KR101759118B1 - Method of manufacturing porcelain fused metal using soft metal block - Google Patents

Abstract

The present invention relates to a method of manufacturing a porcelain fused metal (PFM) type metal ceramics tube (crown), and more particularly, to a method of manufacturing a porcelain fused metal The present invention relates to a method of manufacturing a metal ceramics pipe using a soft metal block that can prevent nonconformity due to shrinkage and deformation of a soft metal block during a process of forming a metal coping by sintering after cutting.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a method for manufacturing a metal porcelain tube using a soft metal block,

The present invention relates to a method of manufacturing a porcelain fused metal (PFM) type metal ceramics tube (crown), and more particularly, to a method of manufacturing a porcelain fused metal The present invention relates to a method of manufacturing a metal ceramics pipe using a soft metal block that can prevent nonconformity due to shrinkage and deformation of a soft metal block during a process of forming a metal coping by sintering after cutting.

Generally, when a tooth is damaged due to severe tooth decay or trauma, it is known that a dental treatment is performed by putting a crown (a crown) as a prosthesis in a damaged tooth, or extracting a damaged tooth and then implanting an artificial tooth (an implant) have. It has been widely used for anterior teeth because it has excellent merits such as esthetics, compressive strength and abrasion resistance. However, it is weak in brittleness and weak in tensile and impact, and has problems in use at the posterior part. To overcome these disadvantages, a metal-reinforced metal porcelain tube was introduced into the lower part of Jangseok system.

The metal porcelain tube typically has a metal coping function through the step of floating the teeth of the teeth, forming the external shape of the tooth by wax-up, taking the lead, burial, summoning and casting steps , A porcelain porcelain corresponding to the shape of a patient is formed on the completed metal coping, and then a metal porcelain tube is completed. However, such metal casting cores have a disadvantage that the permanent restoration due to casting defects is weakened, the working time is increased due to casting shrinkage, exposure to hazardous working environment during casting, and manufacturing are somewhat complicated.

In order to solve this problem, a soft metal block made of soft metal such as a cobalt-chromium alloy or a nickel-chromium alloy is used for a metal aided design (CAD / CAM) A method of forming the copings has been proposed. The method using such a soft metal block is a method of forming a metal coping by cutting a soft metal block with a dental CAD cam and then sintering at a predetermined temperature. Since the soft metal block is subjected to sintering only after cutting, Can be minimized and the processing time can be shortened.

However, in the method of manufacturing a metal porcelain tube using a soft metal block according to the related art, shrinkage and deformation of a cut metal work frequently occur in a process of cutting and then softening a soft metal block using a dental CAD cam, Due to the incompatibility of the metalwork after the sintering, that is, when the metal coping is suitable for the abutment (plaster model), the metal copping must be cut again or the metal copping must be made again, which is not only complicated and waste unnecessary material Resulting in an increase in manufacturing cost.

KR 10-2010-0136670 A, Dec. 29, 2010. KR 10-1344253 B1, Dec. 31, 2017. KR 10-1221026 B1, 2013. 01. 04. KR 10-1674074 B1, Nov. 02, 2016.

Korean Dental Hygienist Society J Dent Hyg Sci Vol. "Evaluation of marginal and internal fit of cobalt - chrome sintered metal copings fabricated with dental CAD / CAM system", Journal of the Korean Society of Precision Engineering, Vol.15 No.5, 2015, pp.536-541 Kim Dong Hyeon, Shincheonho, Kim, JH, Kim, JH: Three-dimensional evaluation of gaps associated with fixed dental prostheses fabricated with new technologies. J Prosthet Dent 112: 1432-1436, 2014.

SUMMARY OF THE INVENTION Accordingly, the present invention has been made in order to solve the problems of the prior art, and it is an object of the present invention to provide a soft metal block, which is manufactured by cutting a soft metal block using a dental CAD cam, And it is an object of the present invention to provide a method of manufacturing a metal ceramics pipe using a soft metal block which can prevent nonconformity due to margins of metal coping by optimizing marginal and inner fit of metal copings according to the material.

