CN110916821A - Preparation method of invisible appliance based on 3D printing - Google Patents
Preparation method of invisible appliance based on 3D printing Download PDFInfo
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- CN110916821A CN110916821A CN201911268672.XA CN201911268672A CN110916821A CN 110916821 A CN110916821 A CN 110916821A CN 201911268672 A CN201911268672 A CN 201911268672A CN 110916821 A CN110916821 A CN 110916821A
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- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61C—DENTISTRY; APPARATUS OR METHODS FOR ORAL OR DENTAL HYGIENE
- A61C7/00—Orthodontics, i.e. obtaining or maintaining the desired position of teeth, e.g. by straightening, evening, regulating, separating, or by correcting malocclusions
- A61C7/002—Orthodontic computer assisted systems
Abstract
The invention discloses a preparation method of an invisible appliance based on 3D printing, which comprises the following steps: s1) obtaining a dental crown model and a dental root model of the tooth according to the oral cavity CT image; s2) acquiring tooth data of the oral cavity of the patient and converting the tooth data into three-dimensional model parameter data; s3) carrying out registration and fusion processing on the CT image data and the three-dimensional scanning data to obtain a complete tooth three-dimensional model; s4), generating a series of digital tooth arrangement three-dimensional models according to the tooth three-dimensional models by adopting orthodontic treatment tooth arrangement software; s5) printing a series of photocuring tooth arrangement models by using a 3D printing technology; s6) pressing the invisible appliance on the photocuring tooth arrangement model by using a high polymer plastic film; s7) taking out the invisible appliance and carrying out trimming and grinding treatment. According to the invention, by fusing CT data and three-dimensional scanning data, the designed correction scheme is more accurate, the correction precision and efficiency are greatly improved, the dependence on manpower is reduced, and the correction effect is more stable.
Description
Technical Field
The invention relates to a preparation method of an invisible appliance, in particular to a preparation method of an invisible appliance based on 3D printing.
Background
With the improvement of the quality of life, people pay more and more attention to the beauty of teeth, and the orthodontic treatment technology is gradually accepted by people. The traditional orthodontic treatment adopts a fixed appliance which is formed by matching a nickel-titanium alloy arch wire and a metal bracket, and the appliance can well achieve the treatment effect but is not beautiful and comfortable.
At present, in the field of tooth orthodontics, an invisible appliance is convenient due to beauty and comfort, gradually replaces a traditional metal wire bracket appliance, and is more and more popular with patients and doctors. The invisible appliance is mostly made by adopting a positive pressure film pressing forming technology. For one case, it is often necessary to design a final tooth layout after correction from the original tooth layout by computer software. The current correction scheme depends on the technical level of designers, so that the final correction effect is greatly different, and the treatment effect is unstable. In the field of oral correction, in the traditional treatment process, a dental physical model is the main basis for mismalformation diagnosis, treatment scheme planning and appliance design of doctors, but the dental physical model only comprises a crown part and lacks of three-dimensional information of a tooth root and a jaw bone, so that the axes of impacted teeth and embedded teeth with partial or no crown eruption cannot be determined.
Disclosure of Invention
The invention aims to solve the technical problem of providing a preparation method of a 3D printing-based invisible corrector, which can greatly improve the correction precision and efficiency, reduce the dependence on manpower and ensure more stable correction effect.
The invention adopts the technical scheme that a preparation method of the invisible appliance based on 3D printing is provided for solving the technical problems, and comprises the following steps: s1) obtaining a dental crown model and a dental root model of the tooth according to the oral cavity CT image; s2) acquiring tooth data of the oral cavity of the patient and converting the tooth data into three-dimensional model parameter data; s3) carrying out registration and fusion processing on the CT image data and the three-dimensional scanning data to obtain a complete tooth three-dimensional model; s4), adopting orthodontic treatment tooth arrangement software, and generating a series of digital tooth arrangement three-dimensional models according to the obtained tooth three-dimensional models; s5) printing a series of photocuring tooth arrangement models by using a 3D printing technology; s6) pressing the invisible appliance on the photocuring tooth arrangement model by using a high polymer plastic film; s7) taking out the invisible appliance and carrying out trimming and grinding treatment.
