Digital segmentation line design method, dental appliance forming method, dental appliance, apparatus, electronic device, and storage medium

Abstract

The present application discloses a digital segmentation line design method, a dental appliance forming method, a dental appliance, an apparatus, an electronic device, and a storage medium. The digital segmentation line design method comprises: acquiring a three-dimensional dental model and an attachment added on the three-dimensional dental model; determining a traversable region on the surface of the three-dimensional dental model, wherein the traversable region avoids the attachment; and generating a segmentation line in the traversable region, wherein the segmentation line extends from a first gingival line on a buccal-labial surface of the three-dimensional dental model to a second gingival line on a lingual surface. In the present application, the segmentation line can be generated by designing the traversable region, so that the design of the segmentation line is more reasonable; and the segmentation line extends from the first gingival line to the second gingival line, thereby enabling the present application to be applicable to multiple application scenarios. When a corresponding dental appliance is subsequently generated on the basis of the three-dimensional dental model, the dental appliance comprises an attachment accommodating cavity corresponding to the attachment and segment lines corresponding to the segmentation line, wherein the segment lines avoid the attachment accommodating cavity.

Description

Digital segmentation design methods, dental instrument forming methods, dental instruments, devices, electronic devices, and storage media.

[0001] This application claims priority to Chinese Patent Application No. 202411999401.2, filed on December 31, 2024, entitled "Design method of digital dividing line, forming method of dental appliance, dental appliance, device, electronic device and storage medium", the entire contents of which are incorporated herein by reference. Technical Field

[0002] This application relates to the field of orthodontic technology, and in particular to a design method for digital dividing lines, a forming method for dental instruments, dental instruments, devices, electronic devices, and storage media. Background Technology

[0003] With the continuous development of computer-aided design (CAD) and computer-aided manufacturing (CAM) technologies, digital dental technology has become an important part of modern dental treatment. Digital dental technology can convert detailed information about a patient's oral structure into digital data through digital scanning, 3D modeling, and other methods, providing fundamental data for subsequent dental appliance design and manufacturing.

[0004] In many application scenarios, it is necessary to design cutting schemes based on digital data, and obtaining effective cutting schemes is of great significance. Summary of the Invention

[0005] The purpose of this application is to provide a design method for digital dividing lines, a forming method for dental instruments, dental instruments, devices, electronic devices, and storage media, which can...

[0006] To achieve one of the above-mentioned objectives, one embodiment of this application provides a method for designing digital dividing lines, comprising:

[0007] Obtain a three-dimensional dental model and the attachments to be added to the three-dimensional dental model;

[0008] A passable area is defined on the surface of the three-dimensional dental model, and the passable area avoids the attachment.

[0009] A dividing line is generated in the passable area, the dividing line extending from the first gingival line on the labial and buccal surface of the three-dimensional dental model to the second gingival line on the lingual surface.

[0010] Optionally, the design method includes:

[0011] Determine the target area where the dividing line is located, the target area including multiple teeth;

[0012] Select a tooth that meets a first condition from among the plurality of teeth as the target tooth. The first condition includes that the area of ​​the passable region of the target tooth is not less than the area of ​​the passable region of the other teeth.

[0013] At least a partial dividing line is generated within the passable area of ​​the target tooth.

[0014] Optionally, when the area ratio of the passable region of the target tooth is equal to the area ratio of the passable region of other teeth, the first condition further includes: the target tooth is located on the mesial side of other teeth.

[0015] Optionally, the dividing line is entirely located within the target tooth, or the dividing line extends from the target tooth to other teeth adjacent to the target tooth.

[0016] Optionally, the mounting surface of a tooth includes mutually spaced non-accessible and accessible areas, the mounting surface being the labial / buccal or lingual surface of the tooth, the mounting surface including a mesial end and a distal end disposed opposite to each other, the non-accessible area including at least one of the following: a first peripheral area surrounding the attachment, a second peripheral area connecting the mesial end, and a third peripheral area connecting the distal end.

[0017] Optionally, in the near-far direction, the width of the first peripheral region ranges from 0.1mm to 1mm, the width of the second peripheral region ranges from 0.1mm to 1mm, and the width of the third peripheral region ranges from 0.1mm to 1mm.

[0018] Optionally, the design method includes:

[0019] The initial position of the dividing line is determined according to the second condition, which includes at least one of the following: the number of segments, the preferred position of the dividing line, and the location of the attachment.

[0020] The region including multiple teeth on both sides of the initial position is taken as the target region.

[0021] Optionally, the design method includes:

[0022] When there is an overlapping area between the first target area of ​​the first dividing line and the second target area of ​​the second dividing line, the overlapping area is divided into a first part and a second part, wherein the first target area includes the first part and the second target area includes the second part.

[0023] Optionally, the design method includes:

[0024] Select an initial point within the passable area;

[0025] Establish a first plane passing through the initial point;

[0026] Determine whether there is interference between the first plane and any attachment. If so, adjust the first plane to the target plane; otherwise, use the first plane as the target plane.

[0027] The boundary line between the target plane and the surface of the three-dimensional dental model is used as the dividing line.

[0028] Optionally, the first plane is perpendicular to the mesio-mesio direction, or the first plane forms an acute angle with the mesio-mesio direction.

[0029] Optionally, the design method includes:

[0030] Select several key points that are spaced apart from each other within the passable area;

[0031] The dividing line is formed by sequentially connecting several key points.

[0032] Optionally, the dividing line includes a first endpoint and a second endpoint disposed opposite to each other, the first endpoint being in the gingival region below the first gingival line, and the second endpoint being in the gingival region below the second gingival line.

[0033] To achieve one of the above-mentioned objectives, one embodiment of this application provides a method for molding a dental appliance, comprising:

[0034] The dividing line is obtained according to the design method of the digital dividing line described in any of the above technical solutions;

[0035] Obtain the cutting path data based on the dividing line;

[0036] Obtain a dental mold with attachments and a dental appliance material fitted onto the dental mold, wherein the dental appliance material includes an attachment receiving cavity corresponding to the attachments;

[0037] Based on the cutting path data, segment lines corresponding to the dividing lines are formed on the dental instrument material;

[0038] Dental appliances are formed based on dental appliance materials.

[0039] Optionally, the molding method includes:

[0040] Multiple sampling points and corresponding initial normal vectors are obtained on the dividing line;

[0041] Obstacle avoidance design is performed based on multiple initial normal vectors to obtain cutting path data.

[0042] Optionally, the molding method includes:

[0043] The infeasible region that hinders the initial normal vector is obtained using Gaussian mapping;

[0044] A pathfinding algorithm is used to obtain the target normal vector that avoids the infeasible region;

[0045] The cutting path data is obtained based on the multiple sampling points and the target normal vector.

[0046] Optionally, the molding method includes:

[0047] The execution parameters of the laser device are determined based on the cutting data path.

[0048] The segmented lines are formed by laser cutting according to the execution parameters.

[0049] Optionally, the molding method includes:

[0050] Cut the dental appliance material along the first gingival line and the second gingival line;

[0051] Demolding and trimming to form dental instruments.

[0052] To achieve one of the above-mentioned application objectives, one embodiment of this application provides a dental appliance, which is obtained by the dental appliance forming method described in any of the above technical solutions, and the dental appliance includes an accessory receiving cavity and segment lines.

[0053] Optionally, the dental appliance is an accessory mounting template or an invisible brace.

[0054] Optionally, the segment line includes a break line and / or a weak connection line. When the segment line is a weak connection line, different regions of the segment line have different tear resistance.

