Posterior implant-supported anterior tooth intrusion aid, force application and its application

Abstract

This invention discloses a posterior implant-supported anterior tooth intrusion aid, its force application method, and its application. The anterior tooth intrusion aid includes two implants and an intrusion arch. The two implants correspond to the spaces between the roots of the second premolar and the first molar on the left and right buccal sides, respectively. The left and right ends of the intrusion arch are rotatably connected to the left and right implants, respectively. The intrusion arch is arch-shaped, with its front end corresponding to the anterior gingival side. This posterior implant-supported anterior tooth intrusion aid uses posterior implants as anchorage to provide support force for anterior tooth intrusion. During the force application process, it has minimal additional impact on the posterior teeth, generating only a simple anterior tooth intrusion force. The intrusion effect is stable and controllable, reducing side effects. Furthermore, due to similar mechanical properties, it can be used to replace anterior anchorage screws for anterior tooth intrusion, avoiding the damage caused by additional anchorage screws.

Description

Technical Field

[0001] This invention relates to the field of orthodontics, and more particularly to orthodontic aids for deep overbite, force application methods, and novel applications for posterior implants. Background Technology

[0002] Occlusal control is one of the key technical aspects of orthodontic treatment; good anterior occlusion is essential for achieving optimal aesthetic and functional results. In a normal vertical occlusion, the upper anterior teeth occlude within the incisal third of the lower anterior crown, or the incisal edge of the lower anterior teeth occludes within the lingual incisal third of the upper anterior teeth; anything exceeding one-third is considered deep overbite. Occlusal control is crucial for successful orthodontic treatment. However, in fixed-orthodontic cases involving tooth extraction, controlling occlusion by intruding the anterior teeth is challenging. Firstly, the presence of extraction gaps disrupts the stress on the archwire in the mid-arch, resulting in weaker archwire control and difficulty in fully transmitting corrective forces to the anterior teeth. Secondly, there are side effects of tooth movement during extraction treatment. During anterior tooth retraction, the corrective force acts on the brackets and archwire, pulling the anterior teeth posteriorly. This force is directed towards the center of anterior tooth resistance, causing lingual tilting and elongation, leading to deeper occlusion. Especially with the widespread use of implant anchorage screws in orthodontics, more and more patients are opting for posterior implants to retract their anterior teeth as much as possible, thereby maximizing the improvement of tooth and facial convexity. However, in this case, the extraction gap is entirely closed by anterior tooth retraction. Due to the excessive distance the anterior teeth move, the aforementioned side effects of tooth movement are more pronounced, and anterior occlusal control becomes extremely difficult. Furthermore, if the patient already has a deep overbite before treatment, intruding the anterior teeth during treatment is also more challenging.

[0003] Currently, the commonly used methods for anterior tooth occlusion control in clinical practice are implanting 1-2 implants in the anterior teeth or using traditional intrusion archwires. However, both methods have significant drawbacks. The former involves directly implanting the implant anchorage at the root apex of the anterior teeth and suspending and pulling the archwire in the anterior teeth region with an elastic rubber chain, thereby intruding the anterior teeth towards the gum line, resulting in high intrusion efficiency. However, since it requires the additional implantation of 1-2 implant anchorage screws, it undoubtedly may cause various negative effects of implant anchorage screws, including trauma, bleeding, pain, and infection. The alveolar bone between the roots of the anterior teeth is generally narrow in width and thickness, making implant placement more difficult and requiring a high level of clinical experience from the dentist; otherwise, risks such as root damage and alveolar bone perforation may occur. The frenulum and lips in the anterior teeth region have greater mobility, and the implants are prone to friction with these soft tissues, causing traumatic ulcers. Moreover, the gingiva in the anterior teeth region is also prone to inflammation and hyperplasia, covering the implants, causing unnecessary surgical procedures and pain, reducing treatment efficiency and patient comfort. Traditional indentation archwires involve bending the archwire into a specific shape and using its elasticity to indent the anterior teeth. However, these archwires are fragmented, only incorporating the anterior teeth and molars while skipping the premolars. The procedure involves first indenting the anterior teeth, then replacing the archwire with a standard one to align all the teeth. This significantly increases treatment time and reduces efficiency. Furthermore, the side effects are quite noticeable. The anterior teeth actually experience some labial tilting, which is detrimental to anterior tooth retraction and increases the risk of alveolar bone fracture and gingival recession. Simultaneously, the molars undergo uncontrolled distal tilting and elongation, negatively impacting the functional occlusion of the posterior teeth. Therefore, a simple and efficient method for controlling anterior tooth occlusion is urgently needed in clinical practice.

