Long-arm accessory and shell-shaped tooth appliance

Abstract

The embodiment of the utility model relates to the technical field of orthodontics, and discloses a long-arm accessory and a shell-shaped orthodontic appliance. The long arm accessory comprises a bonding part and an extension part which are connected, the bonding part comprises a bonding surface and a first contact surface which are oppositely arranged, the extension part comprises a non-bonding surface and a second contact surface which are oppositely arranged, when the bonding surface is bonded on teeth, the non-bonding surface faces gingiva and is arranged at a distance from the corresponding gingiva, and the second contact surface is arranged at a distance from the non-bonding surface. And the first contact surface and the second contact surface face the inner surface of the shell-shaped tooth appliance. According to the long-arm accessory and the shell-shaped tooth appliance provided by the embodiment of the invention, the aim of moving teeth can be well fulfilled.

Description

Technical Field

[0001] The embodiments of the present application relate to the technical field of dental correction, and in particular to a long arm attachment and a shell-shaped dental appliance. Background Art

[0002] With the continuous development of orthodontic technology, the forms of dental orthodontic devices have become more diverse. In the face of the orthodontic needs of different groups of people, doctors have more and more correction options to choose from. In the process of orthodontic treatment, an important factor people consider is aesthetics. Shell-shaped dental braces are precisely what meet the invisible correction needs of orthodontic patients. Shell-shaped dental braces wrap around the teeth during wearing, and guide tooth movement through the difference between the current dentition morphology.

[0003] In the process of correction using shell-shaped dental appliances, in order to better achieve the correction purpose, accessories are usually selected for auxiliary cooperation. The use of accessories can produce a better mechanical interaction with the shell-shaped dental appliance, providing convenience for the force application of the shell-shaped dental appliance. However, during the use of accessories, the accessories are currently only covered on the surface of the teeth, and the auxiliary effect they can provide is limited. In particular, when using accessories to achieve the overall movement of the teeth, the torque applied by the existing accessories in cooperation with the shell-shaped appliance is limited, resulting in the inability to achieve the purpose of tooth movement. Utility Model Content

[0004] The purpose of the embodiments of the present application is to provide a long-arm attachment and a shell-shaped dental appliance that can better achieve the purpose of tooth movement.

[0005] In order to solve the above technical problems, the embodiments of the present application provide a long arm attachment. The long arm attachment includes a bonding portion and an extension portion connected to each other, and the bonding portion includes a bonding surface and a first contact surface that are relatively arranged. The extension portion includes a non-bonding surface and a second contact surface that are relatively arranged. When the bonding surface is bonded to the teeth, the non-bonding surface faces the gums and is set at a distance from the corresponding gums, and the first contact surface and the second contact surface face the inner surface of the shell-shaped dental appliance.

[0006] The embodiment of the present application also provides a shell-shaped dental appliance. The shell-shaped dental appliance includes a main shell and an extension shell extending from the edge of the main shell. The main shell has a first cavity for accommodating a plurality of teeth, and at least one second cavity for accommodating a part of an accessory. The extension shell is used to cover another part of the accessory, and the accessory is the long arm accessory mentioned above.

[0007] The long-arm attachment and the shell-shaped tooth aligner provided by the embodiments of the present application, compared with the conventional attachments adhesively bonded to teeth, have a portion corresponding to the gingiva through the extension portion, thereby increasing the effective length of the direct cooperation between the attachment and the shell-shaped tooth aligner. The length of the attachment affects the magnitude of the moment generated by the shell-shaped tooth aligner through the attachment. Increasing the length of the attachment is beneficial to increasing the length of the force arm on the attachment, thereby increasing the magnitude of the moment that the attachment can generate, and better achieving the purpose of tooth movement. Moreover, through the extension portion, the orthodontic force in the area corresponding to the tooth root of the shell-shaped tooth aligner can be increased, so that the action point of the orthodontic force is closer to the impedance center of the tooth, thereby making the tooth movement effect better and the movement efficiency higher.

[0008] In some embodiments, the distance in the length direction of the long-arm attachment between the edge of the bonding portion near the gingival margin and the edge of the extension portion away from the gingival margin is 8 to 10 millimeters. In this way, by maximizing the extended length of the long-arm attachment that is not adhesively bonded to the tooth portion, the length of the long-arm attachment can be effectively increased, and the magnitude of the moment generated on the long-arm attachment can be increased, which is beneficial to tooth movement.

