KR101505069B1 - The rubber composition for orthodontic devices and manufacture method for orthodontic device for rubber using the same - Google Patents

Abstract

The present invention relates to a rubber composition for an orthodontic device and a manufacturing method for an orthodontic device using the same. The rubber composition for an orthodontic device comprises 30-40 parts by weight of zerosil, 0.5-5 parts by weight of 2,5-bit(t-butylperoxy)2,5-dimethylhexane (DBPMH), 1-5 parts by weight of butylated hydroxy toluene (BHT) and 2.5-5 parts by weight of plasticizers based on 100 parts by weight of silicone. The rubber composition for an orthodontic device and the manufacturing method for an orthodontic device using the same according to the present invention are able to minimize problems such as psychological anxiety, time loss, economical loss and the like by retarding the discoloration of the rubber for an orthodontic device by adding phenol based butylated hydroxytoluene.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a rubber composition for a orthodontic appliance, and a method for manufacturing a rubber for a orthodontic appliance using the same. BACKGROUND OF THE INVENTION 1. Field of the Invention [0001]

[0001] The present invention relates to a rubber composition for a orthodontic appliance and a method for manufacturing a rubber for a orthodontic appliance using the same, and more particularly to a rubber composition for a orthodontic appliance, The present invention relates to a rubber composition for an orthodontic appliance and a method for manufacturing a rubber for a orthodontic appliance using the same.

Occlusion refers to the state in which the teeth of the upper and lower jaws are engaged with each other when the mouth is closed, and malocclusion is a condition in which the tooth arrangement is not aligned due to a cause or the state of the upper and lower teeth is out of the normal position. .

The cause of this malocclusion is generally known to be genetically influenced by many factors, such as tooth shape, size, environmental effects, poor habits, poor posture, dental caries, and congenital disorders such as cleft lip and palate And may also cause health problems or functional problems such as caries, periodontal disease, chewing function and unstable pronunciation phenomenon.

Malocclusion is a cause of psychological anxiety that the appearance of teeth and face may have a negative effect on interpersonal relationships, which can be a handicap for the parties.

For this reason, orthodontic treatment, which is a field of dental treatment in modern society, resolves the mental anxiety factors such as oral health and oral function problems as well as psychological anxiety that can be caused by malocclusion.

Corrective actions such as closing the extraction space, closing the teeth, correcting the midline, controlling the rotation of the teeth, improving the occlusal occlusion and stabilizing occlusion must be given constant physical force, .

There are rubber bands used for horizontal and vertical problems between mandibular dentition, reverse occlusion and canonicality inconsistency, and back-to-back movements of the canine and chain rubber used to move the teeth back and forth on the archwire Chain elastics, a rubber thread used for the movement of severely rotated teeth, ambulation teeth and lingual positioned teeth, a rotation wedge used for treatment to prevent tooth rotation therapy and regression, Elastic separators for the purpose of widening the gap between the teeth to be fitted with the band and elastomeric modules for securing the wire in the bracket slot.

These rubbers have an arbitrary replacement cycle due to a decrease in physical force or discoloration of the rubber surface. Other rubber products for orthodontic treatment, such as rubber bands, are recommended for replacement cycles of 4 weeks, except for special cases where replacement is required once every 12 to 24 hours to achieve the ideal correction force. However, in the case of a rubber ring for ligation, it is being changed at least once every 2 to 3 weeks in order to relieve the psychological anxiety caused by the discoloration of the surface before the recommended replacement cycle. In the case of the treated person, It is inconvenient to continuously check the discoloration of the rubber at the time.

Due to the above-mentioned problems, an increase in the amount of rubber replacement required for orthodontic treatment leads to a time loss and an economic loss, and such a loss causes a problem in that people who are treated may be dissatisfied with the treatment.

As such, the rubber is an excellent tool for the orthodontic appliance, and its functional usability is excellent, but there is a problem that the user may be psychologically uneasy due to discoloration on the surface of the rubber.

In addition, there is a growing awareness of the need for orthodontic treatment to increase the proportion of aesthetic problems in human relationships and to improve the health and functional status, while domestic technology for orthodontic treatment devices is less than expected. There is a problem that the dependency on the product is continuously increasing.

