Tooth jaw model bottom support
By setting up groove structures and limiting parts on the base bracket of the jaw model, the problem of unfixed diaphragm is solved, the yield rate and production efficiency of invisible tooth orthodontic devices are improved, and the cost is reduced.
Patent Information
- Application Number
- CN202421540989.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-02
- Publication Date
- 2025-08-01
- Estimated Expiration
- 2034-07-02
AI Technical Summary
The existing jaw model bottom support cannot effectively fix the diaphragm during the membrane compression process, resulting in a decrease in the yield rate of invisible tooth orthodontics. High temperature or long-term heating can easily cause brittle cracks of the orthodontics, increasing costs.
A groove structure is arranged in the space surrounding the edge of the bottom support surface and the edge of the bottom surface of the tooth jaw model. The diaphragm is pressed into the groove during the hot-pressing process, and the diaphragm is restricted from being disengaged by the limiting part and the friction layer to avoid high temperature or long-term heating.
It improves the fixing effect of the diaphragm and the base support of the jaw model, improves the yield rate of invisible tooth orthodontic devices, avoids the brittle cracks of the orthodontic devices, and reduces production costs.
Smart Images
Figure CN223169821U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of dental orthodontics, more precisely, it relates to the manufacturing technology of dental instruments, especially to a dental model base. Background Art
[0002] In the technical field of dental orthodontics, due to advantages such as aesthetics, convenience, and being conducive to cleaning, invisible dental aligners based on polymer materials are becoming more and more popular. The invisible dental aligner is usually an integral shell, which forms a cavity for accommodating multiple teeth, and the geometric shape of this cavity basically matches these teeth under the corresponding layout.
[0003] Currently, in the automated processing of invisible dental aligners, it usually needs to go through processes such as dental model printing, membrane preparation, membrane pressing, dental aligner cutting, and cleaning. The specific membrane pressing process is as follows: First, place the printed dental model on the carrier plate of the membrane pressing equipment. Secondly, place the membrane to be pressed on the heater for preheating. Then, cover the heated membrane on the carrier plate carrying the dental model, and complete thermoforming through positive pressure or negative pressure to generate an initial dental aligner attached with the dental model. The dental model base for carrying the dental model runs through the entire production process. The dental model base in the prior art has the following problems: After the membrane pressing process is completed, the membrane is covered on the dental model base carrying the dental model, and there is no effective fixation between the membrane and the dental model base, making it easy for the two to move relatively and become loose, affecting the subsequent cutting process, thus resulting in a decrease in the yield rate of invisible dental aligners. Even though, in the prior art, each invisible dental aligner factory will also set concave anti - detachment grooves on the side edges of the circumference of the dental model base, and fix the membrane and the dental model base by wrapping the membrane around the anti - detachment grooves on the side edges of the circumference of the dental model base. However, in the thermoforming equipment for invisible dental aligners, the heating source is set above the dental model. To make the membrane wrap around the anti - detachment grooves on the side edges of the circumference of the dental model base, it is necessary to increase the heating temperature or extend the heating time. For example, a heating temperature of 400°C and a heating time of 60s are required to make the membrane wrap around the circumferential edge of the dental model base. However, the area where the dental model is located is prone to cause the invisible dental aligner covering the dental model to crack due to high temperature or too long heating time, resulting in a decrease in the yield rate of invisible aligners, thus leading to the restart of invisible dental aligners and increasing costs. Summary of the Utility Model
[0004] The technical problem solved by the utility model is to overcome the defects existing in the prior art, and provide a dental model base that can facilitate the effective fixation between the membrane and the dental model base.
