Shell-shaped dental instrument

Abstract

The utility model provides a shell-shaped dental instrument which comprises an appliance body and an accessory, the appliance body forms a cavity for accommodating teeth, the appliance body is provided with a first connecting part, the first connecting part comprises a mounting cavity which convexly extends towards the outer side of the cavity and is communicated with the cavity, and the accessory is arranged in the mounting cavity. A mounting opening is formed in the circumferential surface of the mounting cavity; the accessory is provided with a second connecting part, the second connecting part is configured to be inserted into the first connecting part in the first direction, at least part of the second connecting part is inserted into the mounting cavity from the mounting opening, and the part, inserted into the mounting cavity, of the second connecting part is completely located in the mounting cavity; the first direction is perpendicular to the direction from the cheek side to the tongue side; and a fixing part for fixing the first connecting part and the second connecting part is arranged between the first connecting part and the second connecting part.

Description

Technical Field

[0001] The utility model relates to the technical field of tooth correction, in particular to a shell-shaped dental instrument. Background Art

[0002] Shell-shaped dental appliances made of polymer materials are becoming more and more popular due to their advantages of being beautiful, convenient, and easy to clean. When using shell-shaped dental appliances for orthodontic treatment, a series of shell-shaped dental appliances are usually required, each of which has a cavity for accommodating teeth, and the geometry of the cavity basically matches the tooth layout desired to be achieved in the treatment step.

[0003] Generally, in many cases, it is difficult to ensure that the corrective force of appropriate size and direction is applied to the teeth by simply relying on the shell-shaped dental appliance itself. Therefore, the current shell-shaped dental appliance includes an appliance body that accommodates the teeth and an accessory coupled to the appliance body. However, the current accessories are inconvenient to fix, and during use, there is a risk that the accessories will fall off the appliance body due to the force. Utility Model Content

[0004] The utility model aims to provide a shell-shaped dental instrument, which provides a simple way to fix the attachment and the correction body.

[0005] To achieve the above-mentioned purpose of the utility model, one embodiment of the utility model provides a shell-shaped dental device, including an orthodontic appliance body and an accessory, the orthodontic appliance body forming a cavity for accommodating teeth, the orthodontic appliance body having a first connecting portion, the first connecting portion comprising a mounting cavity protruding toward the outside of the cavity and connected to the cavity, the circumferential surface of the mounting cavity being provided with a mounting port; the accessory having a second connecting portion, the second connecting portion being configured to be plugged into the first connecting portion along a first direction, the second connecting portion at least partially inserted into the mounting cavity from the mounting port and the portion inserted into the mounting cavity being completely located in the mounting cavity, the first direction being perpendicular to the direction pointing from the buccal side to the lingual side; a fixing portion for fixing the first connecting portion and the second connecting portion is provided between the first connecting portion and the second connecting portion.

[0006] As a further improvement of an embodiment of the utility model, the fixing portion is a bonding portion, a welding portion or a snap-fit ​​structure.

[0007] As a further improvement of an embodiment of the utility model, the opening direction of the installation opening is toward the gum side.

[0008] As a further improvement of an embodiment of the utility model, the mounting opening is flush with the opening of the appliance body.

[0009] As a further improvement of an embodiment of the utility model, the attachment is used to apply force in the mesial and / or distal direction.

[0010] As a further improvement of an embodiment of the present invention, the cooperation between the first connecting portion and the second connecting portion limits the attachment from rotating circumferentially relative to the orthodontic device body.

[0011] As a further improvement of an embodiment of the utility model, the geometric profile of the first connecting portion is a polyhedron, and the first connecting portion has an open surface, and the open surface forms the installation opening.

[0012] As a further improvement of an embodiment of the utility model, the portion of the second connecting portion inserted into the installation cavity matches the shape of the installation cavity.

[0013] As a further improvement of an embodiment of the utility model, the first connecting part includes a rear cavity wall close to the buccal side or the lingual side, two opposite side cavity walls and a bottom cavity wall connecting the two side cavity walls, the two side cavity walls and the bottom cavity wall form the circumferential surface, the cavity also has an open end opposite to the bottom cavity wall to form the mounting port, the second connecting part has a mounting groove, the mounting groove includes a rear groove wall close to the lingual side or the buccal side, two opposite side groove walls, a bottom groove wall connecting the two side groove walls and an open side opposite to the bottom groove wall, the bottom groove wall is provided with a connecting tongue protruding into the mounting groove, a gap is left between the connecting tongue and the rear groove wall, the connecting tongue is inserted into the mounting cavity from the mounting port, and the rear cavity wall of the mounting cavity is inserted between the connecting tongue and the rear groove wall from the open side.

