KR20180011898A - Dental pocelain containing a lithium disilicate and method of manufacturing the same - Google Patents

Abstract

The present invention relates to a dental ceramic ingot using lithium disilicate and a manufacturing method of the same. The dental ceramic ingot comprises: a first composition for assigning a high intensity characteristic and uniformity of a color pigment as a composition with a lithium disilicate crystal phase; a second composition for lowering a coefficient of thermal expansion, keeping a softening temperature, and securing various thermal expansion sections; a third composition for controlling transparency, and adjusting a softening temperature and a melting temperature; a color composition for acquiring a natural tooth; a metal nitride for improving binding power of an oxygen atom and metal; and a specific composition ratio of the first to third compositions, the color composition, and the metal nitride according to a purpose. The present invention can be used for inlay which can be directly casted and pressurized, a crown which can build a porcelain or ceramic ingot, and a CAD/CAM block which is easy to process.

Description

TECHNICAL FIELD [0001] The present invention relates to a dental ceramic ingot using lithium disilicate and a method for manufacturing the same.

The present invention relates to a dental ceramic ingot using lithium disilicate and a method of manufacturing the same. More particularly, the present invention relates to a dental ceramic ingot using a lithium disilicate, ) And a CAD / CAM block for easy machinability, and a process for producing the same.

Generally, teeth are damaged or missing for various reasons such as aging, tooth decay. If the teeth are damaged or missing, the pronunciation becomes inaccurate, not only inconvenient to chew, but also adversely affects the taste and aesthetics.

In addition, when the tooth is left in a defective state for a long time, the adjacent teeth move to an empty space where the tooth is missing, and the normal arrangement of the teeth is shifted. As a result, food is inserted between the teeth, In the worst case, normal teeth should be removed. In particular, the damage or deficiency of the molar teeth can not be applied properly, and therefore, the health of the tooth is adversely affected. In particular, the damage of the front teeth gives a lethal impression to the appearance and an unpleasant aesthetic to others.

Therefore, artificial teeth have been developed and used to replace missing or damaged teeth. Unlike general materials, artificial tooth materials have many limitations due to the special environment in the oral cavity. That is, materials of artificial teeth have been selected in consideration of a large number of environmental factors such as a very wet environment in the oral cavity, a high impact pressure / occlusal pressure generated during chewing, a rapid temperature change, biocompatibility, and innumerable bacteria.

Dental porcelain, also known as porcelain or ceramics in the dental field, was first claimed by Fauchard to be used as a dental porcelain in 1728, and in 1808, Fonzi welded porcelain to metal to make porcelain artificial teeth. Subsequently, porcelain was developed in 1956, which was welded to a gold alloy. In 1970, it was developed as a porcelain that was welded to a non-precious metal alloy.

Such porcelain is basically a powdery material made of glass. In the 1990s, all ceramic crowns, porcelain laminate veneers and porcelain inlays using computer CAD / CAM were developed.

Porcelain made of ceramics is classified into dental porcelain for press casting, dental porcelain for metal porcelain system, dental porcelain for cutting, and general porcelain porcelain according to ISO 6872 standard. The present invention is classified as a ceramic ingot corresponding to a dental porcelain for pressing casting, and includes contents that can be applied to a dental porcelain for cutting processing from the manufacturing process technique of the ingot.

That is, the dental cast iron for press casting is an ingot of a ceramic material. The method of using the ingot is such that the ingot is semi-melted at a high temperature (920 to 950 ° C) and cast by pressurization to form a shape for preserving teeth, Alternatively, when this ingot is used for a crown, a porcelain powder having a low melting point (800 ° C or less) may be formed to give a more aesthetic characteristic, or a block shape may be formed and a three- It is used to make artificial teeth by cutting.

      However, the conventional ceramic ingot has a thermal expansion coefficient in a specific region according to each manufacturer, and other ceramics (porcelain) powders may be formed for use as a crown or the like in addition to the inlay after pressure casting. At this time, the thermal expansion coefficient, , The melting temperature and the like are difficult to control, and there is a disadvantage that cracks are often generated due to concentration of stress due to temperature difference during cooling.

