Dental treatment system

Abstract

The application discloses a dental treatment system, which comprises an arch expander and a shell-shaped appliance for transverse expansion of the upper jaw, the arch expander comprises an expander and a band ring sleeved on the teeth on both sides of the posterior teeth area, and the band ring and the expander are connected through a connecting part; the shell-shaped appliance comprises a shell-shaped body, the shell-shaped body comprises a plurality of tooth receiving cavities, and the shell-shaped body is provided with a screen barrier used in cooperation with the arch expander, the screen barrier comprises a blocking part protruding towards the distal teeth on the buccal side; wherein, after the arch expander and the shell-shaped appliance are worn, the blocking part blocks the contact between the buccinator and the corresponding teeth, so that the corresponding teeth and the corresponding buccinator have a space for accommodating the change of the dental arch from a first position to a second position. The arch expander and the shell-shaped appliance in the dental treatment system jointly act on the upper jaw of the patient, improve the treatment effect during the expansion of the arch, and ensure that the treatment result is consistent with the treatment plan.

Description

Technical Field

[0001] This invention belongs to the field of orthodontic technology, more specifically to the field of combined fixed and invisible orthodontic treatment, and particularly refers to a dental orthodontic system. Background Technology

[0002] Malocclusion refers to deformities caused by various congenital or acquired factors during childhood and adolescence. Malocclusion affects the growth and development of teeth, dentition, jawbone, and the neuromuscular tissues of the maxillofacial region. The shape and size of the dental crown and dental arch have a significant impact on the diagnosis and treatment of malocclusion. The development of the dental arch shape and size also follows specific patterns; a normal dental arch shape and size is one of the foundations of normal occlusal development. Expanding the dental arch during the primary dentition stage and early permanent dentition stage is currently one of the common clinical methods for treating malocclusion.

[0003] In existing technologies, intraoral orthodontic appliances, including the commonly used maxillary expander, are among the most frequently used intraoral instruments for expanding the maxillary dental arch. Their working principle involves the posterior teeth moving buccally under the corrective force of the expander, simultaneously stimulating alveolar bone growth in the posterior region, thereby achieving arch expansion. However, in some cases, the pressure of the buccinator muscle on the dental arch can affect the expansion effect, preventing the arch from reaching the expected width, resulting in a deviation between the treatment outcome and the anticipated treatment plan.

[0004] This application provides a technical improvement solution to address the above-mentioned problems. Summary of the Invention

[0005] The technical problem solved by this invention is to overcome the defects of the prior art and provide a dental orthodontic system that blocks the pressure exerted by the buccinator muscle on the dental arch during arch expansion, and this dental orthodontic system can simultaneously align the teeth.

[0006] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0007] A dental orthodontic system includes: an arch expander for transverse arch expansion in the maxilla, comprising an expander and a band fitted onto the teeth on both sides of the posterior region, wherein the band and the expander are connected by a connecting part;

[0008] A shell-shaped orthodontic appliance, comprising a shell-shaped body, the shell-shaped body including multiple tooth receiving cavities, the shell-shaped body having a screen for use in conjunction with an arch expansion device, the screen including a blocking portion protruding distally from the buccal side;

[0009] When the arch expander and the shell-shaped orthodontic appliance are worn, the blocking part prevents the buccinator muscle from contacting the corresponding tooth, creating space between the corresponding tooth and the corresponding buccinator muscle to accommodate the change of the dental arch from a first position to a second position. The blocking part protects the developing dentition from abnormal buccinator muscle function, allowing the teeth, dental arch, and jawbone to develop fully in the length, width, and height directions.

[0010] Preferably, the tongue side of the shell-shaped body has an opening corresponding to the position of the connecting part to facilitate the wearing and removal of the shell-shaped orthodontic appliance.

[0011] Preferably, the tooth receiving cavity corresponding to the band has a receiving structure for accommodating the band, the receiving structure at least partially covering the band in a removable manner.

[0012] Preferably, the tooth receiving cavity has a geometry that allows at least a partially received tooth to move from a first position to a second position.

[0013] Preferably, the screen also has a contact portion connected to the blocking portion. When worn, the blocking portion contacts the buccinator muscle, and the force exerted by the buccinator muscle on the blocking portion is at least partially transmitted to the corresponding gum through the contact portion.

