WO2021187786A1 - Procédé de fabrication d'une feuille multicouche pour appareils orthodontiques transparents - Google Patents

Procédé de fabrication d'une feuille multicouche pour appareils orthodontiques transparents Download PDF

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Publication number
WO2021187786A1
WO2021187786A1 PCT/KR2021/002818 KR2021002818W WO2021187786A1 WO 2021187786 A1 WO2021187786 A1 WO 2021187786A1 KR 2021002818 W KR2021002818 W KR 2021002818W WO 2021187786 A1 WO2021187786 A1 WO 2021187786A1
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WO
WIPO (PCT)
Prior art keywords
roll
polymer material
thermoplastic polymer
transparent
orthodontic
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PCT/KR2021/002818
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English (en)
Korean (ko)
Inventor
권두연
임희정
장일석
송주동
Original Assignee
오스템임플란트 주식회사
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Publication of WO2021187786A1 publication Critical patent/WO2021187786A1/fr

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    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61C—DENTISTRY; APPARATUS OR METHODS FOR ORAL OR DENTAL HYGIENE
    • A61C7/00—Orthodontics, i.e. obtaining or maintaining the desired position of teeth, e.g. by straightening, evening, regulating, separating, or by correcting malocclusions
    • A61C7/08—Mouthpiece-type retainers or positioners, e.g. for both the lower and upper arch
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B27/08—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/40—Layered products comprising a layer of synthetic resin comprising polyurethanes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
    • B32B37/06—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the heating method
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
    • B32B37/10—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the pressing technique, e.g. using action of vacuum or fluid pressure
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
    • B32B37/14—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the properties of the layers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
    • B32B37/14—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the properties of the layers
    • B32B37/144—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the properties of the layers using layers with different mechanical or chemical conditions or properties, e.g. layers with different thermal shrinkage, layers under tension during bonding