[0004] Chinese patent CN202821676U discloses an anterior tooth indentation elastic archwire, specifically including the following: The anterior tooth indentation elastic archwire comprises an arc-shaped archwire and left and right hooks at both ends of the archwire. The archwire has upward left and right bends at positions corresponding to the distal or mesial positions of the two canines, causing the portion of the archwire between the canines to fold upward, forming an upper arc-shaped anterior portion. A second bend is provided between the left and right bends of the archwire and the left and right hooks, which can further increase the elasticity of the archwire. When used in conjunction with the main archwire for orthodontic treatment of the upper teeth, the upper auxiliary archwire is attached to the main archwire of the upper teeth via left and right hooks, with the front upper arch-shaped body facing upwards, directly towards the upper gum line. The left and right hooks are positioned between the second premolar and the first molar on both sides of the upper teeth. The upper arch-shaped body of the upper auxiliary archwire is then ligated and fixed to the main archwire at the corresponding position of the upper anterior teeth using ligature wires. When used for orthodontic treatment of the lower teeth, the lower auxiliary archwire is attached to the main archwire of the lower teeth via left and right hooks, respectively, in the opposite direction. The front upper arch-shaped body faces downwards, directly towards the lower gum line. The left and right hooks are positioned between the second premolar and the first molar on both sides of the lower teeth. If the lower second molar is included in the orthodontic system, the hook position is between the first and second molars.

[0005] The anterior intrusion elastic auxiliary arch used in the aforementioned patent provides support for the anterior intrusion effect from the posterior teeth and the main archwire. During the force application process, it can cause the posterior teeth to elongate. Although it can open the bite, the elongation of the posterior teeth may lead to other side effects, including loss of planar control in high-angle patients leading to facial deterioration, or posterior tooth interference causing joint problems.

[0006] Furthermore, in the aforementioned patent, the anterior tooth indentation elastic auxiliary arch needs to be fully secured to the main orthodontic archwire. During tooth movement, as the extraction gap closes, the length of the dental arch gradually decreases. However, since the length of this device is not adjustable, it will inevitably collide and squeeze with the anterior or posterior tooth brackets, thereby interfering with the closure of the extraction gap and reducing treatment efficiency.

[0007] In this article, "dental occlusion" is a professional term in oral medicine. The English word is "occlusion". "Dental occlusion" is a character with a left-right structure. Since the character is not found in the general character set, it is replaced by "𬌗". Summary of the Invention

[0008] In view of this, the present invention proposes a posterior implant-supported anterior tooth intrusion auxiliary device, which aims to achieve good orthodontic results and be stable and controllable.

[0009] 1. The objective of this invention is achieved through the following technical solution: a posterior implant-supported anterior tooth intrusion aid, characterized in that it comprises two implants and an intrusion arch, wherein the two implants correspond to the spaces between the roots of the second premolar and the first molar on the left and right buccal sides, or between the roots of the first molar and the second molar; the left and right ends of the intrusion arch are rotatably connected to the left and right implants, respectively, and the intrusion arch is arc-shaped with its front end corresponding to the gingival aspect of the anterior teeth. The implants are provided with circumferential grooves, and the ends of the intrusion arch are sequentially bypassed by the cusp, distal, and gingival aspects of the implants.

[0010] A posterior implant-supported anterior intrusion orthodontic device includes the aforementioned anterior intrusion auxiliary device and a main archwire, wherein the front end of the intrusion auxiliary archwire is ligated to the main archwire.

