WO2024258217A1 - Retainer and manufacturing method therefor - Google Patents

Abstract

The present invention relates to a retainer and a manufacturing method therefor, the retainer comprising a shape part output by a 3D printer so as to have the same shape as the teeth of a wearer, wherein the output shape part is coupled to the teeth of the wearer so as to stabilize the position of the orthodontic teeth. The retainer is output by the 3D printer so as to have the same shape as the teeth of the wearer, and is coupled to the teeth of the wearer and has excellent elasticity so as not to sustain fractures caused by chewing movements of the teeth, and can prevent the teeth of the lower jaw from spreading. The retainer can be closely coupled to the teeth of the wearer and, even after being worn, can prevent aesthetic deterioration caused by the retainer, and since the curve between the retainer and the teeth is gradual, teeth brushing by a patient using a toothbrush is facilitated such that tartar formation can be suppressed. In addition, the retainer can inhibit the growth of bacteria, and has material properties that can be adjusted through the addition of organic nano materials and/or inorganic nano materials.

Description

Retainer and method of manufacturing same

The present invention relates to a retainer and a method for manufacturing the same, and more particularly, to a retainer used to fix the position of corrected teeth after orthodontic treatment and a method for manufacturing the same.

A retainer basically serves to fix the position of a patient's teeth. In other words, the retainer can prevent the corrected tooth position from changing over time.

In particular, it is common to use retainers in the post-treatment process of orthodontic treatment. Orthodontic treatment involves active influence on the position of the patient's teeth, and forces are applied to the teeth by appropriate devices, so that the teeth change their position or orientation over time.

After such orthodontic treatment is completed and the use of the orthodontic appliance is completed, the teeth tend to return to their previous position. If post-treatment is not performed, the results obtained by active treatment are at least partially regressed, thereby making active treatment meaningless.

Therefore, after active treatment, it is usually recommended to use a retainer to fix the newly acquired tooth position. To achieve this, the retainer is bonded to a plurality of teeth, and the retainer receives the force generated by the desired intrinsic mobility of the teeth and distributes this force to the remaining teeth. By the above action, the movement of the teeth can be prevented.

These retainers can be broadly divided into adhesive retainers that are attached to the teeth and removable retainers that can be removed at will like a mouth piece.

Most adhesive retainers today use a triplex wire made by twisting three wires together and attaching them to the teeth using dental bond.

Meanwhile, in the case of adhesive retainers using triplex wires, the patient's teeth shape is modeled using a pink material called alginate, and a plaster model is made based on this. The manufacturer then directly bends the triplex wire to match the curvature of the teeth surface of the plaster model.

The triplex wire manufactured in this way has the advantage of being easy to manufacture because it is deformable, and has a certain degree of elasticity, so it allows for subtle physiological movements when each tooth receives force. However, it has the problem that it does not adhere perfectly to the surface of the teeth, so it crosses the concave areas between the teeth on the inner surface, which is uncomfortable for the tongue, and food can get stuck in the concave areas or plaque can form, causing inflammation and tooth decay.

In addition, the above-mentioned removable retainer is used by fitting it over the entire teeth in the form of a mouth piece, so even after correction is complete, the retainer, like a mouth piece, must be fitted over the entire teeth and used continuously, which is inconvenient.

There is a need to develop a retainer that can solve the above problems.

[Prior art literature]

[Patent Document]

(Patent Document 1) KR 10-2020-0071270 A1

An object of the present invention is to provide a retainer and a method for manufacturing the same.

Another object of the present invention is to provide a retainer that is output by a 3D printer and has the same shape as the wearer's teeth, the retainer is bonded to the wearer's teeth, has excellent elasticity, does not break due to chewing movement of the teeth, and prevents the teeth of the lower jaw from spreading apart.

Another object of the present invention is to provide a retainer that can be closely combined with the wearer's teeth, so that there is no gap between the teeth and the retainer, thereby preventing foreign substances from getting caught in the lower part of the retainer, preventing deterioration of aesthetics after wearing, and having a gentle curve between the retainer and the teeth, thereby making it easy for the patient to brush their teeth using a toothbrush, thereby suppressing the formation of tartar.

Another object of the present invention is to provide a method for manufacturing a retainer capable of inhibiting bacterial growth by including an antibacterial substance and having improved physical properties by including organic and inorganic nanomaterials.

In order to achieve the above purpose, a retainer according to one embodiment of the present invention includes a shape portion output by a 3D printer to have the same shape as the wearer's teeth, and the output shape portion can be combined with the wearer's teeth to stabilize the position of the orthodontic teeth.

