Orthodontic appliances

Abstract

To provide an orthodontic appliance that can be used for treatment to move the maxillary dentition in the front-rear direction and can reduce the burden on a patient. [Solution] The orthodontic device 1 comprises a one-side posterior fixing portion 2 and an other-side posterior fixing portion 3 configured to be attached to one side and the other side of the maxilla A, respectively, based on the midline palatal suture C, a first adjustment portion 4 that can adjust the distance between the one-side posterior fixing portion 2 and the other-side posterior fixing portion 3, a one-side anterior fixing portion 5 and the other-side anterior fixing portion 6 configured to be attached to one side and the other side of the premaxilla B, respectively, based on the midline palatal suture C, a second adjustment portion 7 that can adjust the distance between the one-side posterior fixing portion 2 and the one-side anterior fixing portion 5, and a third adjustment portion 8 that can adjust the distance between the other-side posterior fixing portion 3 and the other-side anterior fixing portion 6.

Description

[Technical Field]

[0001] The present invention relates to an orthodontic appliance used in orthodontic treatment of the maxilla. [Background technology]

[0002] Conventionally, the appliance disclosed in Patent Document 1 has been known as one used for treating malocclusion. The appliance disclosed in Patent Document 1 includes a pair of bodies and a screw portion for adjusting the distance between the bodies. Each body is attached to the left and right sides of the maxilla, sandwiching the median palatine suture that extends in the anterior-posterior direction in the center of the maxilla. When the screw portion is rotated to widen the distance between the bodies, the maxilla moves outward to the left and right, thereby expanding the maxillary dentition in the lateral direction. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 2023-152963 Summary of the Invention [Problem to be solved by the invention]

[0004] When it is necessary to move the maxillary dentition in the anterior-posterior direction in the treatment of malocclusion, conventionally, a surgical procedure is performed to open the maxilla, move the premaxilla located in front of the maxilla, and fix it in a predetermined position. However, surgical procedures involve the risk of bleeding and anesthesia, which places a heavy burden on the patient. Therefore, there is a need for a treatment that can reduce the burden on the patient even when it is necessary to move the maxillary dentition in the anterior-posterior direction.

[0005] In view of these points, the present invention aims to provide an orthodontic appliance that can be used in treatment to move the maxillary dentition in the anterior-posterior direction and that can reduce the burden on the patient. [Means for solving the problem]

[0006] The present invention is an orthodontic device comprising a one-side posterior fixing portion and an other-side posterior fixing portion configured to be attached to one side and the other side of the maxilla, respectively, based on the midline palatal suture, a first adjustment portion that can adjust the distance between the one-side posterior fixing portion and the other-side posterior fixing portion, a one-side anterior fixing portion and an other-side anterior fixing portion configured to be attached to one side and the other side of the premaxilla, respectively, based on the midline palatal suture, a second adjustment portion that can adjust the distance between the one-side posterior fixing portion and the one-side anterior fixing portion, and a third adjustment portion that can adjust the distance between the other-side posterior fixing portion and the other-side anterior fixing portion. [Effects of the Invention]

[0007] With the orthodontic appliance according to the present invention, when the first adjustment part is moved, the maxilla moves left and right via the one-side posterior fixing part and the other-side posterior fixing part, thereby loosening the incisive suture that fuses the maxilla and premaxilla. Then, when the second adjustment part and the third adjustment part are moved in this state, the maxilla and premaxilla are separated, allowing the premaxilla to move relative to the maxilla. In other words, the orthodontic appliance according to the present invention can adjust the maxillary dentition in the anterior-posterior direction without surgical procedures such as opening the maxilla, thereby reducing the burden on the patient. [Brief explanation of the drawings]

[0008] [Figure 1] 1 is a diagram schematically illustrating an embodiment of a correction device according to the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0009] Hereinafter, an embodiment of the orthodontic appliance according to the present invention will be described with reference to the drawings. Note that the materials, shapes, configurations, manufacturing methods, etc. of each component in the following description are merely examples, and can be modified as appropriate to obtain the same effects as the present invention.