In accordance with one aspect of the present invention, there is provided a method of manufacturing a dental CAD system, comprising: cutting a soft metal block through a dental CAD / CAM to form a metal coping; Sintering the metal coping at a temperature of 1,250 ° C to 1,400 ° C; Applying the sintered metal coping to the abutment and then applying opac to the surface; Performing a baking step of curing the opaque; Forming a porcelain on top of the cured opacity; And firing the porcelain, wherein forming the metal capping comprises: scanning a patient's mouth to produce an STL file; Designing the metal coping using dental CAD so that the cement space is 0.012 mu m to 0.017 mu m and the additional cement space is 0.030 mu m to 0.040 mu m; And applying the designed STL file to the dental CAM equipment, attaching the soft metal block to the dental CAM equipment, and cutting the soft metal block to form the metal coping. The present invention also provides a method for manufacturing a metal porcelain tube using the flexible metal block.

Preferably, the step of designing the metal coping is to design the metal coping such that the margin between the cement space and the abutment is spaced from the bottom of the abutment in the upper direction by 2 mm to 3 mm.

Preferably, the step of performing the sintering step for curing the opecum is carried out at a sintering temperature of 1,320 ° C. when the metal copings are individually sintered by sintering the sintering furnace, When the sintering furnace is charged into the sintering furnace as a bundle, the sintering temperature is 1,350 ° C.

Preferably, the soft metal block is a cobalt-chromium alloy.

Preferably, the metal coping has a laminated structure in which a nickel-chromium alloy and a cobalt-chromium alloy are sequentially laminated, wherein the nickel-chromium alloy is formed at the bottom, and the cobalt-chromium alloy is capable of causing an allergic reaction And may be formed so as to cover the surface of the nickel-chromium alloy so as to cover the nickel-chromium alloy.

As described above, according to the present invention, when the metal coping is manufactured by cutting the soft metal block using the dental CAD cam and then sintering it, the cement space (adhesive space) The metal cement is sintered at a temperature of 1,250 ° C to 1,400 ° C, and the metal cement is sintered at a temperature of 1,250 ° C to 1,400 ° C. Can be compensated to optimize the suitability of the metal coping.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a flow chart for explaining a method of manufacturing a metallic ceramic tube according to an embodiment of the present invention; FIG.
FIGS. 2 to 6 are diagrams showing steps of each step of the method of manufacturing a metal ceramics pipe shown in FIG. 1. FIG.
7 is a conceptual diagram illustrating a cement space and an additional cement space according to the present invention.

BRIEF DESCRIPTION OF THE DRAWINGS The advantages and features of the present invention, and how to accomplish them, will become apparent by reference to the embodiments described in detail below with reference to the accompanying drawings. However, the present invention is not limited to the embodiments described below, but may be embodied in various other forms.

Hereinafter, the technical features of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is a flow chart for explaining a method of manufacturing a metal ceramics tube using a soft metal block according to an embodiment of the present invention, and FIGS. 2 to 6 are views showing a method of manufacturing a metal ceramics tube using the soft metal block shown in FIG. FIG. 2 is a view showing a soft metal block cut by milling, FIG. 3 is a view showing a process of sintering in a sintering furnace, and FIG. 4 is a view showing a process of completing and op- Fig. 5 is a view showing a porcelain forming process, and Fig. 6 is a view showing a completed metal porcelain tube.

Referring to FIGS. 1 and 2, first, a patient's mouth is scanned and a soft metal block 1 is cut using a dental CAD cam to form a metal coping 2 (ST1).

The method for forming the metal coping 2 is as follows.

First, the soft metal block 1 is prepared. At this time, the soft metal block 1 uses a cobalt-chromium alloy or a nickel-chromium alloy. Preferably, the nickel-chromium alloy is biologically harmful to the human body such as an allergic reaction, and thus a cobalt-chromium alloy is used.

