Dental jaw model manufactured based on additive manufacturing mode and shell-shaped dental instrument

Abstract

The utility model discloses a dental model manufactured on the basis of an additive manufacturing mode, which is used as a mold for manufacturing a shell-shaped dental appliance through hot-pressing film forming and comprises a dental model body made of a first material, and occlusal surfaces of rear tooth areas on two sides of the dental model body are respectively provided with repositioning jaw elements extending towards the opposite jaw direction; the repositioning jaw element comprises a base part made of a first material and a filling part made of a second material, the filling part is fixedly connected with the base part through a weak connecting part, the weak connecting part can be broken when bearing force larger than a preset value so that the filling part can be separated from the base part, the first material is different from the second material, and the filling part can be separated from the base part. And the second material is intraoral special light-cured resin. The utility model further provides a shell-shaped dental instrument manufactured by the dental model through a hot-pressing film forming process. The shell-shaped dental instrument comprises a shell-shaped dental appliance and a filling part.

Description

Technical Field

[0001] This utility model belongs to the field of dental orthodontics technology, and more specifically relates to dental instrument manufacturing technology, particularly to a dental jaw model and shell-shaped dental instrument based on additive manufacturing. Background Technology

[0002] In the field of orthodontic technology, invisible aligners based on polymer materials are becoming increasingly popular due to their aesthetic appeal, convenience, and ease of cleaning. Invisible aligners are typically a single, integrated shell that forms a cavity to accommodate multiple teeth, with the geometry of the cavity closely matching the arrangement of these teeth. Currently, the automated manufacturing process for invisible aligners commonly employs a thermoforming process. Compared to 3D printing, which directly prints invisible aligners, thermoforming offers advantages such as mature technology and lower production costs, making it the mainstream manufacturing process for invisible orthodontic manufacturers. In the thermoforming process, the required liner is first heated, then placed over a dental model, covered with a pressure-holding structure, and pressurized to complete the thermoforming process.

[0003] Currently, in the field of invisible orthodontic treatment, it is common to add occlusal pads to the posterior teeth area of ​​the invisible orthodontic appliance, or TwinBlocks to adjust intermaxillary relationships. These invisible orthodontic appliances are manufactured using a thermoforming process, which requires first 3D printing a designed dental model, then designing the corresponding accessory models at the appropriate locations on the model. A heated film is then placed on the dental model, cut, and removed. The resulting appliance has cavities containing the shapes of the aforementioned accessory models. However, the occlusal forces in the posterior teeth area are often very high. In clinical practice, when these cavities interact with the opposing jaw, they often collapse, become flattened, or crack due to the high occlusal forces, resulting in poor stability and preventing the appliance from achieving the desired therapeutic effect. Currently, some orthodontic manufacturers process the cavities of these attachment models into solid attachments, for example, by directly printing solid attachments using 3D printing technology. However, as mentioned earlier, the production cost of 3D printing technology is high and not suitable for large-scale production. Alternatively, some orthodontic manufacturers still process invisible aligners using a thermoforming process. After forming the cavities of these attachments, they fill the cavities with fillers. However, this brings new problems: First, in the existing technology, the fillers and invisible aligners are manufactured separately. It is difficult to perfectly match the outer contour size of the filler with the inner contour size of the cavity on the invisible aligner. If the filler size is small, the stability of the filler after filling the cavity is insufficient, and it is easy to fall out. If the filler size is large, installation is difficult, or the attachment cavity may deform due to the expansion of the large-sized filler after installation. Ultimately, the expected treatment effect may not be achieved. Secondly, although the mechanical strength of the cavity is enhanced by the filling material, the filling material must be made of medical-grade materials that can be ingested. On the one hand, this increases the cost of materials for orthodontic manufacturers, and on the other hand, it increases the overall weight of the orthodontic appliance during transportation, thus increasing transportation costs. Utility Model Content

[0004] The technical problem solved by this utility model is to overcome the defects of the existing technology and provide a dental model based on additive manufacturing. Based on this dental model, a shell-shaped dental instrument can be easily manufactured, which contains a filling part that matches the size of the attachment cavity and can be firmly fixed inside the attachment cavity. This shell-shaped dental instrument can meet the mechanical strength requirements of the attachment cavity on the shell-shaped orthodontic appliance and can reduce the manufacturing and transportation costs of the shell-shaped orthodontic appliance.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0006] A dental model manufactured using additive manufacturing, used as a mold for thermoforming shell-shaped orthodontic appliances, includes a dental model body made of a first material. The occlusal surfaces of the two posterior tooth regions of the dental model body are respectively provided with repositioning occlusal elements extending towards the opposing jaw. Each repositioning occlusal element includes a base portion made of the first material and a filling portion made of a second material. The filling portion is fixedly connected to the base portion via a weak connection portion, which is capable of breaking when subjected to a force greater than a predetermined value, allowing the filling portion to detach from the base portion. The first material and the second material are different; the second material is an intraoral light-cured resin.

