Retainer and manufacturing method therefor

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 for manufacturing the same

[0001] 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.

[0002] A retainer essentially serves to fix the position of a patient's teeth. In other words, the retainer prevents the corrected tooth positions from changing over time.

[0003] In particular, the use of retainers is common in the post-treatment phase of orthodontic treatment. Orthodontic treatment involves active influence on the position of the patient's teeth. Force is applied to the teeth by appropriate devices, causing the teeth to change position or orientation over time.

[0004] After orthodontic treatment and the use of orthodontic appliances, teeth tend to return to their previous position. Without follow-up treatment, the results achieved through active treatment will at least partially regress, rendering the active treatment ineffective.

[0005] Therefore, after active treatment, it is common to recommend the use of a retainer to stabilize the newly acquired tooth position. To achieve this, the retainer is bonded to multiple teeth. The retainer absorbs the forces generated by the desired inherent mobility of the teeth and distributes these forces to the remaining teeth. This action prevents tooth movement.

[0006] 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 mouthpiece.

[0007] Currently, most adhesive retainers use a triplex wire made by twisting three wires and attaching them to the teeth using dental bond.

[0008] 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 bends the triplex wires to match the curvature of the teeth surface of the plaster model.

[0009] The triplex wire manufactured in this way has the advantage of being easy to manufacture because it can be deformed, and has the advantage of allowing for subtle physiological movements when each tooth is subjected to force because it has a certain degree of elasticity. However, it has the problem that it does not adhere perfectly to the tooth surface, so it crosses the concave areas between the teeth on the inside, which is uncomfortable for the tongue, and food can get stuck in the concave areas or plaque can form, causing inflammation and tooth decay.

[0010] In addition, the above-mentioned removable retainer is used by fitting it over the entire teeth in the form of a mouthpiece, so even after correction is complete, the retainer, like a mouthpiece, must be fitted over the entire teeth and used continuously, which is inconvenient.

[0011] There is a need to develop a retainer that can solve the above problems.

[0012] [Prior Art Literature]

[0013] [Patent Document]

[0014] (Patent Document 1) KR 10-2020-0071270 A1

[0015] An object of the present invention is to provide a retainer and a method for manufacturing the same.

[0016] Another object of the present invention is to provide a retainer that is printed by a 3D printer and has the same shape as the wearer's teeth, and that is bonded to the wearer's teeth, has excellent elasticity so that it does not break due to the chewing movement of the teeth, and prevents the teeth of the lower jaw from spreading apart.

[0017] 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, so that foreign substances do not get caught in the lower part of the retainer, so that the aesthetics are prevented from deteriorating even after wearing, and so that the curvature between the retainer and the teeth is gentle, so that the patient can easily brush their teeth using a toothbrush, and thus, so that the formation of tartar can be suppressed.

[0018] 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 an organic or inorganic nanomaterial.

[0019] 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.

[0020] The above-mentioned shape portion includes a shape corresponding to the wearer's teeth No. 31 and No. 41, and the shape portions corresponding to the teeth No. 31 and No. 41 are combined to prevent breakage due to chewing movement of the teeth and to prevent the teeth of the lower jaw from spreading apart.

[0021] The above-mentioned shape portion may include a shape corresponding to the 31st tooth and the 41st tooth, or may include a shape corresponding to one tooth or two teeth that are continuous on both sides with the 31st tooth and the 41st tooth as the center.

[0022] The above retainer can be fixed by applying resin to the inside and attaching it to the wearer's teeth.

[0023] The retainer may be transparent or may be colored to match the color of the teeth.

[0024] The above photocurable resin composition may include a photocurable oligomer; a reactive monomer; a photoinitiator and other additives.

[0025] 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;

[0026] A 3D model generation step of creating multiple 3D models by dividing the central axis of the oral structure into multiple regions with the x-axis as the center axis by setting the range of interest using the above 3D information; and

[0027] 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.

