KR102212408B1 - overdenture structure and its constructing method - Google Patents

Abstract

A method of constructing an overdenture structure is disclosed. The method of constructing an overdenture structure includes the steps of: acquiring CT data; taking first digital impression; planning a fixture placement location plan; designing a surgical guide; producing a surgical guide; placing fixtures in the patient′s alveolar bone; taking second digital impression; designing an overdenture bar model; manufacturing the overdenture bar model with a 3D printer; modifying the shape of the overdenture bar model; scanning the overdenture bar model; designing an overdenture bar; manufacturing the overdenture bar by machining; assembling the overdenture bar to fixtures in the patient′s mouth; and assembling an overdenture to the overdenture bar.

Description

Overdenture structure and its constructing method {overdenture structure and its constructing method}

The present invention relates to an overdenture structure, and more particularly, to a method of manufacturing an overdenture bar using a CAD cam and constructing an overdenture structure using the same.

As one of the dental restoration treatment methods for recovering the function and condition of the tooth structure lost due to tooth decay or external shock, an implant procedure is well known. In general, implants are a fixture that acts as an artificial root corresponding to the root of a natural tooth, a tooth head, that is, a crown that is a prosthesis that acts as a crown, and an abutment that connects the fixture and the crown. Includes (abutment). Ordinary prostheses and dentures (i.e., dentures) damage the teeth and bones over time, but implants do not damage the tissues around the teeth. have. However, such an implant procedure requires as much as the number of missing teeth, so if many teeth are lost, replacing all of them with implants takes considerable cost and time, and if the amount of remaining gum bones is insufficient. There is a drawback that it is difficult to perform the procedure.

In order to solve the shortcomings of the above implant procedure, an implant-supported overdenture procedure has been recently proposed. In this method, after placing a plurality of fixtures in the upper or lower jaw, the overdenture is detachably fixed using a holding device fixed to the fixture. There are various retaining devices, and the overdenture bar has the advantage of providing evenly distributed force to the fixtures. Typically, overdenture bars are designed and manufactured by hand through very long and complex processes while being labor intensive. In recent years, the technology of manufacturing overdenture bars customized for patients is developing. The recent overdenture bar is partially designed and manufactured with CAD/CAM system applied. In this system, an impression of the mouth of the patient in which the fixture is placed is taken. The dental laboratory builds a model of the patient's mouth from the impression and fabricates the devices to record the maxillo-mandibular relationship. Thereafter, the dental laboratory manufactures a wax setup, and then, the model and the wax tooth arrangement are scanned by a scanner. In addition, the CADCAM system designs and manufactures implant bars using the scanned data.

However, the overdenture bar manufactured in the same manner as above may have serious errors, and the delivery period was also long, so the treatment period was inevitably long. In addition, the conventional method uses a rubber impression-taking method to draw a tooth bone, which has problems of inconvenient, inaccuracy, and deformation error of the diagnostic model.

US2014/0106023 (released April 17, 2017)

The problem to be solved by the present invention is to use CAD cam, but before finally manufacturing an overdenture bar and applying it to the oral cavity together with the overdenture, an overdenture model is produced in advance so that the produced overdenture model can be checked. As a result, it is to provide a more reliable and safe overdenture structure and a method for constructing an overdenture structure, and an overdenture structure mule implemented by the method.

