Bracketless invisible orthodontic appliance produced based on overlapping models of multiple tooth positions and manufacturing method thereof

Abstract

The present invention provides a bracketless invisible brace produced based on a dental mold with overlapping multiple design positions of teeth and a manufacturing method thereof, which belongs to the field of invisible braces in orthodontic technology. The brace includes a dental mold and a brace covering the surface of the dental mold and matching it. After obtaining a digital dental model of the patient, one or more teeth are allowed to overlap multiple design positions, and an overlapping body is obtained by Boolean operation of the model, and the brace is directly printed on the overlapping body dental mold or indirectly hot-pressed to obtain the brace. Compared with traditional invisible braces, the invisible brace of the present invention has certain gaps on certain tooth surfaces, buccal and lingual surfaces or mesiodistal surfaces, and the brace has more variable shapes, which is conducive to the navigation of tooth movement or the adjustment of the size of the correction force for effective support management, thereby improving the correction efficiency of the invisible brace; it can also guide the eruption of teeth, adjust the jaw relationship through the locking of teeth, and have a certain growth improvement effect.

Description

Technical Field

[0001] The present invention relates to the technical field of oral orthodontics, and in particular to a bracketless invisible orthodontic appliance and a manufacturing method thereof, which is mainly used in orthodontic treatment to optimize the stress performance of the orthodontic appliance, adjust the magnitude of the orthodontic force at different parts, and play a navigation role in tooth movement. Background Art

[0002] Bracketless invisible braces are favored by patients because of their beauty, comfort and ease of oral hygiene maintenance. More and more patients choose bracketless invisible braces instead of traditional fixed braces for orthodontic treatment. Bracketless invisible braces are a series of invisible braces obtained by scanning the patient's dentition to generate a digital dentition model, computer-aided design of the tooth movement sequence, 3D printing of the dentition model of each step of movement, and finally pressing and molding. Braces can also be directly 3D printed based on the digital model. The produced braces fit closely with the dentition model to control tooth movement to achieve orthodontic goals.

[0003] In orthodontics, the deformation of orthodontic braces generates force, causing some teeth to move. The reaction force that causes these teeth to move will be applied to other teeth that do not want to move. These teeth that do not want to move are called support teeth. The quality of support control is critical to the treatment effect. Since computer-designed tooth movement only simulates the changes in the relative position relationship between teeth, without considering the influence of human biological reactions and the properties of the orthodontic material, the actual position of the support teeth after the braces are worn in the mouth is often different from the expected position, that is, support loss occurs. If the braces can have more variable shapes by overlapping tooth molds at multiple positions during the design and production of the orthodontic appliance, it can make its deformation easier to achieve, the stress concentration and distribution can be more reasonable, and the movement of the target teeth can be guided or the reaction force on the support teeth can be reduced, which will help improve the correction efficiency of invisible braces.

[0004] The goal of orthodontics is not only to align the teeth in the jaw, but also to adjust the jaw relationship between the upper and lower jaws to obtain a good bite. For patients in the growth and development period, it is very important to induce the eruption of teeth and / or the growth of the jaws to coordinate the relationship between the jaws. The existing methods include intermaxillary leather ring traction, braces lateral pterygoid process, braces noodle Pads, braces and Forsus mandibular advancement devices can be used to adjust the inter-jaw relationship, but these methods rely on the patient's cooperation, have poor comfort, have the adverse effect of tooth tilting, and the adjusted inter-jaw relationship is unstable and prone to recurrence. , the locking knot of teeth can be directly used to adjust the relationship between the upper and lower jaws and achieve a certain growth improvement effect. This method is more physiological, more comfortable, and more stable, which will help enhance the efficacy of invisible braces in adjusting the relationship between the jaws. Summary of the invention

[0005] The present invention provides an invisible brace produced based on overlapping multiple positions of teeth and a manufacturing method thereof. Compared with the invisible brace produced by traditional methods, the invisible brace has the advantages of The presence of a certain amount of space on the buccal, buccal and lingual surfaces or the mesiodistal surface is conducive to the reasonable deformation of the braces and the generation of favorable stress, which can achieve the goal of adjusting the size and direction of the correction force and conducting effective support management, thereby effectively improving the correction efficiency of invisible braces. , adjust the relationship between the upper and lower jaws, and have a certain growth improvement effect.

