Design method of jaw pad, method of manufacturing invisible aligner, and invisible aligner

Abstract

The application discloses a design method of a jaw pad, a manufacturing method of an invisible orthodontic appliance and the invisible orthodontic appliance, and belongs to the technical field of tooth correction. The disclosed design method comprises the following steps: acquiring a digital dental and jaw model, wherein the digital dental and jaw model at least comprises a maxillary model, a mandibular model and a first occlusal model; constructing a second occlusal model according to the first occlusal model, wherein the second occlusal model comprises complete occlusal relationship information, and the occlusal relationship information at least comprises occlusal space parameters; determining a jaw pad setting area according to a comparison result of the occlusal space parameters and a preset occlusal threshold value, and forming a jaw pad on the jaw pad setting area, wherein the jaw pad is a structure capable of opening posterior teeth occlusion and is formed by closely connecting a plurality of ellipsoidal structures. The disclosed manufacturing method of the invisible orthodontic appliance and the corresponding invisible orthodontic appliance are both based on the disclosed design method. The application can design a reasonable structure of the appliance without depending too much on the experience of designers.

Description

Technical Field

[0001] This invention belongs to the field of orthodontic technology, specifically relating to a method for designing a jaw pad, a method for manufacturing an invisible aligner, and an invisible aligner. Background Technology

[0002] Jaw pads are structural attachments commonly used in traditional orthodontics. They are used to keep the upper and lower jaws open, eliminating interference between the upper and lower teeth, and assisting orthodontic appliances in correcting the teeth. They are used for various dental malocclusions, such as anterior open bite (…). Figure 1 (a)), anterior crossbite ( Figure 1 (b) posterior crossbite ( Figure 1 (c) posterior crossbite ( Figure 1 (d)), deep overlap ( Figure 1 (e) and other orthodontic techniques require the use of occlusal pads to open the bite, and in some orthodontic techniques, occlusal pads are also used to provide corrective force to assist in the correction of the teeth and jaws.

[0003] When designing a jaw pad, it usually requires an experienced dentist to design a reasonable jaw pad. This results in a high level of experience required from the dentist, relatively low design efficiency, and the possibility of unreasonable structure and easy wear and tear on the jaw pad.

[0004] Currently, a common form of jaw pad in orthodontics is to form the jaw pad structure directly on a shell-shaped dental instrument. However, research has found that the jaw pad structure is easily worn down, causing damage to the orthodontic appliance. Summary of the Invention

[0005] This invention addresses the problems existing in current jaw pad design by providing a jaw pad design method to reduce excessive reliance on the designer's experience, thereby efficiently designing a jaw pad with a reasonable structure. It also provides a method for manufacturing invisible aligners based on the provided design method, as well as the corresponding invisible aligners.

[0006] To address the above problems, in a first aspect, the present invention provides a method for designing a jaw pad, comprising:

[0007] A digital dental model is obtained, which includes at least a maxillary model, a mandibular model, and a first occlusal model, wherein the first occlusal model has partial occlusal relationship information.

[0008] Based on the first occlusal model, a second occlusal model is constructed. The second occlusal model consists of the maxillary model and the mandibular model. The second occlusal model includes complete occlusal relationship information, which includes at least occlusal space parameters.

[0009] Based on the comparison between the occlusal space parameters and the preset occlusal threshold, the occlusal pad setting area is determined, and an occlusal pad is formed on the occlusal pad setting area. The occlusal pad is a structure composed of several tightly connected ellipsoidal structures that can open the occlusion of the posterior teeth.

[0010] In some embodiments, the jaw pad setting area is determined based on a comparison between the occlusal space parameters and a preset occlusal threshold.

[0011] When the occlusal space parameter is less than the first occlusal threshold, the jaw pad is placed on the maxilla or mandible;

[0012] When the occlusal space parameter is greater than or equal to the first occlusal threshold, the jaw pad is placed on the maxilla and mandible, and the jaw pad on the maxilla matches the jaw pad on the mandible.

[0013] When the occlusal space parameter is less than the second occlusal threshold, the jaw pad is placed on one molar on each side of the corresponding jaw.

[0014] When the occlusal space parameter is greater than or equal to the second occlusal threshold, the occlusal pad is placed on at least one molar on the left and right sides of the corresponding jaw.

