KR20230053748A - System and method for manufactoring metal frame for dentures based on 3d printing - Google Patents

Abstract

The present invention relates to a method for manufacturing a metal frame for dentures based on 3D printing technology, which includes the steps of: scanning a patient's oral impression model with a 3D scanner to generate 3D data; designing a 3D frame using the 3D data; printing the designed 3D frame as a 3D resin frame through a 3D printer; installing a sprue wire on the printed 3D resin frame; and manufacturing a metal frame from the 3D resin frame on which the sprue wire is installed.

Description

Method and system for manufacturing metal frames for dentures based on 3D printing technology {SYSTEM AND METHOD FOR MANUFACTORING METAL FRAME FOR DENTURES BASED ON 3D PRINTING}

The present invention relates to a method and system for manufacturing a metal frame for dentures based on 3D printing technology. More specifically, it relates to a manufacturing method and control system using a 3D scanner and a 3D printer as an improved method of a metal frame of cobalt-chrome material for casting included in a denture.

BACKGROUND ART In general, dentures are often used as one of artificial prostheses in the field of dentistry. Dentures, also called dentures, are prosthetic implants that artificially restore the shape and function of missing teeth when natural teeth are lost. Dentures have weaker chewing power than natural teeth, so they are inconvenient to eat, but they are relatively inexpensive and can be used even when all teeth are missing.

Dentures are generally composed of a metal framework, a resin base, and artificial teeth (replacement teeth). The conventional metal frame is manufactured manually by a worker. However, such manual work is, for example, the process of making a fire-resistant model for the manufacture of a metal frame by pasting the patient's oral impression model with undercut blockout and relief wax, the process of making a wax frame in the shape of a metal frame by applying wax to the fire-resistant model, It consists of many manual processes such as injecting investment material into a fire-resistant model with a wax frame, hardening it, burning out at high temperature and casting, and requires 7 to 8 hours of work time, so productivity is low. There is a problem in that it is difficult to manufacture accurate dentures tailored to the patient, in which the accuracy of dentures varies depending on the manufacturer's experience and career, and the condition of the day.

Patent Document: Korean Patent Publication No. 10-2020-0017565 (published on February 19, 2020)

The present invention is to solve the above-mentioned problems of the prior art, it is possible to manufacture a metal frame for dentures using a 3D scanner and a 3D printer.

In addition, by using a 3D scanner and a 3D printer instead of manual work, the production time can be shortened.

In addition, by collecting oral impressions of various patients as 3D data, it is possible to increase the manufacturing accuracy of metal frames for dentures by using them as big data.

In addition, it is possible to manufacture a metal frame with a higher degree of conformity than a cast body model manufactured by hand.

One embodiment of the present invention relates to a method for manufacturing a metal frame for dentures, comprising: generating 3D data by scanning an oral impression model of a patient with a 3D scanner; Designing a 3D frame using the 3D data; outputting the designed 3D frame as a 3D resin frame through a 3D printer; installing a sprue wire on the output 3D resin frame; and manufacturing a metal frame from the 3D resin frame in which the sprue wire is installed.

In addition, the manufacturing of the metal frame may include manufacturing a cast body by burying the 3D resin frame in which the sprue wire is installed in an investment material; and injecting molten metal into an inner space of the cast body by heating the cast body to burn out the 3D resin frame.

Preferably, the step of polishing the metal frame for dentures formed of the molten metal may be further included.

Preferably, the molten metal is a cobalt-chromium (CoCr) material.

Another embodiment of the present invention relates to a system for manufacturing a metal frame for dentures, comprising: a 3D scanner for generating 3D data by scanning an oral impression model of a patient; a design unit for designing a 3D frame and generating 3D frame data using the 3D data; a 3D printer outputting the 3D frame data generated by the design unit as a 3D resin frame; and a metal frame manufacturing unit for manufacturing a metal frame from the 3D resin frame.