[0011] A method for applying force using the aforementioned posterior implant-supported anterior tooth intrusion aid includes the following steps:

[0012] Step (1) Fix the two implants between the roots of the second premolar and the first molar on the left and right cheek sides, respectively;

[0013] Step (2) The left and right ends of the depressor arch are connected to the implant by wrapping around the circumferential groove on the implant about once from the left and right implants, from the ulnar side to the gingival side. The front part of the depressor arch forms an arch shape corresponding to the anterior gingival side, and the front end of the depressor arch is ligated to the main archwire so that the depressor arch's depressor rebound force is transmitted to the main archwire.

[0014] Step (3) Adjust the circumference and angle of the two ends of the lowering bow around the implant nail to adjust the rebound force and the direction of the rebound force of the lowering bow; adjust the tightness of the ligation between the lowering bow and the main bow wire to adjust the magnitude of the lowering force on the main bow wire.

[0015] 2. The objective of this invention is achieved through the following technical solution: a posterior implant-supported anterior tooth intrusion aid, characterized in that it comprises two implants and an intrusion arch, wherein the two implants correspond to the spaces between the roots of the second premolar and the first molar on the left and right buccal sides, or between the roots of the first molar and the second molar; the left and right ends of the intrusion arch are rotatably connected to the left and right implants, the intrusion arch is arch-shaped and the left and right sides of the intrusion arch are provided with bends towards the gingival direction at the distal end corresponding to the left and right canines, and the front end of the intrusion arch curves upward towards the anterior gingival direction and corresponds to the anterior gingival direction. The implants are provided with circumferential grooves, and the end of the intrusion arch passes sequentially around the implant from the gingival direction, distally, to the gingival direction.

[0016] A posterior implant-supported anterior intrusion orthodontic device includes the aforementioned anterior intrusion auxiliary device and a main archwire, wherein the front end of the intrusion auxiliary archwire is ligated to the main archwire.

[0017] A method for applying force using the aforementioned posterior implant-supported anterior tooth intrusion aid device, characterized by comprising the following steps:

[0018] Step (1) Fix the two implants between the roots of the second premolar and the first molar on the left and right cheek sides, respectively;

[0019] Step (2) The left and right ends of the depressor arch are connected to the implant by wrapping around the circumferential groove on the implant about once from the ulnar and distal sides of the left and right implants to the gingival side. The front part of the depressor arch forms an arch shape and corresponds to the anterior gingival side. The left and right sides of the depressor arch are provided with bends towards the ulnar side at the distal part of the left and right canines, so that the front end of the depressor arch is curved upward towards the anterior gingival side.

[0020] Step (3) Ligate the front end of the depressor bow to the corrective main bow wire so that the depressor bow's depressor rebound force is transmitted to the main bow wire;

[0021] Step (4) Adjust the circumference and angle of the two ends of the lowering bow around the implant nail and / or adjust the bending angle and bending point on the left and right sides of the lowering bow to adjust the rebound force and the direction of the rebound force of the lowering bow; adjust the tightness of the ligation between the lowering bow and the main bow wire to adjust the magnitude of the lowering force on the main bow wire.

[0022] 3. The objective of this invention is achieved through the following technical solution: a posterior implant-supported anterior tooth intrusion aid, characterized in that: it includes two implants and an intrusion arch, wherein the two implants correspond to the spaces between the roots of the second premolar and the first molar on the left and right buccal sides, or between the roots of the first molar and the second molar; the left and right ends of the intrusion arch are fixedly connected to the left and right implants, the front part of the intrusion arch is in the shape of a dental arch and extends horizontally forward, and the front end of the intrusion arch corresponds to the anterior gingiva or vestibule.

[0023] The two ends of the lowering auxiliary bow are respectively bonded to the left and right implant nails, or the implant nails are provided with radial through holes, and the two ends of the lowering auxiliary bow pass through the radial through holes on the left and right implant nails and then bend in the right direction to form a fixed connection with the implant nails.

[0024] A posterior implant-supported anterior intrusion orthodontic device includes the aforementioned anterior intrusion auxiliary device and a main archwire, wherein the front end of the intrusion auxiliary archwire is ligated to the main archwire or connected by a rubber chain.

