Photocurable composition for 3D printer for producing transparent orthodontic device

Abstract

The present invention pertains to a photocurable composition for a 3D printer for producing a transparent orthodontic device. A photocurable composition for a 3D printer can be provided, which has excellent physical properties such as thermal properties, strength, elastic modulus, and tensile elongation, and when used in a patient-customized transparent orthodontic device, the orthodontic device can reduce the pain felt by patients and can enhance orthodontic correction effectiveness due to being closely fitted to the dental structure. Moreover, a 3D-printed transparent orthodontic device can be produced which can be restored to the original shape thereof even when deformed from use.

Claims

1. A photocurable composition for 3D printing for producing a transparent orthodontic device, the composition comprising: a UV-curable polyurethane oligomer represented by the following Formula 6 or 7; a photoinitiator a silane coupling agent: an oligomer; and a stabilizer: ##STR00008## wherein A and A′ are each a substituent represented by Formula 2 above, and n′, m′, o′, p′, q′, and r′ are the same as or different from each other, and are each independently an integer of 1 to 100.

2. The photocurable composition of claim 1, wherein the transparent orthodontic device using the photocurable composition for 3D printing has an elastic modulus of 1,500 to 2,000 N/m.sup.2, a tensile strength of 40 to 50 N/m2, and a flexural strength of 45 to 55 N/m.sup.2.

3. The photocurable composition of claim 1, wherein the transparent orthodontic device using the photocurable composition for 3D printing is capable of being restored to the original shape thereof in the range of 40 to 80° C.

4. The photocurable composition of claim 1, wherein the UV-curable polyurethane oligomer has a weight average molecular weight of 10,000 to 1,000,000.

5. The photocurable composition of claim 1, wherein the photoinitiator is a compound represented by the following Formula 5: ##STR00009##

6. The photocurable composition of claim 1, wherein the oligomer is selected from the group consisting of an epoxy acrylate oligomer, H.sub.12 dian-bis-glycidyl ether (4,4′-(1-methylethylidene)biscyclohexanol, polymer with (chloromethyl)oxirane), and a mixture thereof.

7. The photocurable composition of claim 1, wherein the stabilizer is selected from the group consisting of 2,6-di-tert-butyl-p-cresol, diethylethanolamine, trihexylamine, hindered amine, organic phosphate, hindered phenol, and a mixture thereof.

8. A transparent orthodontic device, comprising the photocurable composition for 3D printing of claim 1.

Description

BRIEF DESCRIPTION OF DRAWINGS

(1) FIG. 1 illustrates a photograph of a 3D printed product using a polymer composition according to an embodiment of the present disclosure.

(2) FIG. 2 illustrates a 3D model for producing a transparent orthodontic device according to an embodiment of the present disclosure.

(3) FIG. 3 illustrates a 3D model of a transparent orthodontic device according to an embodiment of the present disclosure, which is a 3D model in which a 3D-printer structure is formed instead of a wire.

(4) FIG. 4 illustrates a 3D model of a transparent orthodontic device according to an embodiment of the present disclosure, which is a 3D model configured to allow the addition of a connection device such as a wire in a portion.

(5) FIG. 5 illustrates a 3D model of a transparent orthodontic device according to an embodiment of the present disclosure, which is a 3D model in which a 3D printer structure capable of serving as a wire is formed in a portion.

(6) FIG. 6 illustrates a 3D model of a transparent orthodontic device according to an embodiment of the present disclosure, which is a 3D model whose portion is thick.

(7) FIG. 7 illustrates a 3D model of a transparent orthodontic device according to an embodiment of the present disclosure, which is a 3D model in which a hole for indirect bonding is formed.

(8) FIG. 8 illustrates a 3D model of a transparent orthodontic device according to an embodiment of the present disclosure, which is a 3D model in which both a wire and indirect bonding are formed.

BEST MODE

(9) The present disclosure relates to a photocurable composition for 3D printing for producing a transparent orthodontic device, the composition comprising a UV-curable polyurethane oligomer; a photoinitiator; a silane coupling agent; an oligomer; and a stabilizer.

MODE FOR INVENTION

(10) Hereinafter, embodiments of the present disclosure will be described in detail so as to be easily carried out by those of ordinary skill in the art to which the present disclosure pertains. However, the present disclosure may be implemented in various different forms and is not limited to examples described herein.

Preparation Example: Preparation of Photocurable Polymer Composition for 3D Printing

(11) A photocurable polymer composition for 3D printing was prepared by mixing a UV-curable polyurethane oligomer represented by the following Formula 6 or Formula 7; a photoinitiator represented by the following Formula 5; 3-methacryloxypropyltrimethoxysilane; an epoxy acrylate oligomer; and 2,6-di-tert-butyl-p-cresol. The oligomer, etc. used in the preparation of the polymer composition, were purchased, and the contents of the components are shown in Table 1 below.

