CN113442438A - Orthodontic model stacking and printing method and system - Google Patents

Orthodontic model stacking and printing method and system Download PDF

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Publication number
CN113442438A
CN113442438A CN202110672115.5A CN202110672115A CN113442438A CN 113442438 A CN113442438 A CN 113442438A CN 202110672115 A CN202110672115 A CN 202110672115A CN 113442438 A CN113442438 A CN 113442438A
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orthodontic
model
orthodontic model
stacking
models
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CN113442438B (en
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吕琳
曹令鑫
屠长河
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Shandong University
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C64/00—Additive manufacturing, i.e. manufacturing of three-dimensional [3D] objects by additive deposition, additive agglomeration or additive layering, e.g. by 3D printing, stereolithography or selective laser sintering
    • B29C64/30—Auxiliary operations or equipment
    • B29C64/386—Data acquisition or data processing for additive manufacturing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C64/00—Additive manufacturing, i.e. manufacturing of three-dimensional [3D] objects by additive deposition, additive agglomeration or additive layering, e.g. by 3D printing, stereolithography or selective laser sintering
    • B29C64/10—Processes of additive manufacturing
    • B29C64/106—Processes of additive manufacturing using only liquids or viscous materials, e.g. depositing a continuous bead of viscous material
    • B29C64/124—Processes of additive manufacturing using only liquids or viscous materials, e.g. depositing a continuous bead of viscous material using layers of liquid which are selectively solidified
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C64/00—Additive manufacturing, i.e. manufacturing of three-dimensional [3D] objects by additive deposition, additive agglomeration or additive layering, e.g. by 3D printing, stereolithography or selective laser sintering
    • B29C64/20—Apparatus for additive manufacturing; Details thereof or accessories therefor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C64/00—Additive manufacturing, i.e. manufacturing of three-dimensional [3D] objects by additive deposition, additive agglomeration or additive layering, e.g. by 3D printing, stereolithography or selective laser sintering
    • B29C64/30—Auxiliary operations or equipment
    • B29C64/386—Data acquisition or data processing for additive manufacturing
    • B29C64/393—Data acquisition or data processing for additive manufacturing for controlling or regulating additive manufacturing processes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B33—ADDITIVE MANUFACTURING TECHNOLOGY
    • B33Y—ADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3-D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3-D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING
    • B33Y10/00—Processes of additive manufacturing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B33—ADDITIVE MANUFACTURING TECHNOLOGY
    • B33Y—ADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3-D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3-D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING
    • B33Y40/00—Auxiliary operations or equipment, e.g. for material handling
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B33—ADDITIVE MANUFACTURING TECHNOLOGY
    • B33Y—ADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3-D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3-D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING
    • B33Y50/00—Data acquisition or data processing for additive manufacturing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B33—ADDITIVE MANUFACTURING TECHNOLOGY
    • B33Y—ADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3-D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3-D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING
    • B33Y50/00—Data acquisition or data processing for additive manufacturing
    • B33Y50/02—Data acquisition or data processing for additive manufacturing for controlling or regulating additive manufacturing processes
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
    • G06T19/00—Manipulating 3D models or images for computer graphics
    • G06T19/20—Editing of 3D images, e.g. changing shapes or colours, aligning objects or positioning parts

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  • Software Systems (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Dental Tools And Instruments Or Auxiliary Dental Instruments (AREA)

Abstract

The invention discloses a method and a system for stacking and printing orthodontic models, wherein the method comprises the following steps: preprocessing the orthodontic model to obtain a minimum external cuboid; obtaining the shortest distance between the midpoint of the side of the smallest external cuboid and the orthodontic model, wherein the side with the largest numerical value in the shortest distance is the side corresponding to the opening of the orthodontic model; rotating the orthodontic model to a printable position according to the side corresponding to the orthodontic model opening; and stacking the rotated orthodontic models, and supporting the regions to be supported to obtain the stacked orthodontic models. The method comprises the steps of obtaining a minimum external cuboid of the orthodontic 3D digital model, rotating the orthodontic model to the minimum external cuboid to be parallel to XYZ axes, rotating the orthodontic model for 90 degrees to be erected, arranging the orthodontic model in a stacking mode according to the size of the model, stacking the orthodontic model after supporting, enabling the orthodontic model to be arranged tightly, and not damaging tooth parts of the orthodontic model.

