Design method, forming method, storage medium and system for adding position of strengthening part

Abstract

The present invention discloses a design method, a forming method, a storage medium, and a system for the position of adding a strengthening part. The design method includes the steps of: obtaining a digital dental model; calculating a reference value of the moment of inertia of a target area on the surface of the digital dental model relative to a rotation axis; determining the magnitude relationship between the reference value and a first threshold. If it is less than the first threshold, at least part of the target area is recorded as the position for adding the strengthening part. If it is not less than the first threshold, it is not recorded. The reference value of the moment of inertia of the target area on the surface of the digital dental model in the present invention can be used to characterize the moment of inertia of the corresponding area of the dental orthodontic appliance after forming relative to the rotation axis, and the moment of inertia is used to characterize the ability of the dental orthodontic appliance to resist bending. Subsequently, a convex ridge can be formed in the corresponding area of the dental orthodontic appliance to avoid deformation or fracture. In addition, the present invention directly determines the position for adding the strengthening part by calculating the moment of inertia of the target area, and the selection of the position for adding the strengthening part is more accurate and reliable.

Description

Technical Field

[0001] The present invention relates to the technical field of dental orthodontics, and particularly to a design method, a forming method, a storage medium, and a system for the addition position of a strengthening part. Background Art

[0002] During the use of a dental orthodontic appliance, an additional force needs to be applied to achieve the repeated wearing and removal of the dental orthodontic appliance. When the external force is very large, the dental orthodontic appliance may be deformed or broken, affecting the use process of the dental orthodontic appliance, or making the dental orthodontic appliance unable to achieve the orthodontic effect. Summary of the Invention

[0003] An object of the present invention is to provide a design method, a forming method, a storage medium, and a system for the addition position of a strengthening part, which can greatly simplify the addition process of the strengthening part to the digital dental model through a reasonable design method for the addition position of the strengthening part, and the formed dental orthodontic appliance has high strength to avoid deformation or breakage.

[0004] To achieve one of the above-mentioned invention objects, an embodiment of the present invention provides a design method for the addition position of a strengthening part, including the steps of:

[0005] Obtain a digital dental model;

[0006] Calculate a reference value of the moment of inertia of a target area on the surface of the digital dental model with respect to a rotation axis;

[0007] Judge the magnitude relationship between the reference value and a first threshold. If it is less than the first threshold, record at least a part of the target area as the addition position of the strengthening part; if it is not less than the first threshold, do not record.

[0008] As a further improvement of an embodiment of the present invention, the step of "calculating a reference value of the moment of inertia of a target area on the surface of the digital dental model with respect to a rotation axis" specifically includes:

[0009] Select a target line on the surface of the digital dental model;

[0010] Divide the target line into N equal parts and obtain N + 1 target points;

[0011] Obtain N + 1 target cross-sections passing through the target points and perpendicular to the target line;

[0012] Calculate the reference value of the moment of inertia of the N + 1 target cross-sections with respect to the rotation axis, where N ≥ 1.

[0013] As a further improvement of an embodiment of the present invention, the step of "obtaining N + 1 target cross-sections passing through the target points and perpendicular to the target line" specifically includes:

[0014] On the surface of the digital dental model, a reference line passing through any target point and perpendicular to the target line is formed, and the reference line has a first width;

[0015] The reference line is offset by a first offset in a direction away from the digital dental model to obtain a termination line;

[0016] The reference line and the termination line are connected to obtain a target cross-section perpendicular to the target line;

[0017] The above steps are repeated to obtain N + 1 target cross-sections.

[0018] As a further improvement of an embodiment of the present invention, the range of the first width is 0.4 mm - 20 mm, and the first offset is greater than 0.2 mm.

[0019] As a further improvement of an embodiment of the present invention, the step of "calculating the reference value of the moment of inertia of the N + 1 target cross-sections with respect to the rotation axis" specifically includes:

[0020] Calculating the reference value of the moment of inertia of the target cross-section with respect to the rotation axis according to the first width, the first offset, and the first height of each target cross-section, where the first height is the maximum height of the occlusal surface of the teeth facing the gingival line in the longitudinal section, and the longitudinal section passes through the corresponding target point and is perpendicular to the mesiodistal direction.

[0021] As a further improvement of an embodiment of the present invention, the step of "calculating the reference value of the moment of inertia of the N + 1 target cross-sections with respect to the rotation axis" specifically includes:

[0022] Calculating the reference value of the moment of inertia of the target cross-section with respect to the rotation axis according to the coordinates of all points on each target cross-section.

[0023] As a further improvement of an embodiment of the present invention, the step of "judging the magnitude relationship between the reference value and the first threshold, if it is less than, record at least part of the target area as the position for adding the strengthening part, if it is not less than, do not record" specifically includes:

[0024] Judging the magnitude relationship between the reference value of each moment of inertia and the first threshold;

[0025] If it is less than, define the corresponding target point as an adding point, if it is not less than, define the corresponding target point as a non-adding point;

[0026] Define the area formed by L consecutive adding points as a position for adding a strengthening part to form M positions for adding strengthening parts, where L ≥ 2 and M ≥ 1.

[0027] As a further improvement of an embodiment of the present invention, after the step of "defining the area formed by L consecutive addition points as an addition position of a strengthening part to form M addition positions of strengthening parts", the following steps are further included:

[0028] When M≥2, select the adjacent Kth addition position of the strengthening part and the (K + 1)th addition position of the strengthening part;

[0029] Calculate the interval distance between the Kth addition position of the strengthening part and the (K + 1)th addition position of the strengthening part;

[0030] Judge the size relationship between the interval distance and the second threshold;

[0031] If it is less than, connect the Kth addition position of the strengthening part and the (K + 1)th addition position of the strengthening part; if it is not less than, keep the Kth addition position of the strengthening part and the (K + 1)th addition position of the strengthening part disconnected from each other, where K≥1.

[0032] As a further improvement of an embodiment of the present invention, after the step of "defining the area formed by L consecutive addition points as an addition position of a strengthening part to form M addition positions of strengthening parts", the following steps are further included:

[0033] When M≥2, select the adjacent Kth addition position of the strengthening part and the (K + 1)th addition position of the strengthening part;

[0034] Calculate the number of non-addition points between the Kth addition position of the strengthening part and the (K + 1)th addition position of the strengthening part;

[0035] Judge the size relationship between the number of non-addition points and the third threshold;

[0036] If it is less than, connect the Kth addition position of the strengthening part and the (K + 1)th addition position of the strengthening part; if it is not less than, keep the Kth addition position of the strengthening part and the (K + 1)th addition position of the strengthening part disconnected from each other, where K≥1.

[0037] As a further improvement of an embodiment of the present invention, the design method further includes the steps of:

[0038] Traverse all target areas on the surface of the dental digital model and record all addition positions of the strengthening parts.

[0039] As a further improvement of an embodiment of the present invention, the extending direction of the addition position of the strengthening part is parallel to the mesiodistal direction of the dental digital model, perpendicular to the mesiodistal direction, or forms an acute angle with the mesiodistal direction.

[0040] As a further improvement of an embodiment of the present invention, the addition position of the strengthening part is located on the buccal surface, lingual surface or occlusal surface of the dental digital model.