[0010] Fig. 1 shows an orthodontic appliance 1 according to this embodiment attached to a patient's upper jaw, viewed from the perspective of facing the palate of the upper jaw. The teeth indicated by reference numerals in Fig. 1 are located on the right side of the upper jaw from the patient's perspective: a maxillary right central incisor UR1, a maxillary right lateral incisor UR2, a maxillary right canine UR3, a maxillary right first premolar UR4, a maxillary right second premolar UR5, a maxillary right first molar UR6, and a maxillary right second molar UR7; and located on the left side of the upper jaw from the patient's perspective: a maxillary left central incisor UL1, a maxillary left lateral incisor UL2, a maxillary left canine UL3, a maxillary left first premolar UL4, a maxillary left second premolar UL5, a maxillary left first molar UL6, and a maxillary left second molar UL7. In the following description, the terms "right" and "left" refer to the orientations relative to the patient. In this specification, the "maxillary molars" refer to the maxillary right first premolar UR4, maxillary right second premolar UR5, maxillary right first molar UR6, maxillary right second molar UR7, maxillary left first premolar UL4, maxillary left second premolar UL5, maxillary left first molar UL6, and maxillary left second molar UL7 in FIG. 1.

[0011] In Figure 1, symbol A indicates the maxilla, symbol B indicates the premaxilla, symbol C indicates the midpalatal suture, symbol D indicates the incisive suture, and symbol E indicates the incisive foramen.

[0012] In describing the orthodontic device 1 of this embodiment, the anchor screw will first be described. The anchor screw is formed in a roughly male-threaded shape, similar to the member designated by the reference numeral 53 in FIG. 2 of Japanese Patent No. 6557887, and is implanted in the patient's maxilla. A female thread is provided on the head of the anchor screw, and this female thread is configured to allow attachment of the low-profile fixation screw 50 shown in FIG. 1. As is clear from the fixation screw 50 shown in FIG. 1, one anchor screw of this embodiment is implanted on the right and left sides of the maxilla A, relative to the midpalatal suture C, in the vicinity of the midpalatal suture C and the incisive suture D, and one anchor screw is implanted on the right and left sides of the premaxilla B, relative to the midpalatal suture C, in the vicinity of the midpalatal suture C and the incisive suture D (laterally outward in the left-right direction relative to the incisive foramen E).

[0013] Next, we will explain the configuration of the orthodontic device 1 according to this embodiment. The orthodontic device 1 according to this embodiment includes a one-side posterior fixing part 2 and an other-side posterior fixing part 3 that are configured to be attached to one side (the right side for the patient) and the other side (the left side for the patient) of the maxilla A, respectively, based on the midline palatal suture C, and a first adjustment part 4 that can adjust the distance between the one-side posterior fixing part 2 and the other-side posterior fixing part 3.

[0014] The one-side rear fixing portion 2 includes a one-side rear first base portion 21, a one-side rear arm portion 22, a one-side rear second base portion 23, and a one-side rear connecting portion 24.

[0015] In this embodiment, the one-side rear first base portion 21 has a rectangular parallelepiped shape and is provided on the inside with a groove extending in the front-to-rear direction. As will be described in detail later, the one-side rear first base portion 21 has a hole into which a first guide portion 29 (described later) is inserted and a female thread portion into which the first screw portion 30 is threaded. The hole and the female thread portion extend in the left-to-right direction.

[0016] The one-side rear arm section 22 has a shape, for example, like a rod-shaped member bent into an L shape, and is disposed inside a groove formed in the one-side rear first base section 21 and integrally joined to the one-side rear first base section 21. The one-side rear first base section 21 and the one-side rear arm section 22 may be integrally joined by, for example, adhesive bonding or welding. The one-side rear first base section 21 and the one-side rear arm section 22 may also be formed in an integrated shape from the beginning, for example, by a 3D printer. The 3D printer's modeling method is not particularly limited, and may be, for example, a powder sintering additive manufacturing method (laser sintering), a photolithography method, or an inkjet method. The joining of the other parts described below can also be achieved by the above-mentioned means, and various methods are also used without being limited to these.

[0017] In this embodiment, the one-side rear arm portion 22 has a through-hole at its end closer to the one-side rear first base portion 21, into which the male thread portion of a fixing screw 50 is inserted, and by tightening the fixing screw 50 inserted into this through-hole, the one-side rear arm portion 22 is fixed to an anchor screw embedded in the right side of the maxillary bone A. In addition, the opposite end of the one-side rear arm portion 22 is provided with a one-side molar holder 22a configured to be attached to the maxillary right first molar UR6 by surrounding it.

[0018] In this embodiment, the one-side rear second base portion 23 is shaped like a rectangular parallelepiped. The one-side rear second base portion 23 has a hole and a female thread portion similar to those of the one-side rear first base portion 21. The hole and the female thread portion extend in the front-to-rear direction of the one-side rear second base portion 23.

