Dental arch appliance and dental arch correction system

Abstract

The utility model discloses a dental arch appliance and a dental arch correction system, the appliance comprises a shell-shaped body, the shell-shaped body is used for being sleeved on a dental crown of a tooth along the dentition direction, the appliance further comprises an extension part, the extension part is connected with the lingual edge of the shell-shaped body in the height direction of the tooth, and the extension part is connected with the lingual edge of the shell-shaped body. The tongue-side gingival edge extends in the direction far away from the tooth tip; and in the dentition direction, the extension part is arranged around the tongue side edge. The rigidity of the appliance is enhanced by changing the form of the appliance, specifically, the extension part is arranged on the lingual side edge of at least one tooth, the cutting line of the shell-shaped body on the lingual side edge can be prolonged, the inertia moment of the appliance in the maxillofacial projection direction is increased, and therefore the rigidity of the appliance in the dental arch force application direction is improved.

Description

Technical Field

[0001] This utility model belongs to the field of dental orthodontic technology, and particularly relates to invisible aligners, specifically to a dental arch aligner and dental arch aligner system. Background Technology

[0002] Invisible aligners are becoming increasingly common, but due to their shape and material properties, they cannot achieve ideal results in certain indications. For example, in cases requiring arch expansion, such as narrow dental arches, the rigidity of invisible aligners is insufficient, resulting in poor orthodontic effects. Utility Model Content

[0003] The technical problem to be solved by this utility model is to overcome the above-mentioned defects in the prior art and provide a dental arch appliance and dental arch correction system.

[0004] The present invention solves the above-mentioned technical problems through the following technical solution:

[0005] A dental arch appliance includes a shell-shaped body for fitting crowns onto teeth along the dentition direction, and the appliance also includes an extension portion.

[0006] In the height direction of the teeth, the extension is connected to the lingual edge of the shell-like body and extends away from the cusp beyond the lingual gingival margin; in the dentition direction, the extension is disposed around the lingual edge of at least one tooth, and the extension is used to assist in orthodontic treatment.

[0007] In this scheme, the rigidity of the orthodontic appliance is enhanced by changing its shape. Specifically, an extension is provided on the lingual edge of at least one tooth, which can extend the cutting line of the shell-like body on the lingual edge, increase the moment of inertia of the appliance in the direction of the maxillofacial projection, and thus improve the rigidity of the appliance in the direction of the force applied to the dental arch.

[0008] Optionally, the extension satisfies any one of the following:

[0009] When the shell-shaped body is fitted onto the upper teeth, the distance between the extended edge of the extended portion and the lingual gingival margin is more than 2 mm;

[0010] When the shell-shaped body is fitted onto the upper teeth, the distance between the extended edge of the extended portion and the lingual gingival margin is 3-10 mm;

[0011] The extension covers the entire maxillary tissue;

[0012] When the shell-shaped body is fitted onto the lower teeth, the distance between the extended edge of the extension portion and the gingival margin ranges from 2 to 5 millimeters.

[0013] Optionally, the extension length in the anterior tooth region is greater than the extension length in the posterior tooth region.

[0014] Optionally, the expansion design amount of the orthodontic appliance in the distal direction is greater than or equal to the expansion design amount in the mesial direction.

[0015] In this solution, this setup can adapt to the shape of the dental arch and improve the arch expansion effect.

[0016] Optionally, the extension has a first region extending beyond the lingual gingival margin, at least a portion of which is in contact with oral mucosal tissue.

[0017] In this design, the first area comes into contact with the oral mucosa to abut against the oral mucosal tissue, thereby improving the orthodontic effect when the appliance is used.

[0018] Optionally, the extension is provided with reinforcing ribs along the cheek-tongue direction.

[0019] In this design, by adding reinforcing ribs, the structural strength of the extension section can be improved, thereby further enhancing the rigidity of the orthodontic appliance.

[0020] When the extension covers the entire maxillary tissue, the reinforcing rib is located at a position opposite to the maxillary tissue.

[0021] When the extension does not cover the entire maxillary tissue, the reinforcing rib is located near the anterior teeth of the extension.

[0022] Optionally, the extension is an integral structure, and / or the extension is integrally formed with the shell-shaped body.

[0023] In this solution, by adopting the above structural form, sufficient strength can be provided to improve the orthodontic effect.

[0024] Optionally, in the region where the extension corresponds to the posterior teeth, the arch expansion design amount near the lingual gingival margin is greater than the arch expansion design amount away from the lingual gingival margin.

