CN113367814A - Method for manufacturing direct-bonding type transparent appliance accessory through digital 3D printing - Google Patents

Method for manufacturing direct-bonding type transparent appliance accessory through digital 3D printing Download PDF

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CN113367814A
CN113367814A CN202110705029.XA CN202110705029A CN113367814A CN 113367814 A CN113367814 A CN 113367814A CN 202110705029 A CN202110705029 A CN 202110705029A CN 113367814 A CN113367814 A CN 113367814A
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accessory
accessories
digital
printing
manufacturing
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CN113367814B (en
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张�浩
金作林
高洁
徐秋
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Air Force Medical University of PLA
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Air Force Medical University of PLA
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    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61CDENTISTRY; APPARATUS OR METHODS FOR ORAL OR DENTAL HYGIENE
    • A61C7/00Orthodontics, i.e. obtaining or maintaining the desired position of teeth, e.g. by straightening, evening, regulating, separating, or by correcting malocclusions
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C64/00Additive manufacturing, i.e. manufacturing of three-dimensional [3D] objects by additive deposition, additive agglomeration or additive layering, e.g. by 3D printing, stereolithography or selective laser sintering
    • B29C64/10Processes of additive manufacturing
    • B29C64/106Processes of additive manufacturing using only liquids or viscous materials, e.g. depositing a continuous bead of viscous material
    • B29C64/124Processes of additive manufacturing using only liquids or viscous materials, e.g. depositing a continuous bead of viscous material using layers of liquid which are selectively solidified
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C64/00Additive manufacturing, i.e. manufacturing of three-dimensional [3D] objects by additive deposition, additive agglomeration or additive layering, e.g. by 3D printing, stereolithography or selective laser sintering
    • B29C64/30Auxiliary operations or equipment
    • B29C64/386Data acquisition or data processing for additive manufacturing
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B33ADDITIVE MANUFACTURING TECHNOLOGY
    • B33YADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3-D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3-D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING
    • B33Y10/00Processes of additive manufacturing
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B33ADDITIVE MANUFACTURING TECHNOLOGY
    • B33YADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3-D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3-D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING
    • B33Y50/00Data acquisition or data processing for additive manufacturing
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29LINDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2031/00Other particular articles
    • B29L2031/753Medical equipment; Accessories therefor

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Health & Medical Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Optics & Photonics (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)
  • Dental Tools And Instruments Or Auxiliary Dental Instruments (AREA)

Abstract

The invention discloses a method for manufacturing direct-bonded transparent appliance accessories by digital 3D printing, which belongs to the technical field of orthodontic treatment, wherein accessories with different shapes and sizes are manufactured in advance by using a 3D printing three-dimensional forming technology, then the prefabricated accessories are bonded on tooth surfaces needing to be added in the orthodontic design, then teeth with the accessories are scanned, the teeth with the accessories are used as models, invisible appliances are printed by the combination of SLA (stereo stereolithography) and the three-dimensional stereo of a computer, and then the invisible appliances are bonded on the teeth with the accessories. Compared with the direct method of adding the accessory to be used only in the existing invisible correction technology, the method has the advantages that the clinical operation convenience and the patient experience are greatly improved, the accessory precision and the wear resistance can be obviously improved, the falling rate is reduced, the control of the invisible corrector on teeth is enhanced, and the invisible correction effect is improved.