[0025] A method for applying force using the aforementioned posterior implant-supported anterior tooth intrusion aid includes the following steps:

[0026] Step (1) Fix the two implants between the roots of the second premolar and the first molar on the left and right cheek sides, respectively;

[0027] Step (2) Fix the left and right ends of the depressor arch to the left and right implants respectively. The front part of the depressor arch forms a dental arch arc and extends horizontally forward. The front end of the depressor arch corresponds to the gingiva or vestibule of the anterior teeth. The front end of the depressor arch is connected to the main archwire with a rubber chain or ligature wire so that the depressor arch's depressor rebound force is transmitted to the main archwire.

[0028] Step (3) Adjust the tightness of the ligation between the auxiliary bow and the main bow wire to adjust the magnitude of the pressure on the main bow wire.

[0029] 4. Application of posterior implant post in anterior tooth intrusion aids. Beneficial effects

[0030] 1. The posterior implant-supported anterior tooth intrusion aid device of this invention uses posterior implants as anchorage to provide support force for anterior tooth intrusion. During the force application process, it has virtually no additional impact on the posterior teeth, generating only a pure anterior tooth intrusion force. The intrusion effect is stable and controllable, reducing the occurrence of side effects. Furthermore, due to similar mechanical properties, it can be used to replace anterior anchorage screws for anterior tooth intrusion, avoiding the damage caused by additional anchorage screw placement.

[0031] 2. In the first and second schemes of this invention, the two ends of the depressor arch are arranged to pass around the implant from the lateral side to the distal side and then to the gingival side, and to cover the lateral side of the implant, which is conducive to the mechanical transmission of the supporting force. Moreover, the two ends of the depressor arch can rotate around the left and right implants to a certain extent, thereby adjusting the tensile force of the depressor arch and the direction of the applied force. This achieves flexible and stable adjustment of the anterior tooth depressor force and achieves better orthodontic results by adjusting the force in smaller units.

[0032] 3. The device of the present invention can provide a very flexible force value, which can be adjusted in a timely manner according to clinical progress, and can achieve a certain degree of personalized use; it is convenient and flexible to use, the mechanical loading is efficient and controllable, the force value can be adjusted in a wide range and can be steplessly adjusted, which can greatly improve the treatment efficiency.

[0033] 4. The posterior implant-supported anterior intrusion aid of this invention is an accessory independent of the main archwire. After connecting to the posterior implant, the intrusion aid can be directly applied to the gingival region of the main archwire, applying force through the elastic connection in the anterior region. Therefore, the only contact point between the intrusion aid and the main archwire is the force application point in the anterior region. The remaining parts, supported by the posterior implant, remain completely free and gingivally above the main archwire, without any contact, and will not interfere with the main archwire. Therefore, it will not hinder normal orthodontic tooth movement.

[0034] 5. This invention provides a new application for posterior implants, using them as anchorage for anterior tooth indentation. First, it can stably and reliably provide anterior tooth indentation force; second, it can avoid the risks of root damage, alveolar bone perforation, traumatic ulcers, and inflammation that may occur when implant anchorage is placed in the anterior tooth area; third, it can avoid the risk of posterior tooth elongation caused by using the main archwire as anchorage (patent CN202821676U), which leads to loss of facial plane control in high-angle patients, resulting in facial deterioration, and posterior tooth interference causing joint problems. It can also avoid the risk of interfering with the closure of extraction spaces during orthodontic treatment. This invention improves treatment efficiency. Attached Figure Description

[0035] Figure 1 This is a simplified structural diagram of the lowering auxiliary bow in Example 1;

[0036] Figure 2 This is a schematic diagram illustrating the application of the posterior implant-supported anterior tooth intrusion aid device in Example 1.

[0037] Figure 3 This is a diagram showing the force on the anterior teeth when the anterior tooth depressor auxiliary device is applied in Example 1;

[0038] Figure 4 This is a simplified structural diagram of the lowering auxiliary bow in Example 2;

[0039] Figure 5 This is a schematic diagram illustrating the application of the posterior implant-supported anterior tooth intrusion aid in Example 2.

