KR102500318B1 - manufacturing method for digital prosthesis - Google Patents

Abstract

In order to improve precision and aesthetics, the present invention creates a planning image in which the surface information and alveolar bone information of the dental arch to be restored and the opposing dental arch are displayed as a three-dimensional image in which the alveolar bone information is aligned corresponding to the preset vertical height, and the implant placement information is displayed as above. A first step of setting a plurality of pieces spaced apart along the dental arch line of the alveolar bone information; A virtual artificial tooth portion whose outer surface side is matched with the surface information of the opposing arch is virtually arranged along the dental arch line, and the inner surface is set based on the surface information of the arch to be restored and is virtually embedded in a position corresponding to the implantation information. The 3D surface information of the virtual prosthetic base with holes set is set, and the 3D surface information of the virtual prosthetic base is reset to the 3D surface information of the virtual correction base expanded outward including the preset first shrinkage tolerance. Step 2; The three-dimensional surface information of the virtual correction base is transmitted to a manufacturing device to form a real preliminary base made of zirconia, and the preliminary base is fired at a preset temperature to shrink the prosthetic base 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 by inserting a support cylinder into an embedding hole formed in the prosthetic base based on the virtual embedding hole and attaching and fixing the support cylinder through an adhesive.

Description

Digital prosthesis manufacturing method {manufacturing method for digital prosthesis}

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 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 portion in which a plurality of artificial teeth replacing lost natural teeth are arranged or connected in a row corresponding to the arch shape of the gum to be restored, and the lower end of the artificial tooth portion is connected integrally with the artificial tooth portion. It may further include an artificial gum portion that surrounds and connects. At this time, a plurality of implants may be spaced apart from each other along the arch of the gum to be restored, and a coupling portion corresponding to the implant placement position may be formed in the prosthesis.

Here, the conventional prosthesis has a structure in which the coupling part is integrally formed in the form of a coupling groove on the inner surface supported by the gum to be restored, or a structure in which the coupling portion is formed in the form of a buried hole and a support cylinder is embedded and fixed in the buried hole. can be distinguished by

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

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

And, in the case of the latter, it is mainly manufactured by 3D printing using oligomer acrylic synthetic resin as a material, but has the advantage of quick manufacturing time and easy manufacturing method, but has a relatively weak strength.

Korean Patent Registration No. 10-0403834

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

In order to solve the above problems, the present invention generates a planning image displayed as a three-dimensional image in which the surface information and alveolar bone information of the dental arch to be restored and the opposing dental arch are aligned corresponding to a preset vertical height, and the implant placement information is A first step of setting a plurality of pieces spaced apart along the dental arch line of the alveolar bone information; A virtual artificial tooth portion whose outer surface side is matched with the surface information of the opposing arch is virtually arranged along the dental arch line, and the inner surface is set based on the surface information of the arch to be restored and is virtually embedded in a position corresponding to the implantation information. The 3D surface information of the virtual prosthetic base with holes set is set, and the 3D surface information of the virtual prosthetic base is reset to the 3D surface information of the virtual correction base expanded outward including the preset first shrinkage tolerance. Step 2; The three-dimensional surface information of the virtual correction base is transmitted to a manufacturing device to form a real preliminary base made of zirconia, and the preliminary base is fired at a preset temperature to shrink the prosthetic base 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 by inserting a support cylinder into an embedding hole formed in the prosthetic base based on the virtual embedding hole and attaching and fixing the support cylinder through an adhesive.

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

First, the design information of the prosthesis is expanded by the preset contraction ratio by considering the contraction error that occurs when the zirconia block, which is a material for restorative teeth with durability that can stably support the chewing pressure, contracts during plastic processing in the prosthetic design process. According to the correction settings, when the finally manufactured digital prosthesis is installed in the oral cavity, the accuracy of occlusion with the antagonist can be remarkably improved.