[0055] To achieve one of the above-mentioned objectives, one embodiment of this application provides an apparatus for designing digital dividing lines, comprising:

[0056] The first module is used to acquire a three-dimensional dental model and attachments to be added to the three-dimensional dental model;

[0057] The second module is used to determine a passable area on the surface of the three-dimensional dental model, wherein the passable area avoids the attachment;

[0058] The third module is used to generate a dividing line for the passable region, the dividing line extending from the first gingival line on the labial / buccal side of the three-dimensional dental model to the second gingival line on the lingual side.

[0059] To achieve one of the above-mentioned objectives, one embodiment of this application provides an electronic device, including a processor, a memory, and a communication bus, wherein the processor and the memory communicate with each other through the communication bus;

[0060] The memory is used to store application programs;

[0061] The processor is configured to, when executing the application program stored in the memory, implement the steps of the digital dividing line design method as described in any of the above technical solutions and the steps of the dental instrument forming method as described in any of the above technical solutions.

[0062] To achieve one of the above-mentioned objectives, one embodiment of this application provides a storage medium storing an application program, which, when executed, implements the steps of the digital dividing line design method described in any of the above technical solutions and the steps of the dental instrument forming method described in any of the above technical solutions.

[0063] Compared with the prior art, the beneficial effects of this application are as follows: the implementation method of this application can generate the dividing line by designing the passable area, the design of the dividing line is more reasonable, and the dividing line extends from the first gingival line to the second gingival line, which can be adapted to a variety of application scenarios.

[0064] The embodiments of this application can obtain the segmentation line on the three-dimensional dental model through the design method of digital segmentation line. When the corresponding dental appliance is subsequently generated based on the three-dimensional dental model, the dental appliance includes the attachment receiving cavity of the corresponding attachment and the segmentation line of the corresponding segmentation line, and the segmentation line avoids the attachment receiving cavity.

[0065] Before dental instruments are placed on the teeth, there are already segment lines on the instruments. These segment lines can be broken without the aid of additional tools. When the segment lines are completely broken, the dental instrument is divided into at least two segments, which makes it easier to remove the dental instrument and reduces the deformation of the dental instrument caused by the force applied when the user breaks it, thus improving the convenience of using the dental instrument.

[0066] The generated dental appliance includes a first edge line corresponding to the first gingival line and a second edge line corresponding to the second gingival line. The generated segment line extends from the first edge line to the second edge line, that is, the segment line spans the entire surface of the dental appliance. When the segment line is completely broken, the dental appliance can be divided into a completely broken multi-segment structure, further simplifying the user's operation.

[0067] In this embodiment, given the acquisition of the dividing line, cutting path data that can be matched with the laser cutting process can be further obtained based on the data of the dividing line. In this way, dental instruments with accessory receiving cavities and segmented lines can be obtained by combining with the traditional laser cutting process. The acquisition of cutting path data is more accurate and reliable. Attached Figure Description

[0068] Figure 1 is a flowchart illustrating the steps of a digital dividing line design method according to an embodiment of this application;

[0069] Figure 2 is a schematic diagram of a three-dimensional dental model according to an embodiment of this application;

[0070] Figure 3 is a schematic diagram of a dental appliance according to an embodiment of this application;

[0071] Figure 4 is a schematic diagram of the passable and non-passable areas in the embodiments of this application;

[0072] Figures 5 and 6 are step diagrams of determining the dividing line based on the target region according to the embodiments of this application;

[0073] Figures 7 to 9 are schematic diagrams of different target areas in the embodiments of this application;

[0074] Figure 10 is a flowchart illustrating the steps of determining the dividing line based on the initial point according to an embodiment of this application.

[0075] Figures 11 and 12 are schematic diagrams illustrating the determination of the initial point in an embodiment of this application;

[0076] Figures 13 to 15 are schematic diagrams of the determination of the dividing lines in the embodiments of this application;

[0077] Figure 16 is a schematic diagram of a dental appliance with segment lines located on the same plane according to an embodiment of this application;

[0078] Figure 17 is a flowchart illustrating the steps of determining the dividing line based on key points in an embodiment of this application.

[0079] Figure 18 is a schematic diagram of determining the dividing line based on key points according to an embodiment of this application;

[0080] Figure 19 is a schematic diagram of a dental appliance with a segmented curve according to an embodiment of this application;

[0081] Figure 20 is a step diagram of the molding method of the dental appliance according to the embodiments of this application;

[0082] Figure 21 is a schematic diagram of the dental appliance material and dental model according to an embodiment of this application;

[0083] Figure 22 is a schematic diagram of a dental appliance according to an embodiment of this application;

[0084] Figures 23 and 24 are step diagrams illustrating the steps of obtaining cutting path data according to an embodiment of this application;

[0085] Figures 25 and 26 are schematic diagrams of obstacle avoidance design in the embodiments of this application;

[0086] Figure 27 is a flowchart illustrating the steps of obtaining execution parameters according to an embodiment of this application;

[0087] Figure 28 is a schematic diagram of a dental appliance according to an embodiment of this application;

[0088] Figures 29 to 31 are schematic diagrams of different specific examples of segmentation lines of dental appliances according to embodiments of this application;

[0089] Figure 32 is a schematic diagram of a device for designing digital dividing lines according to an embodiment of this application. Detailed Implementation

[0090] The present application 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 application, 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 this application.

[0091] Referring to Figures 1 to 3, this is a schematic diagram of the design method for the digital dividing line 11 according to an embodiment of this application. The design method includes the following steps:

[0092] Step S1: Obtain the three-dimensional dental model 100 and the attachment 10 added to the three-dimensional dental model 100.

[0093] Optionally, the three-dimensional dental model 100 can be obtained by intraoral scanning, or by scanning a solid model of the dental jaw (e.g., a plaster model) or impression, but is not limited thereto. Annex 10 may be located on the labial / buccal surface A1 and / or the lingual surface A2 of the three-dimensional dental model 100.

[0094] Taking a three-dimensional dental model 100, which includes teeth and gingival regions, as an example, the three-dimensional dental model 100 includes a first gingival line A11 located on the labial / buccal surface A1 and a second gingival line A21 located on the lingual surface A2.

[0095] The three-dimensional dental model 100 can be a three-dimensional dental model of the maxilla and / or the mandible. When the three-dimensional dental model 100 is a three-dimensional dental model of the maxilla, it can include all or some of the maxillary teeth. When the three-dimensional dental model 100 is a three-dimensional dental model of the mandible, it can include all or some of the mandible teeth. This embodiment uses the example of the three-dimensional dental model 100 including all the mandible teeth.

[0096] Optionally, when acquiring the three-dimensional dental model 100 and its attachments 10, various data of the three-dimensional dental model 100 and its attachments 10 can be acquired simultaneously, such as dimensional data and positional data. This data is common digital data in the dental appliance design process and will not add any additional difficulty.

[0097] Step S2: Determine the passable region N on the surface of the three-dimensional dental model 100, and pass through region N to avoid attachment 10.

[0098] Step S3: Generate a dividing line 11 in the passable region N. The dividing line 11 extends from the first gingival line A11 on the labial and buccal surfaces A1 of the three-dimensional dental model 100 to the second gingival line A21 on the lingual surfaces A2.