The above-mentioned shape portion includes shapes corresponding to the wearer's 31st and 41st teeth, and the shape portions corresponding to the 31st and 41st teeth are combined to prevent breakage due to the chewing movement of the teeth and to prevent the teeth of the lower jaw from spreading apart.

The above-mentioned shape portion may include a shape corresponding to the teeth 31 and 41, or may include a shape corresponding to one tooth or two teeth continuous on both sides centered on the teeth 31 and 41.

The above retainer can be fixed by attaching it to the wearer's teeth by applying resin to the inside.

The above retainer may be transparent or may be implemented in the same color as the teeth by coloring.

The above photocurable resin composition may include a photocurable oligomer; a reactive monomer; a photoinitiator and other additives.

A method for manufacturing a retainer according to another embodiment of the present invention comprises: a 3D input step of receiving 3D information on an oral structure;

A 3D model generation step for generating multiple 3D models by dividing the oral structure into multiple regions with the central axis of the oral structure as the x-axis by setting the range of interest using the above 3D information; and

It includes a 3D output step of outputting the above plurality of 3D models using a 3D printer, wherein the 3D models have the same shape as the wearer's teeth, and the shape portion output by the 3D output step can be combined with the wearer's teeth to stabilize the position of the orthodontic teeth.

The present invention relates to a retainer and a manufacturing method thereof, which includes a shape portion output by a 3D printer to have the same shape as the wearer's teeth, and the output shape portion is combined with the wearer's teeth to stabilize the position of orthodontic teeth. The present invention relates to a retainer output by a 3D printer to have the same shape as the wearer's teeth, and the retainer is combined with the wearer's teeth to prevent breakage due to the chewing movement of the teeth due to excellent elasticity and to prevent the teeth of the lower jaw from spreading apart.

In addition, as a retainer that can be closely combined with the wearer's teeth, it can prevent the aesthetics from being reduced by the retainer even after being worn, and since the curvature between the retainer and the teeth is gentle, it is easy for the patient to brush their teeth using a toothbrush, and thus the formation of tartar can be suppressed.

The above retainer can suppress bacterial growth by including an antibacterial substance. In addition, the material properties can be adjusted by adding organic nano-materials and/or inorganic nano-materials.

Figure 1 is an example of the use of a retainer according to one embodiment of the present invention.

FIG. 2 is a photograph of a retainer according to one embodiment of the present invention.

FIG. 3 is a photograph of a retainer according to one embodiment of the present invention.

Figure 4 shows the GPC measurement results for a photocurable oligomer according to one embodiment of the present invention.

Figure 5 shows the NMR measurement results for a photocurable oligomer according to one embodiment of the present invention.

Figure 6 shows the GPC measurement results for a photocurable oligomer according to one embodiment of the present invention.

Figure 7 shows the NMR measurement results for a photocurable oligomer according to one embodiment of the present invention.

Figure 8 shows the GPC measurement results for a photocurable oligomer according to one embodiment of the present invention.

Figure 9 shows the NMR measurement results for a photocurable oligomer according to one embodiment of the present invention.

Figure 10 shows the GPC measurement results for a photocurable oligomer according to one embodiment of the present invention.

Figure 11 shows the NMR measurement results for a photocurable oligomer according to one embodiment of the present invention.

Figure 12 shows the GPC measurement results for a photocurable oligomer according to one embodiment of the present invention.

Figure 13 shows the NMR measurement results for a photocurable oligomer according to one embodiment of the present invention.

The present invention relates to a retainer including a shape portion output by a 3D printer to have the same shape as the wearer's teeth, and the output shape portion is combined with the wearer's teeth to stabilize the position of orthodontic teeth.

Hereinafter, embodiments of the present invention will be described in detail so that those skilled in the art can easily implement the present invention. However, the present invention may be implemented in various different forms and is not limited to the embodiments described herein.

A retainer is used to prevent the teeth that have been corrected from returning to their original position after orthodontic treatment. As explained above, retainers are divided into adhesive retainers and removable retainers that can be removed at will, like a mouthpiece.

Retainers currently in use suffer from a locking effect that may be referred to as "interlocking".

The above mutual locking means that although the retainer does in fact achieve the desired stabilizing effect, it connects the teeth to each other so strongly that any load applied locally to a tooth is distributed substantially evenly over all the teeth.

Independent movements in the sagittal direction are greatly inhibited by the retainer. The same applies to vertical movements and rotations of the teeth around the vertical axis.