Second, as the dental arch line extending from the anterior side of the prosthetic base to both posterior teeth is restrained and supported through the anti-deformation support portion connected along the side thereof, excessive constriction contraction or twisting deformation in the horizontal direction during plastic processing is prevented and contracted. Even in this state, the position of the preformed buried hole is precisely matched with the implant/abutment placed in the oral cavity, so the installation precision can be remarkably improved.

Third, as the support ribs connecting the gap between the inner and outer surfaces facing the prosthetic base and the anti-deformation support part are radially formed to connect the inner and outer surfaces, the support ribs in the form of thin bridges more stably support contraction or deformation. By simply cutting, the deformation preventing support portion can be easily separated, and thus the convenience of operation can be remarkably improved.

1 is a flowchart of a method for manufacturing a digital prosthesis according to an embodiment of the present invention.
2 is an exemplary view showing a planning image in the digital prosthetic manufacturing method according to the present invention.
3 is an exemplary view showing a virtual prosthetic base and a virtual correction base in the digital prosthetic manufacturing method according to an embodiment of the present invention;
4A and 4B are exemplary diagrams comparing volume ratios of a virtual prosthesis base and a virtual correction base in a digital prosthesis manufacturing method according to an embodiment of the present invention.
5 is an exemplary view showing a preliminary base in the method for manufacturing a digital prosthesis according to an embodiment of the present invention.
6 is an exemplary diagram illustrating a process of fixing a support cylinder in a 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 diagram illustrating a process of forming a color layer in a method for manufacturing a digital prosthesis according to an embodiment of the present invention.

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

As shown in FIGS. 1 and 2, the digital prosthetic manufacturing method according to the present invention generates a planning image and sets implantation information (1011), sets a virtual prosthetic base and resets the virtual prosthetic base to a virtual correction base (1012), It includes a series of steps such as prosthetic base manufacturing 1013 and final digital prosthesis manufacturing 1014 .

On the other hand, it is preferable to understand the dental arch to be restored, which will be described below, as a jaw that requires dental restoration through the digital prosthesis, and the opposing arch to be understood as a jaw that occludes with the dental arch to be restored. At this time, in the present invention, the restoration target arch is the lower jaw, which is an edentulous jaw, and the opposing arch is described and illustrated as the upper jaw, which is a dentulous jaw. Of course, in some cases, the present invention can be equally applied to the manufacturing process of a digital prosthesis installed when both the upper and lower jaws are edentulous.

Preferably, the digital prosthesis manufacturing method is performed through a digital prosthetic manufacturing system including an imaging device, a planning unit, and a manufacturing device.

At this time, the imaging device is for acquiring 3-dimensional surface information (m2, m3) and alveolar bone information (A) for the arch to be restored and the opposing arch, and is understood as a concept encompassing an intraoral scanner and a CT imaging device desirable. In detail, surface information on the outer surface of the gum portion of the arch to be restored and the opposing arch is obtained as a three-dimensional image by using the intraoral scanner. Then, the alveolar bone information (A) capable of confirming the shape, curvature, and density of the alveolar bone and the location of the lower alveolar nerve is acquired 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 previously stored in the planning unit. That is, the 3D surface information (m2, m3) and the alveolar bone information (A) of the dental arch to be restored and the opposing dental arch acquired through the imaging device are loaded into the planning unit and displayed as a 3D image. In addition, the planning image for designing the digital prosthesis ( M) can be created. In addition, it is preferable that the implant placement information (B) of the implant in the planning image (M) is spaced apart from each other along the dental arch line of the alveolar bone and aligned in plurality. Here, the dental arch line is preferably understood as a shape in which a virtual line or a virtual line connecting positions where teeth are actually arranged extends in an arc shape. In addition, in the present invention, it is preferable to understand that the implant is a fixture.

It is preferable to understand that the manufacturing device is a device that manufactures an actual 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 showing 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 virtual prostheses in a digital prosthesis manufacturing method according to an embodiment of the present invention. It is an exemplary view comparing the volume ratio of the base and the virtual correction base. At this time, it is preferable to understand that the one-dot chain line in FIGS. 3 to 4B is the virtual prosthetic base m70 and the solid line is the virtual correction base m70A.

