Appliance manufacturing method using a compression molding mold, method for manufacturing an appliance, and method for manufacturing an appliance

Abstract

The application provides a kind of appliance manufacturing using compression moulding model, including dental arch prototype and the accessory model on dental arch prototype, the accessory model includes connecting part and accessory part, the gap is formed between the accessory part and the dental arch prototype, the connecting part is located in the gap for connecting the accessory part and the dental arch prototype, when the force greater than predetermined value is applied to the connecting part, the connecting part breaks, thereby realizing the separation of the accessory part and the dental arch prototype. By the setting of the breakable connecting part in the compression moulding model, the difficulty of appliance demoulding can be reduced, and the deformation or cracking of appliance in the demoulding process can be avoided. Meanwhile, the application also provides a kind of appliance manufacturing using compression moulding model and a kind of appliance manufacturing method.

Description

Technical Field

[0001] This invention relates to the field of dental orthodontics, and in particular to a pressure mold model for making orthodontic appliances and its manufacturing method, as well as a method for making orthodontic appliances. Background Technology

[0002] As a type of orthodontic appliance, clear aligners offer advantages over traditional bracket fixed aligners, including complete invisibility during the orthodontic process, aesthetic appeal, comfort, and ease of oral hygiene. They have gradually replaced traditional bracket fixed aligners and become the preferred choice for patients undergoing orthodontic treatment.

[0003] Currently, the manufacturing method for clear aligners is based on creating a physical dental model that simulates the state of teeth using a digital dental model. The clear aligner is then fabricated using processes such as molding, cutting, and demolding on this model. However, existing clear aligners often incorporate attachments to enhance the corrective force in cases of severe malocclusion. To generate an aligner including attachments, corresponding attachment prototypes need to be added to the dental model to create a molding model. The addition of these attachment models leads to significant changes in the curvature of the molding model, making demolding difficult during production. During demolding, especially when separating the aligner from the attachment prototypes on the molding model, problems such as diaphragm tearing and deformation are common. Furthermore, to confirm whether the aligner has deformed during demolding, it is usually necessary to test the demolded aligner on the dental model. Since the demolded molding model still contains attachment prototypes, this testing is difficult, requiring the printing of additional dental models for aligner testing, increasing production costs. Summary of the Invention

[0004] The technical problem solved by this invention is to overcome the defects of the existing technology and provide a molding model for orthodontic appliance fabrication and its fabrication method, as well as a method for fabricating orthodontic appliances. This invention can solve the technical problems of difficult demolding during the fabrication of orthodontic appliances including accessories, the need to additionally print dental models for orthodontic appliance fit testing, and high costs.

[0005] The technical solution of this invention is as follows:

[0006] A molding model for orthodontic appliance fabrication includes a dental prototype and an attachment model on the dental prototype. The attachment model comprises a connecting portion and an attachment portion, with a gap between the attachment portion and the dental prototype. The connecting portion, located within the gap, connects the attachment portion to the dental prototype. When a force greater than a predetermined value is applied to the connecting portion, the connecting portion breaks, thereby separating the attachment portion from the dental prototype. By using a breakable connecting portion, the connecting portion can break during appliance demolding, allowing the appliance, along with the attachment portion, to be separated from the dental prototype first. After separation, the attachment portion is removed from the appliance, completing the demolding process. This eliminates the need to directly separate the appliance from the attachment model of the molding model, reducing demolding difficulty and avoiding problems such as diaphragm tearing or deformation during demolding. Furthermore, during demolding, the attachment portion also separates from the dental prototype, allowing the resulting dental prototype to be used for appliance inspection, thus reducing production costs.

[0007] Furthermore, the connecting part includes multiple support pillars, which are connected between the attachment part and the dental prototype. When a force greater than a predetermined value is applied to the multiple support pillars, the multiple support pillars break, thereby achieving the separation of the attachment part from the dental prototype.

[0008] Furthermore, at least some of the plurality of pillars are hollow pillars.

[0009] Furthermore, holes are formed on the outer wall of the hollow support column.

[0010] Furthermore, the cross-sectional area of ​​the plurality of pillars first decreases and then increases from the end where the pillar is connected to the attachment part to the other end where it is connected to the dental prototype.

[0011] Furthermore, the plurality of supports are cylindrical, and the diameter of the plurality of supports is 0.4-1mm.

