WO2015037788A1 - Method for fabricating ready-made ceramic restoration, and ready-made ceramic restoration fabricated thereby for dental and veterinary services - Google Patents

Abstract

The present invention relates to: a method for fabricating a ready-made ceramic restoration by replacing a custom-made ceramic restoration, which is fabricated by an all ceramic crown or porcelain laminate method at a dental clinic or a dental technical laboratory, with a ready-made ceramic restoration made from alumina or zirconia, thereby enabling try-in and immediate provisionalization; and a ready-made ceramic restoration for dental and veterinary services fabricated by the method. The ready-made ceramic restoration of the present invention can reproduce the shape of a natural tooth as it is, can maintain the operated restoration shape even if used for a long time, can be easily fabricated, cuts down manufacturing costs, reduces the treatment period and the medical fee burden of a patient through immediate corrective work or reworking during an operation, promotes contamination prevention and adhesion improvement, allows the size of a restoration for each patient and the cementing position to be easily secured, and can maintain high strength and toughness.

Description

Method for manufacturing ready-made ceramic dental restorations and dental-veterinary ready-made ceramic dental restorations produced thereby

The present invention is to replace a custom-made ceramic restoration made of an all ceramic crown or porcelain laminate method in a dentistry or laboratory with a ready-made ceramic dental restoration of alumina or zirconia A method of manufacturing a ready-made ceramic dental restoration that enables try-in and immediate provisionalization and a dental-veterinary ready-made ceramic dental restoration produced by the method.

In general, when a tooth is unable to perform its original function due to tooth damage such as tooth decay, the shape and function of the tooth is removed through the prosthetic treatment method of removing the damaged part of the tooth and surrounding the damaged part with the tooth restoration. You will recover.

Dental restorations include crowns, inlays, onlays, stumps, veneers, and many other precious metal alloys such as gold alloys. Has been used.

However, because precious metal alloys such as gold alloys are expensive and differ from original teeth, their use is gradually decreasing for both cost and aesthetic reasons, and there are attempts to use inexpensive metal alloys instead of precious metal alloys. Is detrimental to human health.

Accordingly, in recent years, research has been conducted to manufacture dental restorations with ceramics that can produce aesthetic appearance corresponding to natural teeth as much as possible, and ceramic teeth such as crowns and veneers using all ceramic crowns or ceramic laminates as such dental restorations. There is a growing interest in restoration procedures.

Dental crowns / veneers are operations that remove caries and cover the teeth with crowns or apply very thin veneers directly to the tooth surface. It is widely used conservatively in place of whole skin for aesthetic improvement of anterior region or repair of posterior region for damaged teeth such as dwarf, fractured tooth, etc. It is possible to reproduce the natural tooth shape, less gingival irritation, and easy to control the appearance of teeth.

These dental crowns / veneers are generally manufactured and used with custom crowns and traditional ceramic laminates, but they do not satisfy strength and aesthetics at the same time, resulting in discoloration and fracture due to reduced strength, and are custom-made to have incorrect procedures. This has the disadvantage of being difficult to modify and reworking.

In addition, typical custom crown and porcelain laminates are manufactured through porcelain build-up or CAD / CAM processing in laboratories or dental clinics, and rework if defects due to micropores occur during build-up manufacturing. There is a disadvantage in that the processing cost and the procedure time is excessively generated because of the need, CAD cam processing is difficult to process the thin tooth restoration of 0.2 ~ 0.5 ㎜ has the disadvantage that additional manual work after processing.

Therefore, it is necessary to develop ready-made ceramic dental restorations that are stronger and more translucent than conventional custom crowns or ceramic laminates to shorten the treatment period and reduce the burden on the patient. The development of these ready-made ceramic dental restorations and ready-made tri-in dental restorations is still at a marginal level.