[0014] Preferably, the contact portion has a structure that allows for stable contact with the corresponding gingiva during wear.

[0015] Preferably, the shape of the contact portion near the tooth surface substantially matches the shape of the corresponding gingiva.

[0016] Preferably, the blocking portion is formed by protruding from the labial and / or buccal side of at least one of the tooth receiving cavities toward the distal tooth.

[0017] Preferably, the inner surface of the blocking portion does not contact the outer surface of the teeth adjacent to the inner surface of the blocking portion at least partially.

[0018] Preferably, the blocking portion protrudes toward the distal tooth and is disposed at the gingiva on the labial and / or buccal side of the shell-shaped body.

[0019] Preferably, the blocking part and the contact part are an integral structure or separate structures.

[0020] Preferably, when the blocking part and the contact part are an integral structure, the blocking part is a cavitation structure in the direction of distal tooth.

[0021] Preferably, the cross-sectional shape of the blocking part in the direction of the long axis of the tooth is one of an ellipse, a teardrop shape, a polygon, or a combination of the above shapes.

[0022] Preferably, the interior of the blocking portion is provided with a filling material to enhance the strength of the blocking portion.

[0023] Preferably, when the blocking part and the contact part are separate structures, the blocking part can be fixed to the shell-shaped body by any one of the following methods: bonding, riveting, or welding.

[0024] Preferably, when the blocking part and the contact part are separate structures, the materials of the blocking part and the contact part may be the same or different.

[0025] Preferably, when the blocking part and the contact part are made of the same material, the material thickness of the blocking part is greater than the material thickness of the contact part.

[0026] When the materials of the blocking part and the contact part are different, the elastic modulus of the material of the blocking part is greater than that of the material of the contact part.

[0027] Preferably, the blocking part is a solid protrusion.

[0028] Preferably, the maximum height of the blocking portion protruding towards the distal tooth is 3mm to 8mm.

[0029] Preferably, the length of the blocking portion in the dental arch direction is the width of 1-6 teeth.

[0030] Preferably, the length of the blocking portion in the dental arch direction is equal to the width of the entire dental arch.

[0031] Preferably, any one or more of the proximal, distal, mesial, and distal surfaces of the blocking portion are provided with at least one reinforcing member.

[0032] Preferably, the reinforcing member is integrally formed with the blocking part, and the reinforcing member is a cavitation structure with a surface curvature exceeding that of the blocking part.

[0033] Preferably, the reinforcing member and the blocking part are separate structures, and the reinforcing member is fixedly installed on the blocking part.

[0034] Preferably, the reinforcing member is disposed on the blocking portion along the gingival-maxillary direction or the mesiodistal direction.

[0035] Preferably, the bow expander includes a left base, a right base, and a pusher mounted between the left and right bases for lateral movement of the left and right bases.

[0036] Preferably, the connecting part can be fixed to the left base and the right base respectively by any one of the following methods: bonding, riveting, or welding.

[0037] Preferably, the belt loop and the connecting part are either an integral structure or separate structures.

[0038] Preferably, when the belt loop and the connecting part are separate structures, the belt loop can be fixed to the connecting part by any one of the following methods: bonding, riveting, or welding.

[0039] The dental orthodontic system provided by this invention can bring at least one of the following beneficial effects:

[0040] 1. In this invention, the dental orthodontic system uses a shield on the shell-shaped appliance to block some of the pressure exerted by the buccinator muscle on the dental arch. This allows the dental arch to expand effectively under the action of the arch expander, and the width of the dental arch can also increase as expected, improving the orthodontic accuracy and ensuring that the orthodontic effect matches the orthodontic plan.

[0041] 2. The shell-shaped appliance in the dental orthodontic system of the present invention is also provided with multiple tooth receiving cavities to align the teeth. The shell-shaped appliance and the arch expander act on the teeth at the same time, so that the orthodontic treatment is carried out simultaneously, which improves the treatment effect and shortens the treatment cycle.

[0042] 3. In the dental orthodontic system of the present invention, the shield on the shell-shaped appliance is further provided with a contact portion that contacts the gingiva at the corresponding dentition. The force exerted by the lip muscle and / or buccinator muscle on the shield portion is at least partially transmitted to the corresponding gingiva through the contact portion. The contact portion enhances the retention force of the shell-shaped appliance on the gingiva by covering the gingiva, solving the problem that the shell-shaped appliance is prone to falling off the teeth when the patient's teeth are small. Attached Figure Description

[0043] The preferred embodiments will now be described in a clear and easy-to-understand manner, with reference to the accompanying drawings, to further explain the above-mentioned characteristics, technical features, advantages, and implementation methods.