Definitions

  • the present invention relates to a method for manufacturing a multi-layered sheet for transparent orthodontics, and more particularly, to a transparent orthodontic material necessary for orthodontic procedures. It relates to a method for manufacturing a transparent orthodontic multi-layer sheet that is configured to have a high stability of the orthodontic device and safety when worn by a patient.
  • Orthodontic treatment is a therapeutic action applied to treat irregular tooth arrangement or abnormal interlocking of upper and lower jaws.
  • treatment is performed using brackets and wires for orthodontic treatment, and metal brackets and wires are used to apply orthodontic force to teeth.
  • metal brackets and wires they are not aesthetically good, and since treatment is carried out by fixing them to the teeth, there is a disadvantage that more attention should be paid to the cleanliness of the oral cavity.
  • the transparent orthodontic device is used for treatment by molding a polymer sheet to suit the patient's oral cavity through vacuum thermoforming.
  • Most of the conventional polymer sheets are composed of polyethylene terephthalate glycol (PETG).
  • PETG polyethylene terephthalate glycol
  • Transparent orthodontic devices made of conventional polymer sheets, including PETG have a characteristic that the pain applied to the patient at the initial stage of wearing the device is great, and the orthodontic force applied to the teeth decreases over time. This causes discomfort and pain to the patient, and gives the teeth a lower orthodontic force unlike the initial one, resulting in tooth movement that does not match the predicted results.
  • a multi-layer sheet (Polyester-TPU) has been developed to improve this, but there is a disadvantage in that the interlayer bonding strength is weak due to the difference in thermal properties. Due to this, delamination occurs when applying orthodontic products, which causes performance degradation, and the peeled layer exists in the patient's mouth or enters the digestive tract, affecting patient safety. Therefore, there is a need for a material with increased long-term stability of the orthodontic device and safety when wearing the device by a patient through improved interlayer bonding.
  • the present invention is to solve the problems of the prior art described above, and an object of the present invention relates to a method for manufacturing a multi-layered sheet for transparent orthodontics, and more particularly, it is a transparent orthodontic material necessary for orthodontic surgery and is composed of multiple layers. It is to provide a method for manufacturing a transparent orthodontic multi-layer sheet that can increase orthodontic retention, reduce patient pain, and increase stability of orthodontic devices and safety when worn by patients by having excellent interlayer bonding and durability.
  • one aspect of the present invention is a step of (a) mounting the soft thermoplastic polymer material in a roll state to the upper roll and the lower roll of the laminator, respectively, (b) the upper roll and the lower roll Raising the temperature, (c) laminating the roll sheets of the soft thermoplastic polymer material mounted on the upper roll and the lower roll in a pressing roll, and (d) laminating the soft thermoplastic polymer material while the soft thermoplastic polymer material is being laminated
  • It provides a method of manufacturing a multi-layer sheet for transparent correction comprising the step of mounting a thermoplastic polymer material on a central roll of a laminator and inserting it into the pressing roll in progress of lamination to prepare a multi-layer sheet.
  • the elevated temperature of the upper roll and the lower roll may be a transparent correction multi-layer sheet manufacturing method, characterized in that 110 to 140 °C.
  • the pressure of the pressing roll may be a method of manufacturing a multi-layer sheet for transparent correction, characterized in that 0.2 to 1.0 KPa.
  • the lamination speed of the pressing roll may be a method of manufacturing a multi-layered sheet for transparent correction, characterized in that 0.5 to 4.5 m/min.
  • the flexible thermoplastic polymer material may be a transparent orthodontic multi-layer sheet manufacturing method, characterized in that the flexible polyurethane.
  • the rigid thermoplastic polymer material may be a method for manufacturing a multi-layer sheet for transparent correction, characterized in that the rigid polyurethane.
  • the flexible thermoplastic polymer material may be a transparent orthodontic multi-layer sheet manufacturing method, characterized in that having a hardness (hardness) of 85 to 95A.
  • the rigid thermoplastic polymer material has a yield strength of 40 MPa or more and 60 MPa or less, and has an elastic modulus (Young's modulus) of 1500 MPa or more and 2200 MPa or less. It may be a method of making a layer sheet.
  • the transparent orthodontic multi-layer sheet manufactured according to the present invention has excellent orthodontic holding power due to less deformation at the tooth deformed position for a long period of time compared to conventional materials, and has excellent durability and safety when wearing the patient due to excellent interlayer bonding strength. can be improved
  • the outer layer is made of a soft polymer material to give flexibility, it is possible to reduce the pain of the patient during the initial correction.
  • the intermediate layer is made of a hard polymer material and has high elastic recovery force, interlayer bonding strength and durability with the outer layer may be improved.
