JP2022112526A - Orthodontic aligner and manufacturing method of the same - Google Patents

Abstract

To provide an orthodontic aligner which suppresses a clearance between the orthodontic aligner and a tooth.SOLUTION: The orthodontic aligner for correcting a tooth to be corrected, to a correction target position comprises: an occlusion part 21 which covers an occlusion portion (occlusion portion model 11A) of a tooth model 10A at a correction target position; a buccal part 22 which covers a buccal face (buccal part model 12A) of the tooth model 10A; a tongue side part 23 which covers a tongue side face (tongue side part model 13A) of the tooth model 10A; and a recess 25 formed in a shape fitting to a protrusion (protrusion model 30A) attached to the tooth mode 10A.SELECTED DRAWING: Figure 2

Description

The present invention relates to an orthodontic aligner and a manufacturing method thereof.

Conventionally, orthodontic aligners are formed by pressing plate-shaped resin sheets (see, for example, Patent Document 1).

Patent Literature 1 discloses a configuration in which an aligner for orthodontics is formed by pressing a thin sheet of uncured resin using a model of a tooth mold with a pressurized die-cutting device or the like to cure it. there is

JP 2017-51261

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

Therefore, when the protrusions are attached to the actual teeth, if a preformed one is used, the above-mentioned gap naturally exists between the orthodontic aligner and the protrusions attached to the teeth before and after correction. occur.

Further, when a template having recesses is used to form protrusions with a curable composition or the like, no gaps are formed between the orthodontic aligner and the protrusions attached to the teeth before correction. . However, since the projections also move when the teeth are corrected by the orthodontic aligner, a gap is generated between the orthodontic aligner and the corrected teeth or the projections attached to the corrected teeth. end up

At this time, the orthodontic aligner loses adhesion to the protrusions and teeth, so that it becomes difficult to transmit force to the protrusions, resulting in 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 can be simulated. may be possible. However, with the configuration described in Patent Document 1, there is a structural difference between the designed orthodontic aligner and the actually manufactured orthodontic aligner, which reduces the accuracy of the simulation results. is also conceivable.

Accordingly, it is an object of the present invention to provide an orthodontic aligner in which the gaps between the orthodontic aligner and the teeth or protrusions are suppressed.

In order to achieve the above object, an orthodontic aligner of the present invention is an orthodontic aligner for correcting teeth to be corrected to correction target positions, wherein the occlusal portions of tooth models at the correction target positions are: a covering occlusal portion, 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 concave portion formed in a shape to fit the protrusion attached to the tooth model; characterized by comprising

The orthodontic aligner and the method for manufacturing the same according to the present invention configured as described above effectively transmit force to the projections by suppressing the gap between the orthodontic aligner and the projections attached to the teeth. It is possible to exert an appropriate correction force.

1 is an exploded perspective view showing an orthodontic aligner and a lower jaw of Example 1. FIG. 1 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 a correction target position in three-dimensional data. FIG. 1 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 a correction target position in three-dimensional data. FIG. 1 is a flow chart illustrating a method for manufacturing an orthodontic aligner of Example 1. FIG. FIG. 2 is a cross-sectional view of an incisor showing a state in which an orthodontic aligner of a comparative example is attached to a dental model at a correction target position. Fig. 2 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 dental model at a correction target position. FIG. 4 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 a correction target position in three-dimensional data.

An embodiment for realizing an orthodontic aligner and a method for manufacturing the same according to the present invention will be described below based on Example 1 and Example 2 shown in the drawings.

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

[Configuration of orthodontic aligner]
FIG. 1 is an exploded perspective view showing the orthodontic aligner and lower jaw of Example 1. FIG. 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 a correction 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 a correction target position in three-dimensional data. The configuration of the orthodontic aligner of Example 1 will be described below with reference to FIGS. 1 to 3. FIG. 1 to 3, teeth 10 are shown before correction, and tooth models 10A are shown at correction target positions.

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

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

The occlusal portion 11 is the end of the occlusal side of the upper and lower teeth, and refers to the tip of the incisor, the tip of the canine, and the occlusal surface of the molar. Say things.

As shown in FIGS. 2 and 3, the tooth model 10A includes an occlusal part model 11A corresponding to the occlusal part 11, a buccal side model 12A corresponding to the buccal side 12, and a lingual side part model corresponding to the lingual side 13. 13A.

