Dental product formed by 3D printing and method for manufacturing dental product

Abstract

The present application relates to a dental product formed by 3D printing, comprising: a first body, comprising a portion made of a first material; and a second body, connected to the first body and comprising a portion made of a second material, wherein the first material and the second material have different colors or transparencies. The dental product provided in the present application meets at least one application requirement.

Description

3D printed dental products and methods for manufacturing dental products

[0001] Related applications

[0002] This application claims priority to Chinese patent applications filed on March 25, 2025, with application number CN202520544186.0, July 7, 2025, with application number CN202510933448.7, and August 27, 2025, the entire contents of which are incorporated herein by reference. Technical Field

[0003] This application relates to a dental product, specifically, to a dental product formed by 3D printing and a method for manufacturing the dental product. Background Technology

[0004] With the development of dentistry, dental products used in implant restorations, fixed restorations, and orthodontic restorations have seen a variety of applications and processing techniques. For example, there is the need for aesthetically pleasing post-treatment coloring.

[0005] Dental products include, for example, complete dentures, crowns and bridges, orthodontic appliances, and dental molds. Various manufacturing processes exist for these products, with 3D printing being a currently popular method.

[0006] 3D photopolymerization printing is currently the main method for manufacturing dental products, and the precision of 3D photopolymerization printing meets the market's demand for precision in dental products.

[0007] Patent document CN116635214A applies for the use of multiple materials to additively manufacture target teeth. The only difference between the materials is the color and texture. Teeth obtained by using multiple colored materials are similar in color to real human teeth.

[0008] Patent document CN118201759A applies for the use of multiple materials to additively manufacture target teeth, the external color of which is close to the original teeth to be replaced, while the internal parts of the target teeth can be made of different resins.

[0009] In terms of aesthetics, existing technologies cannot meet the need to use materials of different colors or properties to construct different parts to obtain dental products.

[0010] Therefore, dental products are needed to meet at least one user need.

[0011] Application content

[0012] This application provides a dental product formed by 3D printing and a method for manufacturing dental products, which can meet diverse needs.

[0013] The first aspect of this application provides a 3D-printed dental product comprising: a first body including a portion made of a first material; and a second body connected to the first body and including a portion made of a second material, wherein the first material and the second material have different colors or transparency.

[0014] In some embodiments, the second body includes a portion made of a third material, which and the third material have different toughness, hardness, or strength. These properties are advantageous, for example, in preventing breakage.

[0015] In some embodiments, the first body of the dental product is a baseplate, and the second body is a crown.

[0016] In some embodiments, the crown includes a portion made of a third material that is more resilient than the second material.

[0017] In some embodiments, the portion made of a third material is: the part of the crown that connects to the base; or the end of the crown away from the base. A resilient end of the crown helps to prevent crown damage.

[0018] In some embodiments, the base includes a portion made of a third material, the third material being more resilient than the second material.

[0019] In some embodiments, the dental product is a tooth.

[0020] In some embodiments, the contact interface between the first body and the second body is substantially horizontal.

[0021] In some embodiments, the first body is designed to shield or surround the second body on at least one side.

[0022] In some embodiments, along the direction from the first body to the second body, the cross-sectional area of ​​the first body gradually decreases, and the cross-sectional area of ​​the second body gradually increases.

[0023] In some embodiments, the dental product is an invisible denture, the first body being a clasp; or the dental product is a denture, the first body being the gum, the second body being a tooth, and the end of the second body away from the gum being transparent or translucent, the rest of the second body being white; or the dental product is an orthodontic transfer tray, the first body being less rigid than the second body.

[0024] In some embodiments, the dental product is a crown bridge, the first body comprising: a first crown mounted on an abutment tooth and a prosthetic crown indirectly connected to the first crown; the second body is configured to connect the first crown and the prosthetic crown, wherein the toughness of the second body is greater than that of the first body.

[0025] In some embodiments, the dental product is a jaw pad, with a first body being the wearing side of the jaw pad and a second body being the occlusal side of the jaw pad.

[0026] In some embodiments, the dental product is a denture, the first body being the base and the second body being the teeth, and the denture includes partial dentures or complete dentures.

[0027] In some embodiments, the color of the end of the baseplate closer to the teeth is lighter than the color of the end of the baseplate further away from the teeth.

[0028] In some embodiments, the end of the tooth furthest from the gum line is transparent or translucent.

[0029] In some embodiments, the base includes a portion made of a third material, including a blood-like material.

[0030] In some embodiments, the dental product is a molar pad, with a first body covering a second body, and the first material being harder than the second material; or the first material being a hard material and the second material being a soft material.

[0031] In some embodiments, the dental product is applied to a partial denture, the partial denture including a framework, a dental prosthesis, and a prosthetic portion associated with the dental prosthesis, the framework being configured to be installed onto an abutment tooth; the dental product includes a base, the base including a first portion and a second portion, wherein the framework is sandwiched between the first portion and the second portion, and the first portion of the base is aligned with the prosthetic portion associated with the dental prosthesis, and the dental prosthesis is aligned with the second portion of the base; the base and the framework are connected to form a partial denture.

[0032] In some embodiments, the second part of the base and the dental prosthesis are integrally formed using base material and dental prosthesis material through additive manufacturing.

[0033] A second aspect of this application provides a method for manufacturing a dental product, the dental product comprising a first body and a second body connected to the first body, the method comprising: obtaining an initial data model of the dental product; increasing the thickness of the initial data model of the dental product by a predetermined value along at least one direction to obtain a target data model; integrally manufacturing a target object based on the target data model, wherein the target object comprises a first body portion and a second body portion, the first body portion comprising a first material and the second body portion comprising a second material, wherein the first material and the second material are different; and processing the target object to reduce the thickness of the target object by a predetermined value along at least one direction, thereby obtaining the dental product.

[0034] In some embodiments, the predetermined value is 30 μm to 3000 μm, preferably 50 μm to 2000 μm, preferably 100 μm to 1000 μm, and preferably 150 μm to 400 μm.

[0035] In some embodiments, at least one direction includes at least one of the following: the direction along the X-axis of the space in which the data model is located, the direction along the Y-axis of the space in which the data model is located, the direction along the Z-axis of the space in which the data model is located, or the normal direction along the contour of the data model.

[0036] In some embodiments, integral manufacturing of the target object includes: manufacturing the target object using a multi-material photopolymerization 3D printing device.

[0037] In some embodiments, processing the target object includes cutting the target object using machining equipment.

[0038] In some embodiments, the machining equipment sets the cutting path based on an initial data model of the dental product.

[0039] In some embodiments, the method further includes: providing a locator model for an initial data model of a dental product, the locator model being configured to be integrally formed with the target data model, and the locator formed by the locator model being capable of being mounted on a machining equipment.

[0040] In some embodiments, processing the target object includes grinding and polishing the target object.

[0041] A third aspect of this application provides a method for manufacturing multiple dental products, each dental product including a first body and a second body connected to the first body, characterized by comprising: acquiring initial data models of the multiple dental products; increasing the thickness of the initial data model of each dental product to obtain multiple target data models of the multiple dental products; additively manufacturing multiple target objects based on the multiple target data models, wherein each target object includes a first body portion and a second body portion, the first body portion including a first material, the second body portion including a second material, wherein the first material and the second material are different; and subtractively manufacturing the multiple target objects to reduce the thickness of the target objects, thereby obtaining multiple dental products.

[0042] In some embodiments, additive manufacturing of multiple target objects includes: simultaneously manufacturing multiple target objects, wherein the multiple target objects are connected via multiple connectors.

[0043] In some embodiments, additive manufacturing of multiple target objects includes: the additive manufacturing layer thickness is 20 μm to 300 μm.

[0044] In some embodiments, the method further includes: adjusting the process parameters of additive manufacturing and the process parameters of subtractive manufacturing so that the total time of additive manufacturing is adapted to the total time of subtractive manufacturing.

[0045] In some embodiments, the process parameters for additive manufacturing include at least one of the following: layer thickness, number of target data models in a single plate, exposure time, and platform lifting time; the process parameters for subtractive manufacturing include at least one of the following: cutting path, number of cutting operations, and polishing time.

[0046] A fourth aspect of this application provides a system for manufacturing an object, the system comprising: a processor configured to increase the thickness of a data model of the object, the object including a first portion formed of at least a first material and a second portion formed of at least a second material, wherein the first material is different from the second material; a multi-material 3D printing apparatus configured to manufacture the object having the increased thickness based on the data model with the increased thickness; and a post-processing apparatus configured to remove the increased thickness portion of the object by subtractive manufacturing.

[0047] The fifth aspect of this application provides a method for manufacturing an object, the object including a first body and a second body connected to the first body, the method including: obtaining an initial data model of the object; increasing the thickness of the data model of the object to obtain a target data model; obtaining a target object by additive manufacturing based on the target data model, wherein a first part of the target object includes a first material and a second part of the target object includes a second material, wherein the first material and the second material are different; and performing subtractive manufacturing on the target object to reduce the thickness of the target object, so that the dimensions of the processed target object are substantially the same as those of the initial data model.

[0048] A sixth aspect of this application provides a method for manufacturing a dental object, the dental object including a base and teeth, the method comprising: obtaining an initial data model of the dental object; increasing the thickness of the initial data model of the dental object by a predetermined value along at least one direction to obtain a target data model; integrally manufacturing the target object based on the target data model, wherein the target object includes a base portion and a tooth portion, the base portion including a first material and the tooth portion including a second material different from the first material; and processing the target object to reduce the thickness of the target object by a predetermined value along at least one direction, thereby obtaining the dental object.

[0049] In some embodiments, the predetermined value is 30 μm to 3000 μm, preferably 50 μm to 2000 μm, preferably 100 μm to 1000 μm, and preferably 150 μm to 400 μm.

[0050] In some embodiments, at least one direction includes at least one of the following: the direction along the X-axis of the space in which the data model is located, the direction along the Y-axis of the space in which the data model is located, the direction along the Z-axis of the space in which the data model is located, or the normal direction along the contour of the data model.

[0051] In some embodiments, integral manufacturing of the target object includes: manufacturing the target object using a multi-material photopolymerization 3D printing device.

[0052] In some embodiments, manufacturing the target object in one piece includes: manufacturing the target object using a multi-material photopolymerization 3D printing device; processing the target object includes: cutting the target object using machining equipment, and / or polishing the target object.

[0053] In some embodiments, the machining equipment sets the cutting path based on an initial data model of the dental object.

[0054] In some embodiments, a locator model is provided for an initial data model of a dental object. The locator model is configured to be integrally formed with the target data model, and the locator formed by the locator model can be mounted onto a machining equipment.