In general, a ceramic ingot used for pressure casting uses a composition of a lithium disilicate crystal phase or lithium metasilicate crystal phase, and a block shape used for cutting processing uses a composition containing a large amount of a lithium metasilicate crystal phase to improve workability And there is a difference in crystal phase depending on the use of the ceramic ingot for press casting and the ceramic block for cutting. Thus, there is a disadvantage that various compositions must be formed depending on the application.

It is also known to cast a desired shape or block by performing a secondary melting process or a remelting process to form blocks other than the shape of the ingot. In this process, melting is carried out at a high temperature, the segregation of the high-temperature oxide is reduced, and the oxide is crushed to a uniform size in order to obtain a homogeneous composition. There is a problem in that the number of work processes is increased and an economical cost is added.

Document 1. Korean Patent No. 10-1262121 (2013.05.14) Korean Patent Laid-Open No. 10-2012-0130088 (November 28, 2012) Literature 3. Korean Patent No. 10-1512176 (Apr. 15, 2015) Document 4: Korean Patent No. 10-1450190 (Oct. 20, 2014) Korean Patent Laid-Open No. 10-2015-0013225 (2015.02.04)

Morsi M. Mahmoud, Crystallization of lithium disilicate glass using variable frequency microwave processing, Apirl 24, 2007

Disclosure of the Invention The present invention has been made to solve the above-mentioned problems of the prior art, and it is an object of the present invention to provide a crown and a CAD / CAM block capable of directly casting and casting porcelain and ceramic ingots, It is another object of the present invention to provide a dental ceramic ingot using such a lithium disilicate.

Another object of the present invention is to provide various compositions having properties such as thermal expansion coefficient, softening temperature and melting temperature of ceramics, and to provide a composition having such properties as a thermal expansion coefficient, a softening temperature and a melting temperature So as to provide a ceramic material having various performances and performance of a specific composition.

It is still another object of the present invention to provide a method of manufacturing a ceramic ingot or a ceramic ingot using a powder phase capable of complementing strength by using a crystal phase powder in which a lithium disilicate crystal phase having high strength coexists with a lithium metasilicate crystal phase having excellent machinability, And a process for preparing the same.

It is another object of the present invention to improve the economical efficiency by shortening the process of keeping the shape of the powder constant and making the powder finer by continuing the melting and pulverization process of the glass raw material. In addition, the production process of the cast ingot and the subsequent nucleation and crystallization heat treatment process are shortened from the crystallization heat treatment, molding and firing process by using the initial powdered ceramic powder without making the ceramic ingot, and various ingots or blocks And a method for manufacturing the same.

It is possible to use a densilicate which can be used for inlay by direct pressure casting, which is one of the objects of the present invention, or which can be used as a crown or CAD / CAM block capable of forming porcelain and ceramic ingots A dental ceramic ingot is a composition having a lithium disilicate crystal phase, which comprises a first composition that imparts high strength characteristics and uniformity of a color pigment; A second composition for lowering the thermal expansion coefficient and maintaining the softening temperature to secure various thermal expansion zones; A third composition for controlling the softening temperature and the melting temperature while controlling the transparency; A color composition for obtaining natural teeth; Metal nitrides that increase the bonding strength between oxygen atoms and metals; And the first to third compositions, the color composition, and the metal nitride are achieved at a predetermined composition ratio depending on the use.

The first composition may further contain 12 to 17% by weight of Li ₂ O, 5 to 9% by weight of P ₂ O _5, 5 to 5% by weight of K ₂ O, 0.5 to 2.5% by weight of Na ₂ O, 0.7 to 4.7% 3.5 to 6 wt% of Al ₂ O ₃ , 1 to 2 wt% of CaO, 1 to 2 wt% of B ₂ O ₃ , and 0.01 to 1.5 wt% of CeO ₂ , TiO ₂ , ZrO ₂ , Y ₂ O ₃ , And SiO ₂ By weight and 48.4 to 72.0% by weight.

The second composition may further comprise 10 to 15% by weight of Li ₂ O, 5 to 9% by weight of P ₂ O _5, 5 to 5% by weight of K ₂ O, 0.1 to 1.5% by weight of Na ₂ O, 1.5 to 4.0% 6 to 10 wt% of Al ₂ O ₃ , 0.5 to 2 wt% of CaO, 0.5 to 1.5 wt% of B ₂ O ₃ , and 0.01 to 1.2 wt% of CeO ₂ , TiO ₂ , ZrO ₂ , Y ₂ O ₃ , By weight and SiO ₂ 52.7 to 74.0% by weight.