[0028] The present invention relates to a retainer and a method for manufacturing the same, which includes a shape portion printed by a 3D printer to have the same shape as a wearer's teeth, and the printed shape portion is combined with the wearer's teeth to stabilize the position of orthodontic teeth. The retainer is printed by a 3D printer and has the same shape as the wearer's teeth, and the retainer is combined with the wearer's teeth to prevent breakage due to chewing movement of the teeth due to excellent elasticity, and can prevent the teeth of the lower jaw from spreading apart.

[0029] In addition, it is a retainer that can be closely bonded to the wearer's teeth, so it can prevent the retainer from deteriorating the aesthetics even after wearing it, and the curvature between the retainer and the teeth is gentle, so it is easy for the patient to brush their teeth using a toothbrush, and thus, it can suppress the formation of tartar.

[0030] The above retainer can suppress bacterial growth by including an antibacterial substance. In addition, the material properties can be adjusted by adding organic nanomaterials and / or inorganic nanomaterials.

[0031] Figure 1 is an example of the use of a retainer according to one embodiment of the present invention.

[0032] FIG. 2 is a photograph of a retainer according to one embodiment of the present invention.

[0033] FIG. 3 is a photograph of a retainer according to one embodiment of the present invention.

[0034] Figure 4 shows the GPC measurement results for a photocurable oligomer according to one embodiment of the present invention.

[0035] Figure 5 shows the NMR measurement results for a photocurable oligomer according to one embodiment of the present invention.

[0036] Figure 6 shows the GPC measurement results for a photocurable oligomer according to one embodiment of the present invention.

[0037] Figure 7 shows the NMR measurement results for a photocurable oligomer according to one embodiment of the present invention.

[0038] Figure 8 shows the GPC measurement results for a photocurable oligomer according to one embodiment of the present invention.

[0039] Figure 9 shows the NMR measurement results for a photocurable oligomer according to one embodiment of the present invention.

[0040] Figure 10 shows the GPC measurement results for a photocurable oligomer according to one embodiment of the present invention.

[0041] Figure 11 shows the NMR measurement results for a photocurable oligomer according to one embodiment of the present invention.

[0042] Figure 12 shows the GPC measurement results for a photocurable oligomer according to one embodiment of the present invention.

[0043] Figure 13 shows the NMR measurement results for a photocurable oligomer according to one embodiment of the present invention.

[0044] The present invention relates to a retainer that includes a shape portion printed by a 3D printer to have the same shape as the wearer's teeth, and the printed shape portion is combined with the wearer's teeth to stabilize the position of the orthodontic teeth.

[0045] Hereinafter, embodiments of the present invention will be described in detail so that those skilled in the art can easily implement them. However, the present invention may be implemented in various different forms and is not limited to the embodiments described herein.

[0046] Retainers are used after orthodontic treatment to prevent teeth from returning to their original positions. As previously explained, retainers are divided into adhesive retainers and removable retainers, which can be removed at will, like a mouthpiece.

[0047] Retainers currently in use suffer from a locking effect that may be referred to as "interlocking."

[0048] The above mutual locking means that although the retainer does achieve the desired stabilizing effect, it connects the teeth too strongly to each other, and any load acting locally on the teeth is distributed substantially evenly over all the teeth.

[0049] Independent movement in the sagittal direction is significantly inhibited by the retainer. The same applies to vertical movement and rotation of the teeth around the vertical axis.

[0050] Thus, the impact force from the external force is permanently reduced for each individual tooth, and as a result, the alveolar bone to which the tooth is fixed by its root is stimulated much less than in the absence of a retainer, i.e. under "natural conditions".

[0051] However, these stimuli are particularly important because they induce bone tissue stimulation, which helps preserve bone tissue. Decreased bone tissue stimulation leads to bone degeneration.

[0052] Therefore, 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.

[0053] In other words, retainers can maintain the corrected position of teeth through "mutual locking," but this effect can cause problems due to the load applied to the entire tooth. The development of a retainer that prevents these problems is necessary.

[0054] 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 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.

[0055] Figures 1 to 3 are photographs of a retainer according to one embodiment of the present invention and examples of wearing the retainer. 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 retainer is manufactured by 3D printing using the 3D model.