[0055] A seventh aspect of this application provides a method for manufacturing multiple dental objects, comprising: acquiring initial data models of multiple dental objects; increasing the thickness of the initial data model of each dental object to obtain multiple target data models of the multiple dental objects; additively manufacturing multiple target objects based on the multiple target data models, wherein each target object includes a base portion and a tooth portion, the base portion including a first material and the tooth portion including a second material different from the first material; and subtractively manufacturing the multiple target objects to reduce the thickness of the target objects, thereby obtaining multiple dental objects.

[0056] In some embodiments, the method further includes: adjusting the process parameters of additive manufacturing and the process parameters of subtractive manufacturing so that the total time of additive manufacturing is adapted to the total time of subtractive manufacturing.

[0057] In some embodiments, the process parameters for additive manufacturing include at least one of the following: layer thickness, number of target data models in a single plate, exposure time, and platform lifting time; or, the process parameters for subtractive manufacturing include at least one of the following: cutting path, number of cutting operations, and polishing time.

[0058] In some embodiments, additive manufacturing of multiple target objects includes: simultaneously manufacturing multiple target objects, wherein the multiple target objects are connected via multiple connectors.

[0059] In some embodiments, additive manufacturing of multiple target objects includes: the additive manufacturing layer thickness is 20 μm to 300 μm.

[0060] By applying the aforementioned technical solution of this application, an initial data model of a dental product or dental object is obtained; the thickness of the initial data model of the dental product or dental object is increased by a predetermined value in at least one direction to obtain a target data model; by setting the predetermined value, preparation for post-printing processing can be made, thereby ensuring the accuracy of the final product size. Using multi-material printing technology, different materials, such as denture bases and teeth, can be integrally molded in the same manufacturing process, improving production efficiency and reducing costs. The target object is processed to reduce its thickness by a predetermined value in at least one direction, thereby obtaining the dental product or dental object. By precisely controlling the reduction of the predetermined thickness, the size of the dental product or dental object is ensured to be consistent with the design model, thereby achieving high-quality manufacturing of the dental product or dental object. This realizes the entire process of printing and post-processing, thereby reducing manual intervention. Therefore, the technical solution of this application effectively solves the problem of requiring manual grinding and polishing in related technologies.

[0061] Furthermore, cutting is beneficial for eliminating layer textures generated during 3D printing. In manufacturing objects made of multiple materials, traditional methods involve creating different parts of the object using a single material, then assembling them using complementary structural features or adhesives. This application directly prints a thickened version of the aforementioned object using multiple materials, and then uses cutting to remove unnecessary features. This effectively avoids assembly problems caused by printing precision issues while maintaining the object's accuracy.

[0062] The eighth aspect of this application provides a method for manufacturing dental products using multi-material partitioned printing. The method includes: acquiring a digital three-dimensional model of the target dental product; dividing the three-dimensional model into regions to generate at least two sub-region digital three-dimensional models with spatial coordinate relationships; performing Boolean operations on each sub-region digital three-dimensional model to form a partitioned structure adapted for multi-material printing; and using different materials that match the partitioned structure to perform integrated 3D printing based on each sub-region digital three-dimensional model to obtain the dental product.

[0063] In some embodiments, the target dental product includes at least one of complete dentures, invisible dentures, crowns and bridges, full-mouth implant restorations, or jaw pads.

[0064] In some embodiments, zoning includes partitioning based on at least one of the aesthetic features, mechanical properties, radiometric properties, or soft and hard materials of the dental product.

[0065] In some embodiments, Boolean operations include at least one of Boolean addition, Boolean subtraction, or Boolean intersection.

[0066] In some embodiments, the target dental product is a complete denture, which includes a denture base. Dividing the three-dimensional model into regions to generate at least two sub-regional digital three-dimensional models with spatial coordinate association includes: acquiring the denture digital three-dimensional model; identifying the labial and buccal surface regions of the denture digital three-dimensional model as aesthetic regions, and generating a texture layer sub-model with a predetermined thickness based on preset texture and depth parameters; removing the texture layer sub-model from the denture digital three-dimensional model through Boolean subtraction to generate a main denture body sub-model; wherein the texture layer sub-model and the main denture body sub-model are two sub-regional digital three-dimensional models with spatial coordinate association.

[0067] In some embodiments, the method further includes: stripping the tooth socket structure from the main denture body sub-model and extending it to form a root-transparent digital 3D model with a gradient shape; performing a Boolean merge of the root-transparent digital 3D model and the upper tooth digital 3D model, and performing a Boolean subtraction operation between the merged model and the main denture body sub-model to update the main denture body sub-model.

[0068] In some embodiments, the target dental product is a complete denture, which includes an upper tooth portion. Dividing the three-dimensional model into regions to generate at least two sub-regional digital three-dimensional models with spatial coordinate relationships includes: acquiring the upper tooth digital three-dimensional model; identifying the incisal region and the cervical region of the upper teeth; generating an incisal transparent layer sub-model with a finger-like process shape based on the incisal region; generating a cervical tint layer sub-model with a gradually varying thickness based on the cervical region; and subtracting the incisal transparent layer sub-model and the cervical tint layer model sequentially from the upper tooth digital model through Boolean subtraction to generate an intermediate tooth body sub-model; wherein the incisal transparent layer model, the cervical tint layer model, and the intermediate tooth body sub-model are three sub-regional digital three-dimensional models with spatial coordinate relationships.

[0069] In some embodiments, the target dental product is an invisible denture, which includes upper teeth and a denture base. Dividing the three-dimensional model into regions to generate at least two sub-regional digital three-dimensional models with spatial coordinate relationships includes: acquiring a digital three-dimensional model of the upper teeth and a digital three-dimensional model of the denture base with coordinate relationships; identifying and cutting the clasp and labial portion located on the denture base based on a preset tooth position range and tooth cervical margin, and generating them into an independent denture base sub-model including the clasp and labial portion; wherein, the upper teeth digital model, the remaining denture base sub-model after cutting, and the denture base sub-model including the clasp and labial portion are three sub-regional digital three-dimensional models with spatial coordinate relationships.

[0070] In some embodiments, the target dental product is a crown and bridge. Dividing the three-dimensional model into regions and generating at least two sub-region digital three-dimensional models with spatial coordinate relationships includes: acquiring a digital three-dimensional model of the crown and bridge; identifying the incisal region and the labial-buccal neck region of the crown and bridge; generating an incisal transparent layer sub-model with a finger-like process shape based on the incisal region; and generating a neck tinted layer sub-model with a gradually varying thickness based on the labial-buccal neck region.

[0071] By subtracting Boolean operations, the incisal transparent layer sub-model and the cervical shading layer sub-model are subtracted sequentially from the digital 3D model of the target dental product to generate the tooth body sub-model; wherein, the incisal transparent layer model, the cervical shading layer model and the tooth body sub-model are three sub-region digital 3D models with spatial coordinate relationships.

[0072] In some embodiments, the target dental product is a full-mouth implant restoration. Dividing the three-dimensional model into regions to generate at least two sub-regional digital three-dimensional models with spatial coordinate association includes: acquiring a digital three-dimensional model of the full-mouth implant restoration; identifying the interface region on the restoration and expanding it outward by a preset thickness based on the interface region to generate an independent interface sub-model; removing the interface sub-model from the digital three-dimensional model of the restoration through Boolean subtraction to generate a main body sub-model of the restoration; wherein, the interface sub-model is associated with materials with radiopaque properties, and the main body sub-model of the restoration is associated with non-radiopaque materials.

[0073] In some embodiments, the target dental product is a jaw pad. Dividing the three-dimensional model into regions to generate at least two sub-region digital three-dimensional models with spatial coordinate association includes: acquiring the jaw pad digital three-dimensional model; based on the tooth segmentation results, identifying the tooth surface regions in contact with the teeth, and generating a soft inner lining sub-model with a preset thickness based on the tooth surface regions; removing the soft inner lining sub-model from the jaw pad digital model through Boolean subtraction to generate a hard outer shell sub-model; wherein the soft inner lining sub-model is associated with soft materials, and the hard outer shell sub-model is associated with hard materials.

[0074] The dental products provided in this application meet at least one usage requirement. Some dental products manufactured using 3D printing in a single piece eliminate the need for existing manual procedures.

[0075] The method for manufacturing dental products using multi-material partitioned printing provided in this application meets at least one of the following usage requirements: aesthetic performance, gingival simulation, tooth simulation, imaging function, wearing comfort, high wear resistance, and high strength. Based on the integrated 3D printing of some dental products using multi-material integrated printing, it achieves precise integrated printing of multi-performance, multi-color photosensitive resins. This solves the problem of traditional 3D printed dental products requiring step-by-step printing, such as printing the denture base and tooth body separately, and then assembling them by bonding. It avoids manual operation and cumbersome procedures, and also solves problems such as bonding failure and structural instability, improving product strength and oral antibacterial properties. Attached Figure Description

[0076] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings in the embodiments will be briefly described below. It should be understood that the following drawings only show some embodiments of this application and therefore should not be regarded as a limitation on the scope of protection.

[0077] Figure 1 is a schematic diagram of a complete denture according to some embodiments.

[0078] Figure 2 is a schematic diagram of a complete denture according to some embodiments.

[0079] Figure 3 is a schematic diagram of a complete denture according to some embodiments.

[0080] Figures 4A-4B are schematic diagrams of teeth according to some embodiments.

[0081] Figures 5A-5C are schematic diagrams of teeth according to some embodiments.

[0082] Figures 6A-6C are schematic diagrams of teeth according to some embodiments.

[0083] Figure 7 illustrates invisible dentures according to some embodiments.

[0084] Figure 8 shows a denture according to some embodiments.

[0085] Figure 9 illustrates a crown bridge according to some embodiments.

[0086] Figure 10 shows a tooth model according to some embodiments.

[0087] Figure 11 shows a denture according to some embodiments.

[0088] Figure 12 shows another denture according to an embodiment of this application.

[0089] Figure 13 shows teeth according to some embodiments.

[0090] Figure 14 shows a base according to some embodiments.

[0091] Figure 15 shows a schematic diagram of the structural relationship between a partial denture model and a dental model according to some embodiments.

[0092] Figure 16 shows a schematic diagram of a baseboard model provided according to some embodiments.

[0093] Figure 17 shows a schematic flowchart of some embodiments of the method for manufacturing dental objects according to this application.

[0094] Figure 18 shows a schematic flowchart of some embodiments of the method for manufacturing multiple dental objects according to this application.

[0095] Figure 19 shows a flowchart of some embodiments of the method for manufacturing objects according to this application.

[0096] Figure 20 shows a flowchart illustrating some embodiments of the method for multi-material partition printing to manufacture dental products according to this application.

[0097] Figure 21 shows a denture model according to some embodiments.

[0098] Figure 22 shows a tooth model according to some embodiments.

[0099] Figure 23 shows a model of an invisible denture according to some embodiments.

[0100] Figure 24 shows a tooth model according to some embodiments.

[0101] Figure 25 shows a prosthesis model according to some embodiments.

