JP2023131444A - Orthodontic tool - Google Patents

Abstract

To provide an orthodontic tool capable of correcting respective teeth of a dentition part and improving tongue habit.SOLUTION: There is provided an orthodontic tool correcting respective teeth of an upper jaw dentition part 2 in a state of being attached so as to cover the upper jaw detention part 2. The orthodontic tool comprises: a main body part 10a for fitting to a crown part of the upper jaw detention part 2 for correcting the respective teeth; and a palate side extension part 11b which is formed to extend to a tooth root part side from the main body part 10a. On the palate side extension part 11b, there is provided a part whose shape is different from other parts on a part corresponding to a front interdental part of the upper jaw dentition part 2. The part is a protrusion part 12 which serves as a shape change part to which a user can focus one's attention to the part, by contacting of a user's tongue tip to the part.SELECTED DRAWING: Figure 2

Description

The present invention relates to an orthodontic appliance for correcting individual teeth in a dentition.

Conventionally, appliances for correcting dentition include, for example, mouthpieces that are attached to dentition. Such a mouthpiece is formed in a shape that covers the entire upper tooth row or the entire lower tooth row, and there is, for example, a dental instrument described in Patent Document 1. The dental appliance includes a shell having a cavity configured to receive a tooth, at least a first portion of the shell being constructed of a first rigid material; The second portion is constructed from a material having a second stiffness different from the first stiffness.

Special Publication No. 2004-507281

In the conventional dental instrument described in Patent Document 1 mentioned above, since the shell has a cavity formed to receive teeth, it is possible to correct the dentition.

However, when conventional dental appliances are used on a patient with a tongue habit, even if the dentition is corrected, the dentition may return to its original state of malocclusion due to the tongue habit. Therefore, there is a problem in that it takes a long time to correct the dentition.

The present invention has been made in view of these problems, and an object of the present invention is to provide an orthodontic tool that can correct individual teeth in the dentition and improve tongue habit.

In order to achieve this object, the invention according to claim 1 is an orthodontic appliance that is attached to cover a row of teeth and corrects each individual tooth of the row of teeth, the tool comprising: A main body that fits into the crown of a tooth to correct individual teeth, and an extension that extends from the main body toward the tooth root, and the front teeth of the dentition on the palatal side of the extension. A shape-changing portion is provided in which a portion having a different shape from other portions is provided in a portion corresponding to the middle portion, and the tip of the tongue comes into contact with the portion, thereby making it possible to concentrate consciousness on the portion. shall be.

Further, in addition to the configuration described in claim 1, the invention according to claim 2 is characterized in that the shape changing part is a protrusion, and the protrusion protrudes toward the palate side of the extension part into the oral cavity. It is characterized by being formed as follows.

Further, the invention according to claim 3 is characterized in that, in addition to the configuration according to claim 2, the protrusion portion has a protruding surface formed in a curved shape.

Moreover, the invention according to claim 4 is characterized in that, in addition to the configuration according to claim 2, the protruding portion of the protruding portion is formed in a linear shape.

Further, the invention according to claim 5 is characterized in that, in addition to the configuration according to claim 1, the shape changing portion is a through hole, and the tongue tip is formed into the through hole. shall be.

Further, in addition to the configuration described in any one of claims 1 to 5, the invention according to claim 6 provides that the cut line of the end edge of the extension part is located between the neck part and the gingival part of each tooth. It is characterized by a shape that is more gentle than a shape with connected border lines.

According to the invention set forth in claim 1, a portion having a shape different from other portions is provided in a portion corresponding to between the front teeth of the dentition portion on the palate side of the extension portion, and the tip of the tongue comes into contact with this portion. By having a shape-changing part that allows you to focus your attention on this part, by touching the tip of your tongue to the shape-changing part, you can always keep the tongue in the correct position for patients with tongue habit. This makes it possible to correct individual teeth in the dentition and improve tongue habit.

Further, according to the invention as set forth in claim 2, the shape changing portion is a protrusion, and the protrusion is formed to protrude toward the oral cavity on the palate side of the extension portion. A protrusion can be formed on the tongue, and the tongue can always be guided to the correct position.

Further, according to the third aspect of the invention, since the protruding surface of the protruding part is formed in a curved shape, it is possible to eliminate discomfort when the tongue tip comes into contact with the protruding part.

Further, according to the fourth aspect of the invention, since the protruding portion of the protruding portion is formed in a linear shape, the protruding portion can be easily formed.