[0014] As a further improvement of one embodiment of the utility model, a gap is left between the connecting tongue and the two side groove walls, the two side cavity walls of the installation cavity are at least partially inserted between the connecting tongue and the two side groove walls, and the bottom groove wall closes the installation opening.

[0015] As a further improvement of an embodiment of the utility model, the fixing portion is a glue connection portion, and the second connection portion is provided with a glue groove.

[0016] As a further improvement of an embodiment of the utility model, the rear groove wall, the two side groove walls and the bottom groove wall of the installation groove are provided with the glue groove; the glue groove arranged on the two side groove walls and the rear groove wall is in the shape of a long strip extending along the first direction; the glue groove arranged on the bottom groove wall is connected to the glue groove arranged on the rear groove wall.

[0017] As a further improvement of one embodiment of the utility model, the glue groove is provided on the surface of the connecting tongue opposite to the rear groove wall and the two side groove walls. The glue groove provided on the connecting tongue is in the shape of a long strip extending along the first direction and corresponds to the position of the glue groove provided on the bottom groove wall.

[0018] As a further improvement of an embodiment of the utility model, the accessory includes a tubular accessory, the tubular accessory is used to install archwire accessories, and the extension direction of the tubular installation hole of the tubular accessory is set at an angle to the direction of the installation port.

[0019] As a further improvement of an embodiment of the utility model, the extension direction of the tubular mounting hole of the tubular accessory is 90° with the direction of the mounting opening.

[0020] As a further improvement of an embodiment of the utility model, the accessory includes a first hanging portion, which is used to suspend an elastic force-applying member, and the elastic force-applying member is used to apply a force to the arch wire accessory along the extension direction of the tubular mounting hole and toward the tubular mounting hole to assist in fixing the arch wire accessory in the tubular mounting hole.

[0021] As a further improvement of an embodiment of the utility model, the first hanging portion includes two hanging grooves arranged at both ends of the tubular mounting hole of the tubular accessory.

[0022] As a further improvement of one embodiment of the utility model, the accessory also includes a main body portion forming the tubular mounting hole, and an end portion of the main body portion protrudes out of the connecting portion to form the hanging portion with an outer wall of the connecting portion and an outer wall of the orthodontic device body.

[0023] As a further improvement of an embodiment of the utility model, the arch wire of the arch wire accessory has an insertion end inserted into the tubular mounting hole, the arch wire portion is bent to form a second hanging portion, and the elastic force applying member is respectively and simultaneously suspended on the first hanging portion and the second hanging portion, and the elastic force applying member applies an elastic force to the arch wire accessory toward the tubular accessory.

[0024] As a further improvement of an embodiment of the utility model, the arch wire also includes a limiting portion placed between the insertion end and the second hanging portion, and the limiting portion is formed by bending the arch wire; the second hanging portion and the limiting portion are both bent toward the opening side of the orthodontic device body; the second hanging portion is inclined toward the side away from the tubular attachment.

[0025] As a further improvement of an embodiment of the utility model, the archwire accessories include an extraoral arch, a depression auxiliary arch, an expansion auxiliary arch, a palatal bead trainer, and a lip stopper; the elastic force-applying member includes a rubber band and a ligature ring.

[0026] The shell-shaped dental instrument provided by the utility model has a first connecting portion arranged on the orthodontic appliance body, and a mounting opening is arranged on the circumferential surface of the first connecting portion, so that the accessory can be plugged into the first connecting portion along a first direction perpendicular to the lingual side and pointing to the buccal side, which causes less damage to the orthodontic appliance body, and the overall installation is simple and the connection is stable. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a three-dimensional schematic diagram of the body of the orthodontic appliance according to one embodiment of the utility model;

[0028] Figure 2 for Figure 1 A schematic cross-sectional view of the appliance body shown;

[0029] Figure 3 It is a schematic diagram of an angle of a shell-shaped dental instrument according to an embodiment of the present invention;