Thus, the impact force due to the external force is permanently reduced for each individual tooth, and as a result, the alveolar bone to which the tooth is held by its root is stimulated much less than in the absence of a retainer, i.e. under “natural conditions”.

However, these stimuli are particularly important because they induce stimulation of bone tissue so that bone tissue is preserved. When stimulation of bone tissue is reduced, bone tissue deteriorates.

Thus, as the impact force on each individual tooth is reduced, the impact of the external force on the bone tissue is locally reduced, causing the alveolar bone to degenerate in the area of the "interlocked" teeth.

That is, although retainers can maintain the positions of corrected teeth by "mutual locking," this effect can cause problems due to the load being applied to the entire teeth. Development of a retainer to prevent these problems is required.

Specifically, a retainer according to one embodiment of the present invention includes a shape portion output by a 3D printer to have the same shape as a wearer's teeth, and the output shape portion can be combined with the wearer's teeth to stabilize the position of the orthodontic teeth.

Figures 1 to 3 are photographs of a retainer according to one embodiment of the present invention and exemplary photographs of wearing. The shape of the retainer of the present invention is determined by the shape of the wearer's teeth. That is, as described below, a 3D model is formed using the wearer's oral structure, and the 3D model is manufactured by 3D printing.

That is, it is output in a shape that fits the wearer's tooth structure. The retainer is used by being combined with the wearer's teeth, and is characterized by including 2 to 6 tooth shapes as shown in Fig. 1.

Conventional removable retainers fix the position of teeth by means of wires, and the positions of the entire teeth can be maintained by mutually locking the wires.

In addition, conventional adhesive retainers are attached to the back of teeth to maintain the position of orthodontic teeth. As previously explained, adhesive retainers are attached to the back of teeth and do not adhere perfectly to the wearer's teeth surface. Therefore, they cross the concave areas between the teeth on the inner surface of the teeth, which causes discomfort to the tongue, and food gets stuck in the concave areas or plaque forms, which causes inflammation and tooth decay.

The retainer of the present invention is intended to improve the problems of the conventional retainers, and can be used as either a removable retainer or an adhesive retainer. That is, it is a method of using a shape portion that is custom-printed using the shape of the teeth and being combined with the wearer's teeth, so that it can be used as a removable retainer by being inserted only at a desired time. In addition, it can also be used by applying resin inside and bonding it to the back of the teeth.

In particular, when used as an adhesive retainer, unlike conventional adhesive retainers, the shape of the teeth is printed as is, so the back of the teeth also maintains a smooth surface, so the tongue does not feel uncomfortable, and it is printed so as to be in complete contact with the teeth, and can prevent problems such as foreign substances getting caught in the bottom of the teeth and retainer due to bonding.

More specifically, the shape portion of the retainer according to one embodiment of the present invention includes a shape corresponding to the wearer's 31st tooth and 41st tooth, and the shape portions corresponding to the 31st and 41st teeth are combined to prevent breakage due to the chewing movement of the teeth and to prevent the teeth of the lower jaw from spreading apart.

In general, orthodontic teeth have a problem in which the lower teeth are separated by the chewing motion during the process of eating food. To prevent this problem, retainers are used to prevent the teeth from being separated and maintain the position of the orthodontic teeth.

Accordingly, the teeth most affected by the above-mentioned chewing motion are the 31st tooth and the 41st tooth, and the retainer of the present invention includes a shape corresponding to the 31st tooth and the 41st tooth, and can be used by being fitted to the 31st tooth and the 41st tooth of the wearer.

As described above, when used with retainers fitted on teeth 31 and 41, force is applied to the retainer by the chewing movement of the maxillary teeth. If physical force is applied by the maxillary teeth, this can be considered a factor that causes damage to the retainer.

Accordingly, the retainer of the present invention is characterized in that it has excellent elasticity after being printed using a 3D printer, and thus is not damaged by physical force applied by maxillary teeth.

More specifically, the retainer has excellent elasticity with an elongation of 30 to 40%, and due to this characteristic, it does not cause damage when used as a retainer. In addition, since it is used while being fitted on the 31st tooth and the 41st tooth which are directly affected by the chewing movement, it can exert a force to directly correct the position of the 31st tooth and the 41st tooth. However, as described above, unlike the conventional retainer, the load is not applied to the entire tooth. That is, the conventional retainer used a method of being bonded to the entire tooth in order to maintain the position, but the retainer of the present invention is characterized in that it is used by being bonded to only a specific tooth, so that no force is applied to the entire tooth.

