WO2023063504A1

WO2023063504A1 - Split prosthesis and method for manufacturing same

Info

Publication number: WO2023063504A1
Application number: PCT/KR2022/002692
Authority: WO
Inventors: 김진철; 김진백
Original assignee: 주식회사 디오
Priority date: 2021-10-15
Filing date: 2022-02-24
Publication date: 2023-04-20
Also published as: KR20230054527A; KR102573106B1

Abstract

In order to improve manufacturing precision and durability, the present invention provides a method for manufacturing a split prosthesis, the method comprising: a first step in which a virtual prosthetic base is set on the basis of a planning image; a second step in which a virtual bridge base is virtually arranged so as to be continuously overlapped along the lower end of the virtual prosthetic base; a third step in which the virtual prosthetic base and the virtual bridge base are virtually split at the same time along a virtual splitting surface; and a fourth step in which each of split prosthetic parts and split metal bridges are manufactured on the basis of a generated virtual image, and the respective split metal bridges are assembled and fixed to the respective split prosthetic parts.

Description

Split-type prosthesis and manufacturing method thereof

The present invention relates to a split-type prosthesis and a method for manufacturing the same, and more particularly, to a split-type prosthetic with improved manufacturing precision and durability and a method for manufacturing the same.

In general, a prosthesis is an artificial periodontal tissue in the oral cavity that artificially restores an appearance and function by replacing a missing natural tooth. The prosthesis may be installed inside the oral cavity through an implant placed in the alveolar bone.

The prosthesis is assembled after the artificial tooth part and the coupling part are manufactured separately. In detail, the artificial tooth part is made of an oligomer acrylic material or a zirconia material. And, the coupling portion is formed of a metal material as a portion that is engaged between the abutment fastened to the upper end of the implant and the fastening screw. A coupling groove into which the upper end of the abutment and the fastening screw are inserted is formed in the coupling portion at each location where the implant is placed. An assembly groove into which the coupling part is inserted and fixed is formed on the inner surface of the artificial tooth part.

On the other hand, the placement direction of the implant is formed differently according to each position in consideration of the anatomical structure of the oral cavity and alveolar bone density. That is, the implant is placed inclined in a predetermined direction rather than placed vertically. In addition, the placement direction and angle of the implant is different on the anterior and posterior teeth.

Here, when the coupling part is formed continuously and integrally from the anterior tooth side to the molar side, the central portion and both ends of the coupling portion must be twisted at different angles to correspond to the direction and angle of the implant placement. At this time, the coupling portion is formed of a metal material, but there is a problem in that it is difficult to precisely process the twisted shape of the coupling portion during metal processing such as milling.

In addition, the assembly groove should also be formed in consideration of the shape manufactured by twisting the coupling part. Therefore, the assembly groove is formed with a margin excessively larger than the volume of the actual coupling part. Due to this, the thickness of the artificial tooth portion is relatively thin, and there is a problem in that the support strength of the artificial tooth portion against the mastication pressure is lowered. Moreover, twist angles of the central portion and both ends of the coupling portion are different. Therefore, there is a problem in that interference occurs when assembling the coupling part into the assembly groove.

Thus, a technique for dividing the coupling part into a plurality of at least two or more has been partially disclosed. In detail, the coupling portion is spaced apart along the dental arch and provided with a plurality, and each coupling portion includes at least one coupling groove. In addition, the artificial tooth portion is formed by partitioning an assembly groove into which a plurality of coupling portions are respectively assembled.

Here, each of the coupling parts is formed to extend in the direction of the dental arch on the outside after the position of the coupling groove is determined, and the shape of the coupling part is individually designed and manufactured according to each patient. As a result, the overall design period of the prosthesis increases, and as the design process becomes complicated, there is a problem in that it takes a long time to manufacture the prosthetic.

In addition, an impression model of the oral cavity of the patient is required to determine the accuracy of each coupling part. Due to this, there is a problem in that the overall manufacturing process of the prosthetic increases and the inconvenience increases as the patient repeatedly visits the dentist to manufacture the impression model. Moreover, as each of the coupling parts is spaced apart along the direction of the dental arch, a spaced portion in which the artificial tooth unit cannot be supported through the coupling portion is generated. For this reason, there was a problem that the vicinity of the separation portion is fractured when a strong mastication pressure is applied to the artificial tooth portion.

In order to solve the above problems, an object of the present invention is to provide a split type prosthetic with improved manufacturing precision and durability and a method for manufacturing the same.

In order to solve the above problems, the present invention provides a first step in which a virtual prosthetic base in which a plurality of tooth images are continuously arranged is set based on a planning image generated through a planning unit; a second step of extracting a virtual bridge base from the digital library, loading it into the planning unit, and virtually arranging the virtual prosthetic base so that it continuously overlaps along the lower center and both ends of the virtual prosthetic base; a third step in which a virtual assembly groove is set at a portion where the virtual bridge base overlaps with the virtual prosthesis base, and the virtual prosthetic base and the virtual bridge base are simultaneously virtual divided based on a virtual dividing surface in which a plurality of spaces are set; and the virtually divided virtual prosthetic base and the virtual bridge base are transmitted to a manufacturing device to manufacture a divided prosthetic part and a divided metal bridge, respectively, and each of the divided metal bridges is assembled and fixed to the divided prosthetic part to produce a divided type prosthesis. A manufacturing method of the split prosthesis including the final manufacturing step is provided.

On the other hand, the present invention has an assembly groove corresponding to the outer shape of a virtual bridge base set to correspond to a virtual prosthetic base in which a plurality of tooth images are continuously arranged, so that the virtual coupling part is continuously and integrally connected through the virtual extension part. a divided prosthetic part formed on a lower inner surface and divided based on a virtual dividing surface set between a plurality of virtual teeth selected as at least one of virtual teeth between the tooth images and provided in a plurality; and a plurality of coupling portions coupled to the implant based on the virtual bridge base and a plurality of extension portions integrally connecting the coupling portions, wherein at least one of the plurality of extension portions is the virtual division Provided is a split type prosthesis including split metal bridges divided on the basis of a plane and provided in plurality.

