Dental cast, dental cast set, shell-like tooth aligner, and method for manufacturing the same

Abstract

The present application provides a dental model, a dental model set, a shell-shaped tooth appliance and a preparation method thereof. The dental model comprises a base. The geometry of the base is configured such that the average height from the bottom surface to the point on the sagittal plane where the highest cusp point of each tooth in the tooth model of the posterior tooth region on one side is projected is greater than the average height from the bottom surface to the point on the sagittal plane where the highest cusp point of each tooth in the tooth model of the posterior tooth region on the other side is projected. This configuration ensures that the thickness of the two shell-shaped tooth appliances obtained by pressing the two shell-shaped tooth appliances using the same film at the same time is substantially the same, thereby improving the preparation efficiency, reducing the production cost, and ensuring the correction effect of the shell-shaped tooth appliance.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of medical devices, and relates to a dental model, a dental model set, a shell-shaped tooth appliance and a preparation method thereof. BACKGROUND

[0002] Compared with traditional fixed appliances, invisible tooth appliances have certain advantages in orthodontic treatment, such as convenience in wearing and taking off, aesthetics, hygiene, etc. The preparation method of invisible tooth appliances is different from the common hot-pressing film forming method, and specifically includes the following steps: obtaining a digital model of the patient's mouth, 3D printing a dental model, cleaning the dental model, solidifying the dental model, pressing a film, manually removing the film, cutting, polishing, cleaning the dental appliance, inspection, packaging, etc. In the pressing process, the conventional preparation method is to press one dental model with one film sheet. At this time, the bottom of the dental model tends to be parallel to the plane on which it is placed, and the heights of the left and right sides of the dental model are basically the same, so that a semi-finished product of the shell-shaped tooth appliance is obtained. Then, the film is removed, cut, etc. However, the film sheet utilization rate is low, the operation frequency of pressing the film is increased, and the production efficiency is reduced.

[0003] In the prior art, the method for solving the above technical problem is to press two dental models with one film sheet. By setting the placement positions of the two dental models, two shell-shaped tooth appliances are pressed, so that the film sheet utilization rate is improved. However, in the pressing process of the two shell-shaped tooth appliances by the above method, since the two dental models are placed close to each other, the adjacent central region of the same film sheet is allocated by the concave-convex structures of the two dental models, so that the thickness of the shell-shaped tooth appliance pressed in the concentrated region of the dental model is different from that of the shell-shaped tooth appliance pressed in the dispersed region of the dental model. When the shell-shaped tooth appliance is worn on the patient's teeth, there is a deviation from the treatment plan, which affects the treatment effect.

[0004] Therefore, it is of great significance to study a dental model and a dental model set which can improve the film sheet utilization rate while ensuring that the thickness of the prepared shell-shaped tooth appliance meets the treatment requirements. SUMMARY

[0005] The technical problem to be solved by the present application is to overcome the defects in the prior art, and to provide a dental model, a dental model set, a shell-shaped tooth appliance and a preparation method thereof, which can ensure that the thickness of the obtained shell-shaped tooth appliance is basically the same when two shell-shaped tooth appliances are pressed with the same film sheet in the prior art.

[0006] The present application solves the above technical problems by the following technical solutions:

[0007] A dental model, comprising a tooth model and a gingival model arranged adjacent to the tooth model at a gum line, the tooth model comprising left and right posterior tooth region tooth models, the gingival model further comprising a base arranged distal to the tooth model, the base comprising a bottom surface, the base being geometrically configured such that the average height between the point on the sagittal plane of the highest cusp point of each tooth in the plurality of teeth comprised in the left posterior tooth region tooth model and the bottom surface is greater than the average height between the point on the sagittal plane of the highest cusp point of each tooth in the plurality of teeth comprised in the right posterior tooth region tooth model and the bottom surface.

[0008] Further, the base comprises a left base arranged distal to the left posterior tooth region tooth model and a right base arranged distal to the right posterior tooth region tooth model, the left base and the right base forming a base plane between the free end surfaces distal to the gingival model, and the base plane is arranged at an angle to the occlusal plane.

[0009] Further, the angle between the base plane and the occlusal plane is 1°-30°.

[0010] Further, the left base comprises a left base buccal region and a left base lingual region, the right base comprises a right base buccal region and a right base lingual region, and the maximum height of the left base buccal region on the sagittal plane is greater than the maximum height of the left base lingual region on the sagittal plane, and the maximum height of the right base lingual region on the sagittal plane is greater than the maximum height of the right base buccal region on the sagittal plane.

[0011] Or the maximum height of the left base buccal region on the sagittal plane is less than the maximum height of the left base lingual region on the sagittal plane, and the maximum height of the right base lingual region on the sagittal plane is less than the maximum height of the right base buccal region on the sagittal plane.

[0012] Further, the planes of the free ends of the left base and the right base are arranged parallel to the occlusal plane of the tooth model.

[0013] Further, the height of the left base on the sagittal plane is higher / lower than the height of the right base on the sagittal plane.

[0014] Further, the base is a hollow structure, and a support portion preventing deformation is arranged in the hollow structure.

[0015] Further, the height of the base is 0.3cm-1.0cm.

[0016] The present application also provides a dental model set for pressing two shell-shaped dental appliances on the same film, the dental model set comprising two dental models, wherein at least one of the dental models is the dental model according to any one of the preceding dental models; and the relative positions of the two dental models are as follows: the low side of the posterior tooth area of the base of one of the dental models is placed between the lingual sides of the left and right posterior tooth areas of the other dental model, so that the thicknesses of the two shell-shaped dental appliances wrapped around the teeth of the left and right posterior tooth areas are substantially the same.

