Design method, forming method, storage medium and system of torsion accessory

Abstract

The application discloses a design method, a forming method, a storage medium and a system of a torsion attachment, and the design method comprises the following steps: generating an action surface at a reference plane according to a design quantity; selecting a point on the upper edge of the action surface and with the largest vertical distance from the reference plane as a second end point; generating a first end point at the reference plane according to the stress direction of the action surface, and the direction of the second end point towards the first end point matches the stress direction; extending the point on the upper edge of the action surface and converging to the first end point, thereby generating a guide surface connecting the action surface and the reference plane. The stress direction of the action surface of the torsion attachment obtained by the design method of the application matches the direction of the second end point towards the first end point, and when a dental orthodontic appliance is worn, the unnecessary contact and stress between the accommodating cavity of the dental orthodontic appliance matched with the torsion attachment and the torsion attachment can be reduced, thereby the precise stress of the tooth to be treated can be realized.

Description

Technical Field

[0001] This invention relates to the field of orthodontic technology, and in particular to a design method, molding method, storage medium, and system for a torsion attachment. Background Technology

[0002] Due to their aesthetic appeal, convenience, and ease of cleaning, dental orthodontic appliances made of polymer materials are becoming increasingly popular. Typically, orthodontic treatment using appliances involves a series of sequential appliances, each with a cavity geometry that roughly matches the desired tooth layout for the corresponding treatment step.

[0003] In many cases, relying solely on the orthodontic appliance itself is insufficient to guarantee the application of appropriate orthodontic forces to the teeth. In such cases, it is often necessary to bond attachments of a certain shape to the tooth surface to enhance the effect and form a corresponding cavity on the orthodontic appliance to accommodate the attachment. Through the squeezing and friction between the cavity and the attachment, an auxiliary force is applied to the tooth, making the total orthodontic force applied to the tooth closer to the desired force.

[0004] Currently, there is no mature method to guide the design of orthodontic attachments. The design and addition of attachments mainly rely on the experience of clinicians or technicians. Conventionally designed attachments are prone to causing large local friction between the orthodontic appliance and the attachment. This phenomenon will cause wear and tear on the orthodontic appliance and attachment, thus affecting the orthodontic effect. Summary of the Invention

[0005] The purpose of this invention is to provide a design method, molding method, storage medium, and system for a torsion attachment, which can reduce unnecessary contact and stress between the receiving cavity of the dental orthodontic appliance and the torsion attachment.

[0006] To achieve one of the above-mentioned objectives, one embodiment of the present invention provides a design method for a torsion attachment, comprising the steps of:

[0007] The working surface is generated at the reference plane according to the design quantity;

[0008] The point located at the upper edge of the action surface and having the largest vertical distance from the reference plane is selected as the second endpoint;

[0009] A first endpoint is generated at the reference plane according to the force direction of the action surface, and the direction of the second endpoint toward the first endpoint matches the force direction.

[0010] The points at the upper edge of the action surface are extended and converge to the first endpoint, thereby generating a guide surface connecting the action surface and the reference plane.

[0011] As a further improvement to one embodiment of the present invention, the step of "generating the action surface at the reference plane according to the design quantity" specifically includes:

[0012] Based on the amount of rotation and elongation, a torsional surface and an auxiliary surface are generated at the reference plane, respectively.

[0013] As a further improvement to one embodiment of the present invention, the step of "generating a first endpoint at the reference plane according to the force direction of the action surface, and the direction of the second endpoint toward the first endpoint matching the force direction" specifically includes:

[0014] A first line segment is formed by connecting the first and last ends of the first bottom edge of the torsional surface in the reference plane;

[0015] A second line segment is formed by connecting the first and last ends of the second bottom edge of the auxiliary surface in the reference plane;

[0016] Obtain the diagonal of a parallelogram with the first line segment and the second line segment or their extensions as adjacent sides;

[0017] A first endpoint is generated at the reference plane based on the diagonal. The first endpoint satisfies the following condition: the angle between the reference line segment passing through the first endpoint and located on the reference plane and the diagonal is not greater than 20°. The reference line segment is the vertical projection of the reference line segment between the second endpoint and the first endpoint onto the reference plane.

[0018] As a further improvement of one embodiment of the present invention, the angle between the baseline segment and the diagonal is no greater than 10°.

[0019] As a further improvement of one embodiment of the present invention, the length of the reference line segment is not less than 1 mm.

[0020] As a further improvement to one embodiment of the present invention, the step "extending the points of the upper edge of the working surface and converging to the first endpoint" specifically includes:

[0021] Select the point on the first line segment that is farthest from the second line segment as the third endpoint, and select the point on the second line segment that is farthest from the first line segment as the fourth endpoint;

[0022] The second endpoint, the third endpoint, and the fourth endpoint are extended and converge to the first endpoint.

[0023] As a further improvement to one embodiment of the present invention, the step of "extending the second endpoint, the third endpoint, and the fourth endpoint and converging to the first endpoint" specifically includes:

[0024] The second endpoint extends along a first preset direction until the second endpoint reaches the first endpoint, and the first preset direction simultaneously approaches the reference plane and the first endpoint;

[0025] Extend the third endpoint along the second preset direction until the third endpoint reaches the first endpoint;

[0026] The fourth endpoint extends along the third preset direction until the fourth endpoint reaches the first endpoint, and the first preset direction, the second preset direction, and the third preset direction are close to each other.

[0027] As a further improvement to one embodiment of the present invention, the step "extending the third endpoint along the second preset direction until the third endpoint reaches the first endpoint; extending the fourth endpoint along the third preset direction until the fourth endpoint reaches the first endpoint" specifically includes:

[0028] Extend the third endpoint along the second preset direction until the third endpoint reaches the first endpoint;

[0029] Generate a first connecting line that connects the third endpoint and the first endpoint and is located in the reference plane. The first connecting line is a straight line, a concave curve, or a convex curve.

[0030] Extend the fourth endpoint along the third preset direction until the fourth endpoint reaches the first endpoint;

[0031] A second connecting line is generated that connects the fourth endpoint and the first endpoint and is located in the reference plane. The second connecting line is a straight line, an inward curve, or an outward curve.

[0032] As a further improvement to one embodiment of the present invention, the step "generating an action surface at the reference plane according to the design quantity; selecting the point located at the upper edge of the action surface and having the largest vertical distance from the reference plane as the second endpoint" specifically includes:

[0033] A first line segment and a second line segment located in the reference plane are generated based on the rotation amount, the elongation amount, and a first relationship. The first relationship is defined as follows: the ratio of the rotation amount and the elongation amount is positively correlated with the ratio of the lengths of the first line segment and the second line segment.

[0034] The torsional torque is determined based on the amount of rotation and the size of the tooth to be treated.

[0035] The added height is obtained based on the torsional torque and the second relationship, which is defined as: the added height is positively correlated with the torsional torque;

[0036] Obtain the second endpoint of the added height as the vertical distance from the reference plane;

[0037] A torsional action surface passing through the second endpoint and the opposite ends of the first line segment is generated, and an auxiliary action surface passing through the second endpoint and the opposite ends of the second line segment is generated.

[0038] As a further improvement of one embodiment of the present invention, the range of the added height is 0.5mm-2mm.

[0039] As a further improvement to one embodiment of the present invention, the design method further includes the following steps:

[0040] Identify the teeth requiring orthodontic attachments based on the digital model of the jaw;

[0041] The position of the twisting attachment is determined by the addition location of the tooth to be treated;

[0042] Match the reference plane and the added position.

[0043] As a further improvement to one embodiment of the present invention, the step of "determining the teeth to be treated that require the addition of rotation attachments on the digital model of the jaw" specifically includes:

[0044] Obtain the rotation amount of each tooth when the digitized dental model changes from step K to step K+W, where K and W are positive integers;

[0045] When it is determined that the rotation amount is not less than the preset value, the corresponding tooth on the digital model of the jaw in step K is defined as the tooth to be treated that needs to have a torsion attachment added.