[0005] To achieve the above - mentioned purpose, the technical scheme adopted by the utility model is as follows:
[0006] An orthodontic model base for carrying an orthodontic model. The bearing surface of the orthodontic model base for carrying the orthodontic model is provided with a plurality of groove structures. During hot laminating, the film is pressed into the groove structures through the openings of the groove structures to prevent the film from detaching from the orthodontic model base. Among them, the groove structures are located in the space enclosed by the edge of the bearing surface and the edge of the bottom surface of the orthodontic model and are arranged at a preset distance from the edge of the bottom surface of the orthodontic model. By arranging the groove structures in the space enclosed by the edge of the bearing surface of the orthodontic model base and the edge of the bottom surface of the orthodontic model and at a preset distance from the edge of the bottom surface of the orthodontic model, during the hot laminating process, part of the film will be pressed into the groove structures, so that the film after laminating will not detach from the orthodontic model base, improving the laminating wrapping effect of the orthodontic model, and thus improving the yield rate of invisible tooth aligners.
[0007] Preferably, the groove structure includes a limiting portion. The part of the film pressed into the groove structure during hot laminating abuts against the limiting surface of the limiting portion to restrict the movement of the part of the film in the opposite direction of the depth direction of the groove structure. Through the setting of the limiting portion, when the film moves and detaches in the direction opposite to the depth direction of the groove structure, the film will abut against the limiting surface of the limiting portion in the direction opposite to the depth direction of the groove structure, restricting the detachment of the film, and thus further improving the laminating wrapping effect of the orthodontic model.
[0008] Preferably, the limiting surface is a plane or an arc surface.
[0009] Preferably, the limiting surface is formed by extending a part of the inner side wall of the groove structure from the opening end of the groove structure in a direction away from the opening end and is inclined at a preset angle with respect to the depth direction of the groove structure. Among them, the internal contour dimension of the groove structure at the end away from the opening is larger than the internal contour dimension of the opening end of the groove structure. With such a design, a limiting structure with a small opening and a large accommodating space can be formed in the groove structure. When the film moves and detaches in the direction opposite to the depth direction of the groove structure, at least part of the film will abut against the limiting surface formed by the inclined setting of a part of the inner side wall of the groove structure in the direction opposite to the depth direction of the groove structure. This structural design is simple, easy to process, and can restrict the detachment of the film, with strong practicability.
[0010] Preferably, the preset angle ranges from 5° to 60°.
[0011] Preferably, the limiting portion is a concave structure formed by the partial inner sidewall of the groove structure recessing outwardly from the groove structure, and the limiting surface is formed along the inner surface of one side of the groove structure adjacent to the opening end. By designing the limiting portion as a concave structure formed by the partial inner sidewall of the groove structure recessing outwardly from the groove structure, the area where the diaphragm is pressed in is larger, and the area where the limiting surface abuts against the diaphragm in the direction opposite to the depth direction of the groove structure is also larger, so the limiting effect is better.
[0012] Preferably, the limiting portion is a boss formed by the partial inner sidewall of the groove structure protruding inwardly from the groove structure, and the limiting surface is formed along the outer surface of one side of the groove structure away from the opening end. With such a structural design, the area where the diaphragm is pressed in is also increased, and the area where the limiting surface abuts against the diaphragm in the direction opposite to the depth direction of the groove structure is also larger, so the limiting effect is better.
[0013] Preferably, a friction layer is provided on the inner sidewall of the groove structure, and the static friction coefficient of the friction layer is greater than that of the inner sidewall of the groove structure to increase the friction force when the diaphragm disengages from the groove structure in the direction opposite to the depth direction of the groove structure. By providing a friction layer to increase the friction force when the diaphragm disengages, the disengagement of the diaphragm is restricted, and the structure is simple and convenient for processing.
[0014] Preferably, the preset distance is greater than or equal to 10 mm. With such a preset distance setting, it can be avoided that: during hot pressing of the film, the film around the dental cast is pressed into the groove structure, causing the film on the dental cast to be overly extended, resulting in the film pressed on the dental cast being too thin, which directly affects the quality of the invisible dental aligner formed by film pressing and leads to a decrease in the yield rate.