[0041] As a further improvement of an embodiment of the present invention, the adding position of the strengthening part is set corresponding to the anterior tooth area and / or the posterior tooth area of the digital dental arch model.

[0042] As a further improvement of an embodiment of the present invention, the adding position of the strengthening part is set corresponding to at least one of the tooth surface, the adjacent tooth space or the vacuole area of the digital dental arch model.

[0043] As a further improvement of an embodiment of the present invention, in the extending direction of the adding position of the strengthening part, the adding position of the strengthening part has a first length, and the range of the first length is 0.5 mm - 150 mm.

[0044] As a further improvement of an embodiment of the present invention, the digital dental arch model includes a plurality of adding positions of the strengthening part, and the plurality of adding positions of the strengthening part are distributed at intervals or connected to each other.

[0045] As a further improvement of an embodiment of the present invention, the adding position of the strengthening part is located in the adjacent tooth space of the occlusal surface of the digital dental arch model, the adjacent tooth space connects the first occlusal surface of the adjacent first tooth and the second occlusal surface of the second tooth, and the adding position of the strengthening part includes a first end point close to the first occlusal surface and a second end point close to the second occlusal surface in its extending direction.

[0046] As a further improvement of an embodiment of the present invention, a gingival line is formed between the buccal surface or the lingual surface and the gingiva. In the direction of the buccal surface of the digital dental arch model facing the lingual surface, there is a first maximum distance between the corresponding area of the first end point and the gingival line, and there is a second maximum distance between the corresponding area of the second end point and the gingival line. The ranges of both the first maximum distance and the second maximum distance are 0.5 mm - 4 mm.

[0047] As a further improvement of an embodiment of the present invention, a gingival line is formed between the buccal surface or the lingual surface and the gingiva. In a cross-section passing through the target line and perpendicular to the direction of the buccal surface facing the lingual surface, the first occlusal surface includes a first highest point close to the second occlusal surface, the second occlusal surface includes a second highest point close to the first occlusal surface, the first highest point is farther from the gingival line than the first end point, and the second highest point is farther from the gingival line than the second end point.

[0048] As a further improvement of an embodiment of the present invention, in the direction of the occlusal surface of the digital dental model facing the gingival line, there is a first distance between the first highest point and the gingival line, a second distance between the first end point and the gingival line, a third distance between the second highest point and the gingival line, and a fourth distance between the second end point and the gingival line. The ratio of the second distance to the first distance is not less than 20%, and the ratio of the fourth distance to the third distance is not less than 20%.

[0049] As a further improvement of an embodiment of the present invention, the ratio of the second distance to the first distance is not greater than 95%, and the ratio of the fourth distance to the third distance is not greater than 95%.

[0050] As a further improvement of an embodiment of the present invention, the second distance is 40%-80% of the first distance, and the fourth distance is 40%-80% of the third distance.

[0051] To achieve one of the above-mentioned invention purposes, an embodiment of the present invention provides a design method for the addition position of a strengthening part, including the steps of:

[0052] Obtain a digital dental model;

[0053] Obtain a target area located on the surface of the digital dental model and passing through the interdental space;

[0054] Calculate the moment of inertia of the target area relative to the rotation axis and the distance between adjacent teeth;

[0055] Calculate the reference value of the function f(x, y), where x is the moment of inertia and y is the interdental space;

[0056] Judge the size of the reference value and the fourth threshold. If it is less than, record the target area as the addition position of the strengthening part. If it is not less than, do not record.

[0057] As a further improvement of an embodiment of the present invention, the step of "calculating the moment of inertia of the target area relative to the rotation axis" specifically includes:

[0058] Select a target line on the surface of the digital dental model;

[0059] Divide the target line into N equal parts and obtain N + 1 target points;

[0060] Obtain N + 1 target cross-sections passing through the target points and perpendicular to the target line;

[0061] Calculate the moment of inertia of the N + 1 target cross-sections relative to the rotation axis, where N≥1.

[0062] To achieve one of the above-mentioned invention purposes, an embodiment of the present invention provides a computer-readable storage medium, on which a computer program is stored. When the computer program is executed by a processor, the steps in the design method of the strengthening part addition position described in any one of the above technical solutions are implemented.

[0063] To achieve one of the above-mentioned invention purposes, an embodiment of the present invention provides a design system for a strengthening part. 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, the steps in the design method of the strengthening part addition position described in any one of the above technical solutions are implemented.

[0064] To achieve one of the above-mentioned invention purposes, an embodiment of the present invention provides a forming method for a dental orthodontic appliance, including the steps:

[0065] Obtain the strengthening part addition position according to the design method of the strengthening part addition position described in any one of the above technical solutions;

[0066] Generate a dental orthodontic appliance according to the strengthening part addition position and the structural information of the strengthening part.

[0067] As a further improvement of an embodiment of the present invention, the step of "generating a dental orthodontic appliance according to the strengthening part addition position and the structural information of the strengthening part" specifically includes:

[0068] Judge the magnitude relationship between the reference value and the fifth threshold value;

[0069] If it is not less than, form a strengthening part at the strengthening part addition position according to the structural information of the strengthening part, and generate a dental orthodontic appliance with a cavity according to the dental digital model and the strengthening part. The cavity matches the strengthening part;

[0070] If it is less than, generate a dental orthodontic appliance with a solid ridge according to the dental digital model and the structural information of the strengthening part. The solid ridge matches the strengthening part.

[0071] As a further improvement of an embodiment of the present invention, the step of "generating a dental orthodontic appliance with a solid ridge according to the dental digital model and the structural information of the strengthening part" specifically includes:

[0072] Form a strengthening part at the strengthening part addition position according to the structural information of the strengthening part;

[0073] Generate an appliance body with a cavity according to the dental digital model and the strengthening part. The cavity matches the strengthening part, and a filling part is arranged in the cavity to form a solid ridge. The solid ridge and the appliance body cooperate to form a dental orthodontic appliance.

[0074] As a further improvement of an embodiment of the present invention, the step of "arranging a filling part in the cavity to form a solid ridge" specifically includes:

[0075] Generating a filling part according to the added strengthening part;

[0076] Fixing the filling part in the cavity to form a solid ridge.

[0077] As a further improvement of an embodiment of the present invention, the step of "generating a dental orthodontic appliance with solid ridges according to the dental digital model and the structural information of the strengthening part" specifically includes:

[0078] Generating an appliance body according to the dental digital model, where the appliance body is provided with a marked position indicating the added position of the strengthening part, and arranging a solid ridge at the marked position to obtain a dental orthodontic appliance.

[0079] As a further improvement of an embodiment of the present invention, the step of "arranging a solid ridge at the marked position to obtain a dental orthodontic appliance" specifically includes:

[0080] Generating a solid ridge according to the added strengthening part;

[0081] Fixing the solid ridge at the marked position to obtain a dental orthodontic appliance.

[0082] As a further improvement of an embodiment of the present invention, the structural information includes the size of the strengthening part and the outer contour of the cross-section.

[0083] As a further improvement of an embodiment of the present invention, in the direction away from the dental digital model, the outer contour of the cross-section of the strengthening part is a rectangle, a trapezoid, an arc, a triangle, a polygon or an "M" shape.