For example, Korean Patent No. 10-1350901 discloses a bracket for orthodontic braces, which is used for correcting teeth using a calibration wire, in which a slit for supporting the calibration wire is formed at a downward angle Bracket; And a B-type bracket in which a slat for supporting the calibration wire is formed at an upward angle. Accordingly, it is possible to reduce the time required for the operation while eliminating the cost increase factor based on a relatively simple structure, and to improve the convenience of the correction by reducing the foreign body sensation of the wearer.

However, since it has not been proved that the present invention can have the same orthodontic force as that of the conventional orthodontic appliance, it is possible to replace the orthodontic orthodontic appliances which have already been worn or commonly used This is a difficult situation to do.

In addition, there is also a problem in that it is unclear as to whether or not the cost can be reduced because the calibration wire is used instead of the rubber.

Korean Registered Patent No. 10-1350901 (Announced 2014.01.14.)

SUMMARY OF THE INVENTION The present invention has been accomplished in view of the above-mentioned problems, and an object of the present invention is to provide a method for retarding discoloration of a rubber for a orthodontic appliance by adding phenol-based butylated hydroxytoluene (BHT) The present invention also provides a rubber composition for a tooth correcting device using the same.

To achieve the above object, the present invention provides a rubber composition for a orthodontic appliance comprising 30 to 40 parts by weight of Zerosil, 2,5-bit (t-butylperoxy) 2 0.5 to 5 parts by weight of 5-dimethylhexane, 1 to 5 parts by weight of butylated hydroxytoluene (BHT) and 2.5 to 5 parts by weight of a plasticizer.

At this time, the silicon may be composed of at least one of polydimethylsiloxane and oligosiloxane.

In order to accomplish the above object, the present invention provides a method for manufacturing a rubber for a dental-orthodontic appliance using a rubber composition for a dental prosthesis, the method comprising: mixing 30 to 40 parts by weight of Zerosil with respect to 100 parts by weight of silicon; 0.5 to 5 parts by weight of 2,5-dimethylaniline (DBPMH), 1 to 5 parts by weight of butylated hydroxytoluene (BHT), and 2.5 to 5 parts by weight of a plasticizer. 5 parts by weight of the mixture is mixed for 1 hour and 30 minutes to 2 hours and 30 minutes; Heating the mixture at a temperature of 120 ° C to 170 ° C for 1 hour and 30 minutes to 2 hours and 30 minutes; A vacuum dehydrating step of vacuum-dehydrating the heated mixture at a temperature of 165 ° C to 170 ° C for 1 hour and 20 minutes to 1 hour and 40 minutes; Cooling the vacuum and dewatered mixture for 1 hr 20 min to 1 hr 40 min to lower the internal temperature of the mixture to 70 ° C to 80 ° C; And a molding step of molding the cooled mixture into an O-ring type rubber by a vulcanization process for 5 minutes to 10 minutes in a press having a temperature of 170 ° C to 180 ° C ± 2 ° C.

At this time, the silicon may be composed of at least one of polydimethylsiloxane and oligosiloxane.

The rubber composition for a orthodontic appliance according to the present invention and the method for producing a rubber for a orthodontic appliance using the same are improved in color stability by adding phenol-based butylated hydroxy toluene (BHT) It is possible to minimize the problems such as psychological anxiety, temporal and economic loss.

In addition, the rubber composition for the orthodontic appliance according to the present invention and the method for manufacturing a rubber for a orthodontic appliance using the same can replace the rubber for orthodontics, which is dependent on foreign imports, It is possible to improve the domestic orthodontic technology and improve the national medical service.

BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 is a molecular structural formula of butylated hydroxytoluene in a rubber composition for a dental prosthesis according to one embodiment of the present invention,
FIG. 2 is a graph comparing brightness change values of an o-ring and a tongue ring formed by using the rubber composition for a orthodontic appliance of FIG. 1,
FIG. 3 is a graph comparing red chroma saturation values of an o-ring and a tao ring formed by using the rubber composition for a dental orthodontic appliance of FIG. 1,
FIG. 4 is a graph comparing changes in yellow saturation of the o-ring and the tongue ring formed using the rubber composition for the orthodontic appliance of FIG. 1,
FIG. 5 is a graph showing a comparison of color change values of an O-ring and a Tao ring formed using the rubber composition for a orthodontic appliance of FIG. 1,
6 is a flowchart showing a method of manufacturing a rubber for a dental-orthodontic appliance using the rubber composition for a dental-orthodontic appliance according to an embodiment of the present invention.

