CN113133842A - Method for producing three-dimensional digital model of shell-shaped dental instrument - Google Patents
Method for producing three-dimensional digital model of shell-shaped dental instrument Download PDFInfo
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- CN113133842A CN113133842A CN202010065739.6A CN202010065739A CN113133842A CN 113133842 A CN113133842 A CN 113133842A CN 202010065739 A CN202010065739 A CN 202010065739A CN 113133842 A CN113133842 A CN 113133842A
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- digital model
- dimensional digital
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- dental instrument
- tooth
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- A—HUMAN NECESSITIES
- 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
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- A—HUMAN NECESSITIES
- 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
- A61C7/08—Mouthpiece-type retainers or positioners, e.g. for both the lower and upper arch
Abstract
One aspect of the present application provides a method of generating a three-dimensional digital model of a shell-like dental instrument, comprising: acquiring a three-dimensional digital model of a tooth; and generating a shell-shaped dental appliance three-dimensional model by performing a wrapping operation on the three-dimensional digital model of the tooth, so that the inner surface of the shell-shaped dental appliance three-dimensional digital model can wrap the tooth and the gap between the teeth in the three-dimensional digital model of the tooth.
Description
Technical Field
The present application relates generally to methods of generating three-dimensional digital models of shell-like dental instruments.
Background
Shell-like dental instruments (e.g., shell appliances, shell holders, etc.) based on polymeric materials are becoming increasingly popular for their aesthetic, convenience, and cleaning benefits.
The conventional method for manufacturing the shell-shaped dental instrument is based on a hot-press molding process, however, the limitations of the process itself impose limitations on various aspects of the shell-shaped dental instrument.
With the development and maturity of 3D printing technology, the shell-shaped dental instrument can be manufactured by the technology, and hopes are brought for breaking through the limitation of the hot-pressing film process. To fabricate a shell-shaped dental instrument with 3D printing techniques, a three-dimensional digital model of the shell-shaped dental instrument needs to be obtained first. Therefore, there is a need for a method of generating a three-dimensional digital model of a shell-like dental instrument.
Disclosure of Invention
One aspect of the present application provides a method of generating a three-dimensional digital model of a shell-like dental instrument, comprising: acquiring a three-dimensional digital model of a tooth; and generating a shell-shaped dental appliance three-dimensional model by performing a wrapping operation on the three-dimensional digital model of the tooth, so that the inner surface of the shell-shaped dental appliance three-dimensional digital model can wrap the tooth and the gap between the teeth in the three-dimensional digital model of the tooth.
In some embodiments, for any of the interdental spaces, the inner surface fills at most only a portion thereof.
In some embodiments, the method for generating a three-dimensional digital model of a shell-like dental instrument may further comprise: generating an inner surface of the three-dimensional digital model of the shell-like dental appliance by performing a wrapping operation on the three-dimensional digital model of the tooth; generating an outer surface of the three-dimensional digital model of the shell-like dental appliance based on the three-dimensional digital model of the tooth; and generating a three-dimensional digital model of the shell-like dental instrument based on the inner and outer surfaces.
In some embodiments, the method for generating a three-dimensional digital model of a shell-like dental instrument may further comprise: and generating a first three-dimensional digital model wrapping the three-dimensional digital model of the tooth, and taking the part of the surface of the first three-dimensional digital model corresponding to the dental crown as the inner surface of the shell-shaped dental instrument three-dimensional digital model.
In some embodiments, the method for generating a three-dimensional digital model of a shell-like dental instrument may further comprise: and outwardly expanding a predetermined distance along the normal direction based on the first three-dimensional digital model, generating a second three-dimensional digital model, and taking the part of the surface of the second three-dimensional digital model corresponding to the dental crown as the outer surface of the shell-shaped dental instrument three-dimensional digital model.
In some embodiments, the method for generating a three-dimensional digital model of a shell-like dental instrument may further comprise: generating the shell-like dental instrument three-dimensional digital model using the surface of the first three-dimensional digital model and the surface of the second three-dimensional digital model.
In some embodiments, the shell-like dental instrument three-dimensional digital model is for fabricating a shell-like dental instrument using 3D printing techniques.