[0056] 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.

[0057] 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.

[0058] In addition, conventional adhesive retainers are attached to the back of the teeth to maintain the position of the orthodontic teeth. As previously explained, adhesive retainers are attached to the back of the teeth and do not adhere perfectly to the wearer's teeth surface. Therefore, they cross the interdental concave areas 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.

[0059] The retainer of the present invention aims to improve upon the problems of conventional retainers, and can be used as either a removable or adhesive retainer. Specifically, it incorporates a custom-printed shape that utilizes the shape of the teeth, allowing it to be attached to the wearer's teeth. As a removable retainer, it can be worn only during a specific time period. Furthermore, it can be applied with resin applied to the interior and bonded to the back of the teeth.

[0060] Especially when used as an adhesive retainer, unlike conventional adhesive retainers, it prints the shape of the teeth as is, and the back of the teeth also maintains a smooth surface, so the tongue does not feel uncomfortable, it is printed so as to be in perfect contact with the teeth, and it can prevent problems such as foreign substances getting caught in the bottom of the teeth and retainer as it is bonded.

[0061] 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 chewing movement of the teeth and to prevent the teeth of the lower jaw from spreading apart.

[0062] Typically, orthodontic treatment causes the lower teeth to shift due to chewing movements during eating. To prevent this problem, retainers are used to prevent tooth shifting and maintain the corrected teeth's position.

[0063] Accordingly, the teeth most affected by the above-mentioned chewing motion are the 31st and 41st teeth, and the retainer of the present invention includes a shape corresponding to the 31st and 41st teeth, and can be used by being fitted to the wearer's 31st and 41st teeth.

[0064] When used with retainers fitted to teeth 31 and 41, as described above, the retainer is subject to force from the chewing movements of the maxillary teeth. Physical force exerted by the maxillary teeth can potentially damage the retainer.

[0065] 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 teeth of the upper jaw.

[0066] 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 and 41st teeth, which are directly affected by the chewing movement, it can exert a force to directly correct the positions of the 31st and 41st teeth. However, as described above, unlike the conventional retainer, the load is not applied to the entire tooth. That is, the conventional retainer uses a method of being attached to the entire tooth to maintain the position, but the retainer of the present invention is characterized in that it is used by being attached to only a specific tooth, so that no force is applied to the entire tooth.

[0067] A retainer according to one embodiment of the present invention can be coupled to the teeth 31 and 41, or to one or two teeth that are continuous on both sides of the teeth 31 and 41. That is, the retainer of the present invention includes a shape that can be coupled to the teeth 31 and 41, or can be used in a form that is fitted to one or two teeth that are continuous on both sides of the teeth 31 and 41.

[0068] Specifically, the shape portion of the retainer of the present invention may include a shape corresponding to the 31st tooth and the 41st tooth, or may include a shape corresponding to the 31st tooth, the 32nd tooth, the 41st tooth, and the 42nd tooth, or may include a shape corresponding to the 31st tooth, the 32nd tooth, the 33rd tooth, the 41st tooth, the 42nd tooth, and the 43rd tooth.

[0069] That is, the retainer of the present invention may include two, four or six tooth shapes.

[0070] By including the above-mentioned shape, it can be fitted to the wearer's teeth or bonded while fitted to exhibit an orthodontic maintenance effect.

[0071] In addition, a retainer according to one embodiment of the present invention can be transparent or have the same color as 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 a retainer manufactured using the photocurable resin composition of the present invention has excellent transparency.

[0072] Transparent retainers can enhance aesthetics by making it difficult to tell whether the retainer is still in use, even when fitted to the wearer's teeth. Furthermore, by incorporating a dye into the photocurable resin composition, the retainer can be made to match the color of the wearer's teeth. This can enhance aesthetics by matching the color of the teeth.

[0073] A retainer according to one embodiment of the present invention may be output by a 3D printer using a photocurable resin composition.