[0015] In some embodiments, the design method further includes: determining the ellipsoidal structure shape parameters based on the occlusal space parameters and the jaw pad setting area.

[0016] In some embodiments, the design method further includes: determining the arrangement of several ellipsoidal structures based on ellipsoidal structure shape parameters and tooth occlusal surface information.

[0017] In some embodiments, determining the arrangement of the plurality of ellipsoidal structures based on ellipsoidal structure shape parameters and tooth occlusal surface information includes:

[0018] Project the area where the jaw pad is placed onto the occlusal plane along the occlusal direction to obtain the area and shape of the projected area.

[0019] Identify the curved shape of the occlusal surface in the area where the jaw pad is located;

[0020] Based on the shape parameters of the ellipsoidal structure, the area and shape of the projection area, the number and arrangement of ellipsoidal structures are generated. Among them, the fusion of ellipsoidal structures located in the concave area is greater than that of ellipsoidal structures in other positions. The projection area of ​​the entire jaw pad along the occlusal direction on the occlusal plane is greater than 80% of the projection area of ​​the jaw pad setting area.

[0021] In some embodiments, the design method further includes: acquiring an intraoral photograph and calibrating a second occlusal model based on the intraoral photograph.

[0022] In some embodiments, the occlusion relationship information further includes occlusion type, and the method determines the structural parameters and arrangement of the ellipsoidal structure based on the occlusion type.

[0023] A second aspect of the present invention provides a method for manufacturing an invisible aligner, comprising:

[0024] A digital dental model is obtained, which includes at least a maxillary model, a mandibular model, and a first occlusal model, wherein the first occlusal model has partial occlusal relationship information.

[0025] Based on the first occlusal model, a second occlusal model is constructed. The second occlusal model consists of the maxillary model and the mandibular model. The second occlusal model includes complete occlusal relationship information, which includes at least occlusal space parameters.

[0026] Based on the comparison results between the occlusal space parameters and the preset occlusal threshold, the occlusal pad setting area is determined, and an occlusal pad is formed on the occlusal pad setting area. The occlusal pad is a structure composed of several tightly connected ellipsoidal structures that can open the occlusion of the posterior teeth. The digital dental model with the occlusal pad is the first digital dental model.

[0027] Based on the first digital dental model, an invisible aligner is manufactured, and the invisible aligner has a chin pad at a corresponding position.

[0028] In some embodiments, the invisible aligner is integrally formed with the jaw pad.

[0029] In a third aspect, the present invention provides an invisible orthodontic appliance, comprising a first shell-shaped body for accommodating maxillary teeth and a second shell-shaped body for accommodating mandibular teeth, wherein, according to occlusal space parameters, at least the first shell-shaped body or the first shell-shaped body has a occlusal pad designed using the provided design method, the occlusal pad being a structure composed of a plurality of tightly connected ellipsoidal structures capable of opening the occlusion of posterior teeth.

[0030] This invention constructs a precise occlusal relationship in a digital dental model, then compares the occlusal space parameters with a preset occlusal threshold to determine the setting area of ​​the occlusal pad and forms the occlusal pad in the corresponding area. This effectively reduces the dependence on the designer's experience. Furthermore, the occlusal pad is a structure composed of several tightly connected ellipsoidal structures that can open the occlusion of the posterior teeth. Utilizing this type of structure, on the one hand, the ellipsoidal structure, compared with existing rectangular structures, does not have too many stress concentration points, which can not only reduce wear but also withstand greater occlusal forces, avoiding damage to the occlusal pad due to excessive occlusal forces.

[0031] The provided method for manufacturing invisible aligners produces a structurally sound invisible aligner based on the provided design method. The occlusal pad of the invisible aligner is not easily worn, which can improve the life of the aligner and can withstand greater biting force, making it easier to open the jaw. Attached Figure Description

[0032] Figure 1 This is a schematic diagram illustrating several dentofacial deformities applicable to one embodiment of the present invention;

[0033] Figure 2 This is a flowchart of a jaw pad design method in one embodiment of the present invention;

[0034] Figure 3 This is a schematic diagram of constructing a second occlusal model in one embodiment of the present invention;

[0035] Figure 4 This is a schematic diagram of the jaw pad placement position (upper and lower jaw) in one embodiment of the present invention;

[0036] Figure 5 This is a schematic diagram of tooth arrangement in one embodiment of the present invention;