[0099] When the dividing line 11 extends from the first gingival line A11 to the second gingival line A21, the dividing line 11 extends from the first gingival line A11 through the labial / buccal surface A1, the occlusal surface A3, and the lingual surface A2 of the three-dimensional dental model 100 to the second gingival line A21. Here, the occlusal surface A3 refers to the surface connecting the labial / buccal surface A1 and the lingual surface A2.

[0100] This embodiment can generate the dividing line 11 by designing a region N through which it can pass. The design of the dividing line 11 is more reasonable, and the dividing line 11 extends from the first gingival line A11 to the second gingival line A21, which can be adapted to a variety of application scenarios.

[0101] This embodiment obtains the segmentation line 11 on the three-dimensional dental model 100 through the design method of the digital segmentation line 11. When the corresponding dental appliance 200 is subsequently generated based on the three-dimensional dental model 100, the dental appliance 200 includes an accessory receiving cavity 20 corresponding to the accessory 10 and a segment line 21 corresponding to the segmentation line 11, and the segment line 21 avoids the accessory receiving cavity 20.

[0102] Before the dental instrument 200 is placed on the jaw, it already has segment lines 21, which can be disconnected without the aid of additional tools. When the segment lines 21 are completely disconnected, the dental instrument 200 is divided into at least two segments, which facilitates the removal of the dental instrument 200 and reduces deformation of the dental instrument 200 caused by the force applied when disconnecting it, thereby improving the ease of use of the dental instrument 200.

[0103] The generated dental appliance 200 includes a first edge line 201 corresponding to the first gingival line A11 and a second edge line 202 corresponding to the second gingival line A21. A segmented line 21 extends from the first edge line 201 to the second edge line 202, meaning the segmented line 21 spans the entire surface of the dental appliance 200. When the segmented line 21 is completely broken, the dental appliance 200 can be divided into completely disjointed segmented structures, further simplifying user operation.

[0104] Optionally, referring to Figure 4, a brief explanation of the passable region N can be provided.

[0105] The mounting surface A of a tooth includes mutually spaced non-passable regions N' and passable regions N. Mounting surface A is either the labial / buccal surface A1 or the lingual surface A2 of the tooth; here, we take the labial / buccal surface A1 as an example. The entire labial / buccal surface A1 is divided into non-passable regions N' and passable regions N. The shaded area in Figure 4 illustrates the non-passable region N', and the remaining area is the passable region N. The dividing line 11 can be freely designed within the passable region N.

[0106] Mounting surface A includes a near-center end A31 and a far-center end A32 positioned opposite each other. The non-passable area N' includes at least one of the following: a first peripheral area N1' surrounding attachment 10, a second peripheral area N2' connecting the near-center end A31, and a third peripheral area N3' connecting the far-center end A32. Since the dividing line 11 is positioned to avoid attachment 10, the non-passable area N' substantially also includes the area where attachment 10 is mounted.

[0107] In the near-to-far direction, the width G1 of the first peripheral region N1' (including the left and right regions of Annex 10) ranges from 0.1mm to 1mm, the width G2 of the second peripheral region N2' ranges from 0.1mm to 1mm, and the width G3 of the third peripheral region N3' ranges from 0.1mm to 1mm.

[0108] The widths G1, G2, and G3 can be customized based on factors such as the dimensions of the mounting surface A, the dimensions of accessory 10, and the material of the subsequently formed dental appliance 200. The first peripheral region N1' also includes the upper and lower regions located above accessory 10, and the width of the upper and lower regions can also range from 0.1mm to 1mm, but is not limited to this.

[0109] When the mounting surface A is not equipped with accessory 10, the non-passable area N' of the mounting surface A includes a second peripheral area N2' connecting the near-middle end A31 and a third peripheral area N3' connecting the far-middle end A32.

[0110] Optionally, when the mounting surface A has an accessory 10 and the dividing line 11 is too close to the accessory 10, it will cause the accessory receiving cavity 20 and the dividing line 21 on the subsequently formed dental appliance 200 to interfere with each other. Therefore, it is necessary to set a first peripheral area N1' to avoid the dividing line 11 being too close to the accessory 10.

[0111] Mounting surface A includes tooth surface T1 and adjacent tooth space T2. Tooth surface T1 is the central area of ​​mounting surface A, and adjacent tooth space T2 is the area between adjacent teeth. Adjacent tooth space T2 is located on both sides of tooth surface T1, and the morphological undulation of adjacent tooth space T2 is greater than that of tooth surface T1.

[0112] Generally, segment lines 21 can be formed on the dental instrument 200 by laser cutting. The greater the morphological undulation, the more difficult it is for the laser to accurately perform the cutting operation. Due to the large morphological undulation of the interdental space T2, when the segment line 11 is too close to the mesial end A31 and distal end A32 of the mounting surface A (regardless of whether the mounting surface A has the accessory 10), the segment line 11 will enter or approach the interdental space T2 on both sides of the mounting surface A, making it difficult to accurately perform the subsequent laser cutting process to form the segment line 21. Therefore, it is necessary to set a second peripheral region N2' and a third peripheral region N3' to avoid the segment line 11 being too close to the mesial end A31 and distal end A32.

[0113] Optionally, referring to Figures 5 to 9, step S3 specifically includes:

[0114] Step S31: Determine the target region 101 where the dividing line 11 is located. The target region 101 includes multiple teeth.

[0115] Optionally, the target region 101 can be a partial region of the three-dimensional dental model 100. For example, the target region 101 can be the anterior tooth region, the left posterior tooth region, the right posterior tooth region, etc. The number of teeth included in the target region 101 is unlimited, and multiple teeth in the target region 101 can be used as candidate teeth for setting the dividing line 11.

[0116] Step S31 specifically includes:

[0117] Step S311: Determine the initial position of the dividing line 11 according to the second condition, which includes at least one of the following: number of segments, preferred dividing line position, and location of attachment 10.

[0118] Step S312: The region including multiple teeth on both sides of the initial position is designated as the target region 101.

[0119] Optionally, the "number of segments" can refer to the expected number of segments into which the three-dimensional dental model 100 needs to be divided (corresponding to the number of segments into which the dental instrument 200 needs to be divided). For example, when the three-dimensional dental model 100 needs to be roughly divided into two or four segments, the initial position of one of the dividing lines 11 is approximately located at the midline of the teeth in the three-dimensional dental model 100. In this case, the target area can be the region including the two central incisors on both sides of the midline, or the target area can be the region including the two central incisors and two lateral incisors on both sides of the midline.

[0120] "Preferred dividing line position" can refer to the position that the user believes is more suitable for setting the dividing line 11 based on experience. The preferred dividing line position can be directly used as the initial position, and the area including multiple teeth on both sides of the initial position can be used as the target area 101.

[0121] "Location of Attachment 10" means that when Attachment 10 is located on a tooth, the initial position of the dividing line 11 can be located near Attachment 10, and the area including multiple teeth on both sides of the initial position can be used as the target area 101.

[0122] Optionally, one dividing line 11 corresponds to one target area 101, but this is not a limitation; one dividing line 11 can also correspond to multiple target areas 101. For example, if one target area 101 is not suitable for setting a dividing line 11, it can be replaced with another target area 101. Alternatively, one target area 101 can correspond to multiple dividing lines 11; here, we take one dividing line 11 corresponding to one target area 101 as an example.

[0123] Assume that a first dividing line 11a and a second dividing line 11b are formed on a three-dimensional dental model 100. The first dividing line 11a corresponds to a first target region 101a, and the second dividing line 11b corresponds to a second target region 101b. When there is an overlapping region C between the first target region 101a of the first dividing line 11a and the second target region 101b of the second dividing line 11b, the overlapping region C is divided into a first part C1 and a second part C2. The first target region 101a includes the first part C1, and the second target region 101b includes the second part C2. In this way, the first target region 101a and the second target region 101b can be separated.