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

The shape of the projection may be, for example, a rectangular or cross-shaped plate, or a shape having a curved surface such as a hemispherical or conical shape. For the purpose of suppressing slippage between the projections and the orthodontic aligner 20, the projections may be formed with a convex shape, or burrs may be left on the projections.

More preferably, the protrusions adhere to the smallest possible geometrical tolerances. For example, when the protrusion is formed in a rectangular or cross-shaped plate shape, the degree of inclination of the plane constituting the outer surface of the protrusion is preferably within 0.50 [mm], and preferably within 0.25 [mm]. mm], and more preferably within 0.10 [mm]. If the protrusion has a curved surface such as a hemispherical shape or a conical shape, the profile of any line on the curved surface that constitutes the outer surface of the protrusion should be within 0.50 [mm]. , more preferably within 0.25 [mm], even more preferably within 0.10 [mm].

The corners and corners of the protrusion may be R-chamfered, C-chamfered, or may not be chamfered. However, from the viewpoint of preventing slippage and improving the accuracy of propagating the correction force, the protrusions are preferably chamfered or not chamfered, more preferably not chamfered. , preferably not chamfered to form a sharp edge. The protrusion may be hollow or filled. The protrusion may be formed only on a single tooth, or may be formed across a plurality of teeth.

As a method for attaching the projections, for example, a method of bonding pre-molded projections, or a method of directly applying a curable composition on the patient's tooth surface using a template having recesses for forming the projections. Examples include a method of curing, and a method of forming directly on the patient's tooth surface from a curable composition using an aligner to be treated.

In particular, from the viewpoint that it can be accurately placed on the teeth before orthodontic treatment, accurately reflect the designed shape, and can apply (apply) a force in an appropriate direction and magnitude, pre-molded teeth It is preferable to use a method in which the protrusions are adhered together, or a method in which the curable composition is directly cured on the patient's tooth surface using a template. When bonding a projection that has been molded in advance, it is preferable to use an indirect bonding tray that has a recess for installing the projection, and to precisely arrange and bond the tray.

Mouthpieces with recesses corresponding to protrusions, such as indirect bonding trays or templates, more preferably adhere to the smallest possible geometrical tolerances. When the protrusion is formed in a rectangular or cross-shaped plate shape, for example, the degree of inclination of the plane constituting the inner surface of the recess of the mouthpiece corresponding to the protrusion should be within 0.50 [mm]. , more preferably within 0.25 [mm], even more preferably within 0.10 [mm].

If the projection has a curved surface such as a hemispherical shape or a conical shape, the profile of an arbitrary line on the curved surface that constitutes the inner surface of the recess of the mouthpiece corresponding to the projection is 0.50. It is preferably within [mm], more preferably within 0.25 [mm], and even more preferably within 0.10 [mm].

The corners and corners of the recess of the mouthpiece may be R-chamfered, C-chamfered, or not chamfered. However, from the viewpoint of making it difficult to slip and improving the accuracy of propagating corrective force, it is preferable that the corners and corners of the concave portion of the mouthpiece are chamfered or not chamfered. It is more preferable that it is not chamfered, and it is even more preferable that it is not chamfered and forms a sharp edge.

Examples of the method of forming the protrusion in advance include lamination molding, cutting, injection molding, and cast molding. Among these, from the viewpoint of reducing the geometrical tolerance of the concave portion, layered manufacturing or cutting is preferable, and layered manufacturing or cutting using CAD/CAM technology is more preferable. The molding methods described above may be used singly or in combination.

Methods of manufacturing a mouthpiece, such as an indirect bonding tray or template, with recesses corresponding to protrusions include, for example, additive manufacturing, machining, injection molding, cast molding, and the like. Among these methods, lamination molding is preferable as the method for manufacturing the mouthpiece from the viewpoint of reducing the geometrical tolerance of the concave portion of the mouthpiece. The molding methods described above may be used singly or in combination.

The orthodontic aligner 20 is formed by irradiating a photo-curing resin with ultraviolet light, for example, by a stereolithography type lamination molding apparatus. As shown in FIGS. 1 to 3, the orthodontic aligner 20 is formed in a groove shape by an occlusal portion 21, a buccal side portion 22, and a lingual side portion 23, and is detachably attachable to the crown of the lower jaw. It's becoming The orthodontic aligner 20 also has two recesses 25 on the rear surface of the buccal portion 22 .