[0019] In this embodiment, the one-side rear connecting portion 24 is rod-shaped, with one end integrally connected to the one-side rear first base portion 21 and the other end integrally connected to the one-side rear second base portion 23.

[0020] The other-side rear fixing portion 3 includes an other-side rear first base portion 25, an other-side rear arm portion 26, an other-side rear second base portion 27, and an other-side rear connecting portion 28.

[0021] The other-side posterior first base 25, the other-side posterior arm 26, the other-side posterior second base 27, and the other-side posterior connecting portion 28 are shaped to be symmetrical with the one-side posterior first base 21, the one-side posterior arm 22, the one-side posterior second base 23, and the one-side posterior connecting portion 24, respectively, with respect to the midpalatal suture C. That is, the other-side posterior first base 25 is provided with a hole extending in the left-right direction and into which the first guide portion 29 is inserted, and a female threaded portion into which the first screw portion 30 is threaded, similar to the hole and male threaded portion provided in the one-side posterior first base 21. The other-side posterior arm 26 is provided, at its end closer to the other-side posterior first base 25, with a through-hole into which the male threaded portion of a fixation screw 50 is inserted, and the other-side posterior arm 26 is fixed to an anchor screw implanted in the left side of the maxilla A by tightening the fixation screw 50 inserted into this through-hole. The other-side rear arm 26 has a second-side molar holder 26a at the opposite end thereof, which is configured to surround and attach to the maxillary left first molar UL6. When attaching the orthodontic appliance 1 to the patient's maxilla, the second-side rear arm 26 and the second-side molar holder 26a can be held with fingers, improving operability. When the second-side molar holder 26a is provided, various treatments can be performed on the outside of the maxillary dental arch by integrally connecting a bracket or the like provided with a wire or the like extending along the outside of the maxillary dental arch to the outer side (cheek side) of the maxillary dental arch of the second-side molar holder 26a. The second-side molar holder 26a is not limited to the ring-shaped one shown in the figure, and may be, for example, a pad-shaped one provided only on the inner side (lingual side) of the teeth. The effects of the second-side rear arm 26 and the second-side molar holder 26a are similar to those of the first-side rear arm 22 and the first-side molar holder 22a described above.

[0022] The first adjustment portion 4 includes a first guide portion 29 and a first screw portion 30 .

[0023] The first guide portions 29 support the one-side rear first base portion 21 and the other-side rear first base portion 25 so that they can slide in the left-right direction. The first guide portions 29 in this embodiment are rod-shaped and are inserted into holes provided in the one-side rear first base portion 21 and the other-side rear first base portion 25 described above. With the first guide portions 29 inserted into these holes, the one-side rear first base portion 21 and the other-side rear first base portion 25 can slide in the left-right direction while being supported by the first guide portions 29. A pair of first guide portions 29 are provided in the front and rear of the embodiment.

[0024] The first threaded portion 30 includes a disk-shaped portion located in the center of the first threaded portion 30 in the left-right direction, and a pair of male-threaded portions provided on both the left and right sides of the disk-shaped portion. The disk-shaped portion has a hole into which an operating rod for rotating the first threaded portion 30 is inserted. Of the pair of male-threaded portions, the right portion is threadedly engaged with the above-mentioned female-threaded portion of the one-side rear first base portion 21, and the left portion is threadedly engaged with the female-threaded portion of the other-side rear first base portion 25. Of the pair of male-threaded portions, either the right portion or the left portion is a right-handed thread, and the other of the right portion or the left portion is a left-handed thread.

[0025] In other words, by using the above-mentioned operating rod to rotate the first screw portion 30 in a predetermined direction, the one-side rear first base portion 21 and the other-side rear first base portion 25 can be moved so that the distance between them increases, and by rotating the first screw portion 30 in the opposite direction, the one-side rear first base portion 21 and the other-side rear first base portion 25 can be moved so that the distance between them decreases.

[0026] Furthermore, the orthodontic device 1 of this embodiment is equipped with a one-side anterior fixing portion 5 and an other-side anterior fixing portion 6 that are configured to be attached to one side (the right side from the patient's perspective) and the other side (the left side from the patient's perspective) of the premaxilla B, respectively, based on the midline palatal suture C, a second adjustment portion 7 that can adjust the distance between the one-side posterior fixing portion 2 and the one-side anterior fixing portion 5, and a third adjustment portion 8 that can adjust the distance between the other-side posterior fixing portion 3 and the other-side anterior fixing portion 6.