[0124] Referring to Figure 7, assuming the initial position of the dividing line 11 is determined based on the location of attachment 10, and attachment 10 is located at tooth 3, a first dividing line 11a needs to be formed near teeth 2 and 3, and a second dividing line 11b needs to be formed near teeth 3 and 4. The first target region 101a corresponding to the first dividing line 11a includes teeth 2 and 3, and the second target region 101b corresponding to the second dividing line 11b includes teeth 3 and 4. The first target region 101a and the second target region 101b form an overlapping region C at tooth 3. At this time, tooth 3 can be divided into a first part C1 near tooth 2 and a second part C2 near tooth 4 (for example, tooth 3 can be divided into a first part C1 and a second part C2). The first target region 101a ultimately includes tooth 2 and the first part C1, and the second target region 101b ultimately includes tooth 4 and the second part C2. The first target region 101a and the second target region 101b are separated. The first dividing line 11a may eventually fall on tooth 2, and the second dividing line 11b may eventually fall on tooth 4.

[0125] Optionally, after determining the target region 101, data on multiple teeth included in the target region 101 and data on attachment 10 can be further obtained. The data obtained in step S1 can be coarse data. The data obtained in step S31 can be further detailed data, such as STL data of multiple teeth in the target region 101, coordinate data of attachment 10, etc., which can reduce the data processing pressure.

[0126] Step S32: Select the tooth that meets the first condition from among the multiple teeth as the target tooth T. The first condition includes that the area ratio of the passable region N of the target tooth T is not less than the area ratio of the passable region N of the other teeth.

[0127] Optionally, "the area percentage of passable region N" refers to the ratio between the area of ​​passable region N and the corresponding total area.

[0128] For example, when defining the area percentage of the passable region N as the entire labial / buccal surface A1, the corresponding total area is the area of ​​the entire labial / buccal surface A1. The area of ​​the labial / buccal surface A1 of a tooth is E1, and the area of ​​all passable regions N on the labial / buccal surface A1 of that tooth is E2. The area percentage of the passable regions N is the ratio of E2 to E1. Choosing a tooth with a relatively large area percentage of the passable regions N as the target tooth T provides more space for setting the dividing line 11.

[0129] Alternatively, when the area percentage of passable region N is defined by the left half (or right half) of the lip and cheek surface A1, the corresponding total area is the area of ​​the left half of the lip and cheek surface A1, and the area of ​​passable region N is the area of ​​passable region N located in the left half of the lip and cheek surface A1.

[0130] The area of ​​the passable region N of the target tooth T and the area of ​​the passable region N of other teeth need to be obtained and compared using the same area, for example, the area of ​​the passable region N is defined using the entire labial and buccal surface A1.

[0131] For example, referring to Figure 8, the target area 101 includes four teeth, three of which have attachments 10, and one tooth does not have attachments 10. In this case, the area of ​​the passable region N of the tooth without attachments 10 is relatively large, and this tooth without attachments 10 can be regarded as the target tooth T.

[0132] Referring to Figure 9, the target region 101 includes three teeth. When all three teeth are equipped with attachments 10, the tooth with the largest area proportion of the passable region N can be selected as the target tooth T. For example, the left side region of the three teeth can be selected to define the area proportion of the passable region N, and the tooth with the larger gap between the first peripheral region N1' and the second peripheral region N2' can be selected as the target tooth T, with the dividing line 11 set at this gap.

[0133] Optionally, when the area ratio of the passable region N of the target tooth T is equal to the area ratio of the passable region N of other teeth, the first condition also includes: the target tooth T is located on the mesial side of other teeth, that is, the area ratio of the passable region N is judged first, and when the area ratios of the passable regions N are the same, the tooth that is relatively closer to the mesial side is selected as the target tooth T.

[0134] The advantages of choosing a tooth that is relatively close to the mesial side as the target tooth T are: (1) When the dividing line 11 is close to the tooth midline, the lengths of the two segments of the three-dimensional dental model 100 after the division are as close as possible in the mesial direction; (2) When the dividing line 11 is not close to the tooth midline, the length of the three-dimensional dental model 100 on the distal side of the dividing line 11 in the mesial direction can be guaranteed as much as possible.

[0135] Optionally, the target tooth T can be selected based solely on the area proportion of the passable region N on the labial / buccal surface A1 of multiple teeth within the target region 101. In this case, the portion of the dividing line 11 corresponding to the labial / buccal surface A1 can be placed on the target tooth T, and the portion of the dividing line 11 corresponding to the lingual surface A2 can also be placed on the target tooth T, or placed on the passable region N of other teeth.

[0136] Alternatively, the target tooth T can be selected based solely on the area proportion of the passable region N on the labial / buccal surface A1 of multiple teeth within the target region 101. In this case, the portion of the dividing line 11 corresponding to the lingual surface A2 can be placed on the target tooth T, and the portion of the dividing line 11 corresponding to the labial / buccal surface A1 can also be placed on the target tooth T, or placed on the passable region N of other teeth.

[0137] Alternatively, the target tooth T can be selected based on the area proportion of the passable region N on the labial / buccal surface A1 and lingual surface A2 of multiple teeth within the target region 101. In this case, one or two target teeth T may be selected. When there is one target tooth T, the portions of the dividing line 11 corresponding to both the labial / buccal surface A1 and the lingual surface A2 can be placed on that target tooth T. When there are two target teeth T, the portion of the dividing line 11 corresponding to the labial / buccal surface A1 can be placed on the corresponding target tooth T, and the portion of the dividing line 11 corresponding to the lingual surface A2 can be placed on the other target tooth T. The two target teeth T are preferably two adjacent teeth, but this is not a limitation.

[0138] Step S33: Generate at least a partial dividing line 11 within the passable region N of the target tooth T.

[0139] Optionally, the dividing line 11 may be entirely located within the target tooth T. For example, the dividing line 11 extends from the accessible region N of the labial / buccal surface A1 of the target tooth T through the occlusal surface A3 of the target tooth T to the accessible region N of the lingual surface A2 of the target tooth T, meaning that the dividing line 11 passes through only one tooth.

[0140] Alternatively, the dividing line 11 extends from the target tooth T to other teeth adjacent to the target tooth. For example, the dividing line 11 extends from the passable area N of the labial-buccal surface A1 of the target tooth T through the passable area N of the labial-buccal surface A1 of the adjacent tooth, the occlusal surface A3 of the adjacent tooth, to the passable area N of the lingual surface A2 of the adjacent tooth, that is, the dividing line 11 passes through two teeth.

[0141] Optionally, referring to Figures 10 to 16, step S3 may also include:

[0142] Step S31': Referring to Figures 11 and 12, select an initial point F within the passable region N.

[0143] Optionally, for example, an initial point F can be selected within the passable region N of the labial-buccal surface A1 of the target tooth T. Referring to Figure 11, when the labial-buccal surface A1 of the target tooth T is not equipped with attachment 10, the center point of the labial-buccal surface A1 can be used as the initial point F. The initial point F can also be offset from the center point by a certain distance as needed.

[0144] Referring to Figure 12, when the labial and buccal surface A1 of the target tooth T is provided with attachment 10, the midpoint of the gap between the first peripheral region N1' and the third peripheral region N3' can be used as the initial point F, or the midpoint of the gap between the first peripheral region N1' and the second peripheral region N2' can be used as the initial point F, depending on the size of the gap or specific needs.

