WO2022203128A1

WO2022203128A1 - Method for manufacturing digital dental prosthesis

Info

Publication number: WO2022203128A1
Application number: PCT/KR2021/009294
Authority: WO
Inventors: 김진철; 김진백
Original assignee: 주식회사 디오
Priority date: 2021-03-26
Filing date: 2021-07-20
Publication date: 2022-09-29

Abstract

In order to improve precision and aesthetics, the present invention provides a method for manufacturing a digital dental prosthesis comprising: a first step for generating a planning image; a second step for re-setting, as three-dimensional surface information of a virtual correction base that includes a preset first shrinkage tolerance and is expanded toward the outside, three-dimensional surface information of a virtual dental prosthesis base on which a virtual artificial tooth part that matches surface information of an opposing dental arch so as to occlude therewith is arranged and of which an inner surface portion is set on the basis of the surface information of a target arch; a third step for transmitting the three-dimensional surface information of the virtual correction base to a manufacturing apparatus so as to form, as a real product, a preliminary base made of a zirconia material, wherein a dental prosthesis base that is contracted to a volume corresponding to the virtual dental prosthesis base is manufactured by plastic processing of the preliminary base; and a fourth step for manufacturing a final digital dental prosthesis.

Description

Digital prosthesis manufacturing method

The present invention relates to a method for manufacturing a digital prosthesis, and more particularly, to a method for manufacturing a digital prosthesis with improved precision and aesthetics.

In general, a prosthesis (dental prosthesis) is an artificial periodontal tissue in the oral cavity that artificially restores appearance and function by replacing missing natural teeth.

In detail, the prosthesis includes an artificial tooth part in which a plurality of artificial teeth replacing the lost natural teeth are arranged or connected to a dental arch corresponding to the arch shape of the restoration target, and the lower end of the artificial tooth part is connected to the artificial tooth part integrally. It may further include an artificial gum that wraps and connects. At this time, a plurality of implants are spaced apart along the jaw to be implanted in the restoration target gum, and a coupling portion corresponding to an implantation position of the implant may be formed in the prosthesis.

Here, the conventional prosthesis has a structure in which the coupling part is integrally formed in the shape of a coupling groove on the inner surface part that is seated and supported on the restoration target gum, or the coupling part is formed in the shape of a buried hole and a support cylinder is embedded and fixed in the buried hole. can be divided into

At this time, in the former case, the lower part of the prosthesis is formed of a metal frame to prevent damage due to electric charge between the abutment formed of a metal material and the coupling groove during the fastening process using a screw. That is, the coupling groove is formed in the metal frame at a position corresponding to the placement position of the implant, and as the separately manufactured artificial tooth is assembled and attached to the upper side of the metal frame, the prosthesis can be manufactured.

Here, the metal frame is manufactured through a method such as investment casting, and as the manufacturing process is complicated and the manufacturing takes a long time, there is a problem in that the cost increases and the dental restoration is delayed.

And, in the latter case, it is mainly manufactured by 3D printing using an oligomeric acrylic synthetic resin as a material. Although the manufacturing time is fast and the manufacturing method is easy, there is a problem that the strength is relatively weak.

In order to solve the above problems, an object of the present invention is to provide a digital prosthetic manufacturing method with improved precision and aesthetics.

In order to solve the above problems, the present invention provides a first step of generating a planning image in which surface information and alveolar bone information of a restoration target arch and an opposing arch are displayed as a three-dimensional image aligned corresponding to a preset vertical height; Three-dimensional surface information of a virtual prosthetic base in which virtual artificial tooth parts matching the surface information of the antagonistic arch and occlusal matching with the surface information of the opposing arch are arranged on the outer surface side according to the dental arch line of the alveolar bone information, and the inner part is set based on the surface information of the target arch a second step of resetting the three-dimensional surface information of the virtual prosthetic base to the three-dimensional surface information of the virtual correction base enlarged to the outside including a preset first shrinkage tolerance; The three-dimensional surface information of the virtual correction base is transmitted to a manufacturing device, so that a preliminary base made of zirconia is formed as a real thing, and the preliminary base is plasticized at a preset temperature and contracted to a volume corresponding to the virtual prosthetic base. A third step in which is produced; and a fourth step of manufacturing a final digital prosthesis through the prosthetic base.

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

First, the shrinkage error that occurs as the zirconia block, which is a material for dental restoration, which has the durability to stably support the masticatory pressure, is shrunk during the plastic treatment is taken into account in the prosthetic design process. Then, the design information of the prosthesis is enlarged and corrected by a preset contraction ratio. Accordingly, when the finally manufactured digital prosthesis is installed in the oral cavity, the occlusal precision with the opposing teeth can be significantly improved.

Second, the gap between the posterior ends of the preliminary artificial teeth is supported through the anti-deformation support part connected along the side from the anterior to the both molars of the prosthetic base. Accordingly, it is possible to prevent the preliminary base from being contracted or torsionally deformed due to excessive shrinkage in the horizontal direction when the preliminary base is plasticized. Therefore, even when the preliminary base is contracted to the prosthetic base, the position of the preformed buried hole is precisely matched with the implant/abutment placed in the oral cavity, so that the installation precision can be significantly improved.

