An orthodontic attachment and orthodontic kit for directional tilting and movement of teeth

Abstract

This invention discloses an orthodontic attachment and kit for directional tilting movement of teeth. The attachment includes a base plate and a body, with an archwire channel within the body. The body has a vertical central axis parallel to the long axis of the tooth; the perpendicular line from the mesial-distal central axis of the archwire channel has an axial tilt angle α relative to the vertical central axis, with an absolute value of 5°–30°. This axial tilt angle α is oriented according to the preset mesial or distal movement requirements of the teeth, thereby automatically generating a tilting guiding force under the action of a straight archwire. Furthermore, the archwire channel has a specific chamfered structure at the exit (mesial or distal exit) on the tooth movement direction side, expanding the channel space outward to form an arc-shaped transition. This invention, through a preset overcorrective axial tilt angle combined with a directional exit chamfer design, achieves efficient directional tilting movement of teeth without the need for the dentist to bend the archwire, while effectively reducing the angular resistance between the archwire and the channel wall, solving the problems of insufficient power and high friction in the dynamic movement phase of traditional orthodontic attachments.

Description

Technical Field

[0001] This invention belongs to the field of orthodontic technology, specifically relating to an orthodontic attachment and orthodontic kit that enables teeth to move in a directional tilt. Background Technology

[0002] In the field of orthodontic treatment, orthodontic attachments (mainly including orthodontic brackets bonded to the anterior teeth and premolars, and orthodontic buccal tubes bonded to the molars) are the core components for transmitting orthodontic forces. Traditional straight wire orthodontic techniques generally adopt a "preset average" design, that is, the axial inclination, torque, and other parameters of its archwire channel (groove or lumen) are set based on the average static anatomical position of a normal dentition.

[0003] This "static goal-oriented" design reveals significant limitations in the directional movement stage after alignment and leveling, especially when it involves the tilting movement of premolars or molars (e.g., distal movement of molars in Class II malocclusion, distal movement of canines / premolars in extraction cases, etc.), presenting the following technical challenges: Lack of active tilting force: The channel angle design of conventional orthodontic attachments is intended to keep teeth upright and cannot automatically generate a torque to tilt them. To achieve directional tilting, dentists must bend complex curves (such as backward tilting curves, V-shaped curves, etc.) on the archwire. This not only increases chairside operation time, but also makes it difficult to standardize the bending accuracy, and the force applied is difficult to control precisely due to differences in archwire springback.

[0004] The "locking" effect is significant, and the frictional resistance is high: When the archwire guides the teeth to move at an angle, it will form an angular contact with the mesial or distal edge of the channel, producing a significant "locking" effect. The channel opening of conventional accessories is usually a right angle or has only a slight process chamfer, which leads to a sharp increase in the angular resistance between the archwire and the channel wall, often causing the tooth movement to stop.

[0005] The contradiction between drag reduction and control: To reduce friction, some existing technologies simply increase the channel diameter or set symmetrical large chamfers. However, while this symmetrical design reduces drag, it also loses control over the teeth, which can easily lead to loss of control of the teeth in directions where movement is not needed (such as accidental twisting or tilting), making it impossible to achieve precise "directional" control.

[0006] Orthodontic attachment type mismatch: Existing functional improvements mostly focus on brackets, while paying less attention to buccal tubes in the molar region. In fact, distal tilting of molars is often a key anchorage preparation step in orthodontic treatment, and the lack of dedicated functional buccal tubes limits the overall orthodontic efficiency.

[0007] Therefore, there is an urgent need for an orthodontic accessory that can automatically generate directional tilting couples through built-in structural parameters, has drag reduction design for specific directions of movement, and can cover both bracket and buccal tube forms. Summary of the Invention

[0008] The purpose of this invention is to provide an orthodontic attachment and orthodontic kit that enables teeth to move in a directional tilt.