[0074] 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:

[0075] [Chemical Formula 1]

[0076] [Correction pursuant to Rule 91, September 30, 2024]

[0077] [Chemical Formula 2]

[0078]

[0079] [Chemical Formula 3]

[0080]

[0081] [Chemical Formula 4]

[0082]

[0083] [Chemical Formula 5]

[0084]

[0085] [Chemical Formula 6]

[0086]

[0087] Here,

[0088] n is an integer from 1 to 100,

[0089] m is an integer from 1 to 50,

[0090] A, B, C and D are the same 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,

[0091] a, b, c and d are the same or different and are each independently an integer from 1 to 30,

[0092] R1 and R2 are the same or different, and can each be independently 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.

[0093] 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.

[0094] 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.

[0095] 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 a soft property at room temperature, and heat-resistant properties can also be exhibited by utilizing a carbon skeleton having a hard property at room temperature.

[0096] Since the above photocurable oligomer includes a carbon skeleton having hard properties, it can produce a 3D printing output that has excellent physical properties such as thermal properties, strength, elastic modulus, and tensile elongation, and can be restored to its original shape by heat.

[0097] In addition, since the photocurable oligomer contains a carbon skeleton with soft properties, its shape can be deformed by an external force after heat is provided.

[0098] In general, a composition for a 3D printer may include a photocurable oligomer for 3D printing; a monomer; a photoinitiator; and a stabilizer, as described below. 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 a 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 is a problem in that it cannot be used multiple times.

[0099] 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, so that not only is it excellent in physical properties such as thermal properties, strength, elasticity, and tensile elongation, but also the flexible property of the soft functional group can be utilized together, so that when the shape is deformed by an external force in a state where heat is provided, it can be fixed in the deformed shape, and when heat is provided again, it can be restored to the original shape.

[0100] The above A, B and D are the same or different from each other, and may be repeating units independently selected from compounds represented by chemical formula 2 or 3.

[0101] The above C may be a repeating unit selected from the group consisting of compounds represented by chemical formulas 4 to 6.

[0102] 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 through 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 without a 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.

[0103] More specifically, diol was pre-introduced into the monomer base used as the primary monomer to stabilize it, and then diisocyanate was added. As the urethane reaction progressed, heat of reaction was generated, the urethane chain lengthened, and the molecular weight increased.

[0104] As the molecular weight increases, the viscosity of the material may also increase. If the above-mentioned increase in molecular weight proceeds rapidly, the temperature rises rapidly, which also causes the urethane reaction to proceed more quickly, and as a result, the oligomer gels before reaching a sufficient molecular weight, making it unusable as a material. Therefore, in the present invention, in order to prevent this reaction, a solvent 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 is used as a solvent for introducing the diol. 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. Additionally, the monomers used to synthesize the oligomer of the present invention must be free of functional groups capable of reactive urethane reactions, such as hydroxyl groups or urethane groups. Under the above conditions, the present invention can produce oligomers with excellent mass production and process stability.

[0105] 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 proceed the reaction 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.

[0106] 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.

[0107] The diols used for the preparation of the above oligomers are as follows:

[0108]

[0109]

[0110] In addition, the diisocyanate for reacting with the above diol is as follows:

[0111]

[0112]

[0113] Additionally, monomers that may be included to terminate the urethane reaction or increase the molecular weight are as follows:

[0114]

[0115]

[0116]

[0117]

[0118] The compound represented by the above chemical formula 1 manufactured by the above manufacturing method can be selected from the group consisting of the following compounds:

[0119]

[0120] Here,

[0121] 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.

[0122] 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.

[0123] By 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 described below is manufactured, and by using the same, a retainer customized to the oral structure of a patient can be printed, and by 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, thereby changing its shape into a deformed shape to improve the convenience of wearing the retainer, and thereafter, it can be restored to its original shape by body temperature to exhibit the orthodontic maintenance effect.

[0124] 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-tailored maxillary expansion device.

[0125] 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 manufactured using an oligomer having a viscosity within the above range, it can be provided with a viscosity suitable for use in a 3D printer.