Third, support ribs connecting the gap between the anti-deformation support part and the inner and outer surfaces facing the prosthetic base are radially formed to connect the inner and outer surfaces. Accordingly, it is possible to prevent in advance from being deformed or damaged while the support rib is contracted during the plastic treatment of the preliminary base. Accordingly, it is possible to prevent in advance that the gap between both ends of the posterior teeth is excessively narrowed compared to the previously established design information due to excessive contraction of the preliminary base during the plasticizing process. In addition, if the support rib in the form of a thin bridge is cut, the anti-deformation support part can be easily separated from the prosthetic base, so that the operation convenience can be significantly improved.

Fourth, the paint composition includes the same material as the prosthetic base made of zirconia material, and is applied and fired to match the gum color of the restoration target arch at the lower end of the prosthetic base. Accordingly, since the fixing force is improved through the high degree of fusion between the prosthetic base and the same type of material, the service life can be significantly extended by preventing peeling and scratching of the color developing layer. In addition, the color development layer is formed by applying multiple coating compositions including the target arch-matching pigment. Therefore, it is possible to provide a high-quality prosthetic with a minimal sense of heterogeneity with the actual oral tissue.

Fifth, after applying the color development layer, in the secondary firing treatment, the firing treatment at a lower temperature than the primary firing treatment for a short time is repeated 2-3 times. Accordingly, the durability of the prosthetic base can be significantly improved because secondary shrinkage of the already plasticized prosthetic base is prevented, and the multi-colored layer applied to a predetermined thickness can be firmly attached and cured to the prosthetic base.

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

2 is an exemplary view showing a planning image in the digital prosthesis manufacturing method according to the present invention.

3 is an exemplary view illustrating a virtual prosthetic base and a virtual correction base in a digital prosthetic manufacturing method according to an embodiment of the present invention.

4A and 4B are exemplary views comparing volume ratios of a virtual prosthetic base and a virtual correction base in a method for manufacturing a digital prosthesis according to an embodiment of the present invention.

5 is an exemplary view showing a preliminary base in the digital prosthesis manufacturing method according to an embodiment of the present invention.

6 is an exemplary view showing a fixing process of the support cylinder in the digital prosthesis manufacturing method according to an embodiment of the present invention.

7 is an exemplary view showing a confirmation process of a final digital prosthesis in the digital prosthesis manufacturing method according to an embodiment of the present invention.

8 is an exemplary view illustrating a process of forming a chromophoric layer in a method for manufacturing a digital prosthesis according to an embodiment of the present invention.

9 is a flowchart of a method for forming a color development layer according to an embodiment of the present invention.

10 is a flowchart of a modified example of a method for forming a chromophoric layer according to an embodiment of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The best embodiments of the present invention will be described in more detail below with reference to the accompanying drawings.

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

1 is a flowchart of a digital prosthesis manufacturing method according to an embodiment of the present invention, and FIG. 2 is an exemplary diagram illustrating a planning image in the digital prosthetic manufacturing method according to the present invention.

1 to 2, the digital prosthesis manufacturing method according to the present invention includes generating a planning image and setting implantation information (1011), setting a virtual prosthetic base and resetting the virtual prosthetic base to a virtual correction base (1012), It includes a series of steps such as prosthetic base fabrication 1013 and final digital prosthetic fabrication 1014 .

On the other hand, the restoration target arch to be described below is preferably understood as a jaw that requires dental restoration through the digital prosthesis, and the opposing jaw is preferably understood as a jaw that occludes the restoration target arch. In this case, in the present invention, the restoration target arch is a mandible as an edentulous jaw, and the opposing arch is an upper jaw that is a dentulous jaw. Of course, in some cases, the present invention can be equally applied to the manufacturing process of a digital prosthesis to be installed when both the maxilla and the mandible are edentulous.

The digital prosthesis manufacturing method is preferably performed through a digital prosthesis manufacturing system including an imaging device, a planning unit, and a manufacturing device.

At this time, the imaging device is to acquire three-dimensional surface information (m2, m3) and alveolar bone information (A) for the restoration target arch and the opposing arch, and it is understood as a concept encompassing an oral scanner and a CT imaging device. desirable. In detail, surface information about the outer surface of the gum part of the restoration target arch and the opposing arch is acquired as a three-dimensional image by using the oral scanner. Then, the alveolar bone information (A) capable of confirming the shape, curvature, density, and position of the inferior alveolar nerve of the alveolar bone is obtained using the CT imaging device.

It is preferable to understand that the planning unit is a computer device that collects, calculates, and models information transmitted from an external device through wired/wireless communication and information pre-stored in the planning unit. That is, the three-dimensional surface information (m2, m3) and the alveolar bone information (A) of the restoration target arch and the opposing arch obtained through the imaging device are loaded into the planning unit and displayed as a three-dimensional image.