[0030] Figure 4 for Figure 3 Another perspective view of the shell-shaped dental device shown;

[0031] Figure 5 for Figure 1 A three-dimensional schematic diagram of the appliance body from another angle is shown;

[0032] Figure 6 for Figure 3 Schematic diagram of explosion of shell-shaped dental instrument shown;

[0033] Figure 7 for Figure 3 A schematic diagram of the attachment of the shell-shaped dental instrument shown;

[0034] Figure 8 for Figure 3 The schematic diagram of the shell-shaped dental appliance shown is when an archwire-like accessory is installed;

[0035] Fig. 9 for Figure 8 The shell-shaped dental instrument shown is a schematic diagram of installing an archwire-like accessory and an elastic force-applying member. DETAILED DESCRIPTION

[0036] The following detailed description refers to the drawings that form a part of this specification. The illustrative embodiments mentioned in the specification and the drawings are for illustrative purposes only and are not intended to limit the scope of protection of the present application. Under the enlightenment of the present application, those skilled in the art will understand that many other embodiments can be adopted, and various changes can be made to the described embodiments without departing from the main purpose and scope of protection of the utility model. It should be understood that the various aspects of the present application described and illustrated herein can be arranged, replaced, combined, separated and designed according to many different configurations, and these different configurations are within the scope of protection of the present application.

[0037] See also Figures 1 to 4 In one embodiment of the present invention, a shell-shaped dental instrument 100 is provided.

[0038] The shell-shaped dental appliance 100 includes an appliance body 10 and an attachment 20. The appliance body 10 forms a cavity S for accommodating teeth, and the attachment 20 is mounted on the appliance body 10 to apply auxiliary correction force to the teeth.

[0039] The appliance body 10 has a first connection portion 11, the first connection portion 11 includes a mounting cavity S1 protruding toward the outside of the cavity S and communicating with the cavity S, and a mounting port 13 is provided on the circumferential surface 12 of the mounting cavity S1. The attachment 20 has a second connection portion 21, the second connection portion 21 is configured to be plugged into the first connection portion 11 along a first direction X, the second connection portion 21 is at least partially inserted into the mounting cavity S1 from the mounting port 13, and the portion inserted into the mounting cavity S1 is completely located in the mounting cavity S1. The first direction X is a direction perpendicular to the buccal side pointing to the lingual side, and the circumferential direction can be a direction around the buccal side pointing to the lingual side.

[0040] A fixing portion for fixing the first connecting portion 11 and the second connecting portion 21 may be provided between the first connecting portion 11 and the second connecting portion 21 .

[0041] In this embodiment, the circumferential surface 12 of the mounting cavity S1 is provided with a mounting opening 13, and the mounting opening 13 can connect the mounting cavity S1 with the external environment. Therefore, when the second connection part 21 is plugged into the first connection part 11 along the first direction X, a portion of the second connection part 21 can enter the interior of the mounting cavity S1 from the mounting opening 13 along the first direction X.

[0042] The installation opening 13 is provided on the circumferential surface 12, which simplifies the manufacturing process and can reduce damage to the appliance body 10. At the same time, the installation direction of the accessory 20 is parallel to the shell of the appliance body 10, which is also convenient for installing the accessory 20, and the connection strength is also good. The part of the second connection part 21 located in the installation cavity S1 is completely placed in the installation cavity S1 without protruding into the cavity S. Therefore, during the correction process, the second connection part 21 will not contact the tooth surface, and the force of the accessory 20 can be directly applied to the appliance body 10 without being applied to the teeth, so that the predetermined correction effect can be achieved.

[0043] Furthermore, in one embodiment of the present invention, the fixing portion may be a bonding portion, a welding portion or a buckle.

[0044] In this embodiment, during the process of installing the accessory 20 to the corrector body 10, the second connecting part 21 can be first plugged into the first connecting part 11 along the first direction X, and then the first connecting part 11 and the second connecting part 21 can be fixed by gluing or welding or a snap-fit ​​structure, so that the accessory 20 is firmly installed to the corrector body 10.

[0045] In one embodiment of the utility model, the opening direction of the mounting opening 13 faces the gum side, and the mounting opening 13 can be flush with the opening of the appliance body 10. In this embodiment, the mounting opening 13 can be directly an open plane, that is, the mounting opening 13 and the opening of the appliance body 10 face the same circumferential surface 12 and are completely open to communicate with the cavity S of the appliance body 10. In this way, it is more convenient to process and manufacture the shell-shaped dental appliance 100, and there is no need to set an additional opening to damage the appliance body 10.