[0017] Further, when both of the dental models are the dental model according to any one of the preceding dental models, the low side of the posterior tooth area of each of the two dental models is placed below the pressing film near the center.

[0018] Further, the distal end of the tooth on one side of the posterior tooth area of one of the dental models is located at the center of the line connecting the second premolar and the first molar on the left and right sides of the other dental model.

[0019] Further, the two dental models are the upper and lower dental models of the same patient.

[0020] The present application also provides a method for preparing a shell-shaped dental appliance, wherein the shell-shaped dental appliance is prepared by hot pressing a film, and the hot pressing process is performed on the dental model set according to any one of the preceding dental models, so that two shell-shaped dental appliances are simultaneously prepared, and the thicknesses of the two shell-shaped dental appliances wrapped around the teeth of the left and right posterior tooth areas are substantially the same.

[0021] The present application also provides a shell-shaped dental appliance prepared by the method according to the present application.

[0022] The present application also provides a dental model, comprising a tooth model and a gum model arranged near the gum margin of the tooth model, wherein the tooth model comprises left and right posterior tooth area tooth models, and the gum model is further provided with a base on the side away from the tooth model, and the base comprises a bottom surface, and the geometric structure of the base is configured such that the height between the point of the highest cusp point of any single tooth model in the posterior tooth area tooth model on one side projected to the sagittal plane and the bottom surface is greater than the height between the point of the highest cusp point of the corresponding single tooth model on the other side projected to the sagittal plane and the bottom surface.

[0023] Further, the base comprises a left base arranged below the left posterior tooth area tooth model and a right base arranged below the right posterior tooth area tooth model, and the free end surfaces of the left base and the right base on the side away from the gum model form a base plane, and the base plane is arranged at an angle with the occlusal plane.

[0024] Further, the base plane is angled 1-30° with the occlusal plane of the dental model.

[0025] Further, the left base comprises a left base buccal side area and a left base lingual side area; the right base comprises a right base buccal side area and a right base lingual side area; and the maximum height of the left base buccal side area projected to the sagittal plane is greater than the maximum height of the left base lingual side area projected to the sagittal plane, and the maximum height of the right base lingual side area projected to the sagittal plane is greater than the maximum height of the right base buccal side area projected to the sagittal plane.

[0026] Or the maximum height of the left base buccal side area projected to the sagittal plane is less than the maximum height of the left base lingual side area projected to the sagittal plane, and the maximum height of the right base lingual side area projected to the sagittal plane is less than the maximum height of the right base buccal side area projected to the sagittal plane.

[0027] Further, the plane of the free end of each of the left base and the right base is parallel to the occlusal plane of the dental model.

[0028] Further, the height of the left base projected to the sagittal plane is higher / lower than the height of the right base projected to the sagittal plane.

[0029] Further, the base is a hollow structure, and a support part preventing deformation is arranged in the hollow structure.

[0030] Further, the height of the base is 0.3-1.0 cm.

[0031] The present application also provides a dental model set for pressing two shell-shaped dental appliances on the same film sheet, which comprises two dental models, wherein at least one of the dental models is the dental model as described in any of the above embodiments; and the relative positions of the two dental models are as follows: the low side of the posterior tooth area of the base of one of the dental models is placed between the lingual sides of the left and right posterior tooth areas of the other dental model, so that the thickness of the two shell-shaped dental appliances wrapping the left and right posterior tooth areas is substantially the same.

[0032] Further, when both of the dental models are the dental models as described in any of the above embodiments, the low side of the base of the posterior tooth area of each of the two dental models is placed adjacent to the center position under the pressing film sheet.

[0033] Further, the last tooth of one side of the posterior tooth area of one of the dental models is located at the center of the line connecting the left and right second premolars / first molars of the other dental model.

[0034] Further, the two dental models are the upper and lower dental models of the same patient.

[0035] The application also provides a preparation method of the shell-shaped tooth appliance, which is prepared by using a hot-pressing film process.

[0036] The application also provides a shell-shaped tooth appliance prepared by using the preparation method.

[0037] Compared with the prior art, the application has at least the following beneficial effects:

[0038] In the dental arch model and the dental arch model set, the average height from the point where the highest cusp point of each tooth in the tooth model of the posterior tooth region on one side is projected to the sagittal plane to the bottom surface is greater than the average height from the point where the highest cusp point of each tooth in the tooth model of the posterior tooth region on the other side is projected to the sagittal plane to the bottom surface, which can make the highest points of the tooth models on the left and right sides of the dental arch model different.

[0039] In the shell-shaped tooth appliance and the preparation method thereof, the dental arch model and the dental arch model set are used, and the thickness of the two shell-shaped tooth appliances prepared by using the same film is basically the same.

[0040] In another dental arch model and dental arch model set, the height from the point where the highest cusp point of any single tooth model in the tooth model of the posterior tooth region on one side is projected to the sagittal plane to the bottom surface is greater than the height from the point where the highest cusp point of the corresponding single tooth model on the right side is projected to the sagittal plane to the bottom surface.

