 4, and a collar portion 5. The straightening wire 1 is held in a groove 6 formed by the walls 4 and 4' of the bracket 2, and is ligated with a ligature wire 7 so as not to come off the groove 6.

Therefore, conventional brackets are complicated, have a large curved shape, and have poor aesthetic appearance. For this reason, the subject suffers a great deal of mental pain from aesthetic reasons, as well as pain from the tongue and lips due to the shape.

FIG. 2 shows a bracket 11 according to the invention.

11Ii orthodontic wire. aFi is the bracket of the present invention, and is composed of a base portion 9, a wall portion 10, and a buckle portion 11. The straightening wire 1 #'i is fitted into the groove 12 formed by the wall 10° 11' by being pushed in the direction of the arrow.

The bracket of the present invention has elasticity at the portion where the orthodontic wire is held, that is, at the wire holding area. With IpH, it is possible to attach and remove the straightening wire 1 on the wall 10 or buckle 11, and there is usually a warning to prevent the wire from coming loose.

In order to ensure the present invention, by using an alloy mainly composed of Ni--Ti intermetallic compound as the material of the bracket, the % modulus f of superelasticity can be utilized. Superelasticity has an extremely high elastic deformability in which it returns to its original shape upon unloading after 5 to 8 deformations in a tensile test. As a result, a desired elastically deformable tube can be obtained even when the shape and size of the bracket, especially the size of the elastic portion, is extremely small.

Note that it is also possible to use a material that does not suffer from elastic deformation, such as a Ni-Ti alloy, at least in the parts involved in holding the wire, or to use a Ni-Ti alloy for the entire placenta to maintain the superelastic effect even when the wire is in place. It can be obtained by applying partial heat treatment so that the heat treatment occurs only in the areas related to the retention of the heat.

Furthermore, although it is desirable that the straightening wire can freely move in the longitudinal direction, in the present invention, the cross-sectional shape or size of the straightening wire and the shape or size of the groove of the bracket are controlled. Due to the elasticity of the wire holding portion of the bracket, an appropriate mounting state without loosening can be obtained, and smooth movement in the longitudinal direction can be obtained.

Next, superelasticity, which is the key point of the present invention, will be explained.

Metal materials having a superelastic effect include alloys mainly composed of Ni-Ti gold intermetallic alloys, and their tljIVc are Cu-
Zn, 0u-Zn-X (X = 81.8n, M, etc.), (
! u-AI-Ni, Mu-Oa, Mu-Cd, Ni
There are alloys such as -AI, Cu-Au-Zn, and Ou-Eln. These alloys are generally called thermoelastic ordered lattice alloys that undergo martensitic transformation, and superelasticity is due to the stress-induced martensitic transformation that occurs in the temperature range above the martensitic ctqii degrees of these metal parts and its reverse. The driving force is metamorphosis. In general, this transformation has a property that the hysteresis of the forward and reverse transformation of the parent phase (austenite phase)-martensite correlation is small and that it is crystallographically reversible. Crystallographically reversible means that the reverse transformation not only returns to the crystal structure of the parent phase, but also returns the crystal orientation to its original state.

Of the W4m materials that can obtain the above superelasticity, N1-
Ti alloy is polycrystalline and has excellent general properties as a metal material, such as corrosion resistance, and is therefore ideal for use as an orthodontic member.

In particular, research has recently progressed to improve the properties of tliNi-T1 alloys, and not only Ni-Ti binary alloys.

Superelasticity with extremely small hysteresis is obtained by exchanging N1 with Ou and 1・Mei tiaorci.
·be able to.

) ii-Ti alloy exhibits superelasticity at approximately 5 (L 5 atdN1 or higher) and at 57° C., which corresponds to the intraoral temperature.

As an example of the present invention, 5α7at %N1−'I'1
The tensile properties of the alloy are shown in Figure 5.

In the practice of the present invention, the Ni--Ti joint is drawn into a desired cross-sectional shape, and then subjected to a final heat treatment.

In the previously described embodiment, the load for pushing the orthodontic wire into the bracket is such that the wall dimension of the bracket is α3.
For X 2111+, about 500 to 1. The ODOgy load is sufficient.

As described above, the work performed by the orthodontist of the present invention during treatment can be easily performed, and from a functional point of view, smooth fitting can be obtained between the orthodontic wire and the bracket at the threshold.

Even in light subjects, if the correction member is made even slightly smaller or has a simpler shape, it will be possible to completely reduce the pain, as well as the aesthetic and psychological distress.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing a conventional method of ligating an orthodontic wire to a bracket, and FIG. 2 is a perspective view showing a method of fitting an orthodontic wire to a bracket according to the present invention. FIG. 3 is a stress curve diagram showing the tensile properties of the Ni-Ti alloy. 1... Orthodontic wire 2... Conventional bracket 7... Conventional ligation wire 8... Bracket of the present invention and above. Seikosha Agent Patent Attorney Mogami & , = Figure 3

Claims (1)

[Scope of Claims] 111 161 In an orthodontic bracket consisting of a base portion that is attached to the body and a wire holding portion that grasps and maintains the orthodontic wire, the wire holding portion is provided with elastic deformability. Orthodontic brackets with special features. (2) The straight orthodontic bracket according to claim 1, characterized in that the wire holding part Kg is deformed due to elasticity. (3) The orthodontic bracket according to Claims 1 and 2, in which at least the wire holding portion is made of a pot mainly composed of a Ni-Ti metal compound.