Through the above solution, the present invention provides the following effects.

First, the divided prosthetic part and the divided metal bridge are divided and formed according to the segmented area in which adjacent implantation information having the minimum implantation angle is grouped by comparing the implantation angles calculated for each tooth position. Through this, since the coupling direction between each divided prosthetic part and the divided metal bridge is set constant without distortion in the longitudinal direction, interference during assembly can be minimized.

Second, even if the implantation angle for each tooth position is formed differently along the direction of the dental arch, coupling parts having a minimum angle error between neighbors are grouped and formed separately. Accordingly, even if the number of implants to be placed is increased to 8, assembly is possible without interference, so that the prosthesis can be firmly fixed in the oral cavity by placing a plurality of implants.

Third, both ends of the divided metal bridge are extended in a substantially continuous arrangement structure so as to be adjacent to each other with a minimum gap, and are inserted into assembly grooves continuously opened in the lower part of the divided prosthetic part along the direction of the dental arch. Therefore, since the lower portion is continuously supported even though the prosthesis is formed in parts, durability against mastication pressure can be remarkably improved.

Fourth, a virtual division surface for virtually dividing the integrated design image along the direction of the dental arch is set based on the virtual interdental space between each tooth image. Therefore, even if the split prosthetic part is divided into a plurality of pieces, each artificial tooth substantially maintains continuity and has an appearance similar to that of an integrated complete prosthesis, thereby providing a high-quality prosthesis with improved aesthetics.

1 is a flowchart of a method for manufacturing a split type prosthesis according to an embodiment of the present invention.

2 is a block diagram of a manufacturing system for a segmented prosthesis according to an embodiment of the present invention.

3 is an exemplary view showing a planning image applied to a manufacturing method of a segmented prosthesis according to an embodiment of the present invention;

4 is an exemplary diagram illustrating a process of setting placement information in a manufacturing method of a split prosthesis according to an embodiment of the present invention.

5A and 5B are exemplary diagrams illustrating a process of creating a virtual split prosthesis and a virtual split bridge in the manufacturing method of a split prosthesis according to an embodiment of the present invention.

6A is a projected bottom view of a segmented prosthetic part manufactured according to a manufacturing method of a segmented prosthesis according to an embodiment of the present invention.

6B is a partially cut-away perspective view of a split metal bridge manufactured according to a method for manufacturing a split prosthesis according to an embodiment of the present invention.

7A and 7B are exemplary views illustrating a manufacturing process of a final split-type prosthesis in the method of manufacturing a split-type prosthesis according to an embodiment of the present invention.

8 is a cross-sectional view of a split type prosthesis manufactured through a method of manufacturing a split type prosthesis according to an embodiment of the present invention.

9 is an exemplary view showing a virtual prosthetic base and a virtual correction base in the manufacturing method of a split type prosthesis according to an embodiment of the present invention.

10 is an exemplary view showing a segmented prosthesis according to another embodiment of the present invention.

The best embodiment of the present invention will be described in more detail below with reference to the accompanying drawings.

Hereinafter, a segmented prosthesis and a manufacturing method thereof according to a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

On the other hand, it is preferable to understand that the target arch to be described below is a jaw for which the segmented prosthetic is required, and the opposing arch is a jaw that occludes with the target arch. Further, the segmented prosthetic is preferably understood as a prosthetic manufactured by dividing a complete prosthetic into at least two or more pieces along the direction of the dental arch. Hereinafter, the split prosthetic will be described and illustrated as being divided into three parts into anterior teeth and both molars.

1 is a flowchart of a method for manufacturing a split prosthesis according to an embodiment of the present invention, and FIG. 2 is a block diagram of a manufacturing system for a split type prosthesis according to an embodiment of the present invention. And, FIG. 3 is an exemplary view showing a planning image applied to the method of manufacturing a segmented prosthesis according to an embodiment of the present invention.

Referring to FIG. 1 , in the manufacturing method of a split prosthesis according to an embodiment of the present invention, a virtual prosthesis base is set (1011), and a virtual bridge base is virtually arranged to overlap the lower end of the virtual prosthesis base (1012). ), the virtual bridge base and the virtual prosthetic base are virtually divided into base ridges on the virtual division surface (1013), the actual divided prosthetic part and the divided metal bridge are manufactured and assembled to finally manufacture the divided prosthesis (1014) includes

Referring to FIGS. 2 and 3 , the method of manufacturing a split prosthesis is performed through a manufacturing system 200 including an imaging device 210, a planning unit 220, and a manufacturing device 230. desirable.

The imaging device 210 is a device for obtaining 3D information about the oral cavity, and it is preferable to understand that the 3D information of the oral cavity includes 3D surface information and alveolar bone information of the oral cavity. It is preferable to understand that the 3D surface information of the oral cavity includes 3D surface information (m2, m3) of the target arch and the opposing arch. The imaging device 210 is preferably understood as a concept encompassing a scanner capable of obtaining 3D surface information of the oral cavity and a CT imaging device capable of obtaining the alveolar bone information m4.

It is preferable to understand that the planning unit 220 is a computer device that collects, calculates, and models information transmitted from an external device through wired/wireless communication and information previously stored in the digital library 240 . The digital library 240 is preferably understood as a database in which three-dimensional external information of components required for dental restoration is stored. In the case of the implant and the abutment, a plurality of pieces of external information may be pre-stored with length, diameter, angle, etc. as optional items. In addition, in the case of the virtual bridge base and the virtual prosthetic base, the external shape information may be pre-stored in a plurality of sizes, such as the size of the teeth and the shape of the dental arch.