[0012] Furthermore, it also includes a smooth transition portion, wherein the attachment portion includes a first separation surface, the dental prototype includes a second separation surface, the gap is formed between the first separation surface and the second separation surface, the smooth transition portion extends from the edge of the first separation surface in the gap to the edge of the second separation surface to make the attachment portion and the dental prototype smoothly transition connected, and the smooth transition portion is removed when a force greater than a predetermined value is applied to the smooth transition portion.

[0013] Furthermore, the smooth transition portion is formed by wax filling.

[0014] Furthermore, the connecting portion includes at least one connecting layer located in the gap for connecting the attachment portion and the dental prototype. When a force greater than a predetermined value is applied to the connecting layer, the connecting layer breaks, thereby achieving separation of the attachment portion and the dental prototype.

[0015] Furthermore, the connecting portion includes multiple connecting layers, and at least some of the connecting layers are interconnected.

[0016] Furthermore, the connecting layer includes a connecting layer that is connected end to end, the attachment part includes a first separation surface, the dental prototype includes a second separation surface, the gap is formed between the first separation surface and the second separation surface, and the connecting layer that is connected end to end extends from the edge of the first separation surface to the edge of the second separation surface so that the attachment part and the dental prototype are smoothly connected.

[0017] Furthermore, the connecting portion includes a plurality of pillars connected between the attachment portion and the dental arch prototype, and the connecting layer includes at least one internal connecting layer connected between two of the pillars. When a force greater than a predetermined value is applied to the internal connecting layer and the plurality of pillars, the internal connecting layer and the pillars break.

[0018] Furthermore, the connecting layer has holes.

[0019] Furthermore, the thickness of the connecting layer is 0.2-0.3 mm.

[0020] Furthermore, the height of the connecting portion is 0.5-1mm.

[0021] Furthermore, the attachment model is used to generate the protrusions on the posterior occlusal surface of the orthodontic appliance that extend towards the opposing direction, the maxillary arch, and the protrusions on the buccal or lingual surfaces of the posterior occlusal surface that extend towards the opposing direction.

[0022] Furthermore, the attachment model is used to generate the maxillary arch on the orthodontic appliance, and the connecting part is located 1-2 mm below the gingival line of the dental prototype.

[0023] Furthermore, the dental prototype and the accessory model are integrally formed.

[0024] A method for fabricating a molding die for the above-mentioned orthodontic appliance includes the following steps:

[0025] A three-dimensional digital compression molded prototype was established, including a digital dental arch prototype and digital attachment prototypes on the digital dental arch prototype.

[0026] The digital attachment portion is formed by cutting the side where the digital attachment prototype connects to the digital dental prototype.

[0027] A digital connecting part is added to the space formed by cutting between the digital attachment part and the digital dental prototype to connect the digital attachment part and the digital dental prototype, thereby forming a three-dimensional digital compression model;

[0028] The molded model for the orthodontic appliance is prepared using rapid prototyping technology based on the three-dimensional digital molded model.

[0029] Furthermore, the rapid prototyping technology is any one of 3D printing technology, stereolithography, fused deposition modeling, and selective laser sintering.

[0030] Furthermore, after preparing the molded model for the orthodontic appliance using rapid prototyping technology, the attachment part includes a first separation surface, the dental prototype includes a second separation surface, and the gap is formed between the first separation surface and the second separation surface. A filler is used to fill the gap from the edge of the first separation surface to the edge of the second separation surface to form a smooth transition part so that the attachment part and the dental prototype are smoothly connected. When a force greater than a predetermined value is applied to the smooth transition part, the smooth transition part is removed.

[0031] Furthermore, the filler is wax.

[0032] A method for manufacturing an orthodontic appliance includes the following steps:

[0033] A diaphragm is hot-pressed onto a molding model to form a molding assembly including the orthodontic appliance to be cut and the molding model. The molding model is the molding model for making the orthodontic appliance described above or the molding model is prepared using the manufacturing method of the molding model for making the orthodontic appliance described above.

[0034] The pressure film assembly is cut to obtain a pressure film assembly including the cut orthodontic appliance and the pressure film model;

[0035] The cut orthodontic appliance is demolded, and during demolding, the connecting part is broken to separate the cut orthodontic appliance from the original dental prototype.

[0036] The accessory portion is then separated from the cut orthodontic appliance to obtain the orthodontic appliance.