In addition, the three-dimensional surface information (m2, m3) and the alveolar bone information (A) of the restoration target arch and the opposing arch are aligned to correspond to a preset vertical height (VD), and a planning image for designing the digital prosthesis ( M) can be created. In addition, in the planning image (M), it is preferable that the implant placement information (B) is arranged in plurality by being spaced apart from each other along the dental arch line of the alveolar bone. Here, the dental arch line is preferably understood as a shape in which an imaginary line connecting the positions where the teeth are actually arranged extends in an arc shape. In addition, it is preferable to understand that the implant in the present invention is a fixture.

It is preferable to understand that the manufacturing apparatus is an apparatus for manufacturing a real digital prosthesis according to the design information of the digital prosthesis. At this time, it is preferable to understand that the manufacturing apparatus applied to the present invention is a small CNC lathe that processes a zirconia block to be described later according to the design information of the digital prosthesis.

3 is an exemplary view illustrating a virtual prosthetic base and a virtual correction base in a digital prosthesis manufacturing method according to an embodiment of the present invention, and FIGS. 4A and 4B are a virtual prosthesis in the digital prosthesis manufacturing method according to an embodiment of the present invention. It is an exemplary diagram comparing the volume ratio of the base and the virtual correction base. At this time, it is preferable to understand that the virtual prosthetic base m70 is shown by the dashed-dotted line in FIGS. 3 to 4B and the virtual correction base m70A is shown by the solid line.

2 to 4B , it is preferable that the three-dimensional surface information of the virtual prosthetic base m70 is set in the planning image M. In this case, the virtual prosthetic base m70 has virtual artificial tooth parts m71 matching the three-dimensional surface information m3 of the opposing maxilla and occlusal matching on the outer surface part m701 side along the dental arch line. In addition, it is preferable that the inner surface portion m702 of the virtual prosthetic base m70 is set based on the three-dimensional surface information m2 of the restoration target arch. For example, the inner surface portion m702 of the virtual prosthetic base m70 has a three-dimensional surface information m2 and a predetermined It may be set to be spaced apart by an interval. Alternatively, the inner surface m702 of the virtual prosthetic base m70 may be set to match the three-dimensional surface information m2 of the restoration target arch.

It is preferable that the three-dimensional surface information of the virtual prosthetic base m70 is set in a form in which a plurality of virtual artificial teeth m71c individually matched to each tooth position corresponding to the actual tooth shape are arranged in correspondence to the dental arch line. . In addition, the plurality of virtual artificial teeth m71c may be set to be integrally connected and stored as 3D surface information of the virtual artificial tooth part m71.

Here, it is preferable that the implantation information B is superimposed on the three-dimensional surface information of the virtual artificial tooth part m71. In addition, it is preferable that a virtual buried hole m72 is set at a position corresponding to the implantation information B. In this case, it is preferable to understand that the virtual buried hole m72 is three-dimensional design information of a buried hole, which is a part in which the support cylinder to be described later is buried and fixed. Here, the support cylinder is fixed to the prosthetic base to be described later, and it is preferable to understand it as a part coupled with the abutment fastened to the upper end of the implant so that the digital prosthesis finally manufactured is fixed to the oral cavity.

As such, when the virtual buried hole m72 is formed in the virtual artificial tooth part m71, 3D surface information of the virtual prosthetic base m70 may be generated. Here, it is preferable that the 3D surface information of the virtual prosthetic base m70 is set as a 3D image corresponding to the size/volume of the final digital prosthesis, which will be described later.

In this case, the virtual buried hole m72 is preferably formed in a cylindrical shape exceeding the maximum cross-sectional area of the support cylinder or the maximum cross-sectional area of the upper end excluding the protrusion protruding from the lower end of the support cylinder. In addition, it is preferable that the center line of the virtual buried hole m72 matches the implantation information B and is virtually arranged. As such, the virtual buried hole m72 may be set to have an inner diameter exceeding the outer diameter of the support cylinder. Through this, the inner diameter of the virtual buried hole m72 may be set in consideration of a gap filled with an adhesive for attaching and fixing the support cylinder to the prosthetic base.

Meanwhile, it is preferable that the three-dimensional surface information of the virtual prosthetic base m70 is reset to the three-dimensional surface information of the enlarged virtual correction base m70A including the preset first shrinkage tolerance e1. In addition, it is preferable that the virtual buried hole m72 is corrected with a virtual corrected buried hole m72A that is enlarged to the outside including the preset second shrinkage tolerance e2.

Here, it is preferable that the first shrinkage tolerance e1 is set such that the volume of the virtual correction base m70A is expanded by a volume ratio of 10 to 20% with respect to the volume of the virtual prosthetic base m70. In addition, the second shrinkage tolerance e2 is preferably set such that the volume of the virtual correction buried hole m72A is enlarged by 10 to 20% by volume with respect to the volume of the virtual buried hole m72. At this time, the second shrinkage tolerance e2 is the same as that the inner diameter of the virtual correction buried hole m72A is set to expand at a length ratio of 10 to 20% with respect to the inner diameter of the virtual buried hole m72. It is understood to have the same meaning. This is preferable.

In detail, when the three-dimensional surface information of the virtual prosthetic base m70 is set, it is preferable that the set three-dimensional image is virtually enlarged in the lateral direction, the longitudinal direction, and the overall outer direction including the first shrinkage tolerance e1. Accordingly, the virtual prosthetic base m70 may be reset to 3D surface information of the virtual correction base m70A. Here, it is preferable to understand that the virtual correction base m70A has an enlarged overall volume while the shape of each of the virtual artificial teeth m71c and the curvature of the dental arch line correspond to the virtual prosthetic base m70.