  • FIG. 1 is a perspective view showing a multi-layered sheet for transparent correction manufactured according to an embodiment of the present invention.
  • Figure 2 is a schematic diagram showing a method of manufacturing a multi-layer sheet for transparent correction according to an embodiment of the present invention.
  • FIG. 3 is a flowchart illustrating a method for manufacturing a multi-layer sheet for transparent correction according to an embodiment of the present invention.
  • FIG. 5 is a graph comparing peel strength between a multi-layer sheet for transparent correction manufactured according to an embodiment of the present invention and a conventional material.
  • FIG. 6 is a photograph comparing the recovery rate after deformation between the multi-layer sheet for transparent correction prepared according to an embodiment of the present invention and a conventional material.
  • FIG. 7 is a graph comparing the retention rate of orthodontic force between the multi-layer sheet for transparent correction prepared according to an embodiment of the present invention and a conventional material.
  • FIG. 1 is a perspective view showing a multi-layered sheet for transparent correction manufactured according to an embodiment of the present invention.
  • the transparent orthodontic multi-layer sheet 1000 manufactured according to the present invention has a triple-layer structure including a first outer layer 100 , a second outer layer 200 and an intermediate layer 300 .
  • a first outer layer 100 a first outer layer 100
  • a second outer layer 200 a second outer layer 200
  • an intermediate layer 300 a third layer
  • the transparent orthodontic multi-layer sheet 1000 manufactured according to the present invention differs from the conventional single-layer material sheet by configuring the material of the outer layer in contact with the soft tissue in the oral cavity and the inner layer providing rigidity differently over time. It can reduce discomfort and pain inflicted to the patient while maintaining the corrective power.
  • the first outer layer 100 and the second outer layer 200 constitute the outer layer of the transparent orthodontic multi-layer sheet 1000 and are in contact with the soft tissue in the oral cavity, and may be made of a soft thermoplastic transparent polymer material. That is, the first outer layer 100 and the second outer layer 200 are made of a soft polymer material to give flexibility to the transparent orthodontic multi-layer sheet 1000, and when a deformation force is applied, complex stress acts to provide high correction It can provide holding force and elastic recovery force.
  • the intermediate layer 300 constitutes the inner layer of the transparent orthodontic multi-layer sheet 1000 and provides orthodontic force for tooth movement, and may be made of a rigid thermoplastic transparent polymer material. That is, the intermediate layer 300 is made of a hard polymer material to impart strength to the transparent orthodontic multilayer sheet 1000, and can provide an orthodontic force for applying a force in a direction in which the teeth want to move.
  • the first outer layer 100 and the second outer layer 200 may be made of a flexible thermoplastic polyurethane (TPU).
  • TPU thermoplastic polyurethane
  • Polyurethane has the characteristics of both rubber and plastic, and is a non-toxic material without harmful substances such as environmental hormones and TVOC. In addition, it is an elastic material that does not require a separate plasticizer and has the highest abrasion resistance among thermoplastic elastomers that can be plastically processed by heat.
  • the first outer layer 100 and the second outer layer 200 manufactured according to the present invention are made of a flexible polyurethane having a high strain recovery rate to give flexibility to the transparent orthodontic multi-layer sheet 1000, , it is possible to reduce the pain inflicted on the patient at the initial stage of orthodontic treatment.
  • the first outer layer 100 and the second outer layer 200 manufactured according to the present invention may be configured to have a thickness of 20 ⁇ m or more and 200 ⁇ m or less.
  • the thickness of the first outer layer 100 and the second outer layer 200 is less than 20 ⁇ m, the flexibility of the multi-layer sheet 1000 for transparent correction may be lowered because it cannot sufficiently receive elastic deformation, and the If the thickness of the first outer layer 100 and the second outer layer 200 exceeds 200 ⁇ m, the thickness of the transparent orthodontic multi-layer sheet 1000 may become too thick, and thus the patient's wearing comfort may be reduced.
  • the first outer layer 100 and the second outer layer 200 are preferably configured to have a hardness of 60A or more and 100A or less. If the hardness of the first outer layer 100 and the second outer layer 200 is less than 60A, there is a fear that sufficient strength for maintaining orthodontic force may not be provided when in contact with the teeth, and if it exceeds 100A, the strength of the outer layer is excessively increased Therefore, it may not provide sufficient elasticity, and the pain relief of the patient may be reduced.
  • the intermediate layer 300 may be made of rigid thermoplastic polyurethane (TPU).
  • transparent polymer materials such as PET, PE, and PC were used as materials for securing corrective power, that is, strength as materials for interlayer materials.
  • PET PET
  • PE PE
  • PC PC
  • the intermediate layer 300 manufactured according to the present invention is made of a hard polyurethane to improve durability by increasing interlayer bonding strength with the first outer layer 100 and the second outer layer 200.
