JPH0428359A - Manufacture of mouthpiece for teeth set correction - Google Patents

Abstract

PURPOSE:To permit easy installation of the title mouthpiece and prevent a specific tooth from being damaged, by using the mouthpiece in covering state on the whole teeth by preparing a plaster model for teeth set correction by correcting a teeth set plaster model which is prepared according to a patient's palate, and closely attaching and solidifying a softened thermoplastic polymer sheet on the model, and then demounting the solidified sheet. CONSTITUTION:A recessed teeth set model is made from a seal material according to a patient' s palate, and plaster is introduced into the recessed model, and a projecting teeth set plaster model is prepared, and correction is applied up to a corrected form on the basis of the plaster model, and a plaster model for teeth set correction is prepared. Then, a sheet-shaped thermoplastic polymer which possesses the superior strength and the elastomer characteristic such as ethylene-vinyl acetate copolymer is heat-softened and attached on the plaster model for teeth set correction, and further closely attached through heat shaping, and the teeth set of the model is correctly printed, and the thermoplastic polymer sheet is cooling-solidified to the normal temperature and demounted, thus a mouthpiece is obtained. Since the mouthpiece possesses rubber elasticity and is not so hard, the mouthpiece can be installed reasonably on the patient's teeth set, and since the compatibility to the tooth other than the corrected tooth is superior, the force applied onto the corrected tooth can be received in dispersion by the whole of the teeth.

Description

[Detailed Description of the Invention] [Background of the Invention] [Field of Industrial Application] The present invention provides a method for manufacturing an orthodontic mouthpiece that can easily correct the alignment of teeth without damaging the teeth. Regarding.

<Prior Art> Conventionally, orthodontic correction has generally been carried out by attaching a wire support to other normal teeth in order to apply force to the tooth to be corrected.

<Problem to be solved by the invention> However, with this method, not only are other normal teeth easily damaged, but also force is easily applied to some teeth. It had the disadvantage of causing tooth pain.

[Summary of the invention]

Summary> As a result of intensive research to solve the above problems, the present inventors have found that by using a special mouthpiece that is completely different from conventional orthodontic methods, teeth can be straightened without damaging other normal teeth. The present invention was developed based on the knowledge that unlike conventional orthodontic methods, it is possible to easily perform orthodontic treatment because the force applied to the tooth can be held by the entire tooth and a special force can be applied only to the tooth to be corrected. It was completed.

That is, the method for producing an orthodontic mouthpiece of the present invention involves modifying a dental plaster model taken from a patient with malaligned teeth to produce an orthodontic plaster model, and softening the orthodontic plaster model. The method is characterized in that the thermoplastic polymer sheet is closely attached, then assimilated, and then removed.

Effects> The orthodontic mouthpiece manufactured by the method for manufacturing an orthodontic mouthpiece of the present invention is easy to wear because it uses a soft material, and it can be used by covering the entire tooth, so it can be used for specific purposes. It won't hurt your teeth. It also has the remarkable effect of being easy to remove and clean your teeth and the inside of your mouth.

[Detailed description of the invention]

CI] Production of orthodontic plaster model (1) Production process of patient's dentition model In the method for producing an orthodontic mouthpiece of the present invention,
First, a concave dental model is made using an impression from the palate of the patient undergoing orthodontic treatment, and plaster is poured into this concave dental model to create a convex dental plaster model that accurately represents the patient's dentition. Make a model.

At this time, the impression chamber used to create the concave dentition model can be one that is generally used in the dental field, and examples include Nuricorn impression material, agar impression material, Alcine-1 impression material, and the like. Further, as the plaster used for the convex dental row plaster model, it is preferable to use hard plaster or super hard plaster.

(2) Production process of orthodontic plaster model Based on the convex plaster model of the patient's dentition produced by the above method, corrections are made to the final or stepwise shape to be corrected. In addition, we manufacture orthodontic plaster models.

