A device for correcting the position of the upper front teeth

Abstract

The application discloses a kind of whole translation correcting device of maxillary anterior teeth, it includes the connecting body being connected with target anterior teeth, the force transmission arm extending to the palate of the two ends of connecting body, the guide rod being fixedly connected with force transmission arm, the U-shaped frame being fixedly connected with palate and the positioning tube being fixedly connected with the two ends of U-shaped frame.The traction hook is provided on the force transmission arm, the hanging part is provided on the U-shaped frame, and the force applying member is connected between the two;The guide rod is provided in the positioning tube and is slidably connected with it.The core is that the axial center line of guide rod and positioning tube is parallel to maxillary occlusal plane and maxillary dentition sagittal section;The distance from the line connecting traction force action part on traction hook and hanging part to maxillary occlusal plane is equal to the distance from the impedance center of target anterior teeth whole translation to maxillary occlusal plane.The technical scheme can ensure that the correction force passes through the impedance center, so as to realize the pure whole translation of anterior teeth, effectively prevent inclination and left-right rotation, and the limiting structure for preventing excessive backward movement of teeth is provided, so as to improve the controllability and safety of treatment.

Description

Technical Field

[0001] This invention relates to the field of orthodontic technology, specifically to a driving device for the overall translation of maxillary anterior teeth. Background Technology

[0002] In orthodontic treatment, the overall translation of the maxillary anterior teeth is a common treatment requirement, especially in cases involving tooth extraction when retracting the anterior teeth. Traditional orthodontic appliances often fail to achieve the desired overall translation effect when pulling on the maxillary anterior teeth.

[0003] According to the biomechanical principles of orthodontics, the way teeth move mainly depends on the positional relationship between the point of application of the orthodontic force and the center of resistance of the tooth. When the force passes through the center of resistance of the tooth, the tooth moves as a whole (translation); conversely, it moves at an angle. The location of the center of resistance of the maxillary anterior teeth is affected by various factors such as root morphology and the state of periodontal supporting tissues, and is usually located on the long axis of the root about 2 / 5 of the root length from the alveolar ridge crest.

[0004] Several devices have been developed in the prior art to address this problem. For example, CN121242751A discloses a device for palatal root control movement of maxillary anterior teeth, which guides the orthodontic force to act below the center of tooth resistance through a traction arm and traction ring. Another patent, "Orthodontic Traction Hook and Orthodontic Device for Moving Teeth as a Whole" (CN 203468765 U), uses a stepped traction hook to bring the point of application of the traction force close to the center of resistance of the target tooth. However, these devices still have the following shortcomings:

[0005] Inaccurate control of the force application point height: Existing devices have difficulty accurately adjusting the force application point to a position equal to the impedance center height of the overall translation of the maxillary anterior teeth, which may cause the teeth to rotate or tilt during the movement.

[0006] Lack of effective restraint mechanism: Existing devices lack mechanical restraint structures to prevent excessive forward movement of teeth, relying entirely on the doctor's experience and regular check-ups, which poses treatment risks. Summary of the Invention

[0007] In view of this, the present invention provides a maxillary anterior teeth translational orthodontic device to solve the technical problems of ensuring that the anterior teeth only undergo translational movement without rotation or tilting during the overall traction of the anterior teeth, and to prevent excessive forward movement.

[0008] The maxillary anterior teeth translational orthodontic device of the present invention includes a connector for connecting to each target anterior tooth, a force transmission arm fixed to both ends of the connector and extending towards the palate, a guide rod fixed to the force transmission arm, a U-shaped frame for fixed connection with the palate, and a positioning tube fixed to both ends of the U-shaped frame. The force transmission arm is provided with a traction hook for connecting a force-applying component, and the U-shaped frame is provided with a hook for connecting a force-applying component. The distance from the line connecting the traction hook and the traction force application part on the hook to the maxillary occlusal plane is equal to the distance from the impedance center of the overall translation of the target anterior tooth to the maxillary occlusal plane. The guide rod passes through the positioning tube and slides with the positioning tube. The axial center lines of the guide rod and the positioning tube are parallel to the maxillary occlusal plane and the sagittal section of the maxillary dentition.