[0084] Compared with the prior art, the beneficial effect of an embodiment of the present invention is that: the reference value of the moment of inertia of the target area on the surface of the dental digital model of an embodiment of the present invention relative to the rotation axis can be used to characterize the moment of inertia of the corresponding area of the dental orthodontic appliance after molding relative to the rotation axis, and the moment of inertia is used to characterize the ability of this area of the dental orthodontic appliance to resist bending. When the reference value is small, it indicates that the ability of this target area to resist bending is insufficient, and a strengthening part needs to be added to this target area. Subsequently, a ridge can be formed in the corresponding area of the dental orthodontic appliance to increase the ability to resist bending. The setting of the ridge can improve the local stiffness of the dental orthodontic appliance, thereby avoiding deformation or fracture of the dental orthodontic appliance; in addition, in this embodiment, the position for adding the strengthening part is directly determined by calculating the moment of inertia of the target area on the surface of the dental digital model relative to the rotation axis, and the selection of the position for adding the strengthening part is more accurate and reliable, and thus the ability of the finally formed dental orthodontic appliance to prevent deformation or fracture is stronger. Brief Description of the Drawings

[0085] Figure 1 is a step diagram of the design method for the position where the strengthening part is added according to an embodiment of the present invention;

[0086] Figure 2 is a schematic diagram of a digital dental model according to an embodiment of the present invention;

[0087] Figure 3 is a schematic diagram of a formed dental orthodontic appliance according to an embodiment of the present invention;

[0088] Figure 4 is a step diagram of the steps for obtaining a target cross-section and calculating a reference value of the moment of inertia with respect to the rotation axis according to an embodiment of the present invention;

[0089] Figure 5 is a step diagram of the steps for obtaining a target cross-section according to an embodiment of the present invention;

[0090] Figure 6 is a schematic diagram of obtaining a target cross-section according to an embodiment of the present invention;

[0091] Figure 7 is a step diagram of the steps for determining the position where the strengthening part is added according to an embodiment of the present invention;

[0092] Figure 8 is a schematic diagram of determining the position where the strengthening part is added according to an embodiment of the present invention;

[0093] Figure 9 is a step diagram of the processing steps between multiple positions where the strengthening part is added in a specific example of the present invention;

[0094] Figure 10 is a step diagram of the processing steps between multiple positions where the strengthening part is added in another specific example of the present invention;

[0095] Figure 11 is a cross-sectional view of the digital dental model according to an embodiment of the present invention passing through the target line and perpendicular to the buccal surface towards the lingual surface;

[0096] Figure 12 is a cross-sectional view of the digital dental model from the buccal surface towards the lingual surface according to an embodiment of the present invention, and the view passes through the first endpoint;

[0097] Figure 13 is a cross-sectional view of the digital dental model from the buccal surface towards the lingual surface according to an embodiment of the present invention, and the view passes through the second endpoint;

[0098] Figure 14 is a step diagram of the design method for the position where the strengthening part is added according to another embodiment of the present invention;

[0099] Figure 15Schematic block diagram of a processor of a design system for a reinforcement part according to an embodiment of the present invention;

[0100] Figure 16 Step diagram of a forming method of a dental orthodontic appliance according to an embodiment of the present invention;

[0101] Figure 17 Schematic diagram of a forming method of a dental orthodontic appliance according to an embodiment of the present invention;

[0102] Figure 18 Schematic diagram of a dental orthodontic appliance including a cavity according to an embodiment of the present invention;

[0103] Figure 19 Flowchart of a forming method of a dental orthodontic appliance according to a specific example of the present invention;

[0104] Figure 20 Flowchart of a forming method of a dental orthodontic appliance according to another specific example of the present invention. Detailed implementation manners

[0105] The present invention will be described in detail below in conjunction with the specific implementation manners shown in the accompanying drawings. However, these implementation manners do not limit the present invention, and any structural, methodical, or functional transformation made by those of ordinary skill in the art based on these implementation manners is included within the protection scope of the present invention.

[0106] Combined with Figure 1 and Figure 2 , an embodiment of the present invention provides a design method for the addition position of a reinforcement part, including the steps of:

[0107] S100: Obtain the digital dental model 100;

[0108] S102: Calculate the reference value T of the moment of inertia of the target area E on the surface of the digital dental model 100 relative to the rotation axis;

[0109] S104: Judge the magnitude relationship between the reference value T and the first threshold T1. If it is less than, record at least part of the target area E as the reinforcement part addition position E1. If it is not less than, do not record.

[0110] Here, "recording at least part of the target area E as the reinforcement part addition position E1" means that it can be that the entire target area E is recorded as the reinforcement part addition position E1, or part of the target area E is recorded as the reinforcement part addition position E1.

[0111] In addition, the position E1 where the strengthening part is added is the subsequent corresponding position of the strengthening part. When there are multiple positions E1 for adding the strengthening part, it is not necessary to set the strengthening part in all subsequent cases. When certain positions E1 for adding the strengthening part do not meet the addition conditions of the strengthening part (for example, it is no longer necessary to add the strengthening part, or the position E1 for adding the strengthening part is not suitable for adding the strengthening part, etc.), the strengthening part may not be added at these subsequent positions E1 for adding the strengthening part.

[0112] In this embodiment, in combination with Figure 3 , the reference value T of the moment of inertia of the target area E on the surface of the dental digital model 100 relative to the rotation axis can be used to characterize the moment of inertia of the corresponding area of the dental orthodontic appliance 200 after molding. The moment of inertia is used to characterize the ability of this area of the dental orthodontic appliance 200 to resist bending. When the reference value T is small, it indicates that the ability of the target area E to resist bending is insufficient, and it is necessary to add a strengthening part in the target area E. Subsequently, a convex ridge 20 can be formed in the corresponding area of the dental orthodontic appliance 200 to increase the ability to resist bending. The setting of the convex ridge 20 can improve the local stiffness of the dental orthodontic appliance 200, thereby avoiding deformation or fracture of the dental orthodontic appliance 200.

[0113] In addition, in this embodiment, the position E1 for adding the strengthening part is directly determined by calculating the moment of inertia of the target area E on the surface of the dental digital model 100 relative to the rotation axis. The selection of the position E1 for adding the strengthening part is more accurate and reliable, and thus the ability of the finally formed dental orthodontic appliance 200 to prevent deformation or fracture is stronger.

[0114] It should be noted that in the example of using the dental orthodontic appliance 200 for orthodontic treatment, it is usually necessary to divide the orthodontic treatment into multiple successive stages (such as 20 - 40 successive stages). Each stage corresponds to a dental orthodontic appliance 200, and the positions E1 for adding the strengthening part with different parameters can be obtained on the corresponding dental digital model 100 according to the specific requirements of different stages. The parameters include the number, position, shape, etc. of the positions E1 for adding the strengthening part.

[0115] In this embodiment, in combination with Figures 4 to 6 , step S102 specifically includes:

[0116] S102a: Select a target line L1 on the surface of the dental digital model 100;

[0117] Here, the target line L1 is a curve that fits the surface of the dental digital model 100. Taking the target line L1 located in the adjacent tooth gap C on the occlusal surface A1 of the dental digital model 100 as an example, the target line L1 extends along the mesiodistal direction of the dental digital model 100, and the adjacent tooth gap C is the area between the first occlusal surface T11 of the adjacent first tooth T1 and the second occlusal surface T21 of the second tooth T2.