[0009] In some embodiments, a preset distance is provided in the sagittal direction between the non-bonding surface and the bonding surface to form a relief area for avoiding the gingiva; when the bonding surface is adhesively bonded to the tooth, the distance between the non-bonding surface and the corresponding gingiva is greater than or equal to 1 millimeter. In this way, by forming a relief area for avoiding the gingiva in the extension portion, direct contact with the gingiva can be avoided, thereby preventing damage to the soft tissue.

[0010] In some embodiments, the distance between the edge of the bonding surface near the gingival margin and the gingival line at the corresponding position is 1 to 1.5 millimeters. In this way, by reserving a certain distance between the edge of the bonding surface and the gingival line, it is beneficial to the smooth progress of the bonding process of the bonding surface.

[0011] In some embodiments, at least a part of the first contact surface and / or at least a part of the second contact surface are set as a curved surface or an inclined surface. In this way, the seating of the shell-shaped tooth aligner can be guided by the curved shape of the curved surface or the inclined shape of the inclined surface.

[0012] In some embodiments, the projections of the bonding portion and the extension portion in the thickness direction are both rectangles. In this way, a rectangular attachment can be formed through the rectangular profile, and the couple or moment generated by the rectangular attachment is beneficial to achieving the overall movement of the tooth.

[0013] In some embodiments, the width of the bonding portion and the extension portion in the mesiodistal direction is 1 to 2 millimeters. In this way, by making the long-arm attachment have a certain width, the overall tooth movement effect can be ensured.

[0014] In some embodiments, the projection of the bonding portion in the thickness direction is trapezoidal, and the width of the bonding portion gradually increases in the gingivolingual direction; and / or, the projection of the extension portion in the thickness direction is trapezoidal, and the width of the extension portion gradually increases in the gingivolingual direction. In this way, by making at least part of the long-arm attachment form a trapezoid with a narrow bottom and a wide top, it is convenient to remove and wear the shell-shaped tooth appliance.

[0015] In some embodiments, the thickness of the bonding portion is 0.5 to 1.2 millimeters, and the thickness of the extension portion is greater than or equal to 3 millimeters. The thickness range of the bonding portion can ensure the wrapping of the crown part of the shell-shaped tooth appliance. The thickness of the extension portion being greater than or equal to 3 millimeters can increase the contact area between the long-arm attachment and the shell-shaped tooth appliance at the corresponding gingiva, thereby increasing the magnitude of the force or moment generated on the long-arm attachment.

[0016] In some embodiments, the bonding portion and / or the extension portion includes a support body arranged in the gingivolingual direction and a molding material that wraps the support body, and the mechanical strength of the support body is greater than that of the molding material. In this way, by providing a support body with higher strength, the stiffness during the use of the long-arm attachment can be improved, and the phenomenon of the long-arm attachment breaking can be avoided.

[0017] In some embodiments, a through-hole structure for threading an arch wire is further provided on the mesiodistal sides of the extension portion. The through-hole structure penetrates the mesiodistal sides of the extension portion.

[0018] In some embodiments, the edge of the outer extension housing is flush with the edge of the extension portion of the long-arm attachment away from the gingival margin. In this way, by not wrapping the end surface of the long-arm attachment in the area where the gingiva is located by the outer extension housing, the phenomenon of the long-arm attachment breaking due to the dislocation of the shell-shaped tooth appliance can be avoided.

[0019] In some embodiments, the shell-shaped tooth appliance further includes an arch wire, and a through-hole structure for threading the arch wire is provided on the mesiodistal sides of the extension portion. When worn, the arch wire passes through the through-hole structure so that the long-arm attachment moves along the guiding direction of the arch wire. In this case, the shell-shaped tooth appliance does not wrap the part of the extension portion corresponding to the through-hole structure, and the through-hole structure is used for threading the arch wire, so as to realize that the long-arm attachment can move along the guiding direction of the arch wire, achieving a better effect of assisting tooth movement and root control. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] One or more embodiments are exemplarily illustrated by the pictures in the corresponding drawings. These exemplary illustrations do not limit the embodiments. Elements with the same reference numerals in the drawings are represented as similar elements, unless otherwise stated, the drawings in the figures do not constitute a proportional limitation.