Further, according to the invention set forth in claim 5, the shape changing portion is a through hole, and the through hole is formed so that the tip of the tongue can fit therein, so that it is possible to always concentrate on the through hole. , it becomes possible to improve tongue habit early.

Further, according to the invention set forth in claim 6, the cut line of the end edge of the extension portion is formed more gently than the shape connecting the boundary line between the tooth neck and the gingival portion of each tooth. It becomes possible to increase the strength of the orthodontic appliance.

FIG. 1 is a perspective view showing a state in which the orthodontic appliance according to the first embodiment of the present invention is attached to the maxillary dentition. FIG. 2 is a bottom view showing a state in which the orthodontic appliance according to the first embodiment of the present invention is attached to the maxillary dentition. 3 is a sectional view taken along line AA in FIG. 2. FIG. FIG. 3 is an enlarged front view showing the protrusion shown in FIG. 2; 5 is a sectional view taken along line BB in FIG. 4. FIG. FIG. 1 is a longitudinal cross-sectional view showing a state in which the orthodontic appliance according to the first embodiment of the present invention is installed in the oral cavity. FIG. 7 is an enlarged sectional view showing section C in FIG. 6; It is an enlarged front view showing a modification of the protrusion of the orthodontic tool according to the first embodiment of the present invention. FIG. 7 is a bottom view showing a state in which the orthodontic appliance according to the second embodiment of the present invention is attached to the maxillary dentition. 9 is a sectional view taken along line DD in FIG. 9. FIG. It is a longitudinal cross-sectional view showing a state where the orthodontic appliance according to the second embodiment of the present invention is installed in the oral cavity. 12 is an enlarged sectional view showing section E in FIG. 11. FIG.

Embodiments of the orthodontic appliance according to the present invention will be described below.

1 to 7 show a first embodiment of an orthodontic appliance according to the present invention.

FIG. 1 is a perspective view showing a state in which an orthodontic appliance according to a first embodiment of the present invention is attached to an upper jaw row of teeth. FIG. 2 is a bottom view showing a state in which the orthodontic appliance according to the first embodiment of the present invention is attached to the maxillary dentition. FIG. 3 is a cross-sectional view taken along line AA in FIG. 2. FIG. 4 is an enlarged front view showing the protrusion shown in FIG. 2. FIG. FIG. 5 is a sectional view taken along line BB in FIG. 4. FIG. 6 is a longitudinal sectional view showing a state in which the orthodontic appliance according to the first embodiment of the present invention is installed in the oral cavity. FIG. 7 is an enlarged sectional view showing section C in FIG. 6.

In each of the following embodiments, when the orthodontic appliance is inserted into the oral cavity and attached to the maxillary dentition, the front teeth side is referred to as the front side, the back tooth side is referred to as the rear side, and the palate side (tongue side) is referred to as the inner side. , the buccal side (labial side) is described as the outer side.

As shown in FIGS. 1 and 2, the orthodontic appliance 10 is a mouthpiece type that is inserted into the oral cavity 1 and attached to, for example, the upper jaw row of teeth 2. As shown in FIGS. Here, the maxillary tooth row section 2 has front teeth 3, canine teeth 4, and back teeth 5. The front teeth 3 are incisors and include left and right central incisors 3a and left and right lateral incisors 3b. The back teeth 5 are molar teeth and include left and right first and second premolars, and left and right first and second molars.

The orthodontic appliance 10 of this embodiment is a molded product (aligner or retainer) that moves the individual teeth of the maxillary tooth row 2 in the direction in which they should be aligned, or molds the moved teeth so that they do not return to their original positions. be.

For example, the orthodontic tool 10 is prepared in stages in a plurality of different sizes or different hardnesses, and is periodically replaced to proceed with orthodontic treatment. For example, the orthodontic appliance 10 that is prepared first is a tooth after each tooth has been moved approximately 0.2 to 0.5 mm from the initial position of each tooth in the maxillary dentition 2 of the patient. It is made to correspond to the row shape. When this orthodontic appliance 10 is worn for about 1 to 3 weeks, the individual teeth of the upper jaw dentition 2 will gradually move. Thereafter, orthodontic tools 10 corresponding to the shape of the individual teeth are sequentially prepared, and the patient's orthodontic treatment is performed by moving the individual teeth little by little.

Note that orthodontics in this embodiment includes not only correcting by moving individual teeth in the direction in which they should be aligned, but also retaining to prevent the teeth that have been moved by correction from returning to their original positions. . In the following embodiment, a case will be described in which correction is performed by moving individual teeth in the direction in which they should be aligned.