In the case of the conventional ready-made ceramic dental restorations, the ready-made ceramic dental restorations are immediately tried during prosthetic work, and saliva and blood in the tri-in process according to the tooth size selection and cementing position of individual patients. Due to the contamination caused by the adhesion, the adhesive holding force is lowered and cannot be reused.In the case of zirconia, the strength decrease due to the low temperature deterioration occurs during autoclave sterilization to remove the contamination. Do.

In addition, general ceramics are manufactured through a powder press molding process, and there is a disadvantage that excessive processing costs occur because pressure imbalance occurs during molding and defects occur and additional precision processing steps are required.

In order to solve the problem of the manufacture of ceramic dental restorations, the applicant of the present invention is a method of manufacturing a ceramic primary tube that can be widely used as a pediatric prosthetic primary tube using zirconia or alumina through Korean Patent Publication No. 10-1071554 Has been proposed.

The invention is produced by heating and injection molding raw materials including zirconia or alumina, a polymer and a colorant, and then extracting and degreasing the polymer in the injection molding and barrel processing after sintering, and can be easily manufactured with high aesthetics and biocompatibility. By enabling mass production, manufacturing cost is reduced, so that it can be widely used not only as a kindergarten but also as a material for other dental restorations.

By the way, the dental restoration manufactured using the above method does not have complete control of the micropores therein, and thus it is not a problem to be used as a temporary dental restoration material for the purpose of short-term treatment such as a primary tube, but it is a three-dimensional material that should be used for a long time. When manufacturing dental restorations such as three-dimensional crowns or thin plate veneers, fractures and surface abrasion of the ends are liable to occur due to micropores, and thus the durability of the treated dental restorations is lowered.

The problem to be solved by the present invention is a dental-veterinary container that can reproduce the shape and aesthetics of natural teeth while being excellent in strength and toughness, so that the dental restoration form can be maintained even after long-term use. To provide a molded ceramic dental restoration and a method of manufacturing the same.

In order to solve the above problems, the present invention is mixed with a raw material comprising alumina or zirconia forming the skeleton of the dental restoration, a polymer that lowers the viscosity during injection molding to give ductility and a colorant for imparting a color similar or distinct to natural teeth. Doing; Heating the raw materials such that the polymers contained in the mixed raw materials have ductility; Injection molding the heated raw material; A polymer extraction step of lowering brittleness and ductility of the injection-molded extrudate; Degreasing to completely remove the polymer component from the injection from which some of the polymer is extracted by the polymer extraction; Atmospheric sintering the degreasing body from which the polymer component has been removed to improve mechanical properties; Pressure sintering the atmospherically sintered sintered compact to improve light transmittance and mechanical properties; Heat-treating the pressure-sintered sintered compact for decarburization and light transmission reproduction; And barrel-processing the heat-treated sintered body in order to polish the outer surface of the heat-treated sintered body to give glossiness and to remove burrs.

At this time, the raw material preferably contains 80 to 90% by weight of zirconia or alumina, 9 to 19% by weight of the polymer and 0.005 to 5% by weight of the colorant.

In addition, the polymer preferably includes ethylene vinyl acetate, paraffin wax, low density polyethylene and stearic acid, 7 to 30% by weight ethylene vinyl acetate, 50 to 65% by weight paraffin wax, 15 to 35% by weight low density polyethylene, and stearic acid 1 More preferably, it contains -5 wt%.

In addition, the colorant is preferably at least one selected from the group consisting of white titanium oxide, red iron oxide, yellow iron oxide and pink erbium oxide.

In addition, the polymer extraction step is preferably made by stirring the injection molded product at a temperature of 40 ~ 90 ℃ in acetone, N-methylpyrrolidone or a mixed solvent thereof for 1 to 24 hours.

In addition, the degreasing step is a process of heat treatment for 6 to 48 hours at a temperature of 500 ~ 1200 ℃ extracted injection part of the polymer, the step of atmospheric pressure sintering 1200 ~ 1650 degreasing body from which the polymer is removed It is made of a heat treatment for 6 to 48 hours at a temperature of ℃, the degreasing step and atmospheric pressure sintering step is preferably made continuously in one furnace.