Further, the step S1) includes: s11) acquiring an oral cavity CT image, and intercepting a target area, wherein the target area is a rectangular area of teeth and complete alveolar bones; s12) extracting the tooth profile of the intercepted and processed CT image by utilizing a plurality of level set algorithms, and reconstructing the CT image into a crown part and a root part by an isosurface reconstruction technology; s13) implementing corrective automatic tooth arrangement using a computer algorithm.
Further, the step S12 introduces a second order factor into the level set algorithm to make the level set function smoother, thereby reducing the gradient.
Further, the step S2 is to scan the oral cavity plaster model by using a 3D scanner or to scan the oral cavity teeth data of the patient and convert the data into three-dimensional model parameter data.
Further, in step S3, registration fusion is performed and the data of the crown and root model generated from the CT image is reconstructed into a reference three-dimensional model for correction, using the three-dimensional model parameter data generated from the scan as floating data.
Further, in step S5, the digitized tooth arrangement three-dimensional model data is input to a three-dimensional printer in STL format, and a series of tooth arrangement models for correction are printed by photocuring.
Further, the orthodontic automatic tooth arrangement process in the step S13 includes fitting an arch curve by using a β function and establishing a mathematical model for planning a tooth movement path, separating teeth from each other to form independent bodies and dispersing continuous movement of each tooth to jump a series of points during automatic tooth arrangement, dividing the path into m movement stages according to the points, translating and/or rotating the fitted arch curve during orthodontic treatment to enable the sum of tooth translation paths and the sum of rotation angles to be minimum during orthodontic treatment of n teeth, and performing collision detection during the translation and/or rotation
Compared with the prior art, the invention has the following beneficial effects: according to the preparation method of the invisible appliance based on 3D printing, provided by the invention, the three-dimensional information of the tooth root and the jaw bone is increased by fusing the CT data and the three-dimensional scanning data, so that the designed correction scheme is more accurate, the correction precision and efficiency can be greatly improved, the dependence on manpower is reduced, and the correction effect is more stable.
Drawings
Fig. 1 is a schematic view of a process for preparing the invisible orthotic based on 3D printing according to the present invention.
Detailed Description
The invention is further described below with reference to the figures and examples.
Fig. 1 is a schematic view of a process for preparing the invisible orthotic based on 3D printing according to the present invention.
Referring to fig. 1, the method for manufacturing the invisible appliance based on 3D printing according to the present invention includes the following steps:
s1) obtaining a dental crown model and a dental root model of the tooth according to the oral cavity CT image;
s2) acquiring tooth data of the oral cavity of the patient and converting the tooth data into three-dimensional model parameter data;
s3) carrying out registration and fusion processing on the CT image data (including a crown part and a root part) and the three-dimensional scanning data to obtain a complete tooth three-dimensional model;
s4), adopting orthodontic treatment tooth arrangement software, and generating a series of digital tooth arrangement three-dimensional models according to the obtained tooth three-dimensional models;
s5) printing a series of photocuring tooth arrangement models by using a 3D printing technology;
s6) pressing the invisible appliance on the photocuring tooth arrangement model by using a high polymer plastic film;
s7) taking out the invisible appliance and carrying out trimming and grinding treatment.
The preparation method of the invisible appliance based on 3D printing provided by the invention has the following advantages:
1. after three-dimensional reconstruction is carried out by fusing the three-dimensional model data and the CT data, the three-dimensional model data of the oral cavity is compared, the three-dimensional information of the tooth root and the jaw bone is increased, the designed correction scheme is more accurate, and the correction effect is ensured.