[0040] Figure 6 This is a diagram showing the force on the anterior teeth when the anterior tooth depressor auxiliary device is applied in Example 2;

[0041] Figure 7 This is a simplified structural diagram of the lowering auxiliary bow in Example 3;

[0042] Figure 8 This is a schematic diagram illustrating the application of the posterior implant-supported anterior tooth intrusion aid device in Example 3.

[0043] Figure 9 This is a diagram showing the force on the anterior teeth when the anterior tooth depressor auxiliary device is applied in Example 3. Detailed Implementation

[0044] The embodiments of this application are described in detail below, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application. Rather, the embodiments of this application include all variations, modifications, and equivalents falling within the spirit and scope of the appended claims.

[0045] Example 1: As Figure 1-3 As shown, this embodiment provides a posterior implant-supported anterior tooth intrusion aid, including two implants 1 and an intrusion arch 2. The two implants correspond to the spaces between the roots of the second premolar and the first molar on the left and right buccal sides, respectively. The left and right ends of the intrusion arch are rotatably connected to the left and right implants, respectively. The intrusion arch is arch-shaped, with its front end corresponding to the gingival aspect of the anterior teeth. In this embodiment, the implants are provided with circumferential grooves. The ends of the intrusion arch are rotatably connected to the implants by sequentially wrapping around the implants from the lateral, distal, and gingival sides. During the wrapping process, small loops 21 naturally form at the tail ends of the intrusion arch.

[0046] The embodiment also provides a posterior implant-supported anterior tooth depressor, including the above-mentioned anterior tooth depressor auxiliary device and a main archwire, wherein the front end of the depressor auxiliary archwire is ligated to the main archwire.

[0047] This embodiment also provides a force application method using the above-mentioned posterior implant-supported anterior tooth intrusion aid / orthodontic appliance, including the following steps:

[0048] Step (1) Fix the two implants between the roots of the second premolar and the first molar on the left and right cheek sides, respectively;

[0049] Step (2) The left and right ends of the depressor arch are connected to the implant by wrapping around the circumferential groove on the implant about once from the left and right implants, from the ulnar side to the gingival side. The front part of the depressor arch forms an arch shape corresponding to the anterior gingival side. The front end of the depressor arch is ligated to the main archwire 3 using ligature wire 4 so that the depressor arch's depressor rebound force is transmitted to the main archwire.

[0050] Step (3) Adjust the circumference and angle of the two ends of the lowering bow around the implant nail to adjust the rebound force and the direction of the rebound force of the lowering bow; adjust the tightness of the ligation between the lowering bow and the main bow wire to adjust the magnitude of the lowering force on the main bow wire.

[0051] In this embodiment, the length of the depressor is moderate so that it can slide and fit against the gingival side of the anterior tooth crown, and there is a certain longitudinal gap between the front end of the depressor and the main orthodontic archwire.

[0052] The posterior implant-supported anterior tooth intrusion device of this embodiment uses posterior implants as anchorage to provide support for anterior tooth intrusion. During the force application process, it has minimal additional impact on the posterior teeth, generating only a pure anterior tooth intrusion force. The intrusion effect is stable and controllable, reducing the occurrence of side effects. Furthermore, due to its similar mechanical properties, it can be used to replace anterior anchorage screws for anterior tooth intrusion, avoiding the damage caused by additional anchorage screw placement.

[0053] Furthermore, the indentation arch is designed to bypass the implant from the far side and distal to the gingival side, covering the far side of the implant. This facilitates the mechanical transmission of the implant support force. Additionally, the indentation arch can rotate to a certain extent around the left and right implants, allowing adjustment of the tension and direction of the force. This enables flexible and stable adjustment of the anterior indentation force, achieving better orthodontic results with smaller force adjustments.

[0054] The device in this embodiment provides a highly flexible force value that can be adjusted in a timely manner according to clinical progress, enabling a certain degree of personalized use. It is convenient and flexible to use, with efficient and controllable mechanical loading, a large adjustable range of force value, and stepless adjustment capability, which can greatly improve treatment efficiency.