According to the present invention, it is possible to manufacture a metal frame for dentures using a 3D scanner and a 3D printer.

In addition, by using a 3D scanner and a 3D printer instead of manual work, the production time can be shortened.

In addition, by collecting oral impressions of various patients as 3D data, it is possible to improve the manufacturing accuracy of metal frames for dentures by using them as big data.

In addition, it is possible to manufacture a metal frame with a higher degree of conformity than a cast body model manufactured by hand.

In addition, through a 3D printer, it is possible to manufacture printed dentures, metal cores of general prostheses, and mouth guards.

1 is a view conceptually showing a system for manufacturing a metal frame for dentures according to an example of the present invention.
2 is a view showing an oral impression model of a patient according to an embodiment of the present invention.
3 is a view showing a process for manufacturing a metal frame for dentures according to an example of the present invention.
4 is a diagram illustrating 3D scanning according to an embodiment of the present invention.
5 is a diagram showing a 3D scanning image according to an embodiment of the present invention.
6 is a diagram showing a design for 3D printing according to an embodiment of the present invention.
7 is a view of outputting a resin frame from a 3D printer according to an embodiment of the present invention.
8 is a view showing a process of manufacturing a metal frame according to an embodiment of the present invention.
9 is a view showing a metal frame manufactured according to an embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in detail so that those skilled in the art can easily practice the present invention with reference to the accompanying drawings. However, the present invention may be embodied in many different forms and is not limited to the embodiments described herein. And in order to clearly explain the present invention in the drawings, parts irrelevant to the description are omitted, and similar reference numerals are attached to similar parts throughout the specification.

Throughout the specification, when a part is said to be "connected" to another part, this includes not only the case where it is "directly connected" but also the case where it is "electrically connected" with another element interposed therebetween. . In addition, when a certain component is said to "include", this means that it may further include other components without excluding other components unless otherwise stated.

In this specification, a "unit" includes a unit realized by hardware, a unit realized by software, and a unit realized using both. Further, one unit may be realized using two or more hardware, and two or more units may be realized by one hardware. On the other hand, '~ unit' is not limited to software or hardware, and '~ unit' may be configured to be in an addressable storage medium or configured to reproduce one or more processors. Therefore, as an example, '~unit' refers to components such as software components, object-oriented software components, class components, and task components, processes, functions, properties, and procedures. , subroutines, segments of program code, drivers, firmware, microcode, circuitry, data, databases, data structures, tables, arrays and variables. Functions provided within components and '~units' may be combined into smaller numbers of components and '~units' or further separated into additional components and '~units'. In addition, components and '~units' may be implemented to play one or more CPUs in a device or a secure multimedia card.

A “user terminal” referred to below may be implemented as a computer or portable terminal capable of accessing a server or other terminals through a network. Here, the computer includes, for example, a laptop, desktop, laptop, etc. equipped with a web browser, and the portable terminal is, for example, a wireless communication device that ensures portability and mobility. , IMT (International Mobile Telecommunication)-2000, CDMA (Code Division Multiple Access)-2000, W-CDMA (W-Code Division Multiple Access), Wibro (Wireless Broadband Internet), LTE (Long Term Evolution) communication-based terminal, smart All types of handheld-based wireless communication devices such as phones and tablet PCs may be included. In addition, “network” means a wired network such as a Local Area Network (LAN), a Wide Area Network (WAN) or a Value Added Network (VAN), a mobile radio communication network, or a satellite It can be implemented in all kinds of wireless networks such as communication networks.

A “3D scanner” according to the present invention refers to a device that converts a three-dimensional model into image data.

"3D printer" according to the present invention refers to a device that outputs image data as a 3D model.

The "metal frame" according to the present invention refers to a structure for dentures made of a metal material and coupled to the upper or lower jaw of the oral cavity.

According to the present invention, "user terminal" refers to a device for processing data in order for a user to produce a metal frame for dentures, and may correspond to various types of devices such as desktops, laptops, servers, smartphones, and tablets.