[0041] The present application provides another shell-shaped tooth appliance and its preparation method, wherein the above-mentioned dental arch model and dental arch model set are used, and the thickness of the two shell-shaped tooth appliances wrapping the teeth of the left and right posterior teeth is basically the same. BRIEF DESCRIPTION OF DRAWINGS

[0042] Figure 1 The structure diagram of one of the dental arch models 10 in the embodiment of the present application.

[0043] Figure 2 The structure diagram of the dental arch model 10 in the embodiment of the present application, wherein the bottom surface of the dental arch model 10 is at an angle with the occlusal plane.

[0044] Figure 3 The structure diagram of another dental arch model 10 in the embodiment of the present application.

[0045] Figure 4 The structure diagram of another dental arch model 10 in the embodiment of the present application.

[0046] Figure 5 The structure diagram of the dental arch model set in the embodiment of the present application.

[0047] Figure 6 The structure diagram of the shell-shaped tooth appliance in the embodiment of the present application. Figure 5 The side view of the shell-shaped tooth appliance in the embodiment of the present application.

[0048] Figure 7 The structure diagram of the shell-shaped tooth appliance in the embodiment of the present application.

[0049] Figure 8 The structure diagram of one of the dental arch models 20 in the embodiment of the present application.

[0050] Figure 9 The structure diagram of the dental arch model 20 in the embodiment of the present application, wherein the bottom surface of the dental arch model 20 is at an angle with the occlusal plane.

[0051] Figure 10 The structure diagram of another dental arch model 20 in the embodiment of the present application.

[0052] Figure 11 The structure diagram of another dental arch model 20 in the embodiment of the present application. EMBODIMENT

[0053] In order to make the objects, technical solutions and advantages of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all the other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present application. Unless otherwise defined, the technical terms or scientific terms used herein should be understood as the common meanings of the same by those of ordinary skill in the art. The similar words such as "comprise" used herein mean that the elements or objects before the words cover the elements or objects listed after the words and their equivalents, and do not exclude other elements or objects.

[0054] In the preparation of the invisible tooth appliance, when the hot pressing method is used, a film is usually used to press one dental arch model, which not only makes the film utilization rate low, but also increases the frequency of pressing operation and reduces the production efficiency. When one film is used to press two dental arch models, the two dental arch models need to be placed according to a certain relative position, and finally two shell-shaped tooth appliances are pressed under the premise of the maximum film utilization rate. The thickness of the two shell-shaped tooth appliances prepared by the above method is prone to uneven phenomenon. The present application improves the structure of the dental arch model, so that the dental arch model has an inclined effect when placed on a plane. When two shell-shaped tooth appliances are pressed, the dental arch model near the center of the film is lower in whole, and the dental arch model near the edge of the film is higher in whole, so that the thickness of the two shell-shaped tooth appliances prepared finally is basically the same, and the same or similar effect as the treatment plan is realized after the patient wears them.

[0055] The following is an explanation of the technical terms used. The "posterior region" is defined according to the tooth classification in the 2nd edition of *Introduction to Stomatology*, published by Peking University Medical Press, pages 36-38. It includes premolars and molars, marked as 4-8 in the FDI notation. Specifically, the unilateral posterior region includes the first premolar, second premolar, first molar, second molar, and third molar. The anterior region includes teeth marked as 1-3 in the FDI notation, specifically the central incisors, lateral incisors, and canines. For a single tooth, it is divided into lingual and labial / buccal surfaces, and mesial and distal surfaces. The "lingual surface" is defined according to the naming of the crown surfaces in the 2nd edition of *Introduction to Stomatology*, published by Peking University Medical Press, pages 35-36. The labial and buccal surfaces are the surfaces of the crowns of anterior teeth that are closest to the lips, called the labial surface; the buccal surfaces are the surfaces of the crowns of posterior teeth that are closest to the buccal surface. The lingual surface is the surface of the crowns of both anterior and posterior teeth that is closest to the tongue. The mesial and distal surfaces are the two surfaces of a tooth crown that connect with adjacent teeth, collectively called the proximal surfaces. The surface closer to the facial midline is called the mesial surface, and the surface farther from the facial midline is called the distal surface.

[0056] Example

[0057] A dental model 10, such as Figure 1 As shown, the model includes a tooth model 101 and a gingival model 102 located near the gingival margin of the tooth model. The tooth model 101 includes tooth models of the left and right posterior tooth regions. The gingival model also has a base 103 on the side away from the tooth model. The base includes a bottom surface. The geometry of the base 103 is designed such that the highest tooth of each tooth in the tooth model of one side of the posterior tooth region is positioned so that the highest tooth of each tooth is positioned so that the tooth model of one side of the posterior tooth region ...

[0058] ˉ

[0059] The average height H1 between the projection of the cusp onto the sagittal plane and the base is greater than the height between the projection of the highest cusp onto the sagittal plane and the base of the highest cusp of each tooth in the tooth model of the other posterior region.

[0060] ˉ

[0061] The average height H2 between them. More specifically, the dental model 101 includes anterior dental models and left and right posterior dental models, wherein the left or right posterior dental model includes multiple dental models, each with the highest cusp point. When the height of the base is different, it will cause the left and right posterior dental models to tilt. When the same membrane is used to press the two dental models at the same time, the thickness of the two shell-shaped orthodontic appliances can be made to be basically the same.

