A kind of invisible orthodontic device for tooth rotation

Abstract

The present application relates to a kind of invisible orthodontic device for tooth rotation, including by several sequentially connected dental mouthguard unit consisting of invisible orthodontic mouthguard and fixed on target tooth spiral protruding attachment, the dental mouthguard unit is provided with the accommodation cavity for accommodating tooth, the accommodation cavity inner wall of the corresponding dental mouthguard unit of target tooth is equipped with the spiral groove matched with spiral protruding attachment;In the process of wearing invisible orthodontic mouthguard along the axial direction of tooth, by the inclined surface between the abutment of spiral protruding attachment and spiral groove, axial wearing force is converted into the circumferential torque acting on the crown of target tooth, to drive tooth to rotate around its long axis, while in the occlusion of patient, occlusion force pushes invisible orthodontic mouthguard, so that the spiral groove and spiral protruding attachment that cooperate each other produce greater torsional force to target tooth.

Description

Technical Field

[0001] This invention relates to an invisible orthodontic device for tooth rotation, belonging to the field of orthodontic technology. Background Technology

[0002] Invisible braces are a device that achieves tooth movement by constantly changing different braces; however, conventional braces only wrap around the teeth through the sidewalls and apply corrective force to the teeth by the deformation of the material. When tooth rotation correction is required, conventional braces can only apply torsional force to the teeth through friction after wrapping around the teeth through the sidewalls. This corrective force is relatively small, and the teeth and braces are prone to slipping, causing relative displacement, which makes the corrective force disappear and the corrective effect unstable.

[0003] Therefore, conventional braces are difficult and inefficient for correcting tooth rotation. Summary of the Invention

[0004] In order to solve the problems existing in the prior art, the present invention provides an invisible orthodontic device that provides a stable torsional corrective force by setting a torsion spiral.

[0005] To achieve the above objectives, the technical solution proposed by this invention is as follows: an invisible orthodontic device for tooth rotation, comprising an invisible orthodontic aligner composed of several sequentially connected aligner units and a spiral protrusion attachment fixed to the target tooth. Each aligner unit has a receiving cavity for accommodating the tooth, and the inner wall of the receiving cavity of the aligner unit corresponding to the target tooth has a spiral groove that cooperates with the spiral protrusion attachment. The cooperating spiral groove and spiral protrusion attachment generate a torsional force on the target tooth, causing the target tooth to rotate along its long axis. During biting, the biting force generates a superimposed torsional force on the target tooth through the cooperating spiral groove and spiral protrusion attachment.

[0006] A further design of the above technical solution is as follows: the spiral protrusion attachment includes several arranged along the circumference of the target tooth, and the spiral groove is arranged in a one-to-one correspondence with the spiral protrusion attachment.

[0007] Several spiral protrusions are positioned on the labial and lingual sides of the target tooth.

[0008] The spiral protrusion attachments are arranged in pairs, and the two spiral protrusion attachments in a pair are symmetrically arranged along the rotation axis of the target tooth.

[0009] Several spiral protrusions are evenly distributed along the circumference of the target tooth.

[0010] The cross-section of the spiral protrusion attachment is quadrilateral or semi-circular.

[0011] The outer surface of the spiral protrusion attachment away from the tooth is arc-shaped.

[0012] The beneficial effects of this invention are as follows: This invention forms a torsional helical pair by setting a helical protrusion attachment on the target tooth and setting a helical groove on the corresponding aligner unit of the invisible aligner to cooperate with the helical protrusion attachment. During the process of the invisible aligner being put in along the tooth axis, the inclined surface between the helical protrusion attachment and the helical groove abuts, which converts the axial insertion force into a circumferential torsional force acting on the crown of the target tooth, thereby driving the tooth to rotate around its long axis.

[0013] Once the invisible aligners are fully in place, the grooves on the aligners and the protrusions on the teeth will lock together tightly and maintain a certain elastic compression, thereby generating a continuous and stable normal torsional force on the teeth and improving the orthodontic efficiency.