[0021] Figure 1 is a schematic three-dimensional structure diagram of the long-arm attachment provided by some embodiments of the present application;

[0022] Figure 2 is a front view structural schematic diagram of a long arm attachment provided by some embodiments of the present application;

[0023] Figure 3 is a side view structural schematic diagram of a long arm attachment provided by some embodiments of the present application;

[0024] Figure 4 is a top view structural schematic diagram of a long arm attachment provided by some embodiments of the present application;

[0025] Figure 5 is a three - dimensional structural schematic diagram of a long arm attachment fixed on teeth provided by some embodiments of the present application;

[0026] Figure 6 is a cross - sectional structural schematic diagram of a long arm attachment fixed on teeth provided by some embodiments of the present application;

[0027] Figure 7 is a structural schematic diagram of a long arm attachment fixed on adjacent teeth located in an edentulous space provided by some embodiments of the present application;

[0028] Figure 8 is a simulation model diagram of closing a space using a long arm attachment and a shell - shaped tooth orthodontic appliance provided by some embodiments of the present application;

[0029] Figure 9 is a schematic diagram of tooth displacement simulation of closing a space using a long arm attachment and a shell - shaped tooth orthodontic appliance provided by some embodiments of the present application;

[0030] Figure 10 is a side view structural schematic diagram of a long arm attachment provided by some other embodiments of the present application;

[0031] Figure 11 is a side view structural schematic diagram of a long arm attachment provided by some other embodiments of the present application. Detailed implementation manners

[0032] To make the objectives, technical solutions, and advantages of the embodiments of the present application clearer, the following will elaborate on each implementation manner of the present application in conjunction with the accompanying drawings. However, those of ordinary skill in the art can understand that in each implementation manner of the present application, many technical details are presented for the reader to better understand the present application. However, even without these technical details and various changes and modifications based on the following implementation manners, the technical solutions required to be protected by the present application can still be achieved. The division of the following various embodiments is for convenience of description and should not constitute any limitation on the specific implementation manner of the present application. Various embodiments can be combined and cross - referenced with each other on the premise of not being contradictory.

[0033] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the technical field to which this application belongs; the terms used herein are for the purpose of describing specific embodiments only and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the specification and claims of this application and the above drawings are intended to cover non-exclusive inclusion.

[0034] In the description of the embodiments of this application, unless otherwise clearly specified and limited, technical terms such as "installed", "connected", and "coupled" shall be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can also be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of this application can be understood according to specific circumstances.

[0035] Due to its good aesthetics and convenience in wearing and removing, shell-shaped tooth aligners are increasingly accepted and used by a large number of people undergoing tooth correction. Shell-shaped tooth aligners are made of transparent polymer materials and are finally formed into a shell-shaped structure that can wrap around the teeth. During the wearing process, shell-shaped tooth aligners can exert a force on the teeth that need to be moved, thereby guiding the corresponding teeth to move. For example, shell-shaped tooth aligners can correct the closure of extraction spaces for patients who have had teeth extracted, and can also perform translational, intrusive, rotational, or extrusive movement corrections on patients with tooth malocclusions.

[0036] In the process of using shell-shaped tooth aligners for tooth correction, it is usually necessary to design corresponding correction plans in combination with attachments. The attachments can interact with the voids on the shell-shaped tooth aligner that wrap the attachments, achieving the effects of assisting in correction and increasing the retention force between the shell-shaped tooth aligner and the teeth. The attachments can facilitate the application of force by the shell-shaped tooth aligner to the teeth. The orthodontic force generated when the shell-shaped tooth aligner is worn can act on the attachments, thereby guiding the teeth to perform specific movements. In the prior art, when using attachments for auxiliary correction, since the auxiliary effect provided by the attachments is limited, the torque exerted by the shell-shaped tooth aligner on the teeth is also relatively limited, and it is impossible to better achieve specific tooth movements.

[0037] For example, when using a shell-shaped tooth aligner to correct the closure of the edentulous space for a patient who has had a tooth extracted, a vertical rectangular attachment or an optimized attachment can be designed to provide a couple moment to assist in achieving overall tooth movement and closing the edentulous space. However, because the length of the attachment is short, the conventional attachment is about 4 mm (millimeters) and is only provided on the tooth surface, so the torque exerted by the final shell-shaped tooth aligner on the teeth is limited and cannot truly assist in achieving overall tooth movement.

[0038] To this end, some embodiments of the present application provide a long-arm attachment and a corresponding shell-shaped dental appliance. By increasing the length of the attachment, the attachment is extended to the area where the gums are located. Accordingly, the wrapping area of ​​the attachment is increased in the shell-shaped dental appliance. In this way, the gingival-jaw contact length between the shell-shaped dental appliance and the attachment is increased, the length of the force arm that generates interaction on the attachment is increased, and the torque generated on the attachment is increased. This better achieves the purpose of moving the teeth.