[0062] In other implementations, such as Figures 2-3As shown, the base 103 includes a left base 1031 arranged below the left posterior teeth model and a right base 1032 arranged below the right posterior teeth model, the left base 1031 and the right base 1032 form a base plane P1 between the free end surfaces away from the gingival model, and the base plane P1 is arranged at an angle with the occlusal plane P2. In some more preferred embodiments, the angle between the base plane P1 and the occlusal plane P2 is 1°-30°. Taking a single dental model as an example, when the dental model 10 is placed on a plane, the base 103 is in contact with the plane, due to the different heights of the left base 1031 and the right base 1032 on the left and right sides of the base 103, the occlusal plane P2 formed by the dental models on the dental model 10 is tilted, that is, it forms an angle with the base plane P1. At this time, when another dental model is placed, the relatively lower side of the two dental models is placed at the center position of the pressing film, and the relatively higher side of the other dental model is prevented from being placed at the corresponding edge position of the pressing film, so that the use of different areas of the film tends to be average during the hot pressing film operation, and finally the thickness of the shell-shaped dental appliance prepared is basically the same. It should be noted that, due to the uneven structure of the occlusal surface of the dental model on the dental model, during the pressing process using the film with uniform thickness, the thickness of different areas of the shell-shaped dental appliance, such as the lip side, the tongue side, the mesial surface, the distal surface, and the occlusal surface of each point, is not completely the same, but the specific difference in thickness is small, so the thickness is considered to be basically the same.

[0063] In some specific embodiments, the left base 1031 includes a left base buccal side area and a left base lingual side area; the right base 1032 includes a right base buccal side area and a right base lingual side area; and the left base buccal side area projects to the maximum height H 11 greater than the maximum height H 12 of the left base lingual side area projected to the sagittal plane; the maximum height H 22 of the right base lingual side area projected to the sagittal plane is greater than the maximum height H 21 of the right base buccal side area projected to the sagittal plane; at this time, the whole dental model is tilted to the right side, and the whole dental model is very stable when placed in a tilted manner, and does not swing left and right during the hot pressing film process, so that the shell-shaped dental appliance pressed is consistent with the pressing plan. The dental model can also be arranged such that the maximum height H 11 of the left base buccal side area projected to the sagittal plane is less than the maximum height H 12 of the left base lingual side area projected to the sagittal plane; the maximum height H 22 of the right base lingual side area projected to the sagittal plane is less than the maximum height H 21At this time, the whole dental model is inclined to the left side, and this setting mode also makes the whole dental model very stable when placed. In actual use, when the overall height of the left side is greater than that of the right side, the right dental model can be placed at the position corresponding to the center of the diaphragm; when the overall height of the right side is greater than that of the left side, the left dental model can be placed at the position corresponding to the center of the diaphragm.

[0064] In other embodiments, as shown in FIG. 10, the planes of the free ends of the left base 1031 and the right base 1032 are parallel to the occlusal plane of the dental model. In other more preferred embodiments, the height H1' of the left base projected to the sagittal plane is higher / lower than the height H2' of the right base projected to the sagittal plane. This setting mode can also make the dental model inclined when placed, and in addition, this setting mode is relatively simple, only the left base and the right base need to be set to different heights, which is relatively convenient for design and preparation. Figure 4

[0065] In other embodiments, the base 103 is a hollow structure, and a support part preventing deformation is arranged in the hollow structure, wherein the support part can be a honeycomb support structure, or a support plate supported on the side of the base 103 adjacent to the bottom surface, to prevent the dental model from deforming when being vacuum adsorbed during the hot pressing of the diaphragm, thereby affecting the shape of the final prepared shell-shaped dental appliance and affecting the correction effect when worn by the patient. In other embodiments, the height of the base is 0.3-1.0 cm, and the height of the base can be set according to the actual pressing of the shell-shaped dental appliance, for example, when a diaphragm with a thickness of 0.75 mm is selected, the thickness of the final pressed shell-shaped dental appliance is between 0.3 mm and 0.6 mm, at this time, the height of the base can be set to be higher at the place where the shell-shaped dental appliance is relatively thin, and the height of the base can be set to be lower at the place where the shell-shaped dental appliance is relatively thick; in addition, the height of the base can also be set according to the position of the dental model, when the positions of the two dental models are relatively close, the thickness of the base can be set to be relatively low, and when the positions of the two dental models are relatively far, the thickness of the base can be set to be relatively high.

[0066] A dental model set for pressing two shell-shaped dental appliances on the same diaphragm, as shown in FIG. 1 and FIG. 2. Figure 5 and Figure 6 ​As shown, the dental model set comprises two dental models, at least one of which is the dental model 10 as described in any of the above embodiments; and the relative positions of the two dental models are: the low side of the posterior tooth area of the base of one of the dental models is placed between the lingual sides of the left and right posterior tooth areas of the other dental model, so that the thickness of the shell tooth correctors wrapping the teeth of the left and right posterior tooth areas is substantially the same. In the pressing process of shell tooth correction, one of the above-mentioned dental models in any of the embodiments can be used alone, or two of the above-mentioned dental models in any of the embodiments can be used simultaneously, and the actual production needs can be selected for use. In one embodiment, when both of the dental models are the dental model as described in any of the above embodiments, the low side of the base corresponding to the posterior tooth area of both of the dental models is placed under the pressing film near the center position. At this time, the overall height of the center position of the film is relatively low and the film utilization rate of the dental model is relatively high, while the base corresponding to the posterior tooth area of the dental model near the edge of the film is relatively high and the film utilization rate of the dental model is relatively low, so that the thickness of the finally prepared shell tooth corrector is substantially the same. In a more specific embodiment, the last tooth of the posterior tooth area of one side of the dental model is located at the center of the left and right second premolar / first molar connecting line of the other dental model. At this time, the relative position of the dental model set is relatively certain, and when a series of dental model sets are used to prepare two shell tooth correctors, the relative positions of the two dental models are substantially the same, and under the premise that the film pressed out of the shell tooth corrector is fully utilized, not only can a series of shell tooth correctors with substantially the same thickness be prepared, but also the dental model can be prevented from being covered by the film, so that the two shell tooth correctors prepared can be wrapped by the film, and the production rate of defective products is reduced.

