Device for assisting in lowering extension molar by using dental implant and preparation method of device

Abstract

The invention discloses a device for assisting in lowering an elongated molar by using a dental implant and a preparation method thereof, and relates to the field of oral clinics, the device comprises a ring-shaped magnet and a circular magnet, the circular magnet is provided with or not provided with a lowering track, the circular magnet is located on the elongated molar needing to be lowered, and the circular magnet is provided with or not provided with a lowering track. The circular ring-shaped magnet is positioned on the other side opposite to the extended molars needing to be depressed and is parallel to the circular magnet, and the pair of magnets generate repulsive force in the occlusion process; meanwhile, a fixed or movable lowering device is arranged, so that the requirements of doctors on lowering different extension molars in the clinical process are met. According to the invention, the dental implant is used as absolute anchorage, repulsive force between the magnets is used for depressing target teeth, and in the process of depressing molars, the lost chewing function of part of patients due to molars deficiency can be recovered, and the technology is simple, non-invasive, beautiful and comfortable, and has small influence on other teeth.

Description

Technical Field

[0001] The present application relates to the field of oral clinical practice, and specifically discloses a device for assisting in depressing and elongating molars using a dental implant and a preparation method thereof. Background Art

[0002] At present, oral implant technology is very mature, but many patients in clinical practice have long-term tooth loss and need Tooth elongation results in insufficient space for dental crown restoration in the oral cavity. Therefore, a large number of patients need to use orthodontic methods to lower their molars. Orthodontic lowering of molars requires an anchor unit. If you want to move a tooth, there must be another part that receives the opposite force. In this field, the unit that can resist or offset the reaction force of the correction force is called an anchor unit. There are currently two main methods for lowering molars:

[0003] The first is to use implants to lower the molars. The implants here are orthodontic implants, which need to be implanted through outpatient surgery. Generally, two implants are implanted, and the implant positions are the buccal and lingual sides of the elongated molars.

[0004] The disadvantages of this method are that the doctor needs to complete the surgery through outpatient surgery, which has certain risks and will cause trauma to the patient. In addition, there is a risk of failure in the implantation of implant screws, which may fall off for various reasons, and the success rate of implant screws is related to the doctor's operation and the patient's own conditions, which is difficult to predict. Secondly, after the implant screw is implanted, the soft tissue around it will proliferate, making the operation more difficult. Finally, not all patients' conditions allow the implantation of orthodontic implant screws, and a certain amount of space is required.

[0005] The second method is to use a ring-type depressor, which uses several teeth in front and behind the target tooth as anchor teeth to depress the target tooth.

[0006] The disadvantages of this method are: 1. Two traction hooks will extend from the depressed position of this device, and almost all patients will feel uncomfortable after wearing this device, which is manifested as friction between the buccal mucosa and the tongue. Patients need a considerable period of time to adapt to the device. 2. After wearing this device, it is difficult for patients to clean it, affecting oral hygiene. 3. If the depressed tooth position is located in the premolar area, it will affect the patient's aesthetics. Summary of the invention

[0007] The object of the present invention is to provide a device for assisting in depressing and elongating molars using a dental implant and a preparation method thereof, so as to avoid the shortcomings of other molar depressing technologies mentioned in the background art.

[0008] In order to solve the above technical problems, the content of this application is divided into two aspects:

[0009] The first aspect of the present application aims to provide a device for assisting the depression of an elongated molar by using a dental implant, comprising a ring-shaped magnet and a circular magnet, the circular magnet having or not having a depression track, the circular magnet being located on the elongated molar to be depressed, and the plane thereof being perpendicular to the long axis of the tooth; the ring-shaped magnet being located opposite the elongated molar to be depressed And opposite to the circular magnet, the pair of magnets generates repulsive force during the occlusion process; it includes a fixed or movable depression device, the fixed or movable depression device includes an implant, a lower base, and an upper base, the implant is fixed on the jaw opposite to the elongated molar, the lower base and the upper base of the fixed or movable depression device are connected as a whole through a composite base screw, and the circular ring magnet is bonded to the upper surface of the upper base.