A retainer according to one embodiment of the present invention can be coupled to the teeth 31 and 41, or to one tooth or two teeth continuous on both sides with the teeth 31 and 41 as the center. That is, the retainer of the present invention includes a shape that can be coupled corresponding to the teeth 31 and 41, or can be used in a form fitted to one tooth or two teeth continuous on both sides with the teeth 31 and 41 as the center.

Specifically, the shape portion of the retainer of the present invention may include shapes corresponding to the 31st tooth and the 41st tooth, or may include shapes corresponding to the 31st tooth, the 32nd tooth, the 41st tooth, and the 42nd tooth, or may include shapes corresponding to the 31st tooth, the 32nd tooth, the 33rd tooth, the 41st tooth, the 42nd tooth, and the 43rd tooth.

That is, the retainer of the present invention may include two, four or six tooth shapes.

By including a shape portion as described above, it can be fitted to the wearer's teeth or adhered while fitted to exhibit an orthodontic maintenance effect.

In addition, the retainer according to one embodiment of the present invention can be transparent or have the same color as the teeth through coloring. That is, the retainer of the present invention is printed using a 3D printer, uses a photocurable resin composition as described below, and the retainer manufactured using the photocurable resin composition of the present invention has excellent transparency.

A transparent retainer can enhance aesthetics by making it difficult to easily check whether the retainer is being used even when it is fitted on the wearer's teeth. In addition, by including a dye in the photocurable resin composition, the same color as the wearer's teeth can be realized. The same color as the color of the teeth can be realized to enhance aesthetics.

A retainer according to one embodiment of the present invention may be output by a 3D printer using a photocurable resin composition.

The photocurable polymer composition for a 3D printer may include a photocurable oligomer for 3D printing represented by the following chemical formula 1; a monomer; a photoinitiator; and a stabilizer:

[Chemical Formula 1]

[Correction under Rule 91 30.09.2024]

[Chemical formula 2]

[Chemical Formula 3]

[Chemical Formula 4]

[Chemical Formula 5]

[Chemical formula 6]

Here,

n is an integer from 1 to 100,

m is an integer from 1 to 50,

A, B, C and D are identical or different from each other and are repeating units each independently selected from the group consisting of compounds represented by chemical formulas 2 to 6,

a, b, c and d are equal to or different from each other and are each independently an integer from 1 to 30,

R ₁ and R ₂ are the same or different, and can each independently be selected from the group consisting of hydrogen, deuterium, a substituted or unsubstituted alkyl group having 1 to 30 carbon atoms, a substituted or unsubstituted alkenyl group having 2 to 30 carbon atoms, a substituted or unsubstituted alkynyl group having 2 to 30 carbon atoms, a substituted or unsubstituted aryl group having 6 to 30 carbon atoms, and a substituted or unsubstituted heteroaryl group having 1 to 30 carbon atoms.

The above photocurable oligomer is characterized by including a urethane acrylate structure as a main chain, a photocurable functional group bonded to the urethane structure, and including a soft functional group and a hard functional group in the compound.

The output exhibits flexible properties due to the soft functional group included in the photocurable composition, and can also exhibit heat resistance due to the hard functional group.

That is, by combining a photocurable functional group with a photocurable oligomer and utilizing a soft functional group and a hard functional group, a flexible effect can be exhibited by utilizing a carbon skeleton having soft properties at room temperature, and heat-resistant properties can also be exhibited by utilizing a carbon skeleton having hard properties at room temperature.

Since the above photocurable oligomer contains a carbon skeleton having hard properties, it can produce a 3D printing output product having excellent physical properties such as thermal properties, strength, elastic modulus, and tensile elongation, and can be restored to its original shape by heat.

In addition, since the photocurable oligomer contains a carbon skeleton with soft properties, its shape can be transformed by an external force after heat is provided.

In general, a composition for a 3D printer may include, as described below, a photocurable oligomer for 3D printing; a monomer; a photoinitiator; and a stabilizer. The oligomer, monomer, photoinitiator, and stabilizer included in the composition all affect the physical properties of the output, but the oligomer has the greatest effect. Accordingly, in general, in order to improve the physical properties of the 3D output, only a carbon skeleton having a hard property is included, which can improve the physical properties of the output, but conversely, if the shape is deformed due to use, the shape cannot be restored, which causes a problem in that it cannot be used multiple times.