[0009] To achieve the above objectives, the first aspect of the present invention provides an orthodontic attachment for directional tilting and movement of teeth, comprising a base plate and a body fixedly connected to the base plate, wherein the body has an archwire channel for accommodating archwires, characterized in that the body has a vertical central axis, wherein when the orthodontic attachment is disposed on the tooth surface, the vertical central axis extends parallel to the long axis of the tooth. The archwire channel has a mesiodistal central axis, and the perpendicular line of the mesiodistal central axis of the archwire channel is inclined relative to the vertical central axis, and the angle formed between the two is the axial tilt angle α, the absolute value of the axial tilt angle α is 5° to 30°; Furthermore, the inclination direction of the archwire channel is configured as follows: When used to guide teeth to move distally, the archwire channel is perpendicular to the central axis from mesial to distal, tilting toward the distal side of the body. Alternatively, when used to guide teeth to move mesially, the perpendicular line from the mesial to the central axis of the archwire channel is inclined toward the mesial side of the body.

[0010] In one embodiment of the present invention, the orthodontic accessory is an orthodontic bracket or an orthodontic buccal tube; When the orthodontic accessory is an orthodontic bracket, the archwire channel is an open groove with a buccal opening; When the orthodontic accessory is an orthodontic buccal tube, the archwire channel is a closed or semi-closed lumen.

[0011] In one embodiment of the present invention, the bowwire channel has a proximal outlet located near the middle end of the body and a distal outlet located at the distal end of the body; The channel wall at the near-center exit and / or the far-center exit is provided with a chamfered structure; The chamfered structure is configured to widen the space of the archwire channel at the exit to reduce the angular resistance between the archwire and the channel wall when the teeth move at an angle.

[0012] In one embodiment of the present invention, the chamfer structure is only provided on the channel wall at the exit on the moving direction side of the tooth; The specific configuration is as follows: When the orthodontic attachment is used to guide teeth to move distally, the chamfered structure is disposed at the distal exit. When the orthodontic attachment is used to guide teeth to move mesially, the chamfered structure is located at the mesial exit.

[0013] In one embodiment of the present invention, the chamfer structure is an arc-shaped chamfer formed on the channel wall surface; The radius of the arc-shaped chamfer is 0.1mm to 0.5mm, so as to form a smooth transition between the inner wall surface of the bowwire channel and the end face of the outlet.

[0014] In one embodiment of the present invention, the axial tilt angle α is configured according to the tooth movement type: When the orthodontic accessory is an orthodontic buccal tube and is configured to guide the molar to tilt distally, the axial tilt angle α is -15° to -25°, where the negative sign represents tilting distally. When the orthodontic accessory is an orthodontic bracket and is configured to guide the premolar to tilt towards the mesial direction, the axial tilt angle α is +5° to +15°, where a plus sign represents tilting towards the mesial direction.

[0015] In one embodiment of the present invention, the main body is provided with an auxiliary retaining structure; When the orthodontic accessory is an orthodontic bracket, the auxiliary retention structure is a ligature wing, and the ligature wing narrows in the direction of the preset movement direction of the tooth; When the orthodontic accessory is an orthodontic buccal tube, the auxiliary retention structure is an integrally formed or welded traction hook to the gingival side of the body.

[0016] In one embodiment of the present invention, the side of the base plate away from the body is the tooth-fitting surface; The tooth veneer surface is provided with a retention structure to enhance adhesion.

[0017] In one embodiment of the present invention, the retaining structure includes at least one of a metal mesh base, a sandblasted surface, a laser-etched texture, or a dovetail groove structure.

[0018] A second aspect of the present invention provides an orthodontic kit comprising at least two of the above-described orthodontic attachments; At least one of the orthodontic attachments is an orthodontic buccal tube disposed on a molar, and at least one of the orthodontic attachments is an orthodontic bracket disposed on a premolar or anterior tooth; The two have different axial tilt angles α, so that under the action of the same straight archwire, teeth in different positions can produce different degrees of directional tilting movement.