[0118] S102b: Divide the target line L1 into N equal parts and obtain N + 1 target points P. Of course, the distribution of the target points P can also be adjusted according to the actual situation.

[0119] S102c: Obtain N + 1 target cross-sections B that pass through the target points P and are perpendicular to the target line L1;

[0120] Specifically, step S102c includes:

[0121] S1021c: Form a reference line L2 on the surface of the dental digital model 100 that passes through any target point P and is perpendicular to the target line L1. The reference line L2 has a first width;

[0122] Here, considering that both the target line L1 and the reference line L2 are curves and it is difficult to make the entire target line L1 perpendicular to the entire reference line L2, the "reference line L2 perpendicular to the target line L1" means that a small section of the target line L1 passing through the target point P and a small section of the reference line L2 are perpendicular to each other. The first width is the width of the reference line L2 in the direction from the buccal surface A2 towards the lingual surface A3, and the range of the first width is 0.4 mm - 20 mm.

[0123] S1022c: Offset the reference line L2 in a direction away from the dental digital model 100 by a first offset L3 to obtain a termination line L4;

[0124] S1023c: Connect the reference line L2 and the termination line L4 to obtain a target cross-section B perpendicular to the target line L1;

[0125] Here, a gingival line A4 is formed between the buccal surface A2 or the lingual surface A3 and the gingiva. The "direction away from the dental digital model 100" means the direction from the gingival line A4 of the dental digital model 100 towards the occlusal surface A1. The termination line L4 is a curve with the same shape as the reference line L2, and the distance between the corresponding points of the termination line L4 and the reference line L2 is the first offset L3.

[0126] "Connect the reference line L2 and the termination line L4" means connecting one end of the reference line L2 to one end of the termination line L4 and connecting the other end of the reference line L2 to the other end of the termination line L4. The obtained target cross-section B is perpendicular to a small section of the target line L1 connecting the target point P.

[0127] It should be noted that the first offset L3 is greater than 0.2 mm. The first offset L3 roughly corresponds to the thickness of the formed dental orthodontic appliance 200, and the target cross-section B roughly corresponds to the longitudinal section of the dental orthodontic appliance 200. The section direction of this longitudinal section is from the gingival line A4 towards the occlusal surface A1, and the points passed by this longitudinal section correspond to the target points P. Therefore, the moment of inertia of the target cross-section B with respect to the rotation axis can be used to characterize the moment of inertia of the corresponding area of the dental orthodontic appliance 200 with respect to the rotation axis.

[0128] S1024c: Repeat the above steps S1021c to S1023c to obtain N + 1 target cross-sections B.

[0129] Here, since the target line L1 is a curve, at least some of the target cross-sections B are not parallel, and different target cross-sections B can be obtained by equally dividing the target line L1 into N parts.

[0130] Of course, in other embodiments, the target cross-section B can also be obtained by other means.

[0131] S102d: Calculate the reference value T of the moment of inertia of the N + 1 target cross-sections B with respect to the rotation axis, where N ≥ 1.

[0132] In a specific example, step S102d specifically includes:

[0133] Calculate the reference value T of the moment of inertia of the target cross-section B with respect to the rotation axis according to the first width, the first offset L3, and the first height h of each target cross-section B, where the first height h is the maximum height of the occlusal surface A1 of the tooth in the longitudinal section facing the gingival line A4, and the longitudinal section passes through the corresponding target point P and is perpendicular to the mesiodistal direction.

[0134] In another specific example, step S102d specifically includes:

[0135] Calculate the reference value T of the moment of inertia of the target cross-section B with respect to the rotation axis according to the coordinates of all points on each target cross-section B.

[0136] Here, all points on the target cross-section B have corresponding coordinate points (x, y, z) in the global coordinate system. At this time, without obtaining the first width and the first offset L3 of the target cross-section B, the reference value T of the moment of inertia of the target cross-section B with respect to the rotation axis can be directly calculated according to the coordinates of all points on the target cross-section B.

[0137] In this embodiment, in combination with Figure 7 and Figure 8 , step S104 specifically includes:

[0138] S104a: Judge the magnitude relationship between the reference value T of each moment of inertia and the first threshold T1;

[0139] S104b: If it is less than, define the corresponding target point P as an addition point (refer to the dot in Figure 8 ), and if it is not less than, define the corresponding target point P as a non-addition point (refer to the triangular point in Figure 8 );

[0140] S104c: Define the area formed by L consecutive addition points as a reinforcement addition position E1, thereby forming M reinforcement addition positions E1, where L≥2 and M≥1.

[0141] Here, the "area formed by L consecutive addition points" means that the target points P at both ends of this area are non-addition points or there are no target points P. It can be understood that on a target line L1, one or more reinforcement addition positions E1 can be included.

[0142] In a specific example, combined with Figure 9 , after step S104c, it further includes:

[0143] S104d: When M≥2, select the adjacent Kth reinforcement addition position E1 and the (K + 1)th reinforcement addition position E1;

[0144] Here, according to the aforementioned definition, the Kth reinforcement addition position E1 and the (K + 1)th reinforcement addition position E1 at this time are disconnected from each other.

[0145] S104e: Calculate the interval distance between the Kth reinforcement addition position E1 and the (K + 1)th reinforcement addition position E1;

[0146] Here, the Kth reinforcement addition position E1 has a terminal target point P close to the (K + 1)th reinforcement addition position E1, and the (K + 1)th reinforcement addition position E1 has a start-end target point P close to the Kth reinforcement addition position E1. The length of the target line L1 between the terminal target point P and the start-end target point P is the interval distance between the Kth reinforcement addition position E1 and the (K + 1)th reinforcement addition position E1.

[0147] S104f: Judge the size relationship between the interval distance and the second threshold T2;

[0148] S104g: If it is less than, connect the Kth reinforcement addition position E1 and the (K + 1)th reinforcement addition position E1; if it is not less than, keep the Kth reinforcement addition position E1 and the (K + 1)th reinforcement addition position E1 disconnected from each other, where K≥1.

[0149] Here, if it is less than, it indicates that the length of the region of non-added points between the Kth reinforcement addition position E1 and the (K + 1)th reinforcement addition position E1 is short, and these non-added points can be ignored and the Kth reinforcement addition position E1 and the (K + 1)th reinforcement addition position E1 can be directly connected to form an entire reinforcement addition position E1; if it is greater than, it indicates that the length of the region of non-added points between the Kth reinforcement addition position E1 and the (K + 1)th reinforcement addition position E1 is long, and the non-added points cannot be ignored. At this time, no processing is performed on the Kth reinforcement addition position E1 and the (K + 1)th reinforcement addition position E1.

[0150] In another specific example, in combination with Figure 10 , after step S104c, it further includes:

[0151] S104d’: When M≥2, select the adjacent Kth reinforcement addition position E1 and the (K + 1)th reinforcement addition position E1;

[0152] S104e’: Calculate the number of non-added points between the Kth reinforcement addition position E1 and the (K + 1)th reinforcement addition position E1;

[0153] S104f’: Determine the size relationship between the number of non-added points and the third threshold T3;

[0154] S104g’: If it is less than, connect the Kth reinforcement addition position E1 and the (K + 1)th reinforcement addition position E1; if it is not less than, keep the Kth reinforcement addition position E1 and the (K + 1)th reinforcement addition position E1 disconnected from each other, where K≥1.