In an overdenture structure construction method according to an aspect of the present invention, a state including a detailed state of a tooth and jawbone in an oral cavity where a tooth is defective, and a position of a nerve is performed using a cone beam computed tomography unit (10). Step of obtaining CT data by photographing (S101); A first digital impression taking step (S102) of obtaining first scan data of the patient's oral cavity by 3D scanning the inside of the patient's oral cavity with a missing tooth with the oral scanner 20; In the CAD cam system 30, the step of matching the first scan data and the CT data, and planning a fixture placement plan in consideration of the relationship with the opposing teeth, occlusion, and bone tissue (S103); In the CAD cam system 30, designing a surgical guide based on the placement plan (S104); Manufacturing a surgical guide using a 3D printer 40 according to the design of the surgical guide (S104) (S105); In accordance with the fixture placement plan, using the surgical guide, placing the fixtures (2) in the alveolar bone of the patient (S106); A second digital impression taking step (S201) of obtaining second scan data by 3D scanning the inside of the patient's mouth with the oral scanner 20 in the state in which the fixtures 2 are placed; Designing an overdenture bar model 200 by using the second scan data in the CAD cam system 30 (S202); According to the design of the overdenture bar model 200, manufacturing the overdenture bar model 200 with a 3D printer 40 (S203); Modifying the shape of the overdenture bar model 200 manufactured by the 3D printer 40 (S204); Scanning the overdenture bar model 200 with the modified shape using a 3D scanner (S301); Designing the overdenture bar 100 by using the scan data obtained by scanning the overdenture bar model 200 in the CAD cam system 30 (S302); Manufacturing the overdenture bar 100 by machining according to the design of the overdenture bar 100 (S303); Assembling the overdenture bar 100 manufactured by the machining to fixtures in the patient's mouth (S304); And assembling the overdenture 400 to the overdenture bar 100 (S306).

According to an embodiment, the step (S202) allows the passage of the screws and includes the shape of the posts 210 in which the connection holes 212 corresponding to the fixtures are formed, the neck cross section, and the circular arc cross section. It is a step of designing an overdenture bar model 200 including both the cross-sectional shape of the header bar and the outer shape of the clip integrally integrated in the middle of the header bar and the shape of the block portion on both sides, and the step (S302) is The sub shape is separated into an arm part 152 and a male part 154 fitted to the arm part 154, and the clip shape 140 is separated from the cross-sectional shape of the header bar, so that the shape of the male part 154 with the arm part removed This is a step of designing the overdenture bar 100 including the shape of the header bar 130 consisting of only the cross section of the neck 131 and the cross section of the head 132 by removing the clip shape 140.

The present invention uses CAD cam, but before finally manufacturing an overdenture bar and applying it to the oral cavity together with the overdenture, by making an overdenture model in advance and allowing the produced overdenture model to be checked, it is more reliable and It has the advantage of being able to safely build an overdenture structure.

In the present invention, the overdenture bar model is produced with a 3D printer before the overdenture bar is manufactured, and the overdenture bar model is elastic to the cross-section of the header bar while being provided in the overdenture as well as the cross-sectional shape and shape of the head After being manufactured to include both the shape of the clip that is interlocked with each other and the shape of the arm where the male part is inserted, the overdenture bar designed from the scan of the overdenture bar model and the data obtained through the scan is separated from the shape of the clip. Including the cross-sectional shape and the shape of the male portion separated from the arm portion, an error that may exist between the clip and the header bar and the error that may exist between the male portion and the arm portion can be eliminated.

1 is a block diagram showing an overdenture bar manufacturing system according to the present invention.
2 is a flowchart illustrating a first process of a method for constructing an overdenture bar according to an embodiment of the present invention.
3 is a flowchart illustrating a second process of a method for constructing an overdenture bar according to an embodiment of the present invention.
4 is a diagram for explaining an overdenture bar model manufactured by the second process of FIG. 3.
5 is a diagram schematically showing an overdenture.
6 is a flowchart illustrating a third process of a method for constructing an overdenture bar according to an embodiment of the present invention.
7 is a view for explaining an overdenture bar manufactured by the third process of FIG. 6.
FIG. 8 is a view for explaining a viscoelastic magnet that allows the clip and the header bar to be engaged and allows the hand part of the overdenture bar to be always attached to the groove of the arm provided in the overdenture.

Hereinafter, exemplary embodiments of the present invention will be described with reference to the accompanying drawings. Prior to describing specific details for the implementation of the present invention, terms or words used in the present specification and claims indicate that the inventor can appropriately define the concept of terms in order to describe his invention in the best way. Based on the principle, it should be interpreted as a meaning and concept consistent with the technical idea of the present invention. In addition, when it is determined that a detailed description of known functions and configurations related to the present invention may unnecessarily obscure the subject matter of the present invention, it should be noted that the detailed description has been omitted. Hereinafter, exemplary embodiments of the present invention will be described with reference to the accompanying drawings.