[0145] Optionally, the initial point F can be considered as the point obtained by offsetting the midpoint of the lip and cheek surface A1 outwards. The initial point F can be offset to the point just away from the first peripheral region N1', or the initial point F can be offset to the midpoint of the gap.

[0146] Step S32': Referring to Figure 13, establish the first plane M passing through the initial point F.

[0147] Optionally, the first plane M can be perpendicular to the mesial-to-mesial direction, or the first plane M can form an acute angle with the mesial-to-mesial direction.

[0148] Step S33': Referring to Figure 14, determine whether there is interference between the first plane M and any attachment 10. If so, adjust the first plane M to the target plane M'; otherwise, use the first plane M as the target plane M'.

[0149] Optionally, for example, if the lingual surface A2 of the target tooth T has an attachment 10, the first plane M may interfere with the attachment 10 of the lingual surface A2 of the target tooth T. In this case, the first plane M can be rotated by a small angle with the major axis of the target tooth T as the axis of rotation until it no longer interferes with the attachment 10 of the lingual surface A2, and the plane at this point can be taken as the target plane M'. Alternatively, the position of the initial point F can be adjusted appropriately until it no longer interferes with the attachment 10 of the lingual surface A2, and the plane at this point can be taken as the target plane M'.

[0150] Step S34': Referring to Figure 15, the boundary line between the target plane M' and the surface of the three-dimensional dental model 100 is taken as the dividing line 11.

[0151] Optionally, a first intersection point 102 is formed between the target plane M' and the first gingival line A11 of the three-dimensional dental model 100, and a second intersection point 103 is formed between the target plane M' and the second gingival line A21 of the three-dimensional dental model 100. The first intersection point 102 and the second intersection point 103 can be extended toward the gingiva to form a first endpoint 104 and a second endpoint 105 located on the gingiva, respectively. In this way, it can be ensured that the segmented line 21 formed on the dental instrument 200 extends to the first edge line 201 and the second edge line 202.

[0152] The dividing line 11 includes a first endpoint 104 and a second endpoint 105 disposed opposite to each other. The first endpoint 104 is located in the gingival region below the first gingival line A11, and the second endpoint 105 is located in the gingival region below the second gingival line A21.

[0153] Optionally, after obtaining the dividing line 11, the data of the dividing line 11 can also be obtained.

[0154] Referring to Figure 17, the segment lines 21 on the dental appliance 200 formed according to steps S31' to S34' are located on the same plane.

[0155] Optionally, referring to Figures 17 to 19, step S3 may also include:

[0156] Step S31”: Select several key points J that are spaced apart from each other within the passable area N.

[0157] Step S32”: Connect several key points J in sequence to form a dividing line 11.

[0158] Optionally, several key points J can be points freely selected by the user, or points automatically generated by the system based on the passable area N, which can greatly improve the design freedom of the dividing line 11.

[0159] Referring to Figure 18, the dividing line 11 is not located in a plane at this time. The dividing line 11 is in the form of a curve, and the specific shape of the curve can be arbitrarily selected according to specific needs.

[0160] Optionally, after obtaining the dividing line 11, the data of the dividing line 11 can also be obtained.

[0161] Referring to Figure 19, the segment line 21 on the dental appliance 200 formed according to steps S31” to S32” is a curve.

[0162] Referring to Figures 20 to 27, this application also provides a method for molding a dental appliance 200, including the following steps:

[0163] Step S4: Obtain the dividing line 11 according to the design method of the digital dividing line 11.

[0164] Step S5: Obtain the cutting path data based on the dividing line 11.

[0165] Optionally, laser cutting is generally used to form segment lines 21 on the dental instrument 200, and the cutting path data is used to control the laser cutting process.

[0166] Step S6: Referring to Figure 21, obtain a dental mold 300 with attachment 10 and a dental appliance material 400 fitted on the dental mold 300. The dental appliance material 400 includes an attachment receiving cavity 20 corresponding to attachment 10.

[0167] Optionally, the dental model 300 is a solid model, and the dental appliance material can be a thermoforming material. The thermoforming material is applied to the dental model 300, and a dental appliance material 400 that matches the dental model 300 with attachment 10 can be formed through a thermoforming process. The dental appliance material 400 extends to the gingival region, but is not limited thereto; it can also be formed using a 3D printing process.

[0168] Step S7: Based on the cutting path data, form segment lines 21 corresponding to the dividing lines 11 on the dental instrument material 400.

[0169] Optionally, during the laser cutting process, the dental instrument material 400 is always fitted onto the dental model 300. When the dividing line 11 extends to the gingival region (for example, the dividing line 11 includes a first endpoint 104 and a second endpoint 105 that are set opposite to each other), the resulting segment line 21 also extends to the gingival region, which can ensure the integrity of the segment line 21.

[0170] Step S8: Form dental appliance 200 based on dental appliance material 400.

[0171] Optionally, after forming the dental appliance material 400 with segment lines 21, the dental appliance material 400 can be cut along the first gingival line A11 and the second gingival line A21, and the dental appliance 200 can be formed through traditional processes such as demolding and trimming. At this time, since the segment lines 21 extend to the gingival region, it can be ensured that the segment lines 21 extend to the first edge line 201 and the second edge line 202 of the dental appliance 200.

[0172] The order of cutting along the first gingival line A11 and the second gingival line A21 and the cutting along the segment line 21 can be determined according to the actual situation. There is no absolute order for traditional processes such as demolding and trimming.

[0173] Optionally, in the absence of logical connection, there is no clear sequential relationship between the above steps. For example, step S6 and step S5 can be performed simultaneously, or step S6 can be performed earlier than step S5.

[0174] Based on the design method of the aforementioned digital dividing line 11, this embodiment can further obtain cutting path data that can match the laser cutting process based on the data of the dividing line 11. Then, in conjunction with the traditional laser cutting process, a dental instrument 200 with an accessory receiving cavity 20 and a segment line 21 can be obtained. The acquisition of cutting path data is more accurate and reliable.

[0175] Optionally, referring to Figure 23, step S5 specifically includes:

[0176] Step S51: Obtain multiple sampling points and corresponding initial normal vectors on the dividing line 11.

[0177] Optionally, multiple sampling points on the dividing line 11 and their corresponding initial normal vectors can be recorded in the form of discrete point coordinates. The initial normal vectors are perpendicular to the surface of the three-dimensional dental model 100.

[0178] Optionally, linear interpolation and equidistant sampling can be used to make the spatial distance between multiple sampling points equal, and the initial normal vector is a unit normal vector.

[0179] Step S52: Obtain cutting path data by designing obstacle avoidance based on multiple initial normal vectors.

[0180] Optionally, obstacle avoidance design mainly refers to checking for laser light path interference during the manufacturing process through simulation to ensure manufacturability.

[0181] Referring to Figures 24 to 26, the obstacle avoidance design in step S52 specifically includes:

[0182] Step S521: Use Gaussian mapping to obtain the infeasible region that hinders the initial normal vector.

[0183] Optionally, referring to Figure 25, multiple initial normal vectors are sampled and mapped onto a unit sphere 50 through Gaussian mapping to obtain multiple mapped unit normal vectors 51. The multiple unit normal vectors 51 are connected to form a unit normal vector trajectory 53 on the unit sphere 50.

[0184] The infeasible region 54 is calculated through collision detection and design constraints, and then mapped to the unit sphere 50.