Then, a patient's mouth is scanned with a scanner to generate an STL file, and a metal coping to be manufactured is designed using a dental CAD (design program). At this time, the metal coping design is designed to have a cement space (adhesive space) of 0.012 mu m to 0.017 mu m, preferably 0.015 mu m, considering the margins of the metal coping after sintering. The additional cement space is designed to be 0.030 mu m to 0.040 mu m, preferably 0.035 mu m. This can provide optimized internal fit between metal coping and abutment when the metal coping after sintering is suitable for the abutment.

FIG. 7 is a conceptual diagram illustrating a cement space and an additional cement space according to the present invention, and is a conceptual diagram showing a state in which a metal coping before sintering is applied to an abutment.

7, the cement space S1 is an interval between the side wall of the abutment 4 and the inner wall of the metal coping 2 before sintering, and this cement space S1 is formed by the metal coping 2 after sintering, 0.012 탆 to 0.017 탆, preferably 0.015 탆 in consideration of the reduction of the thickness of the substrate.

In order to prevent the cement adhesive filled in the cement space S1 from leaking to the outside of the metal coating 2, the margin M between the cement space S1 and the abutment 4, It is preferable that the portion where the abutment 4 directly contacts and the cement space S1 is not present is located 2 mm to 3 mm from the lower portion 4a of the abutment 4 in the upper direction. This is because when the cement adhesive leaks to the outside, the cement adhesive is melted by the saliva, and a gap is formed between the tooth and the metal coping, and food is caught by the gap, which rotates the tooth.

The additional cement space S2 is an interval between the occlusal surface (including the right / left angle) of the abutment 4 and the metal coping 2 before sintering and is different depending on the operator (dental director) in the process of manufacturing the abutment 4 This is designed to compensate for the irregular occlusal surface of the abutment 4 and is designed to be larger than the cement space S1, but is designed to be 0.030 mu m to 0.040 mu m, preferably 0.035 mu m.

When the design of the metal coping is completed, the STL file having been completed is applied to the CAM equipment, the soft metal block 1 is attached to the CAM equipment, and then the metal coping 4 is formed by cutting. At this time, the drill radius of the CAM equipment for cutting the soft metal block 1 is set to 0.3 mm to 0.5 mm, preferably 0.4 mm, and the drill radius offset is 0.7 mm to 0.9 mm, preferably 0.8 mm And the soft metal block 1 is cut to form a metal coping 2.

As shown in Figs. 1 and 3, a metal coping 2 formed by cutting is put into a sintering furnace 3 and sintered (ST2). The sintering process of the metal coping (2) is carried out at a temperature of 1,250 ° C to 1,400 ° C, preferably 1,320 ° C. In this case, when the sintering temperature is lower than 1,250 DEG C, the shrinkage ratio of the metal coating 2 is low and the internal fit between the abutment teeth 4 is low. When the sintering temperature is higher than 1,400 DEG C, And was inadequate for abutment teeth (4).

The soft metals such as cobalt-chromium alloy shrink in accordance with the shrinkage rate of the material in the process of sintering during shrinking. The shrinkage occurs almost uniformly in the X axis direction and the Y axis direction of the structure while the X axis And the Y axis. Accordingly, when the sintering temperature is excessively increased, excessive shrinkage occurs in the Z-axis direction, resulting in a problem that the metal coping 2 is not suitable for the abutment 4 after sintering.

Accordingly, in the present invention, the sintering temperature of the metal coping 2 is sintered at a temperature of 1,250 ° C. to 1,400 ° C., preferably 1,320 ° C., so that the metal coping 2 in the X-axis direction and the Y- 4), it is possible to prevent the metal coping 2 from being excessively reduced in the Z-axis direction while stably fitting the metal coping 2 to the abutment 4.

On the other hand, in the sintering process, the sintering temperature and the mooring time (the holding time at the final temperature) can be changed according to the number of the metal copings 2 injected into the sintering furnace 3. For example, when the metal copings 2 are individually sintered by sintering into the sintering furnace 3, the sintering temperature is preferably 1,320 DEG C, and the mooring time is about one hour. When a plurality of metal copings 2, for example, ten or twenty, are charged into the sintering furnace 3, the sintering temperature is preferably 1,350 ° C. At this time, 2 hours and 30 minutes.