Description

Orthodontic model stacking and printing method and system
Technical Field
The invention relates to the technical field of 3D printing, in particular to an orthodontic model stacking and printing method and system.
Background
The statements in this section merely provide background information related to the present disclosure and may not necessarily constitute prior art.
3D printing, a rapid prototyping technology, is a technology that builds objects by layer-by-layer printing from a digital model file using bondable materials such as powdered metal or plastic. 3D printing is an additive manufacturing technique that can produce customized or more complex structured products than traditional subtractive manufacturing.
The DLP printing model has high precision, high speed and customization, so the model is increasingly widely applied to the oral cavity, and simultaneously, the demand for the orthodontic model is large, the model needs to be printed as many as possible at one time, the number of the surface patches of the model is large, the processing time is long, the model can be tightly stacked without damaging the tooth part of the orthodontic model, and the problem to be solved at present is solved.
Disclosure of Invention
In order to solve the problems, the invention provides an orthodontic model stacking and printing method and system, wherein a minimum external cuboid of an orthodontic 3D digital model is obtained, when the orthodontic model is rotated to be parallel to XYZ axes, the orthodontic model is rotated by 90 degrees to be erected, the orthodontic model is stacked and placed after being sorted according to the size from large to small, and meanwhile, stacking is completed after supporting is carried out, so that the orthodontic model is arranged tightly, and the tooth part of the orthodontic model is not damaged.
In order to achieve the purpose, the invention adopts the following technical scheme:
in a first aspect, the present invention provides an orthodontic model stacking method, comprising:
preprocessing the orthodontic model to obtain a minimum external cuboid;
obtaining the shortest distance between the midpoint of the side of the smallest external cuboid and the orthodontic model, wherein the side with the largest numerical value in the shortest distance is the side corresponding to the opening of the orthodontic model;
rotating the orthodontic model to a printable position according to the side corresponding to the orthodontic model opening;
and stacking the rotated orthodontic models, and supporting the regions to be supported to obtain the stacked orthodontic models.
As an alternative embodiment, the process of obtaining the minimum circumscribed cuboid after preprocessing the orthodontics model comprises: and rotating the orthodontic model within a 90-degree range by adopting an equal interval rotation searching method, obtaining the area of the circumscribed rectangle according to the parameters of the circumscribed rectangle of the outline of the orthodontic model in the coordinate system direction, obtaining the minimum circumscribed rectangle according to the area of the circumscribed rectangle, and obtaining the minimum circumscribed cuboid according to the minimum circumscribed rectangle.
As an alternative embodiment, the rotation process of the orthodontic model comprises: the side corresponding to the opening of the orthodontic model is rotated to the right side, the orthodontic model is rotated by 90 degrees around the y axis, so that the opening of the orthodontic model faces downwards, and a printable posture without supporting on teeth of the orthodontic model is obtained.
As an alternative embodiment, the process of stacking the rotated orthodontic models comprises: placing the orthodontic model along the positive direction of an x-axis, and if the orthodontic model exceeds the boundary of a printable area in the x-axis direction, placing the orthodontic model along the positive direction of a y-axis in the next row; if the y-axis direction exceeds the boundary of the printable area, stacking and placing are carried out; recording the number of orthodontic models placed on the first layer as k, starting from the (k + 1) th orthodontic model, and placing each model at a placing point of (x)i-k,yi-k,zi-k+hi-k) Wherein i is the ith orthodontic model, hi-kIs the height of the ith orthodontic model.
As an alternative embodiment, the determination of the area to be supported comprises: the method comprises the steps of obtaining a normal vector of the face of the orthodontic model and an included angle formed by the normal vector and a z axis, screening the faces with the included angles smaller than an angle threshold value, connecting adjacent faces into regions, and taking the first n largest regions as regions to be supported.
As an alternative embodiment, the process of adding support to the region to be supported comprises: and acquiring points to be supported by adopting a scanning line rasterization algorithm, establishing a trunk support parallel to a z axis according to the value range of the y coordinate of the points to be supported of each area to be supported, and connecting the points to be supported with the nearest trunk support at an angle of 45 degrees.
In a second aspect, the present invention provides an orthodontic model printing method, including:
stacking the orthodontic models in a printing range by adopting the orthodontic model stacking method in the first aspect;
and printing the obtained stacked orthodontic model.
In a third aspect, the present invention provides an orthodontic model stacking system comprising:
the preprocessing module is configured to preprocess the orthonormal model to obtain a minimum external cuboid;
the opening determining module is configured to obtain the shortest distance between the midpoint of the side of the smallest external rectangular solid and the orthodontic model, and the side with the largest numerical value in the shortest distance is the side corresponding to the opening of the orthodontic model;
a rotation module configured to rotate the orthodontic model to a printable position according to the side corresponding to the orthodontic model opening;
and the stacking module is configured to stack the rotated orthodontic models and obtain the stacked orthodontic models after the regions to be supported are supported.