Description

Method for manufacturing direct-bonding type transparent appliance accessory through digital 3D printing
Technical Field
The invention relates to the technical field of orthodontic, in particular to a method for manufacturing a direct-bonded transparent appliance accessory through digital 3D printing.
Background
In the development history of the orthodontic technology, the appearance of the bracket-free invisible orthodontic technology has epoch-making symbolic meanings, compared with the traditional orthodontic device, the invisible orthodontic device is more attractive and comfortable and is easy to maintain oral health, the rapid development is achieved in recent years, the accessory is one of the most important components, the accessory plays a vital role in effectively moving teeth of the orthodontic device, however, the current method for directly molding the accessory by using the light-cured resin clinically has higher requirements on the clinical operation technology of doctors, the molded accessory has lower precision and poorer wear resistance, and the tooth surface enamel is extremely easy to be damaged in the trimming process.
Disclosure of Invention
1. Technical problem to be solved
The invention provides a method for manufacturing a direct-bonding type transparent appliance accessory through digital 3D printing, which is used for solving the technical problem brought forward by the technical background. The invention aims to manufacture a pre-formed orthodontic transparent film pressing appliance accessory by utilizing digital virtual design and a 3D printing technology and to manufacture a corresponding clinical operation flow. Compared with the existing attachment manufacturing and bonding mode, the invention creates innovation in the attachment manufacturing and clinical operation process, greatly reduces the clinical operation difficulty, shortens the clinical operation time, obviously reduces the possibility of iatrogenic damage, obviously enhances the accuracy, the wear resistance and the long-term stability of the appliance attachment, and enhances the long-term control capability of the invisible appliance on teeth, thereby realizing more effective and accurate correction effect.
2. Technical scheme
In order to realize the purpose, the invention provides the following technical scheme:
the method for manufacturing the direct-bonding transparent appliance accessory through digital 3D printing comprises the following steps:
step 1, designing accessories: carrying out intraoral scanning on a patient, carrying out three-dimensional virtual tooth arrangement, designing a moving step and a tooth moving scheme, and determining a tooth position for placing an accessory and the shape of the accessory according to the tooth moving scheme;
step 2, manufacturing accessories: designing a three-dimensional shape of the accessory by using computer software, and then manufacturing the resin accessory by using 3D printing equipment by using photosensitive resin as a raw material;
step 3, adhering accessories: and (3) adhering the printed accessory to the enamel surface of the specific tooth according to the scheme designed in the step 1.
Step 4, transferring accessories: carrying out intraoral scanning on the dentition adhered with the accessories to obtain a three-dimensional digital dentition image with accessory forms,
step 5, manufacturing a step-by-step model: fitting the digital dentition model with the accessories with the digital model of the same dentition without the accessories adhered before, transferring the tooth movement scheme to the digital virtual dentition with the accessories to obtain a new step-by-step digital dentition three-dimensional image, and performing 3D printing;
step 6, manufacturing the appliance: and (3) carrying out hot-press molding on the high polymer material membrane by using the printed step model to prepare the bracket-free invisible appliance with the accessory vacuole, and delivering the bracket-free invisible appliance to a patient to wear after cleaning.
Further, in the step 1, digital orthodontic software is specifically used for designing the moving direction and the moving speed of each tooth, extracting the whole surface of the dental crown above the gingival margin of the dentition, designing a tolerance of 30-50 microns, and then forward offsetting the whole body by 2-4 mm.
Furthermore, the shape of the accessory in the step 2 is a cube with different volumes, the corners are round and blunt, the inner side bonding surface is a concave inner arc surface, tiny transverse and longitudinal ribs are arranged on the inner side bonding surface, the center of the outer side surface is provided with a cylindrical bulge with the height of 3mm and the diameter of 1mm, and the cylindrical bulge is used for clamping.