[0037] Furthermore, the procedure also includes the following steps: determining whether the orthodontic appliance is qualified: the orthodontic appliance is worn on the dental prototype, and the orthodontic appliance is qualified by judging whether it fits the dental prototype. If the orthodontic appliance fits the dental prototype, it is considered qualified; if the orthodontic appliance does not fit the dental prototype, it is considered unqualified, and the orthodontic appliance is remade.

[0038] The present invention provides a molding model for fabricating orthodontic appliances, a fabrication method thereof, and a method for fabricating orthodontic appliances, which have at least the following advantages compared with the prior art:

[0039] 1. By designing a breakable connecting part, the difficulty of demolding the orthodontic appliance can be reduced, avoiding problems such as diaphragm tearing or deformation during demolding; at the same time, the dental model obtained after demolding can be used for the inspection of the orthodontic appliance, saving production costs.

[0040] 2. By setting the cross-sectional area of ​​the support column to first decrease and then increase from the end where the support column is connected to the attachment part to the other end where it is connected to the dental prototype, it is easier to apply the force that causes the support column to break, thus improving work efficiency.

[0041] 3. By setting a smooth transition section, dents can be avoided during the molding process. On the one hand, this reduces the difficulty of separating the attachment part from the orthodontic appliance, and on the other hand, it ensures that the shape of the attachment on the manufactured orthodontic appliance is consistent with the preset attachment shape.

[0042] 4. By setting holes in the outer wall of the hollow support or the connecting layer, the strength of the hollow support or the connecting layer can be reduced, making it easier for it to break. Attached Figure Description

[0043] Figures 1A-1D Schematic diagrams of different embodiments of the pressure film model used in the fabrication of the orthodontic appliance of the present invention;

[0044] Figure 2A Different embodiments of the pressure mold model for manufacturing the orthodontic appliance of the present invention Figure 1A A magnified view of a section at point A in the middle;

[0045] Figure 2B-2C A schematic diagram of the accessory model in different embodiments of the pressure film model for manufacturing the orthodontic appliance of the present invention;

[0046] Figures 3A-3H Schematic diagrams of different embodiments of the support pillar in the pressure film model for manufacturing the orthodontic appliance of the present invention;

[0047] Figures 4A-4E Different embodiments of the connecting part in the pressure film model for manufacturing the orthodontic appliance of the present invention are shown below. Figure 2C A cross-sectional view along the direction shown in B-B';

[0048] Figure 5 A flowchart illustrating one embodiment of the method for manufacturing a pressure mold model for the orthodontic appliance of the present invention;

[0049] Figure 6A and Figure 6B A schematic diagram of one embodiment of the pressure film model and pressure film prototype used in the fabrication of the orthodontic appliance of the present invention;

[0050] Figure 7 A flowchart illustrating one embodiment of the method for manufacturing the orthodontic appliance of the present invention;

[0051] Figure 8 This is a schematic diagram of one embodiment of the dental prototype after demolding according to the present invention. Detailed Implementation

[0052] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the specific implementation methods of the present invention will be described below with reference to the accompanying drawings. Obviously, the drawings described below are merely some embodiments of the present invention. For those skilled in the art, other drawings and other implementation methods can be obtained based on these drawings without any creative effort.

[0053] To simplify the drawings, only the parts relevant to the invention are schematically shown in each figure, and they do not represent the actual structure of the product. Furthermore, for ease of understanding, some figures may only schematically depict one or more components with the same structure or function, or only label one or more of them; this should not be construed as a limitation on the number. In the description of the embodiments of the invention, it should be noted that the terms "upper," "lower," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the drawings, or the orientation or positional relationship commonly used when the product is in use, are only for the purpose of describing the invention and do not indicate or imply that the device or structure referred to must have a specific orientation, or be constructed and operated in a specific orientation; therefore, they should not be construed as limitations on the invention.