[0046] The attachment 20 can be used to apply force in the mesial and / or distal directions. In this way, the force application direction of the attachment 20 is perpendicular to the opening direction of the installation opening 13, that is, the force application direction of the attachment 20 is perpendicular to the insertion direction, that is, the first direction X, and the attachment 20 is installed more firmly and is not easy to fall off.

[0047] In this embodiment, the geometric profile of the first connecting portion 11 may be a polyhedron, and the first connecting portion 11 may have an open surface, which forms the mounting opening 13. The open surface may be flush with the opening of the appliance body 10, so that the processing and manufacturing of the appliance body 10 is facilitated.

[0048] Further, in one embodiment of the utility model, the cooperation of the first connecting portion 11 and the second connecting portion 21 can limit the circumferential rotation of the attachment 20 relative to the appliance body 10. The geometric shape of the first connecting portion 11 can be a polyhedron. The portion of the second connecting portion 21 inserted into the mounting cavity S1 can match the shape of the mounting cavity S1. The mounting cavity S1 can limit the movement of the second connecting portion 21 in a direction perpendicular to the first direction X and perpendicular to the buccal side pointing to the lingual side.

[0049] The portion of the second connection portion 21 extending into the interior of the installation cavity S1 may be a plate or polyhedron having the same shape as the interior of the installation cavity S1. A circumferential surface 12 of the first connection portion 11 may be opened to form a mounting opening 13. In this way, the cooperation of the first connection portion 11 and the second connection portion 21 can limit the position of the accessory 20 and the appliance body 10, making it easier to glue or weld or use a snap connection, and at the same time can improve the stability of the connection between the accessory 20 and the appliance body, and prevent the accessory 20 from falling off from the appliance body 10 during use.

[0050] See also Figure 5 In this embodiment, the first connecting portion 11 may include a rear cavity wall 14 close to the tongue side or the buccal side, two opposite side cavity walls 15 and a bottom cavity wall 16 connecting the two side cavity walls 15, the two side cavity walls 15 and the bottom cavity wall 16 form a circumferential surface 12, the circumferential surface 12 opposite to the bottom cavity wall 16 is an open surface to form a mounting opening 13, and the surface opposite to the rear cavity wall 14 is also an open surface directly connected to the cavity S for accommodating the teeth.

[0051] In this embodiment, the attachment 20 can be installed on the lingual side of the appliance body 10, or on the buccal side of the appliance body 10. When the attachment 20 is installed on the lingual side of the appliance body 10, the first connection portion 11 can protrude out of the cavity S toward the lingual side to form the installation cavity S1, and the rear cavity wall 14 of the first connection portion 11 is close to the lingual side. Similarly, if the attachment 20 is installed on the buccal side of the appliance body 10, the first connection portion 11 can protrude out of the cavity S toward the buccal side to form the installation cavity S1, and the rear cavity wall 14 of the first connection portion 11 is close to the buccal side.

[0052] See also Figure 6 The second connecting portion 21 may have an installation groove, which may include a rear groove wall 22 close to the tongue side or the cheek side, two opposite side groove walls 23, a bottom groove wall 24 connecting the two side groove walls 23, and an open side opposite to the bottom groove wall 24. The bottom groove wall 24 is provided with a connecting tongue 25 protruding into the installation groove, and a gap is left between the connecting tongue 25 and the rear groove wall 22. The connecting tongue 25 is inserted into the installation cavity S1 from the installation opening 13, and the rear cavity wall 14 of the installation cavity S1 is inserted between the connecting tongue 25 and the rear groove wall 22 from the open side.

[0053] In this embodiment, the connecting tongue 25, i.e., the portion of the second connecting portion 21 inserted into the mounting cavity S1 of the first connecting portion 11, can match the shape of the mounting cavity S1, thereby limiting the movement of the connecting tongue 25 in the mounting cavity S1. The connecting tongue 25 is completely placed in the mounting cavity S1 and will not contact the teeth, thereby not affecting the treatment effect.