[0025] This approach allows for the appropriate setting of the expansion design amount at different locations based on the structural characteristics of the oral cavity, which is beneficial for expansion correction.

[0026] Optionally, the extension may be detachably or fixedly connected to a reinforcing part, wherein the elastic modulus of the reinforcing part is greater than that of the extension.

[0027] In this design, the reinforcing part has a higher elastic modulus than the shell-shaped body or the extension, which gives the appliance a higher corrective force.

[0028] Optionally, the shell-shaped body has an opening at the position corresponding to the tooth tip.

[0029] In this solution, by adopting the above structural form, saliva can be drained out of the cavity formed by the orthodontic appliance.

[0030] Optionally, the extension length of the orthodontic appliance on the lip and cheek side is less than the extension length on the lingual side.

[0031] Optionally, the thickness of the diaphragm of the orthodontic device ranges from 0.5 to 1.5 mm.

[0032] Optionally, the dental arch appliance may further include an occlusal pad or an occlusal plate, wherein the occlusal pad or the occlusal plate is integrally formed with the shell-like body;

[0033] Alternatively, the jaw pad or jaw plate may be integrated with the shell-like body by bonding, welding, riveting, or fusion.

[0034] Optionally, the dental arch appliance further includes an expander connected to the shell-shaped body and / or the extension.

[0035] A dental arch orthodontic system comprising a plurality of dental arch appliances, wherein the dental arch appliances are as described above.

[0036] In this approach, multiple dental arch appliances can be used to correct the dental arch step by step to achieve the final corrective effect. By adopting the above-described structure of the dental arch appliances, the moment of inertia of the appliances in the occlusal projection direction can be increased, thereby improving the rigidity of the appliances in the direction of force application to the dental arch.

[0037] Optionally, multiple dental arch appliances may be used, with each step corresponding to an arch expansion design of 0.1-0.5 mm.

[0038] A method for orthodontic treatment, comprising an orthodontic appliance as described above:

[0039] A first design model for obtaining a tooth model, the first design model including an initial crown model and an initial oral mucosal tissue model;

[0040] Based on the target position of the dental arch treatment, a dental arch treatment plan is designed, which includes the number of dental arch treatment steps and the amount of dental arch movement corresponding to the number of dental arch treatment steps;

[0041] Based on the dental arch movement in at least one step, the oral mucosal tissue model of the first orthodontic step is updated to obtain a second tooth design model for the first orthodontic step; the first orthodontic step is one of the at least one steps; the second tooth design model is used to manufacture the dental arch appliance.

[0042] In this approach, the oral mucosal tissue model can be updated during the orthodontic treatment, thereby improving the orthodontic performance of the orthodontic appliance. Furthermore, the updated oral mucosal tissue model can be adapted to the orthodontic needs of the first orthodontic step, thus enhancing the overall orthodontic effect of the orthodontic appliance.

[0043] Optionally, the oral mucosal tissue model of the first orthodontic step is updated based on the dental arch movement of at least one step to obtain a second tooth design model for the first orthodontic step, wherein the first orthodontic step is one of the at least one steps; including:

[0044] Determine the update region of the oral mucosal tissue model, wherein the update region is a portion of the oral mucosal tissue region;

[0045] Based on the updated region and the correction design amount of the first correction step, determine the deformation parameters of the updated region;

[0046] Based on the deformation parameters of the updated region, the second tooth design model for the first orthodontic step is determined.

[0047] In this scheme, the oral mucosal tissue model can be divided into update regions, and the deformation parameters of these update regions are related to the orthodontic design amount of the first orthodontic step. This allows for more refined updates to the oral mucosal tissue model as needed, further improving the orthodontic effect.

[0048] Optionally, the updated region includes at least one of the following:

[0049] The area where the mid-palatal suture is located,

[0050] The area where the gingival margin is located.

[0051] The area outside the mid-palatal suture region.

[0052] Area outside the gingival margin

[0053] The area outside the mid-palatal suture and the gingival margin.

[0054] Optionally, the updated region includes the region where the mid-palatal suture is located, the region where the gingival margin is located, and the region outside the region where the mid-palatal suture is located and the gingival margin.