[0037] Figure 6 This is a schematic diagram of the jaw pad placement position (molar) in one embodiment of the present invention;

[0038] Figure 7 This is a schematic diagram of the ellipsoidal structure arrangement design in one embodiment of the present invention;

[0039] Figure 8 This is a schematic diagram of the fusion of two ellipsoidal structures in one embodiment of the present invention;

[0040] Figure 9 This is a schematic diagram illustrating the fusion of ellipsoidal structures on the molar surface in one embodiment of the present invention;

[0041] Figure 10 This is a schematic diagram illustrating the setting of upper and lower jaw pads according to the type of teeth in one embodiment of the present invention;

[0042] Figure 11 This is a flowchart of a method for manufacturing an invisible orthodontic appliance according to an embodiment of the present invention. Detailed Implementation

[0043] To make the above-mentioned objects, features, and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of the present invention. However, the present invention can be practiced in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0044] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0045] Figure 2 A flowchart illustrating a jaw pad design method according to an embodiment of the present invention is shown. (Reference) Figure 2 The design method includes the following steps:

[0046] Step S11: Obtain a digital dental model, wherein the digital dental model includes at least a maxillary model 101, a mandibular model 102, and a first occlusal model 103, wherein the first occlusal model 103 has partial occlusal relationship information.

[0047] In embodiments of the present invention, the digital dental model (whether maxillary or mandibular) may include only the dentition, or it may include the dentition and tooth roots, or it may include the dentition, gingiva, and tooth roots. The maxillary and mandibular dentition models contain complete information about each tooth, such as its shape, position, and information on the occlusal surfaces, such as cusps, fossae, and grooves. When the maxilla and mandible are in occlusion, this occlusal state is scanned and modeled to obtain a first occlusal model 103, which is the model of the visible side. Because information about the lingual side is unavailable, this model does not include the lingual side or the complete state of the teeth, but it can still include some occlusal information, such as the positional relationship between the maxilla and mandible.

[0048] Digital dental models can be obtained using a 3D dental scanner. Through 3D scanning, a point cloud model of the dental jaw is obtained. Then, 3D reconstruction is performed to obtain a digital dental model.

[0049] Step S12: Based on the first occlusal model 103, construct the second occlusal model 104, wherein the second occlusal model 104 is composed of the maxillary model 101 and the mandibular model 102, and the second occlusal model 104 includes complete occlusal relationship information, wherein the occlusal relationship information includes at least occlusal space parameters.

[0050] Although the first occlusal model 103 only has incomplete occlusal relationship information, because the upper and lower jaws are together, at least the relative positions of the upper and lower jaws can be obtained, whereas individual upper or lower jaw models do not have occlusal relationships. Therefore, the first occlusal model 103 can be used as a reference to move the upper and lower jaw models to their corresponding positions to obtain an occlusal model including complete occlusal information, i.e., the second occlusal model 104. In one embodiment, see... Figure 3 You can follow these steps:

[0051] Step S121: Obtain any three points of the maxilla in the first occlusal model 103, and obtain three points at the corresponding positions on the maxillary model 101;

[0052] Step S122: By fitting three points on the maxillary model 101 to three points on the first occlusal model 103, the maxillary model 101 is fitted to the first occlusal model 103.

[0053] Step S123: Following the same method as steps S121-S122, fit the mandibular model 102 onto the first occlusal model 103. Finally, hide or delete the first occlusal model 103 to complete the construction of the second occlusal model 104. At this point, the second occlusal model 104 possesses all occlusal relationship information.

[0054] In some embodiments, the occlusal model constructed by the above method may still have some deviations from the actual occlusal relationship. Therefore, intraoral photographs are used to correct the occlusal model. See [link to relevant documentation] for further details. Figure 3 The operation method is as follows:

[0055] First, take at least three intraoral photographs of the patient in occlusion, both labial and buccal. One of these is a labial intraoral photograph (1041), and the other two are a left buccal intraoral photograph (1042) and a right buccal intraoral photograph (1043). The combination of all intraoral photographs can show all teeth.

[0056] Then, the constructed second occlusal model 104 is compared with intraoral photographs to correct the second occlusal model 104, so that the second occlusal model 104 has more accurate occlusal relationship information.