[0039] Combine the following Figures 1 to 7 The long arm attachment provided in some embodiments of the present application is described.

[0040] like Figures 1 to 5 As shown, the long arm attachment 11 provided in some embodiments of the present application includes a connected bonding portion 111 and an extension portion 112, the bonding portion 111 includes a bonding surface 101 and a first contact surface 102 arranged opposite to each other, the extension portion 112 includes a non-bonding surface 103 and a second contact surface 104 arranged opposite to each other, when the bonding surface 101 is bonded to the tooth 20, the non-bonding surface 103 faces the gums 30 and is arranged at a distance from the corresponding gums 30, and the first contact surface 102 and the second contact surface 104 face the inner surface of the shell-shaped dental appliance.

[0041] The bonding portion 111 is the portion where the long arm attachment 11 is fixed to the tooth 20. The long arm attachment 11 can be fixed to the tooth 20 that needs to be moved through the bonding portion 111, for example, it can be fixed to the adjacent tooth located in the extraction area, or to the tooth 20 that needs to be moved in a specific manner such as translation or rotation. The bonding surface 101 of the bonding portion 111 is similar in shape to the surface of the tooth 20, and can be bonded and fixed to the surface of the tooth 20 by light curing. The first contact surface 102 is the surface that contacts the shell-shaped dental appliance after the orthodontic patient wears the shell-shaped dental appliance.

[0042] The extension part 112 is the part of the long arm attachment 11 that extends toward the area where the gums 30 are located. The extension part 112 can effectively increase the length of the attachment. The extension part 112 can use resin materials of different colors from the bonding part 111, that is, the long arm attachment 11 can use white resin materials close to the color of the teeth 20 on the crown side, and red resin materials close to the color of the gums 30 on the gingival root side to avoid affecting the aesthetics of the gums 30. The non-bonding surface 103 of the extension part 112 faces the gums 30 and is spaced from the gums 30 to avoid discomfort to the gums 30 due to direct contact with the gums 30.

[0043] For the long-arm attachment 11 provided in some embodiments of the present application, compared with the conventional attachment adhesively bonded to the tooth 20, the attachment further has a portion corresponding to the gingiva 30 through the extension portion 112. In this way, the effective length of the direct cooperation between the attachment and the shell-shaped tooth appliance is increased, and the length of the attachment affects the magnitude of the moment generated by the shell-shaped tooth appliance through the attachment. Increasing the length of the attachment is beneficial to increasing the length of the force arm on the attachment, thereby increasing the magnitude of the moment that the attachment can generate, and preferably achieving the purpose of moving the tooth 20. Moreover, through the extension portion 112, the orthodontic force corresponding to the root region of the tooth 20 of the shell-shaped tooth appliance can be increased, so that the acting point of the orthodontic force is closer to the resistance center of the tooth 20, thereby making the movement effect of the tooth 20 better and the movement efficiency higher.

[0044] In actual situations, the length of the extension portion 112 of the long-arm attachment 11 corresponding to the gingiva 30 can be designed according to the depth and tolerance of the gingiva 30 of the orthodontic patient. When the depth of the gingiva 30 of the orthodontic patient is large and the tolerance is high, a longer attachment can be designed. By increasing the length of the portion of the attachment that is not adhesively bonded to the tooth 20, a longer force arm of the attachment is obtained, thereby achieving a better tooth 20 movement effect.

[0045] In some embodiments, the distance A in the length direction of the long-arm attachment 11 between the edge of the bonding portion 111 close to the gingival margin and the edge of the extension portion 112 away from the gingival margin can be 8 to 10 millimeters.

[0046] That is to say, the length of the portion of the long-arm attachment 11 that is not adhesively bonded to the tooth 20 can reach 8 to 10 millimeters. Compared with a conventional attachment of about 4 millimeters, the overall length of the long-arm attachment 11 can be increased by more than double. Moreover, the extension portion 112 can cover the corresponding gingiva 30 region, thereby effectively increasing the force arm of the long-arm attachment 11 and increasing the magnitude of the moment generated on the long-arm attachment 11. In actual situations, the distance A between the edge of the bonding portion 111 close to the gingival margin and the edge of the extension portion 112 away from the gingival margin can be 8 millimeters, 8.5 millimeters, 9 millimeters, 9.5 millimeters, or 10 millimeters. The above distance values can make the surface of the extension portion 112 cooperating with the shell-shaped tooth appliance near the resistance center of the tooth 20, thereby making the force applied to the tooth 20 more accurate and improving the orthodontic effect.