As shown in FIG. 3, the orthodontic appliance 10 of the present embodiment has a main body portion having an inner surface that has approximately the same shape as the crown portions 6 of the front teeth 3, canine teeth 4, and back teeth 5 of the patient's upper jaw dentition 2. 10a, and a palatal extension part 11b and a buccal extension part 11c, which extend from the main body part 10a toward the tooth root 7 toward the palate and the buccal side, respectively. The main body portion 10a is fitted into each tooth in the patient's oral cavity 1 to proceed with correction. Here, the main body part 10a is fitted into the tooth crown part 6 of the maxillary tooth row part 2 to move the individual teeth in the direction in which they should be aligned, thereby correcting the teeth.

The orthodontic appliance 10 of this embodiment is entirely made of an elastic resin material, and is integrally molded to a thickness of, for example, 0.40 to 0.50 mm. Specifically, the resin material is selected from urethane resins such as polyurethane, silicone resins, polyolefin resins, styrene resins, acrylic resins, and the like. Note that the orthodontic appliance 10 is molded into a shape that corresponds to the patient's dentition after orthodontic treatment, unlike a shape that corresponds to the patient's dentition before the appliance is installed. That is, when a patient puts on the orthodontic appliance 10 for the first time, the orthodontic appliance 10 is fitted while being subjected to a load and slightly elastically deformed. Due to its elasticity, the orthodontic appliance 10 thus deformed generates a force that restores it to the initially integrally molded shape, and gradually aligns the teeth in a direction that corrects the alignment. The resin material is desirably colorless and transparent or milky white, so that when inserted into the oral cavity 1, it is not noticeable that it is attached to the maxillary dentition 2, resulting in excellent aesthetics.

The main body part 10a has such hardness that it covers all the teeth of the upper tooth row part 2 in the oral cavity 1, that is, the front teeth 3, canine teeth 4, and back teeth 5 of the upper jaw tooth row part 2, and maintains a predetermined shape. The main body portion 10a is formed in a shape that follows the dental arch of the maxillary tooth row portion 2, and is formed to fit into the crown portions 6 of the individual teeth of the front teeth 3, canine teeth 4, and back teeth 5. ing. The main body part 10a is integrally provided with an extension part 11 made of the same resin material as the main body part 10a so as to extend to the gingival part 8 located on the tooth root 7 side.

As shown in FIGS. 1 and 2, the palatal side extension part 11b and the buccal side extension part 11c have a cut line 11a at the end edge that is the boundary line between the tooth neck and the gingival part 8 of each tooth (tooth neck line). ) is formed more gently than the shape connected. In other words, the cut line 11a is a line that connects the neck of each tooth at a position approximately 0.5 to 2.0 mm deeper than the deepest point (a line with a sharp three-dimensional curve that also matches the shape of the gingiva). It is made of continuous lines with few lines (lines that are almost straight when viewed from the front). In addition, the palatal side extension part 11b and the buccal side extension part 11c have contact surfaces on the gingival part 8 side that are approximately the same as the surface shapes of the palate side and buccal side, respectively, so that they come into close contact with the gingival part 8 located on the tooth root 7 side. are formed in the same shape.

The palatal side extension part 11b becomes a part that extends from the front teeth 3 of the maxillary dentition part 2 toward the tooth roots 7 when the orthodontic appliance 10 is worn, as shown in FIGS. 2 and 3. The palate side extension part 11b is provided with a minute protrusion part 12 as a shape changing part formed so as to protrude toward the inside of the oral cavity. As shown in FIGS. 6 and 7, this protrusion 12 is a part of the palate side extension 11b that corresponds to between the front teeth 3 of the maxillary tooth row part 2 and has a different shape from other parts. By contacting the tongue tip 21 of the tongue portion 20 with the protruding portion 12), the patient's consciousness is focused on this portion (protruding portion 12). The projection 12 is provided at a position where the tongue tip 21 of the patient's tongue 20 can come into contact with it when the orthodontic appliance 10 is worn. The protrusion 12 is formed in the palate-side extension 11b at a position corresponding to the midline L1 between the left central incisor 3a and the right central incisor 3a of the front teeth 3 of the maxillary tooth row section 2. There is. The protrusion 12 is a line connecting the deepest points of the cervical parts of the left and right central incisors 3a and the left and right lateral incisors 3b (a continuous line with few three-dimensional sharp bends to match the shape of the gingiva). It is formed in a region corresponding to the cut line 11a side of the incisor neck line L2. The location where the protrusion 12 is provided is a spot position where the tongue tip 21 of the tongue 20 is kept in contact so that the user remembers the correct position of the tongue 20.