[0015] Preferably, the depth range of the groove structure along its depth direction is 1 / 4 to 3 / 4 of the thickness of the base of the dental cast. With such a structural design, the diaphragm can be pressed in to restrict the diaphragm from disengaging from the base of the dental cast, and it will not be pressed in too deep, which is not conducive to the later process of prying and removing the film.
[0016] Preferably, the groove structure extends from the edge of the base of the dental cast towards the outer edge of the dental cast. With such a structural design, when the diaphragm is pressed into the groove structure, at least one sidewall is open, which is beneficial for the diaphragm to be pressed in and also convenient for the later process of prying and removing the film. Description of the Drawings
[0017] One or more embodiments are illustrated by way of example in the accompanying drawings, which do not constitute a limitation to the embodiments. Elements with the same reference numerals are represented as similar elements, unless otherwise stated, and the figures in the drawings do not constitute a scale limitation.
[0018] Figure 1 Structural schematic diagram of the base of the dental model in an embodiment of the present utility model;
[0019] Figures 2 to 4 Structural schematic diagram of the base of the dental model in other embodiments of the present utility model;
[0020] Figure 5 Side structural schematic diagram of the base of the dental model in an embodiment of the present utility model;
[0021] Figure 6 is Figure 5 Partial enlarged view of area A in;
[0022] Figures 7 to 9 Cross-sectional schematic diagram of the groove structure in other embodiments of the present utility model;
[0023] Figures 10 to 12 Cross-sectional schematic diagram of the groove structure in other embodiments of the present utility model;
[0024] Figure 13 Cross-sectional schematic diagram of the friction layer in an embodiment of the present utility model;
[0025] Figure 14 Cross-sectional schematic diagram of the friction layer in another embodiment of the present utility model. Detailed implementation manners
[0026] To make the objectives, technical solutions and advantages of the embodiments of the present utility model clearer, the following will elaborate on each implementation manner of the present utility model with reference to the accompanying drawings. However, those of ordinary skill in the art can understand that in each implementation manner of the present utility model, many technical details are presented for the better understanding of the readers. However, even without these technical details and various changes and modifications based on the following implementation manners, the technical solutions claimed by the present utility model can still be achieved. The division of the following embodiments is for convenience of description and should not constitute any limitation to the specific implementation manner of the present utility model.
[0027] The directional terms such as "upper", "lower", "left", "right", etc. used in the description herein are all the directions in the drawings and do not refer to special limitations. Unless otherwise clearly specified and limited, the term "connection" herein should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated, and can be directly connected or indirectly connected through an intermediate medium.
[0028] In each embodiment of the present utility model, the "posterior tooth area" mentioned is defined according to the classification of teeth on pages 36 - 38 of the second edition of "Introduction to Stomatology" published by Peking University Medical Press, including premolars and molars, teeth marked as 4 - 8 in the FDI notation, and teeth marked as 1 - 3 in the FDI notation in the anterior tooth area. The teeth in the anterior tooth area include central incisors, lateral incisors, and canines.
[0029] As can be seen from the background art, the dental cast base in the prior art has the following problems: after the thermoforming process is completed, the film is covered on the dental cast base carrying the dental cast, and there is no effective fixation between the film and the dental cast base, making it easy for the two to move relatively and become loose, affecting the subsequent cutting process, and thus resulting in a decrease in the yield rate of invisible dental aligners. Even though each invisible dental aligner factory will set concave anti - detachment grooves on the side edges of the circumferential periphery of the dental cast base, and fix the film and the dental cast base by wrapping the film around the anti - detachment grooves on the circumferential side edge of the dental cast base. However, in the thermoforming equipment for invisible dental aligners, the heating source is set above the dental cast. To make the film wrap around the anti - detachment grooves on the circumferential side edge of the dental cast base, it is necessary to increase the heating temperature or extend the heating time to enable the film to wrap around the circumferential edge of the dental cast base. However, the area where the dental cast is located is prone to cause the invisible dental aligner covering the dental cast to crack due to high temperature or too long heating time, resulting in a decrease in the yield rate of invisible aligners, and thus leading to the restart of invisible dental aligners and an increase in cost.