1 is a block diagram showing a system for manufacturing an overdenture bar according to the present invention, FIG. 2 is a flow chart for explaining a first process of a method for building an overdenture bar according to an embodiment of the present invention, and FIG. A flow chart for explaining the second process of the method for constructing an overdenture bar according to an embodiment of the present invention, and FIG. 4 is a view for explaining an overdenture bar model manufactured by the second process of FIG. 3, and FIG. 5 Is a diagram schematically showing an overdenture, FIG. 6 is a flow chart for explaining a third process of the method for constructing an overdenture bar according to an embodiment of the present invention, and FIG. 7 is a diagram manufactured by the third process of FIG. It is a view for explaining the overdenture bar, and FIG. 8 is a view for explaining a viscoelastic magnet that allows the clip and the header bar to be engaged and allows the hand part of the overdenture bar to be always attached to the groove of the arm provided in the overdenture. .

Referring to FIG. 1, the overdenture bar manufacturing system includes a cone beam computed tomography unit 10 that acquires CT data by photographing detailed states of teeth and jawbones and positions of nerves, and a tooth structure in the oral cavity of a patient. An intraoral digital tooth model, i.e., 3D, based on the oral scanner 20 for obtaining scan data and the CT data acquired by the cone beam computed tomography unit 10 and the scan data acquired by the oral scanner 20 Create a data model, design a surgical guide, an overdenture bar model, and an overdenture bar, but generate 3D printing data and/or milling data of the surgical guide, the overdenture bar model, and the overdenture bar. A 3D printer 40 for manufacturing a model of the surgical guide and the overdenture bar by 3D printing based on the 3D printing data of the CAD cam system 30 and the CAD cam system 30, and the CAD cam system 30 ) On the basis of the milling data, and a cam machine tool for manufacturing the overdenture bar by milling.

In addition, the overdenture bar manufacturing system further includes a server device 60 capable of storing data received from the oral scanner 20 and the cone beam computed tomography unit 10 and transmitting the stored data to the outside. Can include.

The CAD cam system 30 may include a design program, a virtual 3D printing program that implements 3D printing simulation means, and a virtual 3D milling program that implements 3D milling simulation means. Further, the CAD cam system 30 includes a computer aided design (CAD) system and a computer aided manufacturing (CAM) system that are integrated with each other. The CAD system 30 is used to design a surgical guide, an overdenture bar model and an overdenture bar to be described below, and the CAM system is a surgical guide, an overdenture bar model, and a virtual milling program and/or a virtual 3D printing program. 3D printing production data or milling processing data of the overdenture bar may be generated and transmitted to the 3D printer 40 or the cam machine tool 50.

The construction method of the overdenture structure of the present embodiment includes a first process of placing a plurality of fixtures in the upper or lower jaw of a patient, and the shape and neck cross section of the posts that allow the passage of screws and have connection holes corresponding to the fixtures. After producing an overdenture bar model including both the shape of the header bar including the cross section of the arc portion, the external shape of the clip integrally integrated in the middle of the header bar, and the shape of the cylindrical block portion on both sides, According to the result of the second process and the second process of verifying, supplementing and correcting the overdenture bar model, the shape of the block is divided into an arm part and a male part fitted to the arm part, and the clip shape is separated from the header bar shape. And a third process of manufacturing an actual overdenture bar including the shape of the head from which is removed and the shape of the header bar from which the clip is removed.

Referring to FIGS. 1 and 2, the first process is a step of obtaining CBCT data by photographing detailed states of teeth and jawbones in the mouth where teeth are missing, and nerve locations using a cone beam computed tomography unit 10. (S101), a first digital impression taking step (S102) of acquiring first scan data of the patient's oral cavity by 3D scanning the inside of the patient's mouth with missing teeth with the oral scanner 20, and the CAD cam system ( In 30), the step of matching the first scan data and the CBCT data, and planning a fixture placement position plan in consideration of the relationship between the opposing teeth, occlusion, and bone tissue (S103), and in the CADcam system 30 , Based on the placement plan, designing a surgical guide (S104), and producing a surgical guide using a 3D printer according to the design of the surgical guide (S104) ( S105) and, according to the fixture placement plan, using the surgical guide, a step (S106) of placing the fixture in the alveolar bone of the patient.

