Shell dental instrument system and its traction structure design method

Abstract

The present application provides a shell-shaped dental instrument system, comprising N shell-shaped dental instruments, N is greater than 2. The shell-shaped dental instrument comprises a shell-shaped body which is integrated shell-shaped and forms a cavity for accommodating teeth, and further comprises a traction structure connected to the shell-shaped body, the spatial position of which remains substantially unchanged in the absolute position in M-step shell-shaped dental instruments, M is less than or equal to N, for providing an effective stable traction system.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of medical devices, in particular to a shell-shaped dental device system and a design method of a traction structure thereof. BACKGROUND

[0002] Due to the advantages of aesthetics, convenience and easy cleaning, shell-shaped dental devices (such as invisible aligners and retainers) based on polymer materials are becoming more and more popular.

[0003] When shell-shaped dental devices are used for orthodontic treatment and orthognathic treatment, pure shell-shaped dental devices sometimes cannot provide sufficient treatment force, and often need to rely on traction structures and / or special structures to provide additional treatment force for moving teeth.

[0004] For example, when shell-shaped dental devices are used for orthodontic treatment, a rubber band is sometimes suspended by traction structures such as traction buckles, traction hooks, and lingual buckles, but as the treatment progresses, the teeth at the suspension point of the rubber band will move. If the position of the traction structure is repositioned with the moved teeth as a reference, the force value and angle generated by the new suspension system will change relatively, and the traction force value and direction cannot be effectively fixed.

[0005] In view of the above, it is necessary to provide a new shell-shaped dental device system and a design method of a traction structure thereof, so as to provide a stable traction system. SUMMARY

[0006] One aspect of the present application provides a shell-shaped dental device system, comprising N shell-shaped dental devices, N being greater than 2, characterized in that each shell-shaped dental device further comprises: a shell-shaped body, which is an integral shell-shaped body and forms a cavity for accommodating teeth; and a traction structure connected to the shell-shaped body, the spatial position of which remains substantially unchanged in M-step shell-shaped dental devices.

[0007] In some embodiments, the cavity has a geometry for repositioning the patient's teeth from a first arrangement to a second arrangement. The geometry of the cavity is determined based on the second arrangement of the patient's teeth. And the geometry of the cavity substantially matches the second arrangement of the patient's teeth.

[0008] In some embodiments, the connection is achieved by adhesion, welding or integral molding to fix the traction structure on the shell-shaped body. At this time, the traction structure and the shell-shaped body are connected and cannot be disassembled. Further, the integral molding can be film pressing molding or 3D printing molding.

[0009] In some embodiments, the M-step shell-shaped dental device is at least a 2-step shell-shaped dental device. And the 2-step shell-shaped dental device has different geometries corresponding to at least one tooth.

[0010] In some embodiments, the absolute position is a position defined in a global coordinate system, which does not change with tooth movement. The global coordinate can be determined based on facial shape, or based on gingival shape, or based on initial position of dental arch related morphology.

[0011] In some embodiments, the substantially unchanging position is a position in which the geometric center of the traction hook moves less than 3 mm in the global coordinate system.

[0012] Further, the geometric center of the traction hook moves less than 0.5 mm in the global coordinate system.

[0013] Further, the geometric center of the traction hook moves less than 0.5 mm in the global coordinate system.

[0014] Further, the geometric center of the traction hook moves less than 0.5 mm in the global coordinate system.

[0015] Another aspect of the present application also provides a method for designing a traction structure, specifically comprising: first, generating a first position of the traction structure in the Kth treatment step according to a design scheme; second, recording the position information of the first position of the traction structure in the global coordinate system; third, mapping the position information of the first position of the traction structure to the K+1th treatment step when designing the K+1th treatment step; fourth, K = K+1, and repeating the third step until the completion of the treatment in this stage.

[0016] In some embodiments, the first position of the traction structure is the first position of the traction structure itself, or the first position of the traction structure base. Further, the traction structure is integrally formed on the shell-shaped body, and the first position of the traction structure is the first position of the traction structure itself; or the traction structure is connected together by the traction structure base on the shell-shaped body through adhesion, welding, or detachable connection, and the first position of the traction structure is the first position of the traction structure base connected to the traction structure.

[0017] In some embodiments, the design scheme is a tooth movement scheme, i.e., a scheme for moving at least one tooth from one position or angle to another position or angle.