[0054] The specific implementation method will be further explained below:

[0055] See Figure 1A and Figure 2AThe present invention provides a pressure mold model 1 for a biting tool, including a dental prototype 2 and an attachment model 3 on the dental prototype 2. The attachment model 3 includes a connecting part 31 and an attachment part 32. A gap 4 is formed between the attachment part 32 and the dental prototype 2. The connecting part 31 is located in the gap 4 and is used to connect the attachment part 32 and the dental prototype 2. When a force greater than a predetermined value is applied to the connecting part 31, the connecting part 31 breaks, thereby realizing the separation of the attachment part 32 from the dental prototype 2. By incorporating the breakable connecting part 31, the connecting part 31 can break during the demolding process of the orthodontic appliance. This allows the appliance, along with the attachment part 32, to be separated from the dental prototype 2 first. After the appliance is separated from the dental prototype 2, the attachment part 32 can be removed from the appliance, thus completing the demolding process. This eliminates the need to directly separate the appliance from the attachment model 3 of the mold 1, reducing the difficulty of demolding and preventing the diaphragm from being pried open or deformed during the demolding process. In addition, during the demolding process, the attachment part 32 also separates from the dental prototype 2. The resulting dental prototype 2 can be used for the inspection of the appliance, thereby reducing production costs.

[0056] In some implementations, such as Figure 2A As shown, the connecting part 31 includes multiple support pillars 311, which are used to connect the attachment part 32 and the dental prototype 2. When a force greater than a predetermined value is applied to the multiple support pillars 311, the multiple support pillars 311 break, thereby achieving the separation of the attachment part 32 and the dental prototype 2. Figures 3A-3E As shown, the shape of the multiple support pillars 311 can be a cylinder or a polygonal prism such as a triangular prism, a square prism, a hexagonal prism, or other polyhedrons of arbitrary shape, which will not be listed here. They can satisfy the requirement of stably connecting the attachment part 32 and the dental prototype 2. The support pillars 311 will not break during the molding process, but when a force greater than a predetermined value is applied to the support pillars 311, the support pillars 311 can break.

[0057] In some implementations, such as Figure 3C-3D As shown, at least some of the multiple support columns 311 are hollow. The hollow structure helps save materials. In some embodiments, all of the multiple support columns 311 can be made hollow. In some implementations, a first hole 312 is provided on the outer wall of the hollow support column to reduce its strength and facilitate breakage, such as... Figure 3E-3F As shown. The shape, size, and number of the first hole 312 can be set as needed, and there are no restrictions here.

[0058] In some embodiments, the cross-sectional area of ​​the support 311 first decreases and then increases from the end where the support 311 connects to the attachment portion 32 to the other end where it connects to the dental prototype 3. See [reference needed]. Figure 3G-3HThe tool used to break the support 311, such as a prying tool, typically has a trapezoidal working end. During the process of breaking the support 311, the thickness of the working end of the tool gradually increases from the side close to the support to the side away from the support. Through the above arrangement, the side of the support is curved, which can make the shape of the side of the support roughly match the shape of the outer surface of the working end of the tool. This can provide a guiding effect for the tool to apply force, making it easier to apply force.

[0059] In some embodiments, the multiple supports 311 are cylindrical, and the diameter d of the multiple supports 311 is 0.4-1 mm. In practical applications, the commonly used method is to create the molding model 1 using 3D printing. After the molding model 1 is created, it needs to be cleaned to remove any remaining excess 3D printing liquid material. Since cleaning occurs before the molding model 1 is fully cured, to avoid washing away the supports 311 during cleaning, the contact area between the supports 311 and the attachment part 32 and the dental model 2 cannot be too small, i.e., the diameter d cannot be too small. At the same time, a diameter d that is too small will also make the supports 311 prone to breakage during molding. Therefore, the minimum value of the diameter d of the supports 311 is set to 0.4 mm. On the other hand, if the diameter d of the supports 311 is too large, it will be difficult for the supports 311 to break. Therefore, the maximum value of the diameter d of the supports 311 is set to 1 mm. When the supports 311 are of other shapes, the same optimization design can be made based on the above considerations, which will not be listed here.

[0060] In some implementations, such as Figure 2B As shown, it also includes a smooth transition portion 5, an attachment portion 32 including a first separation surface 321, and the tooth prototype 2 including a second separation surface 21. A transition surface 321 and a second separation surface are formed between them. Figure 2A In the gap 4, a smooth transition portion 5 extends from the edge of the first separation surface 321 to the edge of the second separation surface 21 to smoothly connect the attachment portion 32 and the dental prototype 2. When a force greater than a predetermined value is applied to the smooth transition portion 5, the smooth transition portion 5 is removed. In some specific embodiments, the smooth transition portion 5 is formed by wax filling. The smooth transition portion 5 avoids the formation of indentations on the orthodontic appliance during the molding process. On the one hand, it avoids the increased difficulty in separating the attachment portion 32 from the orthodontic appliance due to the presence of indentations. On the other hand, it ensures that the shape of the attachment on the manufactured orthodontic appliance is consistent with the preset attachment shape.

