WO2020250974A1

WO2020250974A1 - Orthodontic aligner and production method therefor

Info

Publication number: WO2020250974A1
Application number: PCT/JP2020/023023
Authority: WO
Inventors: 美咲伊東; 鈴木　憲司
Original assignee: クラレノリタケデンタル株式会社
Priority date: 2019-06-12
Filing date: 2020-06-11
Publication date: 2020-12-17
Also published as: JP2022112526A

Abstract

Provided is an orthodontic aligner that minimizes gaps between said aligner and teeth. This orthodontic aligner is for setting a tooth subject to correction to a target correction position, the aligner being provided with: an occlusion part (21) that covers an occlusal portion (occlusal portion model (11A)) of a dental model (10A) at the target correction position; a cheek-side part (22) that covers a cheek-side surface (cheek-side portion model (12A)) of the dental model (10A); a tongue-side part (23) that covers a tongue-side surface (tongue-side portion model (13A)) of the dental model (10A); and an indentation (25) that is formed in a shape so as to fit a protrusion (protruding portion model (30A)) attached to the dental model (10A).

Description

Orthodontic aligner and its manufacturing method

The present invention relates to an orthodontic aligner and a method for manufacturing the same.

The orthodontic aligner is formed by pressing a plate-shaped resin sheet (see, for example, Patent Document 1).

Patent Document 1 discloses a configuration in which an orthodontic aligner is formed by pressing an uncured resin thin plate with a pressure die punching device or the like to cure it using a tooth mold model. There is.

Japanese Unexamined Patent Publication No. 2017-51261

However, in the configuration described in Patent Document 1, when a protrusion is attached to a tooth for the purpose of adjusting the magnitude and direction of the orthodontic force, a resin is applied to the lower portion of the protrusion given to the tooth mold model during press molding. Does not follow, and a gap is formed between the orthodontic aligner and the tooth mold model.

Therefore, when the orthodontic aligner is attached to the actual tooth to which the protrusion is attached, the above gap naturally occurs between the orthodontic aligner and the protrusion attached to the tooth before and after the orthodontic treatment. It ends up.

In addition, when the protrusions are also moved by the correction of the teeth by the orthodontic aligner, the gap between the orthodontic aligner and the protrusions attached to the orthodontic tooth or the orthodontic tooth becomes large.

At this time, since the orthodontic aligner has reduced adhesion to the protrusions and teeth, it becomes difficult to propagate the force to the protrusions, and there arises a problem that an appropriate orthodontic force cannot be exerted.

In addition, by inputting the physical properties of the resin and the structure of the orthodontic aligner as data and using simulation software based on methods such as CAE (Computer Aided Engineering) analysis, the orthodontic force applied to the teeth and the treatment process are simulated. You may be able to do it. However, in the configuration described in Patent Document 1, the accuracy of the simulation result is lowered because a structural difference occurs between the designed orthodontic aligner and the actually manufactured orthodontic aligner. Is also possible.

Therefore, an object of the present invention is to provide an orthodontic aligner in which the gap between the orthodontic aligner and the teeth or protrusions is suppressed.

In order to achieve the above object, the orthodontic aligner of the present invention is an orthodontic aligner that corrects the tooth to be corrected to the correction target position, and the occlusal portion of the tooth model at the correction target position is formed. An occlusal portion to cover, a buccal side portion covering the buccal side surface of the tooth model, a lingual side portion covering the lingual side surface of the tooth model, and a recess formed in a shape that fits into a protrusion attached to the tooth model. It is characterized by having.

The orthodontic aligner and the manufacturing method thereof of the present invention configured in this way efficiently propagate the force to the protrusions by suppressing the gap between the orthodontic aligner and the protrusions attached to the teeth. And can exert proper corrective power.