In addition, the pressure sintering step is preferably made of a process of heat-treating the pressure-sintered sintered body for 6 to 24 hours at a temperature of 1200 ~ 1650 ℃ under pressure of 500 ~ 1500 bar.

In addition, the step of heat-treating the pressure-sintered sintered body is preferably made of a process of heat-treating the pressure-sintered body at 500 ~ 1500 ℃, more preferably made in a state of being cut off from the outside air.

The present invention also provides a dental-veterinary ready-made ceramic dental restoration produced by the above method.

The ceramic dental restoration of the present invention can reproduce the shape of the natural teeth without implementing ceramic material build-up or CADCAM by implementing the shape, light transmittance and aesthetics of the natural teeth in alumina or zirconia dental restorations.

In addition, the strength and toughness properties are superior to those of general ceramic lamination methods, so that even after long-term use, the dental restoration form can be maintained as it is, and it can be easily manufactured using injection molding and mass production is possible. It can be widely used as a dental restoration because it is reduced and inexpensive.

In addition, alumina or zirconia is injection molded to produce preformed dental restorations and preformed tri-in dental restorations, thereby reducing the duration of treatment and reducing the burden on the cost of treatment through immediate modification or rework during the procedure.

In addition, the ready-made tri-in dental restoration of the present invention can be produced in a variety of colors, such as pink (pink), blue (black), black (black) is easy to secure identification and remove the contamination by saliva and blood poetic It is possible to prevent contamination and improve adhesive strength of the male moldable dental restorations, and to easily secure the size and cementing position of dental restorations for each patient and to maintain high strength and toughness by eliminating the autoclave sterilization process of dental restorations.

1 is a manufacturing process diagram of a ready-made ceramic dental restoration in accordance with a preferred embodiment of the present invention.

FIG. 2 is a view for explaining a process in which the degreasing process and the sintering process of the present invention are performed in-situ in one furnace.

3 is a view for explaining the pressure sintering process of the present invention.

The present invention relates to a method of manufacturing a ready-made ceramic dental restoration and to a dental-veterinary ready-made ceramic dental restoration prepared by such a method, the method of manufacturing a ready-made ceramic dental restoration is alumina or zirconia forming the skeleton of the dental restoration Mixing raw materials including a polymer that lowers the viscosity during injection molding to give ductility and a colorant for imparting a color similar to or distinct from natural teeth; Heating the raw materials such that the polymers contained in the mixed raw materials have ductility; Injection molding the heated raw material; A polymer extraction step of lowering brittleness and ductility of the injection-molded extrudate; Degreasing to completely remove the polymer component from the injection from which some of the polymer is extracted by the polymer extraction; Atmospheric sintering the degreasing body from which the polymer component has been removed to improve mechanical properties; Pressure sintering the atmospherically sintered sintered compact to improve light transmittance and mechanical properties; Heat-treating the pressure-sintered sintered compact for decarburization and light transmission reproduction; And barrel-processing the heat-treated sintered body in order to polish the outer surface of the heat-treated sintered body to give glossiness and to remove burrs.

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

However, the following examples are only for illustrating the present invention, and the present invention is not limited to the following examples, and may be changed to other embodiments equivalent to substitutions and equivalents without departing from the technical spirit of the present invention. It will be apparent to those skilled in the art to which the present invention pertains.

 The present invention proposes a prosthetic ceramic dental restoration for prosthesis, which can meet the esthetics and strength at the same time, can be mass-produced, can improve the quality stability of the product, and can be easily manufactured by injection molding.

Figure 1 shows the manufacturing process of the ready-made ceramic dental restoration in accordance with a preferred embodiment of the present invention.