At this time, the position of the dental arch line and the placement information B may also be reset to a position in consideration of the volume ratio of the enlarged and corrected virtual correction base m70A. That is, as shown in the figure, when the implantation information (B) is set to overlap the lateral incisors and the second premolars on the virtual prosthetic base m70, the implantation information ( B) can be set.

Through this, the virtual correction base m70A is a virtual correction tooth part m71A in which each of the virtual artificial teeth m71c is enlarged and corrected including the first contraction tolerance e1 and the virtual correction artificial teeth m71b are integrally arranged. can be reset to include In addition, the virtual correction base m70A preferably includes a virtual correction buried hole m72A in which the virtual buried hole m72 is enlarged and corrected including the second shrinkage tolerance e2. In this case, the virtual correction buried hole m72A may be set in the virtual correction tooth part m71A based on the virtual buried hole m72 . Through this, the virtual correction base m70A may be reset to include the virtual correction tooth part m71A and the virtual correction buried hole m72A.

3 to 5 , it is preferable that the three-dimensional surface information of the virtual correction base m70A is transmitted to the manufacturing apparatus so that the preliminary base 70A made of zirconia is actually formed. The preliminary base 70A preferably includes a preliminary artificial tooth part 71A in which a plurality of preliminary artificial teeth 71b are integrally connected to the dental arch line. At this time, it is preferable that a preliminary buried hole 72A corresponding to the virtual correction buried hole m72A is formed through the preliminary artificial tooth part 71A.

Here, the preliminary base 70A is preferably formed by CNC machining the zirconia block corresponding to the three-dimensional surface information of the virtual correction base m70A. That is, the preliminary base 70A may be manufactured by milling the zirconi block with a milling machine dedicated to the dental restoration so as to correspond to the virtual correction base m70A designed through the planning unit. At this time, it is preferable to understand that the zirconia block is manufactured in a block type by injecting a mixture of zirconia-based material containing zirconia powder into a compression molding mold and applying a constant pressure.

Then, the preliminary base 70A is fired at a preset temperature. At this time, the preliminary base 70A is contracted to a volume corresponding to the virtual prosthetic base m70, and through this, the prosthetic base 70 in which the preliminary base 70A is contracted is preferably manufactured as a real product.

Here, the preliminary base 70A is processed and manufactured into a volume corresponding to the virtual correction base m70A which is enlarged and reset with respect to the three-dimensional surface information of the virtual prosthetic base m70. That is, an error in which the zirconia block is contracted during CNC machining and plasticizing may be already taken into account in the design process of the digital prosthesis. Through this, the size/volume of the finally formed prosthetic base 70 may be set to substantially correspond to the size/volume of the virtual prosthetic base m70 even if the molded product shrinks during the firing process.

On the other hand, the prosthetic base (70 in FIG. 6 ) is formed by shrinking the preliminary base 70A by primary firing at a temperature range of 1,450 to 1,550° C. for 12 to 18 hours. That is, moisture and volatile components contained in the preliminary base 70A are volatilized during the firing process, and each powder may be contracted. Accordingly, the prosthetic base 70 in FIG. 6 may be naturally formed to have a size/volume corresponding to the size/volume of the virtual prosthetic base m70 through the firing process. In addition, as the prosthetic base ( 70 in FIG. 6 ) is formed to have a strength capable of stably supporting the masticatory pressure through the firing process, durability may be remarkably improved. Through this, since fracture and breakage of the final digital prosthesis (80 in FIG. 6) are minimized, the service life can be significantly improved.

At this time, it is preferable that the preliminary base 70A is manufactured by integrally including the deformation preventing support unit 75 . At this time, the anti-deformation support unit 75 is a part included to support the gap between the posterior ends of the prosthetic base (70 in FIG. 6 ), and is preferably set and manufactured through the following series of steps. Here, the fact that the anti-deformation support part 75 supports the prosthetic base (70 in FIG. 6) means that the preliminary base 70A is substantially contracted to the prosthetic base (70 in FIG. 6) during the plasticizing process. In the process, it is preferable to understand that the gap between both ends of the posterior teeth of the preliminary artificial tooth portion 71A is supported.

In detail, it is preferable that the outer one side of the virtual deformation prevention support unit, which is the design information of the deformation prevention support unit 75 , is set to face any one of the inner and outer sides of the dental arch line of the virtual correction base m70A. Furthermore, it is preferable that an outer side of the virtual deformation prevention support part is set to face the inner surface of the dental arch line of the virtual correction base m70A. Here, it is preferable to understand that the inner surface of the dental arch line of the virtual correction base m70A is the inner surface corresponding to the lingual side of the virtual correction base m70A.

In this case, it is preferable that a plurality of virtual support ribs are formed to be spaced apart from each other along the boundary between the virtual correction base m70A and the virtual deformation prevention support unit. That is, it is preferable that the outer side of the virtual deformation prevention support unit is set to face the inner surface of the virtual correction base m70A and spaced apart from each other by a predetermined interval.

