CN112932698A

CN112932698A - Bracket-free invisible appliance produced based on tooth multi-position overlapping model and manufacturing method thereof

Info

Publication number: CN112932698A
Application number: CN202110144651.8A
Authority: CN
Inventors: 舒广; 戴帆帆
Original assignee: Individual
Current assignee: Individual
Priority date: 2020-07-17
Filing date: 2021-01-28
Publication date: 2021-06-11
Also published as: CN214805563U

Abstract

The invention provides a bracket-free invisible appliance produced on the basis of a tooth model with a plurality of overlapped design positions and a manufacturing method thereof, belonging to the field of invisible appliances in orthodontic technology. The appliance comprises a dental cast and a mouthpiece which covers and matches the surface of the dental cast. After a digital dental model of a patient is obtained, one or more teeth are allowed to contain overlapping of a plurality of design positions, an overlapped body is obtained through model Boolean operation, and a tooth socket is obtained by directly printing the tooth socket on the overlapped body tooth mould or indirectly molding a hot pressing mould. The invisible orthosis and the traditional invisible orthosis of the inventionCompared with the appliance, the tooth socket is arranged on some teeth

Certain gaps exist on the face, the bucco-lingual face or the near-far middle face, the tooth socket has more changed shapes, and the navigation of tooth movement or the adjustment of the correction force can be facilitated to carry out effective anchorage management, so that the correction efficiency of the invisible tooth socket is improved; can also guide teeth to erupt

The inter-jaw relation is adjusted through the locking knots of the teeth, and certain growth improvement effect is achieved.

Description

Bracket-free invisible appliance produced based on tooth multi-position overlapping model and manufacturing method thereof

Technical Field

The invention relates to the technical field of orthodontic, in particular to a bracket-free invisible appliance and a manufacturing method thereof, which are mainly applied to the orthodontic treatment, can optimize the stress performance of the appliance, adjust the sizes of the correction forces of different parts and play a role in guiding the movement of teeth.

Background

The bracket-free invisible appliance is favored by patients due to attractive appearance, comfort and convenience for oral hygiene maintenance, and more patients select the bracket-free invisible appliance to replace the traditional fixed appliance for orthodontic treatment. The bracket-free invisible appliance is a series of invisible braces obtained by scanning dentitions of a patient to generate a digital dentition model, designing a tooth movement sequence in a computer-aided manner, 3D printing the dentition model at each step of movement and finally pressing film and forming, and the braces can also be directly 3D printed on the basis of the digital model. The produced tooth socket is closely attached to the dentition model, and the tooth movement is controlled to achieve the orthodontic aim.

In orthodontics, the deformation of orthodontic braces creates forces that move some teeth. The reaction force to move these teeth will be applied to other teeth that are not desired to be moved, i.e. the anchorage teeth. The quality of anchorage control is very critical to the treatment effect. Because the computer designs that the tooth movement only simulates the change of the relative position relation between teeth, the influence of human biological reaction and the performance of the material of the orthodontic appliance is not considered, the actual position of the rear anchorage tooth when the tooth socket is worn in the mouth is often different from the expected position, namely anchorage loss occurs. If can overlap through the dental cast of multistep position in correcting ware design production, make the facing possess more change appearances, can make its deformation change and change the realization, stress concentration and distribution are more reasonable, and the removal of guide target tooth or the reaction force that reduces anchorage tooth and receive will help improving the efficiency of correcting of stealthy facing.

Orthodontic objectives not only align the teeth in the jaw, but also adjust the jaw-to-jaw relationship to achieve good occlusion. For malpresentation of the jaw bone

Is important to induce eruption of teeth and/or growth of jaw bones to coordinate jaw relations. The existing means at present comprise inter-jaw leather ring traction, tooth socket lateral wing protrusion and tooth socket

Noodle

The cushion and the tooth socket can be used for adjusting the jaw relation by combining a Forsus mandibular guidance device and the like, but the measures depend on the matching of patients, have poor comfort, have the adverse effect of tooth inclination, are unstable and easy to relapse in the adjusted jaw relation and the like. Guiding the eruption of teeth by means of modified mouthpiece if aided by the growth of jaw and natural eruption of teeth

The locking structure of the teeth can be directly used for adjusting the relation between the upper jaw and the lower jaw and realizing certain growth improvement effect. The method is more physiological, comfortable and stable in effect, and is helpful for enhancing the curative effect of the invisible tooth socket on adjusting the jaw relation.