[0057] In embodiments of the present invention, the occlusal relationship information must at least include occlusal space parameters. In these embodiments, the occlusal space parameters are defined as: the farthest distance between the occlusal surfaces of the maxilla and mandible along the occlusal direction after the maxilla and mandible have engaged. For example, in the case of anterior open bite, this value appears at the incisor position. The distance from a point on the incisal surface of the maxilla to the corresponding point on the mandible along the occlusal direction may be the maximum value; this value is the occlusal space parameter. Figure 1 (a) H is indicated.

[0058] In specific embodiments, this can be accomplished using a computer program, which traverses points on both the maxillary and mandibular occlusal surfaces, and then calculates the distances along the occlusal direction for each point. The maximum value is the occlusal space parameter. In some embodiments, orthodontic analysis software can also be used.

[0059] It should be noted that the occlusal surface of the teeth mentioned here is a real, complex curved surface.

[0060] Step S13: Based on the comparison results between the occlusal space parameters and the preset occlusal threshold, determine the occlusal pad setting area, and form an occlusal pad 105 on the occlusal pad setting area. The occlusal pad 105 is a structure composed of several tightly connected ellipsoidal structures that can open the occlusion of the posterior teeth.

[0061] Since jaw pad placement is typically determined by designers based on experience, choosing appropriate placement locations and shapes, current jaw pads are either rectangular or sheet-like. The side of the jaw pad away from the occlusal surface of the teeth has a shape similar to the occlusal surface. However, this leads to over-reliance on the designer's experience and results in an unbalanced final shape that is prone to wear. In the design method of this invention, a precise occlusal relationship is constructed using a digital dental model. Occlusal space parameters are then compared with preset occlusal thresholds to determine the placement area of ​​the jaw pad, and the jaw pad is formed in the corresponding area. This effectively reduces the reliance on the designer's experience. Furthermore, the jaw pad is a structure composed of several tightly connected ellipsoidal structures that can open the posterior teeth occlusion. This type of structure, compared to existing rectangular structures, avoids excessive stress concentration points, reducing wear and allowing the jaw pad to withstand greater occlusal forces, preventing damage from excessive occlusal forces.

[0062] Furthermore, the design process of the jaw pad of the present invention was completed in a digital environment, and it exists only in digital form before actual manufacturing.

[0063] In an embodiment of the present invention, see Figure 4 As shown, based on the comparison between the occlusal space parameters and the preset occlusal threshold, the jaw pad setting area is determined to include the following situations:

[0064] When the occlusal space parameters are less than the first occlusal threshold, the jaw pad 105 is placed on the maxilla or mandible, such as... Figure 4 (a) When the occlusal space parameter is greater than or equal to the first occlusal threshold, the jaw pads 105 are respectively placed on the maxilla and mandible, with the jaw pads on the maxilla and mandible matching each other, such as... Figure 4 (b)

[0065] The first occlusal threshold is a manually set parameter that can be determined based on existing empirical values. Typically, for severely affected patients, the occlusal space parameter may reach 5mm. In such cases, if the occlusal pad is placed only on the maxilla or mandible, the pad's thickness will inevitably be very large, causing occlusal instability. Furthermore, for occlusal pads molded as a single piece on the appliance, a large cavity will be created, making the pad easily damaged during wear. This invention adjusts the placement of the occlusal pad by setting a first occlusal threshold. Designers only need to use this threshold to quickly determine which jaw the pad should be placed on.

[0066] The above steps provide a reference for which jaw to place the tooth, while the following steps provide a reference for which specific teeth to place it on. For ease of explanation, Figure 5 The diagram shows the arrangement of the teeth. The left and right sides can be considered approximately symmetrical. Following the sequence of molar numbers (①-⑤) (Y1 and Y2 in the diagram), the teeth are the first premolar, second premolar, first molar, second molar, and third molar. The third molar is the wisdom tooth; since many people have their wisdom teeth extracted, the third molar is not present. Then see... Figure 6 Determine which tooth the occlusal pad 105 should be placed on, including:

[0067] When the occlusal space parameter is less than the second occlusal threshold, the occlusal pad 105 is placed on one molar on each side of the corresponding jaw, such as... Figure 6 (a);

[0068] When the occlusal space parameter is greater than or equal to the second occlusal threshold, the occlusal pad 105 is placed on at least one molar on both sides of the corresponding occlusion, such as... Figure 6 (b)