The 3D surface information (m2, m3) and the alveolar bone information (m4) of the target arch and the opposing arch are loaded into the planning unit 220 and displayed as images. In addition, through the planning unit 220, the 3D surface information (m2, m3) and the alveolar bone information (m4) of the target arch and the opposing arch are aligned to correspond to a preset vertical diameter (VD), and the planning image (m1). It is preferable to understand that the planning image m1 is an image including basic oral information for obtaining design information of the split prosthesis.

It is preferable to understand that the manufacturing device 230 is a device that manufactures the divided prosthetic part and the divided metal bridge according to the design information of the divided prosthesis. The manufacturing device 230 preferably includes a small CNC lathe or a 3D printer for manufacturing the divided prosthetic part. In addition, it is preferable to understand that the manufacturing device 230 includes a milling device for processing the titanium block according to the design information of the divided metal bridge.

4 is an exemplary diagram illustrating a process of setting placement information in a method of manufacturing a split prosthesis according to an embodiment of the present invention.

Referring to FIGS. 3 and 4 , it is preferable that implant placement information (m5) is set based on the planning image (m1). Here, it is preferable to understand that the implant is a fixture to be placed in the alveolar bone.

Preferably, the placement information m5 is set to correspond to a predetermined placement angle for each tooth position of the target arch. In detail, it is preferable that the placement angle is set according to the direction in which each tooth can be preferably occluded with the opposing arch and the overall shape of the alveolar bone. The placement angle may be set differently for each tooth position according to the direction of each tooth and the overall shape of the alveolar bone.

The placement angle may be calculated and set from an arrangement angle of each tooth image, which will be described later. For example, since the anterior teeth are virtually arranged in a direction protruding forward toward the occlusion end of each tooth image, the placement angle may be set to be inclined forward. And, since each tooth image on the posterior tooth is inclined at a smaller angle than the tooth image on the anterior tooth side, the implantation angle can be set close to the vertical direction.

5A and 5B are exemplary diagrams illustrating a process of generating a virtual split prosthesis and a virtual split bridge in the manufacturing method of a split prosthesis according to an embodiment of the present invention.

4 to 5B, the virtual prosthetic base m170 is set on the planning image m1, and the virtual bridge base m80 is virtually arranged to overlap the lower end of the virtual prosthetic base m170. this is preferable

In detail, it is preferable to understand that the virtual prosthetic base m170 is three-dimensional external information in which a plurality of tooth images m171 are continuously arranged in a preset dental structure. At this time, each of the tooth images m171 may be set as 3D vector data for a standard shape of an actual tooth, and may be set in a virtual arrangement according to the dental structure. Here, while the plurality of tooth images m171 are set and simultaneously loaded and moved from the digital library to the planning unit, the position, angle, and size of each tooth image m171 can be individually adjusted to suit each patient.

Preferably, the virtual prosthetic base m170 is virtually disposed above the 3D surface information m2 of the target arch. Also, it is preferable that the arrangement position and direction of each of the tooth images m171 is adjusted in correspondence with the direction of the dental arch calculated from the 3D surface information m2 of the target arch.

It is preferable that the placement information m5 is set to pass through the longitudinal center of the pre-selected tooth image m171 among the plurality of tooth images m171. It is preferable to set a plurality of tooth images m171 through which the placement information m5 passes, and may be set to 4 to 8. In addition, the implantation information m5 may be inclined at the above angle for each position of the tooth image m171 pre-selected according to the implantation angle for each tooth position.

The virtual bridge base m80 is extracted from the digital library and loaded into the planning unit. Also, it is preferable that the virtual bridge base m80 is virtually arranged to continuously overlap along the lower central portion and both ends of the virtual prosthetic base m170. That is, the virtual bridge base m80 may be virtually arranged as continuous integrated three-dimensional outer appearance information from the anterior tooth image m171 to the molar tooth image m171 of the virtual prosthetic base m170.

At this time, it is preferable to understand that the virtual bridge base m80 is three-dimensional outer shape information in which a plurality of virtual coupling parts m81 are integrally connected through a plurality of virtual extension parts m88. In detail, the virtual bridge base m80 is preferably set to 3D vector data in which the virtual coupling part m81 and the virtual extension part m88 are set, and is pre-stored in the digital library. Here, while the virtual coupling part m81 and the virtual extension part m88 are set and simultaneously loaded and moved, the position of each virtual coupling part m81 can be individually adjusted to correspond to the insertion information m5. there is. In addition, each of the virtual extensions m88 may also be individually adjusted corresponding to the adjusted position of each of the virtual coupling parts m81.

At this time, it is preferable to understand that the virtual coupling part m81 is design information for the coupling part coupled to the upper end of the implant. It is preferable to understand that the coupling part includes a structure coupled directly to the upper end of the implant and a structure coupled to the post of the abutment fastened to the upper end of the fixture. Hereinafter, the virtual coupling part m81 will be described and illustrated in a shape matching the post m10a of the virtual abutment m10, which is the three-dimensional outer shape information of the abutment.

It is preferable that the virtual coupling part (m81) includes a virtual coupling groove (m82), a virtual through portion (m83) and a virtual stepped portion (m84). The virtual coupling groove (m82) is design information of the coupling groove formed in the actual coupling part, and is preferably set to be recessed into an internal shape matching the outer shape of the post (m10a) of the virtual abutment (m10). Also, the virtual through part m83 is design information of a through part formed in an actual coupling part, and is preferably set to communicate with the virtual coupling groove m82. The virtual stepped part (m84) is design information of the stepped part formed on the actual coupling part, and is preferably set to protrude radially inward along the boundary of the virtual coupling groove (m82) and the virtual through-hole (m83). . It is preferable that the center of this virtual coupling part m81 is virtually adjusted to correspond to each of the placement information m5.

Preferably, the virtual extension part m88 is virtually extended so as to integrally connect the virtual couplers m81 adjacent to each other. Here, the virtual extension part m88 may be virtually extended in a bar shape having a square cross section. The virtual extension part m88 may have a height less than or equal to the maximum height of each virtual coupling part m81 and a cross-sectional thickness less than or equal to the maximum diameter of each virtual coupling part m81.