[0007] Preferably, the weak connection portion includes a plurality of spaced sub-connection portions, the height of the sub-connection portions being 1mm-3mm, and the distance between adjacent sub-connection portions being 2mm-4mm.

[0008] Preferably, the sub-connecting portion is a breakable columnar structure that weakly connects the filling portion to the base portion. The columnar structure has a uniform characteristic diameter from one end adjacent to the filling portion to one end near the base portion, wherein the characteristic diameter is 0.3mm-0.8mm.

[0009] Preferably, the sub-connecting portion includes a first connecting portion connected to the base portion, a second connecting portion connected to the filling portion, and a first breakable portion connecting the first connecting portion and the second connecting portion. The diameter of the first connecting portion gradually decreases from one end near the base portion to one end near the first breakable portion, and the diameter of the second connecting portion gradually decreases from one end near the filling portion to one end near the first breakable portion. The characteristic diameter of the first breakable portion is 0.3mm-0.8mm.

[0010] Preferably, the sub-connecting portion includes a second breakable portion connected to the filling portion, and a third connecting portion connecting the second breakable portion and the base portion. The diameter of the third connecting portion gradually decreases from one end near the base portion to one end near the second breakable portion, wherein the characteristic diameter of the second breakable portion is 0.3mm-0.8mm.

[0011] Preferably, the weak connection portion is formed of the second material.

[0012] Preferably, the filling portion includes an engagement surface and several side surfaces, wherein several side surfaces are provided with retaining portions, the retaining portions being recesses that are recessed inward from the side surfaces or protrusions that are protruding outward from the side surfaces.

[0013] Preferably, the occlusal surface has a structure that matches the concavity and convexity of the occlusal surface at the corresponding position of the opposing jaw.

[0014] Preferably, the height dimension of the filling portion in the gingival direction is 1 / 3 to 1 times the height dimension of the base portion in the gingival direction.

[0015] Preferably, the cheek side of the base portion is provided with a plurality of first reinforcing portions formed by the cheek side of the base portion being recessed inward or protruding outward, and / or, the tongue side of the base portion is provided with a plurality of second reinforcing portions formed by the tongue side of the base portion being recessed inward or protruding outward.

[0016] To achieve the purpose of this utility model, this utility model also provides a shell-shaped dental instrument, formed from the dental model described in any of the above claims by a thermoforming process, comprising a shell-shaped orthodontic appliance and a filling portion; wherein, the occlusal surfaces of the posterior teeth on both sides of the shell-shaped orthodontic appliance each have a receiving cavity that encloses the repositioning occlusal element; when the shell-shaped orthodontic appliance is removed from the dental model, the filling portion separates from the weak connection portion and remains fixed in the receiving cavity to form the shell-shaped dental instrument, and the top surface of the filling portion is fitted to the inner surface of the occlusal surface of the receiving cavity facing the opposing occlusion.

[0017] Compared with the prior art, the present invention, by adopting the above technical solution, has at least one of the following beneficial effects:

[0018] (1) In the dental model provided by this utility model, the repositioning jaw element in the posterior tooth region on both sides of the dental model body includes a base part made of a first material and a filling part made of a second material. The two are fixedly connected by a weak connection part. On the one hand, on the shell-shaped dental instrument after hot pressing, the outer contour shape and size of the filling part are consistent with the inner contour shape and size of the receiving cavity with the shape of the repositioning jaw element. After demolding, it remains in the receiving cavity. Moreover, the filling part and the receiving cavity fit tightly and are reliably matched, which helps to enhance the deformation resistance of the receiving cavity. On the other hand, the weak connection part can break when subjected to a force greater than a predetermined value, so that the filling part can be easily separated from the base part. This design ensures that the model is stable and reliable. The design ensures structural stability during model fabrication and facilitates separation of the shell-shaped dental instrument after molding. Furthermore, the weak connection design allows the shell-shaped dental instrument to be easily and safely separated from the dental model after molding, while maintaining its structural integrity and preventing damage due to improper separation. Finally, only the separated filling portion detaches from the dental model along with the molded shell-shaped dental instrument and is housed within a cavity shaped like a repositioning jaw element. For filling portions requiring an inlet, the second material must be intraoral model resin. For the base portion, to reduce costs, it can be fabricated using ordinary 3D printed photosensitive resin in separate parts, meeting the medical standards for the filling portion's inlet while reducing the overall printing cost of the dental model.