[0155] The difference between this specific example and the previous specific example is that: in this specific example, the number of non-added points between the Kth reinforcement addition position E1 and the (K + 1)th reinforcement addition position E1 is calculated to connect the two reinforcement addition positions E1 or keep the two reinforcement addition positions E1 disconnected from each other. Other descriptions of this specific example can refer to the previous specific example and will not be elaborated here.

[0156] In this embodiment, after step S104, it further includes:

[0157] Traverse all target regions E on the surface of the dental digital model 100 and record all reinforcement addition positions E1.

[0158] That is to say, repeat steps S100 to S104 to obtain all reinforcement addition positions E1 on the surface of the dental digital model 100.

[0159] In this embodiment, in combination with Figure 11, the strengthening part adding position E1 obtained according to the design method of the aforementioned strengthening part adding position E1 includes a first end point E11 close to the first occlusal surface T11 and a second end point E12 close to the second occlusal surface T21 in its extending direction.

[0160] The first end point E11 is arranged close to or centered on the buccal surface A2 and the lingual surface A3 of the dental digital model 100, and the second end point E12 is arranged close to or centered on the buccal surface A2 and the lingual surface A3 of the dental digital model 100.

[0161] Here, when the first end point E11 and the second end point E12 are both arranged close to the buccal surface A2 of the dental digital model 100, or both arranged close to the lingual surface A3 of the dental digital model 100, or both arranged in the center, the extending direction of the strengthening part adding position E1 is parallel to the mesiodistal direction. Of course, there may also be a small included angle with the mesiodistal direction.

[0162] When one of the first end point E11 and the second end point E12 is arranged close to the buccal surface A2 of the dental digital model 100 and the other is arranged close to the lingual surface A3 of the dental digital model 100, the strengthening part adding position E1 is inclined, and the included angle formed between the extending direction of the strengthening part adding position E1 and the mesiodistal direction is an acute angle.

[0163] In this embodiment, on the section passing through the target line L1 and perpendicular to the direction from the buccal surface A2 towards the lingual surface A3, the first occlusal surface T11 includes a first highest point G1 close to the second occlusal surface T21, the second occlusal surface T21 includes a second highest point G2 close to the first occlusal surface T11, the first highest point G1 is farther from the gingival line A4 than the first end point E11, and the second highest point G2 is farther from the gingival line A4 than the second end point E12.

[0164] At this time, the height of the ridge 20 formed on the dental orthodontic appliance 200 subsequently can be effectively controlled, avoiding contact with the ridge 20 when the opposing jaw contacts the dental orthodontic appliance 200, and further avoiding the ridge 20 affecting the normal occlusal process.

[0165] Here, taking the section passing through the cusp points of the first tooth T1 and the second tooth T2 as an example, the first highest point G1 corresponds to the cusp R1 of the first tooth T1 close to the second tooth T2, and the second highest point G2 corresponds to the cusp R2 of the second tooth T2 close to the first tooth T1.

[0166] Specifically, in the direction from the occlusal surface A1 of the dental digital model 100 towards the gingival line A4 (i.e., the substantially vertical direction), there is a first distance H1 between the first highest point G1 and the gingival line A4, a second distance H2 between the first end point E11 and the gingival line A4, a third distance H3 between the second highest point G2 and the gingival line A4, and a fourth distance H4 between the second end point E12 and the gingival line A4. The ratio of the second distance H2 to the first distance H1 is not less than 20%, and the ratio of the fourth distance H4 to the third distance H3 is not less than 20%.

[0167] In addition, the ratio of the second distance H2 to the first distance H1 is not greater than 95%, and the ratio of the fourth distance H4 to the third distance H3 is not greater than 95%.

[0168] Optionally, the second distance H2 is 40%-80% of the first distance H1, and the fourth distance H4 is 40%-80% of the third distance H3.

[0169] In this embodiment, in combination with Figure 12 and Figure 13 , a gingival line A4 is formed between the buccal surface A2 or the lingual surface A3 and the gingiva. In the direction from the buccal surface A2 of the dental digital model 100 towards the lingual surface A3, there is a first maximum spacing W1 between the first end point E11 and the corresponding area of the gingival line A4, and a second maximum spacing W2 between the second end point E12 and the corresponding area of the gingival line A4. The ranges of both the first maximum spacing W1 and the second maximum spacing W2 are 0.5 mm - 4 mm.

[0170] Here, the "corresponding area of the gingival line A4" refers to the area of the gingival line A4 connecting the teeth to be orthodontically treated with the convex ridge 20.

[0171] Optionally, the ranges of both the first maximum spacing W1 and the second maximum spacing W2 are 1 mm - 2.5 mm.

[0172] The first spacing W1 and the second spacing W2 are the spacings in the direction from the buccal surface A2 towards the lingual surface A3. By setting reasonable first and second spacings W1 and W2, the wrapping property of the subsequent formed dental orthodontic appliance 200 for the teeth to be orthodontically treated can be improved.

[0173] In other embodiments, in addition to being located on the occlusal surface A1 of the dental digital model 100, the strengthening part adding position E1 can also be located on the buccal surface A2 or the lingual surface A3 of the dental digital model 100.

[0174] The strengthening part adding position E1 is set corresponding to the anterior tooth area and / or the posterior tooth area of the dental digital model 100.

[0175] The strengthening part adding position E1 is set corresponding to at least one of the tooth surface, the adjacent tooth space, or the void area of the dental digital model 100.

[0176] Here, "at least one of them" means that one strengthening part adding position E1 can cover one or more regions among the tooth surface, the interdental space or the vacuole area of the dental digital model 100 at the same time.

[0177] The strengthening part adding position E1 can have multiple extending directions. For example, the extending direction of the strengthening part adding position E1 is parallel to the mesiodistal direction, or the extending direction of the strengthening part adding position E1 is perpendicular to the mesiodistal direction, or the included angle formed between the extending direction of the strengthening part adding position E1 and the mesiodistal direction is an acute angle, and the strengthening part adding position E1 is linear or curved.

[0178] In addition, in the extending direction of the strengthening part adding position E1, the strengthening part adding position E1 has a first length, and the range of the first length is 0.5 mm - 150 mm.

[0179] The dental digital model 100 includes a plurality of strengthening part adding positions E1, and the plurality of strengthening part adding positions E1 are spaced apart or connected to each other.

[0180] In another embodiment of the present invention, in combination Figure 14 , the design method of the strengthening part adding position includes the steps:

[0181] S200: Obtain the dental digital model 100';

[0182] S202: Obtain the target area E located on the surface of the dental digital model 100' and passing through the interdental space C;

[0183] Here, taking the target area E located in the interdental space C on the occlusal surface A1 of the dental digital model 100' as an example, but not limited thereto, the interdental space C in this embodiment may also be located on the buccal surface A2 or the lingual surface A3.

[0184] S204: Calculate the moment of inertia of the target area E relative to the rotation axis and the distance between adjacent teeth;

[0185] S206: Calculate the reference value T' of the function f(x, y), where x is the moment of inertia and y is the distance between adjacent teeth;

[0186] Here, the function f(x, y) is a function related to the parameters x and y, that is, both x and y affect the reference value T', and the "distance between adjacent teeth" is the width of the gap between two teeth.