Referring to FIGS. 2 to 4B , it is preferable that the 3D surface information of the virtual prosthetic base m70 is set in the planning image M. At this time, the virtual prosthetic base m70 has a virtual artificial tooth part m71 whose outer surface part m701 occlusion matches with the three-dimensional surface information m3 of the opposing arch, and is virtually arranged along the dental arch line. Also, it is preferable that the inner surface m702 of the virtual prosthetic base m70 is set based on the 3D surface information m2 of the arch to be restored. For example, the inner surface m702 of the virtual prosthetic base m70 has the 3D surface information m2 of the dental arch to be restored and a predetermined value so that the lower end of the support cylinder protrudes and can be combined with the abutment described later. It can be set at intervals. Alternatively, the inner surface m702 of the virtual prosthetic base m70 may be set to match the 3D surface information m2 of the arch to be restored.

It is preferable that the three-dimensional surface information of the virtual prosthetic base m70 is set in such a way that a plurality of virtual artificial teeth m71c individually matched to each tooth position corresponding to the actual tooth shape are arranged in correspondence with 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 placement information (B) is overlapped with the three-dimensional surface information of the virtual artificial tooth part (m71). And, it is preferable that a virtual buried hole m72 is set at a position corresponding to the implantation information (B). At this time, it is preferable to understand that the virtual buried hole m72 is three-dimensional design information of a buried hole, which is a part where the support cylinder is buried and fixed, which will be described later. Here, it is preferable to understand that the support cylinder is a part that is fixed to a prosthetic base to be described later and combined with an abutment fastened to an upper end of the implant so that the finally manufactured digital prosthesis is fixed to the oral cavity.

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

At this time, 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 of the lower end. In addition, it is preferable that the center line of the virtual buried hole m72 is matched with the implantation information B to be virtually arranged. As such, the virtual buried hole m72 is set to have an inner diameter that exceeds the outer diameter of the support cylinder, and through this, the virtual buried hole m72 is a gap filled with an adhesive for attaching and fixing the support cylinder to the prosthetic base. This can be considered and set.

Meanwhile, it is preferable that the 3D surface information of the virtual prosthetic base m70 is reset to the 3D 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 compensated 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 enlarged at a volume ratio of 10 to 20% with respect to the volume of the virtual prosthetic base m70. Further, the second shrinkage tolerance e2 is preferably set such that the volume of the virtual compensation buried hole m72A is increased at a volume ratio of 10 to 20% with respect to the volume of the virtual buried hole m72. At this time, it is understood that the second shrinkage tolerance e2 has the same meaning as when the inner diameter of the virtual corrected buried hole m72A is enlarged at a length ratio of 10 to 20% with respect to the inner diameter of the virtual buried hole m72. desirable.

In detail, when the 3D surface information of the virtual prosthetic base m70 is set, it is preferable that the set 3D image is virtually enlarged including the first shrinkage tolerance e1 in the lateral direction, the longitudinal direction, and the overall outward direction. Therefore, the virtual prosthetic base m70 is reset to the three-dimensional surface information of the virtual correction base m70A in which the overall volume is enlarged while the shape of each virtual artificial tooth m71c and the curvature of the dental arch line correspond to each other. can Here, the positions of the dental arch line and the placement information B may also be reset to a position considering the volume ratio of the enlarged and corrected virtual correction base m70A. That is, as shown in the drawing, if the placement information (B) is overlapped with the lateral incisor and the second premolar on the virtual prosthetic base m70, the placement information ( B) can be set.

Through this, the virtual correction base m70A is a virtual correction tooth portion m71A in which each of the virtual artificial teeth m71c includes the first shrinkage tolerance e1 and the enlarged and corrected virtual artificial teeth m71b are integrally arranged. It can be reset to include. Also, a virtual correction filling hole m72A may be set in the virtual correction tooth portion m71A based on the virtual filling hole m72. At this time, the virtual correction filling hole m72A is enlarged and corrected including the second shrinkage tolerance e2, and through this, the virtual correction tooth portion m71A and the virtual correction filling hole m72A are included. The calibration base m70A can be reset.