[0019] (2) By setting a retaining part on the filling part, the present invention can form a matching concave-convex matching structure at the corresponding position of the shell-shaped dental instrument after hot pressing film molding. This concave-convex matching further ensures that the filling part is more stably housed in the shell-shaped dental instrument during the molding process and the wearing process, thereby improving the deformation resistance of the housing cavity of the molded shell-shaped dental instrument during biting. Attached Figure Description

[0020] One or more embodiments are illustrated by way of example with reference to the accompanying drawings. These illustrations do not constitute a limitation on the embodiments. Elements with the same numerical reference numerals are denoted as similar elements. Unless otherwise stated, the figures in the drawings do not constitute a limitation on scale.

[0021] Figure 1 This is a schematic diagram of the dental model in Embodiment 1 of this application;

[0022] Figure 2 This is a schematic diagram of the assembly of the repositioning jaw element in Embodiment 1 of this application;

[0023] Figure 3 This is a schematic diagram of the sub-connector in Embodiment 1 of this application;

[0024] Figure 4 This is a schematic diagram of another sub-connecting part in Embodiment 1 of this application;

[0025] Figure 5 This is a schematic diagram of the structure of another sub-connector in Embodiment 1 of this application;

[0026] Figure 6 This is a schematic diagram of the repositioning jaw element with a retention portion in Embodiment 1 of this application;

[0027] Figure 7 This is a schematic diagram of the repositioning jaw element having another retention part and a first reinforcing part in Embodiment 1 of this application;

[0028] Figure 8 This is a schematic diagram of the repositioning jaw element having a first reinforcing part and a second reinforcing part in Embodiment 1 of this application;

[0029] Figure 9 This is a schematic diagram of the shell-shaped dental instrument in Embodiment 2 of this application. Detailed Implementation

[0030] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the various embodiments of this utility model will be described in detail below with reference to the accompanying drawings. However, those skilled in the art will understand that many technical details have been provided in the various embodiments of this utility model to facilitate a better understanding of the invention. However, the technical solutions claimed by this utility model can be implemented even without these technical details and with various variations and modifications based on the following embodiments. The division of the various embodiments below is for ease of description and should not constitute any limitation on the specific implementation of this utility model.

[0031] The directional terms "up," "down," "left," and "right" used in this document refer to the directions shown in the accompanying drawings and do not imply any specific limitation. Unless otherwise explicitly stated or limited, the term "connection" in this document should be interpreted broadly. For example, it can refer to a fixed connection, a detachable connection, or an integral part of a structure. It can refer to a direct connection or an indirect connection through an intermediate medium.

[0032] The term "posterior tooth region" mentioned in the various embodiments of this utility model is defined according to the classification of teeth in the 2nd edition of "Introduction to Stomatology" published by Peking University Medical Press, pages 36-38. It includes premolars and molars, teeth marked as 4-8 using the FDI notation, and teeth marked as 1-3 using the FDI notation for the anterior tooth region. The teeth in the anterior tooth region include the central incisors, lateral incisors, and canines.

[0033] As the background technology indicates, in the field of invisible orthodontic treatment, it is currently necessary to add occlusal pads to the posterior teeth area of ​​the invisible orthodontic appliance to open the bite, or TwinBlocks to adjust the intermaxillary relationship. In clinical practice, due to cost considerations, orthodontic manufacturers usually choose the thermoforming process to manufacture invisible orthodontic appliances. Then, the cavity of the molded invisible orthodontic appliance, shaped like a repositioning element, is filled with filler to enhance its resistance to deformation. However, this leads to new problems such as insecure installation, easy falling off, or installation difficulties due to the mismatch between the filler and the cavity size. It also increases the cost of production materials and transportation. Therefore, there is an urgent need for a jaw model that can be fabricated using additive manufacturing. Based on this jaw model, shell-shaped dental instruments with filler-enclosed accessory cavities can be easily manufactured, meeting the mechanical strength requirements of the appliance accessory cavity and reducing the manufacturing and transportation costs of the orthodontic appliance.