FIG. 5 is an exploded perspective view showing an orthodontic aligner and a mandible of Example 1. It is sectional drawing of the incisor which shows the state which the orthodontic aligner of Example 1 is attached to the tooth model of the orthodontic target position in three-dimensional data. It is sectional drawing of the molar tooth which shows the state which the orthodontic aligner of Example 1 is attached to the tooth model of the orthodontic target position in 3D data. It is a flowchart explaining the manufacturing method of the orthodontic aligner of Example 1. It is sectional drawing of the incisor which shows the state which attached the orthodontic aligner of the comparative example to the tooth model of the orthodontic target position. It is sectional drawing of the molar tooth which shows the state which attached the orthodontic aligner of the comparative example to the tooth model of the orthodontic target position. It is sectional drawing of the molar tooth which shows the state which the aligner for orthodontics of Example 2 is attached to the tooth model of the orthodontic target position in 3D data.

Hereinafter, embodiments for realizing an orthodontic aligner and a method for manufacturing the same according to the present invention will be described with reference to Examples 1 and 2 shown in the drawings.

The orthodontic aligner in Example 1 is applied to the orthodontic aligner attached to the crown of the lower jaw.

[Composition of orthodontic aligner]
FIG. 1 is an exploded perspective view showing an orthodontic aligner and a mandible according to the first embodiment. FIG. 2 is a cross-sectional view of an incisor showing a state in which the orthodontic aligner of Example 1 is attached to a tooth model at an orthodontic target position in three-dimensional data. FIG. 3 is a cross-sectional view of a molar tooth showing a state in which the orthodontic aligner of Example 1 is attached to a tooth model at an orthodontic target position in three-dimensional data. Hereinafter, the configuration of the orthodontic aligner of Example 1 will be described. In FIGS. 1 to 3, the tooth 10 shows the one before orthodontics, and the tooth model 10A shows the one at the orthodontic target position.

As shown in FIG. 2, the orthodontic aligner 20 is formed by a laminated modeling device based on three-dimensional data created so as to be in close contact with the tooth model 10A at the orthodontic target position. The orthodontic aligner 20 is attached to the tooth 10 before orthodontics, and corrects the tooth 10 to be corrected to the correction target position.

(Tooth composition)
As shown in FIG. 1, the tooth 10 has a crown composed of an occlusal portion 11, a buccal side surface 12, and a lingual side surface 13. The tooth 10 is supported by the gingiva 15 surrounding the root of the tooth 10.

The occlusal portion 11 is the occlusal end of the upper and lower teeth, and in the incisor, it means the tip thereof, in the canine, it means the tip, and in the molar tooth, it means the tip of the occlusal surface. Say that.

(Composition of tooth model)
As shown in FIGS. 2 and 3, the tooth model 10A includes an occlusal portion model 11A corresponding to the occlusal portion 11, a buccal side model 12A corresponding to the buccal side surface 12, and a lingual side model corresponding to the lingual side surface 13. It is composed of 13A.

As shown in FIG. 1, one protrusion (attachment) 30 is attached to each of the buccal side surface 12 of the incisor and the buccal side surface 12 of the molar tooth in order to adjust the magnitude and direction of the applied force. The protrusion 30 is formed as, for example, a rectangular protrusion made of resin. The protrusion 30 is preferably made of a material that is colorless and transparent, white, or has a color tone equivalent to that of the patient's cervical region.

The shape of the protrusion 30 may be formed, for example, into a rectangular or cross-shaped plate, or may be formed into a shape having a curved surface such as a hemisphere or a cone. For the purpose of suppressing slippage between the protrusion 30 and the orthodontic aligner 20, a convex shape may be formed on the protrusion 30, or burrs may be left on the protrusion 30.

It is more preferable that the protrusion 30 keeps the geometrical tolerance as small as possible. When the protrusion 30 is formed in the shape of a rectangular or cross-shaped plate, for example, the inclination of the plane forming the outer surface of the protrusion 30 is preferably within 0.50 [mm], and 0. It is more preferably within 25 [mm], and even more preferably within 0.10 [mm]. When the protrusion 30 has a curved surface such as a hemisphere or a cone, the contour of an arbitrary line on the curved surface forming the outer surface of the protrusion 30 is within 0.50 [mm]. It is preferably within 0.25 [mm], more preferably within 0.10 [mm], and even more preferably within 0.10 [mm].