Here, the protrusion 12 is a part corresponding to the midline L1 between the left central incisor 3a and the right central incisor 3a of the front teeth 3 of the maxillary tooth row part 2, and is located on the incisor tooth neck. It may be placed at any location as long as it is located on the line L2 and further corresponds to the cut line 11a side of the incisor neck line L2.

As shown in FIGS. 3 to 5, the protruding portion 12 has a protruding surface 12a formed in a hollow curved shape. The protrusion 12 of this embodiment is formed in a dome (semispherical) shape, and has a diameter of, for example, about 2 mm, and less than 3 mm. Here, if the diameter of the protrusion 12 is larger than that, there is a problem that it becomes troublesome for the patient when wearing the orthodontic appliance 10. The size may be such that the patient's consciousness is focused on 12.

The protrusion 12 is provided with a crimping tool, for example, at a portion corresponding to between the left central incisor 3a and the right central incisor 3a of the front teeth 3 of the maxillary tooth row section 2 in the palate side extension 11b provided in the orthodontic appliance 10. It can be easily formed using tools such as. Furthermore, the protrusion 12 may be integrally formed when molding the orthodontic appliance 10, the palatal extension 11b, and the buccal extension 11c. Note that the protrusion 12 may be provided separately by bonding it to the palate-side extension 11b of the orthodontic appliance 10 with an adhesive.

Next, the operation of the orthodontic tool 10 of this embodiment will be explained.

When the orthodontic tool 10 of this embodiment is used as an aligner, it is inserted into the oral cavity 1 as shown in FIGS. 6, it fits into the crowns 6 of the individual teeth of the front teeth 3, canine teeth 4, and back teeth 5, and gradually moves the individual teeth in the direction in which they should be aligned, thereby correcting the teeth. When this orthodontic appliance 10 is worn, the palatal side extension part 11b and the buccal side extension part 11c are connected to the palatal side and buccal side, the front teeth 3, the canine teeth 4, and the back teeth 5, respectively, as shown in FIGS. 2 and 3. It is designed to come into contact with the gingiva part 8.

In addition, in the conventional orthodontic appliance different from this embodiment, there is one in which the cut line is aligned with the cervical part without forming the palatal side extension part 11b and the buccal side extension part 11c (only the main body part 10a is used). ). In this type of orthodontic appliance, there is no resin material in the area corresponding to the gingival region 8, so it appears that gingival recession can be prevented, but the lack of resin material results in insufficient strength and elasticity, and the Correction may not progress.

On the other hand, in this embodiment, the resin material is used up to the part corresponding to the gingival part 8, and the palatal side extension part 11b and the buccal side extension part 11c which extend toward the tooth root part 7 side so as to contact the gingival part 8 are provided. By forming this, it becomes possible to increase the strength and improve the orthodontic effect.

Furthermore, when the orthodontic appliance 10 is worn, the tongue tip 21 of the patient's tongue portion 20 can come into contact with the protrusion 12 provided at the portion corresponding to the central incisors 3a of the palate-side extension portion 11b. Therefore, in this embodiment, in order to remember the correct position of the tongue part 20, the protrusion part 12 is provided at a spot position, and the tongue tip 21 of the tongue part 20 is always brought into contact with the protrusion part 12 at this position. I try to concentrate on part 12. This allows the patient's oral muscle function to be adjusted and tongue habit to be improved.

Note that the orthodontic tool 10 of this embodiment can also be used as a retainer to prevent the moved teeth from returning to their original positions after being moved in the direction in which they should be aligned.

As described above, according to this embodiment, a portion having a different shape from other portions is provided in the portion corresponding to between the front teeth 3 of the maxillary tooth row portion 2 in the palatal side extension portion 11b, and the tongue tip 21 comes into contact with this portion. By providing the protrusion 12 that allows the user to concentrate on this area, by bringing the tongue tip 21 into contact with the protrusion 12, patients with tongue habit can always keep their tongue in the correct position. This makes it possible to correct the individual teeth of the maxillary dentition 2 and improve the tongue habit. Furthermore, by improving the patient's tongue habit, it is possible to obtain the effect that the individual teeth of the maxillary dentition 2 that have been once corrected will not return to the original malocclusion state.