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

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

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

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

More preferably, the recesses 25 adhere to the smallest possible geometrical tolerances. For example, when the protrusion is in the shape of a rectangular or cross-shaped plate, the degree of inclination of the plane forming the recess 25 is preferably within 0.50 [mm], and preferably within 0.25 [mm]. More preferably, it is within 0.10 [mm]. In the case where the projection has a curved surface such as a hemispherical shape or a conical shape, the profile of any line on the curved surface that constitutes the concave portion 25 should be within 0.50 [mm]. It is preferably within 0.25 [mm], more preferably within 0.10 [mm].

The corners and corners of the concave portion 25 may be R-chamfered, C-chamfered, or may not be chamfered. However, from the viewpoint of making it difficult to slip and improving the accuracy of propagating the correction force, the corners and corners of the concave portion 25 are preferably chamfered or not chamfered, and are not chamfered. More preferably, it is not chamfered and forms a sharp edge. The recess 25 may have a shape that fits a single protrusion, or a shape that fits a plurality of protrusions.

The orthodontic aligner 20 is formed with a substantially uniform thickness, as shown in FIGS. The bite portion 21 is formed with a thickness T1. The buccal portion 22 is formed with a thickness T1. The lingual 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 even more preferably 0.8 [mm] or less. If the thickness exceeds 1.5 [mm], the risk of tooth settling increases as a side effect, and the feeling of wearing may deteriorate. The thickness difference is preferably within 0.50 [mm], more preferably within 0.25 [mm], and even more preferably within 0.10 [mm].

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

A plurality of orthodontic aligners 20 are prepared to correct the teeth 10 to the final correction target positions in stages. One orthodontic aligner 20 is formed in a shape that can move and correct the teeth 10 by 0.25 [mm], for example.

[Method for producing orthodontic aligner]
FIG. 4 is a flow chart for explaining the method of manufacturing the orthodontic aligner 20 of Example 1. As shown in FIG. A method of manufacturing the orthodontic aligner 20 of Example 1 will be described below with reference to FIG.

(Oral data acquisition step)
In the intraoral data acquisition step (step S10), a three-dimensional scanner is used to scan the patient's oral cavity to acquire intraoral three-dimensional data.

(Digital setup process)
In the digital setup step (step S11), the intraoral three-dimensional data acquired in the intraoral data acquisition step is analyzed by a computer to create three-dimensional data of the tooth model 10A at the correction target position. For example, in the case of stepwise correction to the final correction target position in steps of 0.25 [mm], three-dimensional data of the tooth model 10A at 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 that the position of the projection model 30A is not changed 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 corrective target positions may be created.

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

The created three-dimensional data of the orthodontic aligner 20 may be given support if necessary. 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 manufacturing process)
In the layered manufacturing process (step S13), based on the three-dimensional data of the orthodontic aligner 20 created in the three-dimensional data creation process of the orthodontic aligner 20, the orthodontic aligner 20 is manufactured by the layered manufacturing apparatus. manufacture.

(Post-treatment process)
In the post-treatment step (step S14), part or all of the unreacted substances, such as unpolymerized monomers, are removed from the manufactured orthodontic aligner 20 . In the post-treatment process, removal of unreacted substances using gravity and centrifugal force, removal of unreacted substances by washing with organic solvents and air blow, drying, irradiation using fluorescent lamps, halogen lamps, LED light sources, etc. A step of performing photopolymerization or thermal polymerization may be included. 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 within 0.25 mm.

[Effect of orthodontic aligner and manufacturing method thereof]
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 dental model at a correction 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 dental model at a correction target position. Hereinafter, the operation of the orthodontic aligner 20 of Example 1 and the method of manufacturing the same will be described with reference to FIGS.

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 dental model 510A whose teeth have been moved to the corrective target positions. In the orthodontic aligner 520 of the comparative example molded in this manner, a gap G is formed between the tooth model 510A and the orthodontic aligner 520 directly below the projection model 530A.