Hereinafter, a rubber composition for a orthodontic appliance according to the present invention and a method for manufacturing a rubber for a orthodontic appliance using the same will be described in detail with reference to the accompanying drawings.

Generally, discoloration of rubber occurs by action such as auto-oxidation or rancidity. At this time, the automatic oxidation refers to an oxidation reaction occurring at room temperature in contact with oxygen in the air, and the organic acid such as fatty acids or the wax is acidic due to the action of oxygen, light, heat, . This reaction also applies to the aging of polymer compounds and the discoloration of pigment gloss.

The initial stage of autoxidation of organic compounds in rubber is that the fatty acid chains absorb partial oxygens of unsaturated bonds and alpha-methyl groups, forming hydroperoxides. In addition, the resulting peroxidic radical is unstable, so it shifts to other unsaturated bonds and forms free radicals. These reactions act in a chain and eventually cause the appearance of rancidity.

Reaction process result RH + initiator R · R + O2 ROO · H ROO · + RH ROOH + R R · + R · Inert product R + ROO Inert product ROO · + ROO · Inert product

// Table 1 above analyzes the discoloration mechanism of the rubber.

In Table 1, RH denotes an unsaturated fatty acid molecule, R denotes an activating radical, ROO denotes a peroxide radical, and ROOH denotes a hydroperoxide.

The reaction of the activation radical with the activation radical, the reaction between the activation radical and the peroxide radical, and the addition of the additive which can break the chain reaction in the reaction of the peroxide radical and the peroxide radical, will prevent the discoloration due to oxidation or rancidity .

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a molecular structural formula of butylated hydroxytoluene of a rubber composition for a dental prosthesis according to one embodiment of the present invention. Fig.

The rubber composition for a orthodontic appliance of the present invention comprises 30 to 40 parts by weight of Zerosil, 0.5 to 5 parts by weight of 2,5-bit (t-butylperoxy) 2,5-dimethylhexane (DBPMH) 5 to 5 parts by weight of butylated hydroxytoluene (BHT), and 2.5 to 5 parts by weight of a plasticizer.

At this time, the silicon may be composed of at least one of polydimethylsiloxane and oligosiloxane.

The zero seal is used as wet silica to reinforce the low tensile strength of the rubber cured with a pure polymer. The DBPMH is a rubbery rubber which is obtained by decomposing vulcanization after vulcanization of the silicone rubber, And is used as a compounding agent which reacts with an organic group to promote cross-linking.

The vulcanization process is a chemical process for improving the physical properties of natural rubber or synthetic rubber. The vulcanized rubber has a characteristic that the tensile strength is high, the rubber is resistant to swelling and abrasion, and the temperature range for maintaining elasticity is extended have. The simplest form of vulcanization is to heat the rubber with sulfur.

In order to explain the embodiment of the rubber composition for the orthodontic appliance, the following evaluation was made.

As the evaluation method, the rubber composition for the orthodontic appliance of the present invention was molded into an O-ring (hereinafter referred to as an embodiment), and the O-rings produced by the products of the molded example and the three comparative control companies Example 1, Comparative Example 2 and Comparative Example 3) were precipitated in distilled water maintained at 36.5 ° C to 37.5 ° C using a thermostat for 4 weeks to compare the degree of discoloration.

At this time, the temperature condition was based on the body temperature in the oral cavity, and the experimental period was based on the recommended replacement period (excluding the rubber band) of the orthodontic rubber product for 4 weeks.

In order to determine the degree of discoloration, the color change was quantitatively measured using a mechanical measuring method. At this time, a spectrophotometer (CM-3500d, MINOLTA, Japan) : Commission Internationale de l'Eclairage).

The L *, a *, and b * presented by the International Lighting Commission are reproduced in a simple form of the color space, and the values can be calculated using the formula. The results that have the greatest effect on color change are related to changes in L *, a * and b * values.

At this time, the L * value indicates the brightness of the color, and the higher the value, the lighter the color. In addition, a * value is a value indicating red saturation, (+) means the degree of red, and (-) means the degree of green. In addition, the b * value represents the degree of yellow saturation, and (+) means the degree of yellow and (-) means the degree of blue.

The L *, a *, and b * values can be compared and determined by calculating a color difference (E *) value through the following equation (1).