Further, the process of manufacturing the resin accessory in step 2 specifically comprises: the method comprises the steps of using a 3D printing device to emit laser with specific wavelength and intensity to focus on the surface of a light-cured material, enabling the laser to be sequentially solidified from point to line and from line to surface to complete drawing operation of one layer, moving the height of one layer of the laser in the vertical direction by a lifting platform or a printing spray head, then solidifying the other layer of the laser, forming a three-dimensional entity in a layer-by-layer mode by overlapping, controlling an ultraviolet laser stone device to be solidified and formed layer by layer through a computer, and fully automatically manufacturing the resin accessory with high surface quality and dimensional accuracy and complex geometric shape.
Further, the 3D printing equipment adopts a UVLED mixed light source of 365nm +460nm when printing.
3. Advantageous effects
1. In the step 2 of the invention, SLA (stereo photo-curing molding) is combined with the three-dimensional design of a computer, so that the three-dimensional graph with a specific shape and size designed in the computer can be printed; in the process of designing and manufacturing the bracket-free invisible orthotic device, the dentition three-dimensional data obtained by mouth scanning is virtually aligned in software, and then high-precision (16yum) 3D printing three-dimensional forming is carried out, so that the model has higher precision and strength compared with the traditional plaster model, and is very suitable for manufacturing personalized three-dimensional structures with higher requirements on strength and precision.
2. Compared with the existing direct method in which the accessory is added and uniquely used in the invisible correction technology, the invisible correction device has the advantages that the operation convenience, the accessory quality, the stability and the patient experience are greatly improved, the iatrogenic injury probability is obviously reduced, the control of the invisible correction device on teeth can be obviously improved, and the level of the invisible correction technology is improved.
3. According to the invention, the prefabricated accessory in a certain form is adhered to the corresponding tooth, then the tooth with the accessory is taken as a model, the invisible appliance is printed out by the combination of SLA (stereo photocuring forming method) and computer three-dimensional, and then the invisible appliance is adhered to the tooth with the accessory, the adding mode of the accessory in the invisible appliance has simple operation steps and good installation effect, and the defects that the existing invisible appliance filled with the resin material to be solidified is filled in the invisible appliance and the invisible appliance filled with the resin material is worn on the tooth for photocuring in the accessory adding process are avoided, such as:
(1) bubbles are easily generated when resin is filled;
(2) the template can not be attached to each tooth surface uniformly and tightly;
(3) the operation time of the light-cured resin is limited, and the bonding force is obviously reduced when more accessories are bonded at one time;
(3) when the template is removed after the resin is cured, the template is difficult to remove, and the accessory is easy to dislocate;
(4) great difficulty in finishing the edges of the residual resin and accessories and susceptibility to damage to the surrounding enamel;
(5) the accessories of the light-cured composite resin material are worn significantly after a period of time due to continuous removal of the invisible appliance and chewing, brushing and the like.
4. According to the invention, the shape of the tooth of the attachment can be installed as required, the attachment matched with the tooth can be manufactured, so that the invisible appliance can be stably clamped on the tooth and has a good correction effect on the tooth, in addition, the edge of the attachment is arranged in a round blunt manner, so that the invisible appliance can be smoothly clamped on the tooth, the bonding surface on the inner side of the attachment is a concave inward arc surface, the inner arc surface is provided with micro transverse and longitudinal ribs, the bonding agent between the attachment and the adhered tooth can be increased through the inner arc surface, the attachment can be fixed on the surface of the tooth in a relatively stable state after the bonding agent is solidified, and the effective contact area between the bonding agent and the bonding surface of the attachment can be increased through the arrangement of the micro transverse and longitudinal ribs on the inner arc surface, so that the adhesion effect of the bonding agent on the attachment is improved.
5. The invisible appliance is clamped on the teeth through the accessories, and the invisible appliance is ensured to be clamped on the teeth in a relatively stable state through the interaction of the constraint force and the friction force between the invisible appliance and the accessories and between the invisible appliance and the teeth so as to ensure the correction effect of the invisible appliance on the teeth.
Drawings
FIG. 1 is a flow chart of a method for making the attachment and the orthosis of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples.
Examples