It is preferable that at least a part of the protrusion 30 is formed of a flat surface from the viewpoint of suppressing the orthodontic aligner 20 from falling off or slipping and efficiently applying a force. For example, the protrusion 30 can be a pyramid, a prism, a truncated cone, or a truncated cone. The root of the protrusion 30 (the portion connected to the tooth surface) may be R-shaped and smoothly connected to the tooth surface.

The protrusion 30 is preferably a polygonal prism in which all the surfaces connected to the top surface are planes intersecting at right angles. For example, the protrusion 30 can be a triangular prism, a quadrangular prism (rectangular parallelepiped), a regular hexahedron (cube), or a hexagonal prism. It is more preferable that the protrusion 30 is a rectangle such as a rectangular parallelepiped or a cube.

The corners and corners of the protrusion 30 may be R chamfered, C chamfered, or not chamfered. However, from the viewpoint of making it less slippery and having excellent accuracy in transmitting the straightening force, it is preferable that the protrusion 30 is C-chamfered or not chamfered, and it is more preferable that the protrusion 30 is not chamfered. It is preferable that the edges are not chamfered and have sharp edges.

For example, as shown in FIG. 2, the length of the shortest side 31 of the sides of the protrusion model 30A is L1, and the radius of curvature of the corner 32 is R1. That is, the length of the shortest side 31 of the sides of the protrusion 30 is L1, and the radius of curvature of the corner 32 is R1. In this case, R1 / L1 is preferably 0.5 or less, more preferably 0.2 or less, and even more preferably 0.1 or less.

The protrusion 30 may be hollow or may be filled inside. The protrusion 30 may be formed only on a single tooth, or may be formed across a plurality of teeth.

As a method of attaching the protrusion 30, for example, a method of adhering the protrusion 30 that has been molded in advance, or a method of using a template provided with a recess for forming the protrusion 30 and using a curable composition on the tooth surface of the patient. Examples thereof include a method of directly curing on the tooth surface and a method of forming directly on the tooth surface of a patient with a curable composition using an aligner to be treated.

In particular, it is preformed from the viewpoint that it can be accurately placed on the tooth before orthodontics, the designed shape can be accurately reflected, and a force of an appropriate direction and magnitude can be applied (applied). A method of adhering the protruding portion 30 or a method of directly curing the protruding portion 30 on the tooth surface of the patient with a curable composition using a template is preferable. When bonding the preformed protrusions 30, it is preferable to accurately arrange and bond them using an indirect bonding tray provided with recesses for installing the protrusions 30.

Examples of the method of pre-molding the protrusion 30 include laminated molding, cutting, injection molding, and cast molding. Of these, laminated molding or cutting is preferable from the viewpoint of reducing the geometrical tolerance of the recess, and laminated molding or cutting using CAD / CAM technology is more preferable. The above molding method may be used alone or in combination of two or more.

(Composition of orthodontic aligner)
As shown in FIGS. 1 to 3, the orthodontic aligner 20 is formed in a concave groove shape at the occlusal portion 21, the buccal side portion 22, and the lingual side portion 23, and can be attached to and detached from the crown of the lower jaw. It has become. Further, the orthodontic aligner 20 is provided with two recesses 25 on the back surface of the buccal side portion 22.

As shown in FIGS. 2 and 3, the occlusal portion 21 is formed in a shape along the occlusal portion model 11A of the tooth model 10A. That is, the occlusal portion 21 is formed in a shape that covers the occlusal portion model 11A.

The buccal side portion 22 is formed in a shape along the buccal side portion model 12A of the tooth model 10A. That is, the buccal side portion 22 is formed in a shape that covers the buccal side portion model 12A.

The lingual side portion 23 is formed in a shape along the lingual side portion model 13A of the tooth model 10A. That is, the lingual side portion 23 is formed in a shape that covers the lingual side portion model 13A.