[0055] The oral mucosal tissue model of the first orthodontic step is updated based on the dental arch movement amount of at least one step to obtain a second tooth design model for the first orthodontic step, wherein the first orthodontic step is one of the at least one steps; including:

[0056] The area containing the mid-palatal suture, the area containing the gingival margin, and the area outside the mid-palatal suture and the gingival margin are respectively designated as the first region, the second region, and the third region.

[0057] Based on the correction design amount of the first region, the second region, the third region and the first correction step, the deformation parameters of the first region, the second region and the third region are determined as the first deformation parameter, the second deformation parameter and the third deformation parameter, respectively.

[0058] The oral mucosal tissue model of the first orthodontic step is updated based on the first deformation parameter, the second deformation parameter, and the third deformation parameter.

[0059] Based on the updated oral mucosal tissue model and the amount of dental arch movement in the first orthodontic step, the second tooth design model for the first orthodontic step is obtained.

[0060] In this scheme, the oral mucosal tissue model is divided into the area where the mid-palatal suture is located, the area where the gingival margin is located, and the area outside the mid-palatal suture and the gingival margin. This division of the area can adapt to the orthodontic needs of dental arch treatment. Furthermore, by setting the deformation of the first, second, and third deformation parameters, different deformations can be made to these areas of the oral mucosal tissue model, which is more in line with the physiological structure of the oral cavity and can optimize the application of orthodontic force.

[0061] Optionally, determining the deformation parameters of the first, second, and third regions based on the correction design amount of the first region, the second region, the third region, and the first correction step, namely the first deformation parameter, the second deformation parameter, and the third deformation parameter, includes:

[0062] The first deformation parameter is determined based on the correction design amount of the first region and the first correction step;

[0063] The second deformation parameter is determined based on the correction design amount of the second region and the first correction step;

[0064] The third deformation parameter is determined based on the first distance between the third region and the first region, the second distance between the third region and the second region, the first deformation parameter, and the second deformation parameter.

[0065] In this scheme, the third deformation parameter can be related to the distance and deformation parameters of the first and second regions, thereby enabling more precise design of the third deformation parameter and making the deformation between the regions more coordinated.

[0066] Optionally, the first design model for obtaining the tooth model includes an initial crown model and an initial oral mucosal tissue model, comprising:

[0067] The model obtained by taking the impression is received and processed to generate a three-dimensional model of the crown and oral mucosal tissue. The three-dimensional model is used as the first design model, wherein the oral mucosal tissue includes at least the oral mucosal tissue in the area of ​​the lingual gingival margin more than 2 mm away.

[0068] Optionally, the step of designing a dental arch treatment plan based on the target position of the dental arch treatment includes the number of dental arch treatment steps and the corresponding dental arch movement, including:

[0069] In the same orthodontic step, the amount of dental arch movement of teeth in the distal direction is greater than or equal to the amount of dental arch movement of teeth in the mesial direction.

[0070] Optionally, the second tooth design model includes at least one of an orthodontic appliance mold model and an orthodontic appliance model for 3D printing.

[0071] A method for generating a dental arch appliance, the method comprising the dental arch treatment method described above, the method comprising:

[0072] The dental arch appliance is generated based on the second tooth design model.

[0073] Optionally, the second tooth design model includes at least one of an orthodontic appliance mold model and an orthodontic appliance model;

[0074] When the second tooth design model is an orthodontic appliance model, the dental arch appliance is generated by 3D printing.

[0075] When the second tooth design model is an orthodontic appliance mold model, the orthodontic appliance mold model is generated, and the dental arch appliance is generated based on the orthodontic appliance mold model.

[0076] The positive and progressive effects of this utility model are as follows: by changing the shape of the orthodontic appliance to enhance its rigidity, specifically by providing an extension portion on the lingual edge of at least one tooth, the cutting line of the shell-like body on the lingual edge can be extended, increasing the moment of inertia of the orthodontic appliance in the direction of projection on the maxillofacial surface, thereby improving the rigidity of the orthodontic appliance in the direction of force application to the dental arch. Attached Figure Description

[0077] Figure 1 A schematic diagram of the structure of a dental arch appliance is provided for embodiment 1;

[0078] Figure 2 A schematic diagram of another dental arch appliance provided for embodiment 1;

[0079] Figure 3 A schematic diagram of another dental arch appliance provided for embodiment 1;

[0080] Figure 4 This is a schematic diagram of another dental arch appliance provided in Example 1;

[0081] Figure 5 This is a schematic diagram of another dental arch appliance provided in Example 1;

[0082] Figures 6-9 This is a diagram illustrating the effects of different stages of bow expansion, in which... Figure 6 This is a schematic diagram of the dental arch in the first stage. Figure 7 This is a schematic diagram of the dental arch in the second stage. Figure 8 This is a schematic diagram of the third stage dental arch. Figure 9 This is a schematic diagram of the dental arch in the fourth stage;

[0083] Figure 10 A flowchart illustrating a dental arch correction method provided in this embodiment of the present invention;

[0084] Figure 11 This is a schematic diagram illustrating the division of an updated region in an oral mucosal tissue model, as provided in an embodiment of the present invention.