[0030] Based on this, the applicant proposes a dental cast base that can not only solve the problem of ineffective fixation between the film and the dental cast base, but also does not require increasing the heating temperature or extending the heating time, thus not affecting the product quality of invisible aligners. The bearing surface of the dental cast base of the present utility model for carrying the dental cast is provided with a plurality of groove structures. During thermoforming, the film is pressed into the groove structures through the openings of the groove structures to limit the film from detaching from the dental cast base; wherein, the groove structures are located in the space enclosed by the edge of the bearing surface and the edge of the bottom surface of the dental cast and are arranged at a preset distance from the edge of the bottom surface of the dental cast. By arranging the groove structures in the space enclosed by the edge of the bearing surface of the dental cast base and the edge of the bottom surface of the dental cast and at a preset distance from the edge of the bottom surface of the dental cast, during the thermoforming process, a part of the film will be pressed into the groove structures, so that the film after thermoforming will not detach from the dental cast base, improving the thermoforming wrapping effect of the dental cast, and thus being able to improve the yield rate of invisible dental aligners.
[0031] Please refer to Figures 1 to 3As shown, the dental model base 100 of the present application is used to carry the dental model 200. The bearing surface S of the dental model base 100 for carrying the dental model 200 is provided with a plurality of groove structures 1. Among them, the groove structures 1 are located in the space enclosed by the edge of the bearing surface S and the bottom edge of the dental model 200 and are arranged at a preset distance L from the bottom edge of the dental model 200. During thermoforming of the film, the film 2 is pressed into the groove structures 1 through the openings of the groove structures 1 to prevent the film 2 from detaching from the dental model base 100. The preset distance refers to the distance between the groove structure 1 and the position of the bottom edge of the dental model 200 closest to it. Being arranged at a preset distance L ensures that the groove structures 1 are not provided on the part of the bearing surface S of the dental model base covered by the bottom surface of the dental model 200. Among them, when there are multiple groove structures 1 on the bearing surface S, the preset distance L refers to the smallest distance among the multiple groove structures 1 from the bottom edge of the dental model 200. It can be understood that there can also be one groove structure 1, and the present application does not limit the number of the groove structures 1. By arranging the groove structures 1 in the space enclosed by the edge of the bearing surface S of the dental model base and the bottom edge of the dental model 200 and at a preset distance L from the bottom edge of the dental model 200, during the thermoforming process of the film, a part of the film 2 will be pressed into the groove structures 1, so that the formed film 2 after thermoforming will not detach from the dental model base 100, improving the thermoforming wrapping effect of the dental model 200, and thus being able to improve the yield rate of the invisible tooth aligner.
[0032] In some embodiments, the preset distance L ≥ 10 mm. If the preset distance L between the groove structure 1 and the bottom edge of the dental model 200 is less than 10 mm, after the film 2 is thermoformed on the dental model 200, if the groove structure 1 is too close to the dental model 200, when it continues to be pressed into the groove structure 1, the invisible tooth aligner formed by thermoforming may have a thinner structure in some areas due to excessive stretching of part of the film 2, and finally may lead to the breakage of the invisible tooth aligner, or even cause the restart of the invisible tooth aligner, increasing the cost.
[0033] In some embodiments, please refer to Figure 4 As shown, the groove structure 1 is formed by concave inward from the bearing surface S of the dental model base 100 for carrying the dental model 200 in a direction away from the bearing surface S. In some other embodiments, a groove structure 1 can also be assembled on the bearing surface S, and it can also ensure that the film 2 can be pressed into the groove structure 1 during thermoforming. The present application does not limit this.