[0054] In one embodiment of the utility model, a gap is left between the connecting tongue 25 and the two side groove walls 23, and the two side cavity walls 15 of the installation cavity S1 are at least inserted between the connecting tongue 25 and the two side groove walls 23, and the bottom groove wall 24 of the installation groove can close the installation opening 13 of the installation cavity S1.

[0055] In this way, the first connection part 11 and the second connection part 21 can form a mutual limit, the connection tongue 25 and the installation cavity S1 can form a limit, and the cavity wall of the installation cavity S1 and the installation groove can also form a limit. By plugging the second connection part 21 into the first connection part 11, the accessory 20 can be limited to rotate circumferentially relative to the appliance body 10, and the accessory 20 can be limited to move in the direction from the lingual side to the buccal side relative to the appliance body 10. The accessory 20 can only move in the first direction X relative to the appliance body 10, thereby achieving a more secure connection between the appliance body 10 and the accessory 20. When the fixing part is a bonding part, it is also convenient to glue during the installation process.

[0056] Further, in one embodiment of the present invention, the fixing portion is a bonding portion, see Figure 6 , Figure 7 , the second connecting portion 21 is provided with a glue groove 26 to facilitate the flow and fixation of glue during the installation process. In this embodiment, the rear groove wall 22, the two side groove walls 23 and the bottom groove wall 24 of the installation groove can be provided with a glue groove 26. The glue groove 26 provided on the two side groove walls 23 and the rear groove wall 22 can be in the shape of a long strip extending along the first direction X. The glue groove 26 provided on the bottom groove wall 24 can be connected to the glue groove 26 of the rear groove wall 22, so as to facilitate the opening of the glue groove 26 during the manufacturing process.

[0057] The connecting tongue 25 is also provided with a glue groove 26. Specifically, the surface of the connecting tongue 25 opposite to the rear groove wall 22 and the surface of the connecting tongue 25 opposite to the side groove wall 23 are both provided with a glue groove 26. The glue groove 26 provided on the connecting tongue 25 can be in the shape of a long strip extending along the first direction X, and can correspond to the position of the glue groove 26 provided on the bottom groove wall 24.

[0058] During the installation process, the second connection part can be first plugged into the first connection part, and then glue is injected to form the fixed part. Alternatively, glue can be directly applied to the second connection part and then plugged into the first connection part, and the fixed part is formed after the glue solidifies.

[0059] Glue grooves 26 are provided in multiple areas of the second connection portion 21, and a stable glue connection can be formed between the second connection portion 21 and the inner and outer walls of the installation cavity S1. The glue groove 26 provided on the connection tongue 25 and the glue groove 26 on the groove wall of the corresponding installation groove and the glue groove 26 on the bottom groove wall 24 at the corresponding position form a U shape, which is convenient for glue flow, thereby achieving a better fixing effect.

[0060] For further information, see Figure 3 , Figure 8 as well as Fig. 9 In one embodiment of the utility model, the accessory 20 includes a tubular accessory 20, and the tubular accessory 20 is used to install an archwire accessory 30, and the extension direction of the tubular mounting hole 7 of the tubular accessory 20 is set at an angle to the direction of the mounting port 13. It can be understood that the extension direction of the tubular mounting hole 7 of the tubular accessory 20 is set at an angle to the first direction X. In a specific embodiment, the extension direction of the tubular mounting hole 7 of the tubular accessory 20 is set at 90° to the direction of the mounting port 13, that is, the extension direction of the tubular mounting hole 7 can be perpendicular to the first direction X. In this way, the tubular accessory 20 can be further prevented from falling off from the appliance body 10 during use.

[0061] In one embodiment of the present invention, the archwire accessories 30 may include an extraoral arch, a compression auxiliary arch, an expansion auxiliary arch, a palate bead trainer, and a lip stopper. The archwire accessories 30 may include an archwire, one end of which may form an insertion end 31, and the insertion end 31 of the archwire of the archwire accessories 30 may be inserted into the tubular mounting hole 7.

[0062] The accessory 20 further includes a first hanging portion 29, which is used to hang an elastic force-applying member 40, and the elastic force-applying member 40 is used to apply a force along the extension direction of the tubular mounting hole 7 and toward the tubular attachment 20 to the archwire attachment 30 to assist the archwire attachment 30 to be fixed in the tubular mounting hole 7. In a specific embodiment, the elastic force-applying member 40 may be a rubber band or a ligature. The direction of the elastic force of the elastic force-applying member 40 may be completely the same as the extension direction of the tubular mounting hole 7, or the direction of a part of the elastic force component may be the same as the extension direction of the tubular mounting hole 7. The elastic force of the elastic force-applying member 40 may assist the archwire attachment 30 to be fixed to the tubular attachment 20, and prevent the archwire attachment 30 from falling off from the tubular attachment 20.