[0027] The one-side front fixing portion 5 includes a one-side front arm portion 31 and a one-side front base portion 32 .

[0028] In this embodiment, the one-side forearm portion 31 is rod-shaped, and one end is provided with a through-hole into which the male thread portion of the fixing screw 50 is inserted, and by tightening the fixing screw 50 inserted into this through-hole, the one-side forearm portion 31 is fixed to an anchor screw embedded in the right side of the premaxilla B. The opposite end of the one-side forearm portion 31 is integrally joined to the one-side front base portion 32.

[0029] The one-side front base portion 32 is shaped like a rectangular parallelepiped, similar to the one-side rear second base portion 23. The one-side front base portion 32 has a hole extending in the front-to-rear direction and a female screw portion, similar to those of the one-side rear second base portion 23.

[0030] The other-side rear fixed portion 3 includes an other-side front arm portion 33 and an other-side front base portion 34 .

[0031] The other-side forearm portion 33 and the other-side anterior base portion 34 are shaped to be symmetrical with respect to the one-side forearm portion 31 and the one-side anterior base portion 32, respectively, with respect to the midpalatal suture C. That is, one end of the other-side forearm portion 33 is provided with a through-hole into which the male thread portion of a fixation screw 50 is inserted, and by tightening the fixation screw 50 inserted into this through-hole, the other-side forearm portion 33 is fixed to an anchor screw embedded in the left side of the premaxilla B. The opposite end of the other-side forearm portion 33 is integrally connected to the other-side anterior base portion 34. The other-side anterior base portion 34 also has a hole and a female thread portion extending in the anterior-posterior direction, similar to those provided in the one-side anterior base portion 32.

[0032] The second adjustment portion 7 includes a second guide portion (not shown) and a second screw portion 35.

[0033] The second guide portion supports the one-side rear second base portion 23 and the one-side front base portion 32 so that they can slide in the front-rear direction. The second guide portion has a shape similar to that of the above-mentioned first guide portion 29, for example, and is inserted into holes provided in the above-mentioned one-side rear second base portion 23 and one-side front base portion 32, so that the one-side rear second base portion 23 and one-side front base portion 32 can slide in the front-rear direction while being supported by the second guide portion.

[0034] The second threaded portion 35 has a configuration similar to the first threaded portion 30 described above. That is, the second threaded portion 35 has a disk-shaped portion located in the center in the front-to-rear direction and a pair of male-threaded portions provided on both the front and rear sides of the disk-shaped portion. The disk-shaped portion has a hole into which an operating rod for rotating the second threaded portion 35 is inserted. Of the pair of male-threaded portions, the rear portion is threadedly engaged with the above-mentioned female-threaded portion provided on the one-side rear second base portion 23, and the front portion is threadedly engaged with the female-threaded portion provided on the one-side front base portion 32.

[0035] The third adjustment portion 8 includes a third guide portion (not shown) and a third screw portion 36 .

[0036] The third guide portion supports the other-side rear second base portion 27 and the other-side front base portion 34 so that they can slide in the front-rear direction. The third guide portion has the same shape as the second guide portion, and is inserted into holes provided in the above-mentioned other-side rear second base portion 27 and the other-side front base portion 34, so that the other-side rear second base portion 27 and the other-side front base portion 34 can slide in the front-rear direction while being supported by the third guide portion.

[0037] The third threaded portion 36 has a configuration similar to the second threaded portion 35 described above. That is, the third threaded portion 36 includes a disk-shaped portion located in the center in the front-to-rear direction and a pair of male-threaded portions provided on both the front and rear sides of the disk-shaped portion. The disk-shaped portion has a hole into which an operating rod for rotating the third threaded portion 36 is inserted. Of the pair of male-threaded portions, the rear portion is threadedly engaged with the above-mentioned female-threaded portion provided on the other-side rear second base portion 27, and the front portion is threadedly engaged with the female-threaded portion provided on the other-side front base portion 34.

[0038] The second threaded portion 35 and the third threaded portion 36 can be operated in the same manner as the first threaded portion 30 using the operating rod described above. That is, when the second threaded portion 35 is rotated in a predetermined direction using the operating rod, the one-side rear second base portion 23 and the one-side front base portion 32 can be moved so as to increase the distance between them, and when the second threaded portion 35 is rotated in the opposite direction, the one-side rear second base portion 23 and the one-side front base portion 32 can be moved so as to decrease the distance between them. Similarly, when the third threaded portion 36 is rotated in a predetermined direction using the operating rod, the other-side rear second base portion 27 and the other-side front base portion 34 can be moved so as to increase the distance between them, and when the third threaded portion 36 is rotated in the opposite direction, the other-side rear second base portion 27 and the other-side front base portion 34 can be moved so as to decrease the distance between them.