In addition, the virtual support ribs are preferably set to connect the opposite inner and outer surfaces of the virtual correction base m70A spaced apart from each other and the virtual deformation prevention support unit. In this case, the virtual support ribs are preferably formed to be spaced apart along the arch line, and may be set to orthogonally connect the virtual correction base m70A and the opposite inner and outer surfaces of the virtual deformation prevention support part, respectively.

That is, the inner surface of the dental arch line of the virtual correction base m70A and the extension direction of the virtual support rib may be substantially orthogonal to each other. In addition, the extension direction of the virtual support rib may be set to be substantially perpendicular to an outer surface of one side of the virtual deformation prevention support part. Through this, the manufactured preliminary base 70A and the deformation-preventing support part 75 are integrally formed, thereby preventing the support rib 76 from being deformed or damaged in advance due to shrinkage during the firing process.

And, when the three-dimensional surface information of the virtual correction base m70A including the virtual deformation prevention support unit is transmitted to the manufacturing apparatus, the preliminary base 70A in which the deformation prevention support unit 75 is integrally formed is manufactured. can be Through this, it is possible to prevent in advance that the gap between the both ends of the posterior side of the preliminary base 70A is excessively narrowed compared to the previously established design information due to excessive contraction of the preliminary base 70A during the firing process. Accordingly, the distance between the both ends of the posterior teeth of the prosthetic base 70, which is formed by separating the deformation-resistant support unit 75 from the preliminary base 70A, can be accurately formed in response to predetermined design information. Through this, the prosthetic base 70 can be precisely manufactured according to the dental arch line of the restoration target arch.

Furthermore, the deformation-resistant support part 75 has a solid body inside between the outer one side facing the inner surface of the dental arch line of the preliminary base 70A and the other outer side connecting both ends of the molar side of the outer side. This is preferable. Accordingly, it is possible to prevent excessive contraction of the deformation preventing support unit 75 when the preliminary base 70A is plasticized. In addition, the overall shape of the prosthetic base 70 may be firmly supported without twisting or deformation through the deformation preventing support unit 75 .

At this time, a cooling groove portion 75a may be formed in the deformation-preventing support portion 75 . In detail, the cooling groove portion 75a may be recessed in a groove shape extending along the outer inner side of the deformation prevention support portion 75 . Accordingly, since heat is discharged through the cooling groove portion 75a and cooling is performed quickly, the shrinkage deformation of the deformation prevention support portion 75 itself can be minimized. Through this, since the prosthetic base 70 is precisely supported and formed in correspondence with the dental arch line, the accuracy of the final digital prosthesis (80 in FIG. 6 ) can be significantly improved.

On the other hand, when the preliminary base 70A is subjected to a plasticizing process, the deformation preventing support unit 75 is separated and removed. In addition, the preliminary base 70A from which the deformation prevention support part 75 is separated and removed may be formed as the prosthetic base (70 in FIG. 6 ) in which a plurality of artificial teeth 71b are integrally arranged along the dental arch line. can At this time, the anti-deformation support part 75 is supported through the support ribs 76 which are branched and formed in plurality along one side of the outer periphery, and the support ribs 76 are formed in a thin bridge shape. Accordingly, the prosthetic base (70 in FIG. 6 ) and the deformation preventing support unit 75 can be connected with a minimum contact area. Through this, the anti-deformation support part 75 can be easily separated and removed from the prosthetic base (70 in FIG. 6 ), and the surface treatment area after removal is minimized, so that manufacturing convenience and speed can be significantly improved.

6 is an exemplary view illustrating a fixing process of a support cylinder in a digital prosthesis manufacturing method according to an embodiment of the present invention, and FIG. 7 is a confirmation process of the final digital prosthesis in the digital prosthetic manufacturing method according to an embodiment of the present invention. It is an example diagram shown.

6 to 7 , a buried hole 72 is formed in the prosthetic base 70 based on the virtual buried hole (m72 in FIG. 3 ). Then, the support cylinder 77 is inserted into the buried hole 72 . At this time, it is preferable that the support cylinder 77 is attached and fixed in the embedding hole 72 through the adhesive r, so that the final digital prosthesis 80 is manufactured. Here, occlusal check guides 2B and 3B for aligning the support cylinder 77 at the correct position in the buried hole 72 and confirming the vertical height (VD in FIG. 2 ) of the prosthetic base 70 are further provided. It is preferable to be provided. These occlusal check guides (2B, 3B) are preferably set and manufactured including the following series of steps.

In detail, based on the planning image (M in FIG. 2), each impression model of the upper and lower jaws in consideration of the vertical height (VD in FIG. 2) is designed. At this time, it is preferable that the impression model includes a target-side impression model (2A) and an opposing-side impression model (3A). And, it is preferable that the occlusal check guides (2B, 3B) are further set and designed in the target-side impression model (2A) and the opposing-side impression model (3A). Here, the target-side impression model (2A) and the opposing-side impression model (3A) are three-dimensional surface information of the restoration target arch (m2 in FIG. 2) and three-dimensional surface information of the opposing arch (m3 in FIG. 2) It is preferable to understand that it is manufactured by three-dimensional printing. Moreover, it is preferable that the design information of the temporary implantation hole (2c) is further set in the position corresponding to the implantation information (B in FIG. 2) in the target-side impression model (2A).