[0187] S208: Judge the magnitude relationship between the reference value T' and the fourth threshold value T4. If it is less than, record the target area E as the strengthening part adding position E1. If it is not less than, do not record.

[0188] It can be seen that the difference between this embodiment and the previous embodiment is that the reference value T' in this embodiment is the value of the function f(x, y). That is, the reference value T' is affected not only by the moment of inertia but also by the distance between adjacent teeth. By considering multiple parameters (i.e., the moment of inertia and the distance between adjacent teeth), the accuracy and reliability of the position E1 for adding the strengthening part can be improved, and further the ability of the finally formed dental orthodontic appliance 200 to prevent deformation or fracture can be improved.

[0189] For other descriptions of this embodiment, reference can be made to the previous embodiment, such as the acquisition of the moment of inertia, the acquisition of the position E1 for adding the strengthening part, etc., which will not be elaborated here.

[0190] An embodiment of the present invention also provides a computer-readable storage medium, on which a computer program is stored. When the computer program is executed by a processor, the steps in the design method of the position for adding the strengthening part as described above are implemented.

[0191] Combined with Figure 15 , an embodiment of the present invention also provides a design system 400 for the strengthening part. The design system 400 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, the steps in the design method of the position for adding the strengthening part as described above are implemented.

[0192] Here, in combination with the description of the design method of the position for adding the strengthening part in the previous embodiment, the processor 40 includes the following units:

[0193] An acquisition unit 41, configured to acquire the digital dental model 100;

[0194] A calculation unit 42, configured to calculate the reference value T of the moment of inertia of the target area E on the surface of the digital dental model 100 relative to the rotation axis;

[0195] A processing unit 43, configured to judge the magnitude relationship between the reference value T and the first threshold T1. If it is less than, at least part of the area of the target area E is recorded as the position E1 for adding the strengthening part. If it is not less than, it is not recorded.

[0196] In other embodiments, in combination with the description of the design method of the position for adding the strengthening part in another previous embodiment, each unit in the processor 40 may also be used to execute the following steps:

[0197] The acquisition unit 41 is used to acquire the digital dental model 100', and acquire the target area E located on the surface of the digital dental model 100' and passing through the adjacent tooth gap C;

[0198] The calculation unit 42 is used to calculate the moment of inertia of the target area E relative to the rotation axis and the spacing between adjacent teeth, and calculate the reference value T' of the function f(x, y), where x is the moment of inertia and y is the spacing between adjacent teeth;

[0199] The processing unit 43 is used to judge the magnitude relationship between the reference value T' and the fourth threshold value T4. If it is less than, the target area E is recorded as the position E1 for adding the strengthening part. If it is not less than, it is not recorded.

[0200] It should be noted that each unit of the processor 40 can also be used to execute other steps in the foregoing design method. For details, reference can be made to the foregoing description and will not be elaborated here.

[0201] An embodiment of the present invention also provides a forming method for a dental orthodontic appliance. Here, taking the strengthening part 300 located on the occlusal surface A1 as an example for illustration.

[0202] Combined with Figures 16 to 18 , the forming method includes the steps:

[0203] S300: Obtain the position E1 for adding the strengthening part according to the design method of the position for adding the strengthening part as described above;

[0204] S302: Generate a dental orthodontic appliance 200 according to the position E1 for adding the strengthening part and the structural information of the strengthening part 300.

[0205] Here, the structural information of the strengthening part 300 includes the size of the strengthening part 300, the outer contour of the cross-section, etc. After having the position E1 for adding the strengthening part and the structural information of the strengthening part 300, the dental orthodontic appliance 200 can be produced by a suitable processing method.

[0206] Here, on the direction from the buccal surface A2 to the lingual surface A3 of the dental digital model, the outer contour of the cross-section of the strengthening part 300 is rectangular, trapezoidal, arc-shaped, triangular, polygonal or "M"-shaped.

[0207] Here, the outer contour refers to the outer contour of a single convex ridge 10, and the "M"-shaped means that there is one or more depressions in the outer contour, and the degree of the depression is not limited.

[0208] Combined with Figures 18 to 20 , step S302 specifically includes:

[0209] Judge the magnitude relationship between the reference value T (or the reference value T') and the fifth threshold value T5;

[0210] If it is not less than, form the strengthening part 300 at the position E1 for adding the strengthening part according to the structural information of the strengthening part 300, and generate a dental orthodontic appliance 200 with a cavity S according to the dental digital model 100 and the strengthening part 300, and the cavity S matches the strengthening part 300;

[0211] If it is less than, a dental orthodontic appliance 200 with a solid ridge 20 is generated according to the structural information of the dental digital model 100 and the reinforcing portion 300, and the solid ridge 20 matches the reinforcing portion 300.

[0212] Here, when the reference value T is large, combined with Figure 18 , the cavity S can be directly used as the hollow ridge 20, and the cavity S is sufficient to increase the local strength of the dental orthodontic appliance 200, thereby improving the ability of the dental orthodontic appliance 200 to resist bending.

[0213] When the reference value T is small, combined with Figure 19 and Figure 20 , it is necessary to use the solid ridge 20 to assist in increasing the local strength of the dental orthodontic appliance 200, thereby ensuring that the dental orthodontic appliance 200 has a strong enough ability to resist bending.

[0214] In a specific example, combined with Figure 19 , the step of "generating a dental orthodontic appliance 200 with a solid ridge 20 according to the structural information of the dental digital model 100 and the reinforcing portion 300" specifically includes:

[0215] Form the reinforcing portion 300 at the reinforcing portion adding position E1 according to the structural information of the reinforcing portion 300;

[0216] Generate an appliance body 201 with a cavity S according to the dental digital model 100 and the reinforcing portion 300. The cavity S matches the reinforcing portion 300, and a filling portion 202 is arranged in the cavity S to form a solid ridge 20. The solid ridge 20 and the appliance body 201 cooperate to form a dental orthodontic appliance 200.

[0217] Among them, the step of "arranging a filling portion 202 in the cavity S to form a solid ridge 20" specifically includes:

[0218] Generate the filling portion 202 according to the added reinforcing portion 300;

[0219] Fix the filling portion 202 in the cavity S to form a solid ridge 20.

[0220] That is to say, the filling portion 202 is a preformed filling portion 202, and the outer contour of the filling portion 202 close to the cavity S matches the inner wall of the cavity S. The filling portion 202 and the cavity S can cooperate to form a solid ridge 20.

[0221] Of course, the filling portion 202 is also directly formed in the cavity S through a filling and curing process.

[0222] In another specific example, combined with Figure 20, the step of "generating the dental orthodontic appliance 200 with the solid ridge 20 according to the structural information of the dental digital model 100 and the reinforcing part 300" specifically includes:

[0223] Generating the appliance body 201' according to the dental digital model 100'. A marked position E1' indicating the adding position E1 of the reinforcing part is provided on the appliance body 201', and a solid ridge 20' is set at the marked position E1' to obtain the dental orthodontic appliance 200'.

[0224] Among them, the step of "setting the solid ridge 20' at the marked position E1' to obtain the dental orthodontic appliance 200'" specifically includes:

[0225] Generating the solid ridge 20' according to the added reinforcing part 300';

[0226] Fixing the solid ridge 20' at the marked position E1' to obtain the dental orthodontic appliance 200'.