1 is a view conceptually showing a system for manufacturing a metal frame for dentures according to an example of the present invention.

As shown in FIG. 1 , the system for manufacturing a metal frame for dentures includes a 3D scanner 100 , a 3D printer 200 , casting equipment 300 and a user terminal 400 .

The 3D scanner 100 according to an example of the present invention scans a patient's mouth impression model to generate 3D data. As shown in FIG. 2, a metal frame 220 is used to manufacture a metal frame 220 suitable for a patient through an oral impression model of a patient, that is, a plaster model 210 imitating the patient's gums and teeth in a dental hospital, etc. Create 3D data for

In the process of making a molded gypsum model, an impression is taken using a personal tray at the dentist, and the impression taken goes through a molding process, followed by vacuum mixing of anhydrite on the personal tray and injection without air bubbles using a vibrator.

The 3D printer 200 according to an example of the present invention outputs input 3D data as a 3D resin frame. In this process, a design and modeling process in the user terminal 400 may be required.

The 3D printer 200 according to an example of the present invention does not directly produce 3D data as a metal frame 220, but outputs a 3D resin frame through the 3D printer 200 and uses the output 3D resin frame model to manufacture the metal frame 220.

However, in the case of a 3D printer capable of producing a metal model directly, the process of manufacturing a 3D resin frame may be omitted and 3D data may be directly produced as a metal frame 220 (eg, an output denture).

The casting equipment 300 according to an example of the present invention manufactures the metal frame 220 from a 3D resin frame model through an burial operation and a casting process. In order to manufacture a metal frame based on a 3D resin frame, a process of designing with a CAD program and outputting with a 3D print may be required.

The user terminal 400 according to an example of the present invention controls data processed by the 3D scanner 100 and the 3D printer 200 and processes data related to metal frame production.

The user terminal 400 according to an example of the present invention may perform a process of designing a 3D resin frame for a metal frame for dentures based on the scanned 3D data.

3 is a view showing a process for manufacturing a metal frame for dentures according to an example of the present invention.

The 3D scanner generates 3D data by scanning the oral impression model of the patient with the 3D scanner (S310).

Since the 3D scanner can generate a patient's mouth impression model as 3D data in only about 20 minutes, it has an advantageous effect of increasing the accuracy by digitizing the manually performed part.

The user terminal designs a 3D frame using the generated 3D data and generates 3D resin frame data to be output (S320). When a new 3D resin frame is created, parameters such as shape and dimensions of the 3D resin frame may be designed through a database (DB) of 3D resin frames accumulated and stored in the user terminal.

When creating a new 3D resin frame, since there are non-objective aspects such as the user's technical skill, by accumulating learning each time a 3D resin frame is created, the production environment can be created so that the influence of the user's technical skill is small. has a beneficial effect.

The 3D printer outputs the designed 3D frame as a 3D resin frame (S330). At this time, outputting a three-dimensional model with a resin material is an example for convenience of explanation as a representative material since the 3D resin frame is popular, and the 3D printer output of the present invention is not necessarily limited to the resin material. . Therefore, it is desirable to broadly understand that it is possible to use other materials capable of outputting a three-dimensional model from a 3D printer in addition to resin.

As in the above description, when digital devices such as 3D scanners and 3D printers are used for the process of manufacturing metal frames for dentures (from surveys to wax sculptures), as shown in Table 1 below, considerable time is required. While shortening (from 360 minutes to 195 minutes), the quality can be standardized as a constant process.

handwork Average time (minutes) Digital work (expected) Average time (minutes) survey 30 scanning 20 Metal structure design 10 design 25 block out 20 3d print output 150 Main model cloning 120 Fire Resistant Modeling 60 Fire-resistant model surface hardening 90 wax piece 30 Total Time 360 Total Time 195

The user installs a sprue pin (injection line) on the 3D resin frame output from the 3D printer (S340). The sprue wire is a structure required when manufacturing a cast body using an investment material, and is provided as a passage for injecting molten metal from the outside of the cast body into the inside.