[0085] Explanation of reference numerals in the attached figures

[0086] Orthodontic appliance 100, shell-shaped body 110, extension 120, extension margin 121, reinforcing rib 122, tooth 200, dentition direction 210, lingual gingival margin 220, mesial direction M, distal direction D. Detailed Implementation

[0087] The present invention will be further described below by way of embodiments, but the present invention is not limited to the scope of the embodiments described herein.

[0088] Example 1

[0089] This embodiment provides a dental arch appliance 100, such as Figures 1-5 As shown, the orthodontic appliance 100 includes a shell-shaped body 110, which is used to fit over the crown of the tooth 200 along the dentition direction 210. The appliance 100 also includes an extension 120, which connects to the lingual edge of the shell-shaped body 110 in the height direction of the tooth 200 and extends beyond the lingual gingival margin 220 in a direction away from the cusp. In the dentition direction 210, the extension 120 is arranged around the lingual edge of at least one tooth, and the extension is used to assist in orthodontic treatment. By changing the shape of the appliance 100 to enhance its rigidity, specifically by providing the extension 120 on the lingual edge of at least one tooth, the cutting line of the shell-shaped body 110 at the lingual edge can be lengthened, increasing the moment of inertia of the appliance 100 in the occlusal projection direction, thereby improving the rigidity of the appliance 100 in the direction of force application to the dental arch.

[0090] The shell-shaped body 110 can be the orthodontic appliance 100 in the prior art, mainly fitted onto the crown of the tooth and basically consistent with the dentition of the tooth 200. The lingual edge of the shell-shaped body 110 is usually close to the gingiva. The extension portion 120 extends the lingual edge of the shell-shaped body 110, so that the lingual edge of the orthodontic appliance 100 can be extended in the dentition direction 210 and exceed the gingival margin. The extension portion 120 corresponding to the posterior tooth region can perform arch expansion orthodontic treatment on the posterior teeth; the extension portion 120 corresponding to the anterior tooth region can perform orthodontic treatment on the anterior teeth, and also helps to strengthen the orthodontic force in the posterior tooth regions on both sides, and improve the overall rigidity of the orthodontic appliance 100. Thus, in arch expansion orthodontic treatment, the inner side of the orthodontic appliance 100 in this embodiment can provide stronger orthodontic force.

[0091] During orthodontic treatment, the above concept can be used for both arch expansion and arch reduction. In conventional arch treatment, arch expansion is usually the preferred method. This embodiment uses arch expansion as an example, and the specific implementation method will be further explained below. The teeth to be expanded can be upper or lower teeth; in conventional arch treatment, upper teeth are typically expanded. Furthermore, the expanded teeth are generally posterior teeth, including premolars and molars.

[0092] Extension 120 satisfies any of the following:

[0093] When the shell-shaped body 110 is fitted onto the upper tooth, the distance between the extended edge 121 of the extension portion 120 and the lingual gingival margin 220 is more than 2 mm.

[0094] When the shell-shaped body 110 is fitted onto the upper tooth, the distance between the extended edge 121 of the extension portion 120 and the lingual gingival margin 220 is 3-10 mm.

[0095] like Figure 3 , Figure 4 and Figure 5 As shown, the extension 120 covers the entire maxillary tissue;

[0096] When the shell-shaped body 110 is fitted onto the lower tooth, the distance between the extended edge 121 of the extension portion 120 and the gingival margin ranges from 2 to 5 millimeters.

[0097] like Figure 1 and Figure 2As shown, the extension length of the extension portion 120 in the anterior tooth region is greater than its extension length in the posterior tooth region. In one specific embodiment, in the anterior tooth region, the distance between the extension edge 121 of the extension portion 120 and the lingual gingival margin 220 is 8-10 mm; in the posterior tooth region, the distance is 5-8 mm. This allows the extension portion 120 to provide greater rigidity in the anterior tooth region, improving the overall structural strength of the orthodontic appliance 100 and enhancing the orthodontic effect. In other embodiments, the extension length of the extension portion 120 in the anterior tooth region and the extension length in the posterior tooth region can be the same.