[0067] In one embodiment, when two dental models are pressed simultaneously, the two dental models are upper and lower dental models of the same patient, and at this time, the shell tooth correctors pressed out are upper and lower shell tooth correctors of the same patient at the same step or different steps, which provides convenience for subsequent sorting and packaging. The specific placement and selection method can be placed according to actual processing needs.

[0068] The specific embodiment of the present application also provides a preparation method of a shell tooth corrector, which is prepared by a hot pressing film process, and in the hot pressing film process, one film is used to hot press and form on the dental model set as described in any of the above embodiments, and two shell tooth correctors are prepared at the same time, such as Figure 7The shell-shaped tooth appliance is shown, so that the thickness of the two shell-shaped tooth appliances wrapping the teeth on the left and right sides of the posterior teeth is basically the same. More specifically, the hot-pressing film preparation method of the shell-shaped tooth appliance adopts the same film to press two dental arch models, that is, a dental arch model set, for example, a 1.0 mm thick film is selected to press two dental arch models, one of which has a base with a thickness of 0.3 mm on one side and a thickness of 0.6 mm on the other side, and the average height of the highest tooth tip of each tooth in the posterior teeth model on one side of the dental arch model from the projection of the point to the sagittal plane to the bottom surface is 0.6 mm, which is greater than the average height of the highest tooth tip of each tooth in the posterior teeth model on the other side of the dental arch model from the projection of the point to the sagittal plane to the bottom surface, which is 0.32 mm; the other dental arch model has a base with a thickness of 0.35 mm on one side and a thickness of 0.7 mm on the other side, and the average height of the highest tooth tip of each tooth in the posterior teeth model on one side of the other dental arch model from the projection of the point to the sagittal plane to the bottom surface is 0.65 mm, which is greater than the average height of the highest tooth tip of each tooth in the posterior teeth model on the other side of the other dental arch model from the projection of the point to the sagittal plane to the bottom surface, which is 0.33 mm; when the two shell-shaped tooth appliances are prepared by hot pressing, the relatively lower side of the base of the two dental arch models is placed adjacent to the center of the film, and the relatively higher side of the base of the two dental arch models is placed adjacent to the edge of the film, so that the thickness of the shell-shaped tooth appliance wrapping the tooth model part tends to be uniform.

[0069] The specific embodiment of the present application also provides a shell-shaped tooth appliance prepared by the above preparation method. The shell-shaped tooth appliance prepared by pressing two dental arch models with one film not only ensures that its correction performance is consistent with the correction plan, but also improves the preparation efficiency of the shell-shaped tooth appliance, improves the utilization rate of the film, and reduces the production cost.

[0070] The present application provides another embodiment of a dental arch model 20, as shown in Figures 8-10As shown, the dental model 201 includes left and right posterior tooth models, and the gingival model 202 is arranged adjacent to the gingival margin of the dental model 201. The gingival model 202 is further provided with a base 203 on the side away from the dental model 201. The base 203 includes a bottom surface. The geometry of the base 203 is configured such that the height H1 between the highest cusp point of any single tooth model on the left side of the posterior tooth model and the point of projection of the highest cusp point onto the sagittal plane to the bottom surface is greater than the height H2 between the highest cusp point of any single tooth model on the right side of the posterior tooth model and the point of projection of the highest cusp point onto the sagittal plane to the bottom surface. More specifically, the dental model 201 includes anterior tooth models and left and right posterior tooth models. The left or right posterior tooth model includes a plurality of tooth models, more specifically, the left or right posterior tooth model includes a first premolar tooth model, a second premolar tooth model, a first molar tooth model, a second molar tooth model, and a third molar tooth model. The left and right tooth models are arranged correspondingly, i.e., the overall height of the left first premolar tooth model is compared with that of the right first premolar tooth model, the overall height of the left second premolar tooth model is compared with that of the right second premolar tooth model, the overall height of the left first molar tooth model is compared with that of the right first molar tooth model, the overall height of the left second molar tooth model is compared with that of the right second molar tooth model, the overall height of the left third molar tooth model is compared with that of the right third molar tooth model. The height H1 between the highest cusp point of any single tooth model on the left side of the posterior tooth model and the point of projection of the highest cusp point onto the sagittal plane to the bottom surface is greater than the height H2 between the highest cusp point of any single tooth model on the right side of the posterior tooth model and the point of projection of the highest cusp point onto the sagittal plane to the bottom surface; or the height H2 between the highest cusp point of any single tooth model on the right side of the posterior tooth model and the point of projection of the highest cusp point onto the sagittal plane to the bottom surface is greater than the height H1 between the highest cusp point of any single tooth model on the left side of the posterior tooth model and the point of projection of the highest cusp point onto the sagittal plane to the bottom surface. The above arrangement allows the left and right posterior tooth models to be inclined, and when the same film is used to press two dental models, the thickness of the two shell-shaped dental appliances can be substantially the same.