[0102] Figure 26 shows a jaw pad model according to some embodiments. Detailed Implementation

[0103] The following description is merely exemplary in nature and is not intended to limit this application, application, or use. It should be understood that throughout the drawings, the same or similar reference numerals indicate the same or similar parts and features. Those skilled in the art will understand that any components or features of different embodiments can be combined to obtain new embodiments, which also fall within the scope of protection of this application, provided they do not contradict each other.

[0104] This application provides a 3D-printed dental product comprising: a first body including a portion made of a first material; and a second body connected to the first body and including a portion made of a second material, wherein the first material and the second material have different colors or translucency. Specifically, the dental product includes complete dentures, partial dentures, teeth, crowns and bridges, occlusal pads, molar pads, etc. For denture products, the first body is a base, and the second body is a tooth; for tooth products, the first body is the outer surface area of ​​the tooth, and the second body is the inner surface area of ​​the tooth; for occlusal pad and molar pad products, the first body is the inner wearing side, and the second body is the outer occlusal side. By using the first material for the first body and the second material (different from the first material) for the second body, and then 3D printing the dental product with both the first and second bodies in one piece, at least one of the following usage requirements can be achieved: aesthetic performance, gingival simulation, tooth simulation, radiopaqueness, wearing comfort, high wear resistance, and high strength.

[0105] Figure 1 is a schematic diagram of a complete denture according to some embodiments. The complete denture 100 includes a gingival portion (or base) 110 and a dental portion 120. The gingival portion 110 is formed using a first type of material A, and the dental portion 120 is formed using a second type of material B. The gingival portion 110 and the dental portion 120 are different colors.

[0106] Figure 2 is a schematic diagram of a complete denture according to some embodiments. The complete denture 200 includes a gingival portion 210 and a dental portion 220. In some scenarios, the complete denture 200 is not in the patient's mouth and may be damaged by impact or drop. For example, when the patient removes the complete denture from the mouth (e.g., for cleaning), it may unintentionally fall out. Because the complete denture 200 includes a gingival portion 210 formed of a first type of material and a dental portion 220 formed of a second type of material, the complete denture 200 is prone to breakage at the junction of the gingival portion and the dental portion. To at least overcome this problem, a tough material is used at the junction of the gingival portion and the dental portion. In the embodiment shown in Figure 2, the complete denture 200 also includes a connecting portion 230 (shown by dashed lines) made of a third type of material C. The third type of material C is a tough material that is not easily broken in drop tests. In some embodiments, the connecting portion 230 is the same color as the gingival portion 210 or the dental portion 220.

[0107] It is understandable that toughening materials may be used only in a single connection (single tooth part) or in multiple connection parts (multiple tooth parts).

[0108] Figure 3 is a schematic diagram of a complete denture according to some embodiments. The complete denture 300 includes a gingival portion 310 and a dental portion 320. In some scenarios, the complete denture 300 is not in the patient's mouth and may be damaged by impact or drop. For example, when the patient removes the complete denture from the mouth (e.g., for cleaning), it may unintentionally fall out. Since the dental portion 320 of the complete denture 300 may be made of a brittle or fragile material (ceramic material), the dental portion 320 of the complete denture 300 (especially the incisal portion of the anterior teeth) may be damaged by impact. At least to overcome this problem, a tough material is used at the end of the dental portion 320 away from the gingival portion 310. In the embodiment shown in Figure 3, the complete denture 300 also includes a reinforcing portion 330 (shown by dashed lines) made of a third type of material D. The third type of material D is a tough material that is not easily broken in a drop test. In some embodiments, the reinforcing portion 330 is the same color as the dental portion 320.

[0109] It is understandable that toughening materials may be used in a single reinforced section (a single tooth section) or in multiple reinforced sections (multiple tooth sections).

[0110] Figures 4A-4B are schematic diagrams of teeth according to some embodiments. The tooth 400 includes a first portion 410 near the gum line and a second portion 420 away from the gum line during use, the interface between the first portion 410 and the second portion 420 being planar. For aesthetic and commercial success, the tooth 400 is desired to have a gradient or gradation of color, for example, a gradual deepening of the milky white from the first portion 410 to the second portion 420, or a gradual increase in transparency (ideally as shown in Figure 4B).

[0111] The first part 410 of the tooth 400 is made of a first type of material A, and the second part 420 of the tooth 400 is made of a second type of material B.

[0112] Figures 5A-5C are schematic diagrams of teeth according to some embodiments. The tooth 500 includes a first portion 510 near the gum line and a second portion 520 away from the gum line during use, the interface between the first portion 510 and the second portion 520 being non-planar. For aesthetic and commercial success, the tooth 500 is desired to have a gradient or gradation of color, for example, a gradual deepening of the milky white color or a gradual increase in transparency from the first portion 510 to the second portion 520.

[0113] In the embodiments shown in Figures 5A-5C, the second portion 520 is embedded in the first portion 510. Along the direction close to the gum line (or close to the first portion), the cross-sectional area of ​​the second portion 520 gradually decreases, and the change in embedding thickness creates a visually gradient color in the tooth 500. In some embodiments, the white second portion 520 is embedded in the red first portion 510 to a depth of 10% to 50% of the tooth length, preferably 15% to 40%.

[0114] Figure 5A shows two planes 501 and 502 for the tooth 500, with plane 501 closer to the gingiva (not shown) than plane 502. Figure 5B shows a cross-sectional view along plane 501, and Figure 5C shows a cross-sectional view along plane 502, with the dashed line being the boundary between the first portion 510 and the second portion 520. From plane 501 to plane 502, the cross-sectional area of ​​the second portion 520 gradually increases, while the cross-sectional area of ​​the first portion 510 gradually decreases.

[0115] In the embodiments shown in Figures 5A-5C, the first portion 510 substantially encloses the second portion 520.

[0116] Figures 6A-6C are schematic diagrams of teeth according to some embodiments. The tooth 600 includes a first portion 610 on the labial side and a second portion 620 on the lingual side, the interface between the first portion 610 and the second portion 620 being planar or curved. For aesthetic and commercial success, the tooth 600 is desired to have a gradient or gradation of color, for example, a gradual deepening of the milky white color or a gradual increase in transparency from the gum line (not shown) to the tooth.

[0117] In the embodiments shown in Figures 6A-6C, the first portion 610 covers the second portion 620 on the labial side. The cross-sectional area of ​​the second portion 620 gradually decreases along the direction closer to the gingiva (or closer to the first portion).

[0118] Figure 6A shows two planes 601 and 602 for the tooth 600, with plane 601 closer to the gingiva (not shown) than plane 602. Figure 6B shows a cross-sectional view along plane 601, and Figure 6C shows a cross-sectional view along plane 602, with the dashed line being the boundary between the first portion 610 and the second portion 620. From plane 601 to plane 602, the cross-sectional area of ​​the second portion 620 gradually increases, while the cross-sectional area of ​​the first portion 610 gradually decreases.

[0119] In the embodiments shown in Figures 6A-6C, the first portion 610 is on one side of the second portion 620.

[0120] Those skilled in the art will understand that the first part can be designed to shield or surround the second part on at least one side.

[0121] In some embodiments, a complete denture includes a denture base and a plurality of teeth fixed to the denture base, with a relining material applied to the tissue surface of the denture base. In the prior art, self-curing resin is typically used to directly reline the tissue surface of the denture base within the patient's mouth. In this application, when manufacturing a complete denture, for example using light-curing 3D printing, a relining layer (e.g., made of acrylic soft plastic or silicone rubber) is cured onto the tissue surface of the denture base.

[0122] Figure 7 illustrates an invisible denture according to some embodiments. The invisible denture 700 includes clasps 710, gingiva 720, and teeth 730. Prior art, for example, uses one material to manufacture the teeth, and another material to manufacture the gingiva and clasps, which are then bonded together. In this application, the teeth 730 are made of a first-class material A, the gingiva 720 connected to the teeth 730 is made of a second-class material B, and the clasps 710 are made of a third-class material C (e.g., transparent). In this way, the inconspicuousness of the clasps is further enhanced.

[0123] Figure 8 illustrates a denture according to some embodiments. The denture 800 includes a gingiva 810 and a tooth 820, manufactured using, for example, light-curing 3D printing. The tooth 820 has a first end 822 near the gingiva 810 and a second end 824 away from the gingiva 810. For example, for aesthetic or commercial success considerations, the first end 822 has a sharper angle than a normal tooth, and this "sharp" end embeds into the gingiva. Alternatively or additionally, the second end 824 is transparent or translucent, and the remainder of the tooth 820 is white.

[0124] Figure 9 illustrates a crown bridge according to some embodiments. The crown bridge 900 includes at least one crown 910 and a prosthetic crown 920 connected to the crown 910. The crown 910 is used to mount on a cut abutment tooth, and the prosthetic crown 920 is used to replace a missing crown in the patient's mouth. In light-curing 3D printing applications, a single material is typically used to construct the entire crown bridge 900. Recognizing the risk of fracture in practical use, the inventors have provided a solution to strengthen the connection portion 930 between the crown 910 and the prosthetic crown 920. In some embodiments, the connection portion 930 has increased thickness; however, this may be difficult to accommodate small gaps between teeth in the patient's mouth. In some embodiments, the connection portion 930 has higher fracture strength than either the crown 910 or the prosthetic crown 920. It is understood that the connection portion 930 may be made of one or more materials. In some embodiments, the connection portion 930 includes different portions made of different materials.

[0125] Figure 10 illustrates a tooth model according to some embodiments. The tooth model 1000 includes a crown 1010 and a gingiva 1030, which are manufactured as a single unit using, for example, light-curing 3D printing. A color layer 1020 is then manually applied to the gingiva 1030 to obtain the desired tooth model. At least to avoid manual manipulation, different materials are cured separately to form the crown and gingiva. Related manufacturing details are disclosed in Chinese patent applications No. 202411553161.3 and No. 202411553164.7.

[0126] Figure 11 illustrates a denture according to some embodiments. The dental product is a denture 1100, which includes a base 1110 (first body) and teeth 1120 (second body). The base 1110 and teeth 1120 are manufactured as a single unit using, for example, photopolymer 3D printing, by curing different materials to form the base and teeth. In some embodiments, the denture includes complete dentures and partial dentures.

[0127] In some embodiments, the color of the end of the denture base closer to the teeth is lighter than the color of the end of the denture base farther from the teeth. Figure 12 illustrates another denture according to an embodiment of this application. The denture base 1210 of the denture 1200 has a first end A closer to the teeth 1220 and a second end B farther from the teeth 1220. For example, for aesthetic or commercial success reasons, the color of the first end A of the denture base 1210 closer to the teeth 1220 is lighter than the color of the first end B of the denture base 1210 farther from the teeth 1220 to show a realistic visual effect of gums.

[0128] Figure 13 illustrates a tooth according to some embodiments. The tooth 1320 has a first end C near the gum line 1310 (base) and a second end D away from the gum line 1310. The second end D of the tooth 1320 is transparent or translucent, while the rest of the tooth is white to present a realistic tooth appearance.