[0069] When the occlusal space parameter is less than the second occlusal threshold, it indicates a small degree of occlusal opening. Therefore, a large jaw pad is not needed to ensure proper occlusal opening. When the occlusal space parameter is greater than or equal to the second occlusal threshold, it is considered that a larger degree of occlusal opening is required. In this case, the area of ​​the jaw pad needs to be set larger. The second occlusal threshold is also a manually set parameter, which can be set based on existing experience. In some cases, the second occlusal threshold can be the same as the first occlusal threshold. When the occlusal space parameter is large, the required degree of occlusal opening is relatively large, so the area of ​​the jaw pad needs to be relatively large. Conversely, the area of ​​the jaw pad can be reduced. This invention adjusts this through the second occlusal threshold, allowing designers to quickly determine the jaw pad placement, reducing reliance on design experience, and resulting in a more reasonable jaw pad. The rationality of the jaw pad includes not only its structure but also its placement.

[0070] By using two parameters, the placement of the jaw pad is determined, thereby reducing the reliance on the designer's experience, improving the design efficiency of the jaw pad, and making the jaw pad design more reasonable.

[0071] In some embodiments, the jaw pad design method of the present invention further includes: determining the shape parameters of the ellipsoidal structure based on occlusal space parameters and the jaw pad placement position. The shape parameters of the ellipsoidal structure mainly include the sphere diameter. For an ellipsoid, it includes the equatorial radius (along the x and y axes in the coordinate system) and the polar radius (along the z axis in the coordinate system). When the equatorial radius and the polar radius are equal, it is a standard sphere. In the description of the present invention, the equatorial radius and the polar radius are no longer distinguished; an ellipsoidal structure with an equatorial radius close to or the same as the polar radius (standard sphere) can be selected, and the ellipsoid diameter will be used uniformly.

[0072] The values ​​of the occlusal space parameters determine the design thickness of the jaw pad, which is determined by the ellipsoidal structural shape parameters. Once the jaw pad's location is determined, the ellipsoidal structural shape parameters can be selected.

[0073] For example, in embodiments where the occlusal space parameter is less than the first occlusal threshold, a jaw pad is placed only on the occlusal surface of the maxilla or mandible, and the diameter of the ellipsoidal structure can be approximately equal to the value of the occlusal space parameter. In embodiments where the occlusal space parameter is greater than or equal to the first occlusal threshold, jaw pads need to be placed on both the maxilla and mandible, and the sum of the thicknesses of the maxillary and mandibular pads should be close to the value of the occlusal space parameter (in the design, the sum of their thicknesses can be equal to the occlusal space parameter). For ease of design, ellipsoidal structures with the same shape parameters can be selected when designing the maxillary and mandibular pads.

[0074] In some embodiments, the jaw pad design method of the present invention further includes: determining the arrangement of several ellipsoidal structures based on ellipsoidal structure shape parameters and tooth occlusal surface information.

[0075] After the ellipsoidal structural parameters are determined, it is necessary to determine the arrangement of the ellipsoidal structures on the occlusal surface of the teeth, including the number of ellipsoidal structures that make up the occlusal pad and how they are arranged.

[0076] In some embodiments, it may be done as follows:

[0077] S131: Project the area where the jaw pad is located onto the occlusal plane 106 along the occlusal direction to obtain the area and shape of the projected area 107, such as... Figure 7 The occlusal direction is perpendicular to the plane of the paper. It should be noted that the occlusal plane 106 is a virtual plane, perpendicular to the occlusal direction.

[0078] S132: Identify the curved shape of the occlusal surface in the area where the jaw pad is located.

[0079] S133: Generate the number and arrangement of ellipsoidal structures based on the shape parameters of the ellipsoidal structure, the area and shape of the projected region.

[0080] In an embodiment of the invention, after obtaining the area of ​​the projected region, the area value can be divided by the diameter of the ellipsoidal structure to roughly determine the number of ellipsoidal structures. Since the occlusal surface of the teeth is a complex curved surface, its area will be larger than the area obtained from the projection. Therefore, the number of ellipsoidal structures can be multiplied by a value greater than 1, which can be selected between 1.1 and 1.5 to ensure that the number of ellipsoidal structures is sufficient. Then, according to the shape of the projected region, several ellipsoidal structures are arranged in rows (or columns) to cover the entire region. These ellipsoidal structures are then arranged in corresponding positions on the occlusal surface of the teeth, and finally, local adjustments (including deletions) are made.