[0185] Optionally, infeasible regions 54 refer to regions where the corresponding unit normal vector 51 would cause laser path interference or exceed design constraints (e.g., exceed the permissible operating range of one or more axes of an industrial robot / machine tool used to perform laser cutting).

[0186] Step S522: Use a pathfinding algorithm to obtain the target normal vector that avoids the infeasible region 54.

[0187] Optionally, by using an appropriate pathfinding algorithm in conjunction with Figure 26, the trajectory of the target normal vector after avoidance can be obtained. By parameterizing the arc length of the trajectory points on the target normal vector trajectory 55, multiple target normal vectors can be obtained by sampling the trajectory of the target normal vector 55 after avoidance, and the multiple target normal vectors can be remapped back to the dividing line 11.

[0188] Step S523: Obtain cutting path data based on multiple sampling points and target normal vector.

[0189] Optionally, the target normal vector can be regarded as the normal vector after obstacle avoidance design of the initial normal vector. The final cutting path data will not interfere with the optical path and can be manufactured and processed by downstream processes.

[0190] Optionally, referring to Figure 27, step S7 specifically includes:

[0191] Step S71: Determine the execution parameters of the laser device based on the cutting data path.

[0192] Optionally, the execution parameters may include the linear speed of laser cutting, the power of the laser, the frequency of the laser, etc., and different shapes of segmented lines 21 can be formed according to different execution parameters.

[0193] Step S72: Laser cutting to form segment lines 21 according to the execution parameters.

[0194] Referring to Figure 28, this application embodiment also provides a dental appliance 200, which is obtained by a molding method for dental appliance 200. The dental appliance 200 includes an accessory receiving cavity 20 and a segment line 21.

[0195] Dental instrument 200 includes an accessory installation template or invisible braces.

[0196] Optionally, taking the dental appliance 200 as an example, the attachment installation template 200 can be used as an example. After the attachment installation template 200 is worn onto the tooth, the attachment can be formed, for example, by filling the attachment receiving cavity 20 with light-cured resin. The attachment is then bonded to the tooth surface, and the attachment installation template 200 can be removed, leaving the attachment on the tooth surface.

[0197] The attachment installation template 200 has pre-set segment lines 21, meaning that the attachment installation template 200 already has segment lines 21 before it is worn onto the teeth, and the segment lines 21 can be disconnected without the need for additional tools. When the segment lines 21 are completely disconnected, the attachment installation template 200 is divided into at least two segments, which facilitates the removal of the attachment installation template 200.

[0198] Taking the example of dividing the accessory installation template 200 into two mutually disconnected sub-accessory installation templates 200a and 200b by disconnecting a segment line 21, when removing the accessory installation template 200, the first sub-accessory installation template 200a and the second sub-accessory installation template 200b can be removed separately. Since the first sub-accessory installation template 200a (or the second sub-accessory installation template 200b) has relatively weaker encapsulation of the teeth, it facilitates the removal of the first sub-accessory installation template 200a (or the second sub-accessory installation template 200b). Especially when the segment line 21 is positioned close to the accessory receiving cavity 20, it reduces the obstruction of the accessory molded on the tooth surface to the removal process of the accessory installation template 200.

[0199] By setting segment lines 21, the operation of disconnecting the accessory installation template 200 by the user can be greatly simplified, thereby reducing the deformation of the accessory installation template 200 caused by the force exerted when the user disconnects it, and improving the convenience of using the accessory installation template 200 and the reliability of accessory installation.

[0200] The segment line 21 extends from the first edge line 201 to the second edge line 202, meaning that the segment line 21 spans the entire surface of the accessory mounting template 200. When the segment line 21 is completely broken, the accessory mounting template 200 can be divided into a completely disjointed multi-segment structure, further simplifying user operation.

[0201] Optionally, segment 21 may include a break line and / or a weak connection line.

[0202] The entire segment line 12 is a broken line, or the entire segment line 12 is a weakly connected line, or a portion of segment line 12 is a broken line and a portion is a weakly connected line.

[0203] "Break line" refers to the segment line 21 completely penetrating the attachment installation template 200 in the thickness direction. Taking a segment line 21 as an example, before the segment line 21 is torn, the attachment installation template 200 already includes a completely broken first sub-attachment installation template 200a and a second sub-attachment installation template 200b. That is, the attachment installation template 200 worn on the jaw consists of the completely broken first sub-attachment installation template 200a and second sub-attachment installation template 200b.

[0204] The accessory installation template 200 is generally made of a polymer material with good toughness (i.e., strong tear resistance). The accessory installation template 200 is difficult to break. The segmented line 21 in the form of a "break line" can directly eliminate the need to break the accessory installation template 200.

[0205] "Weak connection line" refers to a segment line 21 that does not completely penetrate the accessory installation template 200 in the thickness direction. Taking a segment line 21 as an example, before the segment line 21 is torn, the first sub-accessory installation template 200a and the second sub-accessory installation template 200b in the accessory installation template 200 are still connected together. The weak connection line is an easy-to-tear line, for example, the user can tear the weak connection line by applying a small force, which is convenient for the user to operate.

[0206] When segment line 21 is a weak connecting line, segment line 21 can be torn off before or after the tooth is fitted. When segment line 21 is torn off before the tooth is fitted, the attachment installation template 200 fitted onto the tooth consists of a completely disconnected first sub-attachment installation template 200a and a second sub-attachment installation template 200b. When segment line 21 is torn off after the tooth is fitted, the attachment installation template 200 fitted onto the tooth consists of a connected first sub-attachment installation template 200a and a second sub-attachment installation template 200b.

[0207] Optionally, when the segment line 21 is a weak connection line, different regions of the segment line 21 have different tear resistance.

[0208] Referring to Figures 29 to 31, segment line 21 includes weak connecting lines, and the same weak connecting line includes a first region 211 and a second region 212. The tear resistance of the first region 211 is not less than the tear resistance of the second region 212.

[0209] "Tear resistance" characterizes the amount of external force required to break a certain area. The greater the tear resistance, the greater the external force required to break it. Tear resistance is related to the material of the accessory installation template 200 itself, the width W and depth H of the cut, etc. Here, we take the example of using the same material for all areas of the accessory installation template 200.

[0210] Optionally, the same weak connection line includes a first slot 213 and a second slot 214, wherein the tear resistance of the first slot 213 is not less than the tear resistance of the second slot 214.

[0211] The weak connection line includes a connected slotted area 215 and a closed area 216. The closed area 216 is closer to the cavity S formed by the accessory mounting template 200 to accommodate the tooth jaw than the slotted area 215. The slotted area 215 includes a first slot 213 and a second slot 214. The slotted area 215 is formed by laser cutting the side of the accessory mounting template 200 away from the cavity S. The first slot 213 and the second slot 214 can be obtained by selecting specific execution parameters.

[0212] The first slot 213 has a first width W1 in the direction perpendicular to the extension direction of the segment line 12 and a first depth H1 in the thickness direction, and the second slot 214 has a second width W2 in the direction perpendicular to the extension direction of the segment line 12 and a second depth H2 in the thickness direction, wherein the first width W1 is not greater than the second width W2, and / or the first depth H1 is not greater than the second depth H2.

[0213] Width W is inversely correlated with tear strength, and depth H is also inversely correlated with tear strength. For ease of explanation, we will take the first slot 213 and the second slot 214 as examples where only the width W differs, i.e., the first depth H1 is equal to the second depth H2, and the first width W1 is not greater than the second width W2.