[0006] In order to achieve the above-mentioned purpose, the invisible orthodontic appliance provided by the present invention comprises a dental mold and a brace covering the surface of the dental mold, wherein the dental mold is a full or partial overlapping body of multiple teeth in different position states, and the brace is a brace matching the dental mold.

[0007] Preferably, the dental cast is a digital dental cast or a physical dental cast generated by 3D printing of a digital dental cast.

[0008] Preferably, the teeth are all or part of the teeth in the upper and lower dentition.

[0009] Preferably, the overlapping bodies of the teeth in multiple different position states refer to the overlapping bodies of a certain designed position of the teeth and one or more other designed positions, and there are differences in the tooth positions of different designs.

[0010] Preferably, the fully or partially overlapping body means that after multiple design positions of the dentition overlap, different tooth positions or different parts of the teeth can take the maximum surface area of ​​the overlap of all design positions or the surface area of ​​the overlap of some design positions to generate the final overlapping body dental model.

[0011] Preferably, there are attachments on the teeth, and the attachments are part of the teeth. The overlap of the attachments at multiple designed positions can take the maximum surface area or the minimum surface area of ​​the intersection area or an intermediate range.

[0012] Preferably, the braces include braces designed based on the above digital model and then obtained by direct 3D printing or indirect hot pressing film molding.

[0013] The method for manufacturing a bracketless invisible orthodontic appliance based on a multiple-position overlapping model of teeth comprises the following steps:

[0014] 1) Obtain the patient's initial digital dental model through intraoral or extraoral scanning;

[0015] 2) Segment and three-dimensionally move the teeth on the initial jaw model in the design software to obtain the target jaw model;

[0016] 3) From the initial jaw model to the target jaw model, the three-dimensional movement of the teeth is divided into multiple steps to obtain a series of jaw models;

[0017] 4) On the dental model at a certain stage, one or more additional design positions are added to all or part of the teeth on the model. The addition of design positions can be set by a computer program or manually;

[0018] 5) Overlapping multiple teeth in different positions to obtain an overlapping dental model. Multiple tooth models in different positions are overlapped by Boolean operation. The overlap can be full overlap or partial overlap. Full overlap refers to taking the maximum surface area of ​​all designed positions overlapped, and partial overlap refers to taking the surface area of ​​some designed positions overlapped. The overlap can be set by a computer program or manually.

[0019] 6) Print invisible braces directly from the digital overlapping dental model, or print out the physical dental model first, and then perform hot pressing film molding on the physical dental model to obtain invisible braces.

[0020] Preferably, the three-dimensional movement in step 2 includes translation and rotation.

[0021] Preferably, in step 5, if there is an attachment on the tooth, the attachment is overlapped as a part of the tooth.

[0022] It should be noted that the dental model in this article is sometimes abbreviated as dental model.

[0023] When the invisible braces are put on the patient's dentition, the cavity of the braces corresponds to the teeth of the patient's dentition one by one and fits each other, but the design of multiple overlapping teeth There is a certain gap between the teeth on the face, buccal and lingual surfaces or the mesiodistal surface. The teeth on the non-gap side of the fitting are subjected to the force exerted by the deformation of the braces, while the teeth on the gap side are not directly subjected to the force exerted by the braces, thus changing the deformation stress of the traditional braces.