[0071] In another embodiment, the base 203 comprises a left base 2031 disposed under the left posterior teeth model and a right base 2032 disposed under the right posterior teeth model, the left base 2031 and the right base 2032 form a base plane P3 between the free end surfaces away from the gingival model 202, and the base plane P3 is disposed at an angle with the occlusal plane P4. In another more preferred embodiment, the angle β between the base plane P3 and the occlusal plane P4 of the teeth model is 1°-30°. Taking a single dental arch model as an example, when the dental arch model 20 is placed on a plane, the base 203 is in contact with the plane. Due to the different heights of the left base 2031 and the right base 2032 of the base 203, the occlusal plane P4 formed by the teeth models on the dental arch model is tilted, that is, it forms an angle with the base plane P3. At this time, when another dental arch model is placed, the relatively lower side of the two dental arch models is placed at the center position of the pressing film, and the relatively higher side of the other dental arch model is prevented from being placed at the edge position of the corresponding pressing film. When the hot pressing film operation is performed, the use of different areas of the film tends to be average, and finally the thickness of the prepared shell-shaped dental appliance is basically the same. It should be noted that due to the uneven structure of the occlusal surface of the teeth model on the dental arch model, during the pressing process using a film with uniform thickness, the thickness of different areas of the shell-shaped dental appliance, such as the lip side, the tongue side, the mesial surface, the distal surface, and the occlusal surface, is not completely the same, but the specific difference in thickness is small, so the thickness is considered to be basically the same.

[0072] In another embodiment, the left base 2031 comprises a left base buccal side area and a left base lingual side area; the right base 2032 comprises a right base buccal side area and a right base lingual side area; and the left base buccal side area projects to the maximum height H 31 greater than the maximum height H 32 of the left base lingual side area projected to the sagittal plane; the right base lingual side area projects to the maximum height H 41 greater than the maximum height H 42 of the right base buccal side area projected to the sagittal plane; at this time, the entire dental arch model is tilted to the right side, and the entire dental arch model is very stable when placed in a tilted manner, and does not swing left and right during the hot pressing film process, so that the pressed shell-shaped dental appliance is consistent with the pressing plan. The dental arch model can also be set such that the maximum height H 31 of the left base buccal side area projected to the sagittal plane is less than the maximum height H 32 of the left base lingual side area projected to the sagittal plane; the right base lingual side area projects to the maximum height H 41 less than the maximum height H 42At this time, the whole dental model is inclined to the left side, and this setting mode also makes the whole dental model very stable when placed. In actual use, when the overall height of the left side is greater than that of the right side, the right dental model can be placed at the position corresponding to the center of the diaphragm; when the overall height of the right side is greater than that of the left side, the left dental model can be placed at the position corresponding to the center of the diaphragm.

[0073] In other embodiments, as shown in FIG. 2, the base planes P3 corresponding to the tooth models of the left and right posterior tooth regions of the dental model 20 are parallel to the occlusal plane P4 of the tooth model. In other more preferred embodiments, the height H3' of the left base projected to the sagittal plane is higher / lower than the height H4' of the right base projected to the sagittal plane. This setting mode can also cause the dental model to be inclined when placed, and in addition, this setting mode is relatively simple, only the left and right bases need to be set to different heights, which is convenient for design and preparation. Figure 11 In other embodiments, the base 203 is a hollow structure, and a support part for preventing deformation is arranged in the hollow structure. The support part can be a honeycomb support structure, or a support plate supported on the side adjacent to the bottom surface of the base 103, to prevent deformation of the dental model when vacuum adsorbed during hot pressing of the film, which affects the shape of the final prepared shell-shaped dental appliance and the treatment effect when worn by the patient. In other embodiments, the height of the base is 0.3-1.0 cm, and the height of the base can be set according to the actual pressing of the shell-shaped dental appliance. For example, when a 0.75 mm thick film is selected, the thickness of the final pressed shell-shaped dental appliance is between 0.3 mm and 0.6 mm, at which time the height of the base can be set higher where the shell-shaped dental appliance is thinner, and the height of the base can be set lower where the shell-shaped dental appliance is thicker. In addition, the height of the base can also be set according to the position of the dental model. When the two dental models are placed close to each other, the thickness of the base can be set relatively low, and when the two dental models are placed far apart, the thickness of the base can be set relatively high.

[0074]

[0075] ​A dental model set for pressing two shell-shaped dental appliances on the same film, characterized in that the dental model set comprises two dental models, at least one of which is the dental model 20 of any of the above embodiments; and the relative positions of the two dental models are as follows: the low side of the posterior tooth area of the base of one of the dental models is placed between the lingual sides of the left and right posterior tooth areas of the other dental model, so that the thickness of the two shell-shaped dental appliances wrapping the teeth of the left and right posterior tooth areas is substantially the same. In the pressing process of the shell-shaped dental appliance, one dental model of any of the above embodiments can be used alone, or two dental models of any of the above embodiments can be used simultaneously, and the selection can be made according to actual production needs. In one embodiment, when both dental models are the dental model of any of the above embodiments, the low side of the base corresponding to the posterior tooth area of both dental models is placed below the pressing film near the center position. At this time, the overall height of the center position of the film is relatively low and the film utilization rate of the dental model is relatively high, while the dental model corresponding to the posterior tooth area of the base near the edge of the film is relatively high and the film utilization rate of the dental model is relatively low, so that the thickness of the final shell-shaped dental appliance is substantially the same. In a more specific embodiment, the last tooth of one side of the posterior tooth area of one of the dental models is located at the center of the left and right second premolar / first molar lines of the other dental model. At this time, the relative position of the dental model set is relatively certain, and when a series of dental model sets are used to prepare two shell-shaped dental appliances, the relative positions of the two dental models are basically the same, which not only makes the thickness of the series of shell-shaped dental appliances prepared basically the same, but also prevents the dental model from being covered by the film, so that the two shell-shaped dental appliances prepared can be wrapped by the film, reducing the production rate of defective products.