[0010] Furthermore, the distance between the circular magnet and the annular magnet of the present invention does not exceed 3 mm.

[0011] Furthermore, the outer ring diameter of the annular magnet is 6-5mm, the inner ring diameter is 4-3mm, and the thickness is 1mm; the diameter of the round magnet is 2-3mm, and the thickness is 1mm.

[0012] Furthermore, the material of the round magnet and the annular magnet is a permanent magnet with a grade of n35.

[0013] Furthermore, it includes a heightening gasket, which is arranged between the lower base and the upper base and is used to raise the circular ring magnet to increase the pressure on the elongated molar.

[0014] Furthermore, the axial directions of the upper and lower parts of the connection between the upper and lower abutments may have a certain angle, which is determined by the implant angle and the The angle is set according to the specific situation of the long axis difference of the teeth, and the angle is between 5°-30°.

[0015] The second aspect of the present application aims to provide a method for preparing the above-mentioned device for assisting in lowering and elongating molars by using a dental implant, comprising the following steps:

[0016] 1) The patient first goes to the implant department to have the implant implanted. After the operation, a digital intraoral scan is performed, and the actual position and angle of the implant are transferred using a scanning rod;

[0017] 2) Design and produce devices using digital software;

[0018] 2.1) Import the patient's occlusal model and CBCT to establish a digital model. Use CAD / CAM software to make the plane of the circular magnet perpendicular to the long axis of the molar, and design the maxillary bonding guide. Set the relative position of the circular magnet. The circular magnet and the circular magnet are designed to make the axes of the two magnets coincide. After determining the positions of the two magnets, the patient's choice is selected. Personalized fixed or removable devices, after 3D printing the upper and lower jaw devices with the magnets vacated, use resin bonding to bond the magnets, and use glass ionomer to bond the device to the molars that need to be depressed;

[0019] 2.2) Import the patient's occlusal model and CBCT to establish a digital model, use CAD / CAM software to make the plane of the circular magnet perpendicular to the long axis of the molar, and design the maxillary bonding guide and maxillary depression track;

[0020] 3) Patients are given devices to wear to depress and lengthen the molars. The patients are reviewed once a month. When the force of the device to depress and lengthen the molars is insufficient, the maxillary device is remade or the gasket is replaced to ensure the depressing force until the molars are depressed to the appropriate position. When there is enough inter-maxillary distance, the maxillary and mandibular devices are removed, the model is taken to make the implant crown, and the implant crown is made and worn.

[0021] Furthermore, the bonding method in step 2.1) is as follows: the circular magnet is bonded to the device by resin bonding, the elongated molar and the depression device are bonded by glass ionomer bonding, the fixed device and the implant are mechanically connected, and the movable device and the implant are connected by overdenture.

[0022] Furthermore, the position of the circular magnet in step 2.1) is determined by observing the crown shape and importing CBCT to establish a model, so that the plane of the circular magnet is perpendicular to the long axis of the tooth and its height is close to the elongated molar. The surface can make the teeth be subjected to the repulsive force of the magnet along the long axis of the tooth, and the elongated teeth will be pressed down along the direction of the long axis of the tooth.

[0023] Furthermore, the present invention selects different types of magnet designs based on the evaluation of the patient's molar depression target position and the patient's molar morphology; the molar depression target position is to depress the molar heel surface to the opposing gingival surface 5-8mm.

[0024] The bonding guide plate and the device on the elongated molar side, and the fixed or movable depression device on the opposite side of the elongated molar are designed and manufactured using CAD / CAM software; the bonding guide plate and the device on the elongated molar side, and the fixed device on the opposite side of the elongated molar are 3D printed resin, and the movable device on the opposite side of the elongated molar is manufactured by cobalt-nickel alloy metal cutting.