[0024] The beneficial effect of the present invention is that it is no longer a single positional relationship of traditional braces that fit and wrap teeth on all four sides, but the positional relationship between the braces and teeth can be designed in a personalized way, retaining or enhancing the favorable stress generated by the deformation of the braces on the wrapping side, weakening or eliminating the unfavorable stress of the braces on the gap side, so that the braces produce reasonable deformation, thereby flexibly designing the force magnitude and direction of the mobile teeth and the supporting teeth, achieving the goal of adjusting the force of the target teeth and performing effective support management, thereby effectively improving the correction efficiency of invisible braces. In addition, the braces produced based on the dental mold with overlapping tooth positions can be designed with guide positions or upper and lower jaw locking positions to induce tooth eruption and build , adjust the relationship between the upper and lower jaws, and have a certain growth improvement effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a bottom view of the dental model provided by the present invention.

[0026] Figure 2 It is a right view of the dental model provided by the present invention.

[0027] Figure 3 It is a bottom view of the invisible orthodontic appliance provided by the present invention.

[0028] Figure 4 It is a right view of the invisible braces provided by the present invention.

[0029] Figure 5 It is a bottom view of multiple designed positions and overlapping bodies of teeth provided by the present invention.

[0030] Figure 6 It is a right side view of the invisible orthodontic appliance for guiding tooth eruption provided by the present invention.

[0031] Figure 7 It is a right view of a dental model with multiple overlapping design positions for adjusting the inter-jaw relationship provided by the present invention.

[0032] Mark 1 in the figure: multiple design positions of maxillary tooth No. 5; Mark 2: multiple design positions of maxillary tooth No. 7; Mark 3: multiple design positions of accessories on maxillary tooth No. 7; Mark 4: overlapping bodies of multiple design positions of maxillary tooth No. 5; Mark 5: overlapping bodies of multiple design positions of maxillary tooth No. 7; Mark 6: overlapping bodies of multiple design positions of accessories; Mark 7: braces covering the surface of the dental model; Mark 8: overlapping bodies of multiple design positions of tooth eruption guides. DETAILED DESCRIPTION

[0033] The present invention is an improvement on the original mobile sequence digital dental model. The invisible orthodontic appliance provided by the present invention is described below with a specific example to better illustrate the content of the present invention, but the described implementation method does not limit the protection scope of the present invention.

[0034] The bracketless invisible orthodontic appliance of the present invention is characterized in that it comprises a dental model and a dental brace (7) covering the surface of the dental model, wherein the dental model is a full or partial overlap of a plurality of teeth in different position states, and the dental brace is a dental brace matching the dental model.

[0035] It can be produced by a method comprising the following steps.

[0036] 1. First, obtain the digital three-dimensional dental models of the patient's upper and lower teeth in STL format through intraoral or extraoral scanning. Segment the obtained three-dimensional dental models in the three-dimensional software to form separate tooth models. Arrange these tooth models according to the orthodontic goals to determine the target position. Compare the initial position and target position of each tooth model, and decompose the movement between the two into multiple stage positions according to the patient's condition. The movement distance of each stage position is controlled at 0.2-0.4mm (preferably 0.2-0.3mm), and the rotation angle is controlled at 1-2°.

[0037] 2. On the stage dental model, for one or more tooth models, design one or more additional steps of movement positions consistent with the original movement direction based on the original design position, such as Figure 1 Two additional distal movement positions (2) are designed for tooth No. 7 in the middle; special movement positions that are inconsistent with the original movement sequence direction can also be designed, such as Figure 1 The middle tooth No. 5 is designed with two additional buccal movement positions (1). Figure 2 Two additional vertical indentation positions (1) were designed for tooth No. 5. The tooth model at the additional designed position was overlapped with the original tooth model to form a digital model with multiple overlapping designed positions.

[0038] 3. The digital model with multiple overlapping design positions can be set by computer program or manually.

[0039] 4. For a tooth model with attachments (3) designed on the crown surface, the attachments are treated as a part of the tooth model as a whole, that is, the digital model with multiple overlapping design positions includes the overlap of the attachments.