[Equation 1]

? E * = [(? L *) ² + (? A *) ² + (? B *) ² ] ^1/2

The color measurement was carried out by firstly measuring the O-rings of Examples and Comparative Examples 1, 2 and 3 before precipitating them in distilled water, and comparing the O-rings of the above Examples and Comparative Example 1, Comparative Example 2 and Comparative Example 3 with distilled water And then color change was measured sequentially at 1 day, 1 week, 2 weeks and 4 weeks.

Adjustment of the zero point was made by adhering the absorber to the sensing part of the chromatic difference system before the color measurement, and standard values were adjusted for the values of L *, a * and b * using a standard black plate and a white plate. The light transmission mode was set to the reflection mode, the light source was set to D-65 °, and the IC (Intergration Share Set) was set to SCE (Specular Component Excluded).

The evaluation results according to the above evaluation method are shown in Table 2 below.

DELTA L * DELTA a * ? B * ? E * Example 1 day 0.35 0.06 0.39 0.53 1 week 0.39 0.07 0.80 0.89 2 weeks 0.43 0.11 0.86 0.97 4 weeks 0.44 0.17 0.87 0.99 Comparative Example 1 1 day 0.51 0.12 0.61 0.80 1 week 0.53 0.15 1.17 1.30 2 weeks 0.52 0.16 1.20 1.32 4 weeks 0.54 0.20 1.21 1.34 Comparative Example 2 1 day 0.47 0.10 0.53 0.72 1 week 0.51 0.15 1.02 1.14 2 weeks 0.50 0.19 1.04 1.17 4 weeks 0.53 0.22 1.03 1.18 Comparative Example 3 1 day 0.50 0.12 0.73 0.89 1 week 0.53 0.17 1.26 1.38 2 weeks 0.53 0.18 1.25 1.37 4 weeks 0.55 0.22 1.28 1.41

(ΔL *), a change in red saturation (Δa *) and a change in yellow saturation (Δb *) in comparison with Comparative Example 1, Comparative Example 2 and Comparative Example 3, And the color difference (DELTA E *) shows the smallest change value.

Fig. 2 is a graph comparing the brightness change values of the o-ring and the tongue ring formed using the rubber composition for the orthodontic appliance of Fig. 1. Fig.

Referring to FIG. 2, the L * value is a value indicating a brightness index. The average value (? L *) of the brightness indexes of Comparative Example 1 and Comparative Example 3 from 1 day to 4 weeks were 0.525 for Comparative Example 1, 0.5 for Comparative Example 2, and 0.528 for Comparative Example 3. As a result, it can be seen that Comparative Example 1 and Comparative Example 3 have no difference in the degree of change almost similar to the change value. In Comparative Example 2, the variation width is improved by about 4% as compared with Comparative Example 1 and Comparative Example 3 Able to know.

On the other hand, the change (? L *) of the brightness index of the embodiment was 0.35, 0.39, 0.43, and 0.44, respectively, which were 31.4%, 26.4%, and 17.3 %, And 18.5% for 4 weeks, respectively, and the performance was improved to 16.9% and 20% for 4 weeks on the basis of Comparative Example 2 and Comparative Example 3, respectively.

(ΔL *) values of the brightness indexes of Comparative Examples 1 to 3 on the basis of the average (ΔL *) of the brightness indexes of the Examples are shown in Table 3 below.

Comparative Example 1 Comparative Example 2 Comparative Example 3 1 day 31.3 25.5 30 1 week 26.4 23.5 26.4 2 weeks 17.3 14 18.9 4 weeks 18.5 17 20

As can be seen from Table 3, the degree of brightness change of the Examples is smaller than that of Comparative Examples 1 to 3, and the degree of actual change is insufficient in all of Comparative Examples 1 to 3, but quantitatively 4 The performance difference is at least 17% on a weekly basis.

FIG. 3 is a graph comparing red chroma saturation values of an o-ring and a tao ring formed by using the rubber composition for the orthodontic appliance of FIG.

Referring to FIG. 3, the a * value is a value indicating red saturation. (+) Indicates the degree of red, and (-) indicates the degree of green. Comparative Example 1 to Comparative Example 3 It can be seen that the change in red saturation (DELTA a *) has a variation range of about 10%, showing a similar tendency of change, but in the case of the embodiment, the change value after 1 day is 0.06 , Which is lower than that of Comparative Examples 1 to 3, and that the change value after 4 weeks also has the lowest change value of 0.17.