[0076] In one embodiment, when two dental models are pressed simultaneously, the two dental models are the upper and lower dental models of the same patient, and the shell-shaped dental appliances pressed at this time are the upper and lower shell-shaped dental appliances of the same patient at the same step or different steps, which provides convenience for subsequent sorting and packaging. The specific placement and selection method can be placed according to actual processing needs.

[0077] The embodiment of the present application also provides a preparation method of the shell-shaped tooth appliance, which is prepared by using a hot-pressing film process. In the hot-pressing film process, a film sheet is used to hot-press and form on the dental arch model set in any of the above embodiments, and two shell-shaped tooth appliances are simultaneously prepared, so that the thicknesses of the two shell-shaped tooth appliances wrapping the teeth in the left and right posterior tooth regions are substantially the same. More specifically, the hot-pressing film preparation method of the shell-shaped tooth appliance uses the same film sheet to press two dental arch models, i.e., to press the dental arch model set. For example, a 1.0 mm-thick film sheet is used for pressing, wherein the thickness of one side of the base of one dental arch model is 0.3 mm, the thickness of the other side of the base is 0.6 mm, the average height of the highest tooth cusp point of each tooth in the posterior tooth region of one side of the dental arch model from the projection of the point to the sagittal plane to the bottom surface is 0.6 mm, which is greater than the average height of the highest tooth cusp point of each tooth in the posterior tooth region of the other side of the dental arch model from the projection of the point to the sagittal plane to the bottom surface, i.e., 0.32 mm; the thickness of one side of the base of the other dental arch model is 0.35 mm, the thickness of the other side of the base is 0.7 mm, the average height of the highest tooth cusp point of each tooth in the posterior tooth region of the other dental arch model from the projection of the point to the sagittal plane to the bottom surface is 0.65 mm, which is greater than the average height of the highest tooth cusp point of each tooth in the posterior tooth region of the other side of the dental arch model from the projection of the point to the sagittal plane to the bottom surface, i.e., 0.33 mm; when the two shell-shaped tooth appliances are prepared by hot pressing, the relatively lower side of the base of each dental arch model is arranged at the center region adjacent to the film sheet, and the relatively higher side of the base of each dental arch model is arranged at the edge region adjacent to the film sheet. At this time, the thickness of the part of the shell-shaped tooth appliance wrapping the dental arch model tends to be uniform.

[0078] The embodiment of the present application also provides a shell-shaped tooth appliance, which is prepared by using the above preparation method. The shell-shaped tooth appliance prepared by using one film sheet to press two dental arch models not only ensures that the correction performance of the shell-shaped tooth appliance is consistent with the correction plan, but also improves the preparation efficiency of the shell-shaped tooth appliance, improves the utilization rate of the film sheet, and reduces the production cost.

[0079] Although the above describes the specific embodiments of the present application, those skilled in the art should understand that this is only an example, and the protection scope of the present application is defined by the appended claims. Those skilled in the art can make various changes or modifications to the embodiments without departing from the principles and essence of the present application, and these changes and modifications all fall within the protection scope of the present application.

Claims

1. A dental cast comprising a tooth cast and a gingival cast disposed adjacent to a gum line of the tooth cast, the tooth cast comprising left and right posterior tooth region tooth casts, characterized in that, The gingival model further comprises a base on the side away from the tooth model, the base comprising a bottom surface, the base being configured such that the average height between the highest cusp point of each tooth in the tooth model on one side of the posterior tooth region and the bottom surface is greater than the average height between the highest cusp point of each tooth in the tooth model on the other side of the posterior tooth region and the bottom surface; wherein the base comprises a left base configured to be positioned under the left posterior tooth region and a right base configured to be positioned under the right posterior tooth region, the left base and the right base forming a base plane between the free end surfaces of the left base and the right base on the side away from the gingival model, and the base plane is configured to form an angle with the occlusal plane; and wherein the angle between the base plane and the occlusal plane is 1°-30°.

2. The dental model according to claim 1, characterized in that The left base comprises a left buccal side region and a left lingual side region, and the right base comprises a right buccal side region and a right lingual side region; and the maximum height of the left buccal side region projected onto the sagittal plane is greater than the maximum height of the left lingual side region projected onto the sagittal plane, and the maximum height of the right lingual side region projected onto the sagittal plane is greater than the maximum height of the right buccal side region projected onto the sagittal plane. Or the maximum height of the left buccal side region projected onto the sagittal plane is less than the maximum height of the left lingual side region projected onto the sagittal plane, and the maximum height of the right lingual side region projected onto the sagittal plane is less than the maximum height of the right buccal side region projected onto the sagittal plane.

3. The dental model according to claim 1, characterized in that The free end surfaces of the left base and the right base are each configured to be parallel to the occlusal plane of the tooth model.

4. The dental model according to claim 3, characterized in that The height of the left base projected onto the sagittal plane is higher / lower than the height of the right base projected onto the sagittal plane.