[0047] It should be noted that in the biomechanical basis of the movement of tooth 20, the movement mode of tooth 20 is related to the forces and moments applied to tooth 20. The relationship between the center of resistance and the center of rotation of tooth 20 determines whether the movement of tooth 20 is translational or rotational. When the line of action of the orthodontic force passes through the center of resistance, tooth 20 undergoes translation, and at this time, the center of rotation is located at infinity. The position of the center of rotation depends on the ratio of the moment to the force. Therefore, by adjusting this ratio, the movement mode of tooth 20 can be adjusted. The magnitude of the moment on the attachment is related to the magnitude of the force and the length of the attachment. By increasing the length of the attachment to form a long-arm attachment 11 and extending the attachment to the area where the gingiva 30 is located, the force application position of tooth 20 can be made closer to the center of resistance position of tooth 20, thereby being more conducive to the movement of tooth 20.

[0048] In some embodiments, a preset distance may be provided in the sagittal direction between the non-bonding surface 103 and the bonding surface 101 to form a relief area for avoiding the gingiva 30. When the bonding surface 101 is bonded to the tooth 20, the distance B between the non-bonding surface 103 and the corresponding gingiva 30 is greater than or equal to 1 millimeter.

[0049] There is a certain distance between the bonding surface 101 of the extension portion 112 and the bonding surface 101 of the bonding portion 111, so that the extension portion 112 of the long-arm attachment 11 corresponding to the gingiva 30 can be in a non-contact state with the gingiva 30. Furthermore, the discomfort of orthodontic patients during tooth 20 correction using the long-arm attachment 11 can be reduced. During the manufacturing process of the long-arm attachment 11, the portion of the extension portion 112 facing the gingiva 30 can be cut off, and the cutting depth in the sagittal direction can be more than 1 millimeter. In actual situations, the cutting depth in the sagittal direction of the portion of the extension portion 112 facing the gingiva 30 can also be less than 1 millimeter, as long as it is ensured that the non-bonding surface 103 of the extension portion 112 does not contact the gingiva 30 of the orthodontic patient when the long-arm attachment 11 is bonded.

[0050] In some embodiments, referring to Figure 6 As shown, the distance C between the edge of the bonding surface 101 near the gingival margin and the gingival line 31 at the corresponding position can be 1 to 1.5 millimeters.

[0051] That is, the edge of the bonding surface 101 at the bottom of the tooth 20 is kept at a certain distance from the gingival line 31 at the corresponding position, so that the bonding surface 101 is at a position 1 to 1.5 millimeters above the gingival line 31 at the corresponding position. Thus, it is ensured that the portion of the long-arm attachment 11 bonded to the tooth 20 does not affect the gingiva 30, avoiding discomfort to the gingiva 30 of orthodontic patients, and also ensuring the bonding and fixing effect of the long-arm attachment 11.

[0052] In some embodiments, at least a portion of the first contact surface 102 and / or at least a portion of the second contact surface 104 can be configured as a curved surface or an inclined surface.

[0053] The first contact surface 102 and the second contact surface 104 are the surfaces of the long-arm attachment 11 facing the shell-shaped tooth appliance. During the placement process of the shell-shaped tooth appliance, it will pass through the first contact surface 102 and the second contact surface 104 in sequence. During the dislodgment process of the shell-shaped tooth appliance, it will separate from the second contact surface 104 and the first contact surface 102 in sequence. The shapes of the first contact surface 102 and the second contact surface 104 affect the placement and dislodgment of the shell-shaped tooth appliance, and also affect the retention force between the shell-shaped tooth appliance and the tooth 20 after placement. In actual situations, the first contact surface 102 can be partially or entirely set as a curved surface or an inclined surface, or the second contact surface 104 can be partially or entirely set as a curved surface or an inclined surface, or at least part of the first contact surface 102 and at least part of the second contact surface 104 can be set as a curved surface or an inclined surface simultaneously. Setting the contact surface as a curved surface or an inclined surface can facilitate the removal and wearing of the shell-shaped tooth appliance, and can also ensure that an appropriate retention force is formed between the shell-shaped tooth appliance and the tooth 20 after placement.