This kind of orthodontic plaster model is made by filling the parts of the patient's orthodontic plaster model where you do not want to apply force in the direction to be corrected, and then applying the force in the opposite direction. Cut and make corrections.

Any tool can be used for cutting as long as it can cut plaster, but generally a technician's bur or hand piece is used. Also, overlay is done using composite resin, epoxy resin, etc.

Furthermore, any material may be used for the overlay as long as it has adhesive strength and tensile strength sufficient to withstand subsequent operations.

[■] Production of orthodontic mouthpiece (1) Thermoforming of thermoplastic polymer sheet A sheet-like thermoplastic polymer softened by heating is attached to the orthodontic plaster model produced by the above method. Then, the dentition of the orthodontic plaster model is accurately transferred by heat-forming it into close contact.

The thermoplastic polymer used here must have excellent elastomer properties and strength, and also be comfortable to wear.

In order to add E to the above conditions, the thermoplastic polymer used has a flexural modulus (ASTM D747) of 800 k
g/cm or less, preferably 50 to 500 kg/cm.

Materials that satisfy these conditions include ethylene/vinyl acetate copolymers, ethylene/acrylic ester copolymers, ethylene/methacrylic ester copolymers, ethylene and α-olefin copolymers, and polyethylene. In addition to ethylene resins, ethylene/propylene elastomers, ethylene/propylene/diene compound elastomers, styrene/butadiene (including hydrogenated products) elastomers, polyester elastomers, urethane elastomers,
Examples include polybutadiene.

Among these, it is preferable to use ethylene resins (especially ethylene/vinyl acetate copolymers, ethylene/α-olefin copolymers, polyethylene) and styrene/butadiene elastomers.

These may be used alone, mixed with other polymers, laminated, or with various additives added thereto.

Such additives include pigments, anti-aging agents, molding improvers, stabilizers, ultraviolet inhibitors, antioxidants, wear modifiers, and the like.

Further, the thickness of the thermoplastic polymer sheet is generally 0.2
5-3 mm s Preferably 0.3-1.5++++n
.

In particular, it is preferably 0.3~], +n+n.

As a specific method for thermoforming, it is preferable to use vacuum forming or pressure forming, but professional forming or slush molding may also be used.

The molding conditions for the matured form vary depending on the thermoforming method and the type of thermoplastic polymer.

In the case of vacuum forming and pressure forming, which are desirable thermoforming methods,
Since it is necessary to soften the thermoplastic polymer sheet, the Vicat softening point (J I
It is heated to a temperature above 7206) and below the melting point.

The thermoplastic polymer sheet that has accurately transferred the shape of the dentition that has been corrected by thermoforming is cooled to a temperature close to room temperature and solidified, removed from the dental plaster model, and cut using the periodontal area as a guide. By adjusting the shape, a concave orthodontic mouth screw can be obtained. In this case, the cutting may be done about 3 mm inside or outside the periodontal region, but it is better not to directly contact the periodontal region.

The concave orthodontic mouthpiece manufactured in this way has difficulty fitting only the teeth to be corrected;
The mouthpiece has a rubber elasticity of about 50 to 800 and is not very hard, so it can be easily attached to the patient's dentition.

In addition, since the parts other than the tooth to be straightened are well suited to each tooth, the force applied to the tooth to be straightened can be dispersed over the whole tooth, and the force can be stopped.

Also, since the mouthpiece is not very hard,
It is possible to produce multiple orthodontic mouthpieces of the same shape without damaging the orthodontic plaster model, and using this orthodontic plaster model as a base, further cutting, overlaying, and corrections can be made. The next stage of correction can also be performed, and such operations can be repeated multiple times to correct the dentition to a more normal alignment.

[Experiment example]

In order to more specifically explain the orthodontic mouthpiece of the present invention, experimental examples of Examples and Comparative Examples are shown below.