Disclosure of Invention

The invention provides an invisible appliance produced on the basis of overlapping of a plurality of positions of teeth and a manufacturing method thereof. Compared with the traditional invisible appliance, the invisible appliance is used for some teeth

Buccal and lingual surfacesOr certain gaps exist between the near and far surfaces, so that the tooth socket can be reasonably deformed to generate favorable stress, the size and the direction of the correction force can be adjusted, and the aim of effective anchorage management can be fulfilled, thereby effectively improving the correction efficiency of the invisible tooth socket. The tooth socket can also induce teeth to erupt

The relationship between the upper and lower jaws can be adjusted, and the growth improvement effect can be achieved.

In order to achieve the purpose, the invisible appliance provided by the invention comprises a dental cast and a dental mouthpiece covering the surface of the dental cast, wherein the dental cast is a whole or partial overlapped body of a plurality of different position states of teeth, and the dental mouthpiece is a dental mouthpiece matched with the dental cast.

Preferably, the dental model is a digital dental model or a solid dental model generated by 3D printing of the digital dental model.

Preferably, the teeth are all or part of the teeth in the upper and lower dentitions.

Preferably, the overlapping body of the plurality of different position states of the tooth means that the position of the tooth with different designs is different from the overlapping body of another design position or a plurality of design positions of the tooth.

Preferably, the total or partial overlapping body means that after a plurality of design positions of the dentition are overlapped, the maximum surface area of the overlapped total design positions or the surface area of the overlapped partial design positions of different tooth positions or different parts of the teeth can be taken to generate the final overlapped body dental model.

Preferably, the teeth have an attachment formed thereon, the attachment being a portion of the teeth, and the overlap of the plurality of attachment locations may be a maximum surface area or a minimum surface area or intermediate extent of the intersection region.

Preferably, the mouthpiece includes a mouthpiece designed based on the above digital model and then obtained by direct 3D printing or indirect hot-press film forming.

The manufacturing method of the bracket-free invisible appliance produced based on the tooth multi-position overlapping model comprises the following steps:

1) obtaining an initial digital dental model of the patient by intraoral or extraoral scanning;

2) segmenting and three-dimensionally moving teeth on the initial dental model in design software to obtain a target dental model;

3) from the initial dental model to the target dental model, the three-dimensional movement of the teeth is divided into a plurality of steps to obtain a series of stages of dental models;

4) one or more design positions are additionally added to all or part of teeth on the model on the dental model at a certain stage position, and the increase of the design positions can be set by a computer program or manually;

5) overlapping a plurality of teeth in different position states to obtain an overlapped dental model, wherein the plurality of teeth in different position states are overlapped through Boolean operation, the overlapping can be full overlapping or partial overlapping, the full overlapping refers to the maximum surface area overlapped by all design positions, the partial overlapping refers to the surface area overlapped by partial design positions, and the overlapping can be set by a computer program or manually;

6) and directly printing the digital overlapped dental model into the invisible facing, or firstly printing the solid dental model and then carrying out hot-pressing film forming on the solid dental model to obtain the invisible facing.

Preferably, the three-dimensional movement in step 2 comprises translation and rotation.

Preferably, in step 5, if there is an attachment on the tooth, the attachment overlaps as part of the tooth.

It should be noted that the dental model is sometimes abbreviated herein as a dental model.

When the invisible tooth socket is put on the dentition of a patient, the cavity of the tooth socket corresponds to the teeth of the dentition of the patient one by one and is mutually attached, but the teeth with a plurality of overlapped positions are designed

There is some clearance on the face, bucco-lingual surface or mesio-distal surface. Conformable non-void side teeth are subjected to shell deformationThe gap side teeth are not directly applied with the force by the mouthpiece, thereby changing the deformation stress of the conventional mouthpiece.