[0025] The technical effect of the present invention is: the device utilizes dental implants as absolute support, utilizes the repulsive force between circular magnets and annular magnets, and designs personalized and non-personalized depression devices to depress the target teeth. In the process of depressing the molars, it can restore the chewing function lost by some patients due to missing molars. The technology is simple and non-invasive, beautiful and comfortable, and has little impact on other teeth. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 This is a schematic diagram of a maxillary device according to an embodiment of the present invention.

[0027] Figure 2 This is a schematic diagram of a maxillary device according to another embodiment of the present invention.

[0028] Figure 3 It is a schematic diagram of the mandibular device of the present invention.

[0029] Figure 4 It is a schematic diagram of the composition of the mandibular device of the present invention.

[0030] Figure 5 A schematic diagram of adding a gasket to the mandibular device of the present invention.

[0031] Figure 6 Schematic diagram of the personalized lower abutment of the present invention.

[0032] Figure 7 Schematic diagram of the overall position of the ring magnet and the circular magnet device worn by the patient.

[0033] Figure 8 Schematic diagram of the patient's occlusal status after wearing it.

[0034] In the figure: 1. bonding guide; 2. fixed or movable depression device; 3. annular magnet; 4. circular magnet; 5. elongated molar; 6. implant; 7. lower abutment; 8. upper abutment; 9. composite abutment screw; 10. raising gasket; 11. depression track; 12. shoulder.

[0035] 101. Upper jaw; 102. Lower jaw. DETAILED DESCRIPTION

[0036] The technical solution of the present invention is further described below in conjunction with the accompanying drawings.

[0037] In the following embodiments of the present invention, the example of lowering the maxillary elongated molars is used for explanation, so as to facilitate a better understanding of the technical solution of the present invention. The examples in the following embodiments, the names of the maxillary devices, mandibular devices, etc., are also used to facilitate the connection of the technical solution of the present invention. This expression is not a limitation on the specific elongated molar position, or is only used for the depression of specific elongated molars, nor is it used to limit the scope of protection of the present invention. The maxillary device described in the present invention is used in the example of the maxilla, and similarly, it can also be used to lower the mandibular elongated molars. The use of directional terms such as upper and lower is just more convenient when describing specific embodiments.

[0038] See attached Figure 1-3The device provided by the present invention for assisting the depression of an elongated molar by using a dental implant comprises a bonding guide plate 1, a fixed or movable depression device 2 and a pair of magnets; the pair of magnets comprises a circular ring magnet 3 and a circular magnet 4 matched with the circular ring magnet 3. As an embodiment of the present invention, the circular magnet 4 is bonded to the bonding guide plate 1 to form an upper jaw device, which is located on the elongated molar 5 to be depressed, and its plane is perpendicular to the long axis of the tooth; the fixed or movable depression device 2 is bonded to the circular ring magnet 3 to form a lower jaw device, which is located opposite the elongated molar 5 to be depressed. On the jawbone, and corresponding to the circular magnet 4, the pair of magnets generates a repulsive force during the biting process.

[0039] See attached Figure 2 As another embodiment of the present invention, the present invention includes a depression track 11, a circular magnet 4 and a bonding guide plate 1 located on the elongated molar 5 to be depressed, with its plane perpendicular to the long axis of the tooth, and the depression track 11 is bonded at the same time, so that they together constitute a maxillary device.

[0040] The outer ring diameter of the circular ring magnet 3 of the present invention is 7-6mm, the inner ring diameter is 4-3mm, and the thickness is 1mm; the diameter of the circular magnet 4 is 2-3mm, and the thickness is 1mm. In a specific implementation, different types of magnet designs are selected according to the evaluation of the patient's molar depression target position (implant biological width 3mm, implant crown 6-7mm) and the patient's molar morphology.

[0041] Specifically, the device of the present invention is used for patients who need dental implant restoration and need to place the Patients with elongated molar intrusion.