Further, the third composition is SiO ₂ 70 to 80% by weight of Li ₂ O, 20 to 30% by weight of Li ₂ O, 0.01 to 0.5% by weight of CaO, and 0.01 to 0.5% by weight of CeO 2.

In addition, the color composition may be selected from among oxides containing Zr Pr, oxides containing Kr and Cr, color pigment oxide groups containing Ti, Cr, and Sb, And a predetermined amount of an oxide composed of Ce · Te is further included.

The metal nitride is Si ₃ N ₄ , and the amount of the metal nitride is 5% by weight or less based on the total amount of the first to third compositions.

Another aspect of the present invention is a method for manufacturing a dental ceramic ingot, comprising the steps of mixing and melting a composition of claim 1 or claim 5, heating the mixture at a high temperature to obtain a molten composition; Passing the molten composition through a water-cooled alumina roll to obtain an amorphous flaky glass; Processing the amorphous flaky glass to a fine powder of 200 μm or less to obtain a powder raw material; Mixing a color raw material with a powder raw material to obtain a mixed raw material; Adding a binder to the mixed raw material and re-pulverizing the mixture to obtain a molding raw material; Heating at a temperature of 40 to 60 MPa or more to obtain a molded article, degreasing the molded article to obtain a degreased molded article, and heat treating the degreased molded article to obtain a sintered article.

In the step of obtaining a degreased molded product, the heating temperature is raised to 600 ° C at a rate of 10 to 20 ° C / min, and at a temperature of 600 to 800 ° C, the degreased molded product is obtained at a heating rate of 10 ° C / do.

The degreased molded article is characterized in that it is heated to 800 to 925 ° C at a temperature raising rate of 15 to 20 ° C / min and heat-treated within 5 minutes.

The present invention provides a method of manufacturing a dental ceramic ingot using lithium disilicate, comprising the steps of forming an ingot from a mold by melting the glass at a high temperature by molding and sintering the already crystallized powder, And the step of crystallizing the ingot are omitted, and various ingot or block shapes for CAD / CAM can be directly formed.

Further, by adding not more than 5% by weight of a nitrogen compound containing a nitrogen atom, N-Si-O bond is induced in the bond of oxygen atom and O-Si-O to increase the bonding force of the oxide, ).

The ceramic ingot containing the lithium disilicate of the present invention can be formed into a ceramic form by directly pressing the ceramic ingot to form a crown shape, followed by further imparting esthetics to the teeth.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a graph showing the shape and size
Fig. 2 is a graph showing the results of DSC thermal analysis for the ceramic powder of the present invention
3 is a graph showing the results of thermal expansion test for the first composition of the present invention
4 is a graph showing the results of DSC thermal analysis of the ceramic powder of the present invention
5 is a graph showing the results of thermal expansion test for the third composition of the present invention

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. However, the embodiments described below can be modified in various ways to have a general knowledge in the field, and thus the scope of the present invention is not limited to this embodiment.

 The present invention basically comprises a glass containing lithium disilicate crystals, and the amorphous crystal phase glass powder and the crystal phase lithium disilicate glass powder are combined to produce various uses such as an ingot for pressure casting or a working block.

It is possible to use a lithium disilicate which can be used for inlay by direct pressure casting according to the preferred embodiment of the present invention or can be used as a crown or CAD / CAM block capable of forming porcelain and ceramic ingots Wherein the composition having a lithium disilicate crystal phase comprises a first composition which imparts high strength properties and uniformity of a color pigment; A second composition for lowering the thermal expansion coefficient and maintaining the softening temperature to secure various thermal expansion zones; A third composition for controlling the softening temperature and the melting temperature while controlling the transparency; A color composition for obtaining natural teeth; Metal nitrides that increase the bonding strength between oxygen atoms and metals; And the first to third compositions, the color composition, the metal nitride, and the composition of the predetermined composition ratio depending on the application.