At this time, the design information of the occlusal check guides 2B and 3B is the three-dimensional surface information (m2 in FIG. 2) of the restoration target arch spaced apart corresponding to the vertical height (VD in FIG. 2) and 3 of the opposing arch It can be set to connect between dimensional surface information (m3 in FIG. 2). Accordingly, the target-side impression model (2A) and the opposing-side impression model (3A), respectively, the target-side occlusal check guide (2B) and the opposing-side occlusal check guide (3B) can be integrally formed.

And, it is preferable that each of the impression models including the occlusal check guides (2B, 3B) is three-dimensionally printed and manufactured as a real thing. Through this, the target-side impression model (2A) can be manufactured including the target-side occlusal check guide (2B) and the temporary placement hole (2c). And, the occlusion-side impression model (3A) may be manufactured including the occlusal occlusal check guide (3B). At this time, when the target-side occlusal check guide (2B) and the opposing-side occlusal check guide (3B) are assembled with each other, the target-side impression model (2A) and the opposing-side impression model (3A) are the vertical height (Fig. 2). VD) may be disposed.

On the other hand, it is preferable that the analog (2d) is coupled to the temporary installation hole (2c) formed in the target side impression model (2A). Then, the upper end of the analog 2d is inserted into the coupling groove 78 formed at the lower end of the support cylinder 77, and the analog 2d and the support cylinder 77 are coupled through the coupling screw 74. This is preferable.

In detail, it is preferable that the analog 2d is inserted into the temporary installation hole 2c, and the lower end of the analog 2d is caught and fixed in the temporary installation hole 2c. Through this, rotation and vertical deviation of the analog 2d within the temporary installation hole 2c can be prevented. In addition, the upper end of the analog 2d is preferably formed in substantially the same shape as the post of the abutment. Accordingly, the coupling relationship between the support cylinder 77 and the abutment may be confirmed in advance through the coupling between the support cylinder 77 and the analog 2d.

And, the prosthetic base 70 is pre-installed on the target-side impression model (2A). At this time, it is preferable that the installation position of the prosthetic base 70 is aligned so that the support cylinder 77 is inserted into the buried hole 72 of the prosthetic base 70 . That is, each of the buried holes 72 formed through the prosthetic base 70 are aligned to face the upper side of each of the support cylinders 77 coupled to the target-side impression model 2A. In addition, the prosthetic base 70 may be pre-installed in the target-side impression model 2A so that each of the support cylinders 77 is inserted into each of the embedding holes 72 .

Then, the space between the support cylinder 77 and the buried hole 72 is preferably filled with the adhesive (r). Here, the adhesive (r) is preferably a material that is firmly fixed after curing while having a predetermined viscosity before curing.

At this time, it is preferable that the opposing side impression model (3A) is assembled through the occlusal check guides (2B, 3B) to the target side impression model (2A) before the adhesive (r) is completely cured. Therefore, the position of the prosthetic base 70 may be moved to match the occlusal impression model 3A and the occlusal impression model 3A while the occlusal impression model 3A and the prosthetic base 70 are occluded. In addition, as the prosthetic base 70 is moved, the position of the support cylinder 77 in the buried hole 72 may be adjusted. Through this, it can be confirmed so that the prosthetic base 70 can be fixed in an accurate position when installed in the oral cavity.

8 is an exemplary view illustrating a process of forming a chromophoric layer in a method for manufacturing a digital prosthesis according to an embodiment of the present invention. 9 is a flowchart of a method for forming a color development layer according to an embodiment of the present invention. And, FIG. 10 is a flowchart of a modified example of the method for forming a color development layer according to an embodiment of the present invention.

8 to 9 , the method for forming a color development layer according to an embodiment of the present invention includes a primary firing treatment 3031 , a color development layer lamination application 3032 , a secondary firing treatment 3033 , and embedding the support cylinder. It preferably includes a series of steps such as fixing 3034 . That is, it is more preferable that the process of forming the color developing layer is performed before fixing the support cylinder ( 77 in FIG. 6 ) to the prosthetic base 70 .

In detail, it is preferable to understand that the primary firing treatment 3031 is a step in which the prosthetic base 70 is formed by firing the preliminary base ( 70A in FIG. 5 ) as described above.

In addition, it is preferable that a color developing layer 81 matching the color of the restoration target arch is formed on the surface of the plasticized prosthetic base 70 . In detail, it is preferable that a coating composition having a predetermined viscosity is laminated and applied to a predetermined thickness on the surface of the prosthetic base 70 formed by the firing process.

In this case, it is preferable that the coating composition includes a base powder of the same material as the prosthetic base 70 and a powder formulation containing a pigment corresponding to the target arch that is set to be expressed in a color corresponding to the arch to be restored. For example, the base powder may include one selected from ceramic powder, porcelain powder, zirconia powder, and mixtures thereof and a metal oxide, silicon dioxide, aluminum oxide, zinc peroxide, sodium oxide, potassium oxide, zirconium oxide, calcium oxide , may be included in one selected from phosphoric anhydride and mixtures thereof.