Drawings
The above-described and other features of the present disclosure will become more fully apparent from the following description and appended claims, taken in conjunction with the accompanying drawings. It is appreciated that these drawings depict only several embodiments of the disclosure and are therefore not to be considered limiting of its scope, for the disclosure will be described with additional specificity and detail through use of the accompanying drawings.
FIG. 1 is a schematic flow chart of a method of generating a three-dimensional digital model of a shell-like dental instrument in one embodiment of the present application;
FIG. 2A schematically illustrates an inner surface of a three-dimensional digital model of a shell-like dental implement in one embodiment of the present application;
FIG. 2B schematically illustrates the relationship between the inner surface of the three-dimensional digital model of the shell-like dental implement and the three-dimensional digital model of the tooth according to an embodiment of the present application;
FIG. 3A illustrates an interface for wrapping a three-dimensional digital model of a tooth using Materialise 3-matic software in accordance with one embodiment of the present application; and
FIG. 3B shows an interface of a closed surface obtained by a wrapping operation of a three-dimensional digital model of a tooth using Materialise 3-matic software according to an embodiment of the present application.
Detailed Description
In the following detailed description, reference is made to the accompanying drawings, which form a part hereof. In the drawings, like reference numerals generally refer to like parts throughout the various views unless the context dictates otherwise. The illustrative embodiments described in the detailed description, drawings, and claims are not meant to be limiting. Other embodiments may be utilized, and other changes may be made, without departing from the spirit or scope of the subject matter described herein. It should be readily understood that the aspects of the present disclosure, as generally described herein, and illustrated in the figures, can be arranged, substituted, combined, designed in a wide variety of different configurations, all of which are explicitly contemplated and make part of this disclosure.
To overcome the limitations of the conventional thermoforming process on various aspects of the shell-shaped dental instrument, the inventors of the present application developed a method of generating a three-dimensional digital model of the shell-shaped dental instrument, enabling the shell-shaped dental instrument to be fabricated based on 3D printing techniques.
Shell-like dental appliances are integral shell-like and form a cavity for receiving a tooth, typically with a geometry that substantially matches a particular arrangement of teeth.
In one embodiment, the shell-like dental appliance may be a shell-like appliance having a geometry such that it can reposition teeth from a first configuration to a second configuration using the elastic forces created by the deformation. In yet another embodiment, the shell-like dental instrument may be a shell-like retainer for retaining teeth in a desired arrangement.
Referring to FIG. 1, a schematic flow chart of a method 100 for generating a three-dimensional digital model of a shell-like dental instrument in one embodiment of the present application is shown.
In 101, a three-dimensional digital model of a tooth is acquired.
In one embodiment, the three-dimensional digital model of the teeth may be a file in STL (stereolithography) format. The STL file format is an interface protocol established by 3D SYSTEMS in 1988, and is a three-dimensional graphics file format that serves rapid prototyping technology. The STL file is comprised of a plurality of definitions of triangle patches, each of which includes three-dimensional coordinates of each vertex of the triangle and a normal vector of the triangle patch. The STL model is essentially a three-dimensional body bounded by closed surfaces. The following examples will be described taking the STL model as an example. It will be appreciated in light of the present application that the three-dimensional digital model of the tooth may be expressed in terms of patches other than triangular patches, for example, quadrilateral patches, etc.
In one embodiment, the shell dental appliance may be a shell appliance and the three-dimensional digital model of teeth used to generate the three-dimensional digital model of the shell dental appliance may be a three-dimensional digital model of dentition (e.g., maxillary dentition or mandibular dentition) in a target layout corresponding to the step of the appliance. In yet another embodiment, the shell-like dental appliance may be a shell-like holder and the three-dimensional digital model of the teeth may be a three-dimensional digital model of the dentition (e.g., maxillary or mandibular dentition) in a desired arrangement.
The shell-shaped appliance is used for orthodontic correction, generally, correction is divided into a plurality of successive correction steps (for example, 20-40 successive correction steps), and each correction step corresponds to one shell-shaped appliance and is used for repositioning teeth from an initial layout of the correction step to a target layout of the correction step.
In one embodiment, the shell appliance may be fabricated based on a three-dimensional digital model of the dentition under the target layout corresponding to the corrective step.
In one embodiment, a target layout for a series of successive corrective steps can be generated based on a three-dimensional digital model of the dentition under the original layout prior to orthodontic treatment.