It is preferable that the virtual prosthetic base m170 and the virtual bridge base m80 are simultaneously virtually divided based on a virtual dividing surface m7 set to be spaced apart in plurality along the direction of the dental arch.

It is preferable to understand that the virtual dividing surface m7 is a virtual plane set at at least one or more dividing points spaced apart from each other along the direction of the dental arch. Here, it is preferable that the dividing point be set at at least one virtual interdental interval (m173) selected from a plurality of virtual interdental intervals (m173) between the plurality of tooth images (m171). In addition, the virtual dividing surface m7 is preferably set as a virtual plane disposed in a lingual direction from the labial or buccal side with respect to the virtual interdental surface m173 and extending in the vertical direction.

As such, since the virtual division surface m7 is virtually arranged based on the virtual interdental space m173, the shape of each tooth image m171 can be substantially maintained. In addition, after the virtual prosthetic base m170 is set according to the dental structure, it is virtually divided based on the virtual dividing surface m7. Therefore, while the virtual prosthetic base m170 is divided into a plurality of pieces, each tooth image m171 can substantially maintain continuity.

Accordingly, even if the split prosthesis is manufactured by being divided into a plurality of pieces and then installed in the oral cavity, it may have a substantially similar appearance to the integrated complete prosthesis. Through this, by receiving a high-quality split-type prosthetic with improved aesthetics, the patient's satisfaction with use is significantly improved, and durability against mastication pressure can be remarkably improved.

On the other hand, among the mutually adjacent placement information m5, at least one placement information m5 whose placement angle is included within a preset angle error range is grouped and set to a plurality of divided areas m8a, m8b, and m8c. desirable. For example, as shown in FIG. 5A, a plurality of the placement information m5 set adjacent to each posterior tooth along the dental arch direction may be grouped and set into posterior tooth partition regions m8b and m8c, respectively. In addition, the plurality of placement information m5 set adjacent to the anterior tooth along the dental arch direction may be grouped and set as an anterior tooth-side partitioned area m8a.

Further, it is preferable to understand that a virtual plane intersecting the virtual extension part m88 is virtually disposed between the respective divided areas m8a, m8b, and m8c of the virtual dividing surface m7. At this time, it is preferable that the virtual plane crosses the virtual extension part m88 and at the same time crosses the virtual interdental part m173 virtually disposed within the longitudinal range of the virtual extension part m88. Therefore, the virtual partitioning surface m7 extends between the virtual interdental zone m173 preset between the mutually neighboring partitioning areas m8a, m8b, and m8c and between the mutually neighboring partitioning areas m8a, m8b, and m8c. It can be placed virtually across the virtual extension (m88) at the same time.

Preferably, a virtual assembly groove m177 is set at a portion of the virtual prosthetic base m170 overlapping the virtual bridge base m80. Also, it is preferable that the virtual prosthetic base m170 and the virtual bridge base m80 are simultaneously virtual divided based on the virtual division surface m7. Hereinafter, it is preferable to understand that the virtual split prosthetic unit and the virtual split bridge are design information of the split prosthetic unit and split metal bridge to be described later.

An overlapping area between the virtual prosthesis base m170 and the virtual bridge base m80 may be set as an overlapping area, and as the overlapping area is erased from the virtual prosthetic base m170, the virtual assembly groove m177 ) can be set. It is preferable to understand that the virtual assembly groove m177 is design information of an assembly groove to be described later. Since the virtual assembly groove m177 is set based on the virtual bridge base m80, the coupling precision between the finally manufactured divided metal bridge and the assembly groove can be remarkably improved.

At this time, it is preferable that the virtual assembly groove m177 is set to include an extra interval considering an assembly error between the divided metal bridge and the assembly groove. Therefore, even if the divided metal bridge made of a metal material having a low strain by external force is assembled to the prosthetic split part made of zirconia, damage or breakage of the prosthetic split part due to interference can be prevented. In addition, since the application interval of the adhesive for attaching and fixing the divided metal bridge to the assembly groove is secured, the fixing force can be remarkably improved.

In addition, a virtual communication hole m172 communicating with the virtual assembly groove m177 may be set. The virtual communication hole m172 is design information of a communication hole to be described later, and may be set corresponding to the implantation information m5. That is, the virtual communication hole m172, the virtual through portion m83, and the virtual coupling groove m82 may be substantially communicated with each other. In addition, the fastening screw may be inserted through the communication hole and coupled to the coupling part.

At this time, the virtual assembly groove m177 is continuously set along the dental arch direction of the virtual prosthetic base m170 and then divided based on the virtual dividing surface m7. Through this, adjacent end sides of the virtual assembly grooves m177 set in each prosthetic segment can be set as virtual openings communicating in the direction of the dental arch. Then, the virtual extension part m88 is continuously set along the dental arch direction of the virtual bridge base m80 and then divided based on the virtual dividing surface m7. Through this, the virtually divided virtual extension part m88 can be set as a virtual support end extending from the virtual coupling part m81 included in each of the virtual split bridges to the virtual split surface m7.

As such, the virtual prosthetic base m170 and the virtual bridge base m80 are set as continuous 3D image data along the direction of the dental arch, and are then virtually divided based on the virtual dividing surface m7. Accordingly, the mutually adjacent ends of each of the virtual divided prosthesis parts and the mutually adjacent ends of each of the virtual divided bridges may be divided but set in a substantially continuous arrangement.

Meanwhile, a horizontal alignment line m6 may be set outside the vertical direction of the 3D surface information m2 of the target arch. The alignment line m6 may be set across a space where teeth are disposed between the upper and lower jaws.