[0063] In this embodiment, the first hanging portion 29 may include two hanging grooves disposed at both ends of the tubular mounting hole 7 of the tubular accessory 20. In this way, when the archwire accessory 30 is inserted and installed from either end of the tubular mounting hole 7, the elastic force applying member 40 may be hung for auxiliary fixation.

[0064] In a specific embodiment, the accessory 20 may include a main body portion 28 that forms a tubular mounting hole 7, and the end of the main body portion 28 may protrude from the connecting portion, forming a gap between the end of the main body portion 28 and the outer wall of the appliance body 10, and the end of the main body portion 28, the outer wall of the appliance body 10, and the outer wall of the connecting portion may jointly form a suspension groove.

[0065] Furthermore, in one embodiment of the present invention, the end of the archwire of the archwire accessory 30 is inserted into the tubular mounting hole 7, the archwire portion is bent to form a second hanging portion 32, and the elastic force applying member 40 is respectively and simultaneously suspended on the first hanging portion 29 and the second hanging portion 32, and applies an elastic force toward the tubular accessory 20 to the archwire accessory 20.

[0066] The archwire further includes a limiting portion 33 disposed between the insertion end 31 and the second hanging portion 32, and the limiting portion 33 is formed by bending the archwire. Both the second hanging portion 32 and the limiting portion 33 are bent toward the opening side of the appliance body 10. In this embodiment, the second hanging portion 32 is also inclined toward the side away from the tubular attachment 20, so that the hanging groove forming an acute angle with the archwire can prevent the elastic force applying member 40 from falling off.

[0067] In summary, the shell-shaped dental device 100 provided by the present invention has an accessory 20 that is firmly connected through the cooperation of the first connecting portion 11 and the second connecting portion 21 and the fixing portion. The first connecting portion 11 is formed by protruding directly from the appliance body 10 and having an opening in the circumferential direction, which is simple in manufacturing process and convenient for installing and fixing the accessory 20.

[0068] It should be understood that although this specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each implementation mode may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

[0069] The series of detailed descriptions listed above are only specific descriptions of feasible implementation methods of the utility model. They are not intended to limit the protection scope of the utility model. Any equivalent implementation methods or changes that do not deviate from the technical spirit of the utility model should be included in the protection scope of the utility model.

Claims

1. A shell-shaped dental instrument, characterized in that: It includes an orthodontic appliance body and an accessory, the orthodontic appliance body forms a cavity for accommodating teeth, the orthodontic appliance body has a first connecting portion, the first connecting portion includes a mounting cavity protruding toward the outside of the cavity and connected to the cavity, and the circumferential surface of the mounting cavity is provided with a mounting port; the accessory has a second connecting portion, the second connecting portion is configured to be plugged into the first connecting portion along a first direction, the second connecting portion is at least partially inserted into the mounting cavity from the mounting port and the portion inserted into the mounting cavity is completely located in the mounting cavity, the first direction is perpendicular to the direction pointing from the buccal side to the lingual side; a fixing portion for fixing the first connecting portion and the second connecting portion is provided between the first connecting portion and the second connecting portion.

2. The shell-shaped dental device according to claim 1, characterized in that: The fixing portion is a bonding portion, a welding portion or a snap-fit ​​structure.

3. The shell-shaped dental device according to claim 1, characterized in that: The opening direction of the installation opening is toward the gum side.

4. The shell-shaped dental device according to claim 3, characterized in that: The mounting opening is flush with the opening of the appliance body.

5. The shell-shaped dental device according to claim 3, characterized in that: The attachment is used to apply force in the mesial and / or distal direction.

6. The shell-shaped dental device according to claim 2, characterized in that: The cooperation between the first connecting portion and the second connecting portion limits the attachment from rotating circumferentially relative to the orthodontic appliance body.

7. The shell-shaped dental device according to claim 6, characterized in that: The geometrical outline of the first connection part is a polyhedron. The first connection part has an open surface, and the open surface forms the installation opening.