In a fourth aspect, the present invention provides an electronic device comprising a memory and a processor, and computer instructions stored on the memory and executed on the processor, wherein when the computer instructions are executed by the processor, the method of the first aspect is performed.
In a fifth aspect, the present invention provides a computer readable storage medium for storing computer instructions which, when executed by a processor, perform the method of the first aspect.
Compared with the prior art, the invention has the beneficial effects that:
the method calculates the minimum external cuboid for the orthodontic 3D digital model to be printed, rotates the orthodontic model to the minimum external cuboid to be parallel to the XYZ axes, and stands the orthodontic model by rotating the orthodontic model by 90 degrees, so that the opening faces downwards, and the printable posture without supporting the teeth during printing is obtained, and the teeth part of the orthodontic model can not be damaged.
The orthodontic model is stacked according to the volume of the minimum external cuboid of the orthodontic 3D digital model, so that the orthodontic model is tightly arranged.
The method disclosed by the invention can be used for supporting the regions of the placed orthodontic model which need to be supported, the algorithm complexity is low, the arrangement and the support of the model can be rapidly completed without searching for the neck margin line, and the required support consumables are less.
Advantages of additional aspects of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate exemplary embodiments of the invention and together with the description serve to explain the invention and not to limit the invention.
Fig. 1 is a flowchart of an orthodontic model stacking method according to embodiment 1 of the present invention;
fig. 2 is a schematic view of a minimum circumscribed cuboid of an orthodontic model provided in example 1 of the present invention;
fig. 3 is a schematic view of corresponding edges at an opening of an orthodontic model provided in example 1 of the present invention;
FIG. 4 is a schematic view of the rotation of the orthodontic model according to embodiment 1 of the present invention
Fig. 5 is a schematic view of a stacked arrangement of orthodontic models provided in example 1 of the present invention;
fig. 6 is a graph of actual printing results provided in embodiment 2 of the present invention.
Detailed Description
The invention is further described with reference to the following figures and examples.
It is to be understood that the following detailed description is exemplary and is intended to provide further explanation of the invention as claimed. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the invention. As used herein, the singular forms "a", "an", and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise, and it should be understood that the terms "comprises" and "comprising", and any variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
The embodiments and features of the embodiments of the present invention may be combined with each other without conflict.
Example 1
As shown in fig. 1, the present embodiment provides an orthodontic model stacking method, including:
step (1): acquiring an orthodontic model, and preprocessing the orthodontic model to obtain a minimum external cuboid;
step (2): acquiring the shortest distance between the midpoint of the side of the minimum external cuboid and the orthodontic model, wherein the side with the largest numerical value in the shortest distance is the side corresponding to the opening of the orthodontic model, and rotating the orthodontic model to a printable position according to the side corresponding to the opening of the orthodontic model;
and (3): stacking the rotated orthodontic models;
and (4): and after the area to be supported is supported, obtaining the stacked orthodontic model.
In the step (1), the obtained orthodontic models are all 3D digital models with bases, but rotation, offset and the like exist, all the orthodontic models are not placed at the same angle, and the bases are generally parallel to an XOY plane, so that a minimum external cuboid can be obtained only by rotating a z axis;
specifically, sparse point acquisition is carried out on the orthodontic model, xy coordinates of the points are acquired, the orthodontic model is rotated within a 90-degree range by adopting an equal interval rotation searching method, parameters of an external rectangle of a profile in the direction of a coordinate system are recorded, and a minimum external rectangle is obtained according to the area of the external rectangle;
when the minimum external rectangle is rotated to any one side parallel to the X axis, the orthodontic model is correspondingly rotated, and the minimum external rectangle plus the height of the orthodontic model is the minimum external cuboid, as shown in figure 2.
In the step (2), the opening of the current orthodontic model may face any one side of the minimum circumscribed rectangle, so the embodiment calculates the shortest distances between the midpoints p1, p2, p3, p4 of the four sides of the minimum circumscribed rectangle and the orthodontic model by using the following formula:
Figure BDA0003119123640000061
wherein p is two points, pxIs the x coordinate of p point, pyY coordinates of p points, q points of the model, qixAs the x-coordinate of the ith point of the model, qiyIs the y coordinate of the ith point of the model.
The shortest distances between the midpoints p1, p2, p3 and p4 and the orthodontic model are d1, d2, d3 and d4 respectively, and the side with the largest value among d1, d2, d3 and d4 is the side corresponding to the orthodontic model opening, as shown in fig. 3, it can be seen that the point p1 is farthest from the tooth model, and the side corresponding to the orthodontic model opening is also the side where the point p1 is located.
The side corresponding to the opening of the orthodontic model is rotated to the right side of the rectangle, then the orthodontic model is rotated by 90 degrees around the y axis, so that the opening of the orthodontic model faces downwards, and a printable posture which does not need to be supported on teeth during printing is obtained, as shown in fig. 4.
In the step (3), the current minimum external cuboid volume of the orthodontic model is sequenced from large to small, and the orthodontic model is stacked in a printable area, specifically:
placing the orthodontic model along the positive direction of the x axis, and if the x axis exceeds the boundary of the printable area in the direction of the x axis, namely the x value is larger than the printable area, placing the orthodontic model along the positive direction of the y axis in the next row;
if the y-axis direction exceeds the boundary of the printable area, namely the y value is larger than the printable area, the stacking placement is started;
recording the number of orthodontic models placed on the first layer as k, starting from the (k + 1) th model, and placing each model at a placing point of (x)i-k,yi-k,zi-k+hi-k) Where i is the ith model, hi-kIs the height of the ith model.
In the step (4), calculating a normal vector of the orthodontic mold surface and an included angle theta formed by the normal vector and a z axis; obtaining surfaces with an included angle theta smaller than 30 degrees, connecting adjacent surface patches into areas, and taking the first n largest areas as areas to be supported;
acquiring sampling points of all the overhanging surfaces by using a scanning line rasterization algorithm, and taking the sampling points as points to be supported;
for the point to be supported in each area, according to the value range of the y coordinate of the point to be supported, y/10+1 trunk supports parallel to the z axis are established, the x axis coordinate of the trunk supports is distributed in the base area of the orthodontic model, and the y axis coordinate is uniformly distributed in the value range of y;
connecting a point to be supported of the orthodontic model with the nearest main support at an angle of 45 degrees;
for the lowermost layer, the points to be supported are attached directly to the base area to strengthen the base.
The range of printable printing of the printer used in this example was 140mm 70mm 160mm, and fig. 5 shows that 18 orthodontic models were stacked and supported in the printable range.
Example 2
The embodiment provides an orthodontic model printing method, which comprises the following steps:
stacking the orthodontic models in a printing range by adopting the orthodontic model stacking method in the embodiment 1;
the resulting stacked orthodontic model was printed, and the printing result using a DLP printer is shown in fig. 6.
Example 3
The present embodiments provide an orthodontic model stacking system comprising:
the preprocessing module is configured to preprocess the orthonormal model to obtain a minimum external cuboid;
the opening determining module is configured to obtain the shortest distance between the midpoint of the side of the smallest external rectangular solid and the orthodontic model, and the side with the largest numerical value in the shortest distance is the side corresponding to the opening of the orthodontic model;
a rotation module configured to rotate the orthodontic model to a printable position according to the side corresponding to the orthodontic model opening;
and the stacking module is configured to stack the rotated orthodontic models and obtain the stacked orthodontic models after the regions to be supported are supported.
In further embodiments, an orthodontic model printing system may also be provided, which includes the above orthodontic model stacking system and a printing module, and the printing module is configured to print the obtained stacked orthodontic models.
It should be noted that the modules correspond to the steps described in embodiment 1, and the modules are the same as the corresponding steps in the implementation examples and application scenarios, but are not limited to the disclosure in embodiment 1. It should be noted that the modules described above as part of a system may be implemented in a computer system such as a set of computer-executable instructions.
In further embodiments, there is also provided:
an electronic device comprising a memory and a processor and computer instructions stored on the memory and executed on the processor, the computer instructions when executed by the processor performing the method of embodiment 1. For brevity, no further description is provided herein.
It should be understood that in this embodiment, the processor may be a central processing unit CPU, and the processor may also be other general purpose processors, digital signal processors DSP, application specific integrated circuits ASIC, off-the-shelf programmable gate arrays FPGA or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, and so on. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like.
The memory may include both read-only memory and random access memory, and may provide instructions and data to the processor, and a portion of the memory may also include non-volatile random access memory. For example, the memory may also store device type information.
A computer readable storage medium storing computer instructions which, when executed by a processor, perform the method described in embodiment 1.
The method in embodiment 1 may be directly implemented by a hardware processor, or implemented by a combination of hardware and software modules in the processor. The software modules may be located in ram, flash, rom, prom, or eprom, registers, among other storage media as is well known in the art. The storage medium is located in a memory, and a processor reads information in the memory and completes the steps of the method in combination with hardware of the processor. To avoid repetition, it is not described in detail here.
Those of ordinary skill in the art will appreciate that the various illustrative elements, i.e., algorithm steps, described in connection with the embodiments disclosed herein may be implemented as electronic hardware or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present application.
The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes will occur to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Although the embodiments of the present invention have been described with reference to the accompanying drawings, it is not intended to limit the scope of the present invention, and it should be understood by those skilled in the art that various modifications and variations can be made without inventive efforts by those skilled in the art based on the technical solution of the present invention.