In one embodiment, a three-dimensional digital model of the dentition in the original layout may be obtained by directly scanning the patient's dental jaws. In yet another embodiment, a three-dimensional digital model of the dentition in the original layout may be obtained by scanning a solid model, such as a plaster model, of the patient's dental jaw. In yet another embodiment, a three-dimensional digital model of the dentition in the original layout may be obtained by scanning the bites of the patient's jaws.
In one embodiment, after the three-dimensional digital model of the dentition in the original layout is obtained, it may be segmented such that the teeth in the three-dimensional digital model are independent of each other, thereby enabling individual movement of each tooth.
In one embodiment, a series of successive intermediate layouts, i.e., a series of successive orthodontic step target layouts, may be generated based on the original layout and the desired layout.
In one embodiment, a three-dimensional digital model of the dentition in the desired layout may be obtained based on the segmented three-dimensional digital model of the dentition in the original layout.
In one embodiment, the three-dimensional digital model of the dentition in the segmented original layout may be manually manipulated to move each tooth to a desired position to obtain the three-dimensional digital model of the dentition in the desired layout. In yet another embodiment, a three-dimensional digital model of the dentition in the desired layout may be obtained using a computer by automatically moving each tooth to the desired position based on the three-dimensional digital model of the dentition in the segmented original layout.
In one embodiment, after obtaining the original layout and the desired layout, interpolation may be performed based on both to obtain a series of successive targeted layouts for the correction step.
In yet another embodiment, a three-dimensional digital model of the dentition under the original layout can be manually manipulated to directly obtain a target layout for a series of successive corrective steps.
In yet another embodiment, a computer may be used to automatically generate a series of successive orthodontic step target layouts based on a three-dimensional digital model of the dentition under the original layout using a particular method (e.g., a spatial search method).
In 103, an inner surface of the three-dimensional digital model of the shell-like dental appliance is generated based on the three-dimensional digital model of the tooth.
Referring to fig. 2A, an inner surface 200 of a three-dimensional digital model of a shell-like dental implement in one embodiment of the present application is schematically illustrated. In one embodiment, the internal surface 200 of the shell-like dental appliance may be roughly divided into three portions according to the different portions of the tooth surface to which it corresponds: a labial portion 201, a lingual portion 203, and an occlusal portion 205.
In many cases, if the outer surface of the three-dimensional digital model of the tooth is directly used as the inner surface of the three-dimensional digital model of the shell-shaped dental appliance, the gap between the teeth will be filled by the entity formed in the cavity of the shell-shaped dental appliance made based on the inner surface and spanning between the buccal part and the lingual part of the inner surface of the shell-shaped dental appliance, which may make the shell-shaped dental appliance difficult to wear or even impossible to wear.
Thus, in one embodiment, a continuous surface that can wrap around all teeth and interdental spaces can be created based on the three-dimensional digital model of the teeth as the inner surface of the three-dimensional digital model of the shell-like dental appliance. By controlling the stiffness or curvature of the portion of the surface that overlies the interproximal spaces between the teeth, the depth of the surface into the spaces is controlled so that for the portion of each tooth that is in close proximity to the adjacent tooth (for two adjacent teeth where a space exists, the portion of the two teeth that are in the space), the surface contacts at most only a portion of it in an encapsulated manner, and not the entire portion in an encapsulated manner. In other words, the surface fills at most only a part of the gap between the teeth, not completely. Alternatively, the surface extends only around the periphery of the three-dimensional digital model of the tooth, which surrounds a continuous unobstructed space.
Referring to fig. 2B, a relationship between an inner surface of a three-dimensional digital model of a shell-like dental implement and a three-dimensional digital model of a tooth according to an embodiment of the present application is schematically illustrated, which is a cross-sectional view along a plane perpendicular to the Z-axis of the world coordinate system. For simplicity, this view only shows the inner surface of the three-dimensional digital model of the shell-like dental implement and a part of the three-dimensional digital model of the tooth. The inner surface 200 'wraps around the teeth 211', 213 ', and 215', and wraps around the gap 217 'between the teeth 211' and 213 'and the gap 219' between the teeth 213 'and 215'. Inner surface 200 ' does not extend through apertures 217 ' and 219 '.