[0046] As a further improvement to one embodiment of the present invention, the step of "obtaining the addition position of the torsion attachment at the tooth to be treated" specifically includes:

[0047] The torsional torque is obtained based on the amount of rotation and the size of the tooth to be treated.

[0048] The position of the torsion attachment at the tooth to be treated is obtained based on the torsional torque and the third relationship. The third relationship is defined as follows: when performing mesial lingual rotation of the crown, the distance between the torsion attachment and the midline of the dentition is positively correlated with the torsion torque; when performing distal lingual rotation of the crown, the distance between the torsion attachment and the midline of the dentition is negatively correlated with the torsion torque.

[0049] As a further improvement to one embodiment of the present invention, the step of "matching the reference plane and the added position" specifically includes:

[0050] Obtain the rotation pattern of the teeth to be treated;

[0051] The reference plane is matched to the added position according to the rotation method, wherein when the crown is rotated mesially to the lingual side, the first endpoint is closer to the midline of the dentition than the second endpoint, and when the crown is rotated distally to the lingual side, the first endpoint is closer to or farther from the midline of the dentition than the second endpoint.

[0052] As a further improvement to one embodiment of the present invention, the step of "generating a guide surface connecting the working surface and the reference plane" specifically includes:

[0053] Obtain the placement trajectory of a dental orthodontic appliance, the dental orthodontic appliance including a receiving cavity that matches the torsion attachment;

[0054] A first guide surface is generated based on the positioning trajectory to connect the action surface and the reference plane. The first guide surface has a path trajectory that matches the positioning trajectory.

[0055] As a further improvement to one embodiment of the present invention, the step of "obtaining the placement trajectory of the dental orthodontic appliance" specifically includes:

[0056] Obtain a first positioning trajectory formed by N1 points of the first guiding edge and a second positioning trajectory formed by N2 points of the second guiding edge. The first guiding edge is located at the gingival end of the dental orthodontic appliance and is set corresponding to the receiving cavity. The second guiding edge is located at the edge of the receiving cavity and is set close to the gingival end of the dental orthodontic appliance.

[0057] As a further improvement to one embodiment of the present invention, the step of "generating a guide surface connecting the working surface and the reference plane" specifically includes:

[0058] Obtain the dislocation trajectory of a dental orthodontic appliance, the dental orthodontic appliance including a receiving cavity that matches the torsion attachment;

[0059] A second guide surface is generated based on the dislocation trajectory to connect the action surface and the reference plane. The second guide surface has a path trajectory that matches the dislocation trajectory.

[0060] As a further improvement to one embodiment of the present invention, the step of "obtaining the dislocation trajectory of the dental orthodontic appliance" specifically includes:

[0061] Obtain the first dislocation trajectory formed by M1 points of the third guide edge and the second dislocation trajectory formed by M2 points of the fourth guide edge. The third guide edge is located at the edge of the receiving cavity and is set close to the gingival end of the dental orthodontic appliance. The fourth guide edge is located at the gingival end of the dental orthodontic appliance and is set corresponding to the receiving cavity.

[0062] As a further improvement to one embodiment of the present invention, the step of "generating a guide surface connecting the working surface and the reference plane" specifically includes:

[0063] Generate a guide line connecting the first endpoint and the second endpoint;

[0064] A first guide surface and a second guide surface are generated on both sides of the guide line. A reference line segment is formed between the first endpoint and the second endpoint. The guide line is a curve and is located on the side of the reference line segment closer to the second guide surface.

[0065] To achieve one of the above-mentioned objectives, one embodiment of the present invention provides a computer-readable storage medium having a computer program stored thereon, wherein the computer program, when executed by a processor, implements the steps in the design method of the torsion attachment as described in any of the above technical solutions.

[0066] To achieve one of the above-mentioned objectives, one embodiment of the present invention provides a design system for torsion attachments. The design system includes a memory and a processor. The memory stores a computer program that can run on the processor. When the processor executes the computer program, it implements the steps in the design method for torsion attachments as described in any of the above technical solutions.

[0067] To achieve one of the above-mentioned objectives, one embodiment of the present invention provides a method for molding a dental orthodontic appliance, comprising the following steps:

[0068] The torsion attachment located in the digital model of the dentition is generated according to the design method of the torsion attachment described in any of the above technical solutions;

[0069] A dental orthodontic appliance with a receiving cavity is generated based on the digital model of the jaw and the torsion attachment, the receiving cavity being matched with the torsion attachment.

[0070] Compared with the prior art, the beneficial effect of one embodiment of the present invention is that the force direction of the torsion attachment working surface obtained by the design method of one embodiment of the present invention matches the direction of the second end toward the first end. When wearing a dental orthodontic appliance, unnecessary contact and force between the receiving cavity of the dental orthodontic appliance and the torsion attachment can be reduced, thereby achieving precise force on the teeth to be treated. Attached Figure Description

[0071] Figure 1 This is a step diagram of the design method of a torsion attachment according to an embodiment of the present invention;

[0072] Figure 2 This is a schematic diagram of a dental orthodontic appliance and a tooth to be treated according to an embodiment of the present invention.

[0073] Figure 3 This is a schematic diagram of a torsion attachment according to an embodiment of the present invention from a first perspective;

[0074] Figure 4 This is a schematic diagram of the torsion attachment of the receiving cavity of a dental orthodontic appliance according to an embodiment of the present invention;

[0075] Figure 5 This is a step diagram illustrating the process of obtaining the torsional action surface and the auxiliary action surface according to an embodiment of the present invention;

[0076] Figure 6 This is a graph showing the relationship between the height of the torsion attachment and the torsion torque according to an embodiment of the present invention;

[0077] Figure 7 This is a perspective view of the torsion attachment according to an embodiment of the present invention from a second perspective;

[0078] Figure 8 yes Figure 7 Sectional view of J1-J1;

[0079] Figure 9 yes Figure 7 Sectional view of J2-J2;

[0080] Figure 10 This is a schematic projection of the torsion attachment portion structure of an embodiment of the present invention in a reference plane;

[0081] Figure 11 This is a flowchart illustrating the steps of obtaining the first endpoint according to an embodiment of the present invention;

[0082] Figure 12 This is a perspective view of the torsion attachment according to an embodiment of the present invention from a third perspective;

[0083] Figure 13 This is a flowchart illustrating the steps of obtaining a first endpoint by converging the second endpoint, the third endpoint, and the fourth endpoint according to an embodiment of the present invention.

[0084] Figure 14 This is a detailed step diagram illustrating how the first endpoint is obtained by converging the second endpoint, the third endpoint, and the fourth endpoint according to an embodiment of the present invention.

[0085] Figure 15 This is a step diagram illustrating the steps for confirming the addition location according to an embodiment of the present invention;

[0086] Figure 16 This is a schematic diagram of a digital model of the jaw according to an embodiment of the present invention;

[0087] Figure 17 This is a schematic diagram of a tooth to be treated with a torsion attachment undergoing mesial lingual rotation of the crown according to an embodiment of the present invention.

[0088] Figure 18 This is a diagram showing the relationship between the addition position of the torsion attachment in the mesiodistal direction and the torsion torque when performing a lingual rotation of the coronary artery in one embodiment of the present invention.

[0089] Figure 19 This is a schematic diagram of a tooth to be treated with a torsion attachment being rotated distally and lingually according to an embodiment of the present invention.

[0090] Figure 20 This is a diagram showing the relationship between the addition position of the torsion attachment in the mesiodistal direction and the torsion torque when performing lingual rotation of the distal coronal lateral side according to an embodiment of the present invention.