[0061] In some implementations, such as Figure 2C As shown, the connecting portion 31 includes at least one connecting layer 313, and the connecting layer 313 is located as shown in the figure. Figure 2A The gap 4 is used to connect the attachment part 32 and the dental prototype 2. When a force greater than a predetermined value is applied to the connecting layer 313, the connecting layer 313 breaks, thereby achieving the separation of the attachment part 32 and the dental prototype 2. Figures 4A-4B As shown, the number of connecting layers 313 can be one, or multiple layers can be provided to enhance compressive strength during the lamination process; the connecting layers 313 can be connecting layers 3131 connected end to end, or connecting layers 3132 not connected end to end; different connecting layers 313 can be unconnected, or at least some of the connecting layers 313 can be interconnected to enhance compressive strength during the lamination process, such as... Figure 4C As shown. In some implementations, such as Figure 4D As shown, the connecting part 31 may include both a connecting layer 313 and a support column 311.

[0062] In some embodiments, the connecting layer 313 includes a connecting layer 3131 connected end to end, the attachment portion 32 includes a first separating surface 321, the jaw prototype 2 includes a second separating surface 21, and a connection is formed between the first separating surface 321 and the second separating surface 21. Figure 2A In the gap 4, a connecting layer 3131 extends from the edge of the first separation surface 321 to the edge of the second separation surface 21, allowing for a smooth transition between the attachment part and the dental prototype. The connecting layer 3131 prevents indentations during molding, reducing the difficulty of separating the attachment part from the appliance during demolding and ensuring that the shape of the attachment on the finished appliance matches the pre-designed attachment shape. In some embodiments, the connecting layer 3131 may also be located in other positions within the gap 4.

[0063] In some embodiments, the connecting portion 31 includes a plurality of pillars 311 and a connecting layer 313. The plurality of pillars 311 connect the attachment portion 32 and the dental prototype 2. The connecting layer 313 includes at least one inner connecting layer 3133, which connects two pillars 311, such as... Figure 4D As shown, when a force greater than a predetermined value is applied to the internal connecting layer 3133 and the plurality of pillars 311, the internal connecting layer 3133 and the plurality of pillars 311 break.

[0064] In some embodiments, a second hole 314 is provided on the connecting layer 313. The second hole 314 can reduce the strength of the connecting layer 313, making it easier for it to break. For example... Figure 4E As shown, when the connecting layer 3131, which extends from the edge of the first separating surface 321 to the edge of the second separating surface 21 to connect the attachment portion 32 and the dental prototype 2 in a smooth transition, is included, the second hole 314 thereon also helps to form a notch during demolding, thereby facilitating the separation of the attachment portion 32 from the orthodontic appliance.

[0065] In some embodiments, the thickness t of the connecting layer 313 is 0.2-0.3 mm. This thickness is set to a minimum of 0.2 mm to avoid breakage of the connecting layer 313 during the molding process, and to a maximum of 0.3 mm to avoid difficulty in preventing breakage of the connecting layer 313 during the demolding process.

[0066] In some embodiments, the height h of the connecting portion 31 is 0.5-1 mm. To achieve the breakability of the connecting portion 31, its cross-sectional area is relatively small. When the diaphragm is formed onto the molding model using a hot-pressing process, a certain pressure is applied to the diaphragm. If the height of the connecting portion 31 is too high, it may break under the aforementioned pressure during the molding process, causing problems in the molding process. This would require remaking the molding model and re-molding, affecting production efficiency. Therefore, the maximum height of the connecting portion 31 is set to 1 mm. Furthermore, during the demolding process, a mold-prying tool is typically used to break the support pillar while demolding. To allow the mold-prying tool to extend into the gap 4 between the attachment portion 32 and the dental model 2 and act on the connecting portion 31, the height of the connecting portion 31 should be greater than the thickness of the mold-prying end of the mold-prying tool. Typically, the minimum thickness of the mold-prying end of the mold-prying tool is approximately 0.3 mm. Considering the manufacturing error of the mold-prying tool, the minimum height of the connecting portion 31 is set to 0.5 mm. The heights of the connecting portions 31 can be the same or different. In some embodiments, the height of the connecting portions 31 remains the same at different positions. This facilitates the fabrication of the molding model and ensures that the force applied to the connecting portions 31 during the molding process is more uniform, which helps to prevent the connecting portions 31 from breaking during the molding process.