The invention has the beneficial effects that: the position relation between the tooth socket and the tooth can be designed in a personalized mode instead of the single position relation of the traditional tooth socket with the four sides being attached and wrapped on the tooth, the favorable stress generated by deformation of the tooth socket is reserved or enhanced on the wrapping side, the unfavorable stress of the tooth socket is weakened or eliminated on the gap side, and the tooth socket is enabled to generate reasonable deformation, so that the stress size and direction of the moving tooth and the anchorage tooth are designed flexibly, the target of adjusting the stress of the target tooth and carrying out effective anchorage management is achieved, and the correction efficiency of the invisible tooth socket is effectively improved. In addition, the tooth socket produced based on the dental model with the overlapped tooth step positions can be designed with a guide position or an upper jaw and a lower jaw locking position to induce the tooth eruption

The relationship between the upper and lower jaws can be adjusted, and a certain growth improvement effect can be achieved.

Drawings

Fig. 1 is a bottom view of a dental cast provided by the present invention.

Fig. 2 is a right side view of a dental cast provided by the present invention.

Fig. 3 is a bottom view of the invisible appliance provided by the invention.

FIG. 4 is a right side view of the invisible appliance provided by the present invention.

FIG. 5 is a bottom view of the present invention providing multiple tooth design positions and overlapping elements.

Fig. 6 is a right side view of a concealed appliance for tooth eruption provided by the present invention.

FIG. 7 is a right side view of the overlapping dental cast in multiple design positions for adjusting jaw relation provided by the present invention.

The label 1 in the figure: a plurality of design positions for maxillary tooth # 5; marker 2: a plurality of design positions for maxillary tooth # 7; marker 3: multiple design positions of the upper maxillary # 7 dental attachment; marker 4: an overlay of multiple design positions of maxillary tooth # 5; marker 5: an overlay of multiple design positions of maxillary tooth # 7; marker 6: an overlay of multiple design positions of the accessory; marker 7: a mouthpiece covering the surface of the dental cast; marker 8: the tooth guide is overlapped at a plurality of design positions.

Detailed Description

The invention is an improvement on the basis of the original moving sequence digitalized dental model. The invisible appliance provided by the invention is described below by using specific examples to better illustrate the content of the invention, but the implementation method described does not limit the protection scope of the invention.

The bracket-free invisible appliance is characterized by comprising a dental cast and a tooth socket (7) covered on the surface of the dental cast, wherein the dental cast is a whole or partial overlapped body of a plurality of teeth in different position states, and the tooth socket is matched with the dental cast.

Which can be manufactured by a method comprising the following steps.

1. Firstly, a digitalized three-dimensional dental model of upper and lower teeth of a patient is obtained through intraoral or extraoral scanning, and the model is in an STL format. And (4) segmenting the obtained three-dimensional dental model in three-dimensional software to form an individual tooth model. The tooth models are arranged according to orthodontic objectives to determine the target positions. Comparing the initial position and the target position of each tooth model, and decomposing the movement between the two into a plurality of stage positions according to the patient condition, wherein the movement distance of each stage position is controlled to be 0.2-0.4mm (preferably 0.2-0.3mm), and the rotation angle is controlled to be 1-2 degrees.

2. On the stage dental model, for one or more tooth models, designing one or more additional moving positions consistent with the original moving direction on the basis of the original design position, such as a No. 7 tooth additionally designed two-step far-middle moving position (2) in fig. 1; special shifting positions with different directions from the original shifting sequence can be designed, such as a two-step buccal shifting position (1) additionally designed for No. 5 tooth in fig. 1, and a two-step vertical pressing shifting position (1) additionally designed for No. 5 tooth in fig. 2. The tooth model of the additional design position is overlapped with the original tooth model to form a digital model with a plurality of overlapped design positions.