[0126] The photoinitiator may be BP, TPO, DCP, BPO, DPPO, etc., and preferably DPPO (2-hydroxy-2-methylpropiophenone) may be used. However, the present invention is not limited to the above examples, and any photoinitiator capable of producing a photocurable composition may be used without limitation.

[0127] 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.

[0128] In addition to the above photoinitiator and stabilizer, other additives may be additionally included.

[0129] 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.

[0130] 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 may include 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.

[0131] The manufacturing of the retainer of the present invention includes a 3D input step of receiving 3D information about an oral structure, a 3D model generation step of creating a plurality of 3D models by setting a range of interest using the 3D information and dividing the central axis of the oral structure into a plurality of regions with the x-axis as the x-axis, and a 3D output step of outputting the plurality of 3D models using a DLP (Digital Light Processing) method.

[0132] The 3D output unit outputs multiple 3D models using DLP (Digital Light Processing). By outputting each 3D model simultaneously or simultaneously, the 3D output unit can quickly create the entire orthodontic device. The 3D output unit can output a retainer using the photocurable composition for a 3D printer of the present invention, based on user settings.

[0133] 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.

[0134] In addition, the 3D output unit may perform surface treatment on each boundary surface to strengthen the bonding between multiple 3D outputs corresponding to multiple 3D models. For example, the boundary surface of each 3D output may be subjected to UV treatment or heat treatment, but is not necessarily limited thereto. This is to roughen the boundary surface between 3D outputs to facilitate bonding between adjacent 3D outputs. The multiple divided 3D outputs may be bonded by applying resin to the boundary surface and then performing UV treatment or heat treatment, etc.

[0135]

[0136] Manufacturing Example 1

[0137] Manufacturing of photocurable oligomers for 3D printing

[0138] Isobornyl acrylate was used as a solvent, and polypropylene glycol, cyclohexanedimethanol, and BHT were added, and stirred at 10 to 200 rpm at 10 to 50°C. Isophorone diisocyanate was added, and stirring was performed under the same temperature conditions while changing the stirring speed from 50 to 200 rpm. Afterwards, HEMA was added, and stirring was performed at 150 to 500 rpm at 50 to 250°C to produce an oligomer.

[0139] The intermediate compounds produced by the above reaction are as follows:

[0140]

[0141] The above intermediate compound was reacted with the following monomer:

[0142]

[0143]

[0144] The oligomer finally produced by reacting the above intermediate compounds is as follows:

[0145]

[0146] 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.

[0147]

[0148] Manufacturing Example 2

[0149] An oligomer was prepared using the same method as in Manufacturing Example 1, but the monomers used during the reaction were different. The prepared oligomers are as follows:

[0150]

[0151] 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.

[0152]

[0153] Manufacturing Example 3

[0154] An oligomer was prepared using the same method as in Manufacturing Example 1, but the monomers used during the reaction were different. The prepared oligomers are as follows:

[0155]

[0156] 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.

[0157]

[0158] Manufacturing Example 4

[0159] An oligomer was prepared using the same method as in Manufacturing Example 1, but the monomers used during the reaction were different. The prepared oligomers are as follows:

[0160]

[0161] 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.

[0162]

[0163] Manufacturing Example 5

[0164] An oligomer was prepared using the same method as in Manufacturing Example 1, but the monomers used during the reaction were different. The prepared oligomers are as follows:

[0165]

[0166] 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.

[0167] The results of the analysis of the oligomers of the above manufacturing examples 1 to 5 are summarized in Table 1 below:

[0168] Manufacturing Example 1 Manufacturing Example 2 Manufacturing Example 3 Manufacturing Example 4 Manufacturing Example 5 GPCMn41794102166347672691Mw69446763785575913703PDI1.681.651.681.591.38NMRA(6.44)OOOOOB(5.89)OOOOOC(5.61)O(39.0)O(39.3)O(9.3)O(22.1)XD(4.91)O(87.9)O(89.6)O(77.6)O(86.4)O(61.0)E(6.48)XXO(16.1)XO(22.3)F(6.49)XXOXOG(3.41)OOOOO

[0169] Here,

[0170] 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.

[0171] e to f of Manufacturing Example 2 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.