[0019] Compared with the prior art, the present invention has the following beneficial effects: 1. The orthodontic accessory provided by this invention breaks through the traditional straight wire appliance's "passive maintenance" design concept, transforming it into an "active driving" element. By pre-setting a specific axial tilt angle α (5°~30°) within the archwire channel of the appliance, when a standard straight archwire is inserted into the slot, the archwire is forced into contact with the inclined channel wall and automatically generates a force couple. This allows the dentist to obtain continuous and stable driving force without performing complex archwire bending (such as V-shaped bends or backward tilting bends) at the chairside, driving the teeth to tilt in a preset direction (mesial or distal), significantly reducing the dentist's operational difficulty and shortening chairside time.

[0020] 2. To address the problem of locking effect that easily occurs when teeth tilt and move, the orthodontic attachment provided by this invention adopts a unilateral chamfer structure; On the moving side (near or far exit): A rounded chamfer (preferably R0.1mm~0.5mm) is provided, making the exit flared outwards like a trumpet. This design effectively alleviates stress concentration during archwire deformation, transforms "point contact" into "surface contact," avoids the scratching effect of sharp edges on the archwire, and significantly reduces the frictional resistance when the teeth move in the target direction.

[0021] On the non-moving side: most have no chamfer or a small chamfer. This asymmetrical design retains the constraint force of the channel wall on the archwire (i.e., relatively increases friction), thus forming an effective fulcrum. This "loose on one side, tight on the other" mechanism ensures that the teeth can only tilt in the preset direction, effectively preventing accidental wobbling or loss of control of the teeth during movement.

[0022] 3. The orthodontic attachments provided by this invention, through the flexible configuration of the axial tilt angle α, not only enable conventional tooth movement, but also offer new solutions for more complex cases: Anchorage control: For the buccal canal of molars, by presetting the negative axis tilt angle, the "anchorage preparation" (backward tilt) of the molars can be realized, which can effectively resist the reaction force when the anterior teeth retract and prevent the molars from moving forward.

[0023] Masking treatment: In non-extraction orthodontic treatment or Class II / III malocclusion treatment, this attachment can be used to efficiently move molars backward or premolars mesially, thereby making full use of the interdental spaces and solving crowding or overjet problems.

[0024] 4. Because the orthodontic attachment of this invention generates a large tilting moment during operation, the base plate needs to withstand greater shear forces than conventional orthodontic appliances. To address this, this invention features a specially designed reinforced retention structure (such as a metal mesh base, sandblasted or laser-etched texture) on the tooth occlusal surface of the base plate, combined with an optimized base surface, significantly improving mechanical interlocking force and adhesive strength. This ensures that the attachment remains stable even when continuously generating active tilting forces, preventing it from falling off due to excessive stress.

[0025] 5. The orthodontic attachments provided by this invention offer intuitive visual guidance to clinicians through their specially designed appearance (such as the narrowing direction of the bracket ligature wings pointing in the direction of movement, or the specific position of the buccal tube traction hook). This effectively solves the problem that functional attachments are prone to causing incorrect tooth movement due to incorrect bonding direction (such as left-right reversal or mesiodistal reversal), significantly improving the safety and accuracy of clinical procedures. Attached Figure Description

[0026] Other features, objects, and advantages of the present invention will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings: Figure 1 This is a schematic diagram of the orthodontic bracket in Embodiment 1 of the present invention, which causes the teeth to tilt and move mesially. Figure 2 This is a schematic diagram of the orthodontic buccal tube in Embodiment 2 of the present invention, which causes the teeth to tilt and move distally. Figure 3 This is a schematic diagram of the application of the orthodontic kit in the third embodiment of the present invention in the treatment of Class II malocclusion, showing that the maxillary posterior teeth are moved distally by the negative axial tilt angle of the buccal tube; Figure 4 This is a schematic diagram of the application of the orthodontic kit in the third embodiment of the present invention in the treatment of Class III malocclusion. It shows that the mandibular posterior teeth are tilted mesially by the positive axial tilt of the bracket, thereby shortening the length of the mandibular dental arch. Explanation of reference numerals in the attached figures: 1. Axis tilt angle α; 2. Vertical central axis; 3. Near-to-far center axis; 4. Perpendicular line of the near-to-far center axis; 5. Chamfered structure; 6. Body; 7. Base plate; 8. Auxiliary retention structure. Detailed Implementation