[0042] See attached Figure 4 and attached Figure 5The fixed or movable depression device 2 of the present invention includes an implant 6, a lower base 7, and an upper base 8, which are connected as a whole by a composite base screw 9, wherein the implant 6 is fixed on the jawbone opposite to the elongated molar 5, the lower base 7 is a columnar figure with a boss in the middle, the bottom of the upper base 8 is a tubular structure, which is sleeved on the upper part of the boss of the lower base 7, and a circular ring magnet 3 is arranged on the top of the upper base 8. As a further embodiment, the fixed or movable depression device 2 of the present invention also includes a heightening gasket 10. When the distance between the circular magnet 4 and the circular magnet 3 is large, the heightening gasket 10 is arranged between the lower base 7 and the upper base 8 to raise the circular ring magnet 3, shorten the distance between the circular magnet 4 and the circular ring magnet 3, and maintain a continuous force on the elongated molar 5. Specifically, the mandibular upper abutment 8 is taken out by rotating out the composite abutment screw 9, and a 1mm thick annular heightening gasket 10 made of resin material is added. The upper abutment 8 is fixed to the lower abutment 7 by the composite abutment screw 9, and the distance between the two pairs of magnets is reduced to ensure the subsequent depressing force value. The position and occlusal state of the patient after wearing the annular magnet and the circular magnet are shown in the attached figure. Figure 7 and Figure 8 shown.

[0043] In the present invention, the bonding guide plate 1, the maxillary device, and the fixed or movable depression device 2 are designed and manufactured using CAD / CAM software; the bonding guide plate 1, the maxillary device, and the mandibular device are 3D printed resins, and the mandibular movable device is manufactured by metal cutting of cobalt-nickel alloy.

[0044] The following is a detailed description of the preparation method of the device for lowering the elongated molars using dental implants to assist in lowering the elongated molars by taking the example of lowering the elongated molars of the maxillary jaw as an example:

[0045] 1) The patient first goes to the implant department to have the implant implanted. After the operation, an oral scan is performed and the actual position and angle of the implant are transferred using a scanning rod.

[0046] 2) Design and produce devices using digital software;

[0047] 2.1) Import the patient's occlusal model and CBCT to establish a digital model. Use the CAD / CAM software to make the plane of the circular magnet 4 perpendicular to the long axis of the molar, and design the bonding guide 1. Place the circular ring magnet 3 relative to the plane of the circular magnet 4 so that the axes of the two magnets coincide. After determining the position of the magnet, design a personalized fixed or movable mandibular depression device 2 according to the patient's choice. After the upper and lower mandibular devices are 3D printed with the position of the magnet, use resin bonding to bond the magnet, and use glass ion bonding to bond the molar and the device.

[0048] 2.2) Import the patient's occlusal model and CBCT to establish a digital model, use the CAD / CAM software to align the plane of the circular magnet 4 perpendicular to the long axis of the molar, and design the bonding guide 1 and the depression track 11.

[0049] 5) Patients are given devices to wear to depress and lengthen the molars. The patients are referred for follow-up visits once a month. When the force of the device to depress and lengthen the molars is insufficient, the maxillary device is remade or the heightening gasket 10 is replaced to ensure the depressing force until the molars are depressed to a suitable position. When the molars are depressed to the ideal position and there is enough inter-jaw distance, the maxillary and maxillary devices are removed, and a model is taken to make an implant crown, which is then worn.

[0050] The maxillary elongated molar and the maxillary device of the present invention are bonded by glass ionomer bonding, and the mandibular fixing device and the dental implant are mechanically connected by a composite abutment screw 9 .

[0051] Furthermore, in the present invention, in making the patient's dental arch model, the patient's dental arch model can be made by using the impression method or 3D printing technology, digital intraoral scanning technology model, etc. The present invention is not limited to the above examples, and any method in the prior art that can achieve the purpose of the present invention can also be used, and the present invention is not limited.

[0052] In the embodiment of the present invention, the position of the magnet is determined by observing the crown shape and introducing CBCT to establish a model, so that the plane of the circular magnet 4 is perpendicular to the long axis of the tooth body and its height is close to the elongated molar. The surface can make the tooth be subjected to the repulsive force of the magnet along the direction of the long axis of the tooth, and the elongated tooth can be directionally pressed down along the direction of the long axis of the tooth.