The first composition comprises 12 to 17 wt% Li ₂ O, 5 to 9 wt% P ₂ O ₅ , K ₂ O 2 to 5 wt%, Na ₂ O 0.5 to 2.5 wt%, ZnO 0.7 to 4.7 wt%, Al ₂ 3.5 to 6% by weight of O ₃ , 1 to 2% by weight of CaO, 1 to 2% by weight of B ₂ O ₃ and 0.01 to 1.5% by weight of CeO ₂ , TiO ₂ , ZrO ₂ and Y ₂ O ₃ , , SiO ₂ Preferably 48.4 to 72.0% by weight.

Crystalline phases of the first to third compositions were analyzed using XRD analysis equipment, and thermal expansion coefficient, glass transition temperature and softening temperature were analyzed using a thermal expansion test analyzer.

Powder of each composition was used for the analysis of the crystal phase, thermal analysis such as thermal expansion coefficient was made by making a specimen having a diameter of 5 mm and a length of 20 mm, selecting the most desirable composition ratio, molding, degreasing and firing using a powder molding method An ingot was prepared.

The raw materials for each composition are weighed in each component ratio, mixed evenly, and melted at 1420 ° C or higher in the electric furnace. The molten and viscous glass is directly passed through a ceramic roller through which cooling water flows to flatten the glass.

In general, the melting process of glass is performed by cooling the molten glass in an electric furnace to form amorphous crystal glass, cooling the molten glass by cooling it, and then feeding it to an alumina roller to perform roughing and pulverizing. However, The glass is immediately crushed and pulverized to shorten the time and the process of refining the powder.

[Composition ratio of composition and heat treatment]

The first composition for imparting high strength is a composition having a lithium disilicate crystal phase having high strength properties, and comprises 12 to 17% by weight of Li 2 O, 5 to 9% by weight of P 2 O 5, 0.5 to 2.5% by weight of K 2 O 2, 0.5 to 2.5% 0.7 to 4.7 wt% of Al 2 O 3, 3.5 to 6 wt% of Al 2 O 3, 1 to 2 wt% of CaO, 1 to 2 wt% of B 2 O 3 and 0.01 to 1.5 wt% of CeO 2, TiO 2, ZrO 2 and Y 2 O 3, It is the main component.

FIG. 3 shows the results of the thermal expansion test for the first composition of the present invention. As a result of DSC thermal analysis of the first composition ceramic powder, nucleation and crystallization proceeded at about 608 ° C as the temperature increased, The melting of this ceramic powder was found to be complete at about 918 ° C.

As a result of the thermal expansion test for the first composition, the glass transition temperature was about 540 캜, the glass softening temperature was about 780 캜, and the thermal expansion coefficient from 25 to 500 캜 was 11 10 ^-6 / K.

The second composition for securing various thermal expansion coefficient sections from the combination of the first composition and the third composition includes 10 to 15 wt% of Li ₂ O, 5 to 9 wt% of P ₂ O _5, 5 to 10 wt% of K ₂ O, 0.1 to 1.5 wt% of Na ₂ O, 1.5 to 4.0 wt% of ZnO, 6 to 10 wt% of Al ₂ O ₃ , 0.5 to 2 wt% of CaO, 0.5 to 1.5 wt% of B ₂ O ₃ , and CeO ₂ , TiO ₂ , ZrO ₂ , Y ₂ O ₃ and the like are each contained within a range of 0.01 to 1.2% by weight and preferably contains 52.7 to 74.0% by weight of SiO ₂ .

The third composition is SiO ₂ 70 to 80% by weight of Li ₂ O, 20 to 30% by weight of Li ₂ O, 0.01 to 0.5% by weight of CaO, and 0.01 to 0.5% by weight of CeO 2.

In addition, the color composition may be selected from among oxides containing Zr Pr, oxides containing Kr and Cr, color pigment oxide groups containing Ti, Cr, and Sb, It is preferable that an oxide composed of Ce · Te is further included in a predetermined amount. It is preferable to exclude V2O5, WO3, and Co oxides which are used as color pigments because different colors are implemented in the process of forming them with glass raw materials and compounds.

The metal nitride is Si ₃ N ₄ , and it is preferable that the metal nitride is added in an amount of 5% by weight or less based on the total amount of the first to third compositions.