Since the composition for a 3D printer of the present invention includes a carbon skeleton having a hard property and a carbon skeleton having a soft property, not only is it excellent in physical properties such as thermal properties, strength, elastic modulus, and tensile elongation, but also can utilize the flexible property of the soft functional group, so that when the shape is deformed by an external force in a state where heat is provided, the deformed shape can be fixed, and when heat is provided again, the original shape can be restored.

The above A, B and D are the same as or different from each other, and can be repeating units each independently selected from compounds represented by chemical formula 2 or 3.

The above C may be a repeating unit selected from the group consisting of compounds represented by chemical formulas 4 to 6.

Specifically, the photocurable oligomer represented by the above chemical formula 1 can be manufactured by a method for synthesizing a urethane acrylate series. Basically, it proceeds by a stepwise polymerization reaction of a diol and a diisocyanate, and in order to prevent gelation of the material due to an increase in molecular weight during the polymerization process of the material, an acrylic monomer having no reaction site is used as a suspension. The monomer used in the synthesis of the oligomer of the present invention as an available acrylic monomer may be Isobornyl acrylate, Cyclic Trimethylolpropane Formal Acrylate, Lauryl acrylate, Lauryl methacrylate, 3,5,3-trimethelhexyl acrylate, Tetrahydrofurfuryl acrylate, Tetrahydrofurfuryl methacrylate, Benzyl methacrylate, etc.

More specifically, diol was pre-introduced into the monomer base used primarily as a monomer to stabilize it, and then diisocyanate was introduced. As the urethane reaction progressed, reaction heat was generated, the urethane chain became longer, and the molecular weight increased.

As the molecular weight increases, the viscosity of the material may also increase. If the above-mentioned molecular weight increase proceeds rapidly, the temperature rises rapidly, which also causes the urethane reaction to proceed more quickly, and as a result, the oligomer is gelled before reaching a sufficient molecular weight, making it impossible to use as a material. Accordingly, in the present invention, in order to prevent this reaction, a solvent for introducing a diol is selected from the group consisting of Isobornyl acrylate, Cyclic Trimethylolpropane Formal Acrylate, Lauryl acrylate, Lauryl methacrylate, 3,5,3-trimethelhexyl acrylate, Tetrahydrofurfuryl acrylate, Tetrahydrofurfuryl methacrylate, Benzyl methacrylate, and mixtures thereof. The solvent does not participate in the reaction, and is used to control the reaction speed of the material and prevent a rapid increase in viscosity due to an increase in molecular weight. In addition, the monomers for synthesizing the oligomer of the present invention must not have a functional group capable of reactive urethane reaction, such as a hydroxyl group or a urethane group. Through the conditions described above, it will be said that the present invention can produce the oligomer with excellent mass production and process stability.

In addition, the equivalent ratio of diol and diisocyanate was set to a state where the equivalent of diisocyanate was higher than that of diol, so that the oligomer terminal exists as an isocyanate group. A reaction catalyst including a Zn-based catalyst can be used during the reaction process. The catalyst may or may not be included. The catalyst is included to make the reaction proceed more quickly, and the reaction can proceed even if it is not necessarily included, but even if it is included, the reaction can proceed with a very small amount added.

After the temperature increase was stopped due to the completion of the urethane reaction, 2-hydroxy acrylate and 2-hydroxy methacrylate were added dropwise to end-cap the ends of the oligomers.

The diols used for the production of the above oligomers are as follows:

In addition, the diisocyanate for reacting with the above diol is as follows:

Additionally, monomers that may be included to terminate the urethane reaction or increase the molecular weight are as follows:

The compound represented by the chemical formula 1 manufactured by the above manufacturing method can be selected from the group consisting of the following compounds:

Here,

c, d, e, f, g, h, i, j, k, l, m' and n' are the same or different and are each independently an integer from 1 to 100.

The photocurable oligomer may have a number average molecular weight (Mn) of 1,500 to 6,000, 1,500 to 5,500, or 1,600 to 5,000. The photocurable oligomer may have a weight average molecular weight (Mw) of 2,500 to 9,000, 3,000 to 8,500, or 3,500 to 8,000.

Using an oligomer having a number average molecular weight and a weight average molecular weight within the above range, a photocurable composition for 3D printing, which will be described later, is manufactured, and using the same, a retainer customized to a patient's oral structure can be printed, and using the same, the convenience of use for the patient can be improved and the orthodontic maintenance effect can be increased. Specifically, the retainer of the present invention is immersed in water at 50 to 100°C and then deformed into a shape, so that the shape changes to the deformed shape to improve the convenience of wearing the retainer, and thereafter, it is restored to the original shape by body temperature to exhibit the orthodontic maintenance effect.