In one embodiment, the three-dimensional digital model of the tooth may be "wrapped" using computer software such as Materialise 3-matic, Simpleware, HyperMesh, etc. to generate a closed surface wrapping the three-dimensional digital model of the tooth, which may be used as the inner surface of the three-dimensional digital model of the shell-like dental appliance.
Referring to FIG. 3A, an interface for a wrapping operation of a three-dimensional digital model 301 of a tooth using Materialise 3-matic software is shown in an embodiment of the present application.
Referring to FIG. 3B, there is shown an enclosed surface 303 obtained after a wrapping operation is performed on a three-dimensional digital model 301 of a tooth using Materialise 3-matic software in one embodiment of the present application.
In some cases, a missing tooth is present in the dentition. In one embodiment, virtual teeth or correspondingly shaped entities may be added to the original three-dimensional digital model of the teeth (three-dimensional digital model of dentition where missing teeth exist) at the location of the missing teeth to fill the missing teeth. Then, an inner surface of the three-dimensional digital model of the shell-like dental appliance is generated based on the three-dimensional digital model of the tooth completing the vacancy.
In 105, an outer surface of the shell-like dental instrument three-dimensional digital model is generated.
In one embodiment, the outer surface of the shell-like dental instrument may be obtained by outwardly expanding a predetermined distance (i.e., a predetermined thickness of the shell-like dental instrument) in a normal direction based on the inner surface of the shell-like dental instrument using computer software such as Materialise 3-matic, Geomagic, meslab, and HyperMesh.
The function and performance of the shell-like dental instrument is mainly determined by the geometry of its inner surface, and therefore, the outer surface of the three-dimensional digital model of the shell-like dental instrument may be generated by other methods than the method generated by flaring the inner surface by a predetermined distance. In one embodiment, the flared outer surface may be smoothed so that the transition is more gradual throughout. In yet another embodiment, a gentle arc may be generated as the outer surface of the three-dimensional digital model of the shell-like dental appliance by setting a minimum thickness based on the inner surface of the three-dimensional digital model of the shell-like dental appliance or the surface of the three-dimensional digital model of the tooth. A smoother, more gradual outer surface reduces the incidence of stress concentrations and helps to improve the mechanical properties of the shell-like dental instrument.
In 107, a three-dimensional digital model of the shell-like dental instrument is generated based on the inner and outer surfaces of the three-dimensional digital model of the shell-like dental instrument.
In one embodiment, where the inner and outer surfaces of the three-dimensional digital model of the shell-like dental instrument are part of two closed surfaces (e.g., STL models), respectively, a new closed surface, i.e., a three-dimensional digital model of the shell-like dental instrument, may be created based on the inner and outer surfaces.
The following is a brief description of the process, taking the operation in the Geomagic software as an example: firstly, turning the normal of the inner surface; then, creating a separate object in conjunction with the inner and outer surfaces; then, connecting the partial positions between the inner surface and the outer surface in a "bridging" operation under "filling the single hole"; finally, the segments between the bridges are filled in operation with a fill "inner hole" under "fill single hole". It will be appreciated in the light of the present application that, in addition to the Geomagic software, other software may be used to generate a three-dimensional digital model of a shell-like dental instrument, e.g. HyperMesh, based on the inner and outer surfaces, but that the operation may be slightly different.
In one embodiment, after the shell-shaped dental appliance three-dimensional digital model is obtained, the shell-shaped dental appliance can be cut to remove the redundant part of the edge, so that the shell-shaped appliance made of the shell-shaped dental appliance can be directly used without cutting the edge of the shell-shaped appliance.
In one embodiment, the edges of the three-dimensional digital model of the shell-like dental implement may be treated to eliminate sharp portions and round them, thereby preventing damage to the soft tissue of the patient while the shell-like dental implement is worn.
After obtaining the shell-like dental instrument three-dimensional digital model (e.g., STL model), it may be used to control a 3D printing device to fabricate the shell-like dental instrument. Currently, 3D printing devices suitable for making shell-like dental instruments include Stereolithography (SLA) devices (such as those provided by 3D Systems, inc.), Digital Light Processing (DLP) devices (such as those provided by Envision TEC, inc.), and polymer jet (PolyJet) devices (such as those provided by Stratasys, inc.), among others.