A template having recesses for forming protrusions is produced by press molding. Therefore, in such a template, the resin does not follow the lower part of the projections provided on the tooth model and the sharp edges.

Therefore, the projections formed by the template manufactured by such a method cannot reproduce the shape as designed in the lower part of the projection and the sharp edge part, and the angular parts are reduced. It may become slippery.

At this time, since the adhesiveness to the protrusions and teeth is lowered, it becomes difficult to transmit the force to the protrusions, and there is a problem that an appropriate corrective force cannot be exerted.

On the other hand, the orthodontic aligner 20 of Example 1 is an orthodontic aligner 20 that corrects teeth to be corrected to correction target positions, and is an occlusion portion (occlusion portion model) of the tooth model 10A at the correction target position. 11A), the buccal side 22 covering the buccal side of the tooth model 10A (the buccal side model 12A), and the lingual side 23 covering the lingual side of the tooth model 10A (lingual side part model 13A). , and a concave portion 25 formed in a shape that fits the projection (projection model 30A) attached to the tooth model 10A (FIG. 2).

As a result, the concave portion 25 can be brought into close contact with the projection (projection model 30A) at the correction target position. Therefore, the gap between the orthodontic aligner 20 and the tooth model 10A at the correction target position can be suppressed. As a result, it is possible to improve the adhesion to the tooth 10 to be corrected, and to move it 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 simulation result position.

Further, the orthodontic aligner 20 of Example 1 can accurately reflect the operator's design. Therefore, it is possible to improve the accuracy of the simulation before treatment.

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 dental model 510A whose teeth have been moved to the corrective target positions. Therefore, in the orthodontic aligner 520 of the comparative example, as shown in FIG. 6, the buccal portion 522 and the lingual portion 523 are stretched thin. The thickness T2 of the buccal portion 522 and the tongue portion 523 becomes thinner than the thickness T3 of the occlusal portion 521 . As a result, the tooth 10 may be pushed downward or upward into the gingiva, or the lateral (horizontal) corrective force of the tooth 10 may be reduced. 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 portion 22, and the lingual portion 23 is substantially uniform (Fig. 2).

As a result, pushing the teeth 10 downward or upward into the gingiva can be suppressed, and the lateral (horizontal) correction force of the teeth 10 can be improved. Therefore, the tooth 10 can be corrected to the target position.

In the manufacturing method of the orthodontic aligner 20 of Example 1, the orthodontic aligner 20 includes a layered manufacturing process manufactured by a layered manufacturing apparatus (Fig. 4).

For example, when the lamination pitch of the layered manufacturing apparatus is 0.10 [mm], the gap between the orthodontic aligner 20 and the tooth model 10A at the correction 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 the target position.

The lamination pitch is preferably 0.25 [mm] or less, more preferably 0.15 [mm] or less, and even more preferably 0.10 [mm] or less. Moreover, the lamination pitch is preferably 0.01 [mm] or more, more preferably 0.02 [mm] or more, and still more preferably 0.05 [mm] or more. When the lamination pitch exceeds 0.25 [mm], lamination traces on the surface of the orthodontic aligner are conspicuous, and aesthetics and cleanability may deteriorate. When the lamination pitch is less than 0.01 [mm], the molding accuracy is lowered, and the aligner for orthodontics becomes thicker than designed. In addition, as the number of layers increases, the number of times that the tray receives energy increases, so the tray used for modeling is more likely to be damaged. In particular, if silicone is used for the tray, it will be significantly deteriorated after one molding, making it impossible to mold twice or more at the same place. As a result, it takes time and effort to transfer the ink (for example, a photocurable resin), and loss occurs, resulting in a decrease in productivity.

The orthodontic aligner of Example 2 differs from the orthodontic aligner of Example 1 in that the occlusal portion, the buccal portion, and the lingual portion are configured differently.

[Configuration 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 a correction target position in three-dimensional data. The configuration of the orthodontic aligner of Example 2 will be described below with reference to FIG. It should be noted that the same terminology or the same reference numerals will be used to describe the same or equivalent portions as those described in the above embodiment.

As shown in FIG. 7, the orthodontic aligner 120 of Example 2 is formed in a concave groove shape by an occlusal portion 121, a buccal side portion 122, and a lingual side portion 123, and is detachable from the lower jaw tooth model 10A. It is possible.

