KR20230033176A - Method for manufacturing metal frame for dentures by using digital scan based CAD and 5-axis milling machine - Google Patents

Abstract

The present invention relates to a method for manufacturing a metal frame for dentures. In one embodiment, disclosed is a method for manufacturing a metal frame, which comprises the steps of: (S10) generating 3D data by scanning an oral impression model of a patient with a 3D scanner; (S20) designing a metal frame by using the 3D data; (S30) converting a CAD file of the designed metal frame into a CAM file; (S40) forming a wax frame by processing a wax block with a milling machine inputted with the CAM file; and (S50) manufacturing a metal frame from the wax frame.

Description

Method for manufacturing metal frame for dentures by using digital scan based CAD and 5-axis milling machine}

The present invention relates to a method for manufacturing dentures, and more particularly, to a method for forming a metal frame from a plaster model of a patient's oral cavity.

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 clasp, and 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, curing it, and drying it at high temperature. It requires 7 to 8 hours of work time, so productivity is low and depends on the experience and career of the maker, and the condition of the day. There is a problem in that it is difficult to manufacture an accurate denture customized for a patient, in which the accuracy of the denture varies depending on the patient.

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

The present invention has been made to solve the above problems, and by manufacturing a metal frame using CAD / CAM, the existing dental laboratory process is improved to provide a customized denture that accurately fits the patient's oral structure with high productivity and constant quality. The purpose is to provide a method that can be produced.

According to one embodiment of the present invention, a method for manufacturing a metal frame for dentures includes: generating 3D data by scanning an oral impression model of a patient with a 3D scanner (S10); Designing a metal frame using the 3D data (S20); Converting the CAD file of the designed metal frame into a CAM file (S30); Forming a wax frame by processing a wax block with a milling machine inputted with the CAM file (S40); and manufacturing a metal frame from the wax frame (S50).

According to one embodiment of the present invention, it is possible to increase the precision and productivity of manufacturing dentures by reducing the manufacturing time of the metal frame. For example, according to the present invention, 3D data is created by scanning an oral impression model (time required 10 minutes), a metal frame is designed (time required 25 minutes), the designed CAD file is converted into a CAM file (time required 10 minutes) After that, it only takes about 3 hours to obtain a wax frame in the shape of a metal frame using a milling device (required time: 180 minutes). , Therefore, productivity can be increased compared to the conventional manual method.

In addition, according to the present invention, since the metal frame is processed using CAD / CAM, it is possible to manufacture a customized denture that more precisely and accurately fits the oral cavity of the patient by improving the existing dental laboratory process.

1 is a flow chart showing a method for manufacturing a metal frame according to an embodiment of the present invention;
Figure 2 is a view showing the steps of designing a metal frame using CAD software;
3 is a view showing how a wax frame is formed by processing a wax block with a 5-axis milling machine according to one embodiment;
4 is a view showing an exemplary configuration of a wax frame processed by a 5-axis milling machine;
Fig. 5 is a diagram showing an exemplary configuration of a metal frame fabricated from a wax frame by a dewax casting method.

The above objects, other objects, features and advantages of the present invention will be easily understood through the following preferred embodiments in conjunction with the accompanying drawings. However, the present invention is not limited to the embodiments described herein and may be embodied in other forms. Rather, the embodiments introduced herein are provided so that the disclosed content will be thorough and complete and the spirit of the present invention will be sufficiently conveyed to those skilled in the art.

In this specification, when terms such as first and second are used to describe components, these components should not be limited by these terms. These terms are only used to distinguish one component from another. Embodiments described and illustrated herein also include complementary embodiments thereof.

In this specification, singular forms also include plural forms unless specifically stated otherwise in a phrase. The expressions 'comprises', 'consists of', and 'consists of' used in the specification do not exclude the presence or addition of one or more other elements in addition to the mentioned elements.

In this specification, the term 'software' refers to technology that moves hardware in a computer, and the term 'hardware' refers to a type of device or device (CPU, memory, input device, output device, peripheral device, etc.) constituting a computer, , the term 'step' means a series of processes or operations connected in time series to achieve a predetermined goal, and the term 'computer program', 'program', or 'algorithm' refers to a set of instructions combined for computer processing and the term 'program recording medium' refers to a computer-readable recording medium on which a program used to install, execute, or distribute a program is recorded.

The present invention will be described in detail with reference to the following drawings. In describing the specific embodiments below, various specific details have been prepared to more specifically describe the invention and aid understanding. However, readers who have knowledge in this field to the extent that they can understand the present invention can recognize that it can be used without these various specific details. In addition, in describing the invention, it is mentioned in advance that parts that are well-known or commonly used technologies but are not significantly related to the invention are not described in order to prevent confusion in describing the present invention.

1 is a flowchart illustrating a method of manufacturing a metal frame according to an embodiment of the present invention.

Referring to FIG. 1, a method of manufacturing a metal frame according to an embodiment includes generating 3D data by scanning an oral impression model of a patient with a 3D scanner (S10), and designing a metal frame using the 3D data (S10). S20), converting the CAD file of the designed metal frame into a CAM file (S30), forming a wax frame by processing the wax block with a milling machine inputting the CAM file (S40), and the wax frame It may include a step (S50) of manufacturing a metal frame from.