[0055] In this embodiment, the posterior implant-supported anterior intrusion device is an accessory independent of the main archwire. After connecting to the posterior implant, the intrusion device is directly applied to the gingival region of the main archwire, applying force through the elastic connection in the anterior region. Therefore, the only point of contact between the intrusion device and the main archwire is the force application point in the anterior region. The remaining parts, supported by the posterior implant, remain completely free and gingivally above the main archwire, without any contact, and thus do not interfere with the main archwire. Therefore, it does not obstruct normal orthodontic tooth movement.

[0056] This embodiment also provides a new application for posterior implants, using them as anchorage for anterior tooth intrusion. Firstly, it can stably and reliably provide anterior tooth intrusion force. Secondly, it avoids the risks of root damage, alveolar bone perforation, traumatic ulcers, and inflammation that may occur with implant anchorage in the anterior region. Thirdly, it avoids the risk of posterior tooth elongation caused by using the main archwire as anchorage (patent CN202821676U), which can lead to loss of facial plane control in high-angle patients, resulting in facial deterioration, and posterior tooth interference causing articular processes. It also avoids the risk of interfering with the closure of extraction spaces during orthodontic treatment. This invention improves treatment efficiency.

[0057] Example 2: As Figure 4-6As shown, this embodiment provides a posterior implant-supported anterior tooth intrusion aid, including two implants 1 and an intrusion arch 2. The two implants correspond to the spaces between the roots of the second premolar and the first molar on the left and right buccal sides, respectively. The left and right ends of the intrusion arch are rotatably connected to the left and right implants. The front of the intrusion arch is arch-shaped, and the left and right sides of the intrusion arch have bends 22 facing the gingival direction at the distal end corresponding to the left and right canines. The front end of the intrusion arch curves upwards towards the anterior gingival direction and corresponds to the anterior gingival direction. The implants have circumferential grooves, and the ends of the intrusion arch sequentially wrap around the implants from the gingival and distal sides to the gingival direction, achieving a rotatable connection. During the wrapping process, small loops 21 naturally form at the tail ends of the intrusion arch.

[0058] The embodiment also provides a posterior implant-supported anterior tooth depressor, including the above-mentioned anterior tooth depressor auxiliary device and a main archwire, wherein the front end of the depressor auxiliary archwire is ligated to the main archwire.

[0059] This embodiment also utilizes the force application method of the above-mentioned posterior implant-supported anterior tooth intrusion aid / orthodontic device, including the following steps:

[0060] Step (1) Fix the two implants between the roots of the second premolar and the first molar on the left and right cheek sides, respectively;

[0061] Step (2) The left and right ends of the depressor arch are connected to the implant by wrapping around the circumferential groove on the implant about once from the ulnar and distal sides of the left and right implants to the gingival side. The front part of the depressor arch is in the shape of a dental arch and corresponds to the anterior gingival side. The left and right sides of the depressor arch are provided with bends towards the ulnar side at the distal part of the left and right canines, so that the front end of the depressor arch is curved upward towards the anterior gingival side.

[0062] Step (3) Ligate the front end of the depressor bow to the main bow wire 3 with the ligature wire 4 so that the depressor bow's depressor rebound force is transmitted to the main bow wire.

[0063] Step (4) Adjust the circumference and angle of the two ends of the lowering bow around the implant nail and / or adjust the bending angle and the position of the bending point on the left and right sides of the lowering bow (near-middle adjustment or far-middle adjustment) to adjust the rebound force of the lowering bow and the direction of the rebound force; adjust the tightness of the ligation between the lowering bow and the main bow wire to adjust the magnitude of the lowering force on the main bow wire.

[0064] The posterior implant-supported anterior tooth intrusion device of this embodiment uses posterior implants as anchorage to provide support for anterior tooth intrusion. During the force application process, it has minimal additional impact on the posterior teeth, generating only a pure anterior tooth intrusion force. The intrusion effect is stable and controllable, reducing the occurrence of side effects. Furthermore, due to its similar mechanical properties, it can be used to replace anterior anchorage screws for anterior tooth intrusion, avoiding the damage caused by additional anchorage screw placement.