It is preferable that the post length of the virtual abutment m10 is selected according to a standard corresponding to the separation distance between the alignment line m6 and the 3D surface information m2 of the target arch. The spacing may be calculated for each location corresponding to the placement information m5. Further, the post length of the virtual abutment m10 may be selected and extracted from the digital library by using the distance calculated for each position corresponding to the implantation information m5 as a selection item. The virtual abutment m10 is virtually arranged corresponding to the implantation information m5, and the virtual coupling part m81 has the virtual coupling groove m82 attached to the post m10a of the virtual abutment m10. ) can be virtually arranged to match.

In detail, the virtual abutment m10 may be virtually aligned to correspond to the alignment line m6. For example, the upper end of the post m10a of the virtual abutment m10 may be virtually aligned to match the alignment line m6. At this time, the alveolar bone information is displayed as an irregular surface, and an alveolar bone height difference occurs between parts corresponding to the implantation information m5. Therefore, when the virtual abutment m10 is virtually overlapped with the virtual bridge base m80, the post of the virtual abutment m10 is spaced according to the post length of the virtual abutment m10. (m10a) may be partially exposed.

Here, it is preferable that the length of the virtual cover extension m85 protruding downward along the edge of the virtual coupling groove m82 is set so that the outer surface of the virtual abutment m10 exposed at the spaced interval is covered. do. And, it is preferable that the end of the virtual cover extension part m85 is set to match the marginal part of the virtual abutment m10.

Through this, when the real divided metal bridge is fixed to the upper end of the implant, the post of the real abutment is prevented from being exposed to the outside, so that aesthetics can be remarkably improved. In addition, a cover extension formed in real life based on the virtual cover extension (m85) may substantially shield the post of the abutment. Through this, it is possible to prevent foreign substances from penetrating between the coupling groove and the post of the abutment.

Moreover, the substantial upper and lower thickness of the divided metal bridge can be formed to a minimum, and each of the divided prosthesis parts can be inserted only on the root side. Through this, projection of the divided metal bridge onto the divided prosthetic part made of zirconia or an oligomer resin material can be prevented, and aesthetics can be remarkably improved.

In addition, the virtual coupling part m81 and the virtual extension part m88 are designed in a simple way in which standard design information pre-stored in the digital library is loaded and virtually arranged at a position corresponding to each placement information m5. In addition, the cross-sectional shape of the virtual extension part m88 is set to simplified design information corresponding to a square. Therefore, since design information of the virtual assembly groove m177 set in correspondence with the virtual bridge base m80 as well as design information of the virtual bridge base m80 is simplified and streamlined, design convenience and speed can be remarkably improved. there is.

6A is a projected bottom view of a split prosthesis manufactured according to the manufacturing method of a split prosthesis according to an embodiment of the present invention, and FIG. It is a partially cut-away perspective view of a split metal bridge.

5A to 6B, the virtual split prosthetic part and the virtual split bridge are transmitted to the manufacturing device, and the real split

prosthetic part

170a, 170b, 170c and the real

split metal bridge

80a, 80b , 80c) are preferably prepared respectively. At this time, in the present invention, the divided

prosthetic parts

170a, 170b, and 170c are described and illustrated as being made of a zirconia material as an example. Of course, in some cases, the

split prosthesis parts

170a, 170b, and 170c may be made of an oligomer resin material, and generally, any material used to manufacture prosthetic artificial teeth falls within the scope of the present invention.

In detail, referring to FIG. 6A , the divided

prosthesis parts

170a, 170b, and 170c preferably include an artificial tooth part 171 and the assembly groove 177, and a communication hole communicating with the assembly groove 177. (172) may be formed through the position corresponding to the placement information.

At this time, it is preferable that the opening 178 is formed at the adjacent ends of the divided

prosthesis parts

170a, 170b, and 170c adjacent to each other. The opening 178 is opened from the assembly groove 177 toward the dental arch. Accordingly, the assembly grooves 177 formed in the divided

prosthesis parts

170a, 170b, and 170c may continuously communicate in the direction of the dental arch.

Here, the divided

prosthetic parts

170a, 170b, and 170c are formed when a zirconia block is CNC-processed corresponding to the 3D design information of the virtual divided prosthetic part and then fired at a preset temperature. ) can be manufactured in real life. It is preferable to understand that the zirconia block is manufactured in a block shape by injecting a mixture of zirconia-based materials including zirconia powder into a compression molding mold and applying a certain pressure thereto.

And, referring to FIG. 6B, the divided

metal bridges

80a, 80b, and 80c preferably include the coupling portion 81 and the extension portion 88. In detail, the coupling portion 81 preferably includes the coupling groove 82, the through portion 83, and the stepped portion 84.

The coupling groove 82 is a portion into which the post of the abutment is inserted, and is formed with an opening on one side of the upper and lower sides of the coupling portion 81 . The through portion 83 is a portion into which the fastening screw is inserted, and is opened to the other side of the coupling portion 81 and communicates with the coupling groove 82 . The stepped portion 84 protrudes in a ring shape in a radially inward direction at the boundary between the coupling groove 82 and the through portion 83 . At this time, the inner diameter of the stepped portion 84 may be formed to be smaller than the diameter of the head portion of the fastening screw and exceed the outer diameter of the screw portion protruding from the head portion.

It is preferable that at least one end of each of the divided

metal bridges

80a, 80b, and 80c is formed with a continuous support end 87 integrally extending from the coupling part 81 and inserted into the opening 178. The continuous support end 87 is formed by using the virtual support end set by virtually dividing one or more of the plurality of virtual extension parts based on the virtual dividing surface as design information. Therefore, even if each of the divided

metal bridges

80a, 80b, and 80c is formed by being divided into a plurality of pieces, the mutually adjacent continuous support ends 87 may be substantially continuously arranged. At this time, it is preferable to understand that the continuous arrangement means that the facing end surfaces of each of the continuous support ends 87 are substantially adjacent and face each other without shifting forward or backward or up and down. Therefore, each of the continuous support ends 87 may be arranged in a form substantially similar to the extension part 88 extending integrally while being provided in a form divided in the longitudinal direction.