[0214] Below are some specific examples of segment lines 21 being all weak connectors.

[0215] In the first specific example, referring to Figure 29, all regions of segment 21 have equal tear resistance, that is, all regions have the same width W and depth H.

[0216] Two regions are arbitrarily selected at segment line 21 as the first region 211 and the second region 212. The tear resistance of the first region 211 is equal to the tear resistance of the second region 212. For example, the first region 211 includes a first groove 213, the second region 212 includes a second groove 214, the first depth H1 is equal to the second depth H2, and the first width W1 is equal to the second width W2.

[0217] In the second specific example, referring to Figure 30, different regions of segment 21 have different tear resistance.

[0218] Two regions are selected at the same segment line 21 as a first region 211 and a second region 212, where the tear resistance of the first region 211 is greater than that of the second region 212. For example, the first region 211 includes a first groove 213, the second region 212 includes a second groove 214, the first depth H1 is equal to the second depth H2, and the first width W1 is less than the second width W2.

[0219] In the extending direction of the segment line 21, the first region 211 has a first length L1 (i.e., the first slot 213 has a first length L1), and the second region 212 has a second length L2 (i.e., the second slot 214 has a second length L2). The first region 211 and the second region 212 can be alternately arranged in the extending direction of the segment line 21, so that different regions of the segment line 21 have different tear resistance.

[0220] The first length L1 and the second length L2 can be determined according to actual needs. This specific example provides a segmented line 21 with alternating widths, where a narrower section of cutting width W is set at intervals, making it more difficult to break in that section and avoiding accidental breakage caused by accidental external force or unintended operation.

[0221] Optionally, the first region 211 is connected to the first edge line 201, the second region 212 is farther away from the first edge line 201 than the first region 211, and / or the first region 211 is connected to the second edge line 202, the second region 212 is farther away from the second edge line 202 than the first region 211.

[0222] Taking a first region 211 connecting a first edge line 201 and a second edge line 202, and a second region 212 located in the middle of a segment line 21 and connecting the two first regions 211 on both sides as an example. That is, in the extension direction of the segment line 21, the segment line 21 includes a first region 211, a second region 212 and a first region 211 connected in sequence, and the first length L1 of the first region 211 is, for example, approximately 20 mm.

[0223] The first region 211, located at the first edge line 201 and the second edge line 202 of the segment line 21, has a greater tear resistance, while the second region 212, located in the middle of the segment line 21, has a smaller tear resistance. On the one hand, the first region 211, with its greater tear resistance, can prevent the segment line 21 from breaking accidentally. On the other hand, after the first region 211 is broken by applying a small force, the second region 212 is easier to break, making the entire breaking process smoother.

[0224] In other specific examples, segment 21 may also include a third region with a third width, etc.

[0225] In the third specific example, referring to Figure 31, different regions of segment 21 have different tear resistance.

[0226] Two regions are selected at the same segment line 21 as the first region 211 and the second region 212, with the tear resistance of the first region 211 being greater than that of the second region 212.

[0227] For example, the first region 211 includes alternating first slots 213 and second slots 214. In the extension direction of the segment line 21, the first slot 213 has a first length L1, the second slot 214 has a second length L2, and the first length L1 and the second length L2 are in a first length ratio.

[0228] The second region 212 includes alternating first slots 213 and second slots 214. The first slot 213 has a first length L1, and the second slot 214 has a second length L2. The ratio between the first length L1 and the second length L2 is a second length ratio, and the first length ratio is greater than the second length ratio.

[0229] Here, taking as an example two first slots 213 in the first region 211 and the second region 212 having the same first width W1 and first depth H1, and two second slots 214 in the first region 211 and the second region 212 having the same second width W2 and second depth H2. The two first slots 213 in the first region 211 and the second region 212 have different first lengths L1, and / or the two second slots 214 in the first region 211 and the second region 212 have different second lengths L2. By specifically designing the lengths so that the first length ratio is greater than the second length ratio, the proportion of first slots 213 in the first region 211 is higher, which can make the tear resistance of the first region 211 greater than that of the second region 212.

[0230] For example, the first length ratio can be greater than 1, and the second length ratio can be in the range of 0-1, which can be selected according to specific needs.

[0231] Optionally, the first region 211 is connected to the first edge line 201, the second region 212 is farther away from the first edge line 201 than the first region 211, and / or the first region 211 is connected to the second edge line 202, the second region 212 is farther away from the second edge line 202 than the first region 211.

[0232] Taking a first region 211 connecting a first edge line 201 and a second edge line 202, and a second region 212 located in the middle of a segment line 21 and connecting the two first regions 211 on both sides as an example. That is, in the extension direction of the segment line 21, the segment line 21 includes a first region 211, a second region 212 and a first region 211 connected in sequence, and the first length L1 of the first region 211 is, for example, approximately 20 mm.

[0233] The first region 211, located at the first edge line 201 and the second edge line 202 of the segment line 21, has a greater tear resistance, while the second region 212, located in the middle of the segment line 21, has a smaller tear resistance. On the one hand, the first region 211, with its greater tear resistance, can prevent the segment line 21 from breaking accidentally. On the other hand, after the first region 211 is broken by applying a small force, the second region 212 is easier to break, making the entire breaking process smoother.

[0234] Referring to Figure 32, this application embodiment also provides an apparatus 600 for designing digital dividing lines 11, comprising:

[0235] The first module 60 is used to acquire the three-dimensional dental model 100 and the attachments 10 added to the three-dimensional dental model 100.

[0236] The second module 61 is used to determine the passable region N on the surface of the three-dimensional dental model 100, and to pass through the region N to avoid attachment 10.

[0237] The third module 62 is used to generate a dividing line 11 through the region N. The dividing line 11 extends from the first gingival line A11 on the labial and buccal side of the three-dimensional dental model 100 to the second gingival line A21 on the lingual side of the model.

[0238] The device 600 can also be configured based on the design method of the digital dividing line 11 in any of the aforementioned technical solutions. Specifically, based on the correlation between the steps, related steps can be implemented in the same or different modules.

[0239] The aforementioned device, or its modules or units, may be implemented by a computer chip or physical entity, or by a product with corresponding functions. While the device is described in terms of multiple modules, in other embodiments, the functions of the modules may be implemented in one or more software or hardware components.

[0240] This application provides a storage medium, which may specifically be a computer-readable storage medium. The storage medium can be installed in a computer and store an application program. In this case, the storage medium can be any available medium that the computer can access data, or it can be a storage device such as a server or data center that integrates one or more available media. The available medium can be a magnetic medium such as a floppy disk, hard disk, or magnetic tape; an optical medium such as a DVD (Digital Video Disc); or a semiconductor medium such as an SSD (Solid State Disk).

[0241] When the application is executed, it implements the steps of any of the technical solutions in the design method of the aforementioned digital dividing line 11 and the molding method of the aforementioned dental appliance 200.

[0242] This application provides an electronic device, which may be a computer, mobile phone, tablet computer, etc. This application does not limit the specific type of electronic device.

[0243] The electronic device includes at least one processor, at least one memory, and a communication bus. The at least one processor and at least one memory communicate with each other via the communication bus.

[0244] The communication bus can include any number of buses and bridge circuits. In some implementations, in addition to connecting the processor and memory, the communication bus can also be used to connect peripheral devices or other peripheral circuits.

[0245] The memory is used to store application programs.

[0246] The processor is used to implement the steps of any of the technical solutions in the aforementioned design method of digital dividing line 11 and the aforementioned molding method of dental appliance 200 when executing the application stored in memory.