In the first process, the obtained CBCT data and scan data are stored in an STL file format.

In addition, referring to FIGS. 1 to 5, the second process includes 3D scanning the inside of the patient's oral cavity with the oral scanner 20 in a state in which the fixtures are placed in the tooth defect area to obtain second scan data. A second digital impression taking step (S201) and, in the CAD cam system 30, using the second scan data, a connection hole 212 that allows the passage of screws (not shown) and corresponds to the fixtures The shape of the formed posts 210 and the cross-sectional shape of the header bar 230 including the neck section 231 and the arc section 232 and the clip integrally integrated in the middle of the header bar 230 Designing the overdenture bar model 200 including both the outer shape 240 and the block shape 250 on both sides (S202), and according to the design of the overdenture bar model 200, the overdenture bar model 200 The step of manufacturing the denture bar model 200 with the 3D printer 40 (S203), and the step of mechanically (physical) modifying the shape of the overdenture bar model 200 manufactured by the 3D printer 40 ( S204).

When performing the second digital impression taking step 201, a scan body is fastened to the fixture, which prevents degradation of the obtained scan data due to light reflection of the fixture. In addition, the overdenture bar model 200 can be easily manufactured by the 3D printer 40, and a material that can be easily modified by a practitioner, such as a synthetic resin material, can be advantageously used.

Using the screws passing through the connection holes 212, the overdenture bar model 200 is directly coupled to a fixture (not shown) placed in the patient's mouth, and the overdenture bar model 200 is prefabricated. The overdenture model 200 may be physically corrected after the overdenture model 200 is visually checked by bringing the overdenture 400 close to each other. It may be considered to also produce a screw model corresponding to the actual screw. However, since the screw can be used as a ready-made product without a separate design, separately manufacturing the screw model may be omitted. In addition, it may be considered that the overdenture bar model 200 and the fixture are assembled in a state where they are easily separated or temporarily bonded by an adhesive having poor adhesiveness without screwing. In this case, it is noted that the overdenture bar model 200 may be designed in a state in which a connection hole through which screws pass through may be omitted.

In addition, referring to FIGS. 1 to 7, in the third process, in a state in which the overdenture bar model 200 is assembled to the fixture or separated from the fixture, the overdenture bar model 200 is oral. Scanning using the scanner 20 or a separate 3D scanner (S301), and in the CAD cam system 30, in the scanned overdenture bar model, the shape of the convex portion is transferred to the arm 152 and the arm 154. The shape of the clip 140 is separated from the shape of the header bar 130, and the shape of the male part 154 with the arm part removed and the clip 140 are removed, so that the neck section 131 and the head Designing the overdenture bar 100 including the shape of the header bar 130 consisting of only the sub-section 132 (S302) and designing the overdenture bar 100 using the cam machine tool 50 According to the step of manufacturing the overdenture bar 100 by machining (S303) and the step of assembling the overdenture bar 100 manufactured by the cam machine tool 50 to fixtures in the patient's mouth ( S304) and assembling the overdenture 400 to the overdenture bar 100 (S306).

In this way, the overdenture bar 100 made of a titanium alloy using a cam machine tool such as CNC allows the passage of screws (not shown) and a connection hole 112 corresponding to the fixtures (not shown) is provided. It includes a plurality of formed posts 110, a header bar 130 including a neck end section 131 and an arc section 132, and male parts 154 formed to protrude upward from both sides.

In addition, the overdenture 400 corresponding to the overdenture bar 100 includes an arm 452 inserted into the male portion 154 of the overdenture bar 100, and the arm 452 includes the It has a shape corresponding to the shape of the arm part separated from the shape of the male part in the cylindrical block shape. In addition, the overdenture 400 includes a clip 440 engaged with the cross section of the header bar 130 of the overdenture bar 100, the clip 440 is a clip shape separated from the header bar shape in step S202 It has a shape corresponding to. The shape of the arm 452 and the shape of the clip 440 may be shapes previously stored in the CAD cam system. Alternatively, the arm portion and the clip may be manufactured based on the separated shape in step S202. At this time, the overdenture bar 100 is preferably formed of a titanium alloy material.