According to the present embodiment, the protrusion 12 is formed to protrude into the palatal side extension 11b, so that the palatal side extension 11b can be easily formed, and the tongue 20 can be kept at all times. It can guide you to the correct position.

Furthermore, according to the present embodiment, the protrusion 12 is formed at a location corresponding to the midline L1 between the central incisors 3a of the maxillary tooth row section 2, so there is no possibility that that location will become a spot position. Due to its height, the entire tongue 20 can always be guided to the correct position.

Further, according to the present embodiment, the protrusion surface 12a of the protrusion 12 is formed in a curved shape, so that discomfort when the tongue tip 21 comes into contact with it can be eliminated.

According to the present embodiment, the cut line 11a at the edge of the palatal side extension part 11b and the buccal side extension part 11c crosses the boundary line (dental neck line) between the tooth neck part and the gingival part 8 of each tooth. By forming the cut line 11a more gently than in a connected shape, the overall strength is increased compared to a shape in which the cut line 11a connects the boundary line between the tooth neck and the gingival region 8. (prevent damage).
[Modification of the first embodiment of the invention]
Next, a modification of the first embodiment of the present invention will be described.

FIG. 8 is an enlarged front view showing a modification of the protrusion of the orthodontic tool according to the first embodiment of the present invention. In addition, in this modification, the same reference numerals are attached to the same or corresponding parts as in the first embodiment, and the description thereof will be omitted.

As shown in FIG. 8, the protruding part 13 as the shape changing part of this modification is formed in a linear shape, and the protruding surface 13a that protrudes is formed in a planar shape, and its length direction is the tooth axis of the front tooth 3. It extends in a direction perpendicular to direction X. This protrusion 13 is formed in the palate side extension part 11b at a position corresponding to between the left central incisor 3a and the right central incisor 3a of the front teeth 3 of the maxillary tooth row part 2, as in the embodiment described above. has been done. Further, the location where the protrusion 13 is provided is a spot position where the tip 21 of the tongue 20 is kept in contact so that the user remembers the correct position of the tongue 20.

As described above, according to this modification, the protruding portion of the protruding portion 13 is formed in a linear shape, so that the protruding portion 13 can be easily formed.
[Second embodiment of orthodontic appliance]
FIG. 9 is a bottom view showing a state in which the orthodontic appliance according to the second embodiment of the present invention is attached to the maxillary dentition. FIG. 10 is a cross-sectional view taken along line DD in FIG. FIG. 11 is a longitudinal sectional view showing a state in which the orthodontic appliance according to the second embodiment of the present invention is installed in the oral cavity. FIG. 12 is an enlarged sectional view showing section E in FIG. 11. In addition, in this embodiment, the same reference numerals are given to the same or corresponding parts as in the first embodiment, and redundant explanation will be omitted.

As shown in FIGS. 9 and 10, in this embodiment, a through hole 15 as a shape changing portion is formed in place of the protrusion 12 of the first embodiment. This through-hole 15 is a part of the palate-side extension part 11b that corresponds to between the front teeth 3 of the maxillary tooth row part 2 and has a different shape from other parts, and this part (through-hole 15) has a tongue tip of the tongue part 20. 21 makes contact with the patient, thereby concentrating the patient's consciousness on this portion (through hole 15).

The diameter of the through hole 15 is, for example, about 2 mm, and less than 3 mm. The diameter of the through hole 15 may be such that the tongue tip 21 of the tongue portion 20 comes into contact with the patient so as to be sucked therein, and the patient's consciousness is concentrated on the through hole 15.

The through hole 15 is formed in the palate side extension part 11b at a part corresponding to the midline L1 between the left central incisor 3a and the right central incisor 3a of the front teeth 3 of the upper tooth row part 2. There is. The through hole 15 is formed by a line connecting the deepest points of the cervical parts of the left and right central incisors 3a and the left and right lateral incisors 3b (a continuous line with few three-dimensional sharp bends, in accordance with the shape of the gingiva). (a line close to a straight line in front view), that is, on the incisor neck line L2, and is formed in a region corresponding to the cut line 11a side with respect to the incisor neck line L2.

In order to form the through hole 15 in the above-mentioned part of the palate side extension part 11b, for example, by opening it using a round bur of a dental technology engine, accurate penetration can be achieved without forming a burr at the opening end. The hole 15 can be easily formed.