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

Referring to FIGS. 3 to 5 , it is preferable that the three-dimensional surface information of the virtual calibration 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 portion 71A in which a plurality of artificial preliminary teeth 71b are integrally connected to correspond to the dental arch line. At this time, it is preferable that a preliminary implantation hole 72A corresponding to the virtual correction implantation 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 calibration base m70A. That is, the preliminary base 70A corresponding to the virtual correction base m70A designed through the planning unit may be manufactured by milling the zirconia block with a milling machine dedicated to dental restoration. At this time, 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.

Further, it is preferable that the preliminary base 70A is fired at a predetermined temperature to produce a real prosthetic base 70 contracted to a volume corresponding to the virtual prosthetic base m70.

Here, the preliminary base 70A is processed and manufactured into a volume corresponding to the enlarged and reset virtual preliminary base 70A with respect to the 3D surface information of the virtual prosthetic base m70. That is, an error caused by contraction of the zirconia block during CNC machining and firing may be already taken into consideration during the design process of the digital prosthesis and manufactured. Through this, even if shrinkage of the molded article occurs during the firing process, 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.

Meanwhile, the prosthetic base (70 in FIG. 6) is formed by shrinking the preliminary base 70A by performing a primary firing process at a temperature range of 1,450 to 1,550° C. for 12 to 18 hours. That is, moisture and volatile components included in the preliminary base 70A are volatilized and each powder is contracted to form the prosthetic base (70 in FIG. 6). Therefore, the prosthetic base (70 in FIG. 6) can be naturally formed in a size 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 with strength capable of stably supporting the chewing pressure through the plastic treatment, durability can be significantly improved. Through this, fracture and breakage of the final digital prosthesis (80 in FIG. 8 ) are minimized, so that the service life can be remarkably improved.

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

In detail, it is preferable that one side of the outer edge of the virtual deformation-preventing support unit, which is design information of the deformation-prevention support unit 75, is set to face any one of the inner and outer surfaces of the dental arch line of the virtual correction base m70A. Furthermore, it is preferable that one outer side of the virtual deformation-preventing support unit 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.

At this time, it is preferable that a plurality of virtual support ribs are spaced apart from each other along the boundary between the virtual correction base m70A and the virtual deformation-preventing support unit. That is, it is preferable that one outer side of the virtual deformation-preventing support unit faces the inner surface of the virtual correction base m70A and is spaced apart from each other at a predetermined interval.

And, it is preferable that the virtual support rib is set to connect the inner and outer surfaces facing each other and the virtual correction base m70A spaced apart from each other. At this time, the virtual support ribs are preferably formed spaced apart along the dental arch line, and may be set to connect the inner and outer surfaces of the virtual correction base m70A and the virtual deformation-preventing support unit facing each other at right angles.

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

In addition, when the three-dimensional surface information of the virtual correction base (m70A) including the virtual deformation prevention support portion is transmitted to the manufacturing device, the deformation prevention support portion 75 is integrally formed with the preliminary base (70A) for manufacturing. It can be. Through this, it is possible to prevent in advance that the preliminary base (70A) is excessively narrowed than the design information established due to the excessive contraction of the gap between both ends of the posterior side in the plastic processing process. Therefore, the distance between both ends of the posterior side of the prosthetic base 70 formed by separating the deformation preventing support part 75 from the preliminary base 70A can be accurately formed corresponding to predetermined design information. Through this, the prosthetic base 70 can be precisely manufactured according to the arch line of the arch to be restored.

Moreover, the deformation preventing support part 75 is formed of a solid body between one side of the outer side facing the inner surface of the dental arch line of the preliminary base 70A and the other side of the outer side connecting both ends of the molar side of the outer side. this is preferable Therefore, during plastic processing, excessive contraction of the anti-deformation support part 75 can be prevented, and through this, the overall shape of the prosthetic base 70 can be firmly supported and formed without twisting or deformation.