[0067] In some implementations, the attachment model 3 is used to generate protrusions on the posterior occlusal surface of the appliance that extend towards the opposing jaw, the maxillary arch, and protrusions on the buccal or lingual surfaces of the posterior occlusal surface that extend towards the opposing jaw, such as... Figure 1A-1D As shown. In cases where additional attachments need to be created on the orthodontic appliance, and this also leads to difficulties in demolding, a method of setting up a breakable connection can be adopted.

[0068] In some implementations, such as Figure 1BAs shown, attachment model 3 is used to generate the maxillary arch on the orthodontic appliance, and the connecting part 31 is located 1-2 mm below the gingival line 22 of the dental prototype 2. Since the setting of the connecting part 31 may cause indentations on the appliance to be cut, in order to reduce the impact of indentations on the shape of the appliance after cutting, the appliance to be cut is cut along the gingival line to obtain the cut appliance. Setting the connecting part 31 at least 1 mm below the gingival line can remove the part with indentations during the cutting process. In addition, in order to solve the problem of difficult demolding, considering the position of the attachment model corresponding to the maxillary arch, the farthest distance of the connecting part below the gingival line is set to 2 mm.

[0069] In some implementations, the dental prototype 2 and the attachment model 3 are integrally formed. To achieve integral forming, the molding model 1 is usually made based on the digital molding model through a rapid prototyping method. The positional relationship of the dental prototype 2, attachment part 32, and connecting part 31 on the molding model 1 is consistent with the design in the digital molding model. Compared with the dental prototype 2 and attachment model 3 being made separately and then connected into a whole, this can effectively improve the manufacturing accuracy and make the manufactured orthodontic appliance more in line with the design requirements.

[0070] The present invention also provides a method for manufacturing the pressure mold 1 for making the above-mentioned orthodontic appliance, in some embodiments, such as Figure 5 As shown, the manufacturing method includes the following steps:

[0071] S101: Establish a three-dimensional digital compression molded prototype, including a digital dental arch prototype and digital attachment prototypes on the digital dental arch prototype;

[0072] S102: Cut the side where the digital attachment prototype connects to the digital dental prototype to form the digital attachment part;

[0073] S103: A digital connector is added to the space formed by cutting between the digital attachment part and the digital dental prototype to connect the digital attachment part and the digital dental prototype, thereby forming a three-dimensional digital compression model.

[0074] S104: Based on the three-dimensional digital compression molding model, a compression molding model 1 for orthodontic device fabrication was prepared using rapid prototyping technology.

[0075] Based on the above manufacturing method, the obtained three-dimensional digital lamination model, compared with the three-dimensional digital lamination prototype, does not change the positional relationship between the digital attachment part and the digital dental prototype. It only replaces the corresponding parts of the digital attachment part and the digital dental prototype with connecting parts. That is, the overall outer contour of the obtained three-dimensional digital lamination model is basically consistent with that of the three-dimensional digital lamination prototype. Therefore, the outer contour of the lamination model 1 prepared from the three-dimensional digital lamination model is also basically consistent with that of the lamination prototype 10 prepared from the three-dimensional digital lamination prototype. Figures 6A-6B As shown, the overall shape of the orthodontic appliance made according to the molding model 1 and the molding prototype 10 is basically the same. That is, the molding model obtained by the above manufacturing method can effectively reduce the difficulty of demolding the orthodontic appliance and improve production efficiency without changing the shape of the orthodontic appliance.

[0076] In some embodiments, the rapid prototyping technology is any one of 3D printing, stereolithography, fused deposition modeling, and selective laser sintering.

[0077] In some embodiments, after the molded model 1 for the orthodontic appliance is prepared using rapid prototyping technology, the attachment part 32 includes a first separation surface 321, and the dental prototype 2 includes a second separation surface 21. A gap 4 is formed between the first separation surface 321 and the second separation surface 21. A filler is used to fill the gap 4 from the edge of the first separation surface 321 to the edge of the second separation surface 21 to form a smooth transition part 5, so that the attachment part 32 and the dental prototype 2 are smoothly connected. When a force greater than a predetermined value is applied to the smooth transition part 5, the smooth transition part 5 is removed. The smooth transition part 5 avoids the formation of dents on the orthodontic appliance during the molding process. On the one hand, it avoids the increased difficulty in separating the attachment part 32 from the orthodontic appliance due to the presence of dents; on the other hand, it ensures that the shape of the attachment on the manufactured orthodontic appliance is consistent with the preset attachment shape. In some embodiments, the filler is wax.