Therefore, in the present embodiment, when the orthodontic appliance 10 is worn, the tongue tip 21 of the patient's tongue portion 20 enters the through hole 15 provided in the region corresponding to between the central incisors 3a of the palatal side extension portion 11b. Contact so that it will be absorbed. Therefore, in this embodiment, in order to remember the correct position of the tongue 20, the through hole 15 is provided at a spot position, and the tongue tip 21 of the tongue 20 is always in contact with the open end of the through hole 15 at this position. This causes the patient to concentrate on the through hole 15. This allows the patient's oral muscle function to be adjusted and tongue habit to be improved.

According to the present embodiment, the tongue tip 21 is formed in the through hole 15 so that the tongue tip 21 can be inserted into the through hole 15, so that the user can always concentrate on the through hole 15 and improve tongue habit at an early stage. It becomes possible.

Further, according to the present embodiment, the through hole 15 is formed at a portion corresponding to the midline L1 between the central incisors 3a of the front teeth 3, so that the tongue portion 20 can be always guided to the correct position. I can do it.
[Other embodiments of the invention]
Although embodiments of the present invention have been described, these embodiments are presented as examples and are not intended to limit the scope of the invention. These embodiments can be implemented in various other forms, and various omissions, substitutions, changes, and combinations can be made without departing from the gist of the invention. These embodiments are included within the scope and gist of the invention as well as within the scope of the invention described in the claims and its equivalents.

In addition, in the first embodiment and the modified example described above, an example was described in which the protrusions 12 and 13 were formed on the palate side extension part 11b corresponding to the front teeth 3 of the upper jaw row of teeth 2, but the invention is not limited to this. It goes without saying that it may be formed on the palatal side extension part corresponding to the front teeth of the lower jaw, but it may also be formed on both the upper jaw row of teeth 2 and the lower jaw row of teeth.

Further, in the first embodiment, the protruding surface 12a of the protrusion 12 is formed into a curved shape, and in the modified example, the protruding surface 12a is formed into a linear shape. However, the present invention is not limited to this. For example, it may be formed in any other shape such as a truncated polygonal pyramid or a truncated cone, and a plurality of shapes may be provided. In addition, when a plurality of them are provided, their shapes may be different from each other.

Furthermore, in the first embodiment and the modified example, the protrusions 12 and 13 are formed on the palate side extension 11b, and in the second embodiment, the through hole 15 is formed on the palate side extension 11b. However, without being limited thereto, for example, a linear slit may be formed along a region corresponding to the midline L1 between the central incisors 3a of the maxillary tooth row section 2 from the cut line 11a of the palatal side extension section 11b. Alternatively, an inverted V-shaped notch may be formed. When formed in this way, it is desirable that the corners on both sides of the slit or notch be chamfered with a C or R to give a shape that does not damage the tongue tip 21.

1 Oral cavity 2 Maxillary dentition 3 Front teeth 4 Canines 5 Back teeth 6 Crowns 7 Roots 8 Gingiva 10 Orthodontic appliance 10a Main body 11a Cut line 11b Palatal extension 11c Buccal extension 12 Projection (shape change) Department)
12a Projection surface 13 Projection (shape changing part)
13a Projection surface 15 Through hole (shape changing part)
20 tongue part 21 tongue tip

Claims (6)

An orthodontic appliance for correcting individual teeth in the dentition by being attached to cover the dentition,
A main body part that fits into the crown part of the tooth row part to correct each tooth, and an extension part formed to extend from the main body part toward the tooth root side,
A portion having a different shape from other portions is provided in a portion corresponding to between the front teeth of the dentition portion on the palate side of the extension portion, and the tip of the tongue comes into contact with the portion, thereby making it possible to concentrate consciousness on the portion. An orthodontic appliance characterized by being provided with a shape-changeable part. The orthodontic appliance according to claim 1, wherein the shape changing part is a protrusion, and the protrusion is formed so as to protrude into the oral cavity on the palate side of the extension part. The orthodontic appliance according to claim 2, wherein the protruding portion has a protruding surface formed in a curved shape. The orthodontic appliance according to claim 2, wherein the protruding portion has a linear shape. The orthodontic appliance according to claim 1, wherein the shape changing portion is a through hole, and the tongue tip is inserted into the through hole. Any one of claims 1 to 5, wherein the cut line of the end edge of the extension part is formed more gently than a shape connecting the boundary line between the tooth neck and the gingival part of each tooth. Orthodontic appliances as described in section.

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