As described above, when various oligomers are selected according to the physical properties required for each product, such as tensile strength, flexural strength, flexural elasticity, and flexural strength, and a photocurable composition for 3D printing is manufactured using the same, the composition can exhibit characteristics as a shape memory polymer and can be provided as a patient-specific maxillofacial expansion device.

The above photocurable oligomer may have a viscosity of 2,000 psi to 3,500 psi, 2,100 psi to 3,200 psi, or 2,200 psi to 3,000 psi. When a photocurable composition is prepared using an oligomer having a viscosity in the above range, it can be provided with a viscosity suitable for use in a 3D printer.

The photoinitiator may be BP, TPO, DCP, BPO, DPPO, etc., and preferably DPPO (2-hydroxy-2-methylpropiophenone), but is not limited to the above examples, and any photoinitiator capable of producing a photocurable composition may be used without limitation.

The above stabilizer may be selected from the group consisting of tertiary amines such as diethylethanolamine and trihexylamine, hindered amines, organic phosphates, and hindered phenols, but is not limited to the above examples, and any stabilizer capable of producing a photocurable composition may be used without limitation.

In addition to the above photoinitiator and stabilizer, other additives may be additionally included.

The above additives may include conventional additives such as leveling agents, slip agents or stabilizers to improve thermal and oxidation stability, storage stability, surface properties, flow properties and process properties.

A photocurable composition according to one embodiment of the present invention may contain 1 part by weight of a photoinitiator per 100 parts by weight of a UV resin. The UV resin includes a photocurable oligomer of the present invention; and a monomer, and more specifically, may contain a compound represented by the following chemical formula 1, a compound represented by the following chemical formula 7, and a compound represented by the following chemical formula 8 in a weight ratio of 1:1:1 to 2:1:1.

The manufacturing of the retainer of the present invention includes a 3D input step of receiving 3D information on an oral structure, a 3D model generation step of setting a range of interest using the 3D information and generating a plurality of 3D models divided into a plurality of regions with the central axis of the oral structure as the x-axis, and a 3D output step of outputting the plurality of 3D models using a DLP (Digital Light Processing) method.

The 3D output unit outputs multiple 3D models using the DLP (Digital Light Processing) method. The 3D output unit can produce the entire orthodontic device in a short period of time by outputting each 3D model simultaneously or at different times. The 3D output unit can output a retainer using the photocurable composition for a 3D printer of the present invention according to the user's settings.

The above retainer is manufactured by printing using a 3D model using the DLP method, and thus the thickness of a specific part can be adjusted to increase fixing strength and stability.

In addition, the 3D output section can perform surface treatment on each boundary surface to strengthen the bonding between multiple 3D outputs corresponding to multiple 3D models. For example, UV treatment or heat treatment can be performed on the boundary surface of each 3D output, but is not necessarily limited thereto. This is to roughen the boundary surface between 3D outputs to facilitate bonding between neighboring 3D outputs. Multiple divided 3D outputs can be bonded by applying resin to the boundary surface and then performing UV treatment or heat treatment.

Manufacturing example 1

Manufacturing of photocurable oligomers for 3D printing

Isobornyl acrylate was used as a solvent, and polypropylene glycol, cyclohexanedimethanol, and BHT were added, stirred at 10 to 200 rpm at 10 to 50°C, then isophorone diisocyanate was added and stirred at a stirring speed of 50 to 200 rpm under the same temperature conditions. After that, HEMA was added, stirred at 150 to 500 rpm at 50 to 250°C to produce an oligomer.

The intermediate compounds produced by the above reaction are as follows:

The above intermediate compound was reacted with the following monomer:

The oligomer finally produced by reacting the above intermediate compounds is as follows:

The GPC analysis results for the oligomer of the above Manufacturing Example 1 are as shown in Fig. 4. In addition, the NMR analysis results are as shown in Fig. 5.

Manufacturing example 2

An oligomer was prepared using the same method as in Manufacturing Example 1, but the monomer was changed during the reaction. The prepared oligomer is as follows:

The GPC analysis results for the oligomer of the above Manufacturing Example 2 are as shown in Fig. 6. In addition, the NMR analysis results are as shown in Fig. 7.

Manufacturing example 3

An oligomer was prepared using the same method as in Manufacturing Example 1, but the monomer was changed during the reaction. The prepared oligomer is as follows:

The GPC analysis results for the oligomer of the above Manufacturing Example 3 are as shown in Fig. 8. In addition, the NMR analysis results are as shown in Fig. 9.