[0018] In some embodiments, the mapping is to approximately assign the position information of the first position of the traction structure in the global coordinate system to the position of the traction structure in the K+1th treatment step. Further, the approximate assignment is that the spatial absolute deviation between the assigned position and the first position is within 3 mm, preferably within 0.5 mm.

[0019] In some implementations, the staged correction is a staged correction with the same traction structure design. Attached Figure Description

[0020] The above and other features of this application will be further described below with reference to the accompanying drawings and their detailed description. It should be understood that these drawings only illustrate several exemplary embodiments according to this application and should not be considered as limiting the scope of protection of this application. Unless otherwise specified, the drawings are not necessarily to scale, and similar reference numerals denote similar parts.

[0021] Figure 1 A schematic diagram of a shell-shaped dental instrument provided by the present invention;

[0022] Figure 2 The anatomical definitions of the sagittal and horizontal planes;

[0023] Figure 3 This is a schematic diagram of a shell-shaped dental instrument system in the prior art.

[0024] Figure 4 This is a schematic diagram of a shell-shaped dental instrument system provided by the present invention;

[0025] Figure 5 A comparison diagram of the forces acting on teeth in the vertical direction between the existing system and the shell-shaped dental instrument system provided by the present invention;

[0026] Figure 6 A flowchart of a traction structure design method provided by the present invention. Detailed Implementation

[0027] The following detailed description incorporates the accompanying drawings, which form part of this specification. The illustrative embodiments mentioned in the specification and drawings are for illustrative purposes only and are not intended to limit the scope of this application. Those skilled in the art will understand, based on the teachings of this application, that many other embodiments can be employed and various changes can be made to the described embodiments without departing from the spirit and scope of this application. It should be understood that the various aspects of this application illustrated herein can be arranged, substituted, combined, separated, and designed in many different configurations, all of which are within the scope of this application.

[0028] Through extensive research and development, the inventors of this application have developed a novel shell-shaped dental instrument capable of detachably mounting a traction structure.

[0029] like Figure 1 As shown, a shell-shaped dental instrument 100 according to one embodiment of this application is schematically illustrated.

[0030] A shell-shaped dental appliance 100, comprising a shell-shaped body 110, and a traction structure 120.

[0031] The shell-shaped body 110 is an integral shell-shaped and forms a cavity accommodating teeth, the cavity has a geometry to reposition the patient's teeth from a first layout to a second layout, the geometry of the cavity is determined based on the second layout of the patient's teeth, and substantially coincides with the second layout of the patient's teeth.

[0032] The traction structure 120 is connected to the shell-shaped body 110, and the spatial position of the traction structure 120 remains substantially unchanged in the absolute position in the multi-step shell-shaped dental appliance.

[0033] In some embodiments, the connection is to fix the traction structure 120 on the shell-shaped body 110 by bonding, welding or integral molding. Preferably, the traction structure 120 and the shell-shaped body 110 are not detachable after being connected. Further, the integral molding can be film molding or 3D printing molding.

[0034] In some embodiments, the multi-step shell-shaped dental appliance is a two-step shell-shaped dental appliance. And the two-step shell-shaped dental appliance has different design amounts for at least one same tooth.

[0035] In some embodiments, in some embodiments, the absolute position is defined in a global coordinate system that does not change with tooth movement. The global coordinate system can be determined based on the surface shape, or based on the gum, or based on the initial position of the dental arch.

[0036] In some embodiments, the substantially unchanged position is that the geometric center of the traction hook moves less than 3mm in the global coordinate system.

[0037] Further, the geometric center of the traction hook moves less than 0.5mm in the global coordinate system.

[0038] Further, the geometric center of the traction hook moves less than 0.5mm in the global coordinate system.

[0039] Further, the geometric center of the traction hook moves less than 0.5mm in the global coordinate system.

[0040] As Figure 2 shown, the sagittal plane and the horizontal plane are anatomical terms. The left and right planes are the sagittal plane, which divides the human body into left and right parts. The horizontal plane divides the human body into upper and lower parts.

[0041] As Figure 3Fig. 1 schematically illustrates a shell-shaped dental appliance system 200 according to an embodiment of the present application.

[0042] The system 200 according to the embodiment comprises three steps of treatment S1, S2, S3, and three sets of shell-shaped dental appliances, each set of shell-shaped dental appliances comprising one shell-shaped dental appliance for the upper jaw and one shell-shaped dental appliance for the lower jaw.

[0043] The system 200 according to the embodiment simulates distal movement of the upper canine. An opening 201 is provided at the upper canine, and a traction structure 202 is provided at the lower second molar. The opening 201 and the traction structure 202 are connected by an elastic body 203.