Claims (10)

1. A method of stacking orthodontic models, comprising:
preprocessing the orthodontic model to obtain a minimum external cuboid;
obtaining the shortest distance between the midpoint of the side of the smallest external cuboid and the orthodontic model, wherein the side with the largest numerical value in the shortest distance is the side corresponding to the opening of the orthodontic model;
rotating the orthodontic model to a printable posture according to the side corresponding to the orthodontic model opening;
and stacking the rotated orthodontic models, and supporting the regions to be supported to obtain the stacked orthodontic models.
2. The method for stacking orthodontic models according to claim 1, wherein the step of preprocessing the orthodontic models to obtain the smallest circumscribed cuboid comprises the steps of: and rotating the orthodontic model within a 90-degree range by adopting an equal interval rotation searching method, obtaining the area of the circumscribed rectangle according to the parameters of the circumscribed rectangle of the outline of the orthodontic model in the coordinate system direction, obtaining the minimum circumscribed rectangle according to the area of the circumscribed rectangle, and obtaining the minimum circumscribed cuboid according to the minimum circumscribed rectangle.
3. The method of stacking orthodontic models of claim 1, wherein the rotation of the orthodontic models comprises: the side corresponding to the opening of the orthodontic model is rotated to the right side, the orthodontic model is rotated by 90 degrees around the y axis, so that the opening of the orthodontic model faces downwards, and a printable posture without supporting on teeth of the orthodontic model is obtained.
4. The method of claim 1, wherein the orthodontic model is stackedThe process of stacking the rotated orthodontic models comprises the following steps: placing the orthodontic model along the positive direction of an x-axis, and if the orthodontic model exceeds the boundary of a printable area in the x-axis direction, placing the orthodontic model along the positive direction of a y-axis in the next row; if the y-axis direction exceeds the boundary of the printable area, stacking and placing are carried out; recording the number of orthodontic models placed on the first layer as k, starting from the (k + 1) th orthodontic model, and placing each model at a placing point of (x)i-k,yi-k,zi-k+hi-k) Wherein i is the ith orthodontic model, hi-kIs the height of the ith orthodontic model.
5. The method of stacking orthodontic models of claim 1, wherein the determination of the area to be supported comprises: the method comprises the steps of obtaining a normal vector of the face of the orthodontic model and an included angle formed by the normal vector and a z axis, screening the faces with the included angles smaller than an angle threshold value, connecting adjacent faces into regions, and taking the first n largest regions as regions to be supported.
6. The method of stacking orthodontic models of claim 1, wherein the process of supporting the area to be supported comprises: and acquiring points to be supported by adopting a scanning line rasterization algorithm, establishing a trunk support parallel to a z axis according to the value range of the y coordinate of the points to be supported of each area to be supported, and connecting the points to be supported with the nearest trunk support at an angle of 45 degrees.
7. An orthodontic model printing method, comprising:
stacking the orthodontic models by using the orthodontic model stacking method of any one of claims 1 to 6 within a printing range;
and printing the obtained stacked orthodontic model.
8. An orthodontic model stacking system, comprising:
the preprocessing module is configured to preprocess the orthonormal model to obtain a minimum external cuboid;
the opening determining module is configured to obtain the shortest distance between the midpoint of the side of the smallest external rectangular solid and the orthodontic model, and the side with the largest numerical value in the shortest distance is the side corresponding to the opening of the orthodontic model;
a rotation module configured to rotate the orthodontic model to a printable position according to the side corresponding to the orthodontic model opening;
and the stacking module is configured to stack the rotated orthodontic models and obtain the stacked orthodontic models after the regions to be supported are supported.
9. An electronic device comprising a memory and a processor and computer instructions stored on the memory and executed on the processor, the computer instructions when executed by the processor performing the method of any of claims 1-6.
10. A computer-readable storage medium storing computer instructions which, when executed by a processor, perform the method of any one of claims 1 to 6.
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