Example 1 Production of dental plaster model Impression of a patient with malaligned teeth undergoing correction of two front teeth was made with Alcine-1 impression material (Starmix, manufactured by Nippon Dental Co., Ltd.)
A tooth-shaped plaster model was created by pouring hard plaster (Diastone, manufactured by Mitsubishi Mining Cement ■) thereon.

Production of a plaster model for orthodontics Cut the front teeth of the dental plaster model to a thickness of 1 mm with a technical bur, and glue the opposite side of the cut area with an epoxy resin adhesive (Konishi Bond, manufactured by Konishi Co., Ltd.) At 1
．． A plaster model for orthodontic treatment was manufactured by building up the material to a thickness of mm.

Production of thermoplastic polymer sheet Ethylene/vinyl acetate copolymer resin (Mitsubishi Polyethylene-E
VA rV501HJ, manufactured by Mitsubishi Yuka ■, flexural modulus 4
00 kg/cm, Vicat softening point 54°C, melting point 91°
C) Thickness 0. A press sheet measuring 5 mm, 15 cm long and 15 am wide was placed on an absorption precision pressure welder (manufactured by Star Balla Sankin Kogyo ■), and when the press sheet was heated to a temperature of 85°C, the teeth Transfer was performed by placing it in close contact with a plaster model for alignment correction.

The transfer molded product formed by transfer as described above was cooled for 5 minutes with cold air from a dryer to solidify it. This transfer molded body could be easily removed from the plaster model.

Production of the mouthpiece The transfer molding with the concave portions 2 and convex portions 3 formed thereon was cut with scissors to match the position 2++++n above the periodontal region of the orthodontic plaster model to form the upper jaw as shown in Figure 1. Mouthpiece for orthodontic treatment of the maxillary dentition that can be attached separately to the dentition and the lower dentition] A mouthpiece for orthodontic treatment of the maxillary dentition; and a mouthpiece 1b for orthodontic treatment of the lower dentition. Peace] was created. When this orthodontic mouthpiece 1 was tested on a patient undergoing the above-mentioned orthodontic treatment by placing the concave portion 2 over the tooth row, it was found that it was easy to put on and the portion 4 covering the surface of the tooth row was placed on the two front teeth. The power of correction was added.

The orthodontic mouthpiece was worn on the patient with malaligned teeth for a month and then removed, the orthodontic plaster model was further cut by ]-mm, and the opposite side was cut by '1. m+
After overlaying and making corrections, a second-stage orthodontic plaster model was manufactured.

Then, using this second-stage orthodontic plaster model as a base, a thermoplastic polymer tube was attached again to produce a second-stage orthodontic mouthpiece.

When this second-stage orthodontic mouthpiece was attached to a patient with malaligned teeth who had undergone the first-stage orthodontic treatment, it was possible to wear the mouthpiece. This indicates that the first stage of orthodontic treatment has been sufficiently performed, and means that the second stage of orthodontic treatment has begun.

[Brief explanation of the drawing]

FIG. 1 shows a perspective view of an orthodontic mouthpiece according to an embodiment of the present invention. 1... Mouthpiece for orthodontic treatment, 1a... Mouthpiece for orthodontic treatment of upper jaw dentition, 1b... Mouthpiece for orthodontic treatment of lower dentition, 2... Concave portion, 3 ... Convex part, 4... Part that covers the surface of the tooth row, 5... Part that covers the surface of the gingiva.

Claims (1)

[Scope of Claims] 1. A plaster model for orthodontics is produced by modifying a plaster cast of teeth taken from a patient with malaligned teeth, and a softened thermoplastic polymer sheet is adhered to the plaster cast for orthodontics. A method for manufacturing an orthodontic mouthpiece, which is characterized in that the mouthpiece is hardened and then removed. 2. The method for producing an orthodontic mouthpiece according to claim 1, wherein the thermoplastic polymer has a flexural modulus (ASTM-D747) of 800 kg/cm or less.