[0044] The elastic body 203 can be a rubber band, a push spring, a pull spring, or any other elastic object. The elastic body 203 can also be a combination of a rubber band, a push spring, and a pull spring. The elastic body 203 is detachably mounted on the opening 201 and the traction structure 202, and is used to provide the orthodontic treatment force.

[0045] During the distal movement of the canine, the opening 201 moves with the canine, but the traction structure 202 at the lower second molar remains substantially stationary, i.e., the distance of movement is less than 1 mm. During the distal movement of the canine, the angle between the elastic body 203 and the occlusal plane changes due to the change in the position of the opening 201, which results in a change in the force on the upper canine and the lower second molar in the vertical direction. Furthermore, the force on the upper canine and the lower second molar in the vertical direction becomes larger and larger, which produces an undesirable extraction effect.

[0046] As shown in Fig. 1, Figure 4 Fig. 1 schematically illustrates a shell-shaped dental appliance system 300 according to an embodiment of the present application.

[0047] The system 300 according to the embodiment also comprises three steps of treatment S1, S2, S3, and three sets of shell-shaped dental appliances, each set of shell-shaped dental appliances comprising one shell-shaped dental appliance for the upper jaw and one shell-shaped dental appliance for the lower jaw, and simulates distal movement of the upper canine. The difference between the system 300 and the system 200 according to the embodiment is that the shell-shaped dental appliances of the system 300 all adopt the traction structure 320, and the position of the traction structure 320 remains substantially stationary in the global coordinate system, i.e., does not move with the movement of the upper canine.

[0048] In the embodiment, although the canine has moved distally, the traction structure 320 of the shell-shaped dental appliances on the upper jaw and the lower jaw has not moved relatively, so the elastic body 330 connected to the traction structure 320 has not changed substantially, and the force on the upper canine and the lower second molar in the vertical direction has not changed.

[0049] As shown in Fig. 1, Figure 5As shown, the present application compares the existing shell-shaped dental appliance system 200 and the shell-shaped dental appliance system 300 provided by the present application, the angle change of the elastomer with the occlusal plane and the vertical force on the second molar of the mandible at different stages. As can be seen from the figure, the shell-shaped dental appliance system 300 provided by the present application can better control the vertical force on the teeth during the treatment process, that is, the vertical force on the teeth is basically unchanged.

[0050] In some embodiments, the dental appliance system provided by the present application can also be a single jaw cooperating implant pin for traction. The position of the traction structure on the single jaw is basically unchanged.

[0051] As Figure 6 As shown, another aspect of the present application also provides a traction structure design method, and the specific steps are as follows:

[0052] S101, the first step, according to the design scheme, generate the first position of the accessory traction structure in the Kth treatment step;

[0053] S102, the second step, record the position information of the first position of the accessory traction structure in the global coordinate system;

[0054] S103, the third step, when designing the K+1th treatment step, map the position information of the first position of the accessory traction structure to the K+1th treatment step;

[0055] S104, the fourth step, K=K+1, repeat the third step until the completion of the treatment in this stage.

[0056] In some embodiments, the first position of the traction structure is the first position of the geometric center of the traction structure, and further, the traction structure is integrally molded on the shell-shaped body.

[0057] In some embodiments, the first position of the traction structure is the first position of the geometric center of the traction structure docking base, and further, the traction structure docking base is a connecting table molded on the shell-shaped body, and the traction structure is bonded, welded or detachably connected together with the traction structure through the connecting table on the shell-shaped body.

[0058] In some embodiments, the design scheme is a tooth movement scheme, that is, a scheme for moving at least one tooth from one position or angle to another position or angle.

[0059] In some embodiments, the mapping is to approximately assign the position information of the first position of the accessory traction structure in the global coordinate to the position of the accessory traction structure in the K+1th treatment step. Further, the absolute spatial deviation between the assigned position and the first position is within 3mm, preferably within 0.5mm.

[0060] In some embodiments, the stages of the treatment are stages of treatment having the same accessory traction structure design.

[0061] Although aspects and embodiments of the present application are disclosed herein, other aspects and embodiments in accordance with the present application will be apparent to individuals skilled in the art from the disclosure herein. The various aspects and embodiments disclosed herein are for purposes of illustration only and are not intended to limit the scope of the present application. The scope of the present application is limited only by the claims that follow.