[0054] In addition, the edges of the first contact surface 102 and the edges of the second contact surface 104 can be set as arc shapes, so as to facilitate the placement and dislodgment of the shell-shaped tooth appliance. At the same time, it is convenient for the shell-shaped tooth appliance to wrap the edge of the long-arm attachment 11 without gaps.

[0055] In some embodiments, the projections of the bonding portion 111 and the extension portion 112 in the thickness direction can both be rectangles.

[0056] That is to say, the long-arm attachment 11 adopts the form of a rectangular attachment. The use of a rectangular attachment can be beneficial to realizing the overall movement of the tooth 20 and beneficial to closing the edentulous space. The shell-shaped tooth appliance acts on the rectangular attachment, and can generate a couple and form a couple moment. By increasing the length of the rectangular attachment, the magnitude of the couple moment can be increased, so that the force application line of the tooth 20 is close to the center of resistance, which is more beneficial to realizing the overall movement of the tooth 20. The rectangular attachment can be applied to Figure 5 the occasion of the movement of some teeth 20 shown in Figure 7 or the occasion of the movement of two adjacent teeth located at the edentulous space shown in

[0057] In some embodiments, the width of the bonding portion 111 and the extension portion 112 in the mesiodistal direction can be 1 to 2 millimeters.

[0058] The long-arm attachment 11 has a certain width, enabling both the mesial and distal sides to be subjected to the acting force from the shell-shaped tooth orthodontic appliance, forming a couple force to assist the overall movement of the tooth 20. At the same time, it avoids the situation where the expected movement purpose cannot be achieved due to too small a width, and also avoids affecting the seating of the shell-shaped tooth orthodontic appliance due to too large a width. The width W1 of the bonding portion 111 is the same as the width W2 of the extension portion 112, which can make the shape of the long-arm attachment 11 relatively regular and facilitate molding.

[0059] In some embodiments, the projection of the bonding portion 111 in the thickness direction may be trapezoidal, and the width of the bonding portion 111 gradually increases in the gingival-occlusal direction; and / or the projection of the extension portion 112 in the thickness direction is trapezoidal, and the width of the extension portion 112 gradually increases in the gingival-occlusal direction.

[0060] That is, the bonding portion 111 of the long-arm attachment 11 can be set as a trapezoid with a narrow bottom and a wide top, or the extension portion 112 of the long-arm attachment 11 can be set as a trapezoid with a narrow bottom and a wide top, or both the bonding portion 111 and the extension portion 112 can be set as trapezoids with a narrow bottom and a wide top. By making part or all of the long-arm attachment 11 form a trapezoid with a narrow bottom and a wide top, it can provide guidance for the seating and dislodgment of the shell-shaped tooth orthodontic appliance, facilitating the removal and wearing of the shell-shaped tooth orthodontic appliance.

[0061] In actual situations, the long-arm attachment 11 can also be set as a trapezoid with a wide bottom and a narrow top. The side surface of the long-arm attachment 11 presents an inclined state, which is beneficial to increasing the side surface area. The side surface of the long-arm attachment 11 corresponds to the adjacent surface of the tooth 20. By increasing the side surface area, it is beneficial to increase the force on the side surface. Especially after extending the long-arm attachment 11 to the area where the gingiva 30 is located, it can increase the adjacent area of the extension portion 112 in the area where the gingiva 30 is located, which is beneficial to realizing the overall movement of the tooth 20.

[0062] In some embodiments, the thickness D1 of the bonding portion 111 can be 0.5 to 1.2 millimeters, and the thickness D2 of the extension portion 112 can be greater than or equal to 3 millimeters.

[0063] The thickness D1 of the bonding portion 111 can be designed according to ordinary attachments. For example, it can be designed as 0.5 millimeters, 0.75 millimeters, 1 millimeter or 1.2 millimeters. While the thickness D2 of the extension portion 112 can be increased. The thickness of the extension portion 112 being greater than or equal to 3 millimeters can increase the contact area between the long-arm attachment 11 and the shell-shaped tooth orthodontic appliance at the corresponding gingiva 30. The thickness of the extension portion 112 can be more than 3 millimeters. Thereby increasing the magnitude of the force generated on the long-arm attachment 11, and similarly, it can also increase the magnitude of the moment generated on the long-arm attachment 11.