Referring to FIG. 8, in a state in which the clip 440 provided in the overdenture is completely engaged with the header bar 130 of the overdenture bar 100, the groove base surface 4241 and the male part 154 of the arm 452 It is preferable that a gap exists between the ends of, and a viscoelastic magnet 12 is preferably disposed in the gap. The viscoelastic magnet 12 is bonded to the groove base surface 4241 of the arm 452 by an adhesive applied in the groove of the arm 452. If the magnet adhered to the groove base surface 4251 does not have viscoelasticity, when there is a slight error in the protruding length of the hand part 154, the clip 440 is attached to the header bar 130 of the overdenture bar 100. It will not be completely engaged, and if there is an error in which the length of the hand part 154 is only slightly short, the clip 440 will not be able to contact the magnet in a state where the clip 440 is completely bitten by the header bar 130. However, when the viscoelastic magnet 12 is employed, the clip 440 allows the header bar 130 to be engaged while being compressed and deformed by being pressed against the end of the male part 154 of the viscoelastic magnet 12, so the above problem It prevents the fear of occurrence.

10.....................Conbeam Computed Tomography Unit
20.....................Oral scanner
30.....................CAD Cam System
40.....................3D printer
50.....................cam machine tools

Claims (2)

Obtaining CT data by photographing a state including the detailed state of the tooth and jawbone in the oral cavity where the tooth is missing, and the position of the nerve, with a one beam computed tomography unit 10 (S101);
A first digital impression taking step (S102) of obtaining first scan data of the patient's oral cavity by 3D scanning the inside of the patient's oral cavity with a missing tooth with the oral scanner 20;
In the CAD cam system 30, the step of matching the first scan data and the CT data, and planning a fixture placement plan in consideration of the relationship with the opposing teeth, occlusion, and bone tissue (S103);
In the CAD cam system 30, designing a surgical guide based on the placement plan (S104);
Manufacturing a surgical guide using a 3D printer 40 according to the design of the surgical guide (S104) (S105);
In accordance with the fixture placement plan, using the surgical guide, placing the fixtures (2) in the alveolar bone of the patient (S106);
A second digital impression taking step (S201) of obtaining second scan data by 3D scanning the inside of the patient's mouth with the oral scanner 20 in the state in which the fixtures 2 are placed;
Designing an overdenture bar model 200 by using the second scan data in the CAD cam system 30 (S202);
According to the design of the overdenture bar model 200, manufacturing the overdenture bar model 200 with a 3D printer 40 (S203);
Modifying the shape of the overdenture bar model 200 manufactured by the 3D printer 40 (S204);
Scanning the overdenture bar model 200 with the modified shape using a 3D scanner (S301);
Designing the overdenture bar 100 by using the scan data obtained by scanning the overdenture bar model 200 in the CAD cam system 30 (S302);
Manufacturing the overdenture bar 100 by machining according to the design of the overdenture bar 100 (S303);
Assembling the overdenture bar 100 manufactured by the machining to fixtures in the patient's mouth (S304); And
And assembling the overdenture (400) to the overdenture bar (100) (S306). The method of claim 1, wherein the step (S202) allows the passage of the screws and includes the shape of the posts 210 in which the connection holes 212 corresponding to the fixtures are formed, and the neck section and the circular arc section. Designing an overdenture bar model 200 including both the cross-sectional shape and the outer shape of the clip integrally integrated in the middle of the header bar and the shape of the block portion on both sides, and the step (S302) includes the block portion By separating the shape into an arm 152 and a male portion 154 fitted to the arm portion 152, and separating the clip shape 140 from the cross-sectional shape of the header bar, the shape and the clip of the male portion 154 with the arm portion removed A method for constructing an overdenture structure, characterized in that it is a step of designing an overdenture bar 100 including a shape of a header bar 130 consisting of only the neck section 131 and the head section 132 by removing the shape 140 .

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