The recess 25 is formed in a shape that fits closely with the two protrusion models 30A attached to the tooth model 10A at the correction target position. That is, the recess 25 is formed in a rectangular concave shape corresponding to the protrusion model 30A.

It is more preferable that the recess 25 keeps the geometrical tolerance as small as possible. When the protrusion 30 is formed in the shape of a rectangular or cross-shaped plate, for example, the inclination of the plane forming the inner surface of the recess of the mouthpiece corresponding to the protrusion 30 is within 0.50 [mm]. It is preferably within 0.25 [mm], more preferably within 0.10 [mm], and even more preferably within 0.10 [mm].

When the protrusion 30 is a polygonal prism in which all the surfaces connected to the top surface intersect at right angles, the recess 25 is a plane in which all the surfaces adjacent to the bottom surface intersect at right angles so as to correspond to this. It is preferable to have such a shape. When the protrusion 30 is formed in a rectangular shape, it is desirable that the recess 25 has a shape corresponding to this so that all adjacent planes intersect at right angles.

When the protrusion 30 has a shape formed of a curved surface such as a hemisphere or a cone, the contour degree of an arbitrary line on the curved surface forming the inner surface of the concave portion of the mouthpiece corresponding to the protrusion 30 is 0. It is preferably within .50 [mm], more preferably within 0.25 [mm], and even more preferably within 0.10 [mm].

The corners and corners of the recess 25 may be R chamfered, C chamfered, or not chamfered. However, from the viewpoint of making it less slippery and having excellent accuracy in propagating the straightening force, it is preferable that the corners and corners of the recess 25 are C-chamfered or not chamfered, and are not chamfered. It is more preferable, and it is more preferable that the edges are not chamfered and have sharp edges.

For example, as shown in FIG. 2, the length of the shortest side 26 among the sides of the inner surface of the recess 25 is L2, and the radius of curvature of the corner portion 27 is R2. In this case, R2 / L2 is preferably 0.5 or less, more preferably 0.2 or less, and even more preferably 0.1 or less.

The recess 25 may have a shape that fits into a single protrusion 30, or may have a shape that fits into a plurality of protrusions 30.

The orthodontic aligner 20 is formed with a substantially uniform thickness as shown in FIGS. 2 and 3. The occlusal portion 21 is formed with a thickness T1. The buccal side portion 22 is formed with a thickness T1. The lingual side portion 23 is formed with a thickness T1. The recess 25 is formed with a thickness T1. The thickness T1 is preferably 1.5 [mm] or less, more preferably 1.0 [mm] or less, and further preferably 0.8 [mm] or less. If the thickness exceeds 1.5 [mm], the risk of tooth subsidence increases as a side effect, and the wearing feeling may decrease. The difference in thickness is preferably within 0.50 [mm], more preferably within 0.25 [mm], and even more preferably within 0.10 [mm].

Examples of a method for manufacturing a mouthpiece having a recess corresponding to the protrusion 30 include laminated molding, cutting, injection molding, cast molding and the like. Of these, from the viewpoint of reducing the geometrical tolerance of the concave portion of the mouthpiece, the method for manufacturing the mouthpiece is preferably laminated molding. The above molding method may be used alone or in combination of two or more.

The orthodontic aligner 20 configured in this way is attached to the tooth 10 of the mandible before orthodontics. The tooth 10 to which the orthodontic aligner 20 is attached is corrected to the correction target position. At this time, the force applied by the protrusion 30 to the tooth 10 is finely adjusted.

A plurality of orthodontic aligners 20 are prepared, and the teeth 10 are stepwise corrected to the final orthodontic target position. One orthodontic aligner 20 is formed in a shape that allows the teeth 10 to be moved and corrected by, for example, about 0.25 [mm].

[Manufacturing method of orthodontic aligner]
FIG. 4 is a flowchart illustrating a method for manufacturing the orthodontic aligner 20 according to the first embodiment. Hereinafter, a method for manufacturing the orthodontic aligner 20 of Example 1 will be described.