[0091] Figure 21 This is a schematic diagram of the dental orthodontic appliance according to an embodiment of the present invention, showing the cavity of the appliance cooperating with the torsion attachment and performing a lingual rotation of the crown near the midline.

[0092] Figure 22 yes Figure 21 Schematic diagram of the placement process of the orthodontic appliance housing in a traditional Chinese dental clinic;

[0093] Figure 23 This is a schematic diagram of the dental orthodontic appliance according to an embodiment of the present invention, showing the cavity of the appliance cooperating with the torsion attachment and performing lingual rotation at the distal coronal side;

[0094] Figure 24 yes Figure 23 Schematic diagram of the placement process of the orthodontic appliance housing in a traditional Chinese dental clinic;

[0095] Figure 25 This is a step diagram of generating a first guide surface based on the positioning trajectory according to an embodiment of the present invention;

[0096] Figure 26 This is a schematic diagram of the dental orthodontic appliance being placed in position according to an embodiment of the present invention.

[0097] Figure 27 This is a schematic diagram of the path of the first guide edge and the second guide edge on the dental orthodontic appliance according to an embodiment of the present invention during the positioning process.

[0098] Figure 28 This is a step diagram illustrating the generation of a second guide surface based on the dislocation trajectory according to an embodiment of the present invention;

[0099] Figure 29This is a schematic diagram of the dental orthodontic appliance in the dislocation process according to an embodiment of the present invention;

[0100] Figure 30 This is a schematic diagram of the path of the third and fourth guide edges on the dental orthodontic appliance according to an embodiment of the present invention during the positioning process.

[0101] Figure 31 This is a perspective view of the torsion attachment according to an embodiment of the present invention from a fourth perspective;

[0102] Figure 32 This is a step diagram illustrating the generation of guide lines, a first guide surface, and a second guide surface according to an embodiment of the present invention;

[0103] Figure 33 This is a schematic block diagram of a processor according to an embodiment of the present invention;

[0104] Figure 34 This is a step diagram illustrating the molding method of a dental orthodontic appliance according to an embodiment of the present invention. Detailed Implementation

[0105] The present invention will now be described in detail with reference to the specific embodiments shown in the accompanying drawings. However, these embodiments do not limit the present invention, and any structural, methodological, or functional modifications made by those skilled in the art based on these embodiments are included within the scope of protection of the present invention.

[0106] Combination Figures 1 to 3 The design method of the torsion attachment 100 according to one embodiment of the present invention includes the following steps:

[0107] S100: Generate the action surface P at the reference plane P1 according to the design quantity;

[0108] Here, considering that the surface of the tooth T to be treated is an irregular surface, and the bottom surface 10 of the torsion attachment 100 attached to the tooth T to be treated is also a curved surface, for ease of explanation, the bottom surface 10 of the torsion attachment 100 is characterized by the reference plane P1, and the action surface P is generated on the reference plane P1.

[0109] S102: Select the point located at the upper edge P' of the action surface P and with the largest vertical distance from the reference plane P1 as the second endpoint C2;

[0110] S104: Based on the force direction of the action surface P, the first endpoint C1 is generated at the reference plane P1, and the direction of the second endpoint C2 toward the first endpoint C1 matches the force direction.

[0111] Here, "mutual matching" means that the direction of the second endpoint C2 toward the first endpoint C1 is roughly consistent with the direction of the force, and there may be a certain angle between the direction of the second endpoint C2 toward the first endpoint C1 and the direction of the force.

[0112] S106: Extend the upper edge P' of the action surface P and converge it to the first endpoint C1, thereby generating the guide surface 13 that connects the action surface P and the reference plane P1.

[0113] Here, "the points of the upper edge P' of the action surface P and their convergence to the first endpoint C1" means that multiple points of the upper edge P' of the action surface P extend closer to each other until the multiple points converge to the first endpoint C1.

[0114] It should be noted that, unless there is a necessary sequential relationship, the order of the above steps S100-S106 can be adjusted according to the actual situation, and the same applies below.

[0115] This embodiment requires that the force direction of the action surface P matches the direction of the second endpoint C2 toward the first endpoint C1. When the dental orthodontic appliance 200 is worn, unnecessary contact and force between the receiving cavity S1 of the dental orthodontic appliance 200 and the torsion attachment 100 can be reduced, thereby achieving precise force on the teeth to be treated.

[0116] In this embodiment, the action surface P is described as including the torsional action surface 11 and the auxiliary action surface 12. In other embodiments, the action surface P may also include other numbers or other action surfaces. For example, the action surface P may include only one surface, or the action surface P may include two or more surfaces.

[0117] Step S100 includes:

[0118] Based on the rotation amount Rz and the elongation amount ΔY, a torsional action surface 11 and an auxiliary action surface 12 are generated at the reference plane P1, respectively.

[0119] In other words, in this embodiment, the action surface P includes both the torsional action surface 11 and the auxiliary action surface 12, which can reduce the risk of compression while performing the rotational function.

[0120] Specifically, in combination Figure 4 When the torsion attachment 100 is attached to the tooth T to be treated and the orthodontic appliance 200 is worn, the receiving cavity S1 on the orthodontic appliance 200 applies force to the torsion attachment 100. The receiving cavity S1 includes a first contact surface S11 and a second contact surface S12. The first contact surface S11 generates a first force F1 on the torsion action surface 11, and the second contact surface S12 generates a second force F2 on the auxiliary action surface 12.

[0121] The first force F1 drives the tooth T to be treated to rotate mesially or distally on the lingual side of the crown, that is, the first force F1 is used to generate the rotation amount Rz.

[0122] The second force F2 causes the tooth T to move in the opposite direction of the indentation force, that is, the second force F2 is used to generate elongation.

[0123] Here, when the first force F1 causes the tooth T to be treated to rotate, it is sometimes accompanied by the generation of a depressing force F3. At this time, the depressing force F3 is an undesigned side effect force that will cause depressing risk. In this embodiment, the second force F2 has a component force in the opposite direction to the depressing force F3. That is, the second force F2 can partially or completely offset the depressing force F3, thereby greatly reducing the depressing risk.

[0124] In a specific example, combined Figure 5 Steps S100 and S102 include:

[0125] S1001: Generate the first line segment L1 and the second line segment L2 located in the reference plane P1 based on the rotation amount Rz, the elongation amount △Y and the first relational formula. The first relational formula is defined as: the ratio of the rotation amount Rz and the elongation amount △Y is positively correlated with the ratio of the lengths of the first line segment L1 and the second line segment L2.

[0126] Here, the different length ratios of the first segment L1 and the second segment L2 determine the different main functions of the torsion attachment 100. The appropriate lengths of the first segment L1 and the second segment L2 can be selected according to the actual rotation amount Rz and elongation amount ΔY required by the tooth T to be treated. The larger the length, the higher the stability of the corresponding force during the force application process.

[0127] Specifically, when the tooth to be treated, T, mainly needs to perform rotational movements, the length of the first segment L1 can be appropriately increased to improve the stability of the first force F1; when the tooth to be treated, T, needs to perform a large elongation, the length of the second segment L2 can be appropriately increased to improve the stability of the second force F2. The ratio of the lengths of the first segment L1 and the second segment L2 can be adaptively adjusted according to different combinations of movements of the tooth to be treated, T.

[0128] S1002: Obtain the torsional torque Mz based on the rotation amount Rz and the size of the tooth T to be treated;

[0129] Here, for teeth T of different sizes to be treated, the required torsional torque Mz is different based on the same rotation amount Rz. Therefore, it is necessary to obtain the corresponding torsional torque Mz according to certain rules based on the rotation amount Rz and the size of the tooth T to be treated. Alternatively, the torsional torque Mz can be obtained directly from a pre-set reference table (such as a reference table of rotation amount Rz, size of the tooth T to be treated, and torsional torque Mz).