At this time, a cooling groove part 75a may be formed in the deformation preventing support part 75 . In detail, the cooling groove portion 75a may be recessed into a shape of a groove extending along the inside of the outer edge of the deformation preventing support portion 75 . Therefore, since hot air is discharged through the cooling groove 75a and cooling is performed quickly, shrinkage of the anti-deformation support part 75 itself can be minimized. Through this, since the prosthetic base 70 is precisely supported and formed corresponding to the dental arch line, the accuracy of the final digital prosthesis 80 can be remarkably improved.

Meanwhile, when the preliminary base 70A is subjected to a firing process, the deformation-preventing support portion 75 is separated and removed, and a plurality of artificial teeth 71b are formed as the prosthetic base 70 integrally arranged along the dental arch line. It can be. At this time, the deformation-preventing support part 75 is supported through the support rib 76 formed by being branched into a plurality of pieces along one side of the outer perimeter. At this time, the support rib 76 is formed in a thin bridge shape. Therefore, the prosthetic base 70 and the deformation preventing support part 75 can be connected with a minimum contact area. Through this, the deformation preventing support portion 75 can be easily separated and removed from the prosthetic base 70, and the surface treatment area after removal is minimized, so that manufacturing convenience and speed can be remarkably improved.

6 is an exemplary diagram showing a process of fixing a support cylinder in a method for manufacturing a digital prosthesis according to an embodiment of the present invention, and FIG. It is an example shown.

Referring to FIGS. 6 and 7 , the support cylinder 77 is inserted into the buried hole 72 formed on the basis of the virtual buried hole (m72 in FIG. 3 ) in the prosthetic base 70 . Further, it is preferable that the final digital prosthesis 80 is manufactured by attaching and fixing the support cylinder 77 through the adhesive r. At this time, the occlusion check guides 2B and 3B for aligning the support cylinder 77 to the correct position in the buried hole 72 and confirming the vertical diameter (VD in FIG. 2) of the prosthetic base 70 are further provided. It is desirable to have It is preferable that these occlusion check guides 2B and 3B are set and manufactured by including the following series of steps.

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

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

In addition, it is preferable that each of the impression models including the occlusion check guides 2B and 3B is 3D printed and manufactured as a real object. Through this, the target-side impression model 2A can be manufactured by including the target-side occlusion check guide 2B and the temporary placement hole 2c. In addition, the opposing-side impression model 3A is manufactured including the opposing-side occlusion check guide 3B, and when the object-side occlusion check guide 2B and the opposing-side occlusion check guide 3B are mutually assembled, the The object-side impression model 2A and the opposing-side impression model 3A may be disposed corresponding to the vertical height (VD in FIG. 2).

Meanwhile, it is preferable that the analog 2d is coupled to the temporary placement hole 2c formed in the target-side impression model 2A. And, it is preferable that 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 coupled through the coupling screw 74.

In detail, it is preferable that the lower end of the analog 2d is inserted into the temporary placement hole 2c and locked so as to prevent rotation and separation in the vertical direction. And, it is preferable that the upper end of the analog 2d is formed in substantially the same shape as the post of the abutment. Therefore, the coupling relationship between the support cylinder 77 and the abutment can be confirmed in advance through the coupling between the support cylinder 77 and the analog 2d.

Then, the prosthetic base 70 is preliminarily 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 . That is, each of the buried holes 72 formed through the prosthetic base 70 is aligned so as 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 preliminarily installed in the target-side impression model 2A so that each of the support cylinders 77 is inserted into each of the buried holes 72 .

Subsequently, it is preferable that the adhesive (r) is filled between the support cylinder 77 and the buried hole 72 . Here, the adhesive (r) is preferably a material that has a predetermined viscosity before curing and is firmly fixed after curing.

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

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

Referring to FIG. 8 , a step of forming a color layer 81 matching the color of the arch to be restored may be further included on the plasticized surface of the prosthetic base 70 . Here, it is preferable that the color-developing layer 81 is formed through the following series of steps, and more preferably, it is performed before fixing the support cylinder (77 in FIG. 7) to the prosthetic base 70.