[0009] Furthermore, the connector includes a crossbar and an adhesive seat fixed to the crossbar for bonding with the target anterior tooth.

[0010] Furthermore, the guide rod is also provided with a limiting part for limiting the maximum distance of overall movement of the target anterior teeth.

[0011] Furthermore, the U-shaped frame consists of a base with screw connection holes and curved arms connected to both sides of the base. The U-shaped frame is fixedly connected to the palate by screws.

[0012] Furthermore, the maxillary anterior teeth overall translational orthodontic device also includes a force-applying component, which is a rubber band or a tension spring.

[0013] Furthermore, the guide rod is also provided with scale lines for measuring the overall translational distance of the target anterior teeth.

[0014] Furthermore, the impedance center of the overall translation of the target anterior tooth is obtained by the following method:

[0015] 1) Construct a three-dimensional digital model consisting of the target anterior tooth as a whole, the periodontal ligament, and the alveolar bone, and import the three-dimensional digital model into the finite element software;

[0016] 2) Establish a three-dimensional rectangular coordinate system with the origin O as the midpoint of the line connecting the vertices of the mesial incisal angles of the left and right maxillary central incisors in the target anterior tooth system:

[0017] Z-axis: The average direction of the unit vector of the major axis of each tooth of the target anterior tooth, with the positive direction pointing to the root.

[0018] X-axis: Perpendicular to the Z-axis and the sagittal section of the maxillary dentition, pointing positively to the left side of the dentition;

[0019] Y-axis: perpendicular to the XOZ plane, with the positive direction pointing towards the palatal side of the upper anterior teeth;

[0020] 3) Apply torques around the X-axis, Y-axis, and Z-axis to the target anterior tooth, causing it to rotate around the central axis that passes through the impedance center and is parallel to the corresponding coordinate axis. Obtain the displacement data of each finite element node of the target anterior tooth after rotation under the action of torques in different directions through finite element analysis.

[0021] 4) Select finite element nodes whose displacement is less than a set threshold under the action of couples around the X-axis, Y-axis and Z-axis respectively, and then obtain the finite element node set for each couple, and find the intersection of the three finite element node sets.

[0022] 5) Perform three-dimensional spatial sphere fitting on the finite element nodes in the intersection, and the coordinates of the center of the fitted sphere are the impedance center of the overall translation of the target anterior tooth.

[0023] The beneficial effects of this invention are:

[0024] 1. This invention relates to a maxillary anterior teeth translational orthodontic device. By precisely designing the height of the line connecting the traction hook and the traction force application part to the maxillary occlusal plane to be equal to the height of the impedance center of the target anterior teeth's overall translational movement to the occlusal plane, it ensures that the line of action of the traction force passes through the impedance center, causing the teeth to undergo pure translational movement and avoiding vertical tilting. Furthermore, the traction direction is limited by the sliding cooperation of the left and right guide rods and the positioning tube, ensuring that the anterior teeth are translated in the set direction, avoiding horizontal rotation. This solves the technical problem of traditional orthodontic devices failing to achieve true overall movement.

[0025] 2. The maxillary anterior teeth overall translational orthodontic device of the present invention is set at the upper limit of the guide rod. When it contacts the end of the positioning tube, it can automatically stop traction, effectively preventing excessive forward movement of teeth and improving the safety and controllability of treatment.

[0026] 3. The maxillary anterior teeth integral translation orthodontic device of this invention has a reasonable structure and is convenient for clinical installation and adjustment. Doctors can design the force of the applying components and the position of the limiting part according to the patient's specific situation, achieving personalized treatment. Attached Figure Description

[0027] Figure 1 This is a three-dimensional structural diagram of a maxillary anterior teeth translational orthodontic appliance. Detailed Implementation