[0040] 5. After obtaining the digital model of multiple overlapping design positions of teeth, the overlapping body model is obtained through Boolean operation. For the overlapping area, according to the requirements of correction force control, the maximum surface area of ​​all overlapping design positions can be taken to generate the final overlapping body, such as Figure 3 For tooth No. 7, the maximum surface area of ​​the three-step mesiodistal design position overlap is taken (5), and for tooth No. 5, the maximum surface area of ​​the three-step buccal-lingual design position overlap is taken (4); the surface area of ​​partial design position overlap can also be taken, such as Figure 4The surface area of ​​the middle step design position of the middle tooth in the vertical direction is taken (4). The overlap of the attachment can take the maximum surface area of ​​all design positions or the minimum surface area of ​​the intersection area or the middle range, such as Figure 3 The surface area of ​​the intersection area of ​​the attachment on tooth No. 7 in the middle is taken from the 3-step design position (6). Figure 5 The multi-step design position (2) of tooth No. 7 and its overlapping body (5) are magnified. After obtaining the overlapping body dental model, a resin model is 3D printed, and then a three-dimensional corrective brace (7) is obtained by hot pressing on the resin model, or the three-dimensional corrective brace (7) is directly 3D printed on the overlapping body dental model.

[0041] 6. Compared with traditional invisible braces, the produced invisible braces are more sensitive to certain teeth when worn on the patient's dentition. There should be a certain amount of space on the facial, buccal and lingual surfaces or the mesiodistal surfaces to facilitate the navigation of tooth movement and adjust the size of the orthodontic force for effective anchorage management.

[0042] 7. For patients in the growth and development period, Figure 6 The dental brace (7) produced based on the dental model (8) with multiple overlapping design positions of the teeth can guide the direction and position of the eruption of the upper and lower teeth, induce the eruption of the teeth, and construct , so that the teeth Figure 7 The lock is in the correct occlusal position, thereby adjusting the relationship between the upper and lower jaws and achieving a certain growth improvement effect.

[0043] The accompanying drawings are only examples, and the present invention is not limited to the embodiments shown in the accompanying drawings. For those skilled in the art, any equivalent modifications and substitutions made to the present invention are also within the scope of the present invention. Therefore, equal changes and modifications made without departing from the spirit and scope of the present invention should be included in the scope of the present invention.

Claims

1. A bracketless invisible brace appliance, characterized in that: It includes a dental model and a dental brace covering the surface of the dental model, wherein the dental model is a full or partial overlap of multiple teeth in different positions, and the dental brace is a dental brace matching the dental model. The whole or part of the overlapping bodies of the multiple different position states of the teeth are the whole or part of the overlapping bodies of a certain designed position of the teeth and one or more other designed positions. The teeth are all or part of the teeth in the upper and lower dentition.

2. The bracketless invisible brace appliance according to claim 1, characterized in that: The dental model is a digital dental model or a physical dental model generated by 3D printing of a digital dental model.

3. The bracketless invisible brace appliance according to claim 1 or 2, characterized in that: Teeth have attachments, which are parts of the teeth.

4. The method for manufacturing a bracketless invisible brace appliance according to any one of claims 1 to 3, comprising the following steps: 1) Obtain the patient's initial digital dental model through intraoral or extraoral scanning; 2) Perform three-dimensional movement of the teeth on the initial jaw model in the design software to obtain the target jaw model; 3) From the initial jaw model to the target jaw model, the three-dimensional movement of the teeth is divided into multiple steps to obtain a series of jaw models; 4) On the dental model at a certain stage, add one or more additional design positions for all or part of the teeth on the model; 5) Overlapping multiple teeth in different positions to obtain an overlapping dental model. The overlapping of multiple teeth in different positions can be full overlap or partial overlap; 6) Print invisible braces directly from the digital overlapping dental model, or print out the physical dental model first, and then perform hot pressing film molding on the physical dental model to obtain invisible braces.

5. The method according to claim 4, wherein: The three-dimensional movement in step 2 includes translation and rotation.

6. The method according to claim 4 or 5, wherein: In step 5, if there is an attachment on the tooth, the attachment is overlapped as a part of the tooth.

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