In detail, it is preferable that a paint composition having a predetermined viscosity is laminated and applied to the surface of the prosthetic base 70 subjected to the firing process to a predetermined thickness. At this time, the coating composition preferably includes a powder formulation including a base powder made of the same material as the prosthetic base 70 and a pigment corresponding to the target arch that is preset to be expressed in a color corresponding to the target 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, and may include silicon dioxide, aluminum oxide, zinc peroxide, sodium oxide, potassium oxide, zirconium oxide, and calcium oxide. , phosphoric acid anhydride, and mixtures thereof.

And, it is preferable that the coating composition is formed by mixing the powder formulation and the solvent. Here, the solvent may be provided with any one selected from water, glycerin, butanol, pentanol, and mixtures thereof, and in addition, an additive for viscosity or hardening may be further included.

At this time, the paint composition is preferably prepared in plurality by setting the color and mixing ratio of the pigment corresponding to the target arch to be different. For example, the target arch-corresponding pigment may include 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 target arch.

Further, it is preferable that coating layers 81a, 81b, and 81c in which a coating composition for each color is applied in multiple layers are formed on the surface of the prosthetic base 70. Here, it is preferable that the total thickness of the coating layers 81a, 81b, and 81c laminated is thicker than the thickness of the color layer 81 formed on the final digital prosthesis 80.

That is, it is preferable that the shrinkage error corresponding to the volume of the applied layers 81a, 81b, and 81c shrinked in the secondary firing process to be described later be considered. Therefore, the thickness of the coloring layer 81 integrally attached to the prosthetic base 70 after the secondary firing process can be formed to a thickness corresponding to the design information of the digital prosthesis 80 set in the dental restoration plan. there is.

Subsequently, the prosthetic base 70 in which the coating layers 81a, 81b, and 81c are multi-layered is preferably subjected to a second firing process. At this time, the secondary firing treatment is preferably carried out in a manner in which a process of baking for 10 to 30 minutes in a temperature range of 740 to 760 ° C. is repeated three times. In addition, when the secondary firing process is completed, the color layer 81 matching the color of the arch to be restored may be formed on the surface of the prosthetic base 70 .

This coating composition includes a material substantially the same as the zirconia block used in manufacturing the prosthetic base 70 . Therefore, the color layer 81 can be firmly fixed to the prosthetic base 70 through a high level of bonding strength between the same materials. Through this, peeling of the coloring layer 81 from the prosthetic base 70 can be prevented in advance. Moreover, since the color layer 81 itself is formed of a zirconia material, problems in which the color layer 81 is partially fractured or peeled off when hard food is consumed can be prevented.

In addition, as the coating layers 81a, 81b, and 81c are multi-layered and fired, a gradation color similar to that of the actual gum tissue can be developed. Accordingly, aesthetics of the final digital prosthesis 80 on which the color layer 81 is formed can be remarkably improved. Furthermore, since the color-developing layer 81 naturally forms a soft gloss through a plastic treatment, a high-quality prosthetic appliance with improved external aesthetics through color and gloss can be provided. Through this, even if the digital prosthesis 80 is exposed by opening the mouth while the digital prosthesis 80 is fixed in the patient's oral cavity, excessive heterogeneity with the gum tissue is minimized, so satisfaction with use can be remarkably improved.

Furthermore, when the second firing treatment is performed after the color layer 81 is applied, the firing treatment process is repeated 2 to 3 times at a lower temperature than the first firing treatment for a short time. Therefore, while preventing secondary shrinkage of the prosthetic base 70 that has already been subjected to firing, the colored layer 81 applied multiple times to a predetermined thickness can be firmly attached to and hardened to the prosthetic base 70, thereby increasing durability. can be significantly improved.

On the other hand, terms such as "comprise", "comprise", "have" or "have" described above mean that the corresponding component may be present unless otherwise stated, It should be construed as being able to further include other components rather than excluding components. All terms, including technical or scientific terms, have the same meaning as commonly understood by a person of ordinary skill in the art to which the present invention belongs, unless defined otherwise. Commonly used terms, such as terms defined in a dictionary, should be interpreted as being consistent with the contextual meaning of the related art, and unless explicitly defined in the present invention, they are not interpreted in an ideal or excessively formal meaning.