[0039] Next, a method of using the orthodontic device 1 according to this embodiment will be described. First, as shown in FIG. 1, the orthodontic device 1 is attached to the patient's maxilla. When the first screw portion 30 is rotated in a predetermined direction in this state, the one-side posterior first base portion 21 and the other-side posterior first base portion 25 move so as to increase the distance between them. The one-side posterior first base portion 21 is integrally connected to the one-side posterior arm portion 22, which is fixed to an anchor screw implanted on the right side of the maxilla A. The other-side posterior first base portion 25 is integrally connected to the other-side posterior arm portion 26, which is fixed to an anchor screw implanted on the left side of the maxilla A. Therefore, by rotating the first screw portion 30 so as to increase the distance between the one-side posterior first base portion 21 and the other-side posterior first base portion 25, the maxilla A moves outward to the left or right, with the midpalatal suture C as the boundary. In this embodiment, the one-side molar holder 22a provided at the other end of the one-side rear arm portion 22 is attached to the maxillary right first molar UR6. That is, the one-side rear arm portion 22 is fixed to the right maxilla A at one end near the midpalatal suture C and at the other end at the maxillary right first molar UR6. Therefore, when the first screw portion 30 is rotated, the force acting on the right maxilla A acts not only on the inner side in the left-right direction where the anchor screw is embedded, but also on the outer side in the left-right direction where the maxillary right first molar UR6 is located. Also, in this embodiment, the other-side molar holder 26a provided at the other end of the other-side rear arm portion 26 is attached to the maxillary left first molar UL6. That is, since one end of the other-side rear arm portion 26 is fixed to the left maxilla A near the midline palatal suture C and the other end is fixed to the maxillary left first molar UL6, when the first screw portion 30 is rotated, the force acting on the left maxilla A acts not only on the inner side in the left-right direction where the anchor screw is embedded, but also on the outer side in the left-right direction where the maxillary left first molar UL6 is located. Therefore, it is possible to prevent force from being applied locally to the right and left maxilla A, allowing them to move stably.

[0040] The maxilla A and the premaxilla B are fused at the incisive suture D. When the first screw portion 30 is rotated in a predetermined direction to move the maxilla A outward in the left-right direction as described above, a force is applied to the incisive suture D in the left-right direction, thereby loosening the fusion at the incisive suture D. Rotating the second screw portion 35 in a predetermined direction moves the one-side posterior second base 23 and the one-side anterior base 32 so as to increase the distance between them. Rotating the third screw portion 36 in a predetermined direction moves the other-side posterior second base 27 and the other-side anterior base 34 so as to increase the distance between them. As described above, the one-side anterior base 32 is integrally connected to the one-side forearm 31, and the one-side forearm 31 is fixed to an anchor screw implanted in the right side of the premaxilla B. The other-side anterior base 34 is integrally connected to the other-side forearm 33, and the other-side forearm 33 is fixed to an anchor screw embedded in the left side of the premaxilla B. That is, when the second screw portion 35 and the third screw portion 36 are rotated, a force is applied forward to the premaxilla B. Therefore, when the second screw portion 35 and the third screw portion 36 are rotated while the fusion at the incisive suture D is loosened, the premaxilla B separates from the maxilla A, allowing the premaxilla B to move forward, and therefore the maxillary dentition can be adjusted so that it widens forward. In this embodiment, one end of the one-side forearm portion 31 is fixed to the premaxilla B near the incisive suture D (on the right side of the incisive foramen E), and one end of the other-side forearm portion 33 is fixed to the premaxilla B near the incisive suture D (on the left side of the incisive foramen E), so that when the second screw portion 35 and the third screw portion 36 are rotated, a force is applied to the premaxilla B near the incisive suture D. Therefore, the premaxilla B, which is fused to the maxilla A at the incisive suture D, becomes more likely to separate from the maxilla A, and the maxillary dentition can be moved forward as intended.

[0041] If rotating the first screw portion 30 in a predetermined direction to move the maxilla A outward in the left-right direction is not enough to sufficiently loosen the fusion at the incisive suture D, it is effective to repeat the following operation: rotating the first screw portion 30 in the opposite direction to narrow the gap between the one-side rear second base portion 23 and the one-side anterior base portion 32, and then rotating the first screw portion 30 in the predetermined direction again. In other words, this operation repeatedly applies a force in the left-right direction to the incisive suture D, which makes it possible to sufficiently loosen the fusion at the incisive suture D, and the premaxilla B, which is fused to the maxilla A at the incisive suture D, becomes even easier to separate from the maxilla A.