As a more specific embodiment, first, in step S10, three-dimensional (3D) data about teeth and/or gums inside the oral cavity of the patient is generated. In one embodiment, if there is an impression model of the oral cavity of the patient, 3D data may be generated by scanning the impression model with a 3D scanner. At this time, the oral impression model of the patient is, for example, indicated by the member number 40 in FIG. 5, and may be a plaster model modeled after the gums and teeth of the patient's mouth, or alternatively, it may be an impression model made of a material other than plaster. .

In one embodiment, this impression model is scanned with a 3D scanner to generate 3D data of the patient's oral cavity. 3D data is data about the shape of the inside of the patient's oral cavity and can be created in the form of, for example, an STL file. However, the file format of the 3D data is not limited and may be data in an arbitrary file format.

After that, in step S20, a metal frame suitable for the patient is designed using CAD software. In this regard, FIG. 2 captures a part of the computer screen 10 on which the CAD software is executed. Referring to FIG. 2, the 3D data of the oral impression model generated in step S10 on the computer screen 10 ( 11) is displayed, and in this state, the operator designs the shape of the metal frame 12 suitable for the oral structure of the patient.

In one embodiment, when designing the metal frame 12, the metal frame may be designed with reference to metal frame data previously stored in a database (not shown). For example, a worker accumulates 3D data of a metal frame produced by hand and/or computer work in advance in a database, and data accumulated in the database when designing a new metal frame 12 in step S20 Parameters such as the shape and dimensions of the metal frame 12 may be designed with reference to.

Next, in step S30, the CAD file of the metal frame 12 designed in step S20 is converted into a CAM (computer aided manufacturing) file. For example, if a predetermined 5-axis milling machine for manufacturing the shape of the metal frame 12 is determined, the CAD file may be converted into a CAM file format applicable to the milling machine.

When the CAM file for the metal frame 12 is created, the wax block is processed with a milling machine to form a wax frame (S40). For example, FIG. 3 shows a process of forming a wax frame 35 by processing a wax block 30 with a 5-axis milling machine 20 according to one embodiment, and FIG. 4 shows a process of forming a wax frame 35 by a milling machine 20. The wax frame 35 is formed on the block 30.

Here, the wax block 30 is, for example, a disc-shaped wax material having a predetermined thickness. However, the shape of the wax block 30 is not limited to a disk shape, and may be a block of other shapes, such as a hexagonal block.

In the illustrated embodiment, the wax frame 35 is formed by fixing the wax block 30 to the 5-axis milling machine 20 and processing the wax block 30 using an end mill. Since the wax block 30 was processed by inputting the CAM file of the metal frame 12 obtained in step S30 to the milling machine 20, the wax frame 35 formed by processing in this way has the same shape as the metal frame 12 will understand that you will have

After that, in step S50, a metal frame (50 in FIG. 5) is manufactured using the wax frame 35. In one embodiment, the metal frame 50 may be manufactured using a wax removal casting method. However, in an alternative embodiment, the metal frame 50 may be fabricated by a method other than dewax casting. Fig. 5 shows a metal frame 50 fabricated by the dewax casting method (or other method).

As an exemplary method of the wax removal casting method for manufacturing the metal frame 50, first, the entire wax frame 35 is surrounded by an investment material to form a cast body. At this time, the investment material may be composed of, for example, a heat-resistant refractory material and a binder. When manufacturing a cast body using an investment material, a sprue pin is formed. The injection line pin provides a passage for injecting molten metal from the outside of the cast body into the inside.

When the cast body is fabricated, the cast body is then heated, thereby melting the wax frame 35 inside the cast body. When the molten wax frame 35 is removed, an internal space having the same shape as the wax frame 35 is formed inside the cast body, and molten metal is injected into this internal space. For example, molten metal may be injected through the injection line pin. The metal used at this time may be a metal or alloy generally used for dental purposes, such as titanium, titanium alloy, cobalt-chromium alloy, and nickel-chromium alloy.

After the above casting process is completed, the metal frame 50 formed of the metal or alloy can be obtained by cooling the casting body and removing the investment material, and the metal frame 50 obtained in this way is, for example, removing surface oxide, cutting the injection line, The final metal frame 50 may be obtained by performing an additional operation such as polishing. In addition, when artificial teeth are coupled to the metal frame 50 manufactured through steps S10 to S50 of FIG. 1 as described above, dentures can be finally manufactured.

As described above, the present invention can manufacture a patient-customized denture more productively and accurately by improving the existing dental laboratory process using CAD / CAM, and those of ordinary skill in the field to which the present invention belongs as described above It can be understood that various modifications and variations are possible from the description of. Therefore, the scope of the present invention should not be limited to the described embodiments and should not be defined, but should be defined by not only the claims to be described later, but also those equivalent to these claims.

10: CAD program screen
20: 5-axis milling machine
30: wax block
35: wax frame
40: oral impression model
50: metal frame

Claims (2)

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 (S10);
Designing a metal frame using the 3D data (S20);
Converting the CAD file of the designed metal frame into a CAM file (S30);
Forming a wax frame by processing a wax block with a milling machine inputted with the CAM file (S40); and
Manufacturing a metal frame from the wax frame (S50); a metal frame manufacturing method comprising the. The method of claim 1, wherein the step (S50) of manufacturing a metal frame from the wax frame,
manufacturing a cast body by burying the wax frame with an investment material;
melting the wax frame by heating the cast body;
injecting molten metal into the inner space of the cast body defined by the molten wax frame; and
A method of manufacturing a metal frame comprising: cooling the cast body and removing the investment material to obtain a metal frame formed of the metal.

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