[0129] The denture fabrication method described in the above embodiments can be manufactured using the integrated technology described in Chinese patent applications No. 202411553161.3 and No. 202411553164.7. Compared to the traditional technique of separately printing the gums and teeth and then bonding them together to fabricate the denture, the technology of this application can achieve integrated printing of the teeth and denture base, avoiding the problem of bacterial accumulation in the bonding area, and enabling different areas to use different colors to achieve a realistic and lifelike effect for the teeth and denture base.

[0130] Figure 14 illustrates a denture base according to some embodiments. The base 1400 includes a portion 1420 made of a third material, which includes a blood-streaked material. In this embodiment, the interior of the base, as the first portion 1410, is printed with the first material, and the surface, as the third portion 1420, is printed with the blood-streaked material. This allows for the fabrication of a complete denture with blood streaks. Specifically, by 3D printing the base portion of the denture, the surface of the base is printed with blood-streaked material to achieve a simulated gingival color, resulting in a highly aesthetically pleasing base. In particular, using the applicant's aforementioned patented technology, when printing the base (gingiva), two material trays are provided. One tray holds conventional gingival material, and the other holds the blood-streaked material. The materials in both trays are alternately printed in the same slice layer to achieve a base with a conventional gingival color on the inside and a simulated gingiva color on the outside. When the denture needs to be printed, a third tray is provided to hold the dental material. The denture with simulated blood streaks is manufactured in one piece by alternately printing the slicing layer containing both teeth and gums in three trays: gum material, regular gum material, and simulated blood streaks material.

[0131] In some embodiments, the fabricated dentures are also considered for use in patient medical examinations. For example, when a patient undergoes an examination using a CBCT scanner, a contrasting material needs to be applied to the teeth before the examination to facilitate visualization of the dentures. At least for the purpose of omitting this step, this application uses a contrasting material during the fabrication of the dentures. For example, a contrasting component is added to the raw resin of the denture. The contrasting material is immediate restoration denture resin (V1.0) or immediate restoration denture model resin produced by Heig Technology.

[0132] In some embodiments, this application provides a jaw pad comprising a wearing side that attaches to the teeth and an opposing occlusal side. Existing jaw pads are made from a single material; if the material is too hard, the patient experiences a poor experience when using the jaw pad; if the material is too soft (i.e., less hard), the degree of deformation of the jaw pad during occlusion may be undesirable. The jaw pad of this application has a wearing side that is less hard than the occlusal side, which satisfies both wearing comfort and occlusal function.

[0133] In some embodiments, the dental product is a molar splint, with a first body enclosing a second body, the first material being harder than the second material; or the first material is a hard material and the second material is a soft material. The molar splint includes a wearing side that attaches to the teeth and an opposing occlusal side. Existing splints are made from a single material; if the material is too hard, the patient experiences a poor experience when using the splint; if the material is too soft (i.e., less hard), the degree of deformation of the splint during occlusion may be undesirable. The molar splint of this application has a wearing side that is softer than the occlusal side (the wearing side is softer than the occlusal side), which satisfies both wearing comfort and occlusal function, and is manufactured as a single piece using, for example, light-curing 3D printing.

[0134] In some embodiments, the dental product is applied to a partial denture, the partial denture including a framework, a dental prosthesis, and a prosthetic portion associated with the dental prosthesis, the framework being configured to be installed onto an abutment tooth; the dental product includes a base, the base including a first portion and a second portion, wherein the framework is sandwiched between the first portion and the second portion, and the first portion of the base is aligned with the prosthetic portion associated with the dental prosthesis, and the dental prosthesis is aligned with the second portion of the base; the base and the framework are connected to form a partial denture.

[0135] In some embodiments, the second part of the base and the dental prosthesis are integrally formed using base material and dental prosthesis material through additive manufacturing.

[0136] Figure 15 shows a schematic diagram of the structural relationship between a partial denture model and a dental mold according to an embodiment of this application. In Figure 15, the dental mold has abutment teeth 1512 and 1514, and a framework 1520 is used to fix it to the abutment teeth 1512 and 1514. The first part 1532 and the second part 1534 of the denture base sandwich the framework 1520 in the middle. The prosthesis (denture) 1540 is arranged on the second part 1534 of the denture base. The prosthesis 1540 and the second part 1534 of the denture base can be printed integrally, for example, by dual-material printing.

[0137] Figure 16 is a schematic diagram of a baseplate model provided in an embodiment of this application. Part (a) of Figure 16 shows the first part 1610 of the baseplate model, i.e., the lower baseplate model; part (b) of Figure 16 shows the second part 1620 of the baseplate model, i.e., the upper baseplate model, which is shown in a schematic diagram of its lingual portion. A support model 1630 can be sandwiched between the first part shown in part (a) and the second part shown in part (b) of Figure 15.

[0138] In one possible implementation of this application, when the manufacturing unit obtains the denture base through additive manufacturing, it can integrally form the second part of the denture base and the dental prosthesis using both the denture base material and the dental prosthesis material. In this way, the dental prosthesis can be integrally printed with the denture base, and the resulting second part of the denture base also includes the dental prosthesis. By integrally printing the dental prosthesis and denture base, the process of bonding the second part of the denture base and the crown is saved, further improving the bonding accuracy between the crown and the second part of the denture base. The specific method for integrally fabricating the dental prosthesis and denture base through additive manufacturing can employ multi-material preparation methods, as described in, for example, the relevant description in Chinese patent application number 202411553161.3, which will not be repeated here.

[0139] Compared to existing technologies that use zirconia cutting to fabricate crowns and then manually bond them to the framework, this application uses resin crowns, which reduces tooth wear. Furthermore, the high strength of zirconia makes it prone to abrasion and unsuitable for dental prostheses. Additionally, bonding zirconia to metal requires specific adhesives, complicating the process. This application's embodiment uses resin crowns, minimizing tooth wear. Moreover, the integrated printing of the dental prosthesis and base eliminates the need for bonding and ensures more accurate positioning of the prosthesis and base.

[0140] In some embodiments, this application provides an orthodontic transfer tray. Similar to the jaw pad of the foregoing embodiments, the orthodontic transfer tray has a first portion and a second portion, wherein the first portion is less rigid than the second portion.

[0141] In the fabrication of dental products, such as dentures, two main technical approaches are currently employed: First, by cutting a resin disc to achieve integrated molding of the dentition and denture base. While this method improves production speed and accuracy, it limits the aesthetics of the gingival margin curve, and manual grinding and polishing are still required after cutting. Second, 3D printing technology is used to print the denture base and dentition separately, and then the patient's own denture base or tooth material is used as an adhesive for manual bonding. Although 3D printing technology can quickly generate components, bonding and subsequent grinding and polishing still rely on manual operation, increasing the production cycle and cost. Specifically, photopolymer 3D printing technology is particularly prominent in the fabrication of complete dentures, especially technologies such as DLP, LCD, and SLA 3D printing. 3D printers can accurately print denture bases and dentition, but the post-processing includes support removal, cleaning, bonding, grinding, and polishing. The bonding step requires precise manual alignment of the denture base and dentition, and the use of adhesive for connection, which not only tests the operator's professional skills but also consumes a significant amount of time. Grinding and polishing are even more time-consuming and labor-intensive processes. Operators need to carefully remove the support structures and layer textures generated during the printing process, as well as perform fine surface treatment.

[0142] In view of the above problems, the second aspect of this application provides a method for manufacturing dental products to solve the problem that manual polishing is required in related technologies, which increases production costs.

[0143] In some implementations, as shown in Figure 17, a method for manufacturing a dental product, the dental product comprising a first body and a second body connected to the first body, such as a dental product comprising a denture base and teeth, the method for manufacturing the dental product includes:

[0144] Obtain the initial data model for dental products;

[0145] Along at least one direction, the thickness of the initial data model of the dental product is increased by a predetermined value to obtain the target data model;

[0146] Based on the target data model, the target object is manufactured as a whole, wherein the target object includes a first main body part (e.g., a basement part) and a second main body part (e.g., a tooth part), the first main body part includes a first material, and the second main body part includes a second material different from the first material;

[0147] The target object is processed to reduce its thickness by a predetermined value in at least one direction, thereby obtaining a dental product.

[0148] The technical solution of this embodiment obtains an initial data model of a dental product; the thickness of the initial data model of the dental product is increased by a predetermined value in at least one direction to obtain a target data model; by setting the predetermined value, preparation for post-printing processing can be made, thereby ensuring the accuracy of the final product size. Using multi-material printing technology, different materials, such as denture bases and teeth, can be integrally molded in the same manufacturing process, improving production efficiency and reducing costs. The target object is processed to reduce its thickness by a predetermined value in at least one direction, thereby obtaining the dental product. By precisely controlling the reduction of the predetermined thickness, the size of the dental product is ensured to be consistent with or substantially consistent with the design model, thus achieving high-quality dental product manufacturing. This realizes the entire process of printing and post-processing, thereby reducing manual intervention. Therefore, the technical solution of this embodiment effectively solves the problem in related technologies where manual grinding and polishing are required, thus increasing production costs.

[0149] In some implementations, the above-described methods for manufacturing dental products can be applied to the manufacture of complete dentures, partial dentures, teeth, crowns and bridges, jaw pads, molar pads, etc., which will not be elaborated further here.

[0150] As shown in Figure 17, in some embodiments, the predetermined value is between 30 μm and 3000 μm. The range of the predetermined value, for example, is set between 30 μm and 1000 μm, taking into account the shrinkage rate of different materials during the printing process. This range not only considers the physical properties of the material but also balances printing accuracy and efficiency, ensuring that the pre-thickened portion can be accurately removed by a cutting machine in the post-processing stage of dental products to achieve the designed dimensions. Furthermore, by adjusting the predetermined value, it is possible to flexibly adapt to different materials and printing conditions, improving manufacturing flexibility and product quality.

[0151] The predetermined value is, for example, 30 μm to 3000 μm, preferably 50 μm to 2000 μm, preferably 100 μm to 1000 μm, preferably 150 μm to 400 μm, for example 50 μm to 800 μm, for example 100 μm to 500 μm, for example 150 μm to 500 μm, for example 200 μm to 400 μm.

[0152] Specifically, the predetermined value can be 160μm, 170μm, 180μm, 190μm, 200μm, 210μm, 220μm, 230μm, 240μm, 250μm, 260μm, 270μm, 280μm, 290μm, 300μm, 310μm, 320μm, 330μm, 340μm, 350μm, 360μm, 370μm, 380μm, 390μm, 400μm, 410μm, 420μm, 430μm, 440μm, 450μm, 460μm, 470μm, 480μm, 490μm, or other sizes.

[0153] As shown in Figure 17, in some embodiments, at least one direction includes at least one of the following: along the X-axis direction of the space where the data model is located, along the Y-axis direction of the space where the data model is located, along the Z-axis direction of the space where the data model is located, or along the normal of the contour of the data model.