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.

M: Planning Image m70: Virtual Prosthetic Base
m70A: virtual orthodontic base 70: prosthetic base
72: buried hole 70A: spare base
75: deformation prevention support part 76: support rib
77: support cylinder 80: digital prosthesis

Claims (5)

A planning image displayed as a three-dimensional image in which the surface information and alveolar bone information of the dental arch to be restored and the opposing dental arch are aligned corresponding to the preset vertical height is generated, and the implant placement information is spaced in plurality along the dental arch line of the alveolar bone information. The first step to be set;
A virtual artificial tooth portion whose outer surface side is matched with the surface information of the opposing arch is virtually arranged along the dental arch line, and the inner surface is set based on the surface information of the arch to be restored and is virtually embedded in a position corresponding to the implantation information. The 3D surface information of the virtual prosthetic base with holes set is set, and the 3D surface information of the virtual prosthetic base is reset to the 3D surface information of the virtual correction base expanded outward including the preset first shrinkage tolerance. Step 2;
The three-dimensional surface information of the virtual correction base is transmitted to a manufacturing device to form a real preliminary base made of zirconia, and the preliminary base is fired at a preset temperature to shrink the prosthetic base 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 by inserting a support cylinder into an embedding hole formed in the prosthetic base based on the virtual embedding hole and attaching and fixing the support cylinder through an adhesive. According to claim 1,
In the second step, the center line of the virtual buried hole having a cylindrical shape exceeding the cross-sectional area of the support cylinder is matched with the implantation information to be virtually arranged, and the virtual buried hole includes a preset second shrinkage tolerance. Including the step of expanding and correcting outwardly,
The digital prosthesis manufacturing method of claim 1 , wherein 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 prosthesis base and the virtual buried hole before correction. According to claim 2,
In the second step, one side of the outer edge is set to face any one of the inner and outer surfaces of the dental arch line of the virtual correction base, but is connected through a virtual support rib formed by being spaced apart in plurality along the boundary with the virtual correction base. Including the step of integrally setting the virtual deformation-preventing support unit,
The third step includes separating and removing the real deformation-preventing support part formed on the basis of the virtual deformation-preventing support part from the prosthetic base after plastic processing,
The deformation-preventing support part is formed of a solid body between one outer side facing one of the inner and outer surfaces of the dental arch line of the prosthetic base and the other outer side connecting both ends of the outer one side to the digital prosthesis manufacturing method. According to claim 2,
The first step is
Further comprising designing and manufacturing an occlusal check guide included in each impression model of the upper and lower jaw in which the vertical height is considered based on the planning image,
In the fourth step,
coupling an analog to a temporary placement hole formed at a position corresponding to the placement information in the target impression model, and coupling the support cylinder to the analog;
pre-installing the prosthetic base on the target-side impression model so that the support cylinder is inserted into the buried hole formed in the prosthetic base, and filling a space between the support cylinder and the buried hole with an adhesive;
and assembling an impression model on the opposite side to the impression model on the target side through the occlusion check guide to confirm the vertical height of the prosthetic base. According to claim 1,
In the third step, the prosthetic base is subjected to a primary firing process at a temperature range of 1,450 to 1,550 ° C for 12 to 18 hours,
A coating composition formed by mixing a solvent and a powder preparation containing a base powder of the same material as the prosthetic base and a pigment corresponding to the arch to be restored, which is preset to be expressed in a color corresponding to the arch to be restored, is applied to the surface of the prosthetic base subjected to a firing process. Steps of layering and coating with a predetermined thickness;
Through a secondary firing process in which the prosthetic base on which the coating composition is laminated is baked three times for 10 to 30 minutes in a temperature range of 740 to 760 ° C, a color layer matching the color of the arch to be restored is formed on the surface of the prosthetic base. A method for manufacturing a digital prosthesis, further comprising a forming step.

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