When the sintering process for the metal coping 2 is completed, the metal coping 2 after sintering is applied to the abutment 4 as shown in Figs. 1 and 4, and the opaque 5 is applied to the surface of the metal copping 2 (ST3 ).

On the other hand, a degassing process is further performed to form an oxide film on the surface of the metal coping 2 for chemical bonding between the metal coping 2 and the porcelain 6 before the opaque process.

The step of applying the opec 5 is to cut off the inherent metallic color of the metal coping 2 and to remove the chemical color between the porcelain 6 to be formed later on the metal coping 2 and the oxide film formed on the surface of the metal copping 2 As a process for inducing bonding, paste opec can be used.

Thereafter, the opaque film 5 is applied to the surface of the metal coping 2, and then a baking step for curing the opaque film 5 is performed (ST4). At this time, the firing process is performed within the range of 940 캜 to 950 캜.

As shown in Figs. 1 and 5, when the baking process for the ope 5 is completed, the porcelain 6 is formed on the opaque 5 (ST5). At this time, the porcelain 6 includes primary and secondary laminating, and the primary laminating is laminated to a predetermined thickness using dentin powder, and the secondary laminating is performed on the surface thereof to protect the dentin It is laminated with milky white translucent hard enamel.

Thereafter, as shown in Figs. 1 and 6, the porcelain 6 is aged to complete the PFM metal porcelain tube 7 (ST6).

In the present invention, the metal coping is formed of a single layer of a cobalt-chromium alloy. However, for example, the nickel-chromium alloy and the cobalt-chromium alloy may have a laminated structure, And cobalt-chromium alloy can be obtained at the same time. At this time, the nickel-chromium alloy may be formed on the bottom, and the cobalt-chromium may be formed so as to cover the surface thereof so as to cover the nickel-chromium alloy which can cause the allergic reaction.

4 and 5, the undershoot reference numeral '8' denotes a metal color, and '9' denotes a pin coupled to a metal color bar, which can be manufactured during or after a cutting process using a CAM.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

1: soft metal block
2: metal coping
3: sintering furnace
4: abutment
5: Opec
6: Porcelain
7: PFM Metal Ceramic Tube
8: Metal color bar
9: Pin

Claims (5)

Cutting a soft metal block through a dental CAD / CAM to form a metal coping;
Sintering the metal coping at a temperature of 1,250 ° C to 1,400 ° C;
Applying the sintered metal coping to the abutment and then applying opac to the surface;
Performing a baking step of curing the opaque;
Forming a porcelain on top of the cured opacity; And
Firing the porcelain; , ≪ / RTI &
Wherein forming the metal capping comprises:
Scanning an oral cavity of a patient to generate an STL file;
Designing the metal coping using dental CAD so that the cement space is 0.012 mu m to 0.017 mu m and the additional cement space is 0.030 mu m to 0.040 mu m; And
Applying the designed STL file to the dental CAM equipment, attaching the soft metal block to the dental CAM equipment, cutting the soft metal block to form the metal coping;
The method of manufacturing a metal ceramics pipe according to claim 1,
The method according to claim 1,
Wherein the step of designing the metal coping comprises designing the metal coping such that the margin between the cement space and the abutment is spaced from 2 mm to 3 mm from the bottom of the abutment to the upper direction. Way.
The method according to claim 1,
In the step of performing the sintering step of curing the opaque, the sintering is performed at a sintering temperature of 1,320 ° C. when the metal coping is individually sintered by sintering the sintering furnace, and 10 or 20 metal copings are bundled Wherein the sintering temperature is 1,350 DEG C when the sintering furnace is charged into the sintering furnace.
The method according to claim 1,
Wherein the soft metal block is a cobalt-chromium alloy.
The method according to claim 1,
Wherein the nickel-chromium alloy is formed in a lower portion, and the cobalt-chromium alloy is a nickel-chromium alloy which is capable of causing an allergic reaction, wherein the nickel-chromium alloy is formed in a laminated structure in which a nickel-chromium alloy and a cobalt- Wherein the metal block is formed so as to surround the surface of the metal block so as to cover the chromium alloy.

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