[0154] By increasing the thickness of the data model in all three directions, the product achieves the expected dimensions and appearance. Furthermore, the increased thickness in the three dimensions better adapts to the machining path of the cutting machine, thereby improving machining efficiency.

[0155] As shown in Figure 17, in some embodiments, the integrated manufacturing of the target object includes: manufacturing the target object using a multi-material photopolymerization 3D printing device. Using multi-material photopolymerization 3D printing technology, different materials for the dental base and teeth can be printed simultaneously in one printing process, simplifying the manufacturing process. As shown in Figure 17, in some embodiments, processing the target object includes: cutting the target object using machining equipment. The printed target object is cut by the machining equipment to remove surface textures and improve surface smoothness. Furthermore, the machining equipment uses a high-speed rotating cutter to cut the target object to achieve the desired surface finish.

[0156] The above setup not only ensures the smoothness of the complete denture surface, but also reduces the time and cost of subsequent manual polishing.

[0157] As shown in Figure 17, in some embodiments, the machining equipment sets the cutting path based on an initial data model of the dental product. This setting enables automatic calculation of the cutting path, thereby achieving accurate cutting.

[0158] Specifically, CAM software can receive data from pre-processing software and automatically calculate the cutting path to achieve precise cutting. Furthermore, the CAM software generates the optimal cutting path based on the shape and dimensions of the data model, as well as positioning marker information. This ensures automation and high precision in the cutting process, reducing scrap rates.

[0159] As shown in Figure 17, in some embodiments, the method further includes providing a locator model for an initial data model of the dental product. The locator model is configured to be integrally formed with the target data model, and the locator formed by the locator model can be mounted onto a machining equipment. The locator ensures that the cutting machine can accurately identify and position the target object. Specifically, the locator model provides a stable fixing point for the cutting machine through a tight connection with the target object. This ensures improved accuracy and stability of the cutting process and reduces product quality problems caused by inaccurate positioning.

[0160] As shown in Figure 17, in some embodiments, processing the target object includes grinding and polishing the target object. The target object after cutting is ground and polished using a polishing wheel on a cutting machine or an eddy current grinding machine to improve surface smoothness. Specifically, the polishing wheel or grinding machine removes minor surface imperfections through high-speed rotation and friction, achieving a smooth effect.

[0161] The technology in this embodiment enables the surface of complete dentures to achieve an ideal polishing state, improving the aesthetics and comfort of the product.

[0162] According to a third aspect of this application, a method for manufacturing multiple dental products is provided, as shown in FIG18. The method for manufacturing multiple dental products in this embodiment includes:

[0163] Obtain initial data models for multiple dental products;

[0164] Increase the thickness of the initial data model for each dental product to obtain multiple target data models for multiple dental products;

[0165] Based on multiple target data models, multiple target objects are additively manufactured, each target object including a base plate part and a tooth part. The base plate part includes a first material, and the tooth part includes a second material different from the first material.

[0166] Subtractive manufacturing is performed on multiple target objects to reduce their thickness, thereby obtaining multiple dental products.

[0167] Production efficiency is improved by printing multiple denture models simultaneously. Specifically, layout software is used to arrange multiple models, ensuring that the number printed is maximized within a limited space. This enables mass production and reduces costs.

[0168] As shown in Figure 18, in some embodiments, additive manufacturing of multiple target objects includes simultaneously manufacturing multiple target objects, which are connected by multiple connectors. Connecting multiple target objects using connectors during the printing process facilitates batch processing. The connector design must consider fragility and stability during subsequent cutting and polishing. Specifically, the technology in this embodiment simplifies the production process and improves automation.

[0169] As shown in Figure 18, in some embodiments, additive manufacturing of multiple target objects includes layer thicknesses of 20 μm to 300 μm, for example 50 μm to 250 μm, or for example 100 μm to 200 μm. By adjusting the layer thickness during the 3D printing process, printing speed and surface quality are balanced. The selection of layer thickness must consider both printing efficiency and the feasibility of subsequent cutting. The cured layer thickness may be one or more times the layer thickness of the slice. For example, during the slicing process, the layer thickness of a single slice is 40 μm, but the actual cured layer thickness is 40 μm, 80 μm, or 120 μm.

[0170] The technology in this embodiment can ensure printing speed while maintaining good surface quality and cutting performance.

[0171] As shown in Figure 18, in some embodiments, the method further includes adjusting the process parameters of additive manufacturing and subtractive manufacturing to adapt the total time of additive manufacturing to the total time of subtractive manufacturing. By adjusting the process parameters of printing and cutting, the two are matched, thereby improving overall production efficiency.

[0172] Specifically, the adjustment of process parameters must be based on equipment capabilities and product requirements to ensure a smooth production process. This enables the technology in this embodiment to achieve seamless integration of printing and cutting, reducing waiting time and improving equipment utilization.

[0173] As shown in Figure 18, in some embodiments, the additive manufacturing process parameters include at least one of the following: layer thickness, number of target data models in a single plate, exposure time, and platform lifting time;

[0174] As shown in Figure 18, in some embodiments, the process parameters for subtractive manufacturing include at least one of the following: cutting path, number of cuts, and polishing time. By precisely controlling the printing and cutting process parameters, high-quality and high-efficiency production can be achieved. Each process parameter directly affects the quality of the final product and production efficiency.

[0175] The technology in this embodiment can ensure the controllability and consistency of the production process and improve product quality.

[0176] This technical solution involves an automated post-processing technology for complete dentures. Starting from acquiring the initial data model, the processor automatically adjusts the model thickness, and a multi-material 3D printing device is used to manufacture the target object in one piece, including different material parts of the denture base and teeth.

[0177] Subsequently, the target object is sent to the post-processing equipment, where it is cut by a cutting machine and polished by a polishing wheel or an eddy current grinding machine to remove surface textures and excess material, ultimately obtaining a dental product that is consistent with or substantially consistent with the dimensions of the initial data model. Throughout the entire process, the processor, printing equipment, and post-processing equipment work together automatically through data transmission and signal control, reducing manual intervention and improving production efficiency and product quality.

[0178] Furthermore, by optimizing process parameters such as layer thickness, exposure time, and cutting path, high efficiency and stability in the production process are ensured. During mass production, multiple target objects are connected via connectors for unified processing, further improving production efficiency. The entire process embodies automation, intelligence, and high efficiency, providing a completely new solution for the production of complete dentures.

[0179] Obviously, those skilled in the art should understand that the modules or steps of this application described above can be implemented using general-purpose computing devices. They can be centralized on a single computing device or distributed across a network of multiple computing devices. They can be implemented using computer-executable program code, and thus can be stored in a storage device for execution by a computing device. In some cases, the steps shown or described can be performed in a different order than those presented here, or they can be fabricated as separate integrated circuit modules, or multiple modules or steps can be fabricated as a single integrated circuit module. Thus, this application is not limited to any particular combination of hardware and software.

[0180] According to a fourth aspect of this application, a system for manufacturing an object is provided, the system for manufacturing an object in this embodiment comprising:

[0181] A processor configured to increase the thickness of a data model of an object, the object comprising a first portion formed of at least a first material and a second portion formed of at least a second material, the first material being different from the second material; a multi-material 3D printing apparatus configured to manufacture an object having increased thickness based on the data model with increased thickness; and a post-processing apparatus configured to remove the increased thickness portion of the object by subtractive manufacturing.

[0182] By building an integrated manufacturing system, automated production from data model to finished product can be achieved. Specifically, processors, printing equipment, and post-processing equipment work together through data transmission and signal control.

[0183] The technology in this embodiment can provide an efficient, stable, and highly automated production environment.

[0184] According to a fifth aspect of this application, a method for manufacturing an object is provided, as shown in FIG19. The method for manufacturing an object in this embodiment includes:

[0185] Obtain the initial data model of the object;

[0186] Increase the thickness of the object's data model to obtain the target data model;

[0187] Based on the target data model, the target object is obtained by additive manufacturing, wherein the first part of the target object includes a first material and the second part of the target object includes a second material that is different from the first material.

[0188] The target object is manufactured using subtractive processing to reduce its thickness, ensuring that the dimensions of the processed object are essentially consistent with the initial data model. It is understandable that manufacturing errors are unavoidable; therefore, the dimensions of the processed target object are essentially consistent with the initial data model.

[0189] By using a multi-material printer and a cutting machine in combination, automated post-processing of complete dentures is achieved. The thickness of the object model is increased before printing, and then excess material is removed by cutting to achieve the same dimensions as the original data model.

[0190] This allows the present embodiment to significantly reduce manual intervention, lower production costs, and improve production efficiency and product quality.

[0191] Specifically, by adding a preset thickness to the data model, then using multi-material 3D printing technology to form a single piece, and finally removing the pre-thickened material through precise post-processing, efficient and precise manufacturing of objects is achieved. The increase in preset thickness takes into account the shrinkage characteristics of the materials, ensuring the accuracy of the final dimensions. The application of multi-material 3D printing technology allows for the use of multiple materials in a single manufacturing process, improving product diversity and applicability. Precise control of post-processing solves the problems of dimensional deviations and poor surface quality in traditional manufacturing methods, improving the precision and aesthetics of the products.

[0192] According to a sixth aspect of this application, a method for manufacturing a dental object is provided, the dental object including a base and teeth, characterized in that it includes: obtaining an initial data model of the dental object; increasing the thickness of the initial data model of the dental object by a predetermined value along at least one direction to obtain a target data model; integrally manufacturing the target object based on the target data model, wherein the target object includes a base portion and a tooth portion, the base portion including a first material and the tooth portion including a second material different from the first material; and processing the target object to reduce the thickness of the target object by a predetermined value along at least one direction, thereby obtaining the dental object.

[0193] According to a seventh aspect of this application, a method for manufacturing multiple dental objects is provided, comprising: obtaining initial data models of multiple dental objects; increasing the thickness of the initial data model of each dental object to obtain multiple target data models of the multiple dental objects; additively manufacturing multiple target objects based on the multiple target data models, wherein each target object includes a base portion and a tooth portion, the base portion including a first material and the tooth portion including a second material different from the first material; and subtractively manufacturing the multiple target objects to reduce the thickness of the target objects, thereby obtaining multiple dental objects.

[0194] The specific implementation methods of the sixth and seventh aspects described above can be referred to the specific embodiments of the second, third, fourth and fifth aspects described above, and will not be repeated here.

[0195] The eighth aspect of this application provides a method for manufacturing dental products using multi-material partition printing, which satisfies at least one of the following usage requirements: aesthetic performance, gingival simulation, tooth simulation, imaging function, wearing comfort, high wear resistance, and high strength. As shown in Figure 20, the multi-material partition printing method for manufacturing dental products in this embodiment includes:

[0196] Obtain a digital 3D model of the target dental product;

[0197] Divide the 3D model into regions to generate at least two sub-region digital 3D models with spatial coordinate relationships;

[0198] Boolean operations are performed on the digital 3D models of each sub-region to form a partitioned structure suitable for multi-material printing;

[0199] Using different materials that match the partitioned structure, dental products are 3D printed in one piece based on the digital 3D model of each sub-region.