(Intraoral data acquisition process)
In the intraoral data acquisition step (step S10), a three-dimensional scanner is used to scan the oral cavity of the patient to acquire three-dimensional data in the oral cavity.

(Digital setup process)
In the digital setup step (step S11), the three-dimensional data in the oral cavity acquired in the oral data acquisition step is analyzed by a computer, and the three-dimensional data of the tooth model 10A at the correction target position is created. For example, in the case of stepwise correction to the final correction target position such as in increments of 0.25 [mm], three-dimensional data of the tooth model 10A of a plurality of correction target positions is created. The protrusion model 30A is appropriately attached depending on the direction of correction and the magnitude of the required force. From the viewpoint of reducing the burden on the patient, it is preferable to attach the protrusion model 30A so as not to change the position during a series of treatment plans as much as possible.

At this time, using simulation software based on methods such as CAE (Computer Aided Engineering) analysis and simulation software based on machine learning using big data, step by step while simulating the orthodontic force applied to the teeth and the treatment process. Three-dimensional data of the tooth model 10A at a plurality of correction target positions may be created.

(3D data creation process for orthodontic aligners)
In the three-dimensional data creation step (step S12) of the orthodontic aligner, the orthodontic aligner 20 is based on the three-dimensional data of the tooth model 10A and the protrusion model 30A of the orthodontic target position created in the digital setup step. Create 3D data.

Support may be added to the created three-dimensional data of the orthodontic aligner 20 as needed. The shape, thickness, density, angle, etc. of the support are appropriately adjusted according to the size, angle, and overhang portion of the three-dimensional data.

(Laminate molding process)
In the laminated modeling step (step S13), the orthodontic aligner 20 is formed by the laminated modeling device based on the three-dimensional data of the orthodontic aligner 20 created in the three-dimensional data creation step of the orthodontic aligner 20. To manufacture.

(Post-treatment process)
In the post-treatment step (step S14), some or all unreacted substances, for example, unpolymerized monomers, are removed from the produced orthodontic aligner 20. In the post-treatment step, removal of unreacted substances using gravity or centrifugal force, removal of unreacted substances by cleaning with organic solvent or air blow, drying, irradiation device using fluorescent lamp, halogen lamp, LED light source, etc. It may include a step of performing photopolymerization or thermal polymerization according to the above. Through the above steps, the orthodontic aligner 20 is manufactured.

The maximum gap between the orthodontic aligner 20 manufactured in this way and the three-dimensional data of the tooth model 10A can be 0.25 mm or less.

[Action of orthodontic aligner and its manufacturing method]
FIG. 5 is a cross-sectional view of an incisor showing a state in which an orthodontic aligner of a comparative example is attached to a tooth model at an orthodontic target position. FIG. 6 is a cross-sectional view of a molar tooth showing a state in which an orthodontic aligner of a comparative example is attached to a tooth model at an orthodontic target position. Hereinafter, the operation of the orthodontic aligner 20 of Example 1 and the method for manufacturing the same will be described with reference to FIGS. 5 and 6.

By the way, as shown in FIG. 5, the orthodontic aligner 520 of the comparative example is formed by pressing a thermoplastic resin sheet from above against the tooth model 510A in which the teeth are moved to the orthodontic target position. In the orthodontic aligner 520 of the comparative example formed in this way, a gap G between the tooth model 510A and the orthodontic aligner 520 is formed directly under the protrusion model 530A.

Further, the template provided with the recess for forming the protrusion 30 is produced by press molding. Therefore, in such a template, the resin does not follow the lower portion of the protrusion 30 and the sharp edge portion provided on the tooth model.

Therefore, the protrusion 30 formed by the template produced by such a method cannot reproduce the shape as designed in the lower portion of the protrusion 30 and the sharp edge portion, and the angular portion is reduced. Therefore, it may become slippery.

At this time, since the adhesion to the protrusions 30 and the teeth is lowered, it becomes difficult to propagate the force to the protrusions 30, and there is a problem that an appropriate orthodontic force cannot be exerted.