While various aspects and embodiments of the disclosure are disclosed herein, other aspects and embodiments of the disclosure will be apparent to those skilled in the art from consideration of the specification. The various aspects and embodiments disclosed herein are for purposes of illustration only and are not intended to be limiting. The scope and spirit of the application are to be determined only by the claims appended hereto.
Likewise, the various diagrams may illustrate an exemplary architecture or other configuration of the disclosed methods and systems that is useful for understanding the features and functionality that may be included in the disclosed methods and systems. The claimed subject matter is not limited to the exemplary architectures or configurations shown, but rather, the desired features can be implemented using a variety of alternative architectures and configurations. In addition, to the extent that flow diagrams, functional descriptions, and method claims do not follow, the order in which the blocks are presented should not be limited to the various embodiments which perform the recited functions in the same order, unless the context clearly dictates otherwise.
Unless otherwise expressly stated, the terms and phrases used herein, and variations thereof, are to be construed as open-ended as opposed to limiting. In some instances, the presence of an extensible term or phrases such as "one or more," "at least," "but not limited to," or other similar terms should not be construed as intended or required to imply a narrowing in instances where such extensible terms may not be present.
Claims (7)
1. A method of generating a three-dimensional digital model of a shell-like dental instrument, comprising:
acquiring a three-dimensional digital model of a tooth; and
and generating a shell-shaped dental appliance three-dimensional model by performing a wrapping operation on the three-dimensional digital model of the tooth, so that the inner surface of the shell-shaped dental appliance three-dimensional digital model can wrap the tooth and the gap between the teeth in the three-dimensional digital model of the tooth.
2. A method of producing a three-dimensional digital model of a shell-like dental instrument as claimed in claim 1, wherein for any of said interdental spaces, said inner surface fills at most only a part thereof.
3. A method of producing a three-dimensional digital model of a shell-like dental instrument as in claim 1, further comprising:
generating an inner surface of the three-dimensional digital model of the shell-like dental appliance by performing a wrapping operation on the three-dimensional digital model of the tooth;
generating an outer surface of the three-dimensional digital model of the shell-like dental appliance based on the three-dimensional digital model of the tooth; and
generating a three-dimensional digital model of the shell-like dental instrument based on the inner and outer surfaces.
4. A method of producing a three-dimensional digital model of a shell-like dental instrument as in claim 3, further comprising: and generating a first three-dimensional digital model wrapping the three-dimensional digital model of the tooth, and taking the part of the surface of the first three-dimensional digital model corresponding to the dental crown as the inner surface of the shell-shaped dental instrument three-dimensional digital model.
5. A method of producing a three-dimensional digital model of a shell-like dental instrument as in claim 4, further comprising: and outwardly expanding a predetermined distance along the normal direction based on the first three-dimensional digital model, generating a second three-dimensional digital model, and taking the part of the surface of the second three-dimensional digital model corresponding to the dental crown as the outer surface of the shell-shaped dental instrument three-dimensional digital model.
6. A method of producing a three-dimensional digital model of a shell-like dental instrument as in claim 5, further comprising: generating the shell-like dental instrument three-dimensional digital model using the surface of the first three-dimensional digital model and the surface of the second three-dimensional digital model.
7. A method of producing a three-dimensional digital model of a shell-like dental instrument according to claim 1, wherein the three-dimensional digital model of a shell-like dental instrument is used to fabricate a shell-like dental instrument using 3D printing techniques.
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| CN202010065739.6A CN113133842A (en) | 2020-01-20 | 2020-01-20 | Method for producing three-dimensional digital model of shell-shaped dental instrument |
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| CN202010065739.6A CN113133842A (en) | 2020-01-20 | 2020-01-20 | Method for producing three-dimensional digital model of shell-shaped dental instrument |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2024022002A1 (en) * | 2022-07-29 | 2024-02-01 | 上海时代天使医疗器械有限公司 | Method for generating cutting line of shell-shaped dental device |
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- 2020-01-20 CN CN202010065739.6A patent/CN113133842A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2024022002A1 (en) * | 2022-07-29 | 2024-02-01 | 上海时代天使医疗器械有限公司 | Method for generating cutting line of shell-shaped dental device |
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