A preferred method of manufacturing a dental ceramic ingot according to the present invention comprises the steps of mixing and melting a composition of claim 1 or claim 5 according to the application, heating the mixture to a high temperature to obtain a molten composition; Passing the molten composition through a water-cooled alumina roll to obtain an amorphous flaky glass; Processing the amorphous flaky glass to a fine powder of 200 μm or less to obtain a powder raw material; Mixing a color raw material with a powder raw material to obtain a mixed raw material; Adding a binder to the mixed raw material and re-pulverizing the mixture to obtain a molding raw material; Heating at a temperature of 40 to 60 MPa or more to obtain a molded article, and degreasing the molded article to obtain a degreased molded article; and heat treating the degreased molded article to obtain a calcined article.

In addition, in the step of obtaining the degreased molded product, it is preferable that the temperature raising rate is 10 to 20 deg. C / min up to 600 deg. C and the degreased molded product is obtained within 2 hours by heating rate of 10 deg. . In addition, it is preferable that the degreased molded article is heated to 800 to 925 ° C at a temperature raising rate of 15 to 20 ° C / min and heat-treated within 5 minutes.

As a result of DSC thermal analysis of the ceramic powder, the nucleation and crystallization proceeded at about 548 ° C as the temperature increased, and the melting of the ceramic powder was found to be about 897 ° C.

As a result of the thermal expansion test for the second composition, the glass transition temperature was about 705 ° C, the glass softening temperature was about 835 ° C, and the thermal expansion coefficient from 25 ° C to 500 ° C was 8.0 × 10 ^-6 / K.

The third composition for controlling the transparency, the pressing temperature, the softening temperature and the thermal expansion coefficient of the first composition in the present invention is 70 to 80% by weight of SiO2, 20 to 30% by weight of Li2O, 0.01 to 0.5% by weight of CaO, 0.5% by weight.

FIG. 4 shows DSC thermal analysis results for the ceramic powder. As the temperature increases, the nucleation and crystallization proceed in the range of about 568 ° C., and the melting of the ceramic powder is found to be about 1039 ° C.

5 shows the results of the thermal expansion coefficient test for the third composition of the present invention. As a result of the thermal expansion test, the glass transition temperature of the third composition was about 810 캜, the glass softening temperature was about 957 캜, And the coefficient of thermal expansion was 11.5 × 10 ^-6 / K.

Table 1 shows the compositions and composition ratios of the raw materials for limiting composition in order to determine the optimum composition and compounding ratio. The first composition, the second composition and the composition for the third composition for securing stability in the thermal expansion coefficient and the softening temperature range And a stable color pigment was added in order to secure tooth esthetics. The raw materials of each composition were compounded as shown in <Table 1>.

Preparation of powder raw material samples and composition composition ratio division The first composition
(weight%) The second composition
(weight%) Third composition
(weight%) Composition Total
(weight%) Sample 1 40 30 30 100 Sample 2 50 25 25 100 Sample 3 60 15 25 100 Sample 4 60 20 20 100 Sample 5 60 25 15 100 Sample 6 50 25 25 100

The mixing conditions for each composition were 10 to 15 kg of alumina balls having a diameter of 5 to 20 in an alumina pot, charging the respective composition ratios (2 to 5 kg), and rotating speeds of 200 to 300 rpm for at least 2 hours Respectively.

The conditions of the sample 1 were as follows: the first composition was subjected to a crystallization heat treatment at 750 ° C for 3 hours, the second composition was subjected to a crystallization heat treatment at 780 ° C for 3 hours, and the third composition was a composition Wherein the ratio of the first composition, the second composition and the third composition is 4: 3: 3.

The conditions of sample 2 were as follows: the first composition was subjected to crystallization heat treatment at 750 ° C for 3 hours, the second composition was subjected to crystallization heat treatment at 780 ° C for 3 hours, and the third composition was a composition Wherein the ratio of the first composition, the second composition and the third composition is 5: 2.5: 2.5.

The conditions of the sample 3 were that the first composition, the second composition and the third composition were not subjected to heat treatment for crystallization, and were composed of 6 to 1.5 to 2.5 in powder form.