2. The AI self-learning capability is adopted in the design software, perfect cases are input in a large number in the early stage, the software can learn by self according to the cases and can automatically generate a correction scheme, along with the continuous increase of a case base, the software is more intelligent, the correction efficiency is improved, the dependence on manpower is reduced, and the correction effect is more stable.
A complete example is given below:
step 1: and acquiring an oral cavity CT image, and intercepting a target region, wherein the target region of interest is a rectangular region of the teeth and the complete alveolar bone.
Step 2: and (3) carrying out tooth profile extraction on the CT image processed in the step (1) by utilizing a plurality of level set algorithms. The CT image is reconstructed into a crown portion and a root portion by an iso-surface reconstruction technique. A second order factor is introduced into the level set algorithm to make the level set function smoother, thereby reducing the gradient. Function of level set
Rough spots, ▽
It is larger than 1 so that the second order factor P is large, adversely affecting the reduction of energy. The second-order factor P is a penalty term, and to minimize the desired energy, P, which is one of its summation terms, should also be small, corresponding to a smooth curve.
And step 3: and scanning the oral cavity plaster model by using a 3D scanner or scanning the oral cavity to acquire the three-dimensional graph of the teeth in the oral cavity.
And 4, step 4: and (4) registering and fusing the CT image dental crown model data in the step (3) and the three-dimensional graph obtained in the step (4), taking the dental crown model data generated by the CT image as reference data, taking the three-dimensional image data generated by scanning as floating data, and realizing data fusion and reconstruction into a reference three-dimensional model for correction through a computer algorithm.
And 5, inputting the datum three-dimensional model data for the correction of the patient, which is acquired in the step 4, into orthodontic treatment tooth arrangement software, wherein the software has artificial intelligence learning capacity, and according to a large amount of case data input in the early stage, on an ideal dental arch curve, according to a tooth arrangement principle and expert experience, the teeth are arranged by using an automatic tooth arrangement algorithm, a design scheme can be automatically output, and a series of digital tooth arrangement models are generated.
In the first step, in order to move, the teeth are separated from each other to form independent bodies, the movement of the teeth is a continuous process, the reality and the real-time property are guaranteed in the simulated tooth straightening process, so that the problem needs to be simplified, and the continuous movement of each tooth is dispersed into jumps of a series of points. The second step divides the path into m movement phases based on these points, in which the tooth is both translated and also rotated. Ensuring that the paths are optimal, and ensuring that the sum Fa of the tooth translation paths and the sum Fb of the rotation angles of n teeth are minimum in the straightening process; m and n are positive integers. The straightening process is a process of tooth movement and rotation, collision is inevitable between teeth, and therefore collision detection is indispensable. The correction process is a gradual and slow process, and the distance of each translation and the angle of rotation cannot be too large, so that the correction process needs to be limited. On an ideal dental arch curve, the teeth are arranged by using an automatic tooth arrangement algorithm according to tooth arrangement principles and expert experiences
inputting the tooth arrangement three-dimensional model data of the invisible appliance obtained in the step 5 into a three-dimensional printer in an STL format, printing a series of tooth arrangement models for correction in a photocuring mode, wherein the printing does not need to print all the series, and only needs to print the half of the models in the previous correction step.
And 7, pressing the invisible orthodontic braces on the printed tooth arrangement model by using a high polymer plastic film material in a pressing mode.
And 8, trimming and polishing the invisible orthodontic braces.
Step 9, using the invisible appliance for the patient:
the use method of the invisible orthodontic appliance prepared by the manufacturing method is that the invisible orthodontic appliances are used one by one step according to a designed step-by-step rectification scheme, and the use method is that each pair of the invisible orthodontic appliances are used for 1-2 weeks until all the invisible orthodontic appliances are used.
And 10, after half of the correction is performed step by step, restarting the steps 1-9, wherein in the actual correction, due to the difference between the ideal design and the actual correction effect, the method divides the normal correction period into two parts, and acquires the CT data and the oral cavity model data again when the correction reaches a half period, so that the whole correction scheme is more accurate and efficient.