[0034] In some embodiments, please continue to refer to Figure 4As shown, the groove structure 1 extends from the edge of the dental model base 100 towards the bottom edge of the dental model 200, that is, the side of the groove structure 1 facing the edge of the dental model base 100 is an open structure. When hot-pressing the film, the film 2 is pressed into the groove structure 1 of such a structure. When the film 2 is pressed in, there is no resistance on the side of the edge of the dental model base 100, making it more convenient to press in. Moreover, through the inventor's experimental verification, when the hot-pressing temperature is 370°, and the hot-pressing time is approximately 10s to 15s, the film 2 can be pressed into the groove structure 1. While effectively fixing the film 2 and the dental model base 100, compared with the prior art of pressing the film into the anti-detachment groove provided on the circumferential side edge of the dental model base, it saves time and reduces the temperature, not only saving costs, but also in the subsequent film prying and demolding process, because at least the part of the film 2 pressed in has no limit on the side facing the edge of the dental model base 100, which is beneficial for demolding. Such a structural design can achieve a balance between the limiting effect and the ease of demolding, and has stronger practicability.
[0035] In some embodiments, the groove structure includes a limiting portion. When hot-pressing the film, at least part of the film is pressed into the groove structure, and when the film moves in the direction opposite to the depth direction of the groove structure, the film will abut against the limiting surface of the limiting portion. Among them, the limiting surface can be a plane or an arc surface. Thereby, the movement of the part of the film in the direction opposite to the depth direction of the groove structure can be restricted. Through the setting of the limiting portion, when the film moves and detaches in the direction opposite to the depth direction of the groove structure, the film will abut against the limiting surface of the limiting portion in the direction opposite to the depth direction of the groove structure, restricting the detachment of the film, thereby further improving the film wrapping effect of the dental model.
[0036] In some embodiments, please refer to Figure 5 and Figure 6 As shown, the limiting surface 12 is inclined and extends from a part of the inner wall of the groove structure 1 from the open end of the groove structure 1 towards the direction away from the open end, and the limiting surface 12 is set at a preset angle α with the depth direction X of the groove structure 1. Among them, the internal contour dimension of the groove structure 1 at the end away from the open end is larger than the internal contour dimension of the open end of the groove structure 1. With such a design, a limiting structure with a small opening and a large accommodating space can be formed in the groove structure 1. When the film 2 moves and detaches in the direction opposite to the depth direction X of the groove structure, at least part of the film 2 will abut against the limiting surface 12 in the direction opposite to the depth direction X of the groove structure, thereby restricting the detachment of the film 2. This structural design is simple, is convenient for processing, and can restrict the detachment of the film 2, and has relatively strong practicability.
[0037] In some embodiments, the angular range of the preset angle α is from 5° to 60°. In the inventor's experimental verification, it is found that when the preset angle α is less than 5°, the inner sidewall of the groove structure 1 is almost perpendicular to the bottom wall of the groove structure 1, and the formed limiting surface 12 has an insignificant limiting effect; when the preset angle α is greater than 60°, some of the diaphragm 2 pressed in is not easily demolded in the subsequent film prying and demolding process, causing time-consuming and laborious in the subsequent processes and being disadvantageous to the efficiency of the entire manufacturing process of the invisible tooth aligner.
[0038] In some embodiments, the depth h of the groove structure 1 in the depth direction X thereof is designed. If its depth value is small, the depth of the diaphragm 2 pressed in is small, and the restricting effect on the diaphragm 2 from detaching from the dental model base 100 is small; while if the depth value of the groove structure 1 is large, the depth of the diaphragm 2 pressed in is large. Although the restricting effect on the diaphragm 2 from detaching from the dental model base 100 is large, as described in the foregoing embodiments of this specification, it will cause the diaphragm 2 pressed in too deep to be not easily demolded in the subsequent film prying and demolding process, resulting in time-consuming and laborious in the subsequent processes and being disadvantageous to the efficiency of the entire manufacturing process of the invisible tooth aligner. According to the inventor's experimental data, the depth h of the groove structure 1 in the depth direction X is preferably in the range of 1 / 4 to 3 / 4 of the thickness H of the dental model base 100. With such a structural design, the diaphragm 2 can be pressed in to restrict the diaphragm 2 from detaching from the dental model base 100, and will not be pressed in too deep, that is, it can not only ensure the restricting effect on the detachment of the diaphragm 2, but also will not have an adverse effect on the subsequent processes.