[0130] S1003: Obtain the added height h based on the torsional moment Mz and the second relational formula, which is defined as: (Combined with...) Figure 6The added height h is positively correlated with the torsional torque Mz;

[0131] Here, the added height h is the maximum height of the subsequently generated action surface P, and the added height h is also the maximum height of the entire torsion attachment 100. When the added height h is too small, the torsional torque Mz generated by the torsion attachment 100 is small, the torsion effect is poor, or even no torsion effect is achieved. When the added height h reaches a certain amount, the added height h and the torsional torque Mz are directly proportional.

[0132] However, considering that adding too much height h would increase the difficulty of demolding the torsion attachment 100 and cause interference in the oral cavity, the added height h needs to be selected within a suitable range. When the added height h is in the range of 0.5mm-2mm, it can effectively generate a significant torsion torque Mz without affecting the demolding process.

[0133] S1004: Obtain the second endpoint C2 with the added height h as the vertical distance from the reference plane P1;

[0134] Here, the second endpoint C2 is not only the maximum height of the action surface P, but also the maximum height of the finally formed torsion attachment 100.

[0135] S1005: Generate a torsional action surface 11 passing through the second endpoint C2 and the two opposite ends of the first line segment L1, and generate an auxiliary action surface 12 passing through the second endpoint C2 and the two opposite ends of the second line segment L2.

[0136] Here, the torsional action surface 11 and the auxiliary action surface 12 can be a plane, an inner concave curved surface, or an outer convex curved surface.

[0137] A concave surface is defined as a surface that is recessed towards the center of gravity of the torsion attachment 100, and a convex surface is defined as a surface that protrudes away from the center of gravity of the torsion attachment 100. The specific shapes of the torsion action surface 11 and the auxiliary action surface 12 can be selected according to actual needs. Here, we take the example that both the torsion action surface 11 and the auxiliary action surface 12 are convex surfaces.

[0138] It should be noted that the generated torsional action surface 11 and the auxiliary action surface 12 can be directly connected or indirectly connected.

[0139] In practice, combined with Figures 7 to 9 The spatial position of the second endpoint C2 can be further determined based on the angle setting.

[0140] Specifically, a torsion plane 112 is formed between the second endpoint C2 and the first line segment L1, and an auxiliary plane 122 is formed between the second endpoint C2 and the second line segment L2. The torsion plane 112 and the reference plane P1 have a third included angle α3, and the auxiliary plane 122 and the reference plane P1 have a fourth included angle α4. The third included angle α3 and the fourth included angle α4 are acute angles or right angles.

[0141] Here, the range of the third included angle α3 is 60°-90°, and the range of the fourth included angle α4 is 60°-90°.

[0142] In a specific example, the range of the third included angle α3 is 75°-85°, and the range of the fourth included angle α4 is 75°-85°.

[0143] Here, by designing the third included angle α3 and the fourth included angle α4 as acute angles, the retention effect of the auxiliary surface 11 can be effectively improved without weakening the torsional moment generated by the torsional action surface 11, and the demolding difficulty can be reduced to a certain extent.

[0144] In this embodiment, combined with Figure 10 and Figure 11 Step S104 specifically includes:

[0145] S1041: The first line segment L1 is formed by connecting the first and last ends of the first bottom edge 111 of the torsional surface 11 in the reference plane P1;

[0146] S1042: The second line segment L2 is formed by connecting the first and last ends of the second bottom edge 121 in the reference plane P1 to the auxiliary surface 12;

[0147] S1043: Obtain the diagonal L3 of parallelogram P2 with the first line segment L1 and the second line segment L2 or their extensions as adjacent sides;

[0148] Here, when the first line segment L1 and the second line segment L2 are directly connected, the first line segment L1 and the second line segment L2 have an intersection point A. When the first line segment L1 and the second line segment L2 are disconnected from each other, the extensions of the first line segment L1 and the second line segment L2 have an intersection point A. The diagonal L3 of the parallelogram P2 passes through the intersection point A.

[0149] S1044: Generate the first endpoint C1 at the reference plane P1 based on the diagonal L3. The first endpoint C1 satisfies the following: the angle θ between the reference line segment D' passing through the first endpoint C1 and located at the reference plane P1 and the diagonal L3 is not greater than 20°. The reference line segment D' is the vertical projection of the reference line segment D between the second endpoint C2 and the first endpoint C1 into the reference plane P1.

[0150] In other words, this implementation method needs to ensure that the extension direction of the diagonal L3 is basically consistent with that of the reference line segment D'. When the dental orthodontic appliance 200 is worn, unnecessary contact and force between the receiving cavity S1 of the dental orthodontic appliance 200 and the torsion attachment 100 can be reduced, thereby achieving precise force on the teeth to be treated.

[0151] In a specific example, the angle between the projection of the resultant force of the torsional surface 11 and the auxiliary surface 12 onto the reference plane P1 and the reference line segment D' is not greater than 10°. That is, the angle θ between the diagonal L3 and the reference line segment D' is not greater than 10°.

[0152] In this embodiment, combined with Figure 12 The length of reference line segment D is not less than 1mm.

[0153] Understandably, when the length of the reference line segment D is too small, the overall size of the torsion attachment 100 will be small, which will affect the stability of the fit between the dental orthodontic appliance 200 and the torsion attachment 100.

[0154] In this embodiment, combined with Figure 13 and Figure 14 The step S106, "extending the upper edge P' of the action surface P and converging it to the first endpoint C1", specifically includes:

[0155] S1061: Select the point of the first line segment L1 that is far away from the second line segment L2 as the third endpoint C3, and select the point of the second line segment L2 that is far away from the first line segment L1 as the fourth endpoint C4.

[0156] S1062: Extend the second endpoint C2, the third endpoint C3 and the fourth endpoint C4 and converge to the first endpoint C1.

[0157] Here, step "S1062" specifically includes:

[0158] S1062a: Extend the second endpoint C2 along the first preset direction until the second endpoint C2 reaches the first endpoint C1, and the first preset direction simultaneously approaches the reference plane P1 and the first endpoint C1;

[0159] S1062b: Extend the third endpoint C3 along the second preset direction until the third endpoint C3 reaches the first endpoint C1;

[0160] Here, during the process of the third endpoint C3 extending along the second preset direction, a first connecting line E1 is generated that connects the third endpoint C3 and the first endpoint C1 and is located in the reference plane P1. The first connecting line E1 is a straight line, an inward curve, or an outward curve.

[0161] S1062c: Extend the fourth endpoint C4 along the third preset direction until the fourth endpoint C4 reaches the first endpoint C1, and the first preset direction, the second preset direction and the third preset direction are close to each other.

[0162] Here, as the fourth endpoint C4 extends along the third preset direction, a second connecting line E2 is generated that connects the fourth endpoint C4 and the first endpoint C1 and is located in the reference plane P1. The second connecting line E2 is a straight line, an inward curve, or an outward curve.

[0163] It is understandable that a concave curve refers to a curve that bends toward the center of gravity of the torsion attachment 100, while a convex curve refers to a curve that bends away from the center of gravity of the torsion attachment 100. In this embodiment, the first connecting line E1 is a concave curve and the second connecting line E2 is a convex curve, but this is not a limitation.