[0027] The present invention will now be described in detail with reference to specific embodiments. These embodiments will help those skilled in the art to further understand the present invention, but do not limit the invention in any way. It should be noted that those skilled in the art can make several changes without departing from the concept of the present invention.

[0028] In embodiments of the present invention, the terms "upper," "lower," "left," "right," "front," "rear," "top," "bottom," "inner," "outer," "middle," "vertical," "horizontal," "lateral," and "longitudinal" indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings. These terms are primarily for the purpose of better describing the present invention and its embodiments, and are not intended to limit the indicated devices, elements, or components to having a specific orientation, or to be constructed and operated in a specific orientation.

[0029] Furthermore, in addition to indicating direction or positional relationship, some of the aforementioned terms may also have other meanings. For example, the term "above" may also be used in certain situations to indicate a dependency or connection. Those skilled in the art can understand the specific meaning of these terms in this invention based on the specific circumstances.

[0030] Furthermore, the terms "installation," "setting," "equipped with," "opening," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral structure; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium, or an internal connection between two devices, components, or parts. Those skilled in the art can understand the specific meaning of these terms in this invention according to the specific circumstances.

[0031] Furthermore, the terms "first," "second," "I," "II," etc., are primarily used to distinguish different devices, components, or parts (which may be the same or different in specific type and construction), and are not intended to indicate or imply the relative importance or quantity of the indicated devices, components, or parts. Unless otherwise stated, "a plurality of" means two or more.

[0032] The terms "anterior region" and "posterior region" mentioned in the various embodiments of this application are defined according to the classification of teeth in the 2nd edition of "Introduction to Stomatology" published by Peking University Medical Press, pages 36-38. These include premolars and molars, teeth marked as 4-8 in the FDI marking method, and teeth marked as 1-3 in the anterior region in the FDI marking method.

[0033] To more clearly describe the present invention, the specific terms used in the specification and claims are uniformly defined and explained below with reference to the accompanying drawings. Unless otherwise stated, the following definitions apply to all embodiments of this application.

[0034] Orthodontic attachments: The term "orthodontic attachments" as used in the claims and description of this invention is a broader concept, including but not limited to orthodontic brackets bonded to the surfaces of anterior teeth and premolars, and orthodontic buccal tubes bonded to the surfaces of molars.

[0035] Archwire passage: refers to the spatial structure within the orthodontic accessory body used to accommodate and constrain the orthodontic archwire.

[0036] When the orthodontic attachment is an orthodontic bracket, the channel is usually presented as an open groove with a buccal opening; When the orthodontic attachment is an orthodontic buccal tube, the channel is usually a closed tube or a tube with a slit on only one side.

[0037] Near-center exit and far-center exit: These refer to the opening areas of the archwire channel at the near-center and far-center end faces of the body, i.e., the physical interfaces through which the archwire enters or exits the body. For brackets, it refers to the cross-sections at both ends of the groove; for cheek tubes, it refers to the opening of the tube opening.

[0038] Mesial and distal sides: These refer to the positional relationship of orthodontic attachments relative to the midline of the dental arch when they are installed on the tooth surface. The side closer to the midline of the dental arch is called the "mesial side," and the side farther from the midline is called the "distal side." The terms "mesial / distal side of the body" or "archwire channel tilted mesial / distal" mentioned in this invention are all based on this anatomical orientation.