[0053] The present invention uses a device for assisting the depressing of an elongated molar by means of a dental implant, by bonding a circular magnet 4 to a maxillary bonding guide plate 1, and bonding the whole to the maxillary elongated molar 5. The fixed or movable depressing device 2 is bonded to the annular magnet 3. In the present invention, the mandibular fixed or movable device is two independent components, wherein the mandibular fixed device is bonded to the annular magnet 3 and then connected to the dental implant by means of mechanical retention. After the mandibular movable device is bonded to the annular magnet 3, it is connected to the dental implant in the form of a covering denture, and the denture as a movable device is connected in a movable manner. In any of the above connection methods, the position of the annular magnet 3 should be opposite to the circular magnet 4, and the distance between the pair of magnets should be adjusted not to exceed 3 mm.

[0054] In an embodiment of the present invention, the material of the annular magnet 3 and the circular magnet 4 is a permanent magnet with a grade of n35. The two magnets will generate a force of 150-250g when they are 1mm apart. The present invention sets the distance between the circular magnet 4 and the annular magnet 3 to no more than 3mm, which can ensure that the repulsive force generated between the two magnets will not cause discomfort to the patient, and the force is sufficient to lower the patient's elongated teeth to an ideal state. The device of the present invention uses the dental implant as absolute support and the repulsive force between the two magnets to lower the target teeth, and in the process of lowering the molars, it can restore the chewing function lost by some patients due to the loss of molars. In addition, the method of the present invention is simple and non-invasive, beautiful and comfortable, and has little impact on other teeth.

[0055] Based on the above description, the device of the present invention includes a pair of interacting annular magnets 3 and circular magnets 4, wherein the circular magnet 4 is connected to the elongated molar through the bonding guide plate 1, and the annular magnet 3 is connected to the fixed or movable depression device 2. Further, a depression track 11 can be provided, which cooperates with the bonding guide plate 1 and is connected to the elongated molar, and is used for personalized or non-personalized patients. The bonding guide plate 1 in the present invention can be circular or cross-shaped, but is not limited to the above shape, wherein the cross shape can better fit the tooth surface and has a better use effect. Specifically, the following three forms are included. First, for the initial stability of the implant is not good enough, the following method is adopted: the upper jaw has only the bonding guide plate 1, and the lower jaw adopts the removable partial denture-covering denture method (the position of the annular magnet of the lower jaw can be controlled), and the force of the implant can be reduced at the same time. With the depression of the target tooth, the bonding guide plate 1 of the upper jaw can be directly replaced to reduce the distance between the pair of magnets. Second, for dental implants, the initial stability is good enough. If the position and angle of the implant are relatively good, the angle of the implant is parallel or nearly parallel to the Long axis of tooth, implant and There will be a slight difference in the long axis of the tooth root in the mesiodistal and buccal-lingual positions. This situation is the majority of non-personalized situations. The following non-personalized method is used: the maxillary uses a bonding guide 1 and a depression track 11, and the mandibular uses a non-personalized fixed depression device. Along with the depression, the mandibular heightening gasket 10 can be replaced to reduce the distance between a pair of magnets, or the maxillary bonding guide 1 can be directly replaced to reduce the distance between a pair of magnets. Third, the initial stability of the dental implant is good enough, and the implant angle and For teeth with large tooth long axis differences, the following personalized methods are used: the upper jaw uses a bonding guide plate 1 and a depression track 11, and the lower jaw uses a personalized fixed depression device. Along with the depression of the target teeth, the distance between the pair of magnets can be reduced by replacing the mandibular heightening gasket 10, or the distance between the pair of magnets can be reduced by directly replacing the bonding guide plate 1 of the upper jaw.