[0164] In this embodiment, combined with Figure 15 and Figure 16 The design method for twisting annex 100 also includes the following steps:

[0165] S200: Identify the teeth T to be treated that require the addition of rotation attachment 100 on the digital model of the jawbone 300;

[0166] Specifically, step S200 includes:

[0167] Obtain the rotation amount Rz of each tooth when the digital model of the jaw changes from step K to step K+W, where K and W are positive integers;

[0168] In the example of orthodontic treatment using a dental orthodontic appliance 200, the treatment is usually divided into multiple successive stages (e.g., 20 to 40 successive stages). Each stage corresponds to a dental orthodontic appliance 200, that is, each stage needs to correspond to a digital model of the jaw 300. By taking the digital model of the jaw 300 at step K+W as the target state, the rotation amount Rz that needs to be designed for each tooth when the digital model of the jaw 300 at step K changes to the digital model of the jaw 300 at step K+W can be obtained.

[0169] When the rotation amount Rz is determined to be not less than the preset value, the corresponding tooth on the digital model 300 of the jawbone in step K is defined as the tooth T to be treated that needs to have the torsion attachment 100 added.

[0170] Here, when the required rotation amount Rz for a tooth is less than the preset value, the rotation amount Rz can be achieved by the design amount of the dental orthodontic appliance 200 itself, so there is no need to set the torsion attachment 100 on the tooth to increase the rotation amount Rz; when the required rotation amount Rz for a tooth is not less than the preset value, the rotation amount Rz cannot be achieved by the design amount of the dental orthodontic appliance 200 itself, and the torsion attachment 100 attached to the tooth is needed to achieve the rotation amount Rz.

[0171] S202: Determine the insertion position of the twist attachment 100 on the tooth T to be treated;

[0172] Specifically, step S202 includes:

[0173] The torsional torque Mz is obtained based on the rotation amount Rz and the size of the tooth T to be treated;

[0174] The addition position of the torsion attachment 100 at the tooth T to be treated is obtained based on the torsional torque Mz and the third relation. The third relation is defined as: combining Figure 17 and Figure 18 When performing mesial lingual rotation of the crown, the distance between the torsion attachment 100 and the dental midline Z is positively correlated with the torsion torque Mz. Figure 19 and Figure 20 When performing distal lingual rotation of the crown, the distance between the torsion attachment 100 and the dental midline Z is negatively correlated with the torsion torque Mz.

[0175] S204: Match reference plane P1 and add position.

[0176] Here, in a specific example, the reference plane P1 is used as the bottom surface 10 to generate the torsion attachment 100, and then the reference plane P1 is matched to the addition position, that is, the torsion attachment 100 is attached to the addition position through the reference plane P1. Of course, in other examples, the torsion attachment 100 can also be generated directly at the addition position of the tooth T to be treated in the digital model of the jaw 300.

[0177] Specifically, step S204 includes:

[0178] Obtain the rotation pattern of the tooth T to be treated;

[0179] The reference plane P1 is matched to the added position according to the rotation method, wherein, combined with Figure 21 and Figure 22 When performing mesial lingual rotation of the crown, the first endpoint C1 is closer to the dental midline Z than the second endpoint C2. When performing distal lingual rotation of the crown, combined with... Figure 23 and Figure 24 The first endpoint C1 is closer to or farther from the dental midline Z than the second endpoint C2.

[0180] Specifically, when the twist attachment 100 is used for mesial lingual rotation of the crown, the first endpoint C1 is located on the occlusal side of the second endpoint C2, and the first endpoint C1 is closer to the dental midline Z than the second endpoint C2. When the twist attachment 100 is used for distal lingual rotation of the crown, the first endpoint C1 is located on the occlusal side of the second endpoint C2, and the first endpoint C1 is farther away from the dental midline Z than the second endpoint C2.

[0181] In other words, when the attachment 100 is twisted and attached to the tooth T to be treated, the second endpoint C2, the third endpoint C3 and the fourth endpoint C4 extend toward the occlusal surface A2 and toward or away from the midline Z of the dental arch and converge at the first endpoint C1.

[0182] As can be seen, the resultant force of the first force F1 and the second force F2 in this embodiment is inclined towards the near center direction, and the reference line segment D is also inclined towards the near center direction. This embodiment designs the resultant force of the first force F1 and the second force F2 to match the extension direction of the reference line segment D, so that the relative motion trend between the receiving cavity S1 and the torsion attachment 100 extends along the reference line segment D, avoiding unnecessary contact between the receiving cavity S1 and the torsion attachment 100.

[0183] To put it another way, let's continue to combine Figure 21 and Figure 22 In this embodiment, the dental orthodontic appliance 200 includes a reference point C5 corresponding to the second endpoint C2 in its receiving cavity S1. When the twisting attachment 100 is attached to the tooth T to be treated and the receiving cavity S1 is in the process of dislocation or placement, if the twisting attachment 100 is used for mesial lingual rotation of the crown, the reference point C5 is always located on the mesial side and occlusal side of the second endpoint C2. If the twisting attachment 100 is used for distal lingual rotation of the crown, combined with... Figure 23 and Figure 24 Then the reference point C5 is always located on the distal side and occlusal side of the second endpoint C2.

[0184] It should be noted that "the receiving cavity S1 is in the process of dislocation or placement" refers to the placement process from when the receiving cavity S1 comes into contact with the torsion attachment 100 to when the receiving cavity S1 completely covers the torsion attachment 100, and the dislocation process from when the receiving cavity S1 begins to detach from the torsion attachment 100 to when the receiving cavity S1 completely detaches from the torsion attachment 100.

[0185] In addition, in this embodiment, the relative positional relationship between the accommodating cavity S1 and the torsion attachment 100 is characterized by the relative positional relationship between the reference point C5 and the second endpoint C2. The relative positional relationship between other points on the accommodating cavity S1 and the corresponding points on the torsion attachment 100 can be referenced to the relative positional relationship between the reference point C5 and the second endpoint C2.

[0186] As can be seen, taking the twisting attachment 100 for lingual rotation of the coronal mesial region as an example, combined with... Figure 21 and Figure 22 The first endpoint C1 is located on the mesial and occlusal side of the second endpoint C2. When the receiving cavity S1 is in the process of being positioned, the reference point C5 moves towards the second endpoint C2 along the mesial to distal direction and along the occlusal surface A2 towards the gingival line A3 (reference). Figure 22 (The dashed arrow in the image) until the reference point C5 contacts the second endpoint C2. The positioning trajectory of the reference point C5 is consistent with the extension trajectory of the first endpoint C1 toward the second endpoint C2. That is, the positioning trajectory of the receiving cavity S1 matches the extension trajectory of the torsion attachment 100, which can reduce unnecessary friction between the receiving cavity S1 and the torsion attachment 100 during the positioning process.

[0187] In addition, the size of the twisting attachment 100 increases from small to large in the direction from the occlusal surface A2 toward the gingival line A3. When the receiving cavity S1 is in the process of being positioned, the lower part of the larger size of the receiving cavity S1 contacts the upper part of the smaller size of the twisting attachment 100 first, which can also reduce unnecessary friction between the receiving cavity S1 and the twisting attachment 100 during the positioning process.

[0188] Similarly, the dislocation trajectory of the receiving cavity S1 matches the extension trajectory of the torsion attachment 100, which can reduce unnecessary friction between the receiving cavity S1 and the torsion attachment 100 during the dislocation process.

[0189] The torsion attachment 100 is used for the positioning and dislocation processes during the lingual rotation of the distal coronal region, as described above. It can also reduce unnecessary friction between the receiving cavity S1 and the torsion attachment 100 during the positioning and dislocation processes, which will not be elaborated here.

[0190] In this embodiment, combined with Figure 25 The step S106, "generating the connecting action surface P and the guide surface 13 of the reference plane P1", specifically includes:

[0191] S1063: Obtain the placement trajectory G1, G2 of the dental orthodontic appliance 200, which includes a receiving cavity S1 that matches the torsion attachment 100.