[0039] Gingival and Occlusal directions refer to the vertical orientation of orthodontic attachments. The side closer to the gingival margin is the "gingival side," and the side closer to the occlusal surface or incisal edge of the dentition is the "occlusal side." For example, the "traction hook positioned on the gingival side" described in this invention means that the traction hook points towards the tooth root.

[0040] Vertical central axis: This refers to a geometric reference line designed on the orthodontic attachment body (especially the labial / buccal surface). Physically, this axis typically corresponds to the midline notch on the bracket surface, positioning markers (such as colored dots), the geometric symmetry center line of the ligature wings, or the mesiodistal positioning groove / midpoint of the buccal tube. This axis is the primary visual reference benchmark for physicians when performing clinical bonding procedures.

[0041] Regarding the phrase "parallel to the long axis of the tooth": The "vertical central axis extending parallel to the long axis of the tooth" as described in this invention means that in clinical practice, the orthodontist only needs to follow standard straight wire bonding procedures, aligning or bonding the vertical midline of the orthodontic attachment with or parallel to the anatomical long axis of the tooth (usually the line connecting the midpoint of the cusp / incisal edge and the highest point of the gingiva), without any artificial deflection. The unique tilting effect of this invention is achieved by a pre-set deflection of the attachment's internal structure relative to this axis.

[0042] The proximal-distal central axis of the archwire channel refers to a virtual straight line that runs through the internal space of the archwire channel (groove or lumen), parallel to the channel sidewalls, and located at the geometric center of the channel. When the archwire is inserted into the channel, its main extension direction usually coincides with this axis everywhere.

[0043] The perpendicular line to the mesial-distal central axis of the archwire passage: refers to a straight line on the plane (or tangent plane) where the orthodontic attachment baseplate is located, intersecting the aforementioned "mesial-distal central axis of the archwire passage" at a 90° angle. This perpendicular line represents the vertical direction that the archwire passage should correspond to in an ideal state (i.e., without axial tilt).

[0044] Axis tilt angle α: refers to the acute angle formed between the "perpendicular line from the proximal to distal central axis of the archwire channel" and the "perpendicular central axis". For ease of quantitative description, this application specifies: A positive value (+) indicates a mesial inclination. That is, the occlusal end of the aforementioned "vertical line" is tilted mesially relative to the "vertical central axis." This will cause the crown to move mesially and the root to move distally.

[0045] Negative value (-): indicates distal tilt. That is, the occlusal end of the aforementioned "vertical line" is tilted distally relative to the "vertical central axis" of the tooth. This will cause the crown to move distally and the root to move mesially.

[0046] In conventional straight wire archwire brackets, this angle is typically set to a value that causes the tooth root to tilt distally and the crown to tilt mesially (e.g., +5° to +11° for canines). This invention, however, innovatively sets this angle to a significant deflection value (e.g., a large negative or positive angle with an absolute value of 5° to 30°). This means that when the straight archwire is inserted into the channel, a forced angular couple is generated between the archwire and the channel wall because the archwire axis is not aligned with the channel axis. This couple acts as an active driving force, causing the crown to tilt directionally in the mesial-distal direction, thereby achieving rapid tooth movement without the need for the dentist to bend the archwire.

[0047] Chamfered structure: refers to a smooth transition surface formed at the edge of the channel wall near the middle exit and / or far the middle exit through cutting, grinding or molding processes.

[0048] Funnel-shaped: The chamfer described in this invention is not merely a process chamfer for removing burrs, but has specific geometric dimensions (preferably an arc surface with a radius R of 0.1mm to 0.5mm), so that the archwire channel presents a "narrow inside and wide outside" shape at a specific exit.

[0049] The asymmetrical or directional chamfering in this invention significantly reduces the frictional resistance when teeth move towards the target direction. Specifically, when the archwire channel has a pre-set large axis inclination angle, forcibly pressing in a straight archwire will generate extremely high contact pressure at the sharp edge of the channel. This directional chamfered surface can accommodate the elastic deformation of the archwire, transforming the "point / line contact" between the archwire and the sharp edge of the channel opening into a smooth "surface contact." This prevents the archwire from getting stuck or developing marks, significantly reducing the frictional resistance when teeth move towards the target direction.