Method for manufacturing a ready-made ceramic dental restoration according to an embodiment of the present invention is to give a similar or distinctive color to the alumina or zirconia forming the skeleton of the dental restoration, the polymer and the softness to lower the viscosity during injection molding and give a softness Mixing the raw materials including the colorant (S10); Heating the raw materials such that the polymer contained in the mixed raw materials has ductility (S20); Injection molding the heated raw material (S30); Polymer extraction step (S40) to lower the brittleness and ductility of the injection-molded injection molding; Degreasing to completely remove the polymer component from the injection part in which some of the polymer is extracted by the polymer extraction (S50); Atmospheric sintering the degreased body from which the polymer component has been removed to improve mechanical properties (S60); Pressure sintering the atmospherically sintered sintered compact to improve light transmittance and mechanical properties (S70); Heat-treating the pressure-sintered sintered compact for decarburizing and light transmitting (S80); And barrel finishing to polish the outer surface of the heat-treated sintered body to give glossiness and to remove burrs (S90).

First, 80 to 90% by weight of zirconia (ZrO ₂ ) or alumina (Al ₂ O ₃ ), the main material, 9 to 19% by weight of the polymer to have a viscosity during the injection molding process, and 0.005 to 5% by weight of a colorant for color expression. Prepare the raw materials by mixing.

The polymer preferably includes ethylene vinyl acetate (EVA), paraffin wax, low density polyethylene (LDPE) and stearic acid, and based on the total weight of the polymer It is more preferable to contain 7-30 wt% of vinyl acetate, 50-65 wt% of paraffin wax, 15-35 wt% of low density polyethylene, and 1-5 wt% of stearic acid.

The colorant is to impart a color similar to or distinct from natural teeth, and is an inorganic colorant, such as white titanium oxide (TiO ₂ ), red iron oxide (Fe ₂ O ₃ ), yellow iron oxide (Fe ₂ O ₃ ), and pink erbium oxide (Er). ₂ O ₃ ) or a mixture of two or more thereof is preferable.

When the red iron oxide or yellow iron oxide is mixed with alumina or zirconia and sintered, it becomes light yellow similar to the color of natural teeth. Titanium oxide has a white color to give a color very similar to that of natural teeth. It is very different from natural teeth and can be applied as a tri-in dental restoration.

The tri-in tooth restoration is used for the preliminary test work performed before the pre-molded dental restoration work, which can be implemented in various colors such as pink, blue, and black, so that the color can be clearly distinguished from natural teeth. In addition, it is possible to immediately determine the suitability of the size, shape, color, and dentition of the tooth restoration for each patient's teeth, and to determine the exact cementing position in advance. Shorten the duration and relieve the patient of the cost of treatment.

In addition, since the contamination by saliva and blood is partially removed by the tri-in dental restoration during the treatment process of the tri-in dental restoration, the contamination is reduced during the work of the ready-made dental restoration, which improves the adhesion of the preformed dental restoration. It works.

After the mixing process, a grinding process may be added to secure and refine the size uniformity of the raw material particles, and the grinding may use a wet ball milling process.

Specifically, the ball milling process is performed by charging raw material ceramic (alumina or zirconia), polymer and colorant into a ball milling machine, mixing a solvent such as water or alcohol, and then rotating the ball mill at a constant speed. Raw material particles are mechanically ground and uniformly mixed.

The balls used for ball milling may use balls made of ceramics such as zirconia or alumina, and the balls may be all the same size or may be used with balls having two or more sizes.

Grinding to the size of the target particles by adjusting the size of the ball, the rotational speed of the ball mill, the milling time, for example, the size of the ball 1 ~ 30 mm, the rotational speed of the ball mill 50 ~ 500 rpm, milling time It can be set in the range of 1 to 48 hours.

By this ball milling operation, the raw material is pulverized into fine-sized particles and has a spherical uniform particle size distribution.

Next, the mixed raw material is heated to a temperature of 40 to 180 ° C. for 1 to 12 hours, and the water contained in the raw material (water or alcohol component used as a solvent in the wet ball milling process) is removed by heating, and the polymer Is lowered to be softer to facilitate the injection molding process.