On the other hand, the orthodontic aligner 20 of the first embodiment is an orthodontic aligner 20 that corrects the tooth to be corrected to the correction target position, and is an occlusal portion (occlusal part model) of the tooth model 10A at the correction target position. An occlusal portion 21 covering 11A), a buccal portion 22 covering the buccal side surface (buccal side model 12A) of the tooth model 10A, and a lingual side portion 23 covering the lingual side surface (lingual side model 13A) of the tooth model 10A. A recess 25 formed in a shape that fits into a protrusion (protrusion model 30A) attached to the tooth model 10A (FIG. 2).

As a result, the recess 25 can be brought into close contact with the protrusion (protrusion model 30A) at the correction target position. Therefore, the gap between the orthodontic aligner 20 and the tooth model 10A at the orthodontic target position can be suppressed. As a result, the adhesion to the tooth 10 to be corrected can be improved, and the tooth 10 can be moved to the correction target position by applying an appropriate force. Therefore, the tooth 10 to be corrected can be corrected to a target position, for example, a position of a simulation result.

Further, the orthodontic aligner 20 of Example 1 can accurately reflect the design of the operator. Therefore, the accuracy of the simulation before treatment can be improved.

By the way, as shown in FIG. 6, the orthodontic aligner 520 of the comparative example is molded by pressing a thermoplastic resin sheet from above against the tooth model 510A in which the teeth are moved to the orthodontic target position. Therefore, in the orthodontic aligner 520 of the comparative example, the buccal side portion 522 and the lingual side portion 523 are thinly stretched. Then, the thickness T2 of the buccal side portion 522 and the lingual side portion 523 becomes thinner than the thickness T3 of the occlusal portion 521. As a result, the tooth 10 may be pushed into the lower or upper gingiva, or the lateral (horizontal) orthodontic force of the tooth 10 may decrease. Therefore, the orthodontic aligner of the comparative example cannot correct the tooth 10 to the target position.

On the other hand, in the orthodontic aligner 20 of Example 1, the thickness T1 of the occlusal portion 21, the buccal side portion 22, and the lingual side portion 23 is substantially uniform (FIG. 2).

As a result, it is possible to suppress pushing the tooth 10 into the lower or upper gingiva and improve the lateral (horizontal) orthodontic force of the tooth 10. Therefore, the tooth 10 can be corrected to the target position.

In the method for manufacturing the orthodontic aligner 20 of Example 1, the orthodontic aligner 20 includes a laminated modeling step manufactured by a laminated modeling device (FIG. 4).

For example, when the lamination pitch of the lamination molding apparatus is 0.10 [mm], the gap between the orthodontic aligner 20 and the tooth model 10A at the orthodontic target position can be within 0.10 [mm]. .. Therefore, the tooth 10 to be corrected can be moved to the correction target position by applying an appropriate force. As a result, the tooth 10 to be corrected can be corrected to a target position.

The stacking pitch is preferably 0.25 [mm] or less, more preferably 0.15 [mm] or less, and even more preferably 0.10 [mm] or less. The stacking pitch is preferably 0.01 [mm] or more, more preferably 0.02 [mm] or more, and even more preferably 0.05 [mm] or more. When the stacking pitch exceeds 0.25 [mm], the stacking marks on the surface of the orthodontic aligner may be conspicuous, and the aesthetics and cleanability may be deteriorated. If the stacking pitch is less than 0.01 [mm], the curing progresses to the periphery of the designed area due to excessive laser light irradiation, the molding accuracy decreases, and the orthodontic aligner becomes thicker than the design. It ends up. In addition, as the number of stacking increases, the number of times energy is received increases, so that the tray used for modeling is easily damaged. In particular, when silicone is used for the tray, it is remarkably deteriorated by one molding, so that it is impossible to mold more than once in the same place. As a result, it takes time and loss to transfer the ink (for example, a photocurable resin), and the productivity is lowered.

The orthodontic aligner of Example 2 is different from the orthodontic aligner of Example 1 in that the occlusal portion, the buccal side portion, and the lingual side portion are different in configuration.