[0078] The present invention also provides a method for manufacturing an orthodontic appliance, in some embodiments, such as Figure 7 As shown, it includes the following steps:

[0079] S111: The diaphragm is hot-pressed onto the pressing mold 1 to form a pressing assembly including the orthodontic appliance to be cut and the pressing mold; the pressing mold 1 is the pressing mold 1 for making the orthodontic appliance described above or the pressing mold 1 is prepared by the above-described method for making the pressing mold for making the orthodontic appliance.

[0080] S112: Cut the pressure membrane assembly to obtain a pressure membrane assembly including the cut orthodontic appliance and pressure membrane model 1;

[0081] S113: Demold the cut orthodontic appliance. During demolding, break the connecting part 31 to separate the cut orthodontic appliance from the dental prototype 2.

[0082] S114: Then separate the accessory part 32 from the cut orthodontic appliance to obtain the orthodontic appliance.

[0083] In some embodiments, the manufacturing method further includes the step of: determining whether the orthodontic appliance is qualified: the orthodontic appliance is worn on the dental prototype 2, and the orthodontic appliance is qualified by judging whether it fits the dental prototype 2. If the orthodontic appliance fits the dental prototype 2, it is judged to be qualified; if the orthodontic appliance does not fit the dental prototype, it is judged to be unqualified, and the orthodontic appliance is remade.

[0084] In the manufacturing method of this invention, see [reference needed]. Figure 8 The demolded dental prototype 2 can also be used to determine whether the orthodontic appliance is qualified, eliminating the need to separately manufacture dental prototypes for testing the orthodontic appliance's qualification, thus effectively reducing production costs.

[0085] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. These embodiments can be freely combined as needed without causing contradictions. However, the present invention is not limited to the above embodiments; the above descriptions are merely preferred embodiments. Even if various changes are made to the present invention, if these changes fall within the scope of the claims of the present invention and their equivalents, they still fall within the protection scope of the present invention.

Claims

1. A press-film model for making an appliance, comprising a dental arch prototype and an attachment model on the dental arch prototype, characterized in that, The accessory model comprises a connecting part and an accessory part, the accessory part is spaced apart from the dental arch prototype, the connecting part is located in the gap for connecting the accessory part and the dental arch prototype, when the force greater than the predetermined value is applied to the connecting part, the connecting part is broken, thereby achieving the separation of the accessory part and the dental arch prototype, the connecting part comprises a plurality of struts, the plurality of struts are connected between the accessory part and the dental arch prototype, when the force greater than the predetermined value is applied to the plurality of struts, the plurality of struts are broken, thereby achieving the separation of the accessory part and the dental arch prototype, at least part of the plurality of struts are hollow struts; the height of the connecting part is 0.5-1mm.

2. The press-film model for making an appliance according to claim 1, wherein, The outer wall of the hollow strut is provided with a hole.

3. The appliance fabrication using a compression mold model according to claim 1, wherein, The cross-sectional area of the plurality of struts decreases first and then increases from one end connected with the accessory part to the other end connected with the dental arch prototype.

4. The appliance fabrication using a press-film model according to claim 1, wherein, The plurality of struts are cylindrical, and the diameter of the plurality of struts is 0.4-1mm.

5. The appliance fabricated with a press-film model according to any one of claims 1-4, wherein, Further comprising a smooth transition part, the accessory part comprises a first separation surface, the dental arch prototype comprises a second separation surface, the gap is formed between the first separation surface and the second separation surface, the smooth transition part extends from the edge of the first separation surface to the edge of the second separation surface in the gap to smoothly connect the accessory part and the dental arch prototype, when the force greater than the predetermined value is applied to the smooth transition part, the smooth transition part is removed.

6. The appliance fabricated using the compression mold model of claim 5, wherein, The smooth transition part is formed by filling wax.

7. The appliance fabricated using the compression mold model of claim 1, wherein, The connecting part comprises at least one connecting layer, the connecting layer is located in the gap for connecting the accessory part and the dental arch prototype, when the force greater than the predetermined value is applied to the connecting layer, the connecting layer is broken, thereby achieving the separation of the accessory part and the dental arch prototype.