  • Multi-layer sheet for transparent correction (1000) It is possible to impart rigidity and a high rate of deformation recovery to the tooth, thereby providing improved orthodontic force.
  • the intermediate layer 300 manufactured according to the present invention may be configured to have a thickness of 200 ⁇ m or more and 1500 ⁇ m or less. At this time, if the thickness of the intermediate layer 300 is less than 200 ⁇ m, it may be difficult to secure sufficient strength for maintaining the corrective force, and if the thickness of the intermediate layer 300 exceeds 1500 ⁇ m, the thickness of the transparent orthodontic multi-layer sheet 1000 is too thick. This may reduce the patient's wearing comfort.
  • the intermediate layer 300 is preferably configured to have a yield strength of 40 MPa or more and 60 MPa or less, and a Young's modulus of 1500 MPa or more and 2200 MPa or less. If the yield strength of the intermediate layer 300 is less than 40 MPa and the modulus of elasticity is less than 1500 MPa, it may not be possible to provide sufficient elastic deformation, so it may be difficult to provide sufficient mechanical strength for securing corrective force, the yield strength is more than 60 MPa and the modulus of elasticity is more than 2200 MPa It can be difficult to relieve pain in patients in the early stages of orthodontic treatment.
  • the intermediate layer 300 may be configured to have a transmittance of 93% or more and 97% or less.
  • the transparent orthodontic sheet 1000 manufactured according to the present invention is composed of multiple layers of soft polyurethane and rigid polyurethane having similar thermal properties, thereby increasing orthodontic retention, reducing patient pain, and providing excellent interlayer bonding strength. As a result, durability is improved and safety can be increased when worn by patients.
  • Figure 2 is a schematic diagram showing a method of manufacturing a multi-layer sheet for transparent correction according to an embodiment of the present invention
  • Figure 3 is a flowchart showing a method for manufacturing a multi-layer sheet for transparent correction according to an embodiment of the present invention am.
  • the present invention is a step of mounting the soft thermoplastic polymer material 100, 200 in a roll state to the upper roll 10 and the lower roll 20 of the laminator, respectively (S100), the upper roll (10) and raising the temperature of the lower roll 20 (S200), pressing the roll sheet of the soft thermoplastic polymer material 100, 200 mounted on the upper roll 10 and the lower roll 20 Lamination after bonding in the roll 30 (S300) and while the soft thermoplastic polymer materials 100 and 200 are being laminated, the rigid thermoplastic polymer material 300 is mounted on the center roll 40 of the laminator and lamination is in progress. It is possible to provide a method for manufacturing a multi-layer sheet for transparent correction comprising the step (S400) of manufacturing the multi-layer sheet 1000 by putting it in the compression roll 30 .
  • the method of manufacturing a multi-layer sheet for transparent correction of the present invention may be performed by a lamination process.
  • lamination refers to a technology that protects the surface and increases strength and stability by overlaying one or more thin layers on the target object.
  • the laminator used in the present invention is configured to include an upper roll 10 , a lower roll 20 , a pressing roll 30 and a center roll 40 .
  • the upper roll 10 and the lower roll 20 provide a soft thermoplastic polymer material in a roll state
  • the center roll 40 provides a hard thermoplastic polymer material in a roll state
  • the compression roll 30 provides the soft thermoplastic polymer material in a roll state. Compress the thermoplastic polymer material and the rigid thermoplastic polymer material to bond them together.
  • the soft thermoplastic polymer materials 100 and 200 in a roll state are mounted on the upper roll 10 and the lower roll 20 of the laminator, respectively ( S100).
  • the elevated temperature of the upper roll and the lower roll is characterized in that 110 to 140 °C.
  • the bonding strength between the soft thermoplastic polymer material and the hard thermoplastic polymer material may be reduced, and if it exceeds 140 °C, the soft The quality of the transparent orthodontic multi-layer sheet prepared by partially melting the thermoplastic polymer material or the rigid thermoplastic polymer material may deteriorate.
  • the soft thermoplastic polymer materials 100 and 200 in the form of a roll sheet mounted on the upper roll 10 and the lower roll 20 are laminated after bonding in the pressing roll 30 (S300).
  • the pressure of the compression roll 30 is characterized in that 0.2 to 1.0 KPa. If the pressure of the compression roll 30 is less than 0.2 KPa, sufficient compression between the soft thermoplastic polymer materials 100 and 200 and the hard thermoplastic polymer material 300 may not be made, so that the peel strength may decrease, and if it exceeds 1.0 KPa The thickness of the manufactured multi-layer sheet for transparent orthodontic treatment is too thin, so that a sufficient thickness cannot be secured when manufacturing a transparent orthodontic device, and product performance may be deteriorated.
  • the lamination speed of the pressing roll 30 is characterized in that 0.5 to 4.5 m / min. If the lamination speed is less than 0.5 m/min, the manufacturing efficiency may decrease when manufacturing the multi-layer sheet for transparent correction, and if it exceeds 4.5 m/min, sufficient compression time by the pressing roll 30 cannot be secured, resulting in a decrease in interlayer peel strength can be