Each of the continuous support ends 87 may be inserted into the opening 178 formed in each of the divided

prosthetic parts

170a, 170b, and 170c. Accordingly, the divided

metal bridges

80a, 80b, and 80c may be continuously inserted below the divided

prosthesis parts

170a, 170b, and 170c along the direction of the dental arch. Accordingly, the divided

metal bridges

80a, 80b, and 80c may continuously support the divided

prosthesis parts

170a, 170b, and 170c along the direction of the dental arch. Through this, even if a mastication pressure is applied to each adjacent end side of the divided

prosthesis parts

170a, 170b, and 170c, durability can be remarkably improved.

In addition, the cover extension 85 preferably protrudes downward along the rim of the coupling groove 82 . At this time, it is preferable that the cover extension part 85 protrudes with an extension length corresponding to the exposed length of the post of the abutment exposed at the spaced interval. Therefore, in a state in which the abutment is fastened to the top of the implant and the

split metal bridges

80a, 80b, and 80c are fixed to the top of the abutment, the target arch and the

split metal bridges

80a, 80b, 80c) The outer surface of the post of the abutment exposed through the gap may be covered.

The divided

metal bridges

80a, 80b, and 80c are preferably formed of titanium, which is a biocompatible metal having high strength and excellent corrosion resistance. In detail, the divided

metal bridges

80a, 80b, and 80c are preferably manufactured by milling and anodizing a titanium material based on the virtual divided bridge.

7A and 7B are exemplary diagrams illustrating a manufacturing process of a final split prosthesis in the method of manufacturing a split type prosthesis according to an embodiment of the present invention, and FIG. 8 is a manufacturing process of a split type prosthesis according to an embodiment of the present invention. It is a cross-sectional view of the split prosthesis manufactured through the method.

Referring to FIGS. 7A to 8 , the divided

metal bridges

80a, 80b, and 80c are assembled and fixed to the divided

prosthesis parts

170a, 170b, and 170c to finally manufacture the divided prosthesis 190. desirable.

Preferably, the

split metal bridges

80a, 80b, 80c, and 80 are fixed to the target arch 2. The fixture 9 is placed in the target arch 2 at each position corresponding to the placement information, and the abutment 10 is fastened to the upper side of the fixture 9 . The divided

metal bridges

80a, 80b, 80c, and 80 are disposed above the abutment 10, and the fastening screw 174 penetrates the coupling part 81 to the abutment 10. fastening is fixed When the divided

metal bridges

80a, 80b, 80c, and 80 are fixed to the target arch 2, each of the continuous support ends 87 of the mutually adjacent divided

metal bridges

80a, 80b, 80c, and 80 They may be arranged adjacently in a substantially continuous arrangement. Also, the post 10a of the abutment 10 may be entirely covered through the cover extension 85 .

Referring to FIGS. 7B and 8 , each of the assembly grooves 177 formed in the split

prosthetic parts

170a, 170b, 170c, and 170 is inserted into the opening 178 so that the continuous support end 87 is inserted. Preferably, the divided

metal bridges

80a, 80b, 80c, and 80 are inserted. At this time, since the divided

metal bridges

80a, 80b, 80c, and 80 are fixed to the abutment 10, each of the divided

prosthetic parts

170a, 170b, 170c, and 170 are each of the divided metal bridges 80a. , 80b, 80c, 80) can be assembled under pressure after being disposed on the upper part.

Here, each of the divided

prosthesis parts

170a, 170b, 170c, and 170 and each of the divided

metal bridges

80a, 80b, 80c, and 80 are divided and formed based on the divided area. That is, at least one coupling part 81 included in each of the divided

metal bridges

80a, 80b, 80c, and 80 is formed according to a substantially similar installation angle included in the angle error range. Accordingly, each of the divided

metal bridges

80a, 80b, 80c, and 80 is formed such that twist is minimized along the longitudinal direction and coupling directions substantially correspond along the longitudinal direction.

At this time, since each of the assembly grooves 177 is also formed to substantially correspond to the outer shape of each of the divided

metal bridges

80a, 80b, 80c, and 80, assembly accuracy can be remarkably improved. In addition, when the divided

metal bridges

80a, 80b, 80c, and 80 are inserted into the assembly grooves 177, interference due to twisting can be minimized. Therefore, after the divided

metal bridges

80a, 80b, 80c, and 80 are inserted into the assembly grooves 177, pressure is applied to the divided

prosthetic parts

170a, 170b, 170c, and 170 due to restoring force, resulting in fracture. Problems that arise can be prevented.

In addition, each of the divided

prosthesis parts

170a, 170b, 170c, and 170 is divided based on each artificial interdental space 173 corresponding to the virtual interdental space. Therefore, each artificial tooth portion 171 adjacent to each other may be disposed in a substantially continuous dental structure based on the artificial interdental space 173. Through this, since the split prosthesis 190 is provided in an integral shape as a whole along the direction of the dental arch, aesthetics can be remarkably improved.

At this time, it is preferable that the adhesive is applied between the assembly groove 177 and the divided

metal bridges

80a, 80b, 80c, and 80. In addition, when the upper and lower jaws are occluded, the positions of each of the

prosthetic split parts

170a, 170b, 170c, and 170 may be adjusted to precisely occlude with the opposing arch within the range of the margin, and then attached and fixed. In addition, resin is injected and cured between adjacent ends of the divided

prosthetic parts

170a, 170b, 170c, and 170 so that the divided

prosthetic parts

170a, 170b, 170c, and 170 are integrally formed along the direction of the dental arch. Fixed is preferred. Through this, the split prosthesis 190 may be finally manufactured.

As described above, according to the present invention, assembly accuracy and ease of assembly can be improved as the prosthetic part and the bridge part are divided according to the placement angle for each tooth position. In addition, a substantially integrated prosthesis can be provided by a simple method in which adjacent ends adjacent to each other are attached through the resin. In this case, between the

prosthetic split parts

170a, 170b, 170c, and 170 may be shielded from the external environment through the resin. Accordingly, penetration of foreign substances such as food scraps between the divided

prosthetic parts

170a, 170b, 170c, and 170 can be fundamentally prevented, and hygiene and management convenience can be remarkably improved.