[0064] In some embodiments, the bonding portion 111 and / or the extension portion 112 include a support body disposed along the gingival-jaw direction, and a molding material that wraps the support body, and the mechanical strength of the support body is greater than that of the molding material.

[0065] The support body can be a wire or a metal framework, such as a stainless steel wire. The molding material is the main material when the long-arm attachment 11 is formed into a film, such as a resin material. By adding a support body to the position where the bonding portion 111 is located and / or the position where the extension portion 112 is located when manufacturing the long-arm attachment 11, the structural strength at the corresponding position can be improved, and the service life of the long-arm attachment 11 can be extended.

[0066] Some embodiments of the present application further provide a shell-shaped tooth orthodontic appliance, which includes a main housing and an outer extension housing extending from the edge of the main housing. The main housing has a first cavity for accommodating a plurality of teeth 20, and at least one second cavity for accommodating a part of an attachment. The outer extension housing is used to cover the other part of the attachment, and the attachment is the above-mentioned long-arm attachment 11.

[0067] The main housing is the part of the shell-shaped tooth orthodontic appliance that wraps around the teeth 20, and the outer extension housing is the part of the shell-shaped tooth orthodontic appliance that covers the extension portion 112 of the long-arm attachment 11 located in the area where the gingiva 30 is located. By extending the main housing, the shell-shaped tooth orthodontic appliance can cover the entire long-arm attachment 11, so as to interact in the entire extension direction of the long-arm attachment 11. By increasing the length of the mutual contact, the magnitude of the moment generated on the long-arm attachment 11 can be increased, so as to better achieve the purpose of moving the teeth 20.

[0068] In addition, the edge of the outer extension housing can be flush with the edge of the extension portion 112 of the long-arm attachment 11 away from the gingival margin.

[0069] That is, the outer extension housing does not completely wrap the long-arm attachment 11, and it is only necessary to keep it flush at the end of the long-arm attachment 11. This avoids the phenomenon of attachment breakage that may be caused when the shell-shaped tooth orthodontic appliance is dislocated, and avoids frequent replacement of the attachment.

[0070] Figure 8 and Figure 9 Taking the correction of closing the gap as an example, simulations are carried out on the long-arm attachment 11 and the shell-shaped tooth orthodontic appliance 40 provided by some embodiments of the present application. As Figure 8 shown, the long-arm attachments 11 are respectively fixed on two adjacent teeth with a toothless gap, and the corresponding parts of the shell-shaped tooth orthodontic appliance extending out of the two adjacent teeth cover the entire long-arm attachment 11. As Figure 9 shown ( Figure 9Different colors in the figure represent the movement of the teeth. The adjacent teeth have a certain tilt phenomenon, but there is no tendency for the adjacent teeth as a whole to tilt and move. This shows that increasing the length of the attachment and wrapping the attachment at the gum 30 with the shell-shaped dental appliance can better complete the invisible correction and achieve root movement control. That is, by increasing the wrapping to the gum 30 side, the correction force can be further increased, and the undesired movement of the tooth root can be reduced, thereby enhancing the root movement control effect of the tooth 20.

[0071] In some embodiments, reference Figure 10 and Figure 11 As shown, a through-hole structure 1121 for passing an archwire is also provided on the mesiodistal side of the extension portion 112 of the long arm attachment 11. Here, the mesiodistal side of the extension portion 112 refers to the surface perpendicular to the mesiodistal direction when the long arm attachment 11 is attached to the surface of the tooth 20. The through-hole structure 1121 penetrates the mesiodistal side of the extension portion 112. In this case, the shell-shaped dental appliance does not cover the portion of the extension portion 112 corresponding to the through-hole structure 1121. The through-hole structure 1121 is used to pass the archwire, so that the long arm attachment 11 can move along the archwire guiding direction, thereby achieving a better effect of assisting the movement of the tooth 20 and controlling the root. In some embodiments, reference Figure 11 As shown, a plurality of through-hole structures 1121 are provided on the mesiodistal surface of the extension portion 112 in the gingival-jaw direction, and different through-hole structures 1121 can be used according to different height requirements. In addition, when multiple long-arm attachments 11 are used together, the archwire can connect the multiple long-arm attachments 11 together through the through-hole structures 1121, so that the movement of multiple teeth 20 is more accurate.