[0050] Reference Figure 1 As shown, this embodiment provides an orthodontic attachment that causes teeth to tilt and move mesially.

[0051] This embodiment provides an orthodontic accessory, specifically an orthodontic bracket configured on a premolar (such as a second premolar) or canine, for guiding the tooth to tilt and move mesially (e.g., for correcting Class III malocclusion or closing extraction gaps).

[0052] In this embodiment, the orthodontic bracket is made of medical-grade stainless steel (such as 17-4PH stainless steel) and manufactured in one piece using metal injection molding (MIM) process. The surface is treated with high-precision polishing to reduce plaque adhesion.

[0053] like Figure 1 As shown, the orthodontic bracket includes a base plate 7 and a body 6 (bracket body) fixedly connected to the base plate. The bracket body has an archwire channel for accommodating the archwire, i.e., a groove with a cheek-facing opening.

[0054] The bracket body has a positioning marking line printed on its surface. When the bracket is placed on the tooth surface, the marking line (perpendicular to the central axis 2) extends in a direction parallel to the long axis of the tooth.

[0055] The archwire groove has a mesiodistal central axis 3. Considering the relatively short movement distance of the premolar and the need to overcome periapical bone resistance, to generate an active mesiodistal tilting force, the perpendicular line of the mesiodistal central axis 3 (i.e., the long axis perpendicular line 4 of the archwire groove) is tilted relative to the vertical central axis 2 of the bracket body, forming an axial tilt angle α. In this embodiment, the axial tilt angle α is set to +10°. Specifically, the long axis perpendicular line 4 of the archwire groove tilts towards the mesiodistal side of the bracket body. When the straight wire enters the groove, this positive axial tilt angle forces the archwire to deform, generating a couple that tilts the crown mesiodistally and moves the root distally.

[0056] See Figure 1 To reduce resistance and prevent locking during mesial movement, the groove edge chamfer 5 is only located on the channel wall at the mesial exit (i.e., the side in the direction of tooth movement). This chamfer structure is a circular arc chamfer with a radius R = 0.2 mm, making the groove flare outward at the mesial exit; while there is no chamfer or a very small chamfer at the distal exit. This asymmetrical design ensures that when the tooth tilts mesially, the archwire makes smooth contact with the mesial wall (resistance reduction); while the distal wall maintains constraint on the archwire (fulcrum control), thereby achieving precise directional movement.

[0057] Furthermore, such as Figure 1 As shown, the bracket body is equipped with auxiliary retention structures 8 (ligation wings). To prevent incorrect clinical bonding direction, the ligation wings are designed with an asymmetrical shape, with their narrowing direction pointing towards the mesial side of the bracket (i.e., the preset direction of tooth movement), serving as visual guidance. Furthermore, the bracket body has two ligation wings on both the gingival and radial sides, with ligation grooves 0.3 mm wide on each ligation wing for fixing the archwire to the groove using stainless steel ligation wire or rubber bands. Although the ligation wings are arranged vertically, to achieve a visual directional indication function, the ligation wings 8 have an asymmetrical streamlined design in the mesiodistal direction, with their narrowing direction (i.e., the direction the wing tip points) pointing towards the mesial side of the bracket.

[0058] In this embodiment, an 80-mesh layered stainless steel mesh is laser-welded or integrally formed on the tooth-fitting surface of the bracket base plate as a micro-rough structure to increase the bonding surface area and ensure that the bracket does not fall off under a large tilting force.

[0059] Example 2 This embodiment provides an orthodontic attachment for distally tilting and moving teeth, specifically an orthodontic buccal tube for the maxillary first or second molar, used to guide the molar to tilt and move distally (e.g., for correcting Class II malocclusion or pushing molars backward).