In addition, a color layer 191 may be further included at the lower end of the split prosthesis 190 . In detail, a paint composition having a predetermined viscosity may be laminated and applied to the lower end of the split prosthesis 190 to a predetermined thickness. In this case, the coating composition may include a base powder made of the same material as the prosthetic base and a powder formulation including a preset pigment to be expressed in a color corresponding to the target arch. Paint compositions for each color may be coated in multiple layers on the outside of the lower end of the split prosthesis 190 . Through this, the coloring layer 191 can develop a gradation of color similar to that of the actual gum, and the aesthetics of the final split prosthetic on which the coloring layer is formed can be remarkably improved.

9 is an exemplary view showing a virtual prosthetic base and a virtual correction base in the method of manufacturing a split type prosthesis according to an embodiment of the present invention.

Referring to FIG. 9 , the virtual prosthetic base m170 set based on the planning image m1 is preferably reset to an enlarged virtual correction base m170A including a preset contraction tolerance. In detail, it is preferable that each of the tooth images m171 is reset to the three-dimensional outer shape information of the outwardly enlarged virtual corrective tooth portion m171A including the preset first shrinkage tolerance e1. Also, the virtual assembly groove m177 is preferably corrected with a virtual correction assembly groove m177A whose internal space is enlarged to exceed the volume of the virtual bridge base including the preset second shrinkage tolerance e2.

Here, the first shrinkage tolerance e1 is preferably set to a value that allows the volume of the virtual correction base m170A to be expanded by 10 to 20% with respect to the volume of the virtual prosthetic base m170. That is, the volume of the virtual prosthetic base m170A may be set to be enlarged at a volume ratio of 10 to 20% with respect to the volume of the virtual prosthetic base m170. Further, the second shrinkage tolerance e2 is preferably set to a value that allows the volume of the virtual corrective assembly groove m177A to be expanded by 10 to 20% in volume ratio with respect to the volume of the virtual assembly groove m177. . That is, the volume of the virtual calibration assembly groove m177A may be set to be enlarged at a volume ratio of 10 to 20% with respect to the volume of the virtual assembly groove m177.

The virtual correction base m170A and the virtual correction assembly groove m177A allow the three-dimensional image of the virtual prosthetic base m170 and the virtual assembly groove m177 to contract in the transverse direction, longitudinal direction, and overall outward direction. Virtually enlarged and set including tolerances (e1, e2). Therefore, compared to the virtual prosthesis base m170, the virtual correction base m170A has an overall volume while the shape of each tooth image m171 and the virtual correction tooth portion m171A and the curvature in the direction of the dental arch correspond to each other. This magnification can be corrected.

Here, the curvature in the direction of the dental arch and the position of the placement information may also be reset to a position considering the volume ratio of the virtual prosthetic base m170 enlarged and corrected by the virtual correction base m170A. That is, if the placement information is set to the lateral incisor, first premolar, and molar of the virtual prosthetic base m170, the placement information may also be set to the lateral incisor, first premolar, and molar in the virtual correction base m170A.

As such, the contraction error generated during CNC machining and firing of the zirconia block may be already taken into consideration during the design process of the split prosthesis and manufactured. Through this, even if shrinkage occurs in the firing process of the divided prosthetic part, the size/volume of the finally formed divided prosthetic part can be formed to substantially correspond to the size/volume of the virtual divided prosthetic part.

Furthermore, it is preferable that the second shrinkage tolerance e2 applied to the virtual correction assembly groove m177A is set by further including a clearance for the clearance between the virtual bridge base and the virtual assembly groove m177. Through this, the divided metal bridge can be easily assembled without interfering with the assembly groove. In addition, when the split prosthetic part is placed on the target arch so that the split metal bridge is inserted into the assembly groove and then occluded with the opposing arch, the split prosthetic part can be moved to an accurate occlusion position within the marginal distance range. Also, the moved divided prosthetic part can be attached and fixed without unnecessary movement later as the adhesive hardens.

10 is an exemplary view showing a segmented prosthesis according to another embodiment of the present invention. In this embodiment, the basic configuration except for the assembling protrusion 86b and the mold groove 177c is the same as that of the above-described embodiment, so a detailed description of the same configuration will be omitted.

Referring to FIG. 10 , a plurality of assembly protrusions 86b may protrude on at least one side of the inner and outer surfaces facing the upper surface of the extension part 88 and the assembly groove 177 in correspondence with the insertion angle. In addition, a molded groove 177c into which the assembling protrusion 86b is molded may be recessed on the other side of the inner and outer surfaces facing the upper surface of the extension part 88 and the assembling groove 177 .

In detail, the assembling protrusions 86b are preferably formed in plural spaced apart along the upper surface of each of the divided metal bridges 80, and may have a circular, elliptical or polygonal cross-sectional shape in the transverse direction. At this time, the assembling protrusion 86b may protrude into a pillar shape having substantially the same cross-sectional shape as the upper end and the lower end.

Here, the design information of the assembling protrusion 86b and the mold groove 177c may be set based on the planning image. In detail, a plurality of virtual assembly protrusions may be set to protrude on at least one side of the upper surface of the virtual extension part and the facing inner and outer surfaces of the virtual assembly groove in correspondence with the insertion angle. In addition, a virtual molded groove recessed corresponding to the volume of the virtual assembly protrusion may be set on the other side of the upper surface of the virtual extension part and the inner and outer surfaces facing each other of the virtual assembly groove. Here, at least one of the plurality of virtual assembling protrusions may have a virtual direction alignment surface aligned with an implant placement direction set on an outer surface.