[0081] Because the occlusal surface of a tooth is not a flat surface but a complex curved surface, when several ellipsoidal structures are arranged on the occlusal surface, some ellipsoidal structures will fall in the concave areas, while other ellipsoidal structures will fall in the non-concave areas. When all the ellipsoidal structures fall on the occlusal surface, the shape away from the occlusal surface of the tooth will be basically consistent with the occlusal surface of the tooth.

[0082] To ensure a close arrangement between ellipsoidal structures, partial fusion (or intersection) can occur between them, such as... Figure 8 In the diagram, the intersecting region d of two ellipsoidal structures is represented by the value d, which measures the degree of fusion. When partial fusion of ellipsoidal structures occurs, the total area covered by all ellipsoidal structures will inevitably decrease. After fusion between ellipsoidal structures, the projected area of ​​the entire occlusal pad along the occlusal direction on the occlusal plane must be greater than 80% of the projected area of ​​the occlusal pad's placement area. When ellipsoidal structures fuse with each other, the degree of fusion of ellipsoidal structures located in the occlusal depression is greater than that of ellipsoidal structures in other locations. Figure 9 As shown in the diagram, d1 is merged in the concave region, and d2 is merged in other regions, where d1 > d2.

[0083] It should be noted that, regardless of the design, the occlusal pad on each tooth jaw consists of only one ellipsoidal structure.

[0084] In some embodiments, the occlusal relationship information in this invention further includes occlusal type, wherein in embodiments of this invention, see [link to relevant documentation]. Figure 1 The possible occlusal types involved include anterior open bite, posterior crossbite, posterior reverse overbite, deep overbite (overbite), and anterior reverse overbite (underbite). For cases where occlusal pads are placed in both the maxilla and mandible, the ellipsoidal structure used for the entire occlusal pad can be the same for anterior open bite, posterior crossbite, and posterior reverse overbite, such as... Figure 10(a) For deep overbite, jaw pads can be used for correction. In this case, jaw pads 105 need to be placed on the maxilla and mandible respectively, such as... Figure 10 (b) For maxillary pad 105a, it can be along the molar sequence direction ( Figure 5 In the middle Y1 and Y2), the diameter of the ellipsoidal structure gradually increases. For the mandibular pad 105b, the diameter of the ellipsoidal structure gradually decreases along the molar sequence. During occlusion, the interaction between the maxillary and mandibular pads can generate a posterior force F1 on the maxilla and an anterior force F2 on the mandible. In cases of anterior crossbite, such as... Figure 10 (c) For the maxillary pad 105a, the diameter of the ellipsoidal structure gradually decreases along the molar sequence, while for the mandibular pad 105b, the diameter of the ellipsoidal structure gradually increases along the molar sequence. During occlusion, the maxillary and mandibular pads interact, generating a posteroanterior force F1 on the maxilla and a posterolateral force F2 on the mandible. Orthodontic treatment can be aided by these pads.

[0085] Secondly, in embodiments of the present invention, based on the proposed jaw pad design method, a method for manufacturing an invisible aligner is provided, such as... Figure 11 A flowchart of the method for manufacturing invisible orthodontic appliances according to an embodiment of the present invention is shown, in conjunction with... Figure 11 The method includes the following steps:

[0086] Step S21: Obtain a digital dental model, which includes at least a maxillary model 101, a mandibular model 102, and a first occlusal model 103, wherein the first occlusal model 103 has partial occlusal relationship information.

[0087] Step S22: Based on the first occlusal model 103, construct the second occlusal model 104. The second occlusal model 104 is composed of the maxillary model 101 and the mandibular model 102. The second occlusal model 104 includes complete occlusal relationship information, which includes at least occlusal space parameters.

[0088] Step S23: Based on the comparison results between the occlusal space parameters and the preset occlusal threshold, determine the occlusal pad setting area, and form an occlusal pad on the occlusal pad setting area. The occlusal pad is a structure composed of several tightly connected ellipsoidal structures that can open the occlusion of the posterior teeth. The digital dental model with the occlusal pad designed is the first digital dental model.

[0089] Step S24: Based on the first digital dental model, manufacture an invisible aligner, wherein the corresponding position of the invisible aligner has a chin pad.