[0034] Based on this, the applicant proposes a dental model that can be manufactured using additive manufacturing. The dental model is used as a mold for thermoforming shell-shaped orthodontic appliances. It includes a dental model body made of a first material. The occlusal surfaces of the two posterior tooth regions of the dental model body are respectively provided with repositioning occlusal elements extending in the opposing direction. The repositioning occlusal element includes a base part made of the first material and a filling part made of a second material. The filling part is fixedly connected to the base part through a weak connection part. The weak connection part can break when subjected to a force greater than a predetermined value, so that the filling part can detach from the base part. The first material and the second material are different. The second material is an intraoral light-cured resin. Through this structural design, on the one hand, the weak connection part can break when subjected to a force greater than a predetermined value, allowing the filling part to easily detach from the base part. This design ensures structural stability during model making and facilitates separation after the orthodontic appliance is formed. On the other hand, the design of the weak connection part allows the orthodontic appliance to be easily and safely separated from the dental model after forming, while ensuring the structural integrity of the orthodontic appliance and avoiding damage caused by improper separation. Furthermore, only the separated filling part detaches from the dental model along with the formed orthodontic appliance and is housed in a receiving cavity with the shape of a repositioning jaw element. For the filling part requiring an inlet, the second material must be intraoral model resin. For the base part, to reduce costs, ordinary 3D printing photosensitive resin can be used for printing, which meets the medical standards for the inlet of the filling part and reduces the overall printing cost of the dental model.

[0035] The following will provide a detailed explanation in conjunction with the illustrations.

[0036] Example 1

[0037] Please refer to Figure 1 And please combine Figure 9 As shown. The dental model 100 provided by this utility model is used as a mold for hot-press molding to produce a shell-shaped orthodontic appliance 60. It includes a dental model body 10 made of a first material. The occlusal surfaces of the two posterior tooth areas of the dental model body 10 are respectively provided with repositioning occlusal elements 20 extending in the opposing direction. The repositioning occlusal element 20 includes a base portion 21 made of the first material and a filling portion 22 made of a second material. The filling portion 22 is fixedly connected to the base portion 21 through a weak connection portion 30. The weak connection portion 30 can break when subjected to a force greater than a predetermined value, so that the filling portion 22 can be detached from the base portion 21. The first material and the second material are different. The second material is an intraoral light-cured resin.

[0038] To further explain, the dental model 100 serves as a mold for fabricating the shell-shaped orthodontic appliance 60 in the hot-pressing process. The dental diaphragm is hot-pressed onto the shell-shaped orthodontic appliance 60, which has a receiving cavity 70 that encloses the repositioning jaw element 20. In this application, the filling part 22 and the base part 21 are weakly connected by a weak connecting part 30. During demolding, the filling part 22 is retained in the receiving cavity 70 and finally worn in the patient's mouth to enhance the mechanical strength of the receiving cavity 70. For example, the accommodating cavity 70 can be a single-plate hollow occlusal pad structure disposed on the occlusal surface of the posterior teeth of the shell-shaped orthodontic appliance 60. When worn, it can open the bite while simultaneously leveling the SPEE curve and treating mild cases of mandibular retrusion. Alternatively, the accommodating cavity 70 can be a hollow TwinBlock structure disposed on the occlusal surface of the posterior teeth of the shell-shaped orthodontic appliance 60, guiding mandibular protrusion through the mesiodistal slopes of the protruding occlusal pads of the upper and lower jaws. Therefore, the second material must be an intraoral light-cured resin. For example, model resins of type SP_RB0808 or SP_RB0803 produced by Zhejiang Xunshi Technology Co., Ltd. can be used. These resins meet the standards for medical use and are safe for ingestion, but their cost is higher than that of ordinary 3D printing photosensitive resins. In this invention, the material used to make the filling part 22 needs to meet the medical inlet standards, thus imposing high restrictions on the second material. The base part 21 will be separated from the dental model body 10. To reduce resin costs, the first material used to make the base part 21 can be the same as the material used to make the dental model body 10, and ordinary 3D printing photosensitive resin can be selected.