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

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

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

[Action of orthodontic aligners]
The action 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 portion 122 and the lingual 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 made thin, it is possible to prevent the tooth 10 from being unintentionally pushed into the lower or upper gingiva. Moreover, since the thickness T5 of at least one of the buccal portion 122 and the lingual portion 123 can be increased, the lateral (horizontal) correction force of the teeth 10 can be improved.

In the orthodontic aligner 120 of Example 2, the surfaces corresponding to the recesses 25 are formed smooth (Fig. 7).

As a result, when the orthodontic aligner 120 is worn in the oral cavity, the feeling of a foreign body is eliminated. As a result, the feeling of wearing 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 recess 25 is equal to or greater than the horizontal thickness T6 of the side portion 122b forming the recess 25 (Fig. 7).

As a result, the lower surface of the concave portion 25 can be brought into close contact with the projection portion 30 to improve the correction force.

Other configurations and functions and effects are substantially the same as those of the above embodiment, so description thereof will be omitted.

The orthodontic aligner and the manufacturing method thereof according to the present invention have been described above based on Examples 1 and 2. However, the specific configuration is not limited to these examples, and changes in design, combinations of examples, and Additions are allowed.

In Example 1 and Example 2, two protrusions 30 were attached to the buccal surface 12 . However, the location and the number of protrusions to be attached are not limited to this aspect. For example, protrusions may be attached to buccal portion 22 and lingual portion 23 .

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

In Example 1 and Example 2, an example was shown in which the layered modeling apparatus is a stereolithographic method using a photocurable resin that is cured by ultraviolet rays. However, as a layered manufacturing apparatus, a projection method may be used in which light from a projector is used to cure a photo-curing resin to form layers, or liquid UV-curing resin is injected and cured by irradiating with ultraviolet rays. It may be an ink-jet method in which the resin is layered and layered, a thermal melting layering method in which heat-melting resin is stacked one by one, or a powder sintering method in which a high-output laser beam is applied to a powdered material to sinter it. A connection method may be used.

Examples 1 and 2 show examples in which the orthodontic aligners 20 and 120 are formed into grooves covering the crowns (the occlusal portion 11, the buccal surface 12 and the lingual surface 13). However, orthodontic aligners may be shaped to cover the crown and gingiva, or the crown and base.

Examples 1 and 2 show examples in which the present invention is applied to the orthodontic aligners 20 and 120 that are attached to the crowns of the lower jaw. However, the present invention is applicable to orthodontic aligners that are worn on the crowns of the maxillary teeth.

REFERENCE SIGNS LIST 10 teeth 10A tooth model 20 orthodontic aligner 21 occlusal part 22 buccal part 23 lingual part 25 recess 30 protrusion

Claims (11)

An orthodontic aligner for correcting a tooth to be corrected to a correction target position,
an occlusal portion that covers the occlusal portion of the tooth model at the correction target position;
a buccal part that covers the buccal side of the tooth model;
a lingual portion that covers the lingual surface of the tooth model;
and recesses shaped to fit projections attached to the tooth model. The orthodontic aligner according to claim 1, wherein thicknesses of the occlusal portion, the buccal portion, and the lingual portion are 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 greater than the thickness of the occlusal portion. 4. The orthodontic aligner according to claim 3, wherein the surfaces corresponding to the recesses are smooth. The inner surface of the recess is flat,
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 having an outer surface composed of a flat surface, wherein the flat surface has an inclination of 0.50 mm or less, and is fitted to the protrusion,
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 5, characterized by: The inner surface of the recess is configured with a curved surface,
The orthodontic aligner according to any one of Claims 1 to 4, wherein the profile of any line on the curved surface is within 0.50 mm. An orthodontic aligner that has an outer surface configured with a curved surface, and that is fitted to the protrusion such that the contour of any line on the curved 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 7, characterized by: The orthodontic aligner according to any one of claims 1 to 8, wherein the minimum thickness of the lower portion forming the recess is equal to or greater than the horizontal thickness of the side portion forming the recess. . 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 9, characterized in that: A method for manufacturing the orthodontic aligner according to any one of claims 1 to 10,
A method for manufacturing an orthodontic aligner, wherein the aligner for orthodontics is manufactured by a layered manufacturing apparatus.

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