[0014] At the same time, when patients wear this orthodontic force-adding device, the vertical force of the upper and lower teeth clenching during daily eating or biting will be further pressed downwards onto the braces. Through the mechanical transmission of the inclined plane of the torsional helical pair, each biting force is converted into a torsional force that rotates the teeth. This torsional force is superimposed with the torsional force generated under normal conditions to form a greater force, which greatly improves the orthodontic efficiency of rotated teeth. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the invisible orthodontic device in conjunction with teeth according to Embodiment 1 of the present invention; Figure 2 This is a top view of the invisible orthodontic device in conjunction with teeth according to Embodiment 1 of the present invention; Figure 3 This is a schematic diagram of the spiral protrusion attachment and the target tooth in Example 1; Figure 4 This is a top sectional view of the invisible orthodontic aligners in conjunction with the target teeth in Example 2; Figure 5 for Figure 4 Schematic diagram of the target tooth and spiral protrusion attachment; Figure 6 for Figure 4 A top sectional view of a clear aligner; Figure 7 This is a schematic diagram of the insertion process of the invisible orthodontic device in Example 3; Figure 8 This is a schematic diagram illustrating the interaction between the invisible aligners and the target teeth in Example 3. Figure 9 for Figure 8 Top view; In the diagram: 1-Invisible aligners, 2-Aligner unit, 3-Cavity, 4-Spiral protrusion attachment, 5-Spiral groove, 6-Target tooth. Detailed Implementation

[0016] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments. Example 1

[0017] like Figure 1 and Figure 2 The diagram shows the invisible orthodontic aligner 1 of this embodiment for tooth rotation being worn on a patient's dental model. The invisible orthodontic force application device includes an invisible orthodontic aligner 1 composed of several aligner units 2 connected in sequence and a spiral protrusion attachment fixed to the target tooth 6. The aligner unit 2 is provided with a receiving cavity for accommodating the tooth. The inner wall of the receiving cavity of the aligner unit 2 corresponding to the target tooth 6 is provided with a spiral groove that cooperates with the spiral protrusion attachment. The mutually cooperating spiral groove and spiral protrusion attachment generate a circumferential torsional force on the target tooth.

[0018] Combination Figure 3 As shown, this is a patient's tooth model. The target tooth 6 has several spiral protrusions arranged around its circumference. In this embodiment, there are three spiral protrusions 4. The spiral protrusions 4 are located on the buccal and lingual sides and mesial and distal sides of the tooth. The three spiral protrusions 4 are evenly distributed along the axial direction of the target tooth. There are also three corresponding spiral grooves, which are arranged one-to-one with the spiral protrusions. The evenly distributed spiral protrusions 4 can stabilize the generated torsional force and ensure that the target tooth rotates along its long axis as much as possible, making it less prone to tilting.

[0019] During the insertion of the invisible aligner 1 along the target tooth 6, the helical pair formed by the helical protrusion attachment and the helical groove converts the axial insertion force into a circumferential torque acting on the crown, thereby driving the target tooth 6 to rotate around its long axis. At the same time, when the aligner is fully in place, under normal conditions, the groove on the aligner and the protrusion on the tooth will tightly lock together and maintain a certain elastic compression, thereby generating a continuous torsional force on the tooth. Furthermore, when the patient chews food or bites on a chewable toy, the vertical force of the upper and lower teeth clenching will further press on the aligner. Through the helical ramp of the helical pair, the tooth rotation and movement that is difficult and inefficient in traditional invisible orthodontics is transformed into a precisely controllable mechanical transmission process. Each biting force is converted into a circumferential force that rotates the tooth, and this force is superimposed with the torsional force under normal conditions to form a greater orthodontic force, which greatly improves the predictability and efficiency of rotational orthodontics.

[0020] In this embodiment, the cross-section of the spiral protrusion attachment 4 is quadrilateral, trapezoidal in this embodiment, and may also be rectangular or other shapes. The width of the spiral protrusion attachment 4 on the side closer to the target tooth is smaller than the width on the side farther from the target tooth. The outer surface of the spiral protrusion attachment 4 is arc-shaped, so that the spiral protrusion attachment and the spiral groove can achieve self-locking after they are engaged. This can effectively prevent the axial slippage of the orthodontic aligner caused by torque, ensure that the orthodontic force is fully expressed and will not fall off, and make the generated torsional force more stable. Example 2

[0021] The invisible orthodontic device in this embodiment is basically the same as that in Embodiment 1, except that because the gap between the target tooth and the adjacent teeth is small, it is not possible to set spiral protrusion attachments on the mesial and distal sides of the teeth. Figure 4 As shown, in this embodiment, the spiral protrusion attachment 4 on the target tooth is only provided on the labial and lingual sides, and there are four spiral protrusion attachments 4. The four spiral protrusion attachments are arranged in pairs, and the pairs of spiral protrusion attachments 4 are symmetrically arranged along the rotation axis of the target tooth, as shown. Figure 5 As shown, the paired symmetrical spiral protrusions also ensure uniform torsional force, guaranteeing that the target tooth rotates along its long axis as much as possible; correspondingly, the spiral grooves 5 on the inner wall of the cavity 3 of the aligner unit 2 corresponding to the target tooth in the invisible aligner 1 are also located on the labial and lingual sides, as shown. Figure 6 As shown.