Manufacturing example 4

An oligomer was prepared using the same method as in Manufacturing Example 1, but the monomer was changed during the reaction. The prepared oligomer is as follows:

The GPC analysis results for the oligomer of the above Manufacturing Example 4 are as shown in Fig. 10. In addition, the NMR analysis results are as shown in Fig. 11.

Manufacturing example 5

An oligomer was prepared using the same method as in Manufacturing Example 1, but the monomer was changed during the reaction. The prepared oligomer is as follows:

The GPC analysis results for the oligomer of the above Manufacturing Example 5 are as shown in Fig. 12. In addition, the NMR analysis results are as shown in Fig. 13.

The results of the analysis of the oligomers of the above manufacturing examples 1 to 5 are summarized in Table 1 below:

Manufacturing example 1 Manufacturing example 2 Manufacturing example 3 Manufacturing example 4 Manufacturing example 5 GPC Mn 4179 4102 1663 4767 2691 Mw 6944 6763 7855 7591 3703 PDI 1.68 1.65 1.68 1.59 1.38 NMR A
(6.44) O O O O O B
(5.89) O O O O O C
(5.61) O
(39.0) O
(39.3) O
(9.3) O
(22.1) X D
(4.91) O
(87.9) O
(89.6) O
(77.6) O
(86.4) O
(61.0) E
(6.48) X X O
(16.1) X O
(22.3) F(6.49) X X O X O G(3.41) O O O O O

Here,

c and d of Manufacturing Example 1 are the same or different and are each independently an integer from 1 to 100, and can be selected so that Mn is 4,179 and Mw is 6,944.

In Manufacturing Example 2, e to f are the same or different and are each independently an integer from 1 to 100, and can be selected so that Mn is 4,102 and Mw is 6,763.

In Manufacturing Example 3, h to j are the same or different and are each independently an integer from 1 to 100, and can be selected so that Mn is 1,663 and Mw is 7,855.

In Manufacturing Example 4, k and l are the same or different and are each independently an integer from 1 to 100, and can be selected so that Mn is 4,767 and Mw is 7,591.

In Manufacturing Example 5, m' and n' are the same or different and are each independently an integer from 1 to 100, and can be selected so that Mn is 2,691 and Mw is 3,703.

Experimental Example 1

Check physical properties

The viscosity of the oligomers of the above manufacturing examples 1 to 5 was measured, and the mechanical properties were measured after 3D printing.

In order to measure the mechanical properties, the oligomers of the above Preparation Examples 1 to 5, the compound represented by the following Chemical Formula 7, and the compound represented by the following Chemical Formula 8 were mixed in a weight ratio of 1:1:1, and 1 part by weight of DPPO was mixed with 100 parts by weight of the mixture to prepare a polymer composition, which was then placed in a 3D printer to prepare a specimen:

[Chemical formula 7]

[Chemical formula 8]

Specifically, the flexural strength was tested according to ISO 20795-2 and ISO 10477, and the tensile strength was tested according to ASTM D638.

Manufacturing example 1 Manufacturing example 2 Manufacturing example 3 Manufacturing example 4 Manufacturing example 5 Batch Size 50L 50L 50L 50L 50L Blending and
3D
Printing Output
After mechanical properties Flexural strength
(20795-2 Psalm, MPa) 171 162 155 163 150 Flexural elasticity
(20795-2 Psalm, MPa) 3939 3807 3800 3655 3594 Flexural strength (10477 specimens, MPa) 146 122 162 158 143 Tensile strength (D 638, MPa) 109 102 115 113 108 Elongation (D 638, %) 3.9 3.0 7.6 6.5 7.7 Viscosity (psi) 2880 2950 2220 2380 2380

It was confirmed that the specimens manufactured using the oligomers of the above manufacturing examples 1 to 5 exhibited excellent mechanical properties, and it was confirmed that printing using a 3D printer was possible through appropriate viscosity.

Manufacturing example 2

Manufacturing of retainers

Using the photocurable compositions of the above manufacturing examples 1 to 5, retainers (Examples 1 to 5) as in Fig. 4 were manufactured by printing using the DLP method.

Experimental Example 1

Property Evaluation Experiment

Tensile test conditions

Test Method: ASTM D638

Test Equipment: Universal Testing Machine

Test speed: 50mm/min

Grip distance: 115mm

Load cell: 3000N

Elasticity range: (0.05 ~ 0.25)%

Surrender point: 0.2% offset

Test environment: (23±2)℃, (50±5)% R.H.