8. The appliance fabricated using the compression mold model of claim 7, wherein, The connecting part comprises a plurality of connecting layers, at least part of the connecting layers are connected with each other.

9. The appliance fabricated using the compression mold model of claim 7, wherein, The connecting layer comprises a first and a last connecting layer, the accessory part comprises a first separation surface, the dental arch prototype comprises a second separation surface, the gap is formed between the first separation surface and the second separation surface, the first and the last connecting layers extend from the edge of the first separation surface to the edge of the second separation surface to smoothly connect the accessory part and the dental arch prototype.

10. The appliance fabricated using the compression mold model of claim 7, wherein, The connecting part comprises a plurality of struts, the plurality of struts are connected between the accessory part and the dental arch prototype, the connecting layer comprises at least one internal connecting layer, the internal connecting layer is connected between two struts, when the force greater than the predetermined value is applied to the internal connecting layer and the plurality of struts, the internal connecting layer and the plurality of struts are broken.

11. The appliance fabricated using the compression mold model of claim 7, wherein, The connecting layer is provided with a hole.

12. The appliance fabricated using the compression mold model of claim 7, wherein, The thickness of the connecting layer is 0.2-0.3mm.

13. The process for making an appliance according to claim 1 wherein, The accessory model is used to generate a protrusion on the posterior region of the appliance, the protrusion extending towards the opposite jaw, a palatal arch, a protrusion on the buccal side or lingual side of the posterior region of the appliance.

14. The appliance fabricated using the compression mold model of claim 13, wherein, The accessory model is used to generate a palatal arch on the appliance, and the connecting part is located 1-2mm below the gum line of the dental arch prototype.

15. The use of a pressure forming mold to fabricate an appliance according to claim 1, wherein, The dental arch prototype and the attachment model are integrally formed.

16. A method of fabricating a pressure forming mold for fabricating an appliance as claimed in any one of claims 1-4, 7-15, characterized in that, The method comprises the following steps: a three-dimensional digital impression model is established, which comprises a digitalized dental arch prototype and a digitalized attachment prototype on the digitalized dental arch prototype; a digitalized attachment part is formed by cutting the side of the digitalized attachment prototype connected to the digitalized dental arch prototype; a digitalized connecting part is added in the space formed by cutting between the digitalized attachment part and the digitalized dental arch prototype to connect the digitalized attachment part and the digitalized dental arch prototype, thereby forming a three-dimensional digitalized impression model; the impression model for making the appliance is prepared based on the three-dimensional digitalized impression model by using a rapid prototyping technology.

17. The method of claim 16, wherein the method further comprises: The rapid prototyping technology is any one of 3D printing technology, stereolithography process, fused deposition modeling, and selective laser sintering.

18. The method of claim 16, wherein the method further comprises: After the impression model for making the appliance is prepared by using the rapid prototyping technology, the attachment part comprises a first separation surface, the dental arch prototype comprises a second separation surface, the first separation surface and the second separation surface form the gap therebetween, and a filler is used to fill the gap from the edge of the first separation surface to the edge of the second separation surface to form a smooth transition part to smoothly connect the attachment part and the dental arch prototype, and when a force greater than a predetermined value is applied to the smooth transition part, the smooth transition part is removed.

19. The method of claim 18, wherein the method further comprises: The filler is wax.

20. A method of fabricating an appliance, comprising: The method comprises the following steps: a film is hot-pressed on the impression model to form an impression assembly comprising a to-be-cut appliance and an impression model, the impression model is the impression model for making the appliance of any one of claims 1-15 or is prepared by using the method for making the impression model for making the appliance of any one of claims 16-19; the impression assembly is cut to obtain an impression assembly comprising a cut appliance and the impression model; the cut appliance is demolded, and when demolding, the connecting part is broken to realize the separation of the cut appliance from the dental arch prototype; the attachment part is separated from the cut appliance to obtain the appliance.

21. The method of fabricating an appliance of claim 20, wherein, The method further comprises the following steps: whether the appliance is qualified is determined, the appliance is worn on the dental arch prototype, whether the appliance is qualified is determined by determining whether the appliance and the dental arch prototype are fitted, if the appliance and the dental arch prototype are fitted, it is determined that the appliance is qualified; if the appliance and the dental arch prototype are not fitted, it is determined that the appliance is unqualified, and the production of the appliance is re-performed.

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