[0200] This method combines the partitioning of digital 3D models with multi-material printing. By dividing the digital 3D model of dental products into functional or aesthetic partitions and associating different partitions with different printing materials, a dental product with composite properties can be formed in a single printing process, thereby optimizing the performance and aesthetics of the dental product.

[0201] Specifically, the first step is to obtain a digital 3D model of the target dental product. This model can be obtained by acquiring intraoral data from a patient using an oral scanner, or by exporting the product design after completing the product design using professional dental design software. The common file format for digital 3D models is STL.

[0202] Next, the acquired 3D model is divided into regions. This step, based on a pre-defined partitioning strategy, divides the model into at least two sub-regional digital 3D models with spatial coordinate relationships. The partitioning strategy can be based on various considerations, such as aesthetic features, mechanical properties, imaging capabilities, or material requirements. For example, it can be based on aesthetic features (e.g., translucent areas at tooth incisors, areas with blood streaks in the gums), mechanical properties (e.g., a hard outer shell and a soft inner lining), functional requirements (e.g., imaging interfaces), or material properties (e.g., materials of different colors and hardness). Through region partitioning, at least two sub-regional digital 3D models with spatial coordinate relationships are generated, ensuring that these sub-models can be accurately combined in subsequent printing.

[0203] After the regions are divided, Boolean operations, including Boolean addition, subtraction, and intersection, are performed on the digital 3D models of each sub-region. These operations precisely construct the boundaries of each partition structure, ensuring that they fit perfectly together to form a partition structure suitable for multi-material printing. For example, Boolean subtraction can be used to extract thin-layer regions from the original model that require printing with different materials.

[0204] Finally, the digital 3D model data of each sub-region is input into a multi-material 3D printing device. Based on the spatial coordinate relationships of each model, the printing device uses different matching materials for integral printing, ultimately obtaining the target dental product composed of multiple materials. Because all sub-models are treated as a whole and completed in the same printing task, the material layers are tightly bonded, eliminating the need for subsequent bonding and assembly, significantly improving the overall performance and precision of the product. The specific method for integrally manufacturing dental products using 3D printing equipment can employ multi-material preparation methods, as described in Chinese patent applications No. 202411553161.3 and No. 202411553164.7, and will not be elaborated upon here.

[0205] In some embodiments, taking complete dentures as an example, aesthetic optimization is performed on the denture base to achieve a biomimetic blood vessel effect in natural gum tissue.

[0206] First, obtain the completed design of the complete denture base digital 3D model (e.g., STL format) from external design software as the base digital model.

[0207] In the region segmentation step, the system automatically identifies the edge and lower edge information of the base, determining the lip and cheek side of the base as the aesthetic processing area. Subsequently, the aesthetic area is segmented. A pre-stored image with blood vessel texture is used to apply a texture to this area. To achieve a three-dimensional blood vessel effect, the system maps the blood vessel texture onto the three-dimensional surface using random projection according to a preset depth range (e.g., 0.8mm to 2mm), generating a blood vessel texture layer sub-model with a predetermined thickness (e.g., retaining a thickness of 0.8mm to 1.2mm), and saving it as independent STL data.

[0208] Next, Boolean operations are performed: through Boolean subtraction, the blood vessel texture layer sub-model is removed from the original basement digital model, for example, the space occupied by the blood vessel layer is "cut out" from the original basement, thereby generating the main basement body sub-model. At this point, the blood vessel texture layer sub-model and the main basement body sub-model have a precise spatial coordinate relationship.

[0209] Figure 21 shows denture models according to some embodiments of this application. As shown in Figure 21, the denture base of denture model 2100 (shown in Figure 21(a)) includes a main base body sub-model 2110 and a blood streak texture layer sub-model 2120. After obtaining the digital three-dimensional model of denture 2100, the main base body sub-model 2110 and the blood streak texture layer model 2120 can be generated by the above method. Combined with the data three-dimensional model of tooth sub-model 2130, the denture with blood streaks can be obtained by integral manufacturing using a 3D printing device (shown in Figure 21(b)).

[0210] To further enhance the simulation accuracy, this embodiment also includes processing the root projection effect. Specifically, the system extracts the socket structure from the main denture body sub-model to form separate socket STL data, and extends it downwards to form a digital 3D root projection model. The generation parameters of this root projection model are set such that the distance from the labial side of the denture body gradually increases with depth, while the mesiodistal width gradually decreases with depth, thereby simulating the gradual projection effect of natural tooth roots. The root projection model is Boolean-added with the upper tooth digital 3D model (e.g., STL data) to form new upper tooth STL data; then, the merged model is Boolean-subtracted from the main denture body sub-model to update the main denture body sub-model, making it form a precise space to accommodate the tooth root.

[0211] Finally, the sub-model of the blood vessel texture with spatial coordinate association and the updated main denture body sub-model are sent to the 3D printing equipment. The blood vessel texture sub-model is printed using a material with a biomimetic red color (such as resin containing red pigment), and the main denture body sub-model is printed using the denture body material (such as pink resin). After the one-piece printing is completed, a denture base with realistic blood vessel effect and tooth root transparency is formed. The printed denture effect of this implementation can be seen in Figure 12.

[0212] In some embodiments, aesthetic optimization is performed on the upper teeth portion of a complete denture to achieve a natural tooth gradient effect with translucent incisal edges and darker neck color.

[0213] First, a digital 3D model of the upper teeth is acquired. In the region segmentation step, the system analyzes the upper tooth model, identifying two key regions: the incisal region (approximately 1 / 3 to 1 / 2 of the crown) and the labial cervical region. For the incisal region, a translucent incisal layer sub-model with finger-like projections is generated. This finger-like projection structure has a predetermined thickness at the incisal edge, gradually transitioning to zero thickness towards the center of the tooth. For the labial cervical region, the system employs a gradient thickness stripping design, with the stripping thickness linearly transitioning from 0 mm to a preset value of 0.8 mm to 1.2 mm from the center to the neck, forming a separate cervical shading layer sub-model.

[0214] Then, Boolean operations are performed: first, the digital model of the upper teeth is subtracted from the incisal translucency sub-model to obtain a tooth sub-model with finger-like processes (e.g., STL data); next, this tooth sub-model is subtracted from the cervical shading sub-model to obtain the remaining intermediate tooth sub-model. Finally, three sub-regional digital 3D models with spatial coordinate relationships are generated: the incisal translucency sub-model, the cervical shading sub-model, and the intermediate tooth sub-model.

[0215] The data for these three sub-models were transmitted to a multi-material 3D printing device, and each was printed using different materials: the incisal transparent layer sub-model used a translucent resin material, the cervical colored layer sub-model used a darker, gum-colored resin, and the middle tooth body sub-model used dentin-colored resin. After the one-piece printing was completed, the resulting denture tooth exhibited a natural color and transparency gradient from the incisal edge to the cervical region, possessing extremely high aesthetic performance.

[0216] Figure 22 illustrates a tooth model according to some embodiments of this application. As shown in Figure 22, the tooth model 2200 includes an incisal region (approximately 1 / 3 to 1 / 2 of the crown incisively) and a labial cervical region 2220. After obtaining the digital 3D model of the tooth 2200, an incisal transparent layer sub-model 2210, a cervical tinted layer sub-model 2220, and an intermediate tooth body sub-model 2230 are obtained using the method described above. These are then integrally manufactured using a 3D printing device to obtain a denture tooth with gradient colors, thereby improving aesthetic performance.

[0217] In some embodiments, taking the optimized design and manufacturing of invisible dentures as an example, the aesthetics are improved by designing the clasps and part of the base as independent zones and printing them with tooth-colored or transparent materials.

[0218] First, obtain the completed digital 3D model of the invisible denture from external design software, which includes the digital 3D model of the upper teeth and the digital 3D model of the denture base with coordinate relationships.

[0219] In the region segmentation step, the system processes the denture base data. Specifically, based on the cervical margin height and shape determined by the upper tooth design, the cervical margin is copied to the adjacent denture base area. Based on this, the system automatically identifies and cuts clasps located within the preset tooth position range (e.g., tooth position 4-4) and portions of the labial denture base that are higher than the normal cervical margin, generating them as independent clasp and labial denture base sub-models.

[0220] After the above processing, the original invisible denture model is divided into three sub-region digital 3D models with spatial coordinate association: the upper tooth sub-model (which remains unchanged), the base sub-model after cutting (i.e., the base body with the clasp and labial high part removed), and the newly generated base sub-model including the clasp and labial side.

[0221] The data for these three sub-models were transmitted to a multi-material 3D printer. The upper tooth sub-model and the remaining base sub-model were printed using traditional denture base materials (such as pink resin), while the clasp and labial base sub-models were printed using tooth-colored or transparent resin materials with higher aesthetic performance. After the one-piece printing was completed, the clasp part was similar in color to the tooth, enhancing its concealment and significantly improving the overall aesthetic effect of the invisible denture.

[0222] Figure 23 illustrates a model of an invisible denture according to some embodiments of this application. As shown in Figure 23, the denture model 2300 includes an upper tooth sub-model 2310, a base sub-model 2320 remaining after cutting, and a newly generated base sub-model 2330 including clasps and labial surfaces. After obtaining the digital three-dimensional model of the denture 2300, the aforementioned sub-models are obtained by processing them using the above method. These sub-models are then manufactured integrally using a 3D printing device to obtain an invisible denture with tooth-colored or transparent clasps.

[0223] In some embodiments, aesthetic optimization is performed on crown and bridge restorations and all-on-X implant restorations to achieve a color gradation similar to natural teeth.

[0224] First, obtain the STL data of the crown bridge or All-on-X restoration as a digital model of the restoration.

[0225] In the region segmentation step, the system analyzes the restoration model. A translucent incisal layer sub-model with finger-like projections is generated in the incisal region. In the labial / buccal cervical region, a cervical stained layer sub-model is generated, with a thickness gradually increasing from 0 mm to 0.8 mm to 1.2 mm from the upper (incisal / cusp direction) towards the neck.

[0226] By subtracting the incisal translucency sub-model and the cervical shading sub-model sequentially from the original digital model of the restoration, the tooth structure sub-model is obtained. This results in three sub-regional digital 3D models with spatial coordinate relationships: the tooth structure sub-model, the incisal translucency sub-model, and the cervical shading sub-model.

[0227] The data from these three sub-models were transmitted to a multi-material 3D printing device, each matched with a different material: the tooth body sub-model used dentin-colored high-strength resin, the incisal edge transparent layer sub-model used highly translucent resin, and the cervical staining layer sub-model used resin with high color saturation. After being printed in one piece, the restoration exhibited a natural aesthetic effect with translucent incisal edges, deep color at the cervical region, and distinct layers.