[0098] The expansion design amount of the orthodontic appliance 100 in the distal direction D is greater than or equal to the expansion design amount in the mesial direction M. This allows it to adapt to the shape of the dental arch and improve the expansion effect. Preferably, the expansion design amount of the orthodontic appliance 100 in the distal direction D is greater than the expansion design amount in the mesial direction M.

[0099] The direction of arch expansion is the movement from the current position towards the cheek, and the design amount of arch expansion is the design amount of movement from the current position towards the cheek. For example... Figure 6 As shown, the distal direction D and the mesial direction M are relative concepts. With the midline as the reference, the direction closer to the midline is mesial direction M, and the direction farther from the midline is distal direction D. Therefore, along the midline, the closer the teeth are to the larynx (200), the greater the arch expansion design amount.

[0100] The extension 120 has a first region extending beyond the lingual gingival margin 220, at least a portion of which contacts the oral mucosa. This first region contacts the oral mucosa to abut against it, enhancing the orthodontic effect when the appliance 100 is used.

[0101] When the lingual edge of the shell-like body 110 is level with the lingual gingival margin 220, the extension 120 constitutes the first region; when the lingual edge of the shell-like body 110 is above the lingual gingival margin 220, the portion of the extension 120 below the lingual gingival margin 220 constitutes the first region. In actual implementation, the surface of this first region can be produced based on oral mucosal tissue, specifically by overmolding with oral mucosal tissue, such as... Figures 3-5 As shown, the outline in the first region indicates a fit with the oral mucosal components, resulting in better integration with the oral mucosal tissue. Figure 1 and Figure 2 As shown, the first region is roughly U-shaped; as Figure 3 , Figure 4 and Figure 5 As shown, the first region covers the maxillary tissue.

[0102] The extension portion 120 is provided with reinforcing ribs 122 along the buccal-lingual direction. This enhances the structural strength of the extension portion 120, thereby further improving the rigidity of the orthodontic appliance 100. Figure 2 and Figure 5 As shown, the reinforcing rib 122 can be a strip-shaped structure that protrudes into the oral cavity. There can be multiple reinforcing ribs 122, which are arranged at intervals along the midpalatal line.

[0103] like Figure 5 As shown, when the extension 120 covers the entire palatal tissue, the reinforcing rib 122 is located at the position opposite to the palatal tissue of the extension 120.

[0104] like Figure 2 As shown, when the extension 120 does not cover the entire maxillary tissue, the reinforcing rib 122 is located near the anterior teeth of the extension 120.

[0105] The extension 120 is an integral structure, such as Figure 3 As shown, the extension 120 extends in both the anterior and posterior tooth regions and is an integral structure that provides sufficient strength to improve orthodontic results.

[0106] like Figure 1-5 As shown, the extension 120 is integrally formed with the shell-shaped body 110.

[0107] In the area corresponding to the posterior teeth at the extension 120, the arch expansion design amount near the lingual gingival margin 220 is greater than that away from the lingual gingival margin 220. This allows for appropriate adjustments to the arch expansion design amount at different locations based on the structural characteristics of the oral cavity, which is beneficial for arch expansion orthodontic treatment.

[0108] In actual implementation, the surface of the extension 120 that contacts the palate has a concave-convex structure adapted to the oral mucosa. Taking these concave-convex structures as an example, the expansion design amount of the concave-convex structure farther from the mid-maxillary line is greater than that of the concave-convex structure closer to the midline. Specifically, during manufacturing, the concave-convex structure itself may remain unchanged, but the position of the concave-convex structure may be moved away from the mid-maxillary line, with the distance of movement being greater the farther away from the mid-maxillary line.

[0109] The extension 120 is detachably or fixedly connected to a reinforcing part (not shown in the figure), the elastic modulus of which is greater than that of the extension 120. Compared to the shell-shaped body 110 or the extension 120, the reinforcing part has a higher elastic modulus, which makes the orthodontic appliance 100 have a higher corrective force.