As shown in fig. 1, the method for manufacturing the direct-bonded transparent appliance accessory by digital 3D printing is to use a 3D printing stereo-forming technology to manufacture the accessories with different shapes and sizes in advance, then bond the pre-manufactured accessories on the tooth surface needing to be added with the accessories in the appliance design, then scan the teeth with the accessories, use the teeth with the accessories as a model, print out the invisible appliance by the combination of SLA (stereo light curing molding) and the computer three-dimensional body, and then bond the invisible appliance on the teeth with the accessories, and the specific clinical design and operation flow comprises the following steps:
step 1, designing accessories: carrying out intraoral scanning on a patient, carrying out three-dimensional virtual tooth arrangement, designing the moving direction and the moving speed of each tooth by using digital orthodontic software, extracting the whole surface of a dental crown above the gingival margin of a dentition, designing a tolerance of 30-50 microns, then carrying out forward bias on the whole body by 2-4 mm, and determining the tooth position for placing an accessory and the shape of the accessory according to a tooth moving scheme;
step 2, manufacturing accessories: the three-dimensional shape of the accessory is designed by computer software, the accessory is a cube with different volumes, the corners are round and blunt, the inner bonding surface is a concave inward cambered surface, the inner bonding surface is provided with micro transverse and longitudinal ribs, the center of the outer side surface is provided with a cylindrical bulge with the height of 3mm and the diameter of 1mm for clamping, then using photosensitive resin as raw material, using 3D printing equipment to emit laser with specific wavelength and intensity, focusing it on the surface of light-cured material, making it be solidified from point to line and from line to surface so as to implement a layer drawing operation, then the lifting platform or the printing nozzle moves the height of one layer in the vertical direction, and then the other layer is solidified, thus a three-dimensional entity is formed by stacking layer by layer, the computer controls the ultraviolet laser stone device to solidify and form layer by layer, fully automatically manufacture the resin accessories with higher surface quality and dimensional precision and complex geometric shape, the 3D printing equipment adopts a 365nm +460nm UVLED mixed light source during printing; the invention can be provided with the accessory teeth according to the needs, and the accessory matched with the accessory teeth can be manufactured to ensure that the invisible appliance can be stably clamped on the teeth and has good orthodontic effect on the teeth, in addition, the accessories are provided with a plurality of functional planes, and the corners are arranged in a round and blunt way, so that the invisible appliance can be helped to better control the teeth, meanwhile, the resistance when the belt is taken off is reduced, the bonding surface at the inner side of the accessory is a concave inward cambered surface, and tiny transverse and longitudinal ribs are arranged on the inward cambered surface, the adhesive can be increased between the accessory and the adhered tooth through the inner arc surface, so that the accessory can be fixed on the surface of the tooth in a relatively stable state after the adhesive is solidified, and through the arrangement of the micro transverse and longitudinal ribs on the inner arc surface, the effective contact area between the adhesive and the adhesive surface of the accessory can be increased, so that the adhesive effect of the adhesive on the accessory is improved;
step 3, adhering accessories: and (3) adhering the printed accessory to the enamel surface of the specific tooth according to the scheme designed in the step 1.
Step 4, transferring accessories: carrying out intraoral scanning on the dentition adhered with the accessories to obtain a three-dimensional digital dentition image with accessory forms,
step 5, manufacturing a step-by-step model: fitting the digital dentition model with the accessories with the digital model of the same dentition without the accessories adhered before, transferring the tooth movement scheme to the digital virtual dentition with the accessories to obtain a new step-by-step digital dentition three-dimensional image (STL format), and performing 3D printing;
step 6, manufacturing the appliance: and (3) carrying out hot-press molding on a high polymer material membrane (TPU or PETG) by using the printed step model to prepare the bracket-free invisible appliance with the accessory vacuole, and delivering the bracket-free invisible appliance to a patient to wear after cleaning.
It should be understood by those skilled in the art that the above embodiments are only for illustrating the present invention and are not to be used as a limitation of the present invention, and that changes and modifications to the above embodiments are within the scope of the claims of the present invention as long as they are within the spirit and scope of the present invention.