[0228] Figure 24 illustrates a tooth model according to some embodiments of this application. As shown in Figure 24, the tooth model 2400 includes a tooth body sub-model 2410, an incisal edge translucent layer sub-model 2420, and a cervical stigma layer model 2430. After obtaining the digital three-dimensional model of the tooth 2400, the aforementioned sub-models are obtained through the above-described method. These sub-models are then manufactured in one piece using a 3D printing device to obtain a crown and bridge with high aesthetic performance.

[0229] In some embodiments, for All-on-X prostheses that require postoperative imaging examination, the location of the prosthesis can be visualized in imaging examinations by integrating radiopaque material at the interface site.

[0230] First, a digital 3D model of the full-mouth implant restoration is obtained. During the region segmentation step, the system automatically identifies the interface portion on the restoration used for connection with the implant. After identification, the system extends this interface area outward by a preset thickness (e.g., 1 mm), generating an independent interface sub-model. This interface sub-model precisely encompasses the original interface area.

[0231] Then, a Boolean subtraction operation is performed: the generated interface submodel is subtracted from the original All-on-X restoration digital model, removing the interface portion from the original model to form the restoration body submodel. At this point, the interface submodel and the restoration body submodel have a precise coordinate matching relationship.

[0232] The data from these two sub-models are input into a multi-material 3D printer. The interface sub-model is associated with and printed using a resin material with added developer (such as barium sulfate), while the main body sub-model of the restoration is printed using a conventional high-aesthetic, high-wear-resistant, and high-strength resin material without developer. After the integrated printing is completed, the interface portion of the restoration is clearly visible under imaging examinations such as X-rays, facilitating postoperative assessment by doctors of the restoration's placement and long-term stability, while the main body maintains excellent aesthetic and mechanical properties.

[0233] Figure 25 illustrates a restoration model according to some embodiments of this application. As shown in Figure 25, the restoration model 2500 includes an interface sub-model 2510 and a restoration body sub-model 2520. After obtaining a digital three-dimensional model of the tooth 2500, the aforementioned sub-models are obtained through processing using the method described above. These sub-models are then manufactured as a single unit using a 3D printing device to obtain a restoration with interface imaging.

[0234] In some embodiments, the jaw pad is functionally optimized by combining a soft inner liner with a rigid outer shell, thereby improving patient comfort while ensuring the strength of the jaw pad.

[0235] First, the jaw pad design is completed using the applicant's self-developed AI design software or other professional software, and a digital 3D model of the jaw pad is obtained.

[0236] In the region segmentation step, based on the tooth segmentation results (i.e., the dentition analysis results of the occlusal model), the system automatically identifies and extracts the areas in the occlusal pad model that are in direct contact with the buccal and lingual surfaces of the patient's teeth. Based on the contact surfaces, the system generates a soft inner lining sub-model with a specified thickness (e.g., 1 mm) outward (i.e. towards the teeth) and saves it as separate STL data.

[0237] Then, a Boolean subtraction operation is performed: the generated soft inner lining sub-model is subtracted from the original jaw pad digital model, removing the space occupied by the soft inner lining from the original model to obtain the hard outer shell sub-model. The soft inner lining sub-model and the hard outer shell sub-model have a perfect spatial matching relationship.

[0238] The data from these two sub-models are input into a multi-material 3D printer. The rigid outer shell sub-model is associated with and printed using a high-hardness jaw pad-specific resin (such as HardSplint) to ensure sufficient wear resistance and structural strength during chewing. The soft inner lining sub-model is associated with and printed using a soft silicone-like material to provide cushioning for the teeth and significantly improve wearing comfort. After the one-piece printing is completed, a high-performance jaw pad with a soft inner layer and a strong outer layer is obtained.

[0239] Figure 26 illustrates a jaw pad model according to some embodiments of this application. As shown in Figure 26, the restoration model 2600 includes a soft inner lining sub-model and a hard outer shell sub-model. After obtaining the digital three-dimensional model of the tooth 2500, the aforementioned sub-models are obtained by processing them using the method described above. These sub-models are then manufactured as a single unit using a 3D printing device to obtain a high-performance, comfortable jaw pad.

[0240] The specific methods for producing the aforementioned dental products, including the use of 3D printing equipment and multi-material preparation methods, can be found in the relevant descriptions in Chinese patent applications with application numbers 202411553161.3, 202411553164.7, 202511276305.X, CN202411843355.7, and CN202411843358.0, and will not be repeated here.

[0241] In summary, the method provided in this application achieves multi-material integrated molding of dental products by dividing the digital 3D model of the product into sections and associating different printing materials with different sections. For example, it enables the integrated and precise printing of multi-performance, multi-color photosensitive resins. This method not only significantly improves the aesthetics and functional performance of dental products but also simplifies the manufacturing process and enhances product consistency and reliability. The multi-material photopolymerization 3D printing integrated molding technology allows different parts of dental products, such as the denture base resin and tooth resin, to be simultaneously cured and molded in a single print, solving the cumbersome problem of the traditional "step-by-step manufacturing + bonding" process, greatly simplifying the production process and improving output efficiency. During the integrated printing process, different materials can achieve molecular-level fusion, resulting in a product without interface. The retention force comes from the overall mechanical interlocking, solving the bonding failure problem at its root. Combined with precise adaptation of multi-material properties, the tooth structure can achieve the aesthetic restoration of natural teeth, and the finished product possesses both the mechanical strength required for clinical use and long-term wearing comfort, achieving a high balance between functionality and aesthetics. Compared to separate printed dentures, one-piece printed dentures have a more uniform and shallower staining interface, and the material has a higher density, which can effectively reduce bacterial adhesion and provide a healthier restorative environment for long-term use in the mouth.

[0242] The terms “comprising” and “having” as used herein are inclusive and therefore specify the presence of the stated features, integers, steps, operations, elements, and / or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and / or groups thereof. The method steps, processes, and operations described herein should not be construed as necessarily requiring performance in the particular order discussed or described, unless the order is specifically specified. It should also be understood that additional or alternative steps may be employed.

[0243] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

[0244] The description in this application is merely exemplary in nature, and therefore, variations intended without departing from the essence of this application are within its scope. Such variations should not be considered as departing from the spirit and scope of this application.

Claims

1. A 3D-printed dental product, characterized in that, include: The first body comprises a portion made of a first material; The second body is connected to the first body and includes a portion made of a second material. The first material and the second material have different colors or transparency.

2. The dental product of claim 1, wherein, The second body includes a portion made of a third material, the second material and the third material having different toughness, hardness, or strength.

3. The dental product of claim 1, wherein, The dental product has a base as its first component and a crown as its second component.

4. The dental product according to any one of the preceding claims, characterized in that, The crown includes a portion made of a third material, which has greater toughness than the second material.

5. The dental product according to any one of the preceding claims, characterized in that, The part made of the third material is: The portion of the crown that connects to the base; or The end of the crown that is away from the base.

6. The dental product according to any one of the preceding claims, characterized in that, The base includes a portion made of a third material, which has greater toughness than the second material.

7. The dental product according to claim 1, characterized in that, The dental product in question is a tooth.

8. The dental product according to any one of the preceding claims, characterized in that, The contact interface between the first body and the second body is basically horizontal.

9. The dental product according to any one of the preceding claims, characterized in that, The first body is designed to shield or surround the second body on at least one side.

10. The dental product according to any one of the preceding claims, characterized in that, Along the direction from the first body to the second body, the cross-sectional area of ​​the first body gradually decreases, while the cross-sectional area of ​​the second body gradually increases.

11. The dental product according to claim 1, characterized in that, The dental product described is an invisible denture, the primary component of which is a clasp; or The dental product is a denture, with the gum as the first body and the teeth as the second body. The end of the second body furthest from the gum is transparent or translucent, while the rest of the second body is white; or The dental product is an orthodontic transfer tray, and the hardness of the first body is lower than that of the second body.

12. The dental product according to claim 1, characterized in that, The dental product is a crown bridge, the first body comprising: a first crown installed on the abutment tooth and a prosthetic crown indirectly connected to the first crown; the second body is configured to connect the first crown and the prosthetic crown, wherein the toughness of the second body is greater than that of the first body.

13. The dental product according to claim 1, characterized in that, The dental product is a jaw pad, the first body being the wearing side of the jaw pad, and the second body being the occlusal side of the jaw pad.

14. The dental product according to claim 1, characterized in that, The dental product is a denture, the first body being the base and the second body being the teeth, and the denture includes partial dentures or complete dentures.

15. The dental product according to any one of the preceding claims, characterized in that, The color of the end of the base closer to the tooth is lighter than the color of the end of the base farther from the tooth.

16. The dental product according to any one of claims 7 or 14, wherein the end of the tooth away from the gum line is transparent or translucent.

17. The dental product according to claim 14, characterized in that, The base includes a portion made of a third material, which includes a blood-like material.

18. The dental product according to claim 1, characterized in that, The dental product is a molar pad, in which the first body wraps around the second body, and the hardness of the first material is greater than that of the second material; or the first material is a hard material and the second material is a soft material.

19. The dental product according to claim 1, characterized in that, The dental product is used in partial dentures, which include a framework, a dental prosthesis, and a restorative portion associated with the dental prosthesis, wherein the framework is configured to be installed onto the abutment tooth; The dental product includes a base, the base comprising a first portion and a second portion, wherein the support is sandwiched between the first portion and the second portion, and the first portion of the base is aligned with a restorative portion associated with the dental prosthesis, the dental prosthesis being aligned with the second portion of the base; The base and the bracket are connected to form the partial denture.

20. The dental product according to any one of the preceding claims, wherein the second part of the base and the dental prosthesis are integrally formed by additive manufacturing using base material and dental prosthesis material.

21. A method of manufacturing a dental product, the dental product comprising a first body and a second body connected to the first body, characterized in that, include: Obtain the initial data model for dental products; Along at least one direction, the thickness of the initial data model of the dental product is increased by a predetermined value to obtain the target data model; Based on the target data model, the target object is manufactured as a single unit, wherein the target object includes a first main body part and a second main body part, the first main body part includes a first material, the second main body part includes a second material, and the first material and the second material are different. The target object is processed to reduce its thickness by a predetermined value along at least one direction, thereby obtaining the dental product.

22. The method for manufacturing dental products according to claim 21, characterized in that, The predetermined value is 30 μm to 3000 μm, preferably 50 μm to 2000 μm, preferably 100 μm to 1000 μm, and preferably 150 μm to 400 μm.

23. The method for manufacturing dental products according to claim 21, characterized in that, The at least one direction includes at least one of the following: along the X-axis of the space where the data model is located, along the Y-axis of the space where the data model is located, along the Z-axis of the space where the data model is located, or along the normal of the contour of the data model.