[Composition of orthodontic aligner]
FIG. 7 is a cross-sectional view of a molar tooth showing a state in which the orthodontic aligner of Example 2 is attached to a tooth model at an orthodontic target position in three-dimensional data. Hereinafter, the configuration of the orthodontic aligner of Example 2 will be described with reference to FIG. 7. The same or equivalent parts as those described in the above examples will be described using the same terms or the same reference numerals.

As shown in FIG. 7, the orthodontic aligner 120 of the second embodiment is formed in a concave groove shape by the occlusal portion 121, the buccal side portion 122, and the lingual side portion 123, and is attached to and detached from the lower jaw tooth model 10A. It is possible.

The occlusal portion 121 is formed with a thickness of T4. The buccal side portion 122 is formed with a thickness T5 thicker than the thickness T4. The lingual side portion 123 is formed with a thickness T8 thinner than the thickness T4. The lingual side portion 123 can be made thicker than the thickness T4.

Of the buccal side portion 122, the horizontal thickness T6 of the side portion 122b forming the recess 25 is formed to be thicker than the thickness T4. The surface of the buccal side portion 122 corresponding to the recess 25 is formed in a smooth shape without steps.

Of the buccal side portions 122, the minimum thickness T7 of the lower portion 122a forming the recess 25 is set to be equal to or greater than the horizontal thickness T6 of the side portion 122b forming the recess 25. In other words, the relationship between the minimum thickness T7 of the lower portion 122a forming the concave portion 25 and the horizontal thickness T6 of the side portion 122b forming the concave portion 25 satisfies the following relational expression.
T7 / T6 ≧ 1

[Action of orthodontic aligner]
The operation of the orthodontic aligner 120 of Example 2 will be described. In the orthodontic aligner 120 of Example 2, the thickness T5 of at least one of the buccal side portion 122 and the lingual side portion 123 is thicker than the thickness T4 of the occlusal portion 121 (FIG. 7).

Since the thickness T4 of the occlusal portion 521 can be reduced, it is possible to prevent the tooth 10 from being unintentionally pushed into the lower or upper gingiva. Further, since the thickness T5 of at least one of the buccal side portion 122 and the lingual side portion 123 can be increased, the lateral (horizontal) corrective force of the tooth 10 can be improved.

In the orthodontic aligner 120 of Example 2, the surface corresponding to the recess 25 is smoothly formed (FIG. 7).

As a result, when the orthodontic aligner 120 is placed in the oral cavity, the feeling of foreign matter disappears. As a result, the wearing feeling of the orthodontic aligner 120 can be improved.

In the orthodontic aligner 120 of Example 2, the minimum thickness T7 of the lower portion 122a forming the concave portion 25 is equal to or larger than the horizontal thickness T6 of the side portion 122b forming the concave portion 25 (FIG. 7).

As a result, the lower surface of the recess 25 can be brought into close contact with the protrusion 30, and the straightening force can be improved.

The other configurations and actions and effects are substantially the same as those in the above embodiment, and thus description thereof will be omitted.

The orthodontic aligner of the present invention and its manufacturing method have been described above based on Examples 1 and 2. However, the specific configuration is not limited to these examples, and as long as the gist of the invention according to each claim of the claims is not deviated, design changes, combinations of each embodiment, and additions are made. Etc. are acceptable.

In Example 1 and Example 2, two protrusions 30 are attached to the buccal side surface 12. However, the place and number of protrusions to be attached are not limited to this embodiment. For example, the protrusion may be attached to the buccal side 22 or the lingual side 23.

In Example 1 and Example 2, the protrusion 30 is formed in a rectangular shape. However, the protrusion is not limited to a rectangle, and may be formed in a hemispherical shape, a conical shape, or a cross shape, for example.

In Examples 1 and 2, an example was shown in which the laminated modeling apparatus was a stereolithography method using a photocurable resin that was cured by ultraviolet rays. However, the additive manufacturing device may be a projection method in which the photocurable resin is cured by using the light of a projector and laminated, or a liquid ultraviolet curable resin is jetted and cured by illuminating the ultraviolet rays. It may be an inkjet method in which heat-soluble resins are laminated one by one, or a heat-melting lamination method in which heat-soluble resins are stacked one by one, or powder baking in which a powdery material is sintered by applying a high-power laser beam. It may be a connection method.