[0042] In this way, the orthodontic device 1 of this embodiment can separate the premaxilla B from the maxilla A without performing a surgical procedure such as opening the maxilla. Furthermore, the maxilla A can be moved left and right depending on the rotation direction of the first screw portion 30, and the premaxilla B can be moved in the front-back direction depending on the rotation direction of the second screw portion 35 and the third screw portion 36, so the maxillary dentition can be adjusted left and right and front-back.

[0043] Although one embodiment of the present invention has been described above, the present invention is not limited to the specific embodiment, and unless otherwise specifically limited in the above description, various modifications and variations are possible within the spirit and scope of the present invention as defined in the claims. For example, the configuration of the above-described embodiment can be appropriately added or deleted. Furthermore, the effects of the above-described embodiment are merely examples of the effects resulting from the present invention, and do not mean that the effects of the present invention are limited to the above-described effects.

[0044] For example, in this embodiment, both the one-side molar holder 22a and the other-side molar holder 26a are provided. However, only one of them may be provided, or both may be omitted. Note that, if the one-side molar holder 22a or the like is omitted, the one-side rear arm portion 22 or the like may extend from the portion fastened to the anchor screw by the fixing screw 50 to the portion integrally connected to the one-side rear first base portion 21 or the like. Furthermore, the one-side molar holder 22a and the other-side molar holder 26a are configured to be attached to the maxillary right first molar UR6 and the maxillary left first molar UL6, respectively. However, they may also be configured to be attached to other molars, such as the maxillary right second premolar UR5 and the maxillary left second premolar UL5. The locations and number of anchor screws are not limited to those shown in the drawings and can be changed as appropriate for each patient. Furthermore, the first screw portion 30, the second screw portion 35, and the third screw portion 36 described above are rotated by inserting an operating rod into a hole provided in the center, but this is not limited to this. For example, the outer shape of the center may be elliptical or polygonal, and the first screw portion 30 may be rotated with an operating rod having a recess that fits the outer shape of the center (as an example, the outer shape of the center of the first screw portion 30 may be hexagonal, and the first screw portion 30 may be rotated with a wrench with a U-shaped tip). [Explanation of symbols]

[0045] 1: Orthodontic appliances 2: One side rear fixed part 3: Other side rear fixed part 4:First adjustment section 5: One side front fixing part 6: Other side front fixed part 7:Second adjustment section 8:Third adjustment section 21: One side rear first base 22: Rear arm on one side 22a: One-sided molar holder 23: One side rear second base 24: One side rear connection part 25: Other side rear first base 26: Other side rear arm 26a: Other side molar holding part 27: Other side rear second base 28: Other side rear connection part 29: First guide section 30: First screw part 31: One side front arm 32: One side anterior base 33: Other side front arm 34:Anterior base on the other side 35: Second screw part 36: Third screw part 50: Fixing screw A: Maxilla B: Premaxilla C: Midpalatal suture D: Incisor suture E: incisor foramen UL1: Maxillary left central incisor UL2: Maxillary left lateral incisor UL3: Upper left canine UL4: Maxillary left first premolar UL5: Maxillary left second premolar UL6: Maxillary left first molar UL7: Maxillary left second molar UR1: Upper right central incisor UR2: Upper right lateral incisor UR3: Upper right canine UR4: Upper right first premolar UR5: Upper right second premolar UR6: Upper right first molar UR7: Upper right second molar

Claims

1. a one-side posterior fixing portion and an other-side posterior fixing portion configured to be attached to one side and the other side of the maxilla, respectively, based on the midpalatal suture; a first adjustment unit that adjusts the distance between the one-side rear fixing portion and the other-side rear fixing portion; a one-side anterior fixing portion and an other-side anterior fixing portion configured to be attached to one side and the other side of the premaxilla, respectively, with the midpalatal suture as a reference; a second adjustment unit that adjusts the distance between the one-side rear fixing portion and the one-side front fixing portion; a third adjustment portion that can adjust the distance between the other-side rear fixing portion and the other-side front fixing portion.

2. The orthodontic appliance according to claim 1 , wherein at least one of the one-side posterior fixing portion and the other-side posterior fixing portion has a molar holding portion configured to be attached to a molar of the maxilla.

Images