When the heating is completed, the raw material is injected into the injection molding machine, and the injection molding, the injection temperature is preferably 130 ~ 200 ℃, the injection molding process is a well known process, so a detailed description thereof will be omitted.

The injection molded product in such an injection molding process is very brittle and requires great care during operation. Accordingly, in order to smoothly process and improve the quality of the product, a process for reducing the brittleness and ductility of the injection molded injection molded product is required. do.

To this end, it is necessary to carry out the extraction process of the polymer contained in the injection molding, ethylene vinyl acetate, paraffin wax contained in the polymer by stirring for 1 to 24 hours, preferably 6 to 12 hours in an extract of 40 ~ 90 ℃ Part of the low density polyethylene and stearic acid is eluted into the extract and removed.

As the extract, it is preferable to use a solvent such as acetone, N-methylpyrollidone or a mixture thereof, which can dissolve the polymer component.

Next, a degreasing process is performed to completely remove the polymer component from the injection product in which a part of the polymer is extracted by the polymer extraction process, and the degreasing process is performed at 500 to 1200 ° C., preferably at 600 to 1000 ° C. for 6 to 48 hours. It consists of a process of heat treatment.

If it is not subjected to the degreasing process, the polymer component remaining in the injection molding may form bubbles in the sintering process described below, which may act as a factor of deteriorating the mechanical properties of the sintered body, and may generate voids or fine cracks in the sintered body. You can.

By the way, the injection product from which the polymer is removed by the polymer extraction and degreasing process has a low brittleness as compared with the injection molding immediately after injection molding, while the ductility increases, which may deform the product during the prosthetic operation.

In order to prevent this, the degreased body from which the polymer of the degreasing process is removed is subjected to atmospheric pressure sintering. The atmospheric pressure sintering process is performed to improve the mechanical properties of the degreased body. Heat treatment for ˜48 hours.

The degreasing process and atmospheric pressure sintering process should be performed continuously in one furnace (furnace, as described below) to ensure the process efficiency.

FIG. 2 is a view illustrating a process in which a degreasing process and a sintering process are performed in-situ in one furnace.

Referring to Figure 2, after the injection of the injection part of the polymer extracted in the furnace, using the heating means provided in the furnace temperature of the furnace is higher than the temperature of the polymer burning, the temperature lower than the sintering temperature 500 ~ 1200 It is raised to the temperature of ℃ (t1 section of Figure 2).

At this time, the temperature increase rate is preferably 1 ~ 50 ℃ / min, when the temperature increase rate exceeds 50 ℃ / min thermal stress may act on the injection molding by a sudden temperature change, if the time is less than 1 ℃ / minute long There is a disadvantage in that productivity is low.

When the temperature of the furnace reaches a temperature of 500 ~ 1200 ℃ is maintained for 6 to 48 hours (t2 section of Figure 2) to remove the polymer by burning, the polymer components remaining in the injection molding ethylene vinyl acetate, paraffin wax, low density polyethylene and Stearic acid is completely removed by burning or evaporating at a temperature of 500 ~ 1200 ℃, it is possible to easily remove the polymer component present in the injection molding from the injection molding as described above.

After the degreasing process is completed, the temperature of the furnace is raised to a target atmospheric pressure sintering temperature of 1200 ~ 1650 ℃ (t3 section of Figure 2) and the temperature increase rate at this time is preferably 5 ~ 50 ℃ / min, the temperature increase rate is 50 ℃ In case of exceeding / min, thermal stress may act on the degreasing body due to a sudden temperature change, and in the case of less than 5 ° C / min, it takes a long time to have a disadvantage in decreasing productivity.

When reaching the atmospheric pressure sintering temperature of 1200 ~ 1650 ℃ of the furnace is maintained for 6 to 48 hours (t4 section of Figure 2), the sintering temperature is considered in consideration of the diffusion of particles, necking (necking) between the particles If the sintering temperature is too high, the mechanical properties may be degraded due to excessive growth of the particles, and if the sintering temperature is too low, the characteristics of the sintered body may be deteriorated due to incomplete sintering.