  • the rigid thermoplastic polymer material 300 is mounted on the center roll 40 of the laminator and inserted into the pressing roll 30 in the process of lamination to insert a multi-layer sheet ( 1000) is prepared (S400).
  • thermoplastic polymer material As such, through the manufacturing method of the present invention, it is possible to manufacture a transparent orthodontic multilayer sheet with improved interlaminar peel strength while the soft thermoplastic polymer material and the rigid thermoplastic polymer material have an effective thickness for performance as a transparent orthodontic material.
  • the first outer layer 100 and the second outer layer 200 of the transparent orthodontic multi-layer sheet 1000 used in the experiment were made of soft polyurethane, and the middle layer 300 was made of rigid polyurethane. .
  • the outer layer of the conventional material is made of flexible polyurethane, and the inner layer is configured to be made of hard polyester.
  • the universal testing machine is an experimental instrument that applies stress to the material to find out the most basic mechanical properties of the polymer material, and then measures the resulting strain to find out the physical properties of the material.
  • There are various types of experiments such as tensile, peeling, and bending.
  • the LOAD value is measured until the specimen deforms with respect to that force. Since the detailed experimental method is a known fact, it will be omitted.
  • the conventional material was measured to have a yield strength of about 30 MPa to 40 MPa and an elastic modulus of 1500 MPa to 1700 MPa
  • the transparent orthodontic multilayer sheet 1000 prepared according to the present invention is about 40 MPa to 60 MPa It was measured to have a yield strength of 1200 MPa and an elastic modulus of 2000 MPa.
  • the transparent orthodontic multi-layer sheet 1000 of the present invention allows greater elastic deformation compared to conventional materials, thereby reducing pain applied to the patient at the initial stage of orthodontic treatment and improving safety when wearing the patient.
  • FIG. 5 is a graph comparing peel strength between a multi-layer sheet for transparent correction manufactured according to an embodiment of the present invention and a conventional material.
  • the multi-layer sheet 1000 for transparent calibration prepared according to the present invention and a specimen including a surface where the outer layer and the middle layer are not bonded to the conventional material were prepared, and the peel strength was measured with a universal tester.
  • the conventional material was measured to have a peel strength of about 0.1N/cm to 0.15N/cm
  • the transparent orthodontic multilayer sheet 1000 prepared according to the present invention was about 0.2N/cm It was measured to have more than peel strength.
  • the transparent orthodontic multi-layer sheet 1000 manufactured according to the present invention has a peel strength of about 2 to 3 times that of a conventional material, thereby improving interlayer bonding strength, thereby preventing the occurrence of an interlayer peeling phenomenon. Accordingly, it is possible to prevent performance degradation due to the peeling phenomenon and the peeling layer being present in the patient's oral cavity or flowing into the digestive tract, thereby compromising the safety of the patient.
  • FIG. 6 is a photograph comparing the recovery rate after deformation between the multi-layer sheet for transparent correction prepared according to an embodiment of the present invention and a conventional material
  • FIG. 7 is a multi-layer for transparent correction prepared according to an embodiment of the present invention. It is a graph comparing the retention rate of orthodontic force between the sheet and the conventional material.
  • the multilayer sheet 1000 for transparent correction prepared according to the present invention and the conventional material were manufactured as a 1X8cm specimen, and the amount of change for 24 hours after bending was measured.
  • Figure 6 in the case of the conventional material, it can be seen that the recovery rate after deformation is relatively low because a relatively large angle is maintained for 24 hours after bending. ), it can be seen that the recovery rate after deformation is relatively large, as it was recovered almost similar to the initial state for 24 hours after bending.
  • the transparent orthodontic multi-layer sheet 1000 and the conventional material prepared according to the present invention were manufactured as a specimen for measuring flexural strength, and the orthodontic force retention rate was measured through the strain recovery rate using a universal testing machine.
  • the corrective force decreases relatively quickly with time, and the corrective force decreases significantly after a certain period of time, and in the case of the transparent orthodontic multilayer sheet 1000 of the present invention It can be seen that the corrective force decreases with time relatively slowly, so that the corrective force is maintained at a certain level even after a certain period of time.
  • the transparent orthodontic multilayer sheet 1000 manufactured according to the present invention has excellent orthodontic holding power due to less deformation at the tooth deformed position compared to the conventional material, and excellent interlayer bonding strength, so durability and safety when worn by a patient can be improved. have.