In Examples 1 and 2, the

orthodontic aligners

20 and 120 are formed in a concave groove shape covering the crown (occlusal portion 11, buccal side surface 12, and lingual side surface 13). However, the orthodontic aligner may have a shape that covers the crown and the gingiva, or the crown and the floor portion.

In Example 1 and Example 2, an example in which the present invention is applied to the

orthodontic aligners

20 and 120 to be attached to the crown of the lower jaw is shown. However, the present invention can be applied to an orthodontic aligner to be attached to the crown of the maxilla.

Cross-reference of related applications

This application claims priority based on Japanese Patent Application No. 2019-109885 filed with the Japan Patent Office on June 12, 2019, the entire disclosure of which is incorporated herein by reference in its entirety.

Claims

An orthodontic aligner that corrects the tooth to be corrected to the correction target position.
An occlusal portion that covers the occlusal portion of the tooth model at the correction target position,
The buccal side covering the buccal side of the tooth model and
The lingual side covering the lingual side of the tooth model and
An orthodontic aligner comprising a recess formed in a shape that fits into a protrusion attached to the tooth model.
The orthodontic aligner according to claim 1, wherein the thickness of the occlusal portion, the buccal side portion, and the lingual side portion is substantially uniform.
The orthodontic aligner according to claim 1, wherein the thickness of at least one of the buccal portion and the lingual portion is thicker than the thickness of the occlusal portion.
The orthodontic aligner according to claim 3, wherein the surface corresponding to the recess is smoothly formed.
The inner surface of the recess is made of a flat surface.
The orthodontic aligner according to any one of claims 1 to 4, wherein the inclination of the plane is within 0.50 mm.
An orthodontic aligner that fits into the protrusion so that the outer surface is composed of a flat surface and the inclination of the flat surface of the outer surface is within 0.50 mm.
The orthodontic aligner according to any one of claims 1 to 5, wherein the maximum gap between the tooth model data and the orthodontic aligner is 0.25 mm or less.
The inner surface of the recess is made of a flat surface.
The orthodontic aligner according to any one of claims 1 to 6, wherein the recess is formed in a shape in which all planes adjacent to the bottom surface intersect at right angles.
The inner surface of the recess is made of a flat surface.
The orthodontic aligner according to any one of claims 1 to 7, wherein the recess is formed in a shape in which all adjacent planes intersect at right angles.
The inner surface of the recess is made of a flat surface.
Claims 1 to 8 are characterized in that R / L is 0.5 or less when the length of the shortest side of the inner surface is L and the radius of curvature of the corner portion of the inner surface is R. The orthodontic aligner according to any one of the above.
The inner surface of the recess is composed of a curved surface.
The orthodontic aligner according to any one of claims 1 to 4, wherein the contour degree of an arbitrary line on the curved surface is within 0.50 mm.
An orthodontic aligner that fits into the protrusion so that the outer surface is composed of a curved surface and the contour degree of an arbitrary line on the curved surface of the outer surface is within 0.50 mm.
The maximum gap between the tooth model data and the orthodontic aligner is within 0.25 mm.
The orthodontic aligner according to any one of claims 1 to 4 and 10, characterized in that.
The orthodontic aligner according to any one of claims 1 to 11, wherein the minimum thickness of the lower portion forming the concave portion is equal to or larger than the horizontal thickness of the side portion forming the concave portion. ..
The maximum gap between the tooth model data and the orthodontic aligner is within 0.25 mm.
The orthodontic aligner according to any one of claims 1 to 12, characterized in that.
The method for manufacturing an orthodontic aligner according to any one of claims 1 to 13.
The method for manufacturing an orthodontic aligner, wherein the orthodontic aligner includes a laminated molding step manufactured by a laminated molding apparatus.