[0039] In some embodiments, please refer to Figures 7 to 9 As shown, the limiting portion 11 is an inwardly concave structure formed by the partial inner sidewall of the groove structure 1 recessing towards the outside of the groove structure 1. The outside of the groove structure 1 is the side relative to the inner sidewall of the groove structure 1, referring to the side away from the accommodating space formed by the groove structure 1. Among them, the inwardly concave structure can be a rectangular structure or a semi-circular structure; the inwardly concave structure can be one, two or more. The core design is that the inwardly concave structure must form a limiting surface 12 in the opposite direction of the depth direction X of the groove structure to abut against the diaphragm 2, so as to restrict the diaphragm 2 from detaching from the dental model base 100. In this embodiment, the limiting surface 12 is formed along the inner surface of the groove structure 1 on the side adjacent to the opening end. By designing the limiting portion 11 as an inwardly concave structure formed by the partial inner sidewall of the groove structure 1 recessing towards the outside of the groove structure 1, the area of the diaphragm 2 pressed in is larger, and the area of the limiting surface 12 abutting against the diaphragm 2 in the direction opposite to the depth direction X of the groove structure is also larger, and the limiting effect is better.
[0040] In some embodiments, please refer to Figures 10 to 12 As shown, the limiting portion 11 is a boss formed by protruding a part of the inner side wall of the groove structure 1 toward the inside of the groove structure 1. Among them, the boss can be a rectangular structure or a semi-circular structure; the boss can be one, two or more. The core design is that the boss must form a limiting surface 12 in the opposite direction of the depth direction X of the groove structure to abut against the diaphragm 2, so as to limit the diaphragm 2 from detaching from the dental arch model base 100. The limiting surface 12 is formed on the outer surface of one side of the groove structure 1 away from the opening end. With such a structural design, the area where the diaphragm 2 is pressed in is also increased, and the area where the limiting surface 12 abuts against the diaphragm 2 in the direction opposite to the depth direction X of the groove structure is also relatively large, and the limiting effect is better.
[0041] In some embodiments, please refer to Figure 13 and Figure 14 As shown, a friction layer 3 is provided on the inner side wall of the groove structure 1. The friction layer 3 can be a rough surface on the inner side wall of the groove structure 1, or a layer of gel with a relatively large static friction coefficient sprayed, bonded or welded. The static friction coefficient of the friction layer 3 is greater than the static friction coefficient of the inner side wall of the groove structure 1 to increase the friction force when the diaphragm 2 detaches from the groove structure 1 in the opposite direction of the depth direction X of the groove structure. By providing the friction layer 3 to increase the friction force received when the diaphragm 2 detaches, the diaphragm 2 is restricted from detaching, and the structure is simple and convenient for processing. Specifically, as Figure 13 shown, the inner side walls of the groove structure 1 enclose a regular rectangle, that is, the dimensions of the groove structure 1 from its opening end to the end far from its opening end are the same. In this embodiment, the friction force is greater than the moving force when the diaphragm 2 detaches from the dental arch model base 100, so as to restrict the detachment of the diaphragm 2. It can also be as Figure 14 shown, the friction layer 3 can be provided on the inner side wall of the groove structure 1 having the limiting portion 11. It can be understood that it has nothing to do with the specific structure of the limiting portion 11, and the structures of the limiting portion 11 described in the specification of the present application are all acceptable. In this embodiment, when the part of the diaphragm 2 pressed into the groove structure 1 detaches from the dental arch model base 100, it will be subjected to the dual restraint of the abutment of the limiting portion 11 and the friction force of the friction layer 3 in the opposite direction of the depth direction X of the dental arch model 200, and the difficulty of detaching from the dental arch model base 100 is increased, playing a very good role in restricting the diaphragm 2 from detaching from the dental arch model base 100.