[0227] That is to say, the solid ridge 20' is a preformed solid ridge 20'. The marked position E1' is located on the outer surface of the appliance body 201', and the solid ridge 20' can be directly fixed at the marked position E1' to form the dental orthodontic appliance 200'.

[0228] Of course, the solid ridge 20' can also be directly formed at the marked position E1' through a coating and curing process.

[0229] In this embodiment, taking the finally formed dental orthodontic appliance 200 as an example, corresponding to various specific designs of the adding position E1 of the reinforcing part in the design method of the foregoing reinforcing part adding position, the ridge 20 (including the cavity S, the solid ridges 20, 20') also has various specific designs.

[0230] For example, the ridge 20 is arranged corresponding to the anterior tooth area and / or the posterior tooth area of the teeth to be corrected. The ridge 20 is located on the buccal surface A2, the lingual surface A3 or the occlusal surface A1 of the appliance body 201. The ridge 20 is arranged corresponding to at least one of the tooth surface of the teeth to be corrected, the adjacent tooth space or the void area.

[0231] Here, the "tooth surface" refers to the surface close to the buccal surface, the surface close to the lingual surface or the occlusal surface of each tooth to be corrected. The "adjacent tooth space" refers to the area between two adjacent teeth to be corrected. The "void area" refers to the extraction area or the area with a large gap. The "at least one of them" means that one ridge 20 can simultaneously cover one or more areas among the tooth surface of the teeth to be corrected, the adjacent tooth space or the void area.

[0232] It should be noted that the adjacent tooth space specifically refers to the side of the first tooth T1 close to the second tooth T2 and the side of the second tooth T2 close to the first tooth T1. When there is a relatively large gap between the first tooth T1 and the second tooth T2, the adjacent tooth space P does not include this gap, and this gap can be defined as a void area.

[0233] The convex ridge 20 can have various extending directions. For example, the extending direction of the convex ridge 20 is parallel to the mesiodistal direction, or the extending direction of the convex ridge 20 is perpendicular to the mesiodistal direction, or the included angle formed between the extending direction of the convex ridge 20 and the mesiodistal direction is an acute angle, and the convex ridge 20 is linear or curved.

[0234] The dental orthodontic appliance 200 can include one convex ridge 20 or multiple convex ridges 20 located on the appliance body 201.

[0235] When there are multiple convex ridges 20, the multiple convex ridges 20 are distributed at intervals, or the multiple convex ridges 20 are connected to each other.

[0236] In this embodiment, the appliance body 201 encloses to form a cavity S'. By providing a convex ridge 20 on the appliance body 201 that protrudes away from the cavity S', the moment of inertia of the entire dental orthodontic appliance 200 relative to the rotation axis can be increased. This moment of inertia can improve the ability of the dental orthodontic appliance 200 to resist bending in the direction away from the cavity S', and the direction away from the cavity S' is the main force application direction when the dental orthodontic appliance 200 is removed. That is, the setting of the convex ridge 20 can improve the local stiffness of the orthodontic appliance 200, thereby avoiding deformation or fracture of the dental orthodontic appliance 200.

[0237] In addition, the dental orthodontic appliance 200 of this embodiment directly includes the convex ridge 20. The patient can directly wear the dental orthodontic appliance 200 to achieve the above effects, which is convenient to use and provides a better user experience.

[0238] It should be understood that although this specification is described according to embodiments, not every embodiment only contains an independent technical solution. This narrative way of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and 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.

[0239] The series of detailed descriptions listed above are only specific descriptions of the feasible embodiments of the present invention, and they are not intended to limit the protection scope of the present invention. Any equivalent embodiments or changes made without departing from the technical spirit of the present invention should be included in the protection scope of the present invention.

Claims

1. A design method for the addition position of a strengthening part, characterized in that, Including the steps: Obtain a digital dental model; Calculate the reference value of the moment of inertia of the target area on the surface of the digital dental model relative to the rotation axis; Judge the magnitude relationship between the reference value and the first threshold. If it is less than the first threshold, record at least part of the target area as the position for adding a strengthening part; if it is not less than the first threshold, do not record; The step of "calculating the reference value of the moment of inertia of the target area on the surface of the digital dental model relative to the rotation axis" specifically includes: Select a target line on the surface of the digital dental model; Divide the target line into N equal parts and obtain N + 1 target points; On the surface of the digital dental model, form a reference line passing through any one of the target points and perpendicular to the target line. The reference line has a first width; Offset the reference line in a direction away from the digital dental model by a first offset amount to obtain a termination line; Connect the reference line and the termination line to obtain a target cross-section perpendicular to the target line; Repeat the above steps to obtain N + 1 target cross-sections; Calculate the reference value of the moment of inertia of the target cross-section relative to the rotation axis according to the first width, the first offset amount, and the first height of each target cross-section, where the first height is the maximum height of the occlusal surface of the teeth facing the gingival line in the longitudinal section, and the longitudinal section passes through the corresponding target point and is perpendicular to the mesiodistal direction.

2. The design method according to claim 1, characterized in that, The range of the first width is 0.4 mm - 20 mm, and the first offset amount is greater than 0.2 mm.

3. The design method according to claim 1, characterized in that, The step of "calculating the reference value of the moment of inertia of N + 1 target cross-sections relative to the rotation axis" specifically includes: Calculate the reference value of the moment of inertia of the target cross-section relative to the rotation axis according to the coordinates of all points on each target cross-section.

4. The design method according to claim 1, characterized in that, The step of "judging the magnitude relationship between the reference value and the first threshold. If it is less than the first threshold, record at least part of the target area as the position for adding a strengthening part; if it is not less than the first threshold, do not record" specifically includes: Judge the magnitude relationship between the reference value of each moment of inertia and the first threshold; If it is less than the first threshold, define the corresponding target point as an adding point; if it is not less than the first threshold, define the corresponding target point as a non-adding point; Define the area formed by L consecutive adding points as a position for adding a strengthening part to form M positions for adding strengthening parts, where L ≥ 2 and M ≥ 1.

5. The design method according to claim 4, characterized in that, After the step of "defining the area formed by L consecutive adding points as a position for adding a strengthening part to form M positions for adding strengthening parts", it further includes: When M ≥ 2, select the adjacent Kth position for adding a strengthening part and the (K + 1)th position for adding a strengthening part; Calculate the distance between the Kth position for adding a strengthening part and the (K + 1)th position for adding a strengthening part; Judge the magnitude relationship between the distance and the second threshold; If it is less than the second threshold, connect the Kth position for adding a strengthening part and the (K + 1)th position for adding a strengthening part; if it is not less than the second threshold, keep the Kth position for adding a strengthening part and the (K + 1)th position for adding a strengthening part disconnected from each other, where K ≥ 1.

6. The design method according to claim 4, characterized in that, After the step of "defining the area formed by L consecutive adding points as a position for adding a strengthening part to form M positions for adding strengthening parts", it further includes: When M ≥ 2, select the adjacent Kth position for adding a strengthening part and the (K + 1)th position for adding a strengthening part; Calculate the number of non-added points between the addition position of the Kth strengthening part and the addition position of the (K + 1)th strengthening part; Judge the magnitude relationship between the number of the non-added points and a third threshold; If it is less than the third threshold, connect the addition position of the Kth strengthening part and the addition position of the (K + 1)th strengthening part; if it is not less than the third threshold, keep the addition position of the Kth strengthening part and the addition position of the (K + 1)th strengthening part disconnected from each other, where K≥1.