[0172] 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.

[0173] 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.

[0174] 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.

[0175]

[0176] Experimental Example 1

[0177] Check physical properties

[0178] The viscosity of the oligomers of the above manufacturing examples 1 to 5 was measured, and the mechanical properties were measured after 3D printing.

[0179] 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:

[0180] [Chemical Formula 7]

[0181]

[0182] [Chemical Formula 8]

[0183]

[0184] Specifically, flexural strength was measured according to ISO 20795-2 and ISO 10477, and tensile strength was measured according to ASTM D638.

[0185] Manufacturing Example 1 Manufacturing Example 2 Manufacturing Example 3 Manufacturing Example 4 Manufacturing Example 5 Batch Size 50L 50L 50L 50L 50L Mechanical Properties after Blending and 3D Printing Flexural Strength (20795-2 Specimen, MPa) 171 162 155 163 150 Flexural Elasticity (20795-2 Specimen, MPa) 393 93 80 73 80 0 365 53 59 4 Flexural Strength (104 77 Specimen, 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) 288 0 295 0 222 0 238 0 2380

[0186] 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.

[0187] Manufacturing Example 2

[0188] Manufacturing of retainers

[0189] Using the photocurable compositions of Manufacturing Examples 1 to 5, retainers (Examples 1 to 5) as shown in Fig. 4 were manufactured by printing using the DLP method.

[0190]

[0191] Experimental Example 1

[0192] Physical property evaluation experiment

[0193] Tensile test conditions

[0194] Test method: ASTM D638

[0195] Test device: Universal Testing Machine

[0196] Test speed: 50mm / min

[0197] Grip distance: 115mm

[0198] Load cell: 3000N

[0199] Elasticity range: (0.05 ~ 0.25)%

[0200] Surrender point: 0.2% offset

[0201] Test environment: (23±2)℃, (50±5)% RH

[0202] The above experiment was conducted by requesting 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.

[0203] For Examples 1 to 5, tensile tests and bending tests were conducted, and the results are shown in Table 3 below.

[0204] S10S20S30S40S50Tensile strength (MPa)50.2147.5851.2352.1251.39Elongation (%)39.2437.1239.5940.1440.25Elastic modulus (MPa)1800170181018801855

[0205] 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.

[0206] Experimental Example 2

[0207] Antibacterial effect experiment

[0208] 10 using Pseudomonas aeruginosa as a strain 6 The photocurable compositions of Examples 1 to 4 were inoculated onto specimens printed using a 3D printer, and the amount of microorganisms was confirmed to measure the antibacterial activity.

[0209] By measurement criteria, the amount of microorganisms is 10 3 The following cases were evaluated as having excellent antibacterial properties, and the amount of microorganisms was 10 5 In the following cases, the antibacterial effect was judged to be minimal.

[0210] As a result of the experiment, Example 1 had a microorganism content of 10 5 As confirmed below, it was analyzed that the antibacterial effect against harmful microorganisms was minimal, but other examples 2 to 5 showed an amount of 10 microorganisms. 3 It was confirmed that excellent antibacterial effects were observed in the following cases.

[0211] 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

1. Includes a shape portion printed with 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.

2. In paragraph 1, The above shape portion includes shapes corresponding to the wearer's 31st and 41st teeth, The shape corresponding to the teeth 31 and 41 above is combined to prevent breakage due to chewing movement of the teeth and to prevent the teeth of the lower jaw from spreading apart. Retainer.

3. In paragraph 2, The above 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.

4. In paragraph 1, The above retainer is fixed by applying resin to the inside and attaching it to the wearer's teeth. Retainer.

5. In paragraph 1, The above retainer is transparent or is colored to be the same color as the teeth. Retainer.

6. In paragraph 1, 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 the same 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 the same or different and are each independently an integer from 1 to 30, R1 and R2 are the same or different, and can each be independently 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.

7. 3D input stage for receiving 3D information about oral structure; A 3D model generation step of creating multiple 3D models by dividing the central axis of the oral structure into multiple regions with the x-axis as the center 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, 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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