8. The shell-shaped dental device according to claim 7, characterized in that: The portion of the second connecting portion inserted into the installation cavity matches the shape of the installation cavity.

9. The shell-shaped dental device according to claim 7, characterized in that: The first connecting portion includes a rear cavity wall close to the buccal side or the lingual side, two opposite side cavity walls and a bottom cavity wall connecting the two side cavity walls, the two side cavity walls and the bottom cavity wall form the circumferential surface, the cavity also has an open end opposite to the bottom cavity wall to form the mounting port, the second connecting portion has a mounting groove, the mounting groove includes a rear groove wall close to the lingual side or the buccal side, two opposite side groove walls, a bottom groove wall connecting the two side groove walls and an open side opposite to the bottom groove wall, the bottom groove wall is provided with a connecting tongue protruding into the mounting groove, a gap is left between the connecting tongue and the rear groove wall, the connecting tongue is inserted into the mounting cavity from the mounting port, and the rear cavity wall of the mounting cavity is inserted between the connecting tongue and the rear groove wall from the open side.

10. The shell-shaped dental device according to claim 9, characterized in that: A gap is left between the connecting tongue and the two side groove walls, the two side cavity walls of the installation cavity are at least partially inserted between the connecting tongue and the two side groove walls, and the bottom groove wall closes the installation opening.

11. The shell-shaped dental device according to claim 10, characterized in that: The fixing portion is a glue connection portion, and the second connection portion is provided with a glue groove.

12. The shell-shaped dental device according to claim 11, characterized in that: The rear groove wall, the two side groove walls and the bottom groove wall of the installation groove are provided with the glue groove; the glue grooves provided on the two side groove walls and the rear groove wall are in the shape of long strips extending along the first direction; the glue grooves provided on the bottom groove wall are connected with the glue grooves provided on the rear groove wall.

13. The shell-shaped dental device according to claim 12, characterized in that: The glue groove is arranged on the surface of the connecting tongue opposite to the rear groove wall and the two side groove walls. The glue groove arranged on the connecting tongue is in the shape of a long strip extending along the first direction and corresponds to the position of the glue groove arranged on the bottom groove wall.

14. The shell-shaped dental device according to claim 1, characterized in that: The accessories include tubular accessories, which are used to install archwire accessories. The extension direction of the tubular installation hole of the tubular accessory is set at an angle to the direction of the installation port.

15. The shell-shaped dental device according to claim 14, characterized in that: The extension direction of the tubular mounting hole of the tubular accessory is 90° to the direction of the mounting opening.

16. The shell-shaped dental device according to claim 14, characterized in that: The accessory includes a first hanging portion, which is used to hang an elastic force-applying member, and the elastic force-applying member is used to apply a force to the archwire accessory along the extension direction of the tubular mounting hole and toward the tubular attachment to assist in fixing the archwire accessory in the tubular mounting hole.

17. The shell-shaped dental device according to claim 16, characterized in that: The first hanging portion includes two hanging grooves arranged at two ends of the tubular mounting hole of the tubular attachment.

18. The shell-shaped dental device according to claim 17, characterized in that: The accessory also includes a main body portion forming the tubular mounting hole, and an end portion of the main body portion protrudes out of the connecting portion to form the hanging portion with an outer wall of the connecting portion and an outer wall of the orthodontic device body.

19. The shell-shaped dental device according to claim 17, characterized in that: The archwire of the archwire accessory has an insertion end inserted into the tubular mounting hole, the archwire portion is bent to form a second hanging portion, the elastic force applying member is respectively and simultaneously suspended on the first hanging portion and the second hanging portion, and the elastic force applying member applies an elastic force to the archwire accessory toward the tubular accessory.

20. The shell-shaped dental device according to claim 19, characterized in that The arch wire also includes a limiting portion placed between the insertion end and the second hanging portion; the limiting portion is formed by bending the arch wire; the second hanging portion and the limiting portion are both bent toward the opening side of the orthodontic device body; the second hanging portion is inclined toward a side away from the tubular attachment.

21. The shell-shaped dental device according to claim 16, characterized in that: The archwire accessories include an extraoral arch, a depression auxiliary arch, an expansion auxiliary arch, a palatal bead trainer, and a lip stopper; the elastic force-applying member includes a rubber band and a ligature ring.

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