[0192] Here, obtaining the in-situ trajectories G1 and G2 specifically includes:

[0193] Obtain the first positioning trajectory G1 formed by N1 points of the first guide edge 21 and the second positioning trajectory G2 formed by N2 points of the second guide edge 22. The first guide edge 21 is located at the gingival end A4 of the dental orthodontic appliance 200 and is set corresponding to the receiving cavity S1. The second guide edge 22 is located at the edge of the receiving cavity S1 and is set close to the gingival end A4 of the dental orthodontic appliance 200.

[0194] S1064: Generate a first guide surface 131 connecting the action surface P and the reference plane P1 based on the positioning trajectories G1 and G2. The first guide surface 131 has path trajectories G1' and G2' that match the positioning trajectories G1 and G2.

[0195] Specifically, in combination Figure 26 and Figure 27 This illustrates the placement process of the dental orthodontic appliance 200.

[0196] The guide portion 20 includes a first guide edge 21 located at the gingival end A4 of the dental orthodontic appliance 200, the first guide edge 21 being disposed corresponding to the receiving cavity S1, and the guide portion 20 also includes a second guide edge 22 located at the edge of the receiving cavity S1, the second guide edge 22 being disposed close to the gingival end A4 of the dental orthodontic appliance 200.

[0197] When the dental orthodontic appliance 200 is in the process of being positioned, the first positioning trajectory G1 formed by N1 points on the first guide edge 21 matches the first path trajectory G1' on the first guide surface 131, and the second positioning trajectory G2 formed by N2 points on the second guide edge 22 matches the second path trajectory G2' on the first guide surface 131, where N1 and N2 are positive integers.

[0198] Here, "the first guide edge 21 is set to correspond to the receiving cavity S1" means that the first guide edge 21 is located in the area directly below the receiving cavity S1, and "the second guide edge 22 is set near the gingival end A4 of the dental orthodontic appliance 200" means that the second guide edge 22 is in the bottom area of ​​the receiving cavity S1 near the gingival end A4.

[0199] When the dental orthodontic appliance 200 is in the process of being positioned, one or more points on the first guide edge 21 first slide into contact with the first guide surface 131, and then one or more points on the second guide edge 22 slide into contact with the first guide surface 131 until the first guide edge 21 and the second guide edge 22 disengage from the first guide surface 131 so that the receiving cavity S1 fits into the torsion attachment 100. The first sliding contact area formed by the first guide edge 21 on the first guide surface 131 is the first path trajectory G1', and the second sliding contact area formed by the second guide edge 22 on the first guide surface 131 is the second path trajectory G2'. The first path trajectory G1' and the second path trajectory G2' can be two different trajectories located on the first guide surface 131.

[0200] It is understood that the first sliding contact area corresponds to the first positioning trajectory G1 formed by the first guide edge 21 and the first path trajectory G1' on the first guide surface 131, respectively, and the second sliding contact area corresponds to the second positioning trajectory G2 formed by the second guide edge 22 and the second path trajectory G2' on the first guide surface 131, respectively.

[0201] Meanwhile, since the first positioning trajectory G1 and the first path trajectory G1' are matched with each other, and the second positioning trajectory G2 and the second path trajectory G2' are matched with each other, during the contact guidance positioning process, the first guide edge 21, the second guide edge 22 and the first guide surface 131 are less likely to squeeze each other and cause excessive local friction. This avoids wear and tear of the dental orthodontic appliance 200 and the torsion attachment 100, and displacement of the torsion attachment 100 during multiple wears, thereby ensuring the accuracy of the dental orthodontic appliance 200 and the torsion attachment 100 in multiple wears and improving the orthodontic effect.

[0202] Of course, the first positioning trajectory G1 does not need to be an absolute match with the first path trajectory G1'. There can be a certain error range between the two. Similarly, the second positioning trajectory G2 does not need to be an absolute match with the second path trajectory G2'. There can be a certain error range between the two.

[0203] For ease of explanation, the first positioning trajectory G1, the second positioning trajectory G2, the first path trajectory G1', and the second path trajectory G2' are shown as simple curves. In reality, the N1 points on the first guiding edge 21 and the N2 points on the second guiding edge 22 may irregularly and alternately contact the first guiding surface 131, resulting in a more complex form for the first positioning trajectory G1, the second positioning trajectory G2, the first path trajectory G1', and the second path trajectory G2'. The same applies below.

[0204] It should be noted that the placement process of the orthodontic appliance 200 usually involves first pressing the appliance 200 into the anterior teeth area (see...). Figure 26 (Solid arrow in the anterior and middle teeth area), then press into the posterior teeth area to achieve placement (see...) Figure 26 (The dashed arrow in the middle and posterior tooth region) At this time, the first positioning trajectory G1 and the second positioning trajectory G2 are irregular spiral-like positioning trajectories.

[0205] In practice, the first positioning trajectory G1 and the second positioning trajectory G2 can be obtained by simulating the positioning process of the dental orthodontic appliance 200 or by analyzing big data, and the shape of the first guide surface 131 can be controlled so that the first guide surface 131 has a first path trajectory G1' and a second path trajectory G2' that match the first positioning trajectory G1 and the second positioning trajectory G2.

[0206] In this embodiment, combined with Figure 28 The step S106, "generating the connecting action surface P and the guide surface 13 of the reference plane P1", specifically includes:

[0207] S1065: Obtain the dislocation trajectory G3, G4 of the dental orthodontic appliance 200, which includes a receiving cavity S1 that matches the torsion attachment 100.

[0208] Here, obtaining the dislocation trajectories G3 and G4 specifically includes:

[0209] The first dislocation trajectory G3 formed by M1 points of the third guide edge 23 and the second dislocation trajectory G4 formed by M2 points of the fourth guide edge 24 are obtained. The third guide edge 23 is located at the edge of the receiving cavity S1 and is set close to the gingival end A4 of the dental orthodontic appliance 200. The fourth guide edge 24 is located at the gingival end A4 of the dental orthodontic appliance 200 and is set corresponding to the receiving cavity S1.

[0210] S1066: Generate a second guide surface 132 connecting the action surface P and the reference plane P1 based on the dislocation trajectories G3 and G4. The second guide surface 132 has path trajectories G3' and G4' that match the dislocation trajectories G3 and G4.

[0211] Specifically, in combination Figure 29 and Figure 30 This illustrates the dislocation process of the dental orthodontic appliance 200.

[0212] The guide portion 20 includes a third guide edge 23 located at the edge of the receiving cavity S1, the third guide edge 23 being disposed near the gingival end A4 of the dental orthodontic appliance 200, and the guide portion 20 also includes a fourth guide edge 24 disposed at the gingival end A4 of the dental orthodontic appliance 200, the fourth guide edge 24 being disposed corresponding to the receiving cavity S1.

[0213] When the dental orthodontic appliance 200 is in the process of dislocation, the first dislocation trajectory G3 formed by M1 points on the third guide edge 23 matches the third path trajectory G3' on the second guide surface 132, and the second dislocation trajectory G4 formed by M2 points on the fourth guide edge 24 matches the fourth path trajectory G4' on the second guide surface 132, where M1 and M2 are positive integers.

[0214] Here, "the third guide edge 23 is set near the gingival end A4 of the dental orthodontic appliance 200" means that the third guide edge 23 is the bottom area of ​​the receiving cavity S1 near the gingival end A4, and "the fourth guide edge 24 is set in the area corresponding to the receiving cavity S1" means that the fourth guide edge 24 is located in the area directly below the receiving cavity S1.

[0215] When the dental orthodontic appliance 200 is in the process of dislocation, one or more points on the third guide edge 23 first slide into contact with the second guide surface 132, and then one or more points on the fourth guide edge 24 slide into contact with the second guide surface 132 until the third guide edge 23 and the fourth guide edge 24 disengage from the second guide surface 132, thereby causing the receiving cavity S1 to disengage from the torsion attachment 100. The third sliding contact area formed by the third guide edge 23 on the second guide surface 132 is the third path trajectory G3', and the fourth sliding contact area formed by the fourth guide edge 24 on the second guide surface 132 is the fourth path trajectory G4'. The third path trajectory G3' and the fourth path trajectory G4' can be two different trajectories located on the second guide surface 132.