[0039] The design of the weak connection portion 30 employs a relatively weak connection, ensuring a stable connection between the filling portion 22 and the base portion 21 without breakage during the molding process. When the shell-shaped orthodontic appliance 60 is demolded after molding, the weak connection portion 30 should break if a force exceeding a predetermined value is applied. Preferably, please refer to... Figure 2 As shown, the weak connection portion 30 includes a plurality of spaced-apart sub-connecting portions 31, wherein the height H of the sub-connecting portion 31 is 1mm-3mm, and the distance L between adjacent sub-connecting portions 31 is 2mm-4mm. This design helps to control the uniformity of fracture and facilitates operation. Specifically, in one embodiment, the sub-connecting portion 31 is a breakable columnar structure that weakly connects the filling portion 22 to the base portion 21. The characteristic diameter D of the columnar structure is uniform from one end adjacent to the filling portion 22 to one end adjacent to the base portion 21, wherein the characteristic diameter D is 0.3mm-0.8mm. Please refer to... Figure 3As shown, the columnar structure can be cylindrical, but it can also be a polygonal prism, such as a triangular prism, a square prism, a hexagonal prism, or any other polyhedron of any shape. In a preferred embodiment, the characteristic diameter D of the columnar structure serving as a connecting structure is uniform from one end near the filling part 22 to one end near the base part 21. It can correspond to the relative midpoint between the filling part 22 and the base part 21, or be evenly distributed on the entire surface where the filling part 22 and the base part 21 connect. However, it is not limited to this, as long as it can stably connect the filling part 22 and the base part 21 after printing and will not break during the molding process, and when the shell-shaped dental appliance 60 formed after molding is demolded, the columnar structure can break when a force greater than a predetermined value is applied to it. In this embodiment, the characteristic diameter D of the columnar structure is designed to be 0.3mm-0.8mm. The inventors have verified through testing that this characteristic diameter D range is sufficient to stably connect the filling part 22 and the base part 21 without breaking during molding. However, when the shell-shaped orthodontic appliance 60 formed after molding is demolded, the columnar structure can break when a force greater than a predetermined value is applied to it. Furthermore, in addition to the characteristic diameter D, the strength of the columnar structure can also be controlled by modifying its shape, length, or height. Optionally, the columnar structure can also be a hollow pillar, as long as it can stably connect the filling part 22 and the base part 21 after printing and will not break during molding, and when the shell-shaped orthodontic appliance 60 formed after molding is demolded, the columnar structure can break when a force greater than a predetermined value is applied to it.

[0040] In this embodiment, the columnar structure can be made of the second material. In this way, regardless of whether a small amount of residue remains on the bottom surface of the filling part 22 after the columnar structure breaks, the inlet requirements can be met without additional grinding, thus saving process and time.

[0041] In another embodiment, please refer to Figure 4As shown, the sub-connecting portion 31 includes a first connecting portion 32 connected to the base portion 21, a second connecting portion 33 connected to the filling portion 22, and a first fractured portion 34 connecting the first connecting portion 32 and the second connecting portion 33. The diameter of the first connecting portion 32 gradually decreases from one end near the base portion 21 to one end near the first fractured portion 34, and the diameter of the second connecting portion 33 gradually decreases from one end near the filling portion 22 to one end near the first fractured portion 34. The characteristic diameter D of the first fractured portion 34 is 0.3mm-0.8mm. In this embodiment, the fracture of the weak connecting portion 30 occurs when a force greater than a predetermined value is applied, causing several sub-connecting portions 31 to fracture at the location of the first fractured portion 34, thereby detaching the filling portion 22 from the base portion 21 and the dental model body 10. Therefore, it is necessary to limit the characteristic diameter D of the first fractured portion 34 to be between 0.3mm and 0.8mm. In this embodiment, after the second connecting portion 33 breaks, it separates from the base portion 21 and the dental model body 10 along with the filling portion 22 and is housed inside the receiving cavity 70. The material used to manufacture this portion must be the second material. Preferably, the material used to manufacture the first breakable portion 34 can also be the second material. Thus, regardless of whether a small amount of the first breakable portion 34 remains in the second connecting portion 33 after breaking, the entry requirements are met, eliminating the need for additional polishing and saving steps and time. In another embodiment, please refer to... Figure 5 As shown, the sub-connecting portion 31 may further include a second fractureable portion 35 connected to the filling portion 22, and a third connecting portion 36 connecting the second fractureable portion 35 and the base portion 21. The diameter of the third connecting portion 36 gradually decreases from one end near the base portion 21 to one end near the second fractureable portion 35. The characteristic diameter D of the second fractureable portion 35 is 0.3mm-0.8mm. In this embodiment, the fracture of the weak connecting portion 30 occurs when a force greater than a predetermined value is applied, causing several sub-connecting portions 31 to fracture at the second fractureable portion 35, thereby detaching the filling portion 22 from the base portion 21 and the dental model body 10. Therefore, it is necessary to limit the characteristic diameter D of the second fractureable portion 35 to be between 0.3mm and 0.8mm. This structural design clearly defines the breakable location (the location of the second breakable part 35), and after breaking at this point, less residue remains on the bottom surface of the filling part 22, making polishing easier; alternatively, the second material can be used to make the second breakable part 35. This design ensures that regardless of whether a small amount of residue remains on the bottom surface of the filling part 22 after breaking, the inlet requirements are met, eliminating the need for additional polishing and saving processes and time; furthermore, compared to... Figure 3 and Figure 4 In the embodiment shown, the second material of the weak connection portion 30 in this embodiment is used in the least amount of material, which is beneficial to reducing production costs.