And, it is preferable that the powder formulation and the solvent are mixed to form the coating composition. Here, the solvent may be provided with any one selected from water, glycerin, butanol, pentanol, and mixtures thereof. In addition, additives for viscosity or curing may be further included.

In addition, it is preferable that the coating composition is prepared in plurality by setting different colors and mixing ratios of the target arch-corresponding pigment. For example, the target arch-corresponding pigment may be provided with color pigments such as white, yellow, red, blue, and green, and the mixing ratio may be adjusted to be similar to the actual color of the restoration target arch.

In addition, it is preferable that the

coating layers

81a, 81b, and 81c are formed on the surface of the prosthetic base 70 by applying a multi-layered coating composition for each color. Here, it is preferable that the multi-layered overall thickness of the application layers 81a, 81b, and 81c is thicker than the thickness of the color development layer 81 formed on the final digital prosthesis 80 .

That is, it is preferable that the application layers 81a, 81b, and 81c also take into account a shrinkage error corresponding to the volume contracted in the secondary firing process to be described later. Accordingly, the thickness of the chromogenic layer 81 integrally attached to the prosthetic base 70 after the secondary firing process may be formed to have a thickness corresponding to the design information of the digital prosthesis set during the tooth restoration plan.

Next, the prosthetic base 70 on which the application layers 81a, 81b, and 81c are multi-layered is preferably subjected to secondary firing. In this case, the secondary firing treatment is preferably performed in a manner in which the process of baking for 10 to 30 minutes at a temperature range of 740 to 760° C. is repeated three times. And, when the secondary firing process is completed, the color development layer 81 matching the color of the restoration target arch may be formed on the surface of the prosthetic base 70 .

On the other hand, it is preferable that the secondary firing process is completed and the support cylinder 77 is embedded and fixed in the prosthetic base 70 to which the color developing layer 81 is attached, so that the digital prosthesis is finally manufactured. In this case, if the support cylinder 77 is first fixed to the prosthetic base 70 and then subjected to secondary firing, deformation or volatilization of the adhesive used to fix the support cylinder 77 may occur. Therefore, it is preferable that the support cylinder 77 is fixed to the prosthetic base 70 after the secondary firing process for fixing the color development layer 81 .

The coating composition includes a material substantially the same as that of the zirconia block used for manufacturing the prosthetic base 70 . Accordingly, the color development layer 81 can be firmly fixed to the prosthetic base 70 through a high degree of adhesion between the same materials and a firing process. Through this, it is possible to prevent in advance that the color development layer 81 is separated from the prosthetic base 70 . Furthermore, since the color-developing layer 81 itself is formed of a zirconia material, a problem in which the color-developing layer 81 is partially broken or peeled when hard food is ingested can be prevented.

And, as the application layers 81a, 81b, and 81c are multi-layered and fired, a gradation color can be developed with a color similar to that of the actual gum tissue. Accordingly, the aesthetics of the final digital prosthesis on which the color developing layer 81 is formed can be significantly improved. Furthermore, since the color development layer 81 is naturally formed with a subtle luster through the firing process, a high-quality prosthesis with improved external aesthetics through color and luster can be provided. Through this, even if the digital prosthesis 80 is exposed by opening the mouth while the digital prosthesis is fixed in the oral cavity of the patient, excessive foreignness with the gum tissue is minimized, so that the satisfaction with use can be significantly improved.

Moreover, after the color development layer 81 is applied, in the secondary firing process, the process of firing at a lower temperature and for a shorter time than the primary firing process is repeated 2-3 times. Therefore, while preventing the secondary shrinkage of the already-fired prosthetic base 70, the multi-coating of the color-developing layer 81 to a predetermined thickness can be firmly attached and cured to the prosthetic base 70, thereby improving durability. can be significantly improved.

Alternatively, referring to FIG. 10 , the present invention may include a series of steps such as a firing process 2031 , the color development layer lamination application 2032 , and the embedding and fixing of the support cylinder 2033 . In this case, the color development layer may include a primer layer, a color development layer, and a coating layer.

In detail, the primer layer is provided in a liquid or colloidal state containing an acrylic resin material and zirconium oxide, and may be laminated and applied 1 to 3 times on the outer surface of the lower end of the prosthetic base.

In addition, the color expression layer may include a base resin, a pigment corresponding to the target arch, and a dispersant, and a photoinitiator may be further included so that photocuring is performed in a preset optical region (eg, ultraviolet region).

In addition, the coating layer is preferably applied to reinforce the surface of the color development layer, and may be formed using a varnish containing an acrylic synthetic resin such as Optiglaze of GC or a coating agent commonly used in the manufacture of dental restorations. This coating layer not only improves aesthetic satisfaction by imparting gloss to the color developing layer, but also prevents denaturation caused by abrasion, scratching, peeling, breakage, cleaning solution, etc. can be

As described above, the present invention is not limited to each of the above-described embodiments, and variations can be implemented by those of ordinary skill in the art to which the present invention pertains without departing from the scope of the claims of the present invention. and such modifications are within the scope of the present invention.