The conditions of the sample 4 are that the first composition, the second composition and the third composition are not heat treated for crystallization and are composed of 6 to 2 by 2 in powder form.

The conditions of the sample 5 were that the first composition, the second composition and the third composition were not subjected to heat treatment for crystallization, but were composed of 6 to 2.5 to 1.5 in powder form.

The condition of Sample 6 is the ingot after the conditions of Sample 2 were moored at a temperature of 920 占 폚 for 20 minutes at which the pressure casting was possible and cooled.

Figure 1. Test results of thermal expansion coefficient for sample 2

Figure 2. Thermal Expansion Coefficient Test Results for Sample 6

Table 2 summarizes the physical properties of six test samples. When Sample 2 is compared with Sample 6, the glass transition temperature is kept constant regardless of the presence or absence of melting, and the thermal expansion coefficient and softening temperature are slightly , Respectively.

 Property table for test sample division Coefficient of thermal expansion
(TCE, 10 &lt; ^-6 &gt; / K) Glass transition temperature
(Tg, ° C) Softening temperature
(Ts, 占 폚) Remarks Sample 1 10.2 714 824 Sample 2 10.3 733 826 Sample 3 11.1 534 813 Sample 4 10.7 528 791 Sample 5 10.5 514 802 Sample 6 10.9 733 843

[Application of color pigment]

The choice of color pigment is added to give the esthetics of the tooth. The yellow color is Si oxide containing (Zr, Pr), the red color is Si oxide containing (Kr, Cr), the gray color is (Zr, (Y, Ce, Te) to improve the transparency of the visible light from the tooth specific color by adjusting the color using oxides containing (Ti, Cr, Sb) A fluorescent pigment of the constituted oxide was used.

Depending on the type of each color, the color pigment may be yellow, red, gray and fluorescent in a range of 0.001 to 3% by weight to adjust the color of the teeth. The color of the teeth can be varied according to a certain ratio.

The color pigment is uniformly distributed, and the amount of the color pigment to be used is mixed with the powder of the first composition so that the intrinsic color can be exhibited at the heat treatment at a high temperature. In order to uniformly mix the different powders from the alumina pot- , And the powders are further subjected to a heat treatment at 750 ° C.

By performing the heat treatment, color pigments are uniformly dispersed in the process of crystallizing an element inherent in color, so that there is an advantage that the color of the ingot to be manufactured can be kept constant.

[powder Before molding Granular  Distribution]

Samples 2 were analyzed for particle size. As a result of the particle size analysis, it was found that most of the powders having a size of 10 μm or less were mostly mixed with powders having a size of 50 to 100 μm and some of them having a size of about 250 μm or less .

 [Application of powder molding]

The powder prepared from the conditions of the above-mentioned sample 2 was molded without the process of remelting, and the ingot was molded and fired.

First, the binder used in molding is mixed with an organic binder (an organic material to which an example of the present invention is added, polyvinyl alcohol and the like) at a maximum of 5% by weight or less, dried and then re-pulverized to produce an ingot, , The molding was performed under the condition of 40 MPa or more, but the process was inadequate at 60 MPa or more.

The degreasing process was performed at a temperature of 10 to 20 ° C / min up to 600 ° C and within 10 ° C at a temperature of 600 to 800 ° C, and the degreasing process was completed within 2 hours.

Figure 3 is a photograph of an ingot that was cooled to 925 ° C at a rate of 15 to 20 ° C / min, moored within 10 minutes, and air cooled. In the heating furnace, when the dwell time exceeds 10 minutes, melting proceeds and the shape of the ingot becomes unstable. Therefore, it is most preferable to moor at 920 ° C for 5 minutes.

<Figure 3> Photo of ingot shape

As described above, the first composition imparts a high-strength crystalline phase through the crystallization heat treatment while giving uniformity of the color pigment, while the second composition lowers the thermal expansion coefficient while maintaining the softening temperature, And the third composition has a capability of controlling the softening temperature and the melting temperature while controlling the transparency.

The ceramic ingot is prepared after the color pigment is added to the first composition and the second composition and the third composition are blended at a predetermined ratio and then subjected to molding and firing processes. As shown in the figure, It is also possible to manufacture ceramic ingots having various transparency and color depending on the amount of color pigment added.