After manufacturing the cast body, if the resin frame inside the cast body is burned out and removed, the metal frame can be manufactured by injecting molten metal into the inner space, such as the wax frame shape (S350).

4 is a diagram illustrating 3D scanning according to an embodiment of the present invention.

As shown in FIG. 4 , 3D data may be generated by scanning a patient's mouth impression model (eg, a plaster model model) using a 3D scanner. Since the oral impression models are different for each patient, the modeled plaster model can be matched with unique identification information to generate 3D data, and it can be grouped into similar model groups to form a database (DB).

5 is a diagram showing a 3D scanning image according to an embodiment of the present invention.

As shown in FIG. 5 , the 3D scanned image may be displayed on a user terminal, and the user terminal may obtain 3D data scanned by the 3D scanner, process the obtained 3D data, and output the 3D printer. can be converted into a form

6 is a diagram showing a design for 3D printing according to an embodiment of the present invention.

As shown in FIG. 6 , the user can design and model the image of the metal frame to be output by executing a program for 3D output in the user terminal. Since the accuracy of the result may vary depending on the user's technical skills in this design and modeling process, the user terminal learns accumulated design and modeling work data and provides a form that can be referred to for similar design and modeling (e.g., modeling image It can be provided to the user as a translucent display) as a layer and a separate layer.

7 is a view of outputting a resin frame from a 3D printer according to an embodiment of the present invention.

As shown in FIG. 7 , the designed and modeled 3D frame is output as a 3D resin frame through a 3D printer. The printed 3D resin frame can be cured with an LCD. In the present invention, a 3D resin printer has been described as an example, but it is also possible to use a 3D printer of a different material depending on the material of 3D printing (eg, FDM printer), and it is also possible to cure in a different way.

Economically, according to the present invention, there is an advantageous effect of lowering the burden on the equipment by adjusting the setting value of a general LCD DLP type 3D printer of one million won instead of a dental 3D printer of about ten million won.

8 is a view showing a process of manufacturing a metal frame according to an embodiment of the present invention.

8 shows a casting process for manufacturing a metal frame from a 3D resin frame according to an embodiment of the present invention, and a sprue pin (injection line) is installed on the output 3D resin frame to It is provided as a passage for injecting molten metal into the inside.

The wax removal casting method will be described as a manufacturing method of the metal frame described in the present invention. First, a cast body is formed while enclosing the entire wax block with an investment.

In order to make a block out model into a fire-resistant model, it is replicated using agar. Thereafter, the hardened refractory model is separated from the agar impression body, and the surface strength of the investment material model is increased through a dipping process of a hardener.

Manufacture of such a fireproof model is to withstand a high-temperature furnace situation of up to 800 degrees Celsius.

Casting is performed by melting cobalt-chromium (CoCr) metal using an oxygen-propane furnace and casting it into an investment material located in a centrifugal casting machine. More specifically, it is possible to bury the wax mold and the fireproof model to which the injection wire is attached, and call the mooring time to recall the hardened investment material at the recall temperature according to the manufacturer's manual, and cast according to the casting temperature.

9 is a view showing a metal frame manufactured according to an embodiment of the present invention.

As shown in FIG. 9, when the metal frame is cast, the oxide film and the investment material remaining on the cast metal frame are removed by applying sand. Then, the sprue wire of the metal frame is cut and polished using various abrasive tools. The suitability can be increased through the process of adjusting the polished metal frame so that it is seated on the cast plaster model without shaking or deformation.

According to the present invention, while the fit of the upper, lower and edentulous cast metal frame is measured in the error range and manual work, it has an advantageous effect of reducing the working time. Since the experiments to shorten the time have been previously described in Table 1, a detailed description thereof will be omitted.