(12) ##STR00007##

(13) wherein

(14) A and A′ are each a substituent represented by Formula 2, and

(15) n′, m′, o′, p′, q′, and r′ are the same as or different from each other, and are each independently an integer of 1 to 100.

(16) TABLE-US-00001 TABLE 1 S10 S20 S30 S40 S50 S60 S70 S80 Formula 6 100 100 100 100 100 100 — — Formula 7 — — — — — — 100 100 Photo- 1 1.5 5 10 15 20 10 15 initiator Silance 0.05 0.1 0.5 1 1.5 2 1 1.5 coupling agent Oligomer 10 15 25 30 45 50 30 45 Stabilizer 0.05 0.1 0.5 1 2 3 1 2 (unit: parts by weight)

Experimental Example: Experiment for Evaluation of Physical Properties

(17) 1. Test conditions

(18) 1-1. Tensile Test

(19) Test method: ASTM D638

(20) Testing instrument: Universal Testing Machine

(21) Test speed: 50 mm/min

(22) Distance between grips: 115 mm

(23) Load cell: 3,000 N

(24) Elasticity range: (0.05˜0.25)%

(25) Yield point: 0.2% offset

(26) Test environment: (23±2)° C., (50±5)% R.H.

(27) 1-2. Flexural Test

(28) Test method: ASTM D790

(29) Testing instrument: Universal Testing Machine

(30) Test speed: 1.4 mm/min

(31) Distance between spans: 55 mm

(32) Load cell: 200 N

(33) Elasticity section: (0.05˜0.25)%

(34) Test environment: (23±2)° C., (50±5)% R.H.

(35) 1-3. Heat Deflection Temperature

(36) Test method: ASTM D648

(37) Test load: 0.45 MPa

(38) Heating rate: 2° C./min

(39) 2. Test Results

(40) The experiment was conducted by the Korea Polymer Testing & Research Institute. The specimens were obtained from the polymer compositions of S10 to S80 in Table 1 above as a specimen of FIG. 1 by printing using a 3D printer.

(41) For S10 to S80, a tensile test and a flexural test were performed, and the results are shown in Tables 2 and 3 below. The heat deflection temperature was measured.

(42) TABLE-US-00002 TABLE 2 S10 S20 S30 S40 S50 S60 S70 S80 Maximum 1659.23 1752.34 1955.11 2224.92 2234.82 1827.21 2251.64 2244.52 load (N) Tensile 46.21 47.11 47.12 49.38 50.21 47.58 51.23 52.12 strength (N/m.sup.2) Yield 46.15 46.78 47.11 49.38 51.21 47.21 51.64 52.12 strength (N/m.sup.2) Elongation 36.98 37.10 37.59 38.35 39.24 37.12 39.59 40.14 (%) Elastic 1498.23 1545.54 1588.54 1621.31 1622.25 1521.54 1644.25 1646.19 modulus (N/m.sup.2)

(43) TABLE-US-00003 TABLE 3 S10 S20 S30 S40 S50 S60 S70 S80 Maximum 94.1 95.4 96.1 96.3 97.1 95.2 98.4 98.6 load (N) Flexural 48.4 48.9 49.2 50.3 51.2 48.1 51.8 52.1 strength (N/m.sup.2) Strain (%) 10.12 10.98 10.95 11.04 11.05 10.85 12.01 12.12 Flexural 1201.14 1204.12 1204.46 1205.74 1207.45 1201.58 1211.14 1212.44 modulus (N/m.sup.2)

(44) From the tensile test and flexural test results in Tables 2 and 3 above, it was confirmed that the photocurable composition according to the present disclosure exhibited excellent tensile strength, flexural strength, elastic modulus, yield strength, elongation, and strain.

(45) The results of measuring the heat deflection temperature for S10 to S80 are shown in Table 4 below.

(46) TABLE-US-00004 TABLE 4 S10 S20 S30 S40 S50 S60 S70 S80 Heat 32.1 52.5 57.6 60.5 62.1 92.6 56.2 57.4 deflection temperature (unit: ° C.)

(47) (unit: ° C.)

(48) From Table 4 above, it was confirmed that deformation occurred at the hot water temperature (50 to 70° C.) of a water purifier, which is generally and easily accessible, even in the heat deflection temperature range, so that the shape restoration was easy.

(49) Although the preferred embodiments of the present disclosure have been described above in detail, the scope of the present disclosure is not limited thereto. Various modifications and improvements, which are made by those skilled in the art without departing from the basic concept of the present disclosure as defined in the appended claims, also fall within the scope of the present disclosure.

INDUSTRIAL APPLICABILITY

(50) The present disclosure relates to a photocurable composition for 3D printing for producing a transparent orthodontic device, and more particularly, to a photocurable composition for 3D printing capable of producing a transparent orthodontic device that is not visually recognized well from the outside because the transparent orthodontic device is made of a transparent material, and may be easily restored to the original shape thereof and reused even if the state of the orthodontic device changes by use because the orthodontic device is restored to the original shape thereof by heat.