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

Claims

a first step of generating a planning image in which surface information and alveolar bone information of the restoration target arch and the opposing arch are displayed as a three-dimensional image aligned in correspondence to a preset vertical height;

Three-dimensional surface information of a virtual prosthetic base in which virtual artificial tooth parts matching the occlusal matching with the surface information of the opposing arch are arranged on the outer surface side along the dental arch line of the alveolar bone information, and the inner part is set based on the surface information of the target arch a second step of resetting the three-dimensional surface information of the virtual prosthetic base to the three-dimensional surface information of the virtual correction base enlarged to the outside including a preset first shrinkage tolerance;

The three-dimensional surface information of the virtual correction base is transmitted to a manufacturing device, so that a preliminary base made of zirconia is formed as a real thing, and the preliminary base is plasticized at a preset temperature and contracted to a volume corresponding to the virtual prosthetic base. A third step in which is produced; and

and a fourth step of manufacturing a final digital prosthesis through the prosthetic base.
The method of claim 1,

The second step includes the steps of setting a plurality of implant placement information to be spaced apart along the arch line, and setting a virtual buried hole at a position corresponding to the placement information in the three-dimensional surface information of the virtual prosthetic base. includes,

and the fourth step includes inserting a support cylinder into the buried hole formed in the prosthetic base based on the virtual buried hole and attaching and fixing the support cylinder through an adhesive.
3. The method of claim 2,

The second step includes a step in which a center line of the virtual buried hole having a cylindrical shape exceeding the cross-sectional area of the support cylinder is virtually arranged to match the implantation information, and the virtual buried hole includes a preset second shrinkage tolerance Comprising the step of calibrating enlarged outward,

and the first shrinkage tolerance and the second shrinkage tolerance are enlarged and set at a volume ratio of 10 to 20% with respect to the volume of the virtual prosthetic base and the virtual buried hole before correction.
3. The method of claim 2,

The second step includes setting an outer side of the virtual deformation-resistant support unit to face any one of the inner and outer surfaces of the dental arch line of the virtual correction base, along the boundary between the virtual correction base and the virtual deformation-resistant support unit. Including the step of forming a plurality of virtual support ribs spaced apart,

and the third step includes manufacturing the physical anti-distortion support unit to be integrally formed on the preliminary base based on the virtual anti-deformation support unit.
5. The method of claim 4,

In the third step, the deformation prevention supporter unit

A support rib formed on the basis of the virtual support rib is formed with a solid body inside the outer one side facing any one of the inner and outer side surfaces of the dental arch line of the prosthetic base and the other outer side connecting both ends of the outer one side. Doedoe formed integrally with the prosthetic base through

The digital prosthesis manufacturing method, characterized in that after the preliminary base is plasticized, the deformation preventing support part is separated and removed from the prosthetic base.
3. The method of claim 2,

The first step is

Further comprising the step of designing and manufacturing an occlusal check guide included in each impression model of the upper and lower jaws in consideration of the vertical height based on the planning image,

The fourth step is

An analog is coupled to a temporary implantation hole formed at a position corresponding to the implantation information in the target-side impression model, and the support cylinder is coupled to the analog;

pre-installing the prosthetic base in the target-side impression model so that the support cylinder is inserted into the embedding hole formed in the prosthetic base, and filling a space between the support cylinder and the embedding hole with an adhesive;

and assembling the impression model of the opposing side to the impression model of the target side through the occlusal check guide to confirm the vertical height of the prosthetic base.
The method of claim 1,

The fourth step is

A coloring layer that includes a color pigment corresponding to the color of the restoration target arch and is formed to have a predetermined viscosity or higher is laminated, applied and fixed to a predetermined thickness on the surface of the prosthetic base to match the color of the target arch Digital prosthesis manufacturing method, characterized in that it further comprises the step of forming.
8. The method of claim 7,

The fourth step is

preparing the coating composition by mixing a solvent and a powder formulation containing a base powder of the same material as the prosthetic base and a color corresponding to the target arch to be expressed in a color corresponding to the target arch to be restored;

Laminating and molding the coating composition to a predetermined thickness so as to form a continuous contour matching the surface of the restoration target arch on the root-side surface of the prosthetic base;

and wherein the prosthetic base on which the paint composition is laminated is subjected to a secondary firing process to laminate and fix the color developing layer.
9. The method of claim 8,

In the third step, the prosthetic base is subjected to primary firing at a temperature range of 1,450 to 1,550 ° C for 12 to 18 hours,

In the fourth step, the prosthetic base on which the paint composition is laminated is baked three times for 10 to 30 minutes at a temperature range of 740 to 760° C. and subjected to secondary firing.
8. The method of claim 7,

The fourth step is

Laminating and molding the coating composition further comprising a synthetic resin binder and a photocuring agent on the surface of the prosthetic base subjected to the primary firing treatment to a predetermined thickness to form a continuous contour matching the surface of the restoration target arch; ,

and curing the paint composition laminated on the surface of the prosthetic base through curing light irradiated through a photocuring machine and fixing the coating composition to the color developing layer.