[0060] like Figure 2 As shown, the orthodontic buccal tube includes a base plate 7 and a body 6 (buccal tube body). The buccal tube body has an archwire channel for accommodating the archwire, which is a closed or semi-closed lumen.

[0061] The buccal tube has a vertical central axis 2, which is defined as the mesiodistal geometric center line of the tube or the positioning groove on the surface of the tube. During clinical bonding, this axis should be aligned with the buccal groove of the tooth or parallel to the long axis of the tooth.

[0062] The lumen has a proximal-distal long axis 3, the perpendicular of which is the buccal canal long axis perpendicular line 4. This perpendicular line 4 is tilted negatively relative to the vertical central axis 2, forming an axial tilt angle α.

[0063] To facilitate the posterior molar pushing tactic in non-extraction orthodontic treatment, the buccal canal lumen in this embodiment is configured with a negative major axis tilt angle, specifically -20°. The buccal canal's long axis perpendicular line 4 is tilted distally towards the body 6 (buccal canal body). When the straight archwire tip is inserted into the lumen, the archwire makes forced contact with the lumen wall, generating a torque that causes the molar crown to tilt distally. This is highly effective for correcting mesial tilt of molars (overhang caused by missing teeth) or for extending the dental arch length.

[0064] Given that the buccal cannula is typically located at the end of the archwire, friction control is particularly critical. In this embodiment, a flared chamfered structure 5 (buccal cannula edge chamfer) is formed at the distal outlet of the lumen through an internal bore grinding process. See [link to documentation]. Figure 2 The buccal canal has a chamfered edge at the distal exit (i.e., the side in the direction of tooth movement). This chamfer is an arc-shaped surface formed by flaring the inner hole, with a radius preferably of 0.3 mm. When the molar tilts distally, the end of the archwire smoothly transitions at the distal canal opening, avoiding edge jamming; while the mesial canal opening maintains its original shape to maintain control over the molar.

[0065] like Figure 2 As shown, an auxiliary retention structure 8 (traction hook) is integrally formed on the gingival side (pointing towards the gingiva) of the body 6 (buccal tube body) for attaching traction elements to assist distal movement.

[0066] Example 3 This embodiment provides an orthodontic kit comprising at least one orthodontic bracket (+10° axial tilt) as described in Embodiment 1 and at least one orthodontic buccal tube (-20° axial tilt) as described in Embodiment 2.

[0067] Application Scenario 1: Correction of Class II malocclusion ( Figure 3 ) like Figure 3 As shown, the buccal tube described in Example 2 is bonded to the maxillary molar, and the bracket (or conventional bracket) described in Example 1 is bonded to the anterior teeth. After the archwire is inserted, the molar is driven to tilt distally (in the direction indicated by the arrow) using the -20° axial tilt angle of the buccal tube, thereby creating space or correcting the molar relationship.

[0068] Application Scenario 2: Orthodontic treatment of Class III malocclusion or shortening of the mandibular arch ( Figure 4 ) like Figure 4 As shown, the orthodontic bracket described in Example 1 is bonded to the mandibular premolar or canine, and the buccal tube (or conventional buccal tube) described in Example 2 is bonded to the molar. However, in this scenario, the focus is on utilizing the orthodontic bracket's +10° axial tilt angle to drive the premolar and posterior teeth to tilt and move mesially (in the direction indicated by the arrow), thereby shortening the mandibular arch length or closing extraction gaps. With the above configuration, the same straight archwire can produce differentiated directional movement effects based on the attachment parameters of different tooth positions.