3. The digital model of the overlay of multiple design locations may be set by a computer program or manually.

4. For a tooth model in which an attachment (3) is designed to the surface of the crown, the attachment is treated as a whole as part of the tooth model, i.e. a digitized model in which a plurality of design positions overlap contains an overlap of the attachment.

5. After a digital model of a tooth with a plurality of overlapped design positions is obtained, an overlapped body model is obtained through Boolean operation. For the overlapped area, according to the requirement of the correction force control, the maximum surface area overlapped by all the design positions can be taken to generate a final overlapped body, such as the maximum surface area (5) overlapped by tooth No. 7 in 3 steps of approaching and far and middle to the design positions and the maximum surface area (4) overlapped by tooth No. 5 in 3 steps of cheek and tongue to the design positions; the surface area of the overlapping of the partial design positions, such as the surface area (4) of the 5 th tooth in the middle design position in the vertical direction in fig. 4, can also be taken. The overlap of attachments may take the maximum surface area of the entire design site or the minimum surface area or intermediate range of intersection areas, such as the surface area of the intersection area (6) of the attachment on tooth 7 in fig. 3 for the 3-step design site. Fig. 5 is an enlarged view of the multi-step design position for tooth 7 (2) and its overlay (5). After the overlapped dental model is obtained, 3D printing a resin model, and then hot-pressing the resin model to form the three-dimensional correction tooth socket (7), or directly 3D printing the three-dimensional correction tooth socket (7) on the overlapped dental model.

6. Compared with the traditional invisible appliance, the produced invisible appliance has the advantages that when the invisible appliance is worn on the dentition in the mouth of a patient, certain teeth are arranged

Certain gaps exist on the face, the buccolingual face or the near-far middle face, so that the navigation of tooth movement is facilitated, and effective anchorage management is performed by adjusting the size of the correction force.

7. For the patient in the growth development stage, as shown in fig. 6, the tooth socket (7) produced based on the tooth model (8) with a plurality of overlapped designed positions of the teeth can guide the eruption direction and position of the upper and lower jaw teeth to induce the eruption of the teeth

To lock the teeth in the right position as shown in fig. 7The exact occlusion position can adjust the relationship between upper and lower jaw to achieve certain growth improvement effect.

The figures are only by way of example and the invention is not limited to the embodiments shown in the figures. Any equivalent modifications and substitutions to those skilled in the art are also within the scope of the present invention. Accordingly, equivalent changes and modifications made without departing from the spirit and scope of the present invention should be covered by the present invention.

Claims

1. The bracket-free invisible appliance is characterized by comprising a dental cast and a tooth socket covering the surface of the dental cast, wherein the dental cast is a whole or partial overlapped body of a plurality of teeth in different position states, and the tooth socket is matched with the dental cast.

2. The bracket-free invisible appliance of claim 1, wherein the dental cast is a digital dental cast or a solid dental cast generated by 3D printing of the digital dental cast.

3. The bracket-free invisible appliance of claim 1 or 2, wherein the teeth are all or part of the teeth in the upper and lower dentitions.

4. The bracket-free invisible appliance of claim 1 or 2, wherein the full or partial overlap of the plurality of different position states of the tooth is a full or partial overlap of one design position and another design position or positions of the tooth.

5. The bracket-free invisible appliance of claim 1 or 2, wherein the teeth are provided with attachments, and the attachments are part of the teeth.

6. The method for manufacturing the bracket-free invisible appliance of any one of claims 1 to 5, which comprises the following steps:

2) three-dimensionally moving teeth on the initial dental model in design software to obtain a target dental model;

4) additionally adding one or more design positions to all or part of teeth on the model on the dental model at a certain stage position;

5) overlapping a plurality of teeth in different position states to obtain an overlapped dental model, wherein the teeth in the different position states can be completely overlapped or partially overlapped;

7. The method of claim 6, wherein the three-dimensional movement of step 2 comprises translation and rotation.

8. The method of claim 6 or 7, wherein in step 5, if the teeth have the attachment, the attachment is overlapped as a part of the teeth.