[0056] See attached Figure 6 , the third type of personalized fixing and pressing device of the present invention has the following difference: the upper and lower parts of the shoulder 12 of the boss of the lower base 7 have a certain angle in the axial direction to solve the implant angle and the If the long axis of the teeth is very different, the angle is determined by the implant angle and the The specific setting of the difference in the long axis of the teeth is generally between 5°-30°. For angles less than 5°, a non-personalized fixed depression device can be used to solve the problem.

[0057] The mandibular device of the present invention adopts movable, fixed personalized, and fixed non-personalized designs. For most patients with upper and lower jaws and elongated molar structures, the mandibular device with non-personalized design is used as a general method to meet the needs of most patients. For patients with special upper and lower jaws and elongated molar structures, it is necessary to adopt a personalized design for the patient to achieve the elongated molar depression of the patient. The upper base 8 of the mandibular two-stage base with personalized design and the circular ring magnet 3 are an integral device, and its position is opposite to the circular magnet 4 of the maxilla and is located directly below the circular magnet 4. The upper base 8 of the mandibular two-stage base with non-personalized design and the circular ring magnet 3 are an integral device, and its position is parallel to the circular magnet 4 of the maxilla and is located below the circular magnet 4. The mandibular device with personalized and non-personalized design has the following differences from the corresponding maxillary device: relative to the mandibular device with non-personalized design, the circular magnet 4 and the maxillary bonding guide plate 1 are located on the elongated molar 5 that needs to be depressed, and its plane is perpendicular to the long axis of the tooth, and the maxillary depression track 11 is bonded at the same time. Relative to the mandibular device with personalized design, the circular magnet 4 and the maxillary bonding guide plate 1 are located on the elongated molar 5 that needs to be depressed, and their planes are perpendicular to the long axis of the tooth, completing the overall installation of the device without bonding the maxillary depression track 11. In the present invention, the maxillary bonding guide plate + the maxillary depression track are used for the mandibular device with non-personalized design, and the mandibular device with personalized design only needs to be bonded with the maxillary bonding guide plate 1. The present invention can be applied to elongated molar depression in any situation through the mandibular devices with personalized and non-personalized designs, wherein the non-personalized design satisfies the upper and lower jaw structures for most elongated molar depression, and the personalized design is used to solve special situations that cannot be solved by the mandibular device with non-personalized design, as a supplement to the elongated molar depression with non-personalized design.

[0058] Based on the above description of the present invention, the present invention realizes the depression of the elongated molars through the repulsive force between the circular magnet and the circular ring magnet; the maxillary device and the mandibular device are manufactured by digital design, and act on the elongated molars of the patient to achieve the purpose of the present invention. In order to improve the discomfort of the patient after wearing, the scheme of depressing the elongated molars can be selected according to the specific conditions of the patient's elongated molars and oral cavity, or the surface can be made into a simulated tooth surface shape to improve the patient's adaptability.

[0059] It should be further explained that the present invention is not only used for depressing maxillary elongated molars, but can also be used for depressing mandibular elongated molars. In the specific implementation manner, the depressing of maxillary elongated molars is taken as an example, and directional terms such as maxillary device and mandibular movable device are used. The above terms and the terms such as upper and lower used are only for the convenience of description to facilitate the understanding of the technical solution of the present invention, and are not used to limit the protection scope of the present invention. The present invention is not only used for depressing maxillary elongated molars, but can also be used for depressing mandibular elongated molars. Therefore, any obvious adjustments or improvements made to the technical solution of the present invention that belong to the technical concept of the present invention should fall within the protection scope of the present invention.

Claims

1. A device for assisting the depression and elongation of molars using a dental implant, characterized by: The invention comprises a ring magnet and a circular magnet, wherein the circular magnet has or does not have a depression track, and the circular magnet is located on the elongated molar that needs to be depressed, and its plane is perpendicular to the long axis of the tooth; the ring magnet is located on the elongated molar that needs to be depressed. And opposite to the circular magnet, the pair of magnets generates repulsive force during the occlusion process; it includes a fixed or movable depression device, the fixed or movable depression device includes an implant, a lower base, and an upper base, the implant is located on the jaw opposite to the elongated molar, the lower base and the upper base of the fixed or movable depression device are connected as a whole by screws, and the circular ring magnet is bonded to the upper surface of the upper base.