[0069] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. An orthodontic attachment for enabling a tooth to be moved in a directed tipping movement, comprising a base plate and a body fixedly connected to the base plate, the body being provided with an archwire channel for accommodating an archwire, characterized in that, The body has a vertical central axis, and when the orthodontic attachment is placed on the tooth surface, the vertical central axis extends parallel to the long axis of the tooth. The archwire channel has a mesiodistal central axis, and the perpendicular line of the mesiodistal central axis of the archwire channel is inclined relative to the vertical central axis, and the angle formed between the two is the axial tilt angle α, the absolute value of the axial tilt angle α is 5° to 30°; Furthermore, the inclination direction of the archwire channel is configured as follows: When used to guide teeth to move distally, the archwire channel is perpendicular to the central axis from mesial to distal, tilting toward the distal side of the body. Alternatively, when used to guide teeth to move mesially, the perpendicular line from the mesial to the central axis of the archwire channel is inclined toward the mesial side of the body.

2. The orthodontic attachment for directed tipping movement of a tooth according to claim 1, wherein, The orthodontic accessory is an orthodontic bracket or orthodontic buccal tube; When the orthodontic accessory is an orthodontic bracket, the archwire channel is an open groove with a buccal opening; When the orthodontic accessory is an orthodontic buccal tube, the archwire channel is a closed or semi-closed lumen.

3. The orthodontic attachment for directed tipping tooth movement of claim 1, wherein, The bowwire channel has a proximal outlet located near the middle end of the body and a distal outlet located at the distal end of the body; The channel wall at the near-center exit and / or the far-center exit is provided with a chamfered structure; The chamfered structure is configured to widen the space of the archwire channel at the exit to reduce the angular resistance between the archwire and the channel wall when the teeth move at an angle.

4. The orthodontic attachment for directed tipping movement of a tooth according to claim 3, wherein The chamfered structure is only provided on the channel wall at the exit on the side of the tooth's movement direction; The specific configuration is as follows: When the orthodontic attachment is used to guide teeth to move distally, the chamfered structure is disposed at the distal exit. When the orthodontic attachment is used to guide teeth to move mesially, the chamfered structure is located at the mesial exit.

5. The orthodontic attachment for directed tipping tooth movement of claim 3, wherein, The chamfer structure is an arc-shaped chamfer formed on the wall of the channel; The radius of the arc-shaped chamfer is 0.1mm to 0.5mm, so as to form a smooth transition between the inner wall surface of the bowwire channel and the end face of the outlet.

6. The orthodontic attachment for directional tilting and movement of teeth according to claim 2, characterized in that, Configure the axial tilt angle α according to the tooth movement type: When the orthodontic accessory is an orthodontic buccal tube and is configured to guide the molar to tilt distally, the axial tilt angle α is -15° to -25°, where the negative sign represents tilting distally. When the orthodontic accessory is an orthodontic bracket and is configured to guide the premolar to tilt towards the mesial direction, the axial tilt angle α is +5° to +15°, where a plus sign represents tilting towards the mesial direction.

7. The orthodontic attachment for directional tilting and movement of teeth according to claim 2, characterized in that, The main body is provided with an auxiliary retention structure; When the orthodontic accessory is an orthodontic bracket, the auxiliary retention structure is a ligature wing, and the ligature wing narrows in the direction of the preset movement direction of the tooth; When the orthodontic accessory is an orthodontic buccal tube, the auxiliary retention structure is an integrally formed or welded traction hook to the gingival side of the body.

8. The orthodontic attachment for directional tilting and movement of teeth according to claim 1, characterized in that, The side of the base plate away from the body is the tooth-fitting surface; The tooth veneer surface is provided with a retention structure to enhance adhesion.

9. The orthodontic attachment for directional tilting and movement of teeth according to claim 8, characterized in that, The retention structure includes at least one of a metal mesh base, a sandblasted surface, a laser-etched texture, or a dovetail groove structure.

10. An orthodontic kit, characterized in that, Includes at least two orthodontic attachments as described in any one of claims 1 to 9; At least one of the orthodontic attachments is an orthodontic buccal tube disposed on a molar, and at least one of the orthodontic attachments is an orthodontic bracket disposed on a premolar or anterior tooth; The two have different axial tilt angles α, so that under the action of the same straight archwire, teeth in different positions can produce different degrees of directional tilting movement.

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