[0110] In a specific implementation, the extension 120 may have a reinforcement mounting area. The reinforcement is an object with resilience, whose elastic modulus is greater than that of the rest of the part. It may be made of materials such as steel wire or spring sheet, wherein the spring sheet may be a metal spring sheet or a plastic spring sheet with a higher elastic modulus. The reinforcement and the extension 120 may be detachably installed or fixedly installed. For example, the mounting area may be a cavity on the extension 120 into which the reinforcement is embedded; or, for another example, the reinforcement may be directly bonded to the mounting area of ​​the extension 120.

[0111] The shell-shaped body 110 has an opening (not shown in the figure) at the position corresponding to the tooth cusp. This allows saliva to drain out of the cavity formed by the appliance 100.

[0112] The extension length of appliance 100 on the labial / buccal side is less than its extension length on the lingual side. For example... Figure 3 As shown, the shell-shaped body 110 has a shorter sidewall on the labial and buccal side, located above the labial gingival margin. The shell-shaped body 110 has a sidewall on the lingual side close to the lingual gingival margin 220 and is connected to an extension portion 120. Thus, the orthodontic appliance 100 as a whole forms a shape that is short on the outer side and long on the inner side, thereby having a greater corrective force on the inner side, which is beneficial for arch expansion correction.

[0113] The thickness of the diaphragm of the orthodontic appliance 100 ranges from 0.5 to 1.5 mm, preferably from 0.75 to 1.2 mm.

[0114] The dental arch appliance 100 also includes an occlusal pad or occlusal plate, which is integrally formed with the shell-shaped body 110; or, the occlusal pad or occlusal plate is integrated with the shell-shaped body 110 by means of bonding, welding, riveting or fusion.

[0115] The dental arch appliance 100 also includes an expander connected to the shell-shaped body 110 and / or the extension 120 to achieve combined treatment.

[0116] Example 2

[0117] This embodiment also provides a dental arch orthodontic system, which includes multiple dental arch appliances 100, which are the dental arch appliances 100 as described in Embodiment 1 above. Multiple dental arch appliances 100 can correct the dental arch step by step to achieve the final corrective effect. By adopting the above-described structure of the dental arch appliances 100, the moment of inertia of the appliances 100 in the occlusal projection direction can be increased, thereby improving the rigidity of the appliances 100 in applying force to expand the arch.

[0118] like Figure 6 , Figure 7 , Figure 8 and Figure 9As shown, during the orthodontic treatment of tooth 200, multiple orthodontic appliances 100 are typically used to gradually correct the tooth 200 to the desired shape. Each of the multiple arch appliances 100 has an arch expansion design amount of 0.1-0.5 mm, preferably 0.2-0.3 mm.

[0119] Both the dental arch appliance 100 in Example 1 and the dental arch orthodontic system in this example can achieve simultaneous expansion of the arch and alignment of the teeth 200.

[0120] Example 3

[0121] This embodiment provides a method for orthodontic treatment, including an orthodontic appliance 100 as described in Embodiment 1 above, such as... Figure 10 As shown, this orthodontic method includes the following steps:

[0122] S100: The first design model for obtaining a tooth model, which includes an initial crown model and an initial oral mucosal tissue model.

[0123] S200: Design an orthodontic treatment plan based on the target position of the dental arch. The orthodontic treatment plan includes the number of orthodontic steps and the corresponding amount of dental arch movement.

[0124] S300: Based on the dental arch movement of at least one step, the oral mucosal tissue model of the first orthodontic step is updated to obtain the second tooth design model of the first orthodontic step; the first orthodontic step is one of at least one steps; the second tooth design model is used to manufacture the dental arch appliance.

[0125] Orthodontic treatment typically involves multiple steps. For any step of the orthodontic treatment, i.e., the first step, in addition to designing the tooth model based on the corresponding arch movement, the oral mucosal tissue model for the first step is also updated. When manufacturing the orthodontic appliance 100 based on this updated second tooth design model, the appliance 100 can have a shell-like body 110 and an extension 120. The extension 120 increases the moment of inertia of the appliance 100 in the occlusal projection direction, thereby improving the rigidity of the appliance 100 in the direction of arch force application, and thus enhancing orthodontic performance. Furthermore, the updating of the oral mucosal tissue model, based on at least one arch movement, can adapt to the orthodontic needs of the first step, thereby improving the overall orthodontic effect of the orthodontic appliance 100. The amount of dental arch movement based on at least one step can be the amount of dental arch movement corresponding to the first orthodontic step, or it can be determined by combining the dental arch movement amounts of multiple steps near the first orthodontic step.