[0247] In summary, this application can generate the dividing line 11 by designing a region N through which the dividing line 11 can be passed. The design of the dividing line 11 is more reasonable, and the dividing line 11 extends from the first gingival line A11 to the second gingival line A21, which can be adapted to a variety of application scenarios.

[0248] This application obtains the segmentation line 11 on the three-dimensional dental model 100 through the design method of digital segmentation line 11. When the corresponding dental appliance 200 is subsequently generated based on the three-dimensional dental model 100, the dental appliance 200 includes the attachment receiving cavity 20 corresponding to the attachment 10 and the segment line 21 corresponding to the segmentation line 11. The segment line 21 avoids the attachment receiving cavity 20.

[0249] Given the division line 11, this application can further obtain cutting path data that matches the laser cutting process based on the data of the division line 11. Then, in conjunction with the traditional laser cutting process, a dental instrument 200 with an accessory receiving cavity 20 and a segment line 21 can be obtained. The acquisition of cutting path data is more accurate and reliable.

[0250] 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.

[0251] The detailed descriptions listed above are merely specific descriptions of feasible implementation methods of this application and are not intended to limit the scope of protection of this application. All equivalent implementation methods or modifications made without departing from the spirit of the art of this application should be included within the scope of protection of this application.

Claims

1. A method of designing a digitized split line, characterized by, include: Obtain a three-dimensional dental model and the attachments to be added to the three-dimensional dental model; A passable area is defined on the surface of the three-dimensional dental model, and the passable area avoids the attachment. A dividing line is generated in the passable area, the dividing line extending from the first gingival line on the labial and buccal surface of the three-dimensional dental model to the second gingival line on the lingual surface.

2. The design method according to claim 1, characterized in that, The design method includes: Determine the target area where the dividing line is located, the target area including multiple teeth; Select a tooth that meets a first condition from among the plurality of teeth as the target tooth. The first condition includes that the area of ​​the passable region of the target tooth is not less than the area of ​​the passable region of the other teeth. At least a partial dividing line is generated within the passable area of ​​the target tooth.

3. The design method according to claim 2, characterized in that, When the area of ​​the passable region of the target tooth is equal to the area of ​​the passable region of other teeth, the first condition further includes: the target tooth is located on the mesial side of other teeth.

4. The design method according to claim 2, characterized in that, The dividing line is entirely located within the target tooth, or the dividing line extends from the target tooth to other teeth adjacent to the target tooth.

5. The design method according to any one of claims 1-4, characterized in that, A tooth's mounting surface includes mutually spaced non-accessible and accessible areas. The mounting surface is the labial / buccal or lingual surface of the tooth. The mounting surface includes a mesial end and a distal end that are disposed opposite each other. The non-accessible areas include at least one of the following: a first peripheral area surrounding the attachment, a second peripheral area connecting the mesial end, and a third peripheral area connecting the distal end.

6. The design method according to claim 5, characterized in that, In the near-far direction, the width of the first peripheral region ranges from 0.1mm to 1mm, the width of the second peripheral region ranges from 0.1mm to 1mm, and the width of the third peripheral region ranges from 0.1mm to 1mm.

7. The design method according to claim 2, characterized in that, The design method includes: The initial position of the dividing line is determined according to the second condition, which includes at least one of the following: the number of segments, the preferred position of the dividing line, and the location of the attachment. The region including multiple teeth on both sides of the initial position is taken as the target region.

8. The design method according to claim 2, characterized in that, The design method includes: When there is an overlapping area between the first target area of ​​the first dividing line and the second target area of ​​the second dividing line, the overlapping area is divided into a first part and a second part, wherein the first target area includes the first part and the second target area includes the second part.

9. The design method according to any one of claims 1-8, characterized in that, The design method includes: Select an initial point within the passable area; Establish a first plane passing through the initial point; Determine whether there is interference between the first plane and any attachment. If so, adjust the first plane to the target plane; otherwise, use the first plane as the target plane. The boundary line between the target plane and the surface of the three-dimensional dental model is used as the dividing line.

10. The design method according to claim 9, characterized in that, The first plane is perpendicular to the mesial-to-distal direction, or the first plane forms an acute angle with the mesial-to-distal direction.

11. The design method according to any one of claims 1-8, characterized in that, The design method includes: Select several key points that are spaced apart from each other within the passable area; The dividing line is formed by sequentially connecting several key points.

12. The design method according to any one of claims 1-11, characterized in that, The dividing line includes a first endpoint and a second endpoint that are disposed opposite to each other. The first endpoint is in the gingival region below the first gingival line, and the second endpoint is in the gingival region below the second gingival line.

13. A method for molding a dental appliance, characterized in that, include: The design method for digital dividing lines according to any one of claims 1-12 obtains the dividing lines; Obtain the cutting path data based on the dividing line; Obtain a dental mold with attachments and a dental appliance material fitted onto the dental mold, wherein the dental appliance material includes an attachment receiving cavity corresponding to the attachments; Based on the cutting path data, segment lines corresponding to the dividing lines are formed on the dental instrument material; Dental appliances are formed based on dental appliance materials.

14. The molding method according to claim 13, characterized in that, The molding method includes: Multiple sampling points and corresponding initial normal vectors are obtained on the dividing line; Obstacle avoidance design is performed based on multiple initial normal vectors to obtain cutting path data.

15. The molding method according to claim 14, characterized in that, The molding method includes: The infeasible region that hinders the initial normal vector is obtained using Gaussian mapping; A pathfinding algorithm is used to obtain the target normal vector that avoids the infeasible region; The cutting path data is obtained based on the multiple sampling points and the target normal vector.

16. The molding method according to claim 13, characterized in that, The molding method includes: The execution parameters of the laser device are determined based on the cutting data path. The segmented lines are formed by laser cutting according to the execution parameters.

17. The molding method according to claim 13, characterized in that, The molding method includes: Cut the dental instrument material along the first gingival line and the second gingival line; Demolding and trimming to form dental instruments.

18. A dental appliance, characterized in that, The dental appliance is obtained by the molding method of the dental appliance according to any one of claims 13-17, and the dental appliance includes an accessory receiving cavity and a segment line.

19. The dental appliance according to claim 18, characterized in that, The dental appliance is an accessory installation template or an invisible brace.

20. The dental appliance according to claim 18, characterized in that, The segmented line includes a break line and / or a weak connection line. When the segmented line is a weak connection line, different regions of the segmented line have different tear resistance.

21. An apparatus for designing digital dividing lines, characterized in that, include: The first module is used to acquire a three-dimensional dental model and attachments to be added to the three-dimensional dental model; The second module is used to determine a passable area on the surface of the three-dimensional dental model, wherein the passable area avoids the attachment; The third module is used to generate a dividing line for the passable region, the dividing line extending from the first gingival line on the labial / buccal side of the three-dimensional dental model to the second gingival line on the lingual side.

22. An electronic device, characterized in that, It includes a processor, a memory, and a communication bus, wherein the processor and the memory communicate with each other through the communication bus; The memory is used to store application programs; The processor is configured to, when executing an application stored in the memory, implement the steps of the digital dividing line design method according to any one of claims 1-12 and the steps of the dental appliance forming method according to any one of claims 13-17.

23. A storage medium having an application program stored thereon, characterized in that, When the application is executed, it implements the steps of the digital dividing line design method according to any one of claims 1-12 and the steps of the dental appliance forming method according to any one of claims 13-17.

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