[0065] Furthermore, the indentation arch is designed to pass around the implant from the far side, distal to the gingival side, and cover the far side of the implant, thus facilitating the mechanical transmission of the implant support force. Additionally, the two ends of the indentation arch can rotate to a certain extent around the left and right implants, allowing adjustment of the tension force and the direction of the applied force. This enables flexible and stable adjustment of the anterior tooth indentation force, achieving better orthodontic results with smaller force adjustments.

[0066] The device in this embodiment provides a highly flexible force value that can be adjusted in a timely manner according to clinical progress, enabling a certain degree of personalized use. It is convenient and flexible to use, with efficient and controllable mechanical loading, a large adjustable range of force value, and stepless adjustment capability, which can greatly improve treatment efficiency.

[0067] In this embodiment, the posterior implant-supported anterior intrusion device is an accessory independent of the main archwire. After connecting to the posterior implant, the intrusion device is directly applied to the gingival region of the main archwire, applying force through the elastic connection in the anterior region. Therefore, the only point of contact between the intrusion device and the main archwire is the force application point in the anterior region. The remaining parts, supported by the posterior implant, remain completely free and gingivally above the main archwire, without any contact, and thus do not interfere with the main archwire. Therefore, it does not obstruct normal orthodontic tooth movement.

[0068] This embodiment also provides a new application for posterior implants, using them as anchorage for anterior tooth intrusion. Firstly, it can stably and reliably provide anterior tooth intrusion force. Secondly, it avoids the risks of root damage, alveolar bone perforation, traumatic ulcers, and inflammation that may occur with implant anchorage in the anterior region. Thirdly, it avoids the risk of posterior tooth elongation caused by using the main archwire as anchorage (patent CN202821676U), which can lead to loss of facial plane control in high-angle patients, resulting in facial deterioration, and posterior tooth interference causing articular processes. It also avoids the risk of interfering with the closure of extraction spaces during orthodontic treatment. This invention improves treatment efficiency.

[0069] Example 3: As Figure 7-9As shown, this embodiment provides a posterior implant-supported anterior tooth intrusion aid, including two implants 1 and an intrusion arch 2. The two implants correspond to the spaces between the roots of the second premolar and the first molar on the left and right buccal sides, respectively, or between the roots of the first molar and the second molar. The left and right ends of the intrusion arch are fixedly connected to the left and right implants, respectively. The front part of the intrusion arch is in the shape of a dental arch and extends horizontally forward. The front end of the intrusion arch corresponds to the anterior gingiva or vestibule.

[0070] In this embodiment, the two ends of the lowering auxiliary bow are respectively bonded to the left and right implant nails with resin, or the implant nails are provided with radial through holes (horizontally), and the two ends of the lowering auxiliary bow pass through the radial through holes on the left and right implant nails and then bend in the 𬌗 direction to form a fixed connection with the implant nails.

[0071] A posterior implant-supported anterior intrusion orthodontic device includes the aforementioned anterior intrusion auxiliary device and a main archwire, wherein the front end of the intrusion auxiliary archwire is ligated to the main archwire or connected by a rubber chain.

[0072] This embodiment also provides a force application method using the above-mentioned posterior implant-supported anterior tooth intrusion aid / orthodontic appliance, including the following steps:

[0073] Step (1) Fix the two implants between the roots of the second premolar and the first molar on the left and right cheek sides, respectively;

[0074] Step (2) Fix the left and right ends of the depressor arch to the left and right implants respectively. The front part of the depressor arch forms a dental arch arc and extends horizontally forward. The front end of the depressor arch corresponds to the gingiva or vestibule of the anterior teeth. The front end of the depressor arch is connected to the main archwire 3 by a rubber chain 5 or ligature wire so that the depressor arch's depressor rebound force is transmitted to the main archwire.

[0075] Step (3) Adjust the tightness of the ligation between the auxiliary bow and the main bow wire to adjust the magnitude of the pressure on the main bow wire.