As described above, the present invention is not limited to the above-described embodiments, and it is possible to modify and implement the present invention by those skilled in the art without departing from the scope claimed in the claims of the present invention. And, such modifications fall within the scope of the present invention.

The present invention can be applied to the manufacturing industry of dental restoration products.

Claims

A first step in which a virtual prosthetic base in which a plurality of tooth images are continuously arranged is set based on a planning image generated through a planning unit;

a second step of extracting a virtual bridge base from the digital library, loading it into the planning unit, and virtually arranging the virtual prosthetic base so that it continuously overlaps along the lower center and both ends of the virtual prosthetic base;

a third step in which a virtual assembly groove is set at a portion where the virtual bridge base overlaps with the virtual prosthesis base, and the virtual prosthetic base and the virtual bridge base are simultaneously virtual divided based on a virtual dividing surface in which a plurality of spaces are set; and

The virtually divided virtual prosthetic base and the virtual bridge base are transmitted to a manufacturing device to manufacture a divided prosthetic part and a divided metal bridge, respectively, and each of the divided metal bridges is assembled and fixed to each of the divided prosthetic parts to form a divided type prosthesis. A manufacturing method of a segmented prosthesis comprising a fourth step of final manufacturing.
According to claim 1,

In the third step, the virtual division surface is a virtual plane set at at least one or more division points spaced apart from each other along the direction of the dental arch.
According to claim 2,

In the third step, the dividing point is set to at least one or more virtual teeth selected from a plurality of virtual teeth between the plurality of teeth images.
According to claim 2,

The first step includes a step of setting a plurality of implant placement information along the direction of the dental arch, wherein the placement information is a pre-selected tooth image among a plurality of tooth images so as to correspond to a predetermined implant head for each tooth position. It is set to penetrate the center in the longitudinal direction,

In the third step, the virtual division surface is

Grouping and setting at least one mutually adjacent implantation information in which the implantation angle is within a predetermined angular error range;

The method of manufacturing a segmented prosthesis, characterized in that it is set by including the step of arranging the virtual plane between each of the divided regions.
According to claim 4,

The second step includes a step of virtually aligning the virtual coupling part of the virtual bridge base to a position corresponding to the placement information,

In the third step, the virtual division surface is

A method of manufacturing a split-type prosthesis, characterized in that it is virtually arranged across virtual extensions that are virtually extended so as to continuously connect the virtual couplings adjacent to each other.
According to claim 5,

The third step is

dividing the virtual prosthetic base on the basis of the virtual division surface and setting adjacent ends of the virtual assembly grooves adjacent to each other as virtual openings communicating in the direction of the dental arch;

and dividing the virtual extension part based on the virtual division surface and setting the virtual support end extending from the virtual coupling part to correspond to the inner shape of each virtual opening. .
According to claim 5,

The second step is

Virtually adjusting the center of each of the virtual couplers to correspond to each of the placement information;

and virtually extending each of the virtual extension parts so as to integrally connect the virtual coupling parts adjacent to each other.
According to claim 5,

In the second step, the virtual extension part is set in a bar shape.
According to claim 5,

In the fourth step,

fixing each of the divided metal bridges to the upper end of the implant placed in the target arch through fastening screws;

inserting each of the divided metal bridges into assembling grooves formed in each of the divided prosthesis parts and fixing the divided metal bridges through adhesives so that continuous support ends corresponding to the virtual support ends are inserted into openings formed corresponding to the virtual openings;

The method of manufacturing a split prosthesis comprising the steps of injecting and curing a resin between adjacent ends of each of the split prostheses and integrally fixing them.
According to claim 1,

The second step is

Virtually arranging the virtual bridge base based on an alignment line set outside the three-dimensional surface information of the target arch;

extracting a virtual abutment from the digital library and loading it into the planning unit;

virtual alignment of the virtual abutment corresponding to the alignment line;

The extension length of the virtual cover extension protruding downward along the edge of the virtual coupling groove set in the virtual coupling portion is set so that the outer surface of the virtual abutment exposed between the virtual bridge base and the three-dimensional surface information of the target arch is covered A method of manufacturing a segmented prosthesis, comprising the step of being.
The outer shape is set to correspond to the virtual prosthetic base in which a plurality of tooth images are continuously arranged, and an assembly groove corresponding to the outer shape of the virtual bridge base is formed on the lower inner surface so that the virtual coupling part is continuously and integrally connected through the virtual extension part. , Split prosthetic units divided based on a virtual dividing surface set between a plurality of selected virtual teeth as at least one of virtual teeth between the tooth images and provided in a plurality; and

It is made of a metal material including a plurality of coupling parts coupled to the implant based on the virtual bridge base and a plurality of extension parts integrally connecting the coupling parts, and at least one of the plurality of extension parts is the virtual dividing surface A split prosthetic comprising a split metal bridge divided on the basis of a plurality of split metal bridges.
According to claim 11,

An opening opening from the assembly groove toward the dental arch is formed at an adjacent end side of each of the divided prosthesis parts so that the assembly groove formed in each of the divided prosthetic parts continuously communicates in the direction of the dental arch;

Split-type prosthesis, characterized in that at least one end of each of the divided metal bridges is formed with a continuous support end integrally extending from the coupling part and inserted into the opening.
According to claim 11,

The coupling portion includes a coupling groove corresponding to the shape of the upper end of the implant, a through portion into which a fastening screw is inserted, and a stepped portion projecting radially inward at a boundary between the coupling groove and the through portion,

It is fastened to the top of the implant and protrudes downward along the rim of the coupling groove so that the outer surface of the post of the abutment exposed between the split metal bridge and the target arch is covered, but formed with an extension length corresponding to the exposed length of the post. Split-type prosthesis further comprising a cover extension.
According to claim 11,

A split prosthesis, characterized in that a plurality of assembling protrusions protrude on at least one side of an upper surface of the extension part and an inner and outer surface of the assembly groove facing each other, and a molded groove into which the assembling protrusions are molded is recessed on the other side.