The average values of the red saturation (? A *) of Comparative Examples 1 to 3 on the basis of the average value (? A *) of the red saturation of the Example are shown in Table 4 below.

Comparative Example 1 Comparative Example 2 Comparative Example 3 1 day 50 40 50 1 week 53.3 53.3 58.8 2 weeks 31.3 42.1 38.9 4 weeks 15 22.7 22.7

As shown in Table 4, it was found that the degree of red chroma variation in the Examples was smaller than that in Comparative Examples 1 to 3, 15% after 4 weeks, 22.7% from Comparative Example 2, 3 shows a performance difference of 22.7% or more.

FIG. 4 is a graph comparing changes in the yellow saturation of the O-ring and the Tao ring formed using the rubber composition for the orthodontic appliance of FIG.

Referring to FIG. 4, the b * value indicates the saturation of yellow, (+) indicates the degree of yellow, and (-) indicates the degree of blue. The tendency of the change of the color saturation (Δb *) of yellow color is similar, but the tendency of change up to 4 weeks is similar.

It can be seen that the product of Comparative Example 3 showing the highest variation width in the variation of each period of Comparative Examples 1 to 3 was 20% compared with that of Comparative Example 3. However, the embodiment showed a variation of 29% in comparison with Comparative Example 3, and the lowest change following the brightness and the red saturation.

The average value (? B *) of the yellow saturation of Comparative Examples 1 to 3 on the basis of the average value (? B *) of the yellow saturation of the Example is shown in Table 5 below.

Comparative Example 1 Comparative Example 2 Comparative Example 3 1 day 36.1 26.4 46.6 1 week 31.6 21.6 36.5 2 weeks 28.3 17.3 31.2 4 weeks 28.1 15.5 32

As shown in Table 5, it was found that the yellow saturation change values of the Examples were smaller than those of Comparative Examples 1 to 3, 28.1% of Comparative Example 1 after 4 weeks, 15.5% of Comparative Example 2, And the performance difference is 32% or more.

FIG. 5 is a graph comparing color change values of an o-ring and a tongue ring formed by using the rubber composition for a orthodontic appliance of FIG. 1.

The color difference change (ΔE *) value represents the relative color change among the color values defined in the CIE, and is an important factor determining the degree of discoloration in the product. This is a more meaningful value than the L *, a * and b * values, and the color difference is confirmed by applying the E * value to the product.

5, Comparative Example 1, Comparative Example 2, and Comparative Example 3 showed similar shape change curves during the test period. Of Comparative Examples 1 to 3, Comparative Example 2 had the lowest change width Able to know. Comparative Example 2 is a variation range corresponding to about 17% level as compared with Comparative Example 3. However, as described above, in the measurement results of the change in brightness, the change in red saturation, and the change in yellow saturation, the performance of the embodiment was improved to 16.1% in 4 weeks compared to Comparative Example 2, which was the best among Comparative Examples 1 to 3 It can be seen that it is improved.

The color difference change (ΔE *) values of the examples were 0.53 after 1 day, 0.89 after 1 week, 0.97 after 2 weeks, and 0.99 after 4 weeks, respectively, which was below the reference value 1 mentioned in the study using spectrophotometer. This may be significantly lower than the literature and experimental data that are generally referred to as limitations of clinically acceptable color differences when the color difference change (ΔE *) value is less than 3.3.

The average values of the color difference changes (DELTA E *) of Comparative Examples 1 to 3 on the basis of the average value of color difference change (DELTA E *) of the embodiment are shown in Table 6 below.

Comparative Example 1 Comparative Example 2 Comparative Example 3 1 day 33.8 26.4 40.4 1 week 31.5 22 35.5 2 weeks 26.5 17.1 29.2 4 weeks 26.1 16.1 29.8

As shown in Table 6, it was found that the color difference change values of Examples were smaller than those of Comparative Examples 1 to 3, 26.1% of Comparative Example 1 after 4 weeks, 16.1% of Comparative Example 2, And 29.8%, respectively.

The rubber composition for a orthodontic appliance according to the present invention and the method for producing a rubber for a orthodontic appliance using the same can improve the color stability through addition of phenol-based butylated hydroxytoluene, thereby delaying the discoloration of the rubber for a orthodontic appliance Problems such as psychological anxiety, time and economic loss can be minimized.