The above experiment was conducted by commissioning the Korea Polymer Testing and Research Institute, and the specimens were provided by printing the photocurable compositions of Examples 1 to 5 using the DLP method as specimens according to the ISO 20795-2 standard.

For Examples 1 to 5, tensile tests and bending tests were conducted, and the results are shown in Table 3 below.

S10 S20 S30 S40 S50 Tensile strength (MPa) 50.21 47.58 51.23 52.12 51.39 Elongation (%) 39.24 37.12 39.59 40.14 40.25 Elastic modulus
(MPa) 1800 170 1810 1880 1855

According to the above experimental results, it was confirmed that the specimen using the photocurable composition of the present invention exhibited excellent tensile strength and high levels of elongation and elasticity.

Experimental example 2

Antibacterial effect experiment

Using Pseudomonas aeruginosa as a strain, 10 ⁶ bacteria were inoculated onto the photocurable compositions of Examples 1 to 4 printed using a 3D printer, and the antibacterial activity was measured by confirming the amount of microorganisms.

According to the measurement criteria, when the amount of microorganisms was 10 ³ or less, the antibacterial effect was evaluated as excellent, and when the amount of microorganisms was 10 ⁵ or less, the antibacterial effect was judged to be insufficient.

As a result of the experiment, Example 1 was analyzed to have a low antibacterial effect against harmful microorganisms since the amount of microorganisms was confirmed to be 10 ⁵ or less, but the other Examples 2 to 5 were confirmed to have excellent antibacterial effects when the amount of microorganisms was 10 ³ or less.

The present invention relates to a retainer and a method for manufacturing the same, and more particularly, to a retainer used to fix the position of corrected teeth after orthodontic treatment and a method for manufacturing the same.

Claims (7)

It includes a shape part printed by a 3D printer to have the same shape as the wearer's teeth. The above printed shape is combined with the wearer's teeth to stabilize the position of the orthodontic teeth. Retainer. In the first paragraph, The above shape portion includes shapes corresponding to the wearer's 31st and 41st teeth, The shape corresponding to the teeth No. 31 and 41 above is combined to prevent breakage due to chewing movement of the teeth and prevent the teeth of the lower jaw from spreading apart. Retainer. In the second paragraph, The above-mentioned shape portion includes a shape corresponding to the 31st tooth and the 41st tooth, or Including a shape corresponding to one or two teeth consecutively on both sides centered on the above-mentioned teeth No. 31 and No. 41. Retainer. In the first paragraph, The above retainer is fixed by applying resin to the inside and attaching it to the wearer's teeth. Retainer. In the first paragraph, The above retainer is transparent or is implemented with the same color as the teeth through coloring. Retainer. In the first paragraph, The above retainer is a photocurable oligomer for 3D printing represented by the following chemical formula 1; monomer; Photoinitiator; and A photocurable composition for 3D printing containing a stabilizer, which is printed using a 3D printer. Retainer: [Chemical Formula 1]

[Chemical formula 2]

[Chemical Formula 3]

[Chemical Formula 4]

[Chemical Formula 5]

[Chemical formula 6]

Here, n is an integer from 1 to 100, m is an integer from 1 to 50, A, B, C and D are identical or different from each other and are repeating units each independently selected from the group consisting of compounds represented by chemical formulas 2 to 6, a, b, c and d are equal to or different from each other and are each independently an integer from 1 to 30, R ₁ and R ₂ are the same or different, and can each independently be selected from the group consisting of hydrogen, deuterium, a substituted or unsubstituted alkyl group having 1 to 30 carbon atoms, a substituted or unsubstituted alkenyl group having 2 to 30 carbon atoms, a substituted or unsubstituted alkynyl group having 2 to 30 carbon atoms, a substituted or unsubstituted aryl group having 6 to 30 carbon atoms, and a substituted or unsubstituted heteroaryl group having 1 to 30 carbon atoms. 3D input stage for receiving 3D information about the oral structure; A 3D model generation step for generating multiple 3D models by dividing the oral structure into multiple regions with the central axis of the oral structure as the x-axis by setting the range of interest using the above 3D information; and It includes a 3D printing step of printing the above multiple 3D models using a 3D printer, The above 3D model has the same shape as the wearer's teeth. The shape output by the above 3D output step is combined with the wearer's teeth to stabilize the position of the orthodontic teeth. Method for manufacturing a retainer.

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