[0042] Further explanation: the filling portion 22 includes an engagement surface S and several side surfaces. In one embodiment, retaining portions 40 are provided on several side surfaces. The retaining portions 40 are recesses that are inwardly recessed from the side surfaces or protrusions that are outwardly protruding. In one embodiment, please refer to... Figure 6 As shown in the illustration, this embodiment illustrates that a retaining portion 40 is recessed on the cheek side of the filling portion 22. The retaining portion 40 is formed by a portion of the cheek side of the filling portion 22 being recessed inward, and its cross-sectional shape can be circular or elliptical; of course, it is understood that the cross-sectional shape can also be other regular or irregular polygons such as trapezoids, triangles, squares, etc.; it can also be as follows: Figure 7 As shown, the retention portion 40 is a ridge formed by a portion of the buccal side of the filling portion 22 protruding outward. The ridge can extend from one end of the filling portion 22 near the base portion 21 to the end away from the base portion 21. Alternatively, the retention portion 40 may be provided concavely or convexly on both the buccal and lingual sides of the filling portion 22, or only on the lingual side of the filling portion 22. During hot pressing, a portion of the dental film will protrude or recede at this location, which helps to enhance the retention force between the filling portion 22 and the hot-pressed shell-shaped orthodontic appliance 60 during the demolding process, preventing it from falling off. It also ensures that after demolding, the filling portion 22 can be accommodated and fixed in the corresponding receiving cavity 70 of the shell-shaped orthodontic appliance 60.

[0043] More preferably, in the design, from the perspective of effective retention and easy demolding, the depth dimension of the concave or convex part 40 (i.e., the buccal or lingual concave or convex dimension) can be designed to be 0.4mm-0.8mm. The inventors verified through experiments that when the depth dimension of the concave or convex part 40 is less than 0.4mm, the retention force is not strong; when it is greater than 0.8mm, the protruding or concave part of the dental film is not easy to detach from the dental model 100 during the demolding process, resulting in demolding difficulties.

[0044] To further explain, the occlusal surface S of the filling portion has a structure that matches the concavity and convexity of the occlusal surface at the corresponding position of the opposing jaw. Please refer again. Figure 2As shown, the occlusal surface S of the filling portion has a structure that matches the concavity and convexity of the occlusal surface of the opposing dentition at the corresponding position. Specifically, in the shell-shaped dental instrument 200 formed by hot pressing, the shape of the occlusal surface of its accommodating cavity 70 is consistent with the shape of the occlusal surface S of the filling portion. That is, if the opposing dentition is wearing a shell-shaped dental instrument, the outer surface of the occlusal surface S can be designed to match the concavity and convexity of the occlusal surface of the shell-shaped dental instrument at the corresponding position of the opposing dentition; if the opposing dentition is not wearing a shell-shaped dental instrument, the outer surface of the occlusal surface S can be designed to match the concavity and convexity of the occlusal surface of the posterior teeth at the corresponding position of the opposing dentition. This design allows the occlusal surface of the accommodating cavity 70 of the shell-shaped dental instrument 200 formed by hot pressing of the dental model 100 to match the concavity and convexity of the opposing occlusal surface at the corresponding position of the opposing dentition, which not only improves the occlusal effect during upper and lower jaw occlusion but also increases the comfort and stability of the shell-shaped dental instrument 200 after wearing.

[0045] To further explain, in this application, the height of the filling portion 22 in the gingival-maxillary direction is 1 / 3 to 1 times the height of the base portion 21 in the gingival-maxillary direction. As explained above, the filling portion 22, which fills the interior of the accommodating cavity 70, is made from a material that is more expensive than ordinary 3D-printed photosensitive resin. Therefore, while ensuring the overall deformation resistance of the accommodating cavity 70, a smaller volume of the filling portion 22 can save production costs. Thus, through the inventors' experiments, when the height of the filling portion 22 in the gingival-maxillary direction is designed to be 1 / 3 to 1 times the height of the base portion in the gingival-maxillary direction, the filling portion 22 can both meet the overall deformation resistance requirements of the accommodating cavity 70 and control the production cost of the filling portion 22. Furthermore, this proportional design ensures the strength of the accommodating cavity 70 while avoiding discomfort to the patient caused by an excessively high accommodating cavity 70.