5. The dental model according to claim 1, characterized in that The base is a hollow structure, and the hollow structure comprises a support portion configured to prevent deformation.

6. The dental model according to claim 1, characterized in that The height of the base is 0.3 cm-1.0 cm.

7. A dental model kit for pressing two shell-like dental aligners on the same sheet of film, characterized in that, The dental arch model set comprises two dental arch models, at least one of which is the dental arch model according to any one of claims 1-6; and the relative positions of the two dental arch models are as follows: the low side of the posterior tooth region of one of the dental arch models is positioned between the left and right posterior tooth regions of the other dental arch model, such that the thicknesses of the two shell-shaped tooth aligners wrapped around the left and right posterior tooth regions are substantially the same.

8. The dental model kit according to claim 7, characterized in that When both of the dental arch models are the dental arch model according to any one of claims 1-6, the low side of the posterior tooth region of each of the two dental arch models is positioned under the pressing film adjacent to the center position.

9. The dental model kit according to claim 8, characterized in that The last tooth on one side of the posterior tooth region of one of the dental arch models is positioned at the center of the line connecting the left and right second premolars / first molars of the other dental arch model.

10. The dental model kit according to claim 7, characterized in that The two dental arch models are the upper and lower dental arch models of the same patient.

11. A method of manufacturing a shell-like dental appliance, the shell-like dental appliance being manufactured using a thermoforming process, characterized in that, The hot pressing film process adopts a film to hot-press form on the dental model set as claimed in any one of claims 1-6, and simultaneously produces two shell-shaped dental appliances, so that the thickness of the two shell-shaped dental appliances wrapped around the teeth in the left and right posterior dental regions is substantially the same.

12. A shell-like dental appliance, characterized in that, The shell-shaped dental appliance is produced by the production method as claimed in claim 11.

13. A dental cast comprising a tooth cast and a gingival cast disposed adjacent to a gum line of the tooth cast, the tooth cast comprising left and right posterior tooth region tooth casts, characterized in that, The gingival model further comprises a base on the side away from the dental model, and the base comprises a bottom surface, and the geometry of the base is configured such that the height between the point of the highest cusp point of any single tooth model in the posterior dental region on one side projected to the sagittal plane and the bottom surface is greater than the height between the point of the highest cusp point of the corresponding single tooth model in the posterior dental region on the other side projected to the sagittal plane and the bottom surface; wherein the base comprises a left base arranged below the left posterior dental region and a right base arranged below the right posterior dental region, and a base plane is formed between the free end surfaces of the left base and the right base on the side away from the gingival model, and the base plane is arranged at an angle to the occlusal plane; and the angle between the base plane and the occlusal plane of the dental model is 1°-30°.

14. The dental model according to claim 13, characterized in that The left base comprises a left buccal side region and a left lingual side region, and the right base comprises a right buccal side region and a right lingual side region; and the maximum height of the left buccal side region projected to the sagittal plane is greater than the maximum height of the left lingual side region projected to the sagittal plane, and the maximum height of the right lingual side region projected to the sagittal plane is greater than the maximum height of the right buccal side region projected to the sagittal plane. Or the maximum height of the left buccal side region projected to the sagittal plane is less than the maximum height of the left lingual side region projected to the sagittal plane, and the maximum height of the right lingual side region projected to the sagittal plane is less than the maximum height of the right buccal side region projected to the sagittal plane.

15. The dental model according to claim 14, characterized in that The planes of the free ends of the left base and the right base are arranged parallel to the occlusal plane of the dental model.

16. The dental model according to claim 15, characterized in that The height of the left base projected to the sagittal plane is higher / lower than the height of the right base projected to the sagittal plane.

17. The dental model according to claim 13, characterized in that The base is a hollow structure, and a support portion is arranged in the hollow structure to prevent deformation.

18. The dental model according to claim 13, characterized in that The height of the base is 0.3 cm-1.0 cm.

19. A dental model kit for pressing two shell-like dental appliances on the same sheet of film, characterized in that, The dental model set comprises two dental models, at least one of which is the dental model as claimed in any one of claims 13-18; and the relative positions of the two dental models are as follows: the low side of the posterior dental region of the base of one of the dental models is arranged between the left and right posterior dental regions of the other dental model, so that the thickness of the two shell-shaped dental appliances wrapped around the teeth in the left and right posterior dental regions is substantially the same.

20. The dental model kit according to claim 19, characterized in that When both of the dental models are the dental model as claimed in any one of claims 13-18, the low side of the posterior dental region base of both of the dental models is arranged below the pressing film adjacent to the center position.

21. The dental model kit according to claim 20, characterized in that The last tooth of the posterior dental region of one of the dental models is arranged at the center of the line connecting the second premolar and the first molar of the left and right posterior dental regions of the other dental model.

22. The dental model kit according to claim 19, characterized in that The two dental models are upper and lower dental models of the same patient.

23. A method of manufacturing a shell-like dental appliance, the shell-like dental appliance being manufactured using a thermoforming process, characterized in that, The thermoforming process uses one film to thermoform the dental model set of any one of claims 19-22, and two shell-shaped dental aligners are simultaneously prepared, so that the thickness of the two shell-shaped dental aligners wrapping the teeth of the left and right posterior dental regions is substantially the same.

24. A shell-like dental appliance, characterized in that, The shell-shaped dental aligner is prepared by the preparation method of claim 23.

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