[0090] After obtaining the first digital dental model, a physical dental model can be printed using 3D printing technology. This physical model also has the corresponding occlusal pad structure. Then, a polymer film is thermoformed and pressed onto the physical dental model. Finally, the clear aligner is obtained through cutting and trimming. The clear aligner is shaped like the dentition and has raised occlusal pads at the corresponding tooth positions. The occlusal pads and the aligner are molded as a single unit.

[0091] Because the present invention has already achieved a reasonable jaw pad structure in the jaw pad design, a reasonably structured invisible aligner can be manufactured using the corresponding manufacturing method, and the manufactured invisible aligner has a jaw pad.

[0092] It should be noted that, in the embodiments of the present invention, since the digital models of the upper and lower jaws have been designed simultaneously, and jaw pads may appear on the upper or lower jaw, or may exist on both the upper and lower jaws, the orthodontic appliances for the upper and lower jaws can be manufactured in pairs.

[0093] For details regarding the relevant steps involved in the manufacturing process, please refer to the specifications disclosed in the design methodology; they will not be repeated here.

[0094] Thirdly, in embodiments of the present invention, based on the provided occlusal pad design method, an invisible orthodontic appliance is provided. This invisible orthodontic appliance is a pair, comprising a first shell-shaped body accommodating maxillary teeth and a second shell-shaped body accommodating mandibular teeth. According to occlusal space parameters, at least the first shell-shaped body or the first shell-shaped body has an occlusal pad formed using the design method described in the embodiments of the present invention. This occlusal pad is a structure composed of several tightly connected ellipsoidal structures capable of opening the posterior tooth occlusion. That is, when an occlusal pad is required on the maxilla according to the design method, the first shell-shaped body has an occlusal pad; similarly, when an occlusal pad is required on the mandible according to the design method, the second shell-shaped body has an occlusal pad; when an occlusal pad is required on both the maxilla and mandible according to the design method, an occlusal pad is present on both the first shell-shaped body and the second shell-shaped body.

[0095] The specific advantages of this invisible aligner are as follows: First, the occlusal pad is formed by a series of closely arranged ellipsoidal structures, which has stronger wear resistance than existing structures, thereby increasing the lifespan of the aligner; Second, the close arrangement of several ellipsoidal structures to form the occlusal pad structure can effectively reduce the cavity generated at the occlusal pad, thereby being able to withstand greater biting force and making it easier to open the jaw.

[0096] Fourthly, in embodiments of the present invention, an electronic device is also provided, including a memory and a processor. The memory stores a computer program, and the processor executes the computer program to perform the following steps: acquiring a digital dental model, the digital dental model including at least a maxillary model, a mandibular model, and a first occlusal model, the first occlusal model having partial occlusal relationship information; constructing a second occlusal model based on the first occlusal model, the second occlusal model consisting of the maxillary model and the mandibular model, the second occlusal model including complete occlusal relationship information, the occlusal relationship information including at least occlusal space parameters; determining a occlusal pad setting area based on the comparison result of the occlusal space parameters and a preset occlusal threshold, forming an occlusal pad on the occlusal pad setting area, the occlusal pad being a structure composed of several tightly connected ellipsoidal structures capable of opening the posterior tooth occlusion.

[0097] Fifthly, in embodiments of the present invention, a readable computer storage medium is also provided, on which a computer program is stored. When the computer program is executed by a processor, the following steps are performed: acquiring a digital dental model, the digital dental model including at least a maxillary model, a mandibular model, and a first occlusal model, the first occlusal model having partial occlusal relationship information; constructing a second occlusal model based on the first occlusal model, the second occlusal model consisting of a maxillary model and a mandibular model, the second occlusal model including complete occlusal relationship information, the occlusal relationship information including at least occlusal space parameters; determining a occlusal pad setting area based on the comparison result of the occlusal space parameters and a preset occlusal threshold, forming an occlusal pad on the occlusal pad setting area, the occlusal pad being a structure composed of several tightly connected ellipsoidal structures capable of opening the posterior tooth occlusion.