[0042] It should be noted that, without conflict, the above embodiments can be freely combined as needed to form different new implementation schemes, and the implementation schemes formed after such combination are all within the protection scope of this application. For the sake of saving the space of the application text, they will not be elaborated here.
[0043] The above are only the preferred implementation modes of this application. It should be pointed out that for those of ordinary skill in the art in this technical field, without departing from the principle of this invention creation, several improvements and refinements can be made, and these improvements and refinements should also be regarded as within the protection scope of this application.
[0044] Similarly, the above are only the specific implementation modes of this application, but the protection scope of this application is not limited thereto. Any person skilled in the art in this technical field can easily think of changes or substitutions within the technical scope disclosed in this application, and all should be covered within the protection scope of this application. Therefore, the protection scope of this application should be subject to the protection scope of the claims.
Claims
1. A dental cast base for supporting a dental cast, characterized in that, The base of the dental cast is provided with a plurality of groove structures on the bearing surface for bearing the dental cast. During hot pressing of the film, the film is pressed into the groove structures through the openings of the groove structures to prevent the film from detaching from the base of the dental cast; wherein, the groove structures are located within the space enclosed by the edge of the bearing surface and the edge of the bottom surface of the dental cast and are arranged at a preset distance from the edge of the bottom surface of the dental cast.
2. The dental arch model base according to claim 1, characterized in that, The groove structure includes a limiting portion, and the part of the film pressed into the groove structure during hot pressing of the film abuts against the limiting surface of the limiting portion to restrict the movement of the part of the film in the opposite direction of the depth direction of the groove structure.
3. The dental arch model base according to claim 2, characterized in that, The limiting surface is a plane or an arc surface.
4. The dental arch model base according to claim 2 or 3, characterized in that, The limiting surface is formed by extending a part of the inner side wall of the groove structure from the opening end of the groove structure in a direction away from the opening end and is inclined at a preset angle with respect to the depth direction of the groove structure. Among them, the internal contour size of the groove structure at the end away from the opening is larger than the internal contour size of the groove structure at the opening end.
5. The dental arch model base according to claim 4, characterized in that, The preset angle ranges from 5° to 60°.
6. The dental arch model base according to claim 2 or 3, characterized in that The limiting portion is a concave structure formed by recessing a part of the inner side wall of the groove structure towards the outside of the groove structure, and the limiting surface is formed along the inner surface of one side of the groove structure adjacent to the opening end.
7. The dental cast base according to claim 2 or 3, characterized in that, The limiting portion is a boss formed by protruding a part of the inner side wall of the groove structure towards the inside of the groove structure, and the limiting surface is formed along the outer surface of one side of the groove structure away from the opening end.
8. The dental arch model base according to claim 1, characterized in that, A friction layer is provided on the inner side wall of the groove structure, and the static friction coefficient of the friction layer is greater than the static friction coefficient of the inner side wall of the groove structure to increase the friction force when the film detaches from the groove structure in the opposite direction of the depth direction of the groove structure.
9. The dental arch model base according to claim 1, characterized in that, The preset distance is greater than or equal to 10 mm.
10. The dental arch model base according to claim 1, characterized in that, The depth range of the groove structure along its depth direction is 1 / 4 to 3 / 4 of the thickness of the base of the dental cast.
11. The dental cast base according to claim 1, characterized in that, The groove structure extends from the edge of the base of the dental cast towards the outer edge of the dental cast.