[0044] Figure 1 This is a schematic diagram of the dental orthodontic system in this invention;

[0045] Figure 2 This is a schematic diagram of the shell-shaped orthodontic appliance in the dental orthodontic system of the present invention;

[0046] Figure 3 This is a schematic diagram of the dental orthodontic system in this invention;

[0047] Figure 4 This is a schematic diagram of one embodiment of the shell-shaped orthodontic appliance in the dental orthodontic system of the present invention;

[0048] Figure 5 for Figure 4 A cross-sectional view of the mid-shell orthodontic appliance along the AA direction;

[0049] Figure 6 This is a schematic diagram of another embodiment of the shell-shaped orthodontic appliance in the dental orthodontic system of the present invention;

[0050] Figure 7 This is a schematic diagram of another embodiment of the shell-shaped orthodontic appliance in the dental orthodontic system of the present invention;

[0051] Figure 8 This is a schematic diagram of another embodiment of the shell-shaped orthodontic appliance in the dental orthodontic system of the present invention;

[0052] Figure 9 This is a schematic diagram of another embodiment of the shell-shaped orthodontic appliance in the dental orthodontic system of the present invention;

[0053] Figure 10 This is a schematic diagram of another embodiment of the shell-shaped orthodontic appliance in the dental orthodontic system of the present invention;

[0054] Figure 11 for Figure 10 A magnified schematic diagram of region I in the middle;

[0055] Figure 12 This is a schematic diagram of the arch expander in the dental orthodontic system of the present invention;

[0056] Figure 13 This is a schematic diagram of the arch expander in the dental orthodontic system of the present invention. Detailed Implementation

[0057] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the specific implementation methods of the present invention will be described below with reference to the accompanying drawings. Obviously, the drawings described below are merely some embodiments of the present invention. For those skilled in the art, other drawings and other implementation methods can be obtained based on these drawings without creative effort.

[0058] Please see Figure 1As shown, the present invention provides a dental orthodontic system, which includes an arch expander 400 for transverse arch expansion of the maxilla and a shell-shaped orthodontic appliance worn simultaneously on the maxillary dentition and used in conjunction with the arch expander 400. The arch expander 400 includes an expander 401 and a band fitted on both sides of the teeth in the posterior region. The band and the expander 401 are connected by a connecting part 403. The shell-shaped orthodontic appliance 1 includes a shell-shaped body 100 with multiple tooth receiving cavities. The shell-shaped body 100 is provided with a screen 101 for use with the arch expander 400. The screen 101 includes a blocking part protruding from the buccal side towards the distal teeth and a contact part connected to the blocking part and covering part of the gingiva. When the arch expander 400 and the shell-shaped orthodontic appliance are worn, the blocking part on the screen 101 blocks the contact between the buccal muscle and the corresponding teeth, so that the teeth have sufficient space to move buccally under the action of the arch expander, and the teeth are not subjected to pressure from the buccal muscle during the movement. That is, there is space between the corresponding teeth and the corresponding buccal muscle to accommodate the change of the dental arch from a first position to a second position. It should also be noted that the tooth receiving cavity may have the function of aligning teeth. Specifically, the tooth receiving cavity has a geometric structure that allows at least part of the teeth to be received to move from a first position to a second position. The first position may be the initial position of the teeth in any orthodontic step, and the corresponding second position is the target position of the teeth in that step. Of course, the tooth receiving cavity may also not have the function of aligning teeth.