[0046] To further explain, in order to ensure that the shell-shaped orthodontic appliance 60, after being thermoformed by the dental model 100, has a deformation-resistant accommodating cavity 70 in the posterior tooth region with the shape of the repositioning occlusal element 20, this application also provides a plurality of first reinforcing portions 51 on the buccal side of the base portion 21, which are recessed inward or protruded outward from the buccal side of the base portion 21, and / or, a plurality of second reinforcing portions 52 on the lingual side of the base portion 21, which are recessed inward or protruded outward from the lingual side of the base portion 21. This structural design enhances the overall deformation resistance of the receiving cavity 70 on the molded shell-shaped orthodontic appliance 60. Specifically, a ridge or groove corresponding to the first reinforcing part 51 and / or the second reinforcing part 52 is formed by hot pressing on the receiving cavity 70 at the position corresponding to the base part 21. The ridge or groove enhances the deformation resistance of the receiving cavity 70 at the position corresponding to the base part 21. Combined with the filling part 22 of this application, the overall deformation resistance of the receiving cavity 70 is further improved. For details, please refer to... Figure 7 As shown, the first reinforcing part 51 is a ridge that protrudes outward from the buccal side of the base part 21, and all the ridges extend along the gingival-maxillary direction; in this embodiment, three ridges are provided on the buccal side of the base part 21. It can be understood that the number of ridges can be one or other, as long as it is sufficient to ensure that the molded receiving cavity 70 has the required resistance to deformation. For example, Figure 8 As shown, the first reinforcing part 51 is a groove recessed inward from a portion of the buccal side of the base part 21, and the second reinforcing part 52 is a groove formed by a portion of the lingual side of the base part 21, and both grooves extend along the gingival-maxillary direction.

[0047] More preferably, the first reinforcing part 51 and the second reinforcing part 52 extend from one end of the base part 21 near the filling part 22 to one end of the base part 21 near the tooth model body 10 along the gingival direction. Since the middle position of the molded accommodating cavity 70 is usually subjected to greater force during maxillary and mandibular occlusion and is prone to collapse or other forms of deformation, the ridge or groove in the mesiodistal direction of the base part 21 needs to be located at least in the middle position of the base part 21. This ensures that the molded groove or ridge is located in the middle portion of the accommodating cavity 70. More preferably, please refer to... Figure 8 As shown, in these three grooves, the spacing between two adjacent grooves in the proximal-distal direction is equal; the cheek side and tongue side of the base part 21 are provided with three grooves at the same time. With this design, the deformation resistance of the cheek side and tongue side of the molded receiving cavity 70 can be improved at the same time, which is beneficial to the overall deformation resistance of the receiving cavity 70.

[0048] Example 2

[0049] To achieve the purpose of this application, this application also provides a shell-shaped dental instrument 200, please refer to... Figure 9 As shown, the dental model 100 described in any of the embodiments in Example 1 is formed by a hot-press molding process, including a shell-shaped dental appliance 60 and a filling portion 22; wherein, the occlusal surfaces of the posterior teeth on both sides of the shell-shaped dental appliance 60 each have a receiving cavity 70 that encloses the repositioning occlusal element 20; when the shell-shaped dental appliance 60 is removed from the dental model 100, the filling portion 22 separates from the weak connection portion 30 and remains fixed in the receiving cavity 70 to form the shell-shaped dental instrument 200, and the top surface of the filling portion 22 is in contact with the inner surface of the occlusal surface of the receiving cavity 70 facing the opposing jaw. Specifically, a dental film used to prepare the shell-shaped orthodontic appliance 60 is pressed onto a dental model 100 using a hot-press molding process, forming a shell-shaped orthodontic appliance 60 to be cut, which includes teeth and a repositioning jaw element 20. That is, the shell-shaped orthodontic appliance 60 to be cut has a cavity 70 that encloses the repositioning jaw element 20. Then, the excess dental film and the shell-shaped orthodontic appliance 60 are cut off using cutting techniques, for example, manually or using automated cutting equipment (such as laser cutting or mechanical cutting). Finally, the shell-shaped dental appliance 60 is removed from the dental model 100. At this time, a force greater than a predetermined value is applied, causing the weak connection 30 to break. The dental model body 10 and the base 21 are separated from the shell-shaped dental appliance 60. The filling part 22 is left and fixed in the accommodating cavity 70 to form the shell-shaped dental instrument 200. The weak connection 30 remaining on the bottom surface of the filling part 22 can be removed by grinding. Alternatively, the weak connection 30 can be made of a second material (such as intraoral light-cured resin) during manufacturing, so that it can be directly inserted into the mouth with the filling part 22 without the need for additional grinding removal.

[0050] Thus, the inner surface of the occlusal surface of the formed accommodating cavity 70 facing the opposing jaw and the top surface of the filling part 22 fit together. During biting, the filling part 22 can improve the resistance to deformation of the accommodating cavity 70 in the gingival-occlusal direction (i.e., the occlusal direction of the upper and lower jaws).