[0216] It is understandable that the third sliding contact area corresponds to the first dislocation trajectory G3 formed by the third guide edge 23 and the third path trajectory G3' on the second guide surface 132, respectively, and the fourth sliding contact area corresponds to the second dislocation trajectory G4 formed by the fourth guide edge 24 and the fourth path trajectory G4' on the second guide surface 132, respectively.

[0217] Meanwhile, since the first dislocation trajectory G3 and the third path trajectory G3' match each other, and the second dislocation trajectory G4 and the fourth path trajectory G4' match each other, during the contact-guided dislocation process, the third guide edge 23, the fourth guide edge 24 and the second guide surface 132 are less likely to be squeezed against each other, resulting in excessive local friction. This avoids wear and displacement of the dental orthodontic appliance 200 and the torsion attachment 100 during multiple removals, thereby ensuring the accuracy of the dental orthodontic appliance 200 and the torsion attachment 100 during multiple removals and improving the orthodontic effect.

[0218] Of course, the first dislocation trajectory G3 does not need to be an absolute match with the third path trajectory G3'. There can be a certain error range between the two. Similarly, the second dislocation trajectory G4 does not need to be an absolute match with the fourth path trajectory G4'. There can be a certain error range between the two.

[0219] In practice, the first dislocation trajectory G3 and the second dislocation trajectory G4 can be obtained by simulating the dislocation process of the dental orthodontic appliance 200 or by analyzing big data, and the shape of the second guide surface 132 can be controlled so that the second guide surface 132 has a third path trajectory G3' and a fourth path trajectory G4' that match the first dislocation trajectory G3 and the second dislocation trajectory G4.

[0220] In a specific example, combined Figure 31 and Figure 32 The step S106, "generating the connecting action surface P and the guide surface 13 of the reference plane P1", specifically includes:

[0221] S1067: Generate a guide line C connecting the first endpoint C1 and the second endpoint C2;

[0222] S1068: Generate a first guide surface 131 and a second guide surface 132 located on both sides of the guide line C. A reference line segment D is formed between the first endpoint C1 and the second endpoint C2. The guide line C is a curve and is located on the side of the reference line segment D closer to the second guide surface 132.

[0223] Here, the guide line C is a solid line, that is, there is a clear dividing line between the first guide surface 131 and the second guide surface 132. This dividing line is a solid line, and this dividing line is the guide line C.

[0224] In other words, when the twisted attachment 100 is attached to the tooth T to be treated and the second endpoint C2 is taken as the starting point, the guide line C extends towards the reference plane P1 in a direction close to the occlusal surface A2 and close to the midline Z of the dental arch to obtain the first endpoint C1, or the guide line C extends towards the reference plane P1 in a direction close to the occlusal surface A2 and away from the midline Z of the dental arch to obtain the first endpoint C1. The guide line C generally has an upward inclined trend.

[0225] In addition, the guide line C is a curve, and the guide line C is located on the side of the reference line segment D that is close to the second guide surface 132. At this time, the area of ​​the first guide surface 131 near the reference line segment D can be further increased to avoid the first positioning trajectory G1 and the second positioning trajectory G2 from contacting the second guide surface 132 when they are close to the reference line segment D.

[0226] The guide line C can be a single curvature curve, a multi-curvature curve, or a spiral. For example, if the guide line C is a wavy curve, the first guide surface 131 and the second guide surface 132 formed are also wavy surfaces.

[0227] The vertical projection of the guide line C onto the reference plane P1 is either a straight line or a curve.

[0228] The guide line C may be located in the same plane or in a different plane.

[0229] In other words, in three-dimensional space, the guide line C is a two-dimensional curve or a three-dimensional curve.

[0230] One embodiment of the present invention also provides a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the steps in the design method of the twist attachment 100 as described above.

[0231] Combination Figure 33An embodiment of the present invention also provides a design system for a torsion attachment 100. The design system includes a memory and a processor 40. The memory stores a computer program that can run on the processor. When the processor 40 executes the computer program, it implements the steps in the torsion attachment design method described above.

[0232] Processor 40 includes the following units:

[0233] The first generation unit 41 is used to generate the action surface P at the reference plane P1 according to the design quantity;

[0234] Selection unit 42 is used to select the point located at the upper edge P' of the action surface P and the point with the largest vertical distance from the reference plane P1 as the second endpoint C2;

[0235] The second generation unit 42 is used to generate the first endpoint C1 at the reference plane P1 according to the force direction of the action surface P, and the direction of the second endpoint C2 toward the first endpoint C1 matches the force direction.

[0236] The third generation unit 43 is used to extend the points of the upper edge P' of the action surface P and converge them to the first endpoint C1, thereby generating the guide surface 13 connecting the action surface P and the reference plane P1.

[0237] It should be noted that the various units in processor 40 can also perform other steps in the design method of the aforementioned twisted attachment 100, which will not be repeated here.

[0238] An embodiment of the present invention also provides a method for molding a dental orthodontic appliance 200, combined with Figure 34 The steps include:

[0239] S300: The torsion attachment 100 located in the digital model 300 of the jaw is generated according to the design method of the torsion attachment 100 described above;

[0240] S302: Generate a dental orthodontic appliance 200 with a receiving cavity S1 based on the digital model of the jawbone 300 and the torsion attachment 100. The receiving cavity S1 matches the torsion attachment 100.

[0241] Of course, the molding method also includes generating a solid torsion attachment 100, which is used in conjunction with a dental orthodontic appliance 200 to perform the orthodontic process.

[0242] In actual use, the addition position can be selected on the patient's tooth T to be treated, and the twist attachment 100 is bonded to the addition position, and then the dental orthodontic appliance 200 with the receiving cavity S1 is worn.

[0243] In summary, the torsion attachment 100 obtained by the design method of the present invention can reduce unnecessary contact and force between the receiving cavity S1 of the dental orthodontic appliance 200 and the torsion attachment 100, thereby enabling precise force on the teeth to be treated.

[0244] In addition, the guide surface 13 of the twisted attachment 100 can serve as a guide for both positioning and dislocation.

[0245] It should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This way of describing the specification is only for clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

[0246] The detailed descriptions listed above are merely specific descriptions of feasible embodiments of the present invention, and are not intended to limit the scope of protection of the present invention. All equivalent embodiments or modifications made without departing from the spirit of the present invention should be included within the scope of protection of the present invention.

Claims

1. A design method for a torsion attachment, characterized in that, Including the following steps: The working surface is generated at the reference plane according to the design quantity; The point located at the upper edge of the action surface and having the largest vertical distance from the reference plane is selected as the second endpoint; A first endpoint is generated at the reference plane according to the force direction of the action surface, and the direction of the second endpoint toward the first endpoint matches the force direction. The points extending from the upper edge of the working surface converge to the first endpoint, thereby generating a guiding surface connecting the working surface and the reference plane; The step "Generate the action surface at the reference plane based on the design quantity" specifically includes: Based on the amount of rotation and elongation, a torsional action surface and an auxiliary action surface are generated at the reference plane, respectively. The step "generating a first endpoint at the reference plane according to the force direction of the action surface, and the direction of the second endpoint toward the first endpoint matching the force direction" specifically includes: A first line segment is formed by connecting the first and last ends of the first bottom edge of the torsional surface in the reference plane; A second line segment is formed by connecting the first and last ends of the second bottom edge of the auxiliary surface in the reference plane; Obtain the diagonal of a parallelogram with the first line segment and the second line segment or their extensions as adjacent sides; A first endpoint is generated at the reference plane based on the diagonal. The first endpoint satisfies the following condition: the angle between the reference line segment passing through the first endpoint and located on the reference plane and the diagonal is not greater than 20°. The reference line segment is the vertical projection of the reference line segment between the second endpoint and the first endpoint onto the reference plane.