[0059] See Figures 1 to 3 As shown, the screen 101 is symmetrically arranged on the buccal side of the shell-shaped body 100, and the shell-shaped body 100 has a receiving structure 103 for accommodating the ring in the corresponding tooth receiving cavity. Figure 1(The dotted lines in the accommodating structure 103 represent the shape of a ring). An opening 102 is provided on the lingual side of the shell-shaped body 100 corresponding to the position of the connecting part 403 of the arch expander 400. The accommodating structure 103 and the opening 102 on the lingual side of the shell-shaped body 100 allow the shell-shaped appliance to be repeatedly removed and worn from the dentition with the arch expander 400. Specifically, to obtain the shell-shaped body 100, a digital model of the dentition can be acquired through intraoral scanning, or a negative mold can be taken with silicone rubber, a positive mold prepared from a plaster model, and the positive mold scanned to generate a digital model of the dentition. The dentition model is then digitized, repaired, and incisor processing is performed to form a digital dentition model. Based on the actual situation of the digital dentition model with the incisors completed, a dental treatment plan is generated. During the plan generation process, a ring structure is set on the posterior teeth corresponding to the ring on the digital model of the teeth, and cutting marks for the opening 102 are set at the corresponding connecting part. Next, the digital dental orthodontic model is 3D printed, and then a film is pressed onto the printed dental model using a hot pressing method. The pressed model is then cut along the gingival line and the cutting marks of opening 102. Cutting can be done directly along the gingival line or 1-2 mm above or below the gingival line. The cut shell-shaped body 100 is polished until it is wearable. At this point, in addition to covering the dentition, the shell-shaped body 100 also has a receiving structure 103 that covers part of the ring. The shape of the receiving structure 103 basically matches the shape of the ring set on the teeth in the posterior region. On both sides of the opening 102 corresponding to the connecting part 403 on the shell-shaped body 100, there are anti-dislodgement structures 102a to prevent the shell-shaped body 100 from falling off the dentition wearing the arch expander 400. When the shell-shaped appliance is worn, the connecting part 403 enters the opening 102 on the lingual side of the shell-shaped body 100. The opening 102 and its corresponding tooth receiving cavity undergo partial elastic deformation, allowing the connecting part 403 to pass through the anti-dislodgement structure 102a, and positioning the shell-shaped appliance and the arch expander 400 in the correct wearing position. The opening 102 and its corresponding tooth receiving cavity at least partially recover their deformation, making it difficult for the shell-shaped appliance to fall off the teeth, ensuring that the entire orthodontic plan is carried out as planned.

[0060] Please see Figure 4 and Figure 5As shown, the shell-shaped orthodontic appliance of the present invention includes a shell-shaped body 100 with multiple tooth receiving cavities, which enclose the entire tooth from the crown to the gingival margin. The shell-shaped body 100 has a receiving structure 103 for accommodating a ring on its lingual side and a screen 101 on its buccal or labiobuccal side. The screen 101 includes a contact portion 101b and a blocking portion 101a integrally formed with the shell-shaped body 100. The blocking portion 101a protrudes from the buccal or labiobuccal side of the shell-shaped body 100 towards the distal tooth, spreading the buccal mucosa to block contact between the buccinator muscle or labiobuccal muscle and the corresponding tooth, thereby eliminating the inhibitory effect of the buccinator muscle or labiobuccal muscle on tooth growth and stimulating the lateral or longitudinal development of the corresponding tooth. The contact portion 101b is connected to the blocking portion 101a. When worn, the contact portion 101b contacts the corresponding gingiva 300 where the screen 101 is located, and the contact portion 101b has a structure that provides stable contact with the corresponding gingiva 300. Specifically, the near-gingival surface of the contact portion 101b can be a curved structure, a planar structure, or a structure with protrusions. Preferably, a curved structure that basically matches the shape of the corresponding gingiva 300 is adopted. This structure allows the contact portion 101b to completely fit and cover the corresponding gingiva 300, enhancing the control of the shell-shaped appliance over the corresponding gingiva 300. This solves the problem that the shell-shaped appliance is prone to falling off the teeth when the patient's teeth are small, such as in children's deciduous teeth or early mixed dentition in adolescents. Specifically, when the patient wears the appliance, the blocking part 101a blocks the force exerted by the buccinator or lip-cheek muscles on the teeth that inhibits their growth and development. The blocking part 101a is connected to the contact part 101b, which transmits part of the pressure from the buccinator or lip-cheek muscles to the corresponding gingiva 300 that contacts the contact part 101b. This enhances the control of the shell-shaped appliance over the corresponding gingiva 300 during wear, making it less likely to fall off the teeth.