[0022] In this embodiment, the invisible orthodontic force-adding device is manufactured by first designing symmetrical positive spiral protrusion attachments on both sides of a predetermined rotation axis on a digital model of the teeth. Then, an interference or micro-interference fit spiral groove is generated at the corresponding position on the digital model of the orthodontic aligner. The invisible orthodontic aligner is then formed by 3D printing / molding. The spiral protrusion attachments are formed by 3D printing and are bonded to the teeth during use. Example 3

[0023] The invisible orthodontic device in this embodiment is basically the same as that in Embodiment 2, except that the arc-shaped spiral protrusion attachment 4, which is set on the target tooth, is only set on the labial and lingual sides, and there are two pairs of spiral protrusion attachments 4, which are symmetrically arranged along the rotation axis of the target tooth. Figure 8 As shown; the spiral grooves 5 on the inner wall of the cavity 3 of the corresponding aligner unit 2 in the invisible aligner 1, which corresponds to the target tooth, are also located on the labial and lingual sides, as shown. Figure 9 As shown.

[0024] like Figure 7As shown, during the process of the invisible orthodontic aligner 1 being inserted along the axial direction of the target tooth 6, the spiral protrusion attachment 4 is inserted into the spiral groove, which converts the axial insertion force into a circumferential torque acting on the crown, thereby driving the target tooth 6 to rotate around its long axis; at the same time, when the aligner is fully in place, the groove on the aligner and the protrusion on the tooth will be tightly locked together and maintain a certain elastic compression, thereby generating a continuous rotational thrust on the tooth.

[0025] In this embodiment, the spiral protrusion attachment 4 is set as a semi-cylindrical shape with a semi-circular cross-section. Furthermore, by setting parameters such as the helix angle, tooth profile, pitch, and number of threads, the torque required for rotation can be controlled to achieve gentle force application.

[0026] The technical solutions of the present invention are not limited to the above embodiments. All technical solutions obtained by equivalent substitution fall within the scope of protection claimed by the present invention.

Claims

1. An invisible orthodontic appliance for tooth rotation, characterized in that: The device includes an invisible orthodontic aligner composed of several sequentially connected aligner units and a spiral protrusion attachment fixed to the target tooth. Each aligner unit has a receiving cavity for accommodating the tooth, and the inner wall of the receiving cavity of the aligner unit corresponding to the target tooth has a spiral groove that mates with the spiral protrusion attachment. The interlocking spiral groove and spiral protrusion attachment generate a torsional force on the target tooth, causing the target tooth to rotate along its long axis. During biting, the biting force generates a superimposed torsional force on the target tooth through the interlocking spiral groove and spiral protrusion attachment.

2. The invisible orthodontic device for tooth rotation according to claim 1, characterized in that: The spiral protrusion attachment includes several arranged along the circumference of the target tooth, and the spiral groove is arranged in a one-to-one correspondence with the spiral protrusion attachment.

3. The invisible orthodontic device for tooth rotation according to claim 2, characterized in that: Several spiral protrusions are positioned on the labial and lingual sides of the target tooth.

4. The invisible orthodontic device for tooth rotation according to claim 3, characterized in that: The spiral protrusion attachments are arranged in pairs, and the two spiral protrusion attachments in a pair are symmetrically arranged along the rotation axis of the target tooth.

5. The invisible orthodontic device for tooth rotation according to claim 3, characterized in that: Several spiral protrusions are evenly distributed along the circumference of the target tooth.

6. The invisible orthodontic device for tooth rotation according to any one of claims 1 to 5, characterized in that: The cross-section of the spiral protrusion attachment is quadrilateral or semi-circular.

7. The invisible orthodontic device for tooth rotation according to claim 6, characterized in that: The outer surface of the spiral protrusion attachment away from the tooth is arc-shaped.

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