<Figure 4> Ingot color photograph

Claims (9)

A first composition for imparting high strength properties and uniformity of a color pigment as a composition having a lithium disilicate crystal phase;
A second composition for lowering the thermal expansion coefficient and maintaining the softening temperature to secure various thermal expansion zones;
A third composition for controlling the softening temperature and the melting temperature while controlling the transparency;
A color composition for obtaining natural teeth;
Metal nitrides that increase the bonding strength between oxygen atoms and metals; And
A dental ceramic ingot using lithium disilicate containing the first to third compositions, the color composition, and the metal nitride in a predetermined composition ratio according to the application.
The method according to claim 1,
Wherein the first composition comprises 12 to 17 wt% of Li ₂ O, 5 to 9 wt% of P ₂ O ₅ , 0.5 to 2.5 wt% of K ₂ O 2, 0.5 to 2.5 wt% of Na ₂ O, 0.7 to 4.7 wt% of ZnO, ₂ O ₃ 3.5 ~ 6% by weight, and CaO 1 ~ 2 _{wt%, B 2 O 3 1 ~} 2% by weight, and CeO _2, TiO _2, ZrO _2, such as Y ₂ O ₃ is less than 0.01 wt% to approximately 1.5 wt%, respectively And SiO ₂ 48.4 to 72.0% by weight based on the total weight of the dental ceramic ingot.
The method according to claim 1,
Wherein the second composition comprises 10 to 15 wt% of Li ₂ O, 5 to 9 wt% of P ₂ O _5, 5 to 10 wt% of K ₂ O, 0.1 to 1.5 wt% of Na ₂ O, 1.5 to 4.0 wt% of ZnO, ₂ O ₃ 6 ~ 10% by weight, and CaO 0.5 ~ 2% by weight, B ₂ O ₃ 0.5 ~ 1.5 wt%, and _{CeO 2, TiO 2, ZrO 2} , Y 2 O 3 , etc. is within 0.01 ~ 1.2% by weight And 52.7 to 74.0% by weight of SiO _{2, based on the} total weight of the dental ceramic ingot.
The method according to claim 1,
The third composition is SiO ₂ Wherein the ceramic ingot comprises 70 to 80% by weight of Li ₂ O, 20 to 30% by weight of Li ₂ O, 0.01 to 0.5% by weight of CaO, and 0.01 to 0.5% by weight of CeO 2.
The method according to claim 1,
The color composition may be selected from the group consisting of oxides containing Zr Pr, oxides containing Kr and Cr, color pigment oxide groups containing Ti, Cr, and Sb, A ceramic dental ceramic ingot using lithium disilicate, characterized in that a predetermined amount of oxide composed of Te is further contained.
The method according to claim 1,
Wherein the metal nitride is Si ₃ N ₄ , and 5 wt% or less of the total amount of the first, second, and third compositions is added to the ceramic composition.
Claims: 1. A process for producing a molten composition, comprising the steps of: preparing a composition according to claim 1 or claim 5 by mixing, melting and heating at a high temperature;
Passing the molten composition through a water-cooled alumina roll to obtain an amorphous flaky glass;
Processing the amorphous flaky glass to a fine powder of 200 μm or less to obtain a powder raw material;
Mixing a color material to the powder material to obtain a mixed material;
Adding a binder to the mixed raw material and re-pulverizing the mixture to obtain a molding raw material;
Pressure side at a temperature of 40 to 60 MPa or more to obtain a molded article, and degreasing the molded article to obtain a degreased molded article,
And heat-treating the degreased molded product to obtain a fired product. The method for manufacturing a dental ceramic ingot using lithium disilicate according to claim 1,
The method of claim 7,
Wherein the degreasing step is carried out at a temperature raising rate of 10 to 20 ° C / min up to 600 ° C in the step of obtaining the degreased molded product, and the degreased molded product is obtained within a period of not more than 2 hours at a heating rate of 10 ° C / min in a range of 600 to 800 ° C Method for manufacturing dental ceramic ingot using lithium disilicate.
The method of claim 7,
Wherein the degreased molded product is heated to 800 to 925 ° C at a temperature raising rate of 15 to 20 ° C / min and heat-treated for 5 minutes or less.

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