[0072] In some embodiments, the shell-shaped dental appliance further comprises an archwire, and a through-hole structure 1121 for passing the archwire is provided on the mesiodistal side of the extension part 112 of the long arm attachment 11. When worn, the archwire passes through the through-hole structure 1121 to enable the long arm attachment 11 to move along the archwire guiding direction. Specifically, the two ends of the archwire are fixed to the immovable tooth 20 or the gum 30 through a structure with an anchoring function, for example, it can be a bracket attached to the surface of the tooth 20 that does not move or an anchoring nail fixed to the gum 30. The archwire is located in the gum 30 area at the corresponding position of the long arm attachment 11, and the through-hole structure 1121 on the extension part 112 is passed through the archwire. The size of the through-hole structure 1121 is 1.2 to 1.5 times the size of the archwire, ensuring that the long arm attachment 11 can slide on the archwire, and will not shake due to the large size difference during the sliding process, ensuring that the tooth 20 attached to the long arm attachment 11 can translate, so as to achieve a better effect of assisting the movement of the tooth 20 and controlling the root.

[0073] Those of ordinary skill in the art can understand that the above-described embodiments are specific examples for implementing the present application, and in actual applications, various changes can be made to them in form and details without departing from the spirit and scope of the present application.

Claims

1. A long arm attachment, characterized in that: include: The bonding part and the extension part are connected, the bonding part includes a bonding surface and a first contact surface arranged opposite to each other, the extension part includes a non-bonding surface and a second contact surface arranged opposite to each other, when the bonding surface is bonded to the teeth, the non-bonding surface faces the gums and is arranged at a distance from the corresponding gums, and the first contact surface and the second contact surface face the inner surface of the shell-shaped dental appliance.

2. The long arm attachment according to claim 1, characterized in that: The distance between the edge of the bonding portion close to the gingival margin and the edge of the extending portion away from the gingival margin in the length direction of the long arm attachment is 8 to 10 mm.

3. The long arm attachment according to claim 1, characterized in that: There is a preset distance between the non-bonding surface and the bonding surface in the sagittal direction to form a clearance area for avoiding the gums; When the bonding surface is bonded to the tooth, the distance between the non-bonding surface and the corresponding gum is greater than or equal to 1 mm.

4. The long arm attachment according to claim 1, characterized in that: The distance between the edge of the bonding surface close to the gingival margin and the gingival line at the corresponding position is 1 to 1.5 mm.

5. The long arm attachment according to claim 1, characterized in that: At least a portion of the first contact surface and / or at least a portion of the second contact surface is configured as a curved surface or an inclined surface.

6. The long arm attachment according to any one of claims 1 to 5, characterized in that: Projections of the bonding portion and the extending portion in the thickness direction are both rectangular.

7. The long arm attachment according to claim 6, characterized in that: The width of the bonding portion and the extending portion in the mesiodistal direction is 1 to 2 mm.

8. The long arm attachment according to any one of claims 1 to 5, characterized in that: The projection of the bonding portion in the thickness direction is a trapezoid, and the width of the bonding portion gradually increases in the gingival-maxillary direction; and / or the projection of the extending portion in the thickness direction is a trapezoid, and the width of the extending portion gradually increases in the gingival-maxillary direction.

9. The long arm attachment according to claim 1, characterized in that: The thickness of the bonding portion is 0.5 to 1.2 mm, and the thickness of the extending portion is greater than or equal to 3 mm.

10. The long arm attachment according to claim 1, characterized in that: The bonding portion and / or the extending portion comprises a support body arranged along the gingival-jaw direction, and a molding material wrapping the support body, and the mechanical strength of the support body is greater than the mechanical strength of the molding material.

11. The long arm attachment according to claim 1, characterized in that: A through hole structure for passing an arch wire is also provided on the proximal and distal sides of the extension portion.

12. A shell-shaped dental appliance, characterized in that: It comprises a main shell and an extended shell extending from the edge of the main shell, the main shell having a first cavity for accommodating a plurality of teeth, and at least one second cavity for accommodating a portion of an accessory, the extended shell being used to cover another portion of the accessory, and the accessory being the long arm accessory as described in any one of claims 1 to 10.

13. The shell-shaped dental appliance according to claim 12, characterized in that: The edge of the extended shell is flush with the edge of the extended portion of the long arm attachment away from the gingival margin.

14. The shell-shaped dental appliance according to claim 12, characterized in that: The shell-shaped dental appliance also includes an arch wire, and a through-hole structure for passing the arch wire is provided on the mesiodistal side of the extension portion. When worn, the arch wire passes through the through-hole structure to enable the long arm attachment to move along the arch wire guiding direction.

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