[0126] As one implementation method, step S100 specifically includes: receiving the model obtained by taking an impression, processing it to generate a three-dimensional model of the tooth crown and oral mucosa tissue, and using the three-dimensional model as the first design model.

[0127] In practice, impression taking can be performed using methods such as intraoral scanning or silicone impressions. The impression site includes the initial crowns of the teeth and the initial oral mucosa of the oral cavity to be treated; the oral mucosa must include at least 2 mm or more of the oral mucosa along the lingual gingival margin. The initial crowns and oral mucosa can be maxillary, mandibular, or both. When the initial crowns and oral mucosa are maxillary, it is preferable to take an impression of the entire maxillary oral mucosa.

[0128] In one implementation, step S200 specifically includes: in the same orthodontic step, the orthodontic movement of the distal D upper teeth 200 is greater than or equal to the orthodontic movement of the mesial M upper teeth 200. Preferably, the orthodontic movement of the distal D upper teeth 200 is greater than the orthodontic movement of the mesial M upper teeth 200.

[0129] As one implementation method, step S300 specifically includes:

[0130] S311: Determine the update region of the oral mucosal tissue model, wherein the update region is a portion of the oral mucosal tissue region. In practice, the update region of the oral mucosal tissue model may be a portion or all of the oral mucosal tissue region. The update region includes at least one of the following: the region containing the mid-palatal suture, the region containing the gingival margin, the region outside the region containing the mid-palatal suture, the region outside the gingival margin, and the region outside both the region containing the mid-palatal suture and the gingival margin.

[0131] S312: Determine the deformation parameters of the updated area based on the orthodontic design amount of the updated area and the first orthodontic step. The orthodontic design amount of the first orthodontic step can be the amount of arch movement corresponding to the first orthodontic step, or it can be determined by combining the arch movements of multiple steps surrounding the first orthodontic step. In practice, the deformation parameters are positively correlated with the orthodontic design amount of the first orthodontic step. Taking arch expansion as an example, this deformation parameter is the value or proportion of the stretching deformation along the expansion direction.

[0132] S313: Based on the deformation parameters of the updated region, determine the second tooth design model for the first orthodontic step. Each updated region undergoes deformation simulation based on its corresponding deformation parameters to generate moving oral mucosal tissue. The second tooth design model includes at least one of a mold model of the orthodontic appliance 100 for 3D printing and a model of the orthodontic appliance 100.

[0133] The following example, using the area to be updated as including the region containing the mid-palatal suture, the region containing the gingival margin, and the region outside the mid-palatal suture and gingival margin, further illustrates the orthodontic method of this invention. Step S300 specifically includes the following steps:

[0134] S321: As Figure 11 As shown, the regions containing the palatal midline, the gingival margin, and the regions outside the palatal midline and gingival margin are respectively labeled as the first region t1, the second region t2, and the third region t3.

[0135] S322: Based on the correction design amount of the first region t1, the second region t2, the third region t3 and the first correction step, determine the deformation parameters of the first region t1, the second region t2 and the third region t3, which are respectively the first deformation parameter, the second deformation parameter and the third deformation parameter.

[0136] S323: Update the oral mucosal tissue model of the first orthodontic step based on the first deformation parameter, the second deformation parameter, and the third deformation parameter.

[0137] S324: Based on the updated oral mucosal tissue model and the amount of dental arch movement in the first orthodontic step, obtain the second tooth design model for the first orthodontic step. In practice, special designs may be added during the process of obtaining the second tooth design model, such as adding reinforcing rib 122 structures.

[0138] Preferably, the deformation parameter near the lingual gingival margin is greater than the deformation parameter far from the lingual gingival margin; that is, the second deformation parameter is greater than the third deformation parameter, and the third deformation parameter is greater than the first deformation parameter.

[0139] In practice, one of the first, second, and third deformation parameters can be related to at least one of the other two parameters. The following example, where the third deformation parameter is related to the first and second deformation parameters, further illustrates step S322:

[0140] S3221: Determine the first deformation parameter x1 based on the first region t1 and the correction design amount of the first correction step.

[0141] S3222: Determine the second deformation parameter x2 based on the second region t2 and the correction design amount of the first correction step.

[0142] S3223: Determine the third deformation parameter X based on the first distance s1 between the third region t3 and the first region t1, the second distance s2 between the third region t3 and the second region t2, the first deformation parameter x1, and the second deformation parameter x2. Specifically, X = f(x1, x2, s1, s2) can be configured for calculation, where f() is a calculation function that can be obtained through clinical validation or AI simulation.