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  • Health & Medical Sciences (AREA)
  • Oral & Maxillofacial Surgery (AREA)
  • Dentistry (AREA)
  • Epidemiology (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Animal Behavior & Ethology (AREA)
  • General Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Veterinary Medicine (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Dental Tools And Instruments Or Auxiliary Dental Instruments (AREA)

Abstract

Selon un mode de réalisation, la présente invention fournit un procédé de fabrication d'une feuille multicouche pour appareils orthodontiques transparents, comprenant les étapes consistant : (a) à monter un matériau polymère thermoplastique souple roulé sur un rouleau supérieur et un rouleau inférieur d'un dispositif de stratification ; (b) à augmenter la température du rouleau supérieur et du rouleau inférieur ; (c) à lier la feuille roulée de matériau polymère thermoplastique souple, qui est montée sur le rouleau supérieur et le rouleau inférieur, sur des rouleaux presseurs, et ensuite à les stratifier ; et (d) à monter un matériau polymère thermoplastique dur sur un rouleau central du dispositif de stratification durant la stratification du matériau polymère thermoplastique souple, afin de l'insérer entre les rouleaux presseurs effectuant la stratification, et ainsi une feuille multicouche est fabriquée.
PCT/KR2021/002818 2020-03-19 2021-03-08 Procédé de fabrication d'une feuille multicouche pour appareils orthodontiques transparents WO2021187786A1 (fr)

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KR1020200033664A KR102436487B1 (ko) 2020-03-19 2020-03-19 투명 교정용 다중층 시트 제조 방법
KR10-2020-0033664 2020-03-19

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KR102592634B1 (ko) * 2022-09-06 2023-10-23 주식회사 덴티스 복합 구조의 치과용 교정 시트 및 이를 이용한 치과용 교정 장치

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KR20110074190A (ko) * 2009-12-24 2011-06-30 김진영 다층필름 제조방법
WO2013190580A1 (fr) * 2012-06-21 2013-12-27 Balsport Solutions S.L. Procédé de fabrication de dispositifs dentaires et dispositif dentaire
US20190105881A1 (en) * 2017-05-31 2019-04-11 Bay Materials, Llc Dual shell dental appliance and material constructions
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CN207666718U (zh) * 2017-02-07 2018-07-31 苏州博理新材料科技有限公司 一种隐形矫治专用tpu复合膜片

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KR20110074190A (ko) * 2009-12-24 2011-06-30 김진영 다층필름 제조방법
US20190183611A1 (en) * 2012-05-14 2019-06-20 Align Technology, Inc. Multilayer dental appliances and related methods and systems
WO2013190580A1 (fr) * 2012-06-21 2013-12-27 Balsport Solutions S.L. Procédé de fabrication de dispositifs dentaires et dispositif dentaire
US20190105881A1 (en) * 2017-05-31 2019-04-11 Bay Materials, Llc Dual shell dental appliance and material constructions

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KR102436487B1 (ko) 2022-08-26

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