[0061] In some embodiments, reference Figure 5 and Figure 6 As shown, the shell-shaped body 100 and the screen 101 are integrally formed. The surface of the blocking part 101a adjacent to the buccinator muscle can be set as a smooth curved surface, so that the patient will not have a strong foreign body sensation after wearing it, thus improving the patient's comfort. In this embodiment, the tooth receiving cavity with the blocking part 101a has weak control over the corresponding teeth, and the orthodontic force of the tooth receiving cavity in this area is insufficient. However, in the manufacturing process, especially when using hot-pressing film technology to manufacture shell-shaped orthodontic appliances, the processing difficulty is small and demolding is easier. (Refer to...) Figure 6 As shown in the shell-shaped orthodontic appliance, in order to enhance Figure 5 The tooth receiving cavity or shell-shaped orthodontic appliance in the embodiment has control over the corresponding tooth, and the blocking part 101a can be adjacent to the crown region a of the tooth near the blocking part 101a. Figure 6The area indicated by the arrow in the diagram is contacted, which increases the area of ​​the tooth cavity covering the crown of the corresponding tooth. This increases the control of the tooth cavity or shell-shaped appliance over the corresponding tooth without changing the obstruction of the buccinator muscle by the blocking part 101a.

[0062] In other embodiments, reference is made to... Figure 7 As shown, the blocking portion 101a protrudes distally from the tooth and is located at the gingiva 300 on the buccal side of the shell-shaped body 100, covering part of the surface of the tooth receiving cavity adjacent to the lip muscle and / or buccinator muscle and part of the gingival surface. Compared with a structure where the blocking portion 101a protrudes directly distally from the tooth receiving cavity, this structure is characterized by a larger area of ​​the tooth receiving cavity corresponding to the blocking portion 101a covering the tooth, stronger overall control of the dentition by the shell-shaped appliance, and the setting of the blocking portion 101a does not affect the orthodontic force of the corresponding tooth by the shell-shaped appliance. The blocking portion 101a and the contact portion 101b can be an integral structure or separate structures. When the blocking portion 101a and the contact portion 101b are an integral structure, that is, the screen 101 and the shell-shaped body 100 are integrally formed, the blocking portion 101a is a cavitation structure protruding distally. The cross-sectional shape of the cavitation bubble along the long axis of the tooth is elliptical, teardrop-shaped, polygonal, or a combination of the above shapes. Preferably, it is elliptical, teardrop-shaped, or a combination of both, as its smooth curved surface structure allows the blocking portion 101a to fit more closely with the patient's lip and / or cheek muscles, reducing patient discomfort. It also disperses some of the pressure exerted by the lip and / or cheek muscles, preventing excessive pressure from being transmitted to the corresponding tooth.

[0063] The interior of the blocking part 101a may be provided with a filling material to enhance the strength and / or rigidity of the blocking part 101a, preventing excessive pressure applied by the lip muscle and / or cheek muscle to the blocking part 101a, which would cause the blocking part 101a to deform and lose its function of isolating the lip muscle and / or cheek muscle from the corresponding tooth. The filling material further ensures the strength of the blocking part 101a, allowing the corresponding tooth sufficient space to grow laterally or longitudinally. The filling material may be a glass resin material that meets dental medical standards.

[0064] In other embodiments, reference is made to... Figure 8As shown, when the blocking part 101a and the contact part 101b are separate structures, the contact part 101b and the shell-shaped body 100 are integrally formed. The blocking part 101a can be fixed to the shell-shaped body 100 by any of the following methods: bonding, riveting, or welding. Preferably, an adhesive is used to fix the blocking part 101a to the shell-shaped body 100, which simplifies the manufacturing process and is beneficial for mass production. When the blocking part 101a and the contact part 101b are made of the same material, the rigidity of the blocking part 101a can be increased by increasing its thickness. When the blocking part 101a and the contact part 101b are made of different materials, the blocking part 101a can be made of a material with an elastic modulus greater than that of the contact part 101b to increase its rigidity, such as metal, ceramic, or other polymer materials.