[0143] Example 4

[0144] This embodiment provides a method for generating a dental arch appliance 100. The method for generating the dental arch appliance 100 includes the dental arch treatment method as described in Embodiment 3. The method for generating the dental arch appliance 100 includes:

[0145] S400: Generate dental arch appliance 100 based on the second tooth design model.

[0146] In practice, the second tooth design model includes at least one of the orthodontic appliance 100 mold model and the orthodontic appliance 100 model;

[0147] When the second tooth design model is the orthodontic appliance 100 model, the dental arch appliance 100 is generated by 3D printing.

[0148] When the second tooth design model is the mold model of appliance 100, the mold model of appliance 100 is generated, and the dental arch appliance 100 is generated based on the mold model of appliance 100.

[0149] While specific embodiments of this utility model have been described above, those skilled in the art should understand that these are merely illustrative examples, and the scope of protection of this utility model is defined by the appended claims. Those skilled in the art can make various changes or modifications to these embodiments without departing from the principles and essence of this utility model, but all such changes and modifications fall within the scope of protection of this utility model.

Claims

1. A dental arch appliance, the appliance comprising a shell-shaped body for fitting over the crowns of the teeth in a dental arch direction, characterised in that, The appliance further comprises an extension, The extension is connected to the lingual edge of the shell body in the height direction of the teeth and extends beyond the lingual gum line in a direction away from the cusp; in the dental arch direction, the extension is arranged around the lingual edge of at least one tooth, and the extension is used to assist in dental arch correction.

2. The dental arch appliance of claim 1, wherein, The extension satisfies any one of the following conditions: When the shell body is fitted on the upper teeth, the distance between the extension edge of the extension and the lingual gum line is greater than 2 mm; When the shell body is fitted on the upper teeth, the distance between the extension edge of the extension and the lingual gum line is 3-10 mm; The extension covers the entire upper palate tissue; When the shell body is fitted on the lower teeth, the distance between the extension edge of the extension and the gum line ranges from 2-5 mm.

3. The dental arch appliance of claim 1, wherein, The extension has a greater extension length in the anterior region than in the posterior region; And / or, the appliance has a greater expansion design in the distal direction than in the proximal direction.

4. The dental arch appliance of claim 1, wherein, The extension has a first region that extends beyond the lingual gum line, and at least a portion of the first region is in contact with the oral mucosa.

5. The dental arch appliance of claim 1, wherein, The extension is provided with a reinforcing rib in the buccal-lingual direction; When the extension covers the entire upper palate tissue, the reinforcing rib is located at a position opposite the upper palate of the extension; Or, when the extension does not cover the entire upper palate tissue, the reinforcing rib is located at a position close to the anterior teeth of the extension.

6. The dental arch appliance of claim 1, wherein, The extension is of a unitary structure, and / or the extension is integrally formed with the shell body.

7. The dental arch appliance of claim 1, wherein, In the region of the extension corresponding to the posterior teeth, the expansion design close to the lingual gum line is greater than the expansion design away from the lingual gum line.

8. The dental arch appliance of claim 1, wherein, The extension is detachably connected or fixedly connected with a reinforcing portion, and the elastic modulus of the reinforcing portion is greater than the elastic modulus of the extension.

9. The dental arch appliance of claim 1, wherein, The shell body is provided with an opening at a position corresponding to the cusp; And / or, the extension length of the appliance on the labial-buccal side is less than the extension length on the lingual side; And / or, the thickness of the membrane of the appliance ranges from 0.5-1.5 mm.

10. The dental arch appliance of any one of claims 1-9, wherein, The dental arch appliance further comprises a jaw pad or a jaw plate, The jaw pad or the jaw plate is integrally formed with the shell body; Or, the jaw pad or the jaw plate is integrally combined with the shell body by adhesion, welding, riveting or fusion.

11. The dental arch appliance of any one of claims 1-9, wherein, The dental arch appliance further comprises an expander connected to the shell body and / or the extension.

12. A dental arch correction system, comprising: The dental arch appliance system comprises a plurality of dental arch appliances, and each step of the plurality of dental arch appliances corresponds to an expansion design of 0.1-0.5 mm.

13. The dental arch treatment system of claim 12, wherein, The expansion design of each step of the plurality of dental arch appliances corresponds to an expansion design of 0.1-0.5 mm.

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