As described above, the microstructure, particle size, and the like of the sintered body are different depending on the sintering temperature. This is because surface diffusion is dominant when the sintering temperature is low, while lattice diffusion and grain boundary diffusion are performed when the sintering temperature is high.

 In addition, when the sintering time is more than 48 hours, it is not only economically difficult to expect more sintering effects because energy consumption is high, and when the sintering time is less than 6 hours, the characteristics of the sintered body may be poor due to incomplete sintering.

When the atmospheric pressure sintering operation is completed, the furnace is cooled, and the cooling of the furnace may be naturally cooled by cutting off the power of the heating means, or may be cooled by artificially setting a temperature drop rate (for example, 10 ° C./minute).

By the way, in the atmospheric sintered product, air mixed during mixing of raw materials forms fine pores inside the injection molding during the injection molding process, and these fine pores remain intact even during degreasing and sintering, fracture of the dental restoration manufactured according to the present invention. And surface wear.

Therefore, it is necessary to remove the fine pores remaining in the atmospheric sintered product, and for this purpose, in the present invention, the atmospheric pressure sintered sintered body is sintered again in a pressurized state to improve the mechanical properties and light transmittance of the sintered body.

The pressure sintering is carried out by applying hot isostatic pressing (HIP), and heat treatment at 1200 ~ 1650 ℃, preferably 1200 ~ 1500 ℃ under a pressure of 500 ~ 1500 bar for 6 to 24 hours .

Figure 3 is a view for explaining the pressure sintering process, it will be described in detail with reference to this, first charging the pressure-sintered sintered body into the furnace and then using the heating means and pressure apparatus provided in the furnace temperature of the furnace It raises to 1200-1650 degreeC which is target pressure sintering temperature (t1 section of FIG. 3).

At this time, the pressure is preferably 500 to 1500 bar, and the temperature increase rate is preferably 5 to 50 ° C./min. When the temperature increase rate exceeds 50 ° C./min, thermal stress may act on the sintered body by a sudden temperature change. In the case of less than 5 ℃ / min has a disadvantage that takes a long time productivity is lowered.

When the furnace reaches the pressure sintering temperature of 1200 ~ 1650 ℃ 6 to 24 hours to maintain the sintering (t2 section of Figure 3), the sintering temperature is the most suitable temperature to produce a high-density sintered body while suppressing grain growth Range.

When pressure sintering is completed, the furnace is cooled (t3 section in FIG. 3), and the cooling of the furnace is to naturally cool by cutting off the power of the heating means or artificially set a temperature drop rate (for example, 10 ° C / min). It can also cool.

Pressurized sintering is performed under high pressure to suppress the temperature rise of the sintered product, so that uniform quality can be obtained in the cross-sectional, length, and width directions, and a pressurized sintered product having a smooth surface at a density of 100% is obtained. It is possible to obtain a dental restoration, such as a veneer with a flat plate with no relief.

Next, the pressure sintered body is heat-treated at 500 to 1500 ° C. for the decarburization and light transmission reproduction of the pressure-sintered pressure sintered body. When heating, decarburization occurs at the surface of the sintered body, and the hardness of the core is maintained while the toughness of the surface is increased. The change in the properties of the ceramic depending on the content is caused by the higher hardness of the ceramic and the higher tensile strength of the ceramic.

When the ratio of oxygen is increased by the penetration of external air during the decarburization heat treatment, the surface decarburization of the sintered body is not performed smoothly, so it is preferable to perform the decarburization heat treatment in a state in which the external air is blocked.

After the decarburization heat treatment is completed, the outer surface of the sintered body is polished to give glossiness and barrel processing is carried out for 12 to 72 hours to remove fine burrs. The barrel processing is to put the object to be treated in a rotating container and rotate with the abrasive. As a finishing method for polishing, it is generally used for burr removal, corner trimming, surface finishing, or gloss finishing, and this barrel processing is well known in the art, and thus description thereof is omitted.