In addition, the rubber composition for the orthodontic appliance according to the present invention and the method for manufacturing a rubber for a orthodontic appliance using the same can replace the rubber for orthodontics, which is dependent on foreign imports, It is possible to improve the domestic orthodontic technology and improve the national medical service.

6 is a flowchart showing a method of manufacturing a rubber for a dental-orthodontic appliance using the rubber composition for a dental-orthodontic appliance according to an embodiment of the present invention. Hereinafter, a method of manufacturing a rubber for a dental-orthodontic appliance using the rubber composition for a dental-orthodontic appliance according to an embodiment of the present invention will be described with reference to FIG.

The rubber manufacturing method for the orthodontic appliance using the rubber composition for orthodontic appliance comprises five steps of mixing step S110, heating step S120, vacuum dewatering step S130, cooling step S140, Forming step S150.

The mixing step (S110) may include mixing 30 to 40 parts by weight of Zerosil, 0.5 to 5 parts by weight of 2,5-bit (t-butylperoxy) 2,5-dimethylhexane (DBPMH) with respect to 100 parts by weight of silicon, 1 to 5 parts by weight of butylated hydroxytoluene (BHT), and 2.5 to 5 parts by weight of a plasticizer are mixed and mixed for 1 hour 30 minutes to 2 hours 30 minutes.

At this time, the silicon may be composed of at least one of polydimethylsiloxane and oligosiloxane.

The heating step (S120) is a step of heating the mixture at a temperature of 120 ° C to 170 ° C for 1 hour and 30 minutes to 2 hours and 30 minutes.

The vacuum dewatering step (S130) is a step of vacuum-dehydrating the heated mixture at a temperature of 165 ° C to 170 ° C for 1 hour and 20 minutes to 1 hour and 40 minutes.

The cooling step S 140 is a step of cooling the vacuum and dehydrated mixture for 1 hour 20 minutes to 1 hour 40 minutes to lower the internal temperature of the mixture to 70 ° C to 80 ° C.

The forming step S150 is a step of vulcanizing the cooled mixture in a press having a temperature of 170 ° C to 180 ° C ± 2 ° C for 5 minutes to 10 minutes to form an O-ring type rubber.

At this time, in the forming step S150, the rubber may be deformed in various forms according to the use of the rubber.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the invention as defined by the appended claims. It is obvious that you can do it.

Claims (4)

30 to 40 parts by weight of Zerosil, 0.5 to 5 parts by weight of 2,5-bit (t-butylperoxy) 2,5-dimethylhexane (DBPMH), 100 parts by weight of butylated hydroxytoluene 1 to 5 parts by weight of BHT (Butylated Hydroxy Toluene) and 2.5 to 5 parts by weight of a plasticizer.
The method of claim 1,
Wherein the rubber composition is composed of at least one of polydimethylsiloxane and oligosiloxane.
30 to 40 parts by weight of Zerosil, 0.5 to 5 parts by weight of 2,5-bit (t-butylperoxy) 2,5-dimethylhexane (DBPMH), 100 parts by weight of butylated hydroxytoluene 1 to 5 parts by weight of BHT (Butylated Hydroxy Toluene) and 2.5 to 5 parts by weight of a plasticizer, and mixing for 1 hour and 30 minutes to 2 hours and 30 minutes;
A heating step (S120) of heating the mixture at a temperature of 120 ° C to 170 ° C for 1 hour and 30 minutes to 2 hours and 30 minutes;
A vacuum dewatering step (S130) of vacuum-dehydrating the heated mixture at a temperature of 165 ° C to 170 ° C for 1 hour and 20 minutes to 1 hour and 40 minutes;
A cooling step (S140) of cooling the vacuum and dewatered mixture for 1 hour 20 minutes to 1 hour and 40 minutes to lower the internal temperature of the mixture to 70 ° C to 80 ° C; And
Molding step (S150) of molding the cooled mixture into o-ring type rubber by vulcanization for 5 minutes to 10 minutes in a press having a temperature of 170 占 폚 to 180 占 占 폚;
And a rubber composition for a tooth correcting device.
4. The method of claim 3,
A method for manufacturing a rubber for a orthodontic appliance using a rubber composition for a orthodontic appliance, which comprises at least one of polydimethylsiloxane and oligosiloxane.

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