It has been experimentally proven that there is a difference within the margin of error between the results produced by hand and the results printed using digital devices (3D scanners and 3D printers).

Table 2 below measures the fit of the maxillary cast, Table 3 below measures the fit of the mandibular cast, and Table 4 below measures the fit of the edentulous cast. For the measurement method of the suitable bath, the thickness was measured using silicon at 5 places of the manually cast body and the output of the digital device.

model name classification Actual value (unit: mm) A B C D E average difference award
evil
main
article
sifter number
work
up
main
article
sifter Prize 1 0.46 0.54 0.54 0.56 0.61 0.58
0.58-0.58=0 Phase 2 0.50 0.49 0.52 0.40 0.53 Top 3 0.51 0.43 0.49 0.91 0.52 Top 4 0.57 0.67 0.68 0.61 0.62 Top 5 0.56 0.55 0.63 0.59 0.65 Top 6 0.44 0.42 0.37 0.44 0.41 Top 7 0.45 1.24 0.69 0.63 0.77 Top 8 0.63 0.76 0.72 0.72 0.69 Top 9 0.43 0.39 0.38 0.22 0.37 Top 10 0.58 0.97 0.68 0.73 0.74 d
ji
hair
main
article
sifter Prize 1 0.86 0.69 0.71 0.60 0.84 0.58 Phase 2 0.96 0.65 0.56 0.32 0.35 Top 3 0.53 0.51 0.51 0.52 0.45 Top 4 0.84 0.68 0.84 0.43 0.24 Top 5 0.41 0.46 0.48 0.36 0.38 Top 6 0.54 1.29 0.97 0.58 0.92 Top 7 0.87 0.73 0.80 0.91 0.51 Top 8 0.67 0.71 0.73 0.76 0.46 Top 9 0.36 0.18 0.39 0.61 0.29 Top 10 0.38 0.37 0.29 0.21 0.36

model name classification Actual value (unit: mm) A B C D E average difference under
evil
main
article
sifter number
work
up
main
article
sifter bottom 1 0.49 0.87 0.42 0.90 0.66 0.93 0.93-0.90=0.03 ha 2 0.63 0.62 0.87 0.81 0.87 bottom 3 1.81 1.00 0.74 0.60 1.28 bottom 4 0.35 1.54 0.51 0.52 1.46 ha 5 0.46 0.72 1.30 0.50 1.86 ha 6 1.38 0.15 1.34 0.87 1.31 bottom 7 0.84 0.92 1.95 1.57 2.41 ha 8 1.20 0.83 0.64 0.89 0.47 ha 9 0.88 0.48 0.46 1.00 0.77 Ha 10 1.19 0.62 0.63 0.56 1.48 d
ji
hair
main
article
sifter bottom 1 1.23 0.52 0.67 1.28 1.27 0.90 ha 2 1.17 0.94 0.84 1.48 1.23 bottom 3 0.94 0.48 0.34 0.59 0.73 bottom 4 1.01 0.29 0.27 0.29 0.79 ha 5 0.87 1.20 0.92 0.34 0.78 ha 6 1.50 0.49 1.62 1.83 1.78 bottom 7 1.47 0.88 1.41 1.09 0.44 ha 8 1.10 0.62 0.50 1.12 0.97 ha 9 0.65 0.67 0.24 1.23 0.90 Ha 10 0.98 0.48 0.35 0.93 1.06