The ready-made ceramic dental restoration of the present invention prepared as described above is particularly suitable for the manufacture of crowns or veneers, and has a three-dimensional three-dimensional conformational crown or thin plate shape without a separate manufacturing process through injection molding and pressure sintering. Since the veneer shape can be implemented, the manufacturing process can be shortened, thereby reducing manufacturing time and cost.

Custom dental dental restorations manufactured by ceramic crowns or porcelain laminates in conventional dental or laboratory can be replaced with ready-made ceramic dental restorations of alumina or zirconia according to the present invention. Or it can be widely used as a veterinary dental restoration.

Claims (11)

1. Mixing raw materials including alumina or zirconia forming a skeleton of the dental restoration, a polymer which lowers the viscosity during injection molding to give softness and a colorant for imparting a color similar to or distinct from natural teeth;

   Heating the raw materials such that the polymers contained in the mixed raw materials have ductility;

   Injection molding the heated raw material;

   A polymer extraction step of lowering brittleness and ductility of the injection-molded extrudate;

   Degreasing to completely remove the polymer component from the injection from which some of the polymer is extracted by the polymer extraction;

   Atmospheric sintering the degreasing body from which the polymer component has been removed to improve mechanical properties;

   Pressure sintering the atmospherically sintered sintered compact to improve light transmittance and mechanical properties;

   Heat-treating the pressure-sintered sintered compact for decarburization and light transmission reproduction; And

   Barrel processing the heat-treated sintered body in order to polish the outer surface of the heat-treated sintered body to give glossiness and to remove burrs.
2. The method according to claim 1,

   The raw material is 80 to 90% by weight of zirconia or alumina, 9 to 19% by weight of the polymer and 0.005 to 5% by weight of the colorant.
3. The method according to claim 1,

   Wherein said polymer comprises ethylene vinyl acetate, paraffin wax, low density polyethylene, and stearic acid.
4. The method according to claim 3,

   The polymer is 7-30% by weight of ethylene vinyl acetate, 50-65% by weight of paraffin wax, 15-35% by weight of low-density polyethylene and 1-5% by weight of stearic acid.
5. The method according to claim 1,

   And the colorant is at least one selected from the group consisting of white titanium oxide, red iron oxide, yellow iron oxide and pink erbium oxide.
6. The method according to claim 1,

   The polymer extraction step is a method for producing a preformed ceramic dental restoration, characterized in that the injection is acetone, N-methylpyrrolidone or a mixed solvent of these for 1 to 24 hours at a temperature of 40 ~ 90 ℃.
7. The method according to claim 1,

   The degreasing step is a process of heat-treating an injection product from which a part of the polymer is extracted for 6 to 48 hours at a temperature of 500 ~ 1200 ℃, the step of atmospheric pressure sintering is a 1200 ~ 1650 ℃ It is made of a heat treatment for 6 to 48 hours at a temperature, wherein the step of degreasing and atmospheric pressure sintering is a method of manufacturing a ready-made ceramic dental restoration, characterized in that made in one furnace continuously.
8. The method according to claim 1,

   The pressure sintering step is a method of manufacturing a ready-made ceramic dental restoration, characterized in that the pressure-sintered sintered body is heat-treated for 6 to 24 hours at a temperature of 1200 ~ 1650 ℃ under a pressure of 500 ~ 1500 bar.
9. The method according to claim 1,

   The step of heat-treating the pressure-sintered sintered body is a method of manufacturing a pre-formed ceramic dental restoration, characterized in that the pressure sintered body is heat-treated at 500 ~ 1500 ℃.
10. The method according to claim 9,

    The heat treatment of the pressure sintered body is a method of manufacturing a ceramic ceramic restoration of the pre-formed, characterized in that made in the state of being blocked with external air.
11. Dental-veterinary ready-made ceramic dental restorations produced by the method of any one of claims 1 to 10.

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