2. The device for assisting in lowering and elongating molars by using a dental implant according to claim 1, characterized in that: The distance between the circular magnet and the circular ring magnet should not exceed 3 mm.

3. The device for assisting in lowering and elongating molars by using a dental implant according to claim 1, characterized in that: The outer ring diameter of the annular magnet is 6-5mm, the inner ring diameter is 4-3mm, and the thickness is 1mm; the diameter of the round magnet is 2-3mm and the thickness is 1mm.

4. The device for assisting in lowering and elongating molars by using a dental implant according to any one of claims 1 to 3, characterized in that: The material of round magnets and ring magnets is permanent magnet, grade n35.

5. The device for assisting in lowering and elongating molars by using a dental implant according to claim 1, characterized in that: It includes a heightening gasket, which is arranged between the lower base and the upper base and is used to raise the circular ring magnet to increase the pressure on the elongated molar.

6. The device for assisting in lowering and elongating molars by using dental implants according to claim 1, characterized in that: The axial direction of the upper and lower parts of the abutment connection has a certain angle, which is determined by the implant and the The angle between the long axes of the teeth is set between 5° and 30°.

7. A method for preparing a device for assisting in the depression and elongation of molars using a dental implant as claimed in any one of claims 1 to 6, characterized in that The following steps are involved: 1) The patient first goes to the implant department to have the implant implanted. After the operation, a digital intraoral scan is performed, and the actual position and angle of the implant are transferred using a scanning rod; 2) Design and produce the device using digital software; 2.1) Import the patient's occlusal model and CBCT to establish a digital model. Use CAD / CAM software to make the plane of the circular magnet perpendicular to the long axis of the molar to be depressed, and design the bonding guide. The tooth is set with a circular ring magnet so that the axes of the circular magnet and the circular ring magnet coincide. After determining the positions of the two magnets, the design is based on the patient's choice. Personalized fixed or removable devices, leaving space for magnets, 3D printing the upper and lower jaw devices, using resin bonding to bond the magnets, and using glass ionomer to bond the device to the molars that need to be depressed; 2.2) Import the patient's occlusal model and CBCT to establish a digital model, use CAD / CAM software to make the plane of the circular magnet perpendicular to the long axis of the molar to be depressed, and design the depression track; 3) Patients are given devices to wear to depress and lengthen the molars. The patients are reviewed once a month. When the force of the device to depress and lengthen the molars is insufficient, the device on the depressed molars is remade or the gaskets are replaced to ensure the depressing force. After the molars are depressed to the appropriate position and sufficient inter-maxillary distance is obtained, the upper and lower jaw devices are removed, the model is taken, and the implant crown is made and worn.

8. The method for preparing a device for assisting in lowering and elongating molars using a dental implant as claimed in claim 7, characterized in that: The bonding methods in step 2.1) are as follows: the circular magnet is bonded to the device by resin bonding, the elongated molar and the depression device are bonded by glass ionomer bonding, the fixed device and the dental implant are mechanically connected, and the movable device and the dental implant are connected by overdenture.

9. The method for preparing a device for assisting in the depression and elongation of molars using a dental implant as claimed in claim 7, characterized in that: The position of the circular magnet in step 2.1) is determined by observing the crown shape and importing CBCT to establish a model, so that the plane of the circular magnet is perpendicular to the long axis of the tooth, so that the tooth can be subjected to the repulsive force of the magnet along the long axis of the tooth, and the elongated tooth can be directionally depressed along the direction of the long axis of the tooth.

10. The method for preparing a device for assisting in the depression and elongation of molars using a dental implant as claimed in claim 7, characterized in that: According to the patient's molar depression target position and molar morphology, different types of magnet designs are selected; the molar depression target position is to depress the molars. Face to face 5-8mm from the gingival surface.

Images