[0098] Those skilled in the art will understand that all or part of the processes in the methods of the above embodiments can be implemented by a computer program instructing related hardware. The computer program can be stored in a non-volatile computer-readable storage medium, and when executed, it can include the processes of the embodiments of the above methods. Any references to memory, databases, or other media used in the embodiments provided in this application can include at least one of non-volatile and volatile memory. Non-volatile memory can include read-only memory (ROM), magnetic tape, floppy disk, flash memory, optical memory, high-density embedded non-volatile memory, resistive random access memory (ReRAM), magnetic random access memory (MRAM), ferroelectric random access memory (FRAM), phase change memory (PCM), graphene memory, etc. Volatile memory can include random access memory (RAM) or external cache memory, etc. By way of illustration and not limitation, RAM can take many forms, such as Static Random Access Memory (SRAM) or Dynamic Random Access Memory (DRAM). The databases involved in the embodiments provided in this application may include at least one type of relational database and non-relational database. Non-relational databases may include, but are not limited to, blockchain-based distributed databases. The processors involved in the embodiments provided in this application may be general-purpose processors, central processing units, graphics processing units, digital signal processors, programmable logic devices, quantum computing-based data processing logic devices, etc., and are not limited to these.

[0099] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0100] The above embodiments merely illustrate several implementation methods of the present invention, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of this invention patent should be determined by the appended claims.

Claims

1. A method for designing a jaw pad, characterized in that, include: A digital dental model is obtained, which includes at least a maxillary model, a mandibular model, and a first occlusal model, wherein the first occlusal model has partial occlusal relationship information. Based on the first occlusal model, a second occlusal model is constructed. The second occlusal model consists of the maxillary model and the mandibular model. The second occlusal model includes complete occlusal relationship information, which includes at least occlusal space parameters. Based on the comparison between the occlusal space parameters and the preset occlusal threshold, a occlusal pad setting area is determined, and an occlusal pad is formed on the occlusal pad setting area. The occlusal pad is a structure composed of several tightly connected ellipsoidal structures that can open the occlusion of the posterior teeth, wherein: Project the area where the jaw pad is placed onto the occlusal plane along the occlusal direction to obtain the area and shape of the projected area. Identify the curved shape of the occlusal surface in the area where the jaw pad is located; Based on the shape parameters of the ellipsoidal structure, the area and shape of the projection area, the number and arrangement of ellipsoidal structures are generated. Among them, the fusion of ellipsoidal structures located in the concave area is greater than that of ellipsoidal structures in other positions. The projection area of ​​the entire jaw pad along the occlusal direction on the occlusal plane is greater than 80% of the projection area of ​​the jaw pad setting area. The occlusal relationship information also includes the occlusal type, and the design method determines the structural parameters and arrangement of the ellipsoidal structure based on the occlusal type.

2. The jaw pad design method according to claim 1, characterized in that, Based on the comparison between the occlusal space parameters and the preset occlusal threshold, the jaw pad setting area is determined to include: When the occlusal space parameter is less than the first occlusal threshold, the jaw pad is placed on the maxilla or mandible; When the occlusal space parameter is greater than or equal to the first occlusal threshold, the jaw pad is placed on the maxilla and mandible, and the jaw pad on the maxilla matches the jaw pad on the mandible. When the occlusal space parameter is less than the second occlusal threshold, the jaw pad is placed on one molar on each side of the corresponding jaw. When the occlusal space parameter is greater than or equal to the second occlusal threshold, the occlusal pad is placed on at least one molar on the left and right sides of the corresponding jaw.

3. The jaw pad design method according to claim 2, characterized in that, The design method further includes: determining the ellipsoidal structure shape parameters based on the occlusal space parameters and the jaw pad setting area.

4. The jaw pad design method according to claim 3, characterized in that, The method further includes: determining the arrangement of several ellipsoidal structures based on the shape parameters of the ellipsoidal structure and the information of the occlusal surface of the teeth.

5. The jaw pad design method according to any one of claims 1-4, characterized in that, The design method further includes: acquiring intraoral photographs and calibrating a second occlusal model based on the intraoral photographs.

6. A method for manufacturing an invisible aligner, characterized in that, Using the jaw pad design method described in any one of claims 1-5, a digital dental model with a jaw pad is obtained.

7. An invisible aligner, characterized in that, It includes a first shell-shaped body for accommodating maxillary teeth and a second shell-shaped body for accommodating mandibular teeth. According to occlusal space parameters, at least the first shell-shaped body or the first shell-shaped body has a occlusal pad designed using the design method described in any one of claims 1-5. The occlusal pad is a structure composed of a plurality of tightly connected ellipsoidal structures capable of opening the occlusion of posterior teeth.

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