[0065] In other embodiments, reference is made to... Figure 9 As shown, the maximum height L1 of the blocking portion 101a protruding distally is 3mm to 8mm. The thickness of the blocking portion 101a can be set to 2.5mm to 3.0mm. The gap between the inner surface of the blocking portion 101a adjacent to the outer surface of the tooth and the outer surface of the corresponding tooth is set to a minimum of 3.0mm. This is to reduce the inhibitory effect of the buccinator or lip-buccal muscles on tooth growth. The length of the barrier 101 along the dental arch direction is the width of 1-6 teeth or the width of the entire dental arch. The blocking portion 101a located on the labial and buccal sides can eliminate part of the pressure of the lip on the jawbone, while simultaneously pulling on the local alveolar bone periosteum, stimulating alveolar bone deposition on the labial surface. Furthermore, simultaneously setting the blocking portion 101a on both the labial and buccal sides can also pull on the periosteum at the vestibular sulcus, stimulating the growth and development of the corresponding alveolar bone.

[0066] In other embodiments, at least one reinforcing member 101c is provided on any one or more of the mesial, distal, mesial, and distal surfaces of the blocking portion 101a to enhance the rigidity of the blocking portion 101a. Preferably, it is provided on any surface except the distal surface to avoid contact between the reinforcing member 101c and the labial and / or buccinator muscles, thereby improving the comfort of the patient when wearing the shell-shaped orthodontic appliance. The reinforcing member 101c can be positioned along the gingival-maxillary direction or the mesiodistal direction. The reinforcing member 101c can be an integral structure with the blocking portion 101a or a separate structure. When the reinforcing member 101c is an integral structure with the blocking portion 101a, refer to... Figure 10 and Figure 11As shown, the reinforcing member 101c is a cavitation structure with a surface curvature exceeding that of the blocking part 101a. This cavitation structure can protrude outwards or be recessed inwards, increasing the surface area of ​​the blocking part 101a to enhance its strength and prevent deformation under pressure from the lip and / or cheek muscles. The cavitation structure can be multiple protruding or recessed dot structures or one or more protruding or recessed elliptical structures. Additionally, the reinforcing member can be a reinforcing rib adhered to any one or more surfaces of the mesial, distal, mesial, and distal surfaces, which also increases the stiffness of the blocking part 101a; further details are omitted here.

[0067] refer to Figure 12 and Figure 13 As shown, the expander 401 in the expander device 400 can be a commercially available spiral expander commonly used in clinical practice. The expander 401 includes a left base 401a, a right base 401b, and a pusher 401c installed between the left base 401a and the right base 401b for pushing the left base 401a and the right base 401b to move laterally. The left base 401a and the right base 401b are symmetrically arranged. The expansion speed can be fast or slow depending on different orthodontic plans. The connecting part 403 can be fixed to the front and rear ends of the left base 401a and the right base 401b respectively by any of the following methods: bonding, riveting, or welding. The maximum length of the cross-section of the connecting part 403 does not exceed half the length of the corresponding tooth cavity on the long axis of the tooth, so that the corresponding tooth cavity does not lose control over the tooth. The band 104 partially wraps around the corresponding tooth; specifically, the band 104 wraps around the lingual surface of the corresponding tooth. The band 104 and the connecting part can be configured as an integral structure or a separate structure. When the band and the connecting part are separate structures, the band can be fixed to the connecting part by any of the following methods: bonding, riveting, or welding. Welding is the preferred method, as it simplifies the manufacturing process. After removing the arch expander 400, the patient can continue to wear the shell-shaped appliance to block the pressure exerted by the buccinator muscle on the dental arch, thus maintaining the arch expander effect.

[0068] It should be noted that the above embodiments can be freely combined as needed. The above description is only a preferred embodiment of the present invention. It should be pointed out that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A dental treatment system, characterized by, include: An arch expander for maxillary transverse arch expansion includes an arch expander and a band fitted onto the teeth on both sides of the posterior region, wherein the band and the arch expander are connected by a connecting part. A shell-shaped orthodontic appliance, comprising a shell-shaped body, the shell-shaped body including multiple tooth receiving cavities, the lingual side of the shell-shaped body having an opening corresponding to the position of the connecting portion for easy removal and insertion of the shell-shaped orthodontic appliance, the tooth receiving cavity corresponding to the band having a receiving structure for accommodating the band, the receiving structure at least partially covering the band in a removable manner, the shell-shaped body having a screen for use in conjunction with an arch expander, the screen including a blocking portion protruding distally on the buccal side and a contact portion connected to the blocking portion, the contact portion having a structure for stable contact with the corresponding gingiva during wear, during wear, the blocking portion contacting the buccinator muscle, the force exerted by the buccinator muscle on the blocking portion being at least partially transmitted to the corresponding gingiva through the contact portion, the blocking portion being formed by the labial and / or buccal side of at least one of the tooth receiving cavities protruding distally, or the blocking portion protruding distally on the gingiva of the labial and / or buccal side of the shell-shaped body; When the arch expander and the shell-shaped orthodontic appliance are worn, the blocking part prevents the buccinator muscle from contacting the corresponding tooth, so that there is space between the corresponding tooth and the corresponding buccinator muscle to accommodate the change of the dental arch from the first position to the second position.