[0076] The posterior implant-supported anterior tooth intrusion device of this embodiment uses posterior implants as anchorage to provide support for anterior tooth intrusion. During the force application process, it has minimal additional impact on the posterior teeth, generating only a pure anterior tooth intrusion force. The intrusion effect is stable and controllable, reducing the occurrence of side effects. Furthermore, due to its similar mechanical properties, it can be used to replace anterior anchorage screws for anterior tooth intrusion, avoiding the damage caused by additional anchorage screw placement.

[0077] The device in this embodiment provides a highly flexible force value that can be adjusted in a timely manner according to clinical progress, enabling a certain degree of personalized use. It is convenient and flexible to use, with efficient and controllable mechanical loading, a large adjustable range of force value, and stepless adjustment capability, which can greatly improve treatment efficiency.

[0078] In this embodiment, the posterior implant-supported anterior intrusion device is an accessory independent of the main archwire. After connecting to the posterior implant, the intrusion device is directly applied to the gingival region of the main archwire, applying force through the elastic connection in the anterior region. Therefore, the only point of contact between the intrusion device and the main archwire is the force application point in the anterior region. The remaining parts, supported by the posterior implant, remain completely free and gingivally above the main archwire, without any contact, and thus do not interfere with the main archwire. Therefore, it does not obstruct normal orthodontic tooth movement.

[0079] This embodiment also provides a new application for posterior implants, using them as anchorage for anterior tooth intrusion. Firstly, it can stably and reliably provide anterior tooth intrusion force. Secondly, it avoids the risks of root damage, alveolar bone perforation, traumatic ulcers, and inflammation that may occur with implant anchorage in the anterior region. Thirdly, it avoids the risk of posterior tooth elongation caused by using the main archwire as anchorage (patent CN202821676U), which can lead to loss of facial plane control in high-angle patients, resulting in facial deterioration, and posterior tooth interference causing articular processes. It also avoids the risk of interfering with the closure of extraction spaces during orthodontic treatment. This invention improves treatment efficiency.

[0080] In addition, the anterior tooth intrusion assist device in this embodiment is more continuous and stable during the force application process, and the intrusion assist arch will not shift during the orthodontic treatment.

Claims

1. A posterior implant-supported anterior tooth intrusion aid, characterized in that: The device includes two implants and an indentation arch. The two implants correspond to the roots of the first and second molars on the left and right buccal sides, respectively. The left and right ends of the indentation arch are rotatably connected to the left and right implants, respectively. The indentation arch is arch-shaped and its front end corresponds to the anterior gingival side. The implants are provided with circumferential grooves. The end of the indentation arch passes around the implants sequentially from the ulnar, distal, and gingival sides. The front end of the indentation arch is ligated to the main archwire so that the indentation rebound force of the indentation arch is transmitted to the main archwire. Adjust the circumference and angle of the two ends of the lowering bow around the implant nail to adjust the rebound force and direction of the rebound force of the lowering bow; adjust the tightness of the ligation between the lowering bow and the main bow wire to adjust the magnitude of the lowering force on the main bow wire.

2. A posterior implant-supported anterior tooth intrusion aid, characterized in that: The device includes two implants and an indentation arch. The two implants correspond to the roots of the first and second molars on the left and right buccal sides, respectively. The left and right ends of the indentation arch are rotatably connected to the left and right implants, respectively. The indentation arch is arch-shaped, and its left and right sides are bent towards the gingival direction at the distal end of the left and right canines. The front end of the indentation arch curves upward towards the anterior gingival direction and corresponds to the anterior gingival direction. The implants have circumferential grooves, and the end of the indentation arch passes around the implants sequentially from the gingival, distal, and gingival directions. The front end of the indentation arch is ligated to the main archwire so that the indentation rebound force of the indentation arch is transmitted to the main archwire. Adjust the circumference and angle of the two ends of the lowering bow around the implant nail and / or adjust the bending angle and bending point on the left and right sides of the lowering bow to adjust the rebound force and the direction of the rebound force of the lowering bow; adjust the tightness of the ligation between the lowering bow and the main bow wire to adjust the magnitude of the lowering force on the main bow wire.

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