model name classification Actual value (unit: mm) A B C D E average difference radish
tooth
evil
main
article
sifter number
work
up
main
article
sifter managing director 1 1.20 0.68 0.49 1.29 0.45 0.68 0.68-0.60=0.08 Managing Director 2 0.42 0.80 0.77 0.78 1.00 Managing Director 3 0.37 0.48 0.41 0.40 0.53 Managing Director 4 0.71 0.65 0.65 0.68 0.64 Sangmu 5 0.37 0.40 0.41 0.47 0.42 Hamu 1 0.60 0.65 0.55 0.53 0.68 Hamu 2 0.31 0.34 0.24 0.53 1.10 Hamu 3 0.55 1.45 0.99 0.53 0.95 Hamu 4 1.25 0.52 0.66 0.73 1.11 Hamu 5 1.22 0.81 0.70 0.89 0.75 d
ji
hair
main
article
sifter managing director 1 0.36 0.39 0.58 0.48 0.62 0.60 Managing Director 2 0.68 0.37 0.49 0.62 0.59 Managing Director 3 0.51 1.06 0.76 0.45 0.86 Managing Director 4 0.17 0.55 0.47 0.56 0.30 Sangmu 5 0.30 0.46 0.41 0.22 0.70 Hamu 1 0.51 0.528 0.52 0.68 0.06 Hamu 2 0.35 0.27 0.43 0.42 0.69 Hamu 3 0.53 0.97 0.51 1.29 0.60 Hamu 4 1.30 0.72 1.05 0.77 1.02 Hamu 5 1.25 1.14 0.21 0.60 0.64

An embodiment of the present invention may be implemented in the form of a recording medium including instructions executable by a computer, such as program modules executed by a computer. Computer readable media can be any available media that can be accessed by a computer and includes both volatile and nonvolatile media, removable and non-removable media. Also, computer readable media may include both computer storage media and communication media. Computer storage media includes both volatile and nonvolatile, removable and non-removable media implemented in any method or technology for storage of information such as computer readable instructions, data structures, program modules or other data. Communication media typically includes computer readable instructions, data structures, program modules, or other data in a modulated data signal such as a carrier wave, or other transport mechanism, and includes any information delivery media.

Although the methods and systems of the present invention have been described with reference to specific embodiments, some or all of their components or operations may be implemented using a computer system having a general-purpose hardware architecture.

The above description of the present invention is for illustrative purposes, and those skilled in the art can understand that it can be easily modified into other specific forms without changing the technical spirit or essential features of the present invention. will be. Therefore, the embodiments described above should be understood as illustrative in all respects and not limiting. For example, each component described as a single type may be implemented in a distributed manner, and similarly, components described as distributed may be implemented in a combined form.

The scope of the present invention is indicated by the following claims rather than the detailed description above, and all changes or modifications derived from the meaning and scope of the claims and equivalent concepts should be construed as being included in the scope of the present invention. do.

100: 3D scanner
200: 3D printer
300: casting equipment
400: user terminal

Claims (5)

As a method for manufacturing a metal frame for dentures,
generating 3D data by scanning the patient's mouth impression model with a 3D scanner;
Designing a 3D frame using the 3D data;
outputting the designed 3D frame as a 3D resin frame through a 3D printer;
installing a sprue wire on the output 3D resin frame; and
manufacturing a metal frame from the 3D resin frame in which the sprue wire is installed;
Including, a method for manufacturing a metal frame for dentures. According to claim 1,
The step of manufacturing the metal frame,
Manufacturing a cast body by burying the 3D resin frame in which the sprue wire is installed in an investment material; and
heating the cast body to burn out the 3D resin frame and injecting molten metal into the inner space of the cast body;
Including, a method for manufacturing a metal frame for dentures. According to claim 2,
Further comprising the step of polishing the metal frame for dentures formed of the molten metal, the method of manufacturing a metal frame for dentures. According to claim 2,
The molten metal is
A method for manufacturing a metal frame for dentures, characterized in that the cobalt-chromium (CoCr) material. In the metal frame manufacturing system for dentures,
A 3D scanner for generating 3D data by scanning an oral impression model of a patient;
a design unit for designing a 3D frame and generating 3D frame data using the 3D data;
a 3D printer outputting the 3D frame data generated by the design unit as a 3D resin frame; and
a metal frame manufacturing unit for manufacturing a metal frame from the 3D resin frame;
Including, metal frame manufacturing system for dentures.

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