24. The method for manufacturing dental products according to claim 21, characterized in that, The integrated manufacturing target object includes: manufacturing the target object using a multi-material photopolymerization 3D printing device.

25. The method for manufacturing dental products according to claim 21, characterized in that, Processing the target object includes cutting the target object using machining equipment.

26. A method for manufacturing a dental product according to any one of the preceding claims, characterized in that, The machining equipment sets the cutting path based on the initial data model of the dental product.

27. A method for manufacturing a dental product according to any one of the preceding claims, characterized in that, Also includes: A locator model is provided for the initial data model of a dental product. The locator model is configured to be integrally manufactured with the target data model, and the locator formed by the locator model can be installed on a machining equipment.

28. The method for manufacturing dental products according to claim 21, characterized in that, Processing the target object includes grinding and polishing the target object.

29. A method for manufacturing a plurality of dental products, each of the dental products comprising a first body and a second body connected to the first body, characterized in that, include: Obtain initial data models for multiple dental products; Increase the thickness of the initial data model for each dental product to obtain multiple target data models for multiple dental products; Based on the multiple target data models, multiple target objects are manufactured by additive manufacturing. Each target object includes a first main body part and a second main body part. The first main body part includes a first material, and the second main body part includes a second material, wherein the first material and the second material are different. Multiple target objects are subjected to subtractive manufacturing to reduce the thickness of the target objects, thereby obtaining multiple dental products.

30. The method for manufacturing a plurality of dental products according to claim 29, characterized in that, The additive manufacturing of multiple target objects includes: simultaneously manufacturing multiple target objects, the multiple target objects being connected via multiple connectors.

31. The method for manufacturing a plurality of dental products according to claim 29, characterized in that, The additive manufacturing of multiple target objects includes additive manufacturing with a layer thickness of 20μm to 300μm.

32. The method for manufacturing a plurality of dental products according to claim 29, characterized in that, Also includes: Adjust the process parameters of additive manufacturing and subtractive manufacturing so that the total time of additive manufacturing is adapted to the total time of subtractive manufacturing.

33. A method for manufacturing a plurality of dental products according to any one of the preceding claims, characterized in that, The additive manufacturing process parameters include at least one of the following: layer thickness, number of target data models in a single plate, exposure time, and platform lifting time; The process parameters for subtractive manufacturing include at least one of the following: cutting path, number of cutting operations, and polishing time.

34. A system for manufacturing objects, characterized in that, include: A processor configured to increase the thickness of a data model of an object, the object comprising a first portion formed of at least a first material and a second portion formed of at least a second material, wherein the first material and the second material are different; Multi-material 3D printing equipment is configured to manufacture objects with increased thickness based on data models with increased thickness; The post-processing equipment is configured to remove the increased thickness portion of the object through subtractive manufacturing.

35. A method of manufacturing an object, said object comprising a first body and a second body connected to the first body, characterized in that, include: Obtain the initial data model of the object; Increase the thickness of the object's data model to obtain the target data model; Based on the target data model, a target object is obtained by additive manufacturing, wherein the first part of the target object includes a first material, and the second part of the target object includes a second material, wherein the first material and the second material are different. The target object is subjected to subtractive manufacturing to reduce its thickness, so that the size of the processed target object is basically the same as that of the initial data model.

36. A method of manufacturing a dental object, said dental object comprising a base and teeth, characterized in that, include: Obtain the initial data model of the dental object; Along at least one direction, the thickness of the initial data model of the dental object is increased by a predetermined value to obtain the target data model; Based on the target data model, the target object is manufactured as a single unit, wherein the target object includes a base portion and a tooth portion, the base portion includes a first material, and the tooth portion includes a second material different from the first material; The target object is processed to reduce its thickness by a predetermined value along at least one direction, thereby obtaining the dental object.

37. The method for manufacturing a dental object according to claim 36, characterized in that, The predetermined value is 30 μm to 3000 μm, preferably 50 μm to 2000 μm, preferably 100 μm to 1000 μm, and preferably 150 μm to 400 μm.

38. The method for manufacturing a dental object according to claim 36, characterized in that, The at least one direction includes at least one of the following: along the X-axis of the space where the data model is located, along the Y-axis of the space where the data model is located, along the Z-axis of the space where the data model is located, or along the normal of the contour of the data model.

39. The method for manufacturing a dental object according to claim 36, characterized in that, The integrated manufacturing target object includes: manufacturing the target object using a multi-material photopolymerization 3D printing device; Processing the target object includes: using machining equipment to cut the target object, and / or Grinding and polishing the target object.

40. A method for manufacturing a plurality of dental objects, characterized in that, include: Obtain initial data models for multiple dental objects; Increase the thickness of the initial data model for each dental object to obtain multiple target data models for multiple dental objects; Based on the multiple target data models, multiple target objects are additively manufactured, wherein each target object includes a base portion and a tooth portion, the base portion includes a first material, and the tooth portion includes a second material different from the first material; Multiple target objects are subjected to subtractive manufacturing to reduce the thickness of the target objects, thereby obtaining multiple dental objects.

41. The method for manufacturing a dental object according to claim 40, characterized in that, Also includes: Adjust the process parameters of additive manufacturing and subtractive manufacturing so that the total time of additive manufacturing is adapted to the total time of subtractive manufacturing.

42. The method of manufacturing a dental object according to any one of the preceding claims, characterized in that, The additive manufacturing process parameters include at least one of the following: layer thickness, number of target data models in a single plate, exposure time, and platform lifting time; or The process parameters for subtractive manufacturing include at least one of the following: cutting path, number of cutting operations, and polishing time.

43. A method for manufacturing dental products using multi-material partition printing, characterized in that, include: Obtain a digital 3D model of the target dental product; The three-dimensional model is divided into regions to generate at least two sub-region digital three-dimensional models with spatial coordinate relationships; Boolean operations are performed on the digital 3D models of each sub-region to form a partitioned structure suitable for multi-material printing; Using different materials that match the partition structure, dental products are obtained by integral 3D printing based on the digital 3D models of each sub-region.

44. The method according to claim 43, characterized in that, The target dental products include at least one of complete dentures, invisible dentures, crowns and bridges, full-mouth implant restorations, or jaw pads.

45. The method according to claim 43, characterized in that, The zoning includes partitioning based on at least one of the aesthetic features, mechanical properties, imaging capabilities, or soft and hard materials of the dental product.

46. ​​The method according to claim 43, characterized in that, The Boolean operations include at least one of Boolean addition, Boolean subtraction, or Boolean intersection.

47. The method according to claim 43, characterized in that, The target dental product is a complete denture, which includes a denture base. The three-dimensional model is divided into regions to generate at least two sub-regional digital three-dimensional models with spatial coordinate relationships, including: Obtain the digital 3D model of the Kitto; The lip and cheek side surface regions of the digital 3D model of the base are identified as aesthetic regions, and a texture layer sub-model with a predetermined thickness is generated based on preset texture and depth parameters. The texture layer sub-model is removed from the basement digital 3D model by Boolean subtraction to generate the main basement body sub-model; The texture layer sub-model and the main base body sub-model are two sub-regional digital 3D models with spatial coordinate relationships.

48. The method according to any one of the preceding claims, characterized in that, The method further includes: The tooth socket structure is stripped from the main base body sub-model and extended to form a root-transparent digital three-dimensional model with a gradient shape. The root projection digital 3D model and the upper tooth digital 3D model are merged using Boolean, and the merged model is subtracted from the main denture body sub-model using Boolean to update the main denture body sub-model.

49. The method according to claim 43, characterized in that, The target dental product is a complete denture, which includes the upper teeth portion. The three-dimensional model is divided into regions to generate at least two sub-region digital three-dimensional models with spatial coordinate relationships, including: Obtain a digital 3D model of the upper teeth; Identify the incisal region and cervical region of the upper tooth; A transparent layer sub-model with a finger-like projection shape is generated based on the cut-end region; A neck coloring layer sub-model with varying thickness is generated based on the aforementioned tooth neck region; By subtracting Boolean operations, the incisal transparent layer sub-model and the cervical tinted layer sub-model are subtracted sequentially from the upper tooth digital model to generate the intermediate tooth body sub-model; The incision transparent layer sub-model, the neck colored layer sub-model, and the intermediate tooth body sub-model are three sub-region digital 3D models with spatial coordinate relationships.

50. The method according to claim 43, characterized in that, The target dental product is an invisible denture, which includes upper teeth and a denture base. The three-dimensional model is divided into regions to generate at least two sub-region digital three-dimensional models with spatial coordinate relationships, including: Obtain digital 3D models of the upper teeth and denture base with coordinate relationships; Based on the preset tooth position range and tooth cervical margin line, the clasp and labial portion located on the base are identified and cut, and generated into an independent base sub-model including the clasp and labial portion; The digital model of the upper tooth, the model of the remaining denture base after cutting, and the model of the clasp and labial denture base are three sub-region digital three-dimensional models with spatial coordinate relationships.

51. The method according to claim 43, characterized in that, The target dental product is a crown and bridge. The three-dimensional model is divided into regions to generate at least two sub-region digital three-dimensional models with spatial coordinate relationships, including: Obtain the digital 3D model of the crown bridge; Identify the incision region and the labial / buccal neck region of the crown bridge; A transparent layer sub-model with a finger-like projection shape is generated based on the cut-end region; A neck coloring layer sub-model with varying thickness is generated based on the aforementioned lip, cheek, and neck region; By subtracting the incisal transparent layer submodel and the cervical tinted layer submodel from the digital model of the target dental product in sequence through Boolean sub-operation, a tooth body submodel is generated. The incisional transparent layer sub-model, the cervical colored layer sub-model, and the tooth body sub-model are three sub-region digital 3D models with spatial coordinate relationships.

52. The method according to claim 43, characterized in that, The target dental product is a full-mouth implant restoration. The three-dimensional model is divided into regions to generate at least two sub-region digital three-dimensional models with spatial coordinate relationships, including: Obtain a digital 3D model of the full-mouth implant restoration; Identify the interface area on the repair body, and expand outward by a preset thickness based on the interface area to generate an independent interface sub-model; The interface sub-model is removed from the digital model of the restoration by Boolean subtraction to generate the main body sub-model of the restoration. The interface sub-model is associated with materials that have radiopaque properties, while the prosthesis body sub-model is associated with non-radiopaque materials.

53. The method according to claim 43, characterized in that, The target dental product is a jaw pad. The three-dimensional model is divided into regions to generate at least two sub-region digital three-dimensional models with spatial coordinate relationships, including: Obtain a digital 3D model of the jaw pad; Based on the tooth segmentation results, the tooth surface regions in contact with the teeth are identified, and a soft inner lining sub-model with a preset thickness is generated based on the tooth surface regions. The soft inner lining sub-model is removed from the jaw pad digital model by Boolean subtraction to generate the hard outer shell sub-model; The soft inner lining sub-model is associated with soft materials, and the hard outer shell sub-model is associated with hard materials.

Images