Although the present invention has been described with respect to the preferred embodiments, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (7)
1. A preparation method of an invisible appliance based on 3D printing is characterized by comprising the following steps:
s1) obtaining a dental crown model and a dental root model of the tooth according to the oral cavity CT image;
s2) acquiring tooth data of the oral cavity of the patient and converting the tooth data into three-dimensional model parameter data;
s3) carrying out registration and fusion processing on the CT image data and the three-dimensional scanning data to obtain a complete tooth three-dimensional model;
s4), adopting orthodontic treatment tooth arrangement software, and generating a series of digital tooth arrangement three-dimensional models according to the obtained tooth three-dimensional models;
s5) printing a series of photocuring tooth arrangement models by using a 3D printing technology;
s6) pressing the invisible appliance on the photocuring tooth arrangement model by using a high polymer plastic film;
s7) taking out the invisible appliance and carrying out trimming and grinding treatment.
2. The method for manufacturing the 3D printing-based invisible orthotic of claim 1, wherein the step S1) comprises:
s11) acquiring an oral cavity CT image, and intercepting a target area, wherein the target area is a rectangular area of teeth and complete alveolar bones;
s12) extracting the tooth profile of the intercepted and processed CT image by utilizing a plurality of level set algorithms, and reconstructing the CT image into a crown part and a root part by an isosurface reconstruction technology;
s13) implementing corrective automatic tooth arrangement using a computer algorithm.
3. The method for making the 3D printing-based invisible orthotic of claim 2, wherein the step S12 introduces a second order factor into the level set algorithm to make the level set function smoother, thereby reducing the gradient.
4. The method for making the 3D printing-based invisible appliance according to claim 1, wherein the step S2 is implemented by scanning the oral plaster model with a 3D scanner or scanning the oral teeth of the patient to obtain the dental data of the oral cavity and converting the dental data into three-dimensional model parameter data.
5. The method for manufacturing the invisible appliance based on 3D printing according to claim 1, wherein the step S3 is performed by performing registration fusion and reconstruction into a reference three-dimensional model for correction using crown and root model data generated from the CT image as reference data and three-dimensional model parameter data generated from the scan as floating data.
6. The method for manufacturing the invisible appliance based on 3D printing according to claim 1, wherein the step S5 is characterized in that the digital tooth arrangement three-dimensional model data obtained is input into a three-dimensional printer in STL format, and a series of tooth arrangement models for correction are printed in a photocuring mode.
7. The method of claim 2, wherein the step S13 comprises fitting a curve of an arch with a β function and creating a mathematical model of a tooth movement path plan, wherein the automatic tooth arrangement comprises separating teeth to form independent bodies, dispersing the continuous movement of each tooth to jump a series of points, dividing the path into m movement stages according to the points, and performing translation and/or rotation on the fitted arch curve during the tooth arrangement to minimize the sum of the tooth translation paths and the sum of the rotation angles of n teeth during the tooth arrangement, and performing collision detection during the translation and/or rotation.
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| CN112172094A (en) * | 2020-09-01 | 2021-01-05 | 北京缔佳医疗器械有限公司 | Prefabricated accessory suitable for invisible orthodontic product |
| CN112890993A (en) * | 2021-01-21 | 2021-06-04 | 北京非凡禾禾医疗器械有限公司 | Preparation method of dental appliance |
| CN113171190A (en) * | 2021-05-31 | 2021-07-27 | 四川大学 | Preparation method of orthodontic appliance with tooth arrangement function |
| CN113499153A (en) * | 2021-06-09 | 2021-10-15 | 北京数字禾禾科技有限公司 | Rapid alignment method adopting transparent orthodontic mold |
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| CN113499153A (en) * | 2021-06-09 | 2021-10-15 | 北京数字禾禾科技有限公司 | Rapid alignment method adopting transparent orthodontic mold |
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Application publication date: 20200327 |