[0051] Preferably, the filling part 22 can be installed and fixed by means of adhesive bonding, laser welding, or by setting mutually cooperating installation structures between the side of the filling part 22 and the inner wall of the receiving cavity 70, so as to ensure a stable connection between the filling part 22 and the receiving cavity 70, thereby ensuring the resistance of the receiving cavity 70 to deformation in the gingival direction (i.e., the occlusal direction of the upper and lower jaws), so that it is not easily squeezed, deformed or torn during biting, thus ensuring the achievement of the expected treatment effect.

[0052] It should be noted that the above embodiments can be freely combined as needed to form different new implementation schemes without causing contradictions. All implementation schemes formed by such combinations are within the protection scope of this application. In order to save space in the application text, they will not be described in detail here.

[0053] The above description is only a preferred embodiment of this application. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the inventive principle of this application, and these improvements and modifications should also be considered within the scope of protection of this application.

[0054] Similarly, the above descriptions are merely specific embodiments of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A dental model made by an additive manufacturing method, used as a mold for thermoforming a shell-shaped dental appliance, comprising a dental model body made of a first material, characterized in that, the occlusal surfaces of the posterior teeth regions on both sides of the dental model body are respectively provided with a repositioning jaw element extending towards the opposite jaw; the repositioning jaw element comprises a base part made of the first material and a filling part made of a second material, the filling part is fixedly connected with the base part through a weak connecting part, the weak connecting part can be broken when subjected to a force greater than a predetermined value, so that the filling part can be separated from the base part, wherein the first material and the second material are not the same, and the second material is a special light-cured resin for the mouth.

2. The dental model according to claim 1, characterized in that The weak connecting part comprises a plurality of spaced sub-connecting parts, the height of the sub-connecting part is 1-3 mm, and the distance between adjacent sub-connecting parts is 2-4 mm.

3. The dental model according to claim 2, characterized in that The sub-connecting part is a breakable columnar structure for weakly connecting the filling part to the base part, and the characteristic diameter of the columnar structure is uniform from one end adjacent to the filling part to one end adjacent to the base part, wherein the characteristic diameter is 0.3-0.8 mm.

4. The dental model according to claim 2, characterized in that The sub-connecting part comprises a first connecting part connected with the base part, a second connecting part connected with the filling part, and a first breakable part connecting the first connecting part and the second connecting part, the diameter of the first connecting part gradually decreases from one end adjacent to the base part to one end adjacent to the first breakable part, and the diameter of the second connecting part gradually decreases from one end adjacent to the filling part to one end adjacent to the first breakable part, wherein the characteristic diameter of the first breakable part is 0.3-0.8 mm.

5. The dental model according to claim 2, characterized in that The sub-connecting part comprises a second breakable part connected with the filling part, and a third connecting part connecting the second breakable part and the base part, the diameter of the third connecting part gradually decreases from one end adjacent to the base part to one end adjacent to the second breakable part, wherein the characteristic diameter of the second breakable part is 0.3-0.8 mm.

6. The dental model according to claim 1, characterized in that The weak connecting part is made of the second material.

7. The dental model according to claim 1, characterized in that The filling part comprises an occlusal surface and several side surfaces, wherein several side surfaces are provided with retention parts, which are recesses recessed inwardly or protrusions protruding outwardly from the side surfaces.

8. The dental model according to claim 7, characterized in that The occlusal surface is provided with a structure matching the concave-convex structure of the opposite occlusal surface at the corresponding position of the opposite jaw.

9. The dental model according to claim 1, characterized in that The height of the filling part in the gingival direction is 1 / 3-1 times the height of the base part in the gingival direction.

10. The dental model according to claim 1, characterized in that The buccal side of the base part is provided with a plurality of first reinforcing parts recessed inwardly or protruding outwardly from the buccal side of the base part, and / or the lingual side of the base part is provided with a plurality of second reinforcing parts recessed inwardly or protruding outwardly from the lingual side of the base part.

11. A shell-shaped dental instrument, characterized in that The shell-shaped dental appliance is formed by a hot-pressing film forming process of the dental arch model according to any one of claims 1 to 10, comprising a shell-shaped dental appliance and a filling part; wherein the occlusal surfaces of the posterior teeth regions on both sides of the shell-shaped dental appliance are respectively provided with a receiving cavity wrapping the repositioning jaw element; when the shell-shaped dental appliance is removed from the dental arch model, the filling part is separated from the weak connection part and fixed in the receiving cavity to form the shell-shaped dental appliance, and the top surface of the filling part is attached to the inner surface of the occlusal surface of the receiving cavity facing the opposite jaw.

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