[0028] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0029] like Figure 1As shown, the maxillary anterior teeth overall translation orthodontic device in this embodiment includes a connector 1 for connecting to each target anterior tooth, a force transmission arm 2 fixed to both ends of the connector and extending towards the upper palate, a guide rod 3 fixed to the force transmission arm, a U-shaped frame 4 for fixed connection to the upper palate, and a positioning tube 5 fixed to both ends of the U-shaped frame. The force transmission arm is provided with a traction hook 6 for connecting the force application element, and the U-shaped frame is provided with a hooking part 7 for connecting the force application element. In this embodiment, the hooking part 7 is a connecting post with a hooking groove and an anti-dislodgement head, and the distance from the line connecting the traction hook and the traction force application part on the hooking part to the maxillary occlusal plane is equal to the distance from the impedance center of the overall translation of the target anterior tooth to the maxillary occlusal plane. The guide rod passes through the positioning tube and slides within it. The axial center lines of the guide rod and the positioning tube are simultaneously parallel to the maxillary occlusal plane and the sagittal section of the maxillary dentition.

[0030] In this embodiment, the connector 1 includes a crossbar 101 and an adhesive base 102 fixed to the crossbar for bonding with the target anterior teeth. In this embodiment, the connector 1 can be conveniently and reliably connected to each target anterior tooth as a whole.

[0031] In this embodiment, the U-shaped frame 4 consists of a base 411 with screw connection holes and curved arms 412 connected to both sides of the base. The U-shaped frame is fixedly connected to the palate by screws. The U-shaped frame 4 is easy to install and reliably fixed.

[0032] In this embodiment, the maxillary anterior teeth translational orthodontic device precisely designs the height of the line connecting the traction hook and the traction force application part to the maxillary occlusal plane to be equal to the height of the impedance center of the target anterior teeth's overall translation to the occlusal plane. This ensures that the line of action of the traction force passes through the impedance center, causing the teeth to produce a pure translational movement and avoiding vertical tilting. Furthermore, the traction direction is limited by the sliding cooperation of the left and right guide rods and the positioning tube, ensuring that the anterior teeth are translated in the set direction and avoiding horizontal rotation. This solves the technical problem that traditional orthodontic devices cannot achieve true overall movement.

[0033] As an improvement to the above embodiment, the guide rod 3 is further provided with a limiting part 8 for limiting the maximum distance of overall movement of the target anterior tooth. Specifically, the limiting part 8 can be a ring, fixed to the guide rod by means of integral printing, bonding, welding, etc. When the limiting part moves to the end of the contact positioning tube, it can automatically stop traction, effectively preventing excessive forward movement of the tooth and improving the safety and controllability of the treatment.

[0034] As an improvement to the above embodiment, the maxillary anterior teeth translational orthodontic device further includes a force-applying element 9, which is a rubber band or a tension spring.

[0035] As an improvement to the above embodiment, the guide rod 3 is also provided with a scale line 10 for measuring the overall translational distance of the target anterior tooth. The scale line 10 allows doctors to more conveniently and accurately know the overall movement of the anterior teeth.

[0036] As an improvement to the above embodiment, the impedance center of the overall translation of the target anterior tooth is obtained by the following method:

[0037] 1) Construct a three-dimensional digital model consisting of the target anterior tooth as a whole, the periodontal ligament, and the alveolar bone, and import the three-dimensional digital model into the finite element software.

[0038] 2) Establish a three-dimensional rectangular coordinate system with the origin O as the midpoint of the line connecting the vertices of the mesial incisal angles of the left and right maxillary central incisors in the target anterior tooth system:

[0039] Z-axis: The average direction of the unit vector of the major axis of each tooth of the target anterior tooth, with the positive direction pointing to the root.

[0040] X-axis: Perpendicular to the Z-axis and the sagittal section of the maxillary dentition, pointing positively to the left side of the dentition;

[0041] Y-axis: perpendicular to the XOZ plane, with the positive direction pointing towards the palatal side of the upper anterior teeth.

[0042] 3) Apply torques around the X-axis, Y-axis, and Z-axis to the target anterior tooth, causing it to rotate around a central axis that passes through the impedance center and is parallel to the corresponding coordinate axis. Obtain the displacement data of each finite element node of the target anterior tooth after rotation under the action of torques in different directions through finite element analysis.