[0062] Also, each of the various figures can illustrate an exemplary architecture or other configuration of the disclosed methods and systems that facilitate understanding of the features and functionality that can be included in the disclosed methods and systems. The claimed subject matter is not limited to the exemplary architecture or configuration shown, but rather, the desired features can be implemented using a variety of alternative architectures and configurations. In addition, to the extent there are flow diagrams, functional descriptions, and method claims, the order in which the blocks are presented is not necessarily the order in which the blocks are performed, unless explicitly stated otherwise.

[0063] Unless specifically stated otherwise, the terms and phrases used herein are to be construed as open-ended, rather than limiting. Each "step" shell-shaped dental appliance can also be equivalently understood as "a" shell-shaped dental appliance. In some instances, the use of expansive language, such as "one or more," "at least," "but not limited to," or the like, is not to be construed as limiting of the scope of the claims.

Claims

1. A shell-shaped dental instrument system comprising N shell-shaped dental instruments, N being greater than 2, characterized in that, Each shell-shaped dental appliance further comprises: a shell-shaped body being integrally shell-shaped and forming a cavity for accommodating teeth; and a traction structure connected to the shell-shaped body, the spatial position of which remains substantially invariant in absolute position in the M-step shell-shaped dental appliance, where M is greater than 1.

2. The shell-like dental instrument system of claim 1, wherein, The connection is achieved by bonding, welding or integrally forming the traction structure to the shell-shaped body.

3. The shell-like dental instrument system of claim 1, wherein, The M-step shell-shaped dental appliance is at least a 2-step shell-shaped dental appliance, and M is less than or equal to N.

4. The shell-like dental instrument system of claim 3, wherein, The 2-step shell-shaped dental appliance has at least one tooth corresponding to different geometric shapes.

5. The shell-like dental instrument system of claim 1, wherein, The absolute position is defined in a global coordinate system that does not change with tooth movement.

6. The shell-like dental instrument system of claim 1, wherein, The substantially invariant is that the geometric center of the traction hook moves less than 3mm in absolute value in the global coordinate system.

7. The shell-like dental instrument system of claim 6, wherein, The geometric center of the traction hook moves less than 0.5mm in the projection length of the vector in the intersection of the sagittal plane and the horizontal plane in the global coordinate system.

8. The shell-like dental instrument system of claim 6, wherein, The geometric center of the traction hook moves less than 0.5mm in the projection length of the vector in the sagittal plane in the global coordinate system.

9. The shell-like dental instrument system of claim 6, wherein, The geometric center of the traction hook moves less than 0.5mm in absolute value in the global coordinate system.

10. A design method for a traction structure of a shell-shaped dental appliance system, characterized by: Step 1: According to the design scheme, generate the first position of the traction structure in the Kth treatment step; Step 2: Record the position information of the first position of the traction structure in the global coordinate system; Step 3: When designing the K+1th treatment step, map the position information of the first position of the traction structure to the K+1th treatment step; Step 4: K = K+1, repeat Step 3 until the completion of the treatment in this stage.

11. The method of designing a pulling structure of a shell-shaped dental instrument system according to claim 10, wherein The first position of the traction structure is the first position of the traction structure itself or the first position of the traction structure base.

12. The method of designing a pulling structure of a shell-shaped dental instrument system according to claim 10, wherein The design scheme is a tooth movement scheme.

13. The method of designing a pulling structure of a shell-shaped dental instrument system according to claim 10, wherein The mapping is to approximately assign the position information of the first position of the traction structure in the global coordinate system to the position of the traction structure in the K+1th treatment step.

14. The method of designing a pulling structure of a shell-shaped dental instrument system according to claim 13, wherein The spatial absolute deviation between the assigned position and the first position is within 3mm.

15. The method of designing a pulling structure of a shell-shaped dental instrument system according to claim 14, wherein The spatial absolute deviation between the assigned position and the first position is within 0.5mm in the projection length on the intersection of the sagittal plane and the horizontal plane.

16. The method of designing a pulling structure of a shell-shaped dental instrument system according to claim 14, wherein The spatial absolute deviation between the assigned position and the first position is within 0.5mm in the projection length on the sagittal plane.

17. The method of designing a harness for a shell-type dental instrument system of claim 14, wherein, The spatial absolute deviation between the assigned position and the first position is within 0.5mm.

18. The method of designing a pulling structure of a shell-shaped dental instrument system according to claim 10, wherein, The treatment in this stage is the treatment in this stage with the same design scheme of the traction structure.

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