2. The design method according to claim 1, characterized in that, The angle between the baseline segment and the diagonal is no greater than 10°.

3. The design method according to claim 1, characterized in that, The length of the reference line segment is not less than 1 mm.

4. The design method according to claim 1, characterized in that, The step "extending the points on the upper edge of the action surface and converging them to the first endpoint" specifically includes: Select the point on the first line segment that is farthest from the second line segment as the third endpoint, and select the point on the second line segment that is farthest from the first line segment as the fourth endpoint; The second endpoint, the third endpoint, and the fourth endpoint are extended and converge to the first endpoint.

5. The design method according to claim 4, characterized in that, The step "extending the second endpoint, the third endpoint, and the fourth endpoint and converging them to the first endpoint" specifically includes: The second endpoint extends along a first preset direction until the second endpoint reaches the first endpoint, and the first preset direction simultaneously approaches the reference plane and the first endpoint; Extend the third endpoint along the second preset direction until the third endpoint reaches the first endpoint; The fourth endpoint extends along the third preset direction until the fourth endpoint reaches the first endpoint, and the first preset direction, the second preset direction, and the third preset direction are close to each other.

6. The design method according to claim 5, characterized in that, Step "Extend the third endpoint along the second preset direction until the third endpoint reaches the first endpoint; "Extending the fourth endpoint along the third preset direction until the fourth endpoint reaches the first endpoint" specifically includes: Extend the third endpoint along the second preset direction until the third endpoint reaches the first endpoint; Generate a first connecting line that connects the third endpoint and the first endpoint and is located in the reference plane. The first connecting line is a straight line, a concave curve, or a convex curve. Extend the fourth endpoint along the third preset direction until the fourth endpoint reaches the first endpoint; A second connecting line is generated that connects the fourth endpoint and the first endpoint and is located in the reference plane. The second connecting line is a straight line, an inward curve, or an outward curve.

7. The design method according to claim 1, characterized in that, The step "Generate an action surface at the reference plane according to the design quantity; select the point located at the upper edge of the action surface with the largest vertical distance from the reference plane as the second endpoint" specifically includes: A first line segment and a second line segment located in the reference plane are generated based on the rotation amount, the elongation amount, and a first relationship. The first relationship is defined as follows: the ratio of the rotation amount and the elongation amount is positively correlated with the ratio of the lengths of the first line segment and the second line segment. The torsional torque is determined based on the amount of rotation and the size of the tooth to be treated. The added height is obtained based on the torsional torque and the second relationship, which is defined as: the added height is positively correlated with the torsional torque; Obtain the second endpoint of the added height as the vertical distance from the reference plane; A torsional action surface passing through the second endpoint and the opposite ends of the first line segment is generated, and an auxiliary action surface passing through the second endpoint and the opposite ends of the second line segment is generated.

8. The design method according to claim 7, characterized in that, The range of the added height is 0.5mm-2mm.

9. The design method according to claim 1, characterized in that, The design method further includes the following steps: Identify the teeth requiring orthodontic attachments based on the digital model of the jaw; The position of the twisting attachment is determined by the addition location of the tooth to be treated; Match the reference plane and the added position.

10. The design method according to claim 9, characterized in that, The step "Identifying the teeth requiring rotation attachments on the digital model of the jaw" specifically includes: Obtain the rotation amount of each tooth when the digitized dental model changes from step K to step K+W, where K and W are positive integers; When it is determined that the rotation amount is not less than the preset value, the corresponding tooth on the digital model of the jaw in step K is defined as the tooth to be treated that needs to have a torsion attachment added.

11. The design method according to claim 9, characterized in that, The step "obtaining the addition position of the twisting attachment at the tooth to be treated" specifically includes: The torsional torque is obtained based on the amount of rotation and the size of the tooth to be treated. The position of the torsion attachment at the tooth to be treated is obtained based on the torsional torque and the third relationship. The third relationship is defined as follows: when performing mesial lingual rotation of the crown, the distance between the torsion attachment and the midline of the dentition is positively correlated with the torsion torque; when performing distal lingual rotation of the crown, the distance between the torsion attachment and the midline of the dentition is negatively correlated with the torsion torque.

12. The design method according to claim 9, characterized in that, The step "matching the reference plane and the added position" specifically includes: Obtain the rotation pattern of the teeth to be treated; The reference plane is matched to the added position according to the rotation method, wherein when the crown is rotated mesially to the lingual side, the first endpoint is closer to the midline of the dentition than the second endpoint, and when the crown is rotated distally to the lingual side, the first endpoint is closer to or farther from the midline of the dentition than the second endpoint.

13. The design method according to claim 1, characterized in that, The step "generating a guide surface connecting the working surface and the reference plane" specifically includes: The placement trajectory of a dental orthodontic appliance is obtained, the dental orthodontic appliance including a receiving cavity that matches the torsion attachment; A first guide surface is generated based on the positioning trajectory to connect the action surface and the reference plane. The first guide surface has a path trajectory that matches the positioning trajectory.

14. The design method according to claim 13, characterized in that, The step "Obtaining the placement trajectory of the orthodontic appliance" specifically includes: Obtain a first positioning trajectory formed by N1 points of the first guiding edge and a second positioning trajectory formed by N2 points of the second guiding edge. The first guiding edge is located at the gingival end of the dental orthodontic appliance and is set corresponding to the receiving cavity. The second guiding edge is located at the edge of the receiving cavity and is set close to the gingival end of the dental orthodontic appliance.

15. The design method according to claim 1, characterized in that, The step "generating a guide surface connecting the working surface and the reference plane" specifically includes: Obtain the dislocation trajectory of a dental orthodontic appliance, the dental orthodontic appliance including a receiving cavity that matches the torsion attachment; A second guide surface is generated based on the dislocation trajectory to connect the action surface and the reference plane. The second guide surface has a path trajectory that matches the dislocation trajectory.

16. The design method according to claim 15, characterized in that, The step "Obtaining the dislocation trajectory of the orthodontic appliance" specifically includes: Obtain the first dislocation trajectory formed by M1 points of the third guide edge and the second dislocation trajectory formed by M2 points of the fourth guide edge. The third guide edge is located at the edge of the receiving cavity and is set close to the gingival end of the dental orthodontic appliance. The fourth guide edge is located at the gingival end of the dental orthodontic appliance and is set corresponding to the receiving cavity.

17. The design method according to claim 1, characterized in that, The step "generating a guide surface connecting the working surface and the reference plane" specifically includes: Generate a guide line connecting the first endpoint and the second endpoint; A first guide surface and a second guide surface are generated on both sides of the guide line. A reference line segment is formed between the first endpoint and the second endpoint. The guide line is a curve and is located on the side of the reference line segment closer to the second guide surface.

18. A computer-readable storage medium having a computer program stored thereon, characterized in that, When the computer program is executed by the processor, it implements the steps in the design method of the torsion attachment as described in any one of claims 1-17.

19. A design system for a torsion attachment, characterized in that, The design system includes a memory and a processor. The memory stores a computer program that can run on the processor. When the processor executes the computer program, it implements the steps in the design method of the torsion attachment according to any one of claims 1-17.

20. A method for molding a dental orthodontic appliance, characterized in that, Including the following steps: The design method for torsion attachments according to any one of claims 1-17 generates torsion attachments located in a digital model of the jawbone; A dental orthodontic appliance with a receiving cavity is generated based on the digital model of the jaw and the torsion attachment, the receiving cavity matching the torsion attachment.

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