[0043] 4) Select finite element nodes whose displacement is less than a set threshold under the action of couples around the X-axis, Y-axis and Z-axis respectively, and then obtain the finite element node set corresponding to each couple, and find the intersection of the three finite element node sets.

[0044] 5) Perform three-dimensional spatial sphere fitting on the finite element nodes in the intersection, and the coordinates of the center of the fitted sphere are the impedance center of the overall translation of the target anterior tooth.

[0045] Finally, it should be noted that 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 preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A maxillary anterior teeth integral translation orthodontic appliance, characterized in that: The device includes a connector for connecting to each target anterior tooth, force transmission arms fixed to both ends of the connector and extending towards the upper palate, a guide rod fixed to the force transmission arm, a U-shaped frame for fixed connection to the upper palate, and positioning tubes fixed to both ends of the U-shaped frame. The force transmission arm is provided with a traction hook for connecting a force-applying component, and the U-shaped frame is provided with a hook for connecting a force-applying component. The distance from the line connecting the traction hook and the traction force application part on the hook to the maxillary occlusal plane is equal to the distance from the impedance center of the overall translation of the target anterior tooth to the maxillary occlusal plane. The guide rod passes through the positioning tube and slides with the positioning tube. The axial center lines of the guide rod and the positioning tube are parallel to the maxillary occlusal plane and the sagittal section of the maxillary dentition.

2. The maxillary anterior teeth integral translation orthodontic device according to claim 1, characterized in that: The connector includes a crossbar and an adhesive seat fixed to the crossbar for bonding with the target anterior tooth.

3. The maxillary anterior teeth integral translation orthodontic device according to claim 1, characterized in that: The guide rod is also provided with a limiting part for limiting the maximum distance of overall movement of the target anterior teeth.

4. The maxillary anterior teeth integral translation orthodontic device according to claim 1, characterized in that: The U-shaped frame consists of a base with screw connection holes and curved arms connected to both sides of the base. The U-shaped frame is fixedly connected to the palate by screws.

5. The maxillary anterior teeth integral translation orthodontic device according to claim 1, characterized in that: It also includes a force-applying component, which is a rubber band or a tension spring.

6. The maxillary anterior teeth integral translation orthodontic device according to claim 1, characterized in that: The guide rod is also equipped with scale lines for measuring the overall translational distance of the target anterior teeth.

7. The maxillary anterior teeth integral translation orthodontic appliance according to any one of claims 1-6, characterized in that: The impedance center for the overall translation of the target anterior tooth is obtained by the following method: 1) Construct a three-dimensional digital model consisting of the target anterior tooth as a whole, the periodontal ligament, and the alveolar bone, and import the three-dimensional digital model into the finite element software; 2) Establish a three-dimensional rectangular coordinate system with the origin O as the midpoint of the line connecting the vertices of the mesial incisal angles of the left and right maxillary central incisors in the target anterior tooth system: Z-axis: The average direction of the unit vector of the major axis of each tooth of the target anterior tooth, with the positive direction pointing to the root. X-axis: Perpendicular to the Z-axis and the sagittal section of the maxillary dentition, pointing positively to the left side of the dentition; Y-axis: Perpendicular to the XOZ plane, with the positive direction pointing towards the palatal side of the upper anterior teeth; 3) Apply torques around the X-axis, Y-axis, and Z-axis to the target anterior tooth, causing it to rotate around the central axis that passes through the impedance center and is parallel to the corresponding coordinate axis. Obtain the displacement data of each finite element node of the target anterior tooth after rotation under the action of torques in different directions through finite element analysis. 4) Select finite element nodes whose displacement is less than a set threshold under the action of couples around the X-axis, Y-axis and Z-axis respectively, and then obtain the finite element node set for each couple, and find the intersection of the three finite element node sets. 5) Perform three-dimensional spatial sphere fitting on the finite element nodes in the intersection, and the coordinates of the center of the fitted sphere are the impedance center of the overall translation of the target anterior tooth.

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