7. The design method according to claim 1, characterized in that, The design method further includes the steps of: Traverse all target areas on the surface of the dental digital model and record all addition positions of the strengthening parts.

8. The design method according to claim 1, characterized in that,The extending direction of the addition position of the strengthening part is parallel to the mesiodistal direction of the dental digital model, perpendicular to the mesiodistal direction, or forms an acute angle with the mesiodistal direction.

9. The design method according to claim 1, wherein The addition position of the strengthening part is located on the buccal surface, lingual surface or occlusal surface of the dental digital model.

10. The design method according to claim 1, wherein The addition position of the strengthening part is set corresponding to the anterior tooth area and / or posterior tooth area of the dental digital model.

11. The design method according to claim 1, wherein The addition position of the strengthening part is set corresponding to at least one of the tooth surface, adjacent tooth gap or vacuole area of the dental digital model.

12. The design method according to claim 1, wherein In the extending direction of the addition position of the strengthening part, the addition position of the strengthening part has a first length, and the range of the first length is 0.5 mm - 150 mm.

13. The design method according to claim 1, wherein The dental digital model includes a plurality of addition positions of the strengthening parts, and the plurality of addition positions of the strengthening parts are distributed at intervals or connected to each other.

14. The design method according to claim 1, wherein The addition position of the strengthening part is located in the adjacent tooth gap on the occlusal surface of the dental digital model, and the adjacent tooth gap connects the first occlusal surface of the adjacent first tooth and the second occlusal surface of the second tooth. The addition position of the strengthening part includes a first end point close to the first occlusal surface and a second end point close to the second occlusal surface in its extending direction.

15. The design method according to claim 14, wherein A gingival line is formed between the buccal surface or lingual surface and the gingiva. In the direction from the buccal surface to the lingual surface of the dental digital model, there is a first maximum distance between the first end point and the corresponding area of the gingival line, and there is a second maximum distance between the second end point and the corresponding area of the gingival line. The ranges of both the first maximum distance and the second maximum distance are 0.5 mm - 4 mm.

16. The design method according to claim 14, wherein A gingival line is formed between the buccal surface or lingual surface and the gingiva. On the cross-section passing through the target line and perpendicular to the direction from the buccal surface to the lingual surface, the first occlusal surface includes a first highest point close to the second occlusal surface, and the second occlusal surface includes a second highest point close to the first occlusal surface. The first highest point is farther from the gingival line than the first end point, and the second highest point is farther from the gingival line than the second end point.

17. The design method according to claim 16, wherein In the direction from the occlusal surface of the dental digital model to the gingival line, there is a first distance between the first highest point and the gingival line, a second distance between the first end point and the gingival line, a third distance between the second highest point and the gingival line, and a fourth distance between the second end point and the gingival line. The ratio of the second distance to the first distance is not less than 20%, and the ratio of the fourth distance to the third distance is not less than 20%.

18. The design method according to claim 17, wherein The ratio of the second distance to the first distance is not greater than 95%, and the ratio of the fourth distance to the third distance is not greater than 95%.

19. The design method according to claim 17, wherein The second distance is 40%-80% of the first distance, and the fourth distance is 40%-80% of the third distance.

20. A design method for the position where a reinforcing part is added, wherein Including the steps of: Obtaining a digital dental model; Obtaining a target area located on the surface of the digital dental model and passing through the interdental space; Calculating the moment of inertia of the target area relative to the rotation axis and the distance between adjacent teeth; Calculating the reference value of the function f(x, y), where x is the moment of inertia and y is the interdental space; Judging the magnitude relationship between the reference value and the fourth threshold. If it is less than the fourth threshold, record the target area as the position for adding the reinforcement part. If it is not less than the fourth threshold, do not record.

21. The design method according to claim 20, wherein The step of "calculating the moment of inertia of the target area relative to the rotation axis" specifically includes: Selecting a target line on the surface of the digital dental model; Dividing the target line into N equal parts and obtaining N + 1 target points; Obtaining N + 1 target cross-sections passing through the target points and perpendicular to the target line; Calculating the moment of inertia of the N + 1 target cross-sections relative to the rotation axis, where N≥1.

22. A computer-readable storage medium, on which a computer program is stored, wherein When the computer program is executed by the processor, it implements the steps in the design method for the position of adding the reinforcement part described in any one of claims 1-21.

23. A design system for a reinforcing part, whereinThe 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 the position of adding the reinforcement part described in any one of claims 1-21.

24. A forming method of a dental orthodontic appliance, characterized in that, Including the steps of: Obtaining the position for adding the reinforcement part according to the design method for the position of adding the reinforcement part described in any one of claims 1-21; Generating a dental orthodontic appliance according to the position for adding the reinforcement part and the structural information of the reinforcement part.

25. The forming method according to claim 24, characterized in that, The step of "generating a dental orthodontic appliance according to the position for adding the reinforcement part and the structural information of the reinforcement part" specifically includes: Judging the magnitude relationship between the reference value and the fifth threshold; If it is not less than the fifth threshold, form a reinforcement part at the position for adding the reinforcement part according to the structural information of the reinforcement part, and generate a dental orthodontic appliance with a cavity according to the digital dental model and the reinforcement part. The cavity matches the reinforcement part; If it is less than the fifth threshold, generate a dental orthodontic appliance with a solid ridge according to the digital dental model and the structural information of the reinforcement part. The solid ridge matches the reinforcement part.

26. The forming method according to claim 25, characterized in that, The step of "generating a dental orthodontic appliance with a solid ridge according to the digital dental model and the structural information of the reinforcement part" specifically includes: Forming a reinforcement part at the position for adding the reinforcement part according to the structural information of the reinforcement part; Generating an appliance body with a cavity according to the digital dental model and the reinforcement part. The cavity matches the reinforcement part, and a filling part is arranged in the cavity to form a solid ridge. The solid ridge and the appliance body cooperate to form a dental orthodontic appliance.

27. The forming method according to claim 26, characterized in that, The step of "arranging a filling part in the cavity to form a solid ridge" specifically includes: Generating a filling part according to the added reinforcement part; Fixing the filling part in the cavity to form a solid ridge.

28. The forming method according to claim 25, characterized in that, The step of "generating a dental orthodontic appliance with a solid ridge according to the digital dental model and the structural information of the reinforcement part" specifically includes: An orthodontic appliance body is generated according to a digital dental model. Marking positions indicating the addition positions of the strengthening parts are provided on the orthodontic appliance body, and solid ridges are arranged at the marking positions to obtain a dental orthodontic appliance.

29. The forming method according to claim 28, characterized in that, The step of "arranging solid ridges at the marking positions to obtain a dental orthodontic appliance" specifically includes: Generating solid ridges according to the added strengthening parts; Fixing the solid ridges at the marking positions to obtain a dental orthodontic appliance.

30. The forming method according to claim 24, characterized in that, The structural information includes the size of the strengthening part and the outer contour of the cross-section.

31. The forming method according to claim 30, characterized in that, In the direction away from the digital dental model, the outer contour of the cross-section of the strengthening part is rectangular, trapezoidal, arc-shaped, triangular, polygonal or "M"-shaped.

Images