2. The dental treatment system according to claim 1, wherein The tooth receiving cavity has a geometry that allows at least a portion of the received tooth to move from a first position to a second position.

3. The dental treatment system according to claim 1, wherein The shape of the contact portion near the tooth surface basically matches the shape of the corresponding gingiva.

4. The dental treatment system according to claim 1, wherein When worn, the inner surface of the blocking part does not at least partially contact the outer surface of the teeth adjacent to the inner surface of the blocking part.

5. The dental treatment system according to claim 1, wherein When the blocking part protrudes towards the distal tooth and is disposed at the gingiva on the labial and / or buccal side of the shell-shaped body, the blocking part and the contact part are either an integral structure or separate structures.

6. The dental treatment system according to claim 5, wherein When the blocking part and the contact part are an integral structure, the blocking part is a cavitation structure protruding towards the distal tooth.

7. The dental treatment system according to claim 6, wherein The cross-sectional shape of the blocking part along the long axis of the tooth is one of an ellipse, a teardrop shape, a polygon, or a combination of the above shapes.

8. The dental treatment system according to claim 6, wherein The interior of the blocking part is filled with a material to enhance its strength.

9. The dental treatment system according to claim 5, wherein, When the blocking part and the contact part are separate structures, the blocking part can be fixed to the shell-shaped body by any one of the following methods: bonding, riveting, or welding.

10. The dental treatment system according to claim 5, wherein, When the blocking part and the contact part are separate structures, the materials of the blocking part and the contact part may be the same or different.

11. The dental treatment system according to claim 10, wherein When the blocking part and the contact part are made of the same material, the material thickness of the blocking part is greater than the material thickness of the contact part.

12. The dental treatment system according to claim 10, wherein, When the materials of the blocking part and the contact part are different, the elastic modulus of the material of the blocking part is greater than that of the material of the contact part.

13. The dental treatment system according to claim 9, wherein The blocking part is a solid protrusion.

14. The dental treatment system of claim 1, wherein, The maximum height of the blocking part protruding towards the distal tooth is 3mm to 8mm.

15. The dental orthodontic system according to claim 1, characterized in that, The length of the blocking part in the direction of the dental arch is 1-6 teeth width.

16. The dental orthodontic system according to claim 1, characterized in that, The length of the blocking part in the direction of the dental arch is equal to the width of the entire dental arch.

17. The dental orthodontic system according to claim 1, characterized in that, The blocking part has at least one reinforcing member on any one or more of the proximal tooth surface, distal tooth surface, mesial surface, and distal surface.

18. The dental orthodontic system according to claim 17, characterized in that, The reinforcing member is integrally formed with the blocking part, and the reinforcing member is a cavitation structure with a surface curvature exceeding that of the blocking part.

19. The dental orthodontic system according to claim 17, characterized in that, The reinforcing member and the blocking part are separate structures, and the reinforcing member is fixedly installed on the blocking part.

20. The dental orthodontic system according to any one of claims 17-19, characterized in that, The reinforcing member is disposed on the blocking part along the gingival-maxillary direction or the mesiodistal direction.

21. The dental orthodontic system according to claim 1, characterized in that, The bow expander includes a left base, a right base, and a pusher installed between the left and right bases for pushing the left and right bases to move laterally.

22. The dental orthodontic system according to claim 21, characterized in that, The connecting part can be fixed to the left base and the right base respectively by any one of the following methods: bonding, riveting, or welding.

23. The dental orthodontic system according to claim 1, characterized in that, The belt loop and the connecting part are either an integral structure or separate structures.

24. The dental orthodontic system according to claim 1, characterized in that, When the belt loop and the connecting part are separate structures, the belt loop can be fixed to the connecting part by any one of the following methods: bonding, riveting, or welding.

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