Claims (5)

1. The method for manufacturing the direct-bonding type transparent appliance accessory through digital 3D printing is characterized by comprising the following steps of:
step 1, designing accessories: carrying out intraoral scanning on a patient, carrying out three-dimensional virtual tooth arrangement, designing a moving step and a tooth moving scheme, and determining a tooth position for placing an accessory and the shape of the accessory according to the tooth moving scheme;
step 2, manufacturing accessories: designing a three-dimensional shape of the accessory by using computer software, and then manufacturing the resin accessory by using 3D printing equipment by using photosensitive resin as a raw material;
step 3, adhering accessories: and (3) adhering the printed accessory to the enamel surface of the specific tooth according to the scheme designed in the step 1.
Step 4, transferring accessories: carrying out intraoral scanning on the dentition adhered with the accessories to obtain a three-dimensional digital dentition image with accessory forms,
step 5, manufacturing a step-by-step model: fitting the digital dentition model with the accessories with the digital model of the same dentition without the accessories adhered before, transferring the tooth movement scheme to the digital virtual dentition with the accessories to obtain a new step-by-step digital dentition three-dimensional image, and performing 3D printing;
step 6, manufacturing the appliance: and (3) carrying out hot-press molding on the high polymer material membrane by using the printed step model to prepare the bracket-free invisible appliance with the accessory vacuole, and delivering the bracket-free invisible appliance to a patient to wear after cleaning.
2. The method for manufacturing the direct-bonded transparent appliance accessory through the digital 3D printing according to claim 1, wherein the step 1 specifically uses digital orthodontic software to design the moving direction and the moving speed of each tooth, extract the whole surface of the crown above the gingival margin of the dentition, design the tolerance of 30-50 microns, and then forward bias the whole body by 2-4 mm.
3. The method for manufacturing the direct-bonding transparent appliance accessory through digital 3D printing according to claim 1, wherein the accessory in the step 2 is in the shape of a cube with different volumes, the corners are rounded, the inner bonding surface is a concave inward arc surface, the inner bonding surface is provided with micro transverse and longitudinal ribs, the center of the outer side surface is provided with a cylindrical protrusion with the height of 3mm and the diameter of 1mm, and the cylindrical protrusion is used for clamping.
4. The method for manufacturing the directly bonded transparent appliance accessory through digital 3D printing according to claim 1, wherein the process of manufacturing the resin accessory in the step 2 is specifically as follows: the method comprises the steps of using a 3D printing device to emit laser with specific wavelength and intensity to focus on the surface of a light-cured material, enabling the laser to be sequentially solidified from point to line and from line to surface to complete drawing operation of one layer, moving the height of one layer of the laser in the vertical direction by a lifting platform or a printing spray head, then solidifying the other layer of the laser, forming a three-dimensional entity in a layer-by-layer mode by overlapping, controlling an ultraviolet laser stone device to be solidified and formed layer by layer through a computer, and fully automatically manufacturing the resin accessory with high surface quality and dimensional accuracy and complex geometric shape.
5. The method for manufacturing the direct-bonded transparent appliance accessory through digital 3D printing according to claim 4, wherein the 3D printing equipment adopts a UVLED mixed light source of 365nm +460nm during printing.
CN202110705029.XA 2021-06-24 2021-06-24 Method for manufacturing direct-bonding type transparent appliance accessory through digital 3D printing Active CN113367814B (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114305750A (en) * 2021-12-31 2022-04-12 北京大学口腔医学院 Invisible orthodontic appliance for dental orthodontics and manufacturing method thereof

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CN105496573A (en) * 2014-09-23 2016-04-20 上海时代天使医疗器械有限公司 Method for providing orthodontic attachment, and orthodontic attachment
CN108309473A (en) * 2017-05-15 2018-07-24 黄跃 One kind is novel to rescue system
CN108720944A (en) * 2018-03-13 2018-11-02 保定翰阳科技有限公司 A kind of optimum design method of stealth dental appliance
CN109228315A (en) * 2018-10-22 2019-01-18 泰州极光电子科技有限公司 A kind of continuous 3D printing system
CN111012528A (en) * 2019-11-22 2020-04-17 中国医科大学附属口腔医院 3D design and manufacturing method of bracket-free invisible appliance
CN111251597A (en) * 2020-01-17 2020-06-09 北京大学口腔医学院 Integrated design and 3D printing method of accurate force control appliance
WO2020223384A1 (en) * 2019-04-30 2020-11-05 uLab Systems, Inc. Attachments for tooth movements

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105496573A (en) * 2014-09-23 2016-04-20 上海时代天使医疗器械有限公司 Method for providing orthodontic attachment, and orthodontic attachment
CN108309473A (en) * 2017-05-15 2018-07-24 黄跃 One kind is novel to rescue system
CN108720944A (en) * 2018-03-13 2018-11-02 保定翰阳科技有限公司 A kind of optimum design method of stealth dental appliance
CN109228315A (en) * 2018-10-22 2019-01-18 泰州极光电子科技有限公司 A kind of continuous 3D printing system
WO2020223384A1 (en) * 2019-04-30 2020-11-05 uLab Systems, Inc. Attachments for tooth movements
CN111012528A (en) * 2019-11-22 2020-04-17 中国医科大学附属口腔医院 3D design and manufacturing method of bracket-free invisible appliance
CN111251597A (en) * 2020-01-17 2020-06-09 北京大学口腔医学院 Integrated design and 3D printing method of accurate force control appliance

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114305750A (en) * 2021-12-31 2022-04-12 北京大学口腔医学院 Invisible orthodontic appliance for dental orthodontics and manufacturing method thereof

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