KR102251422B1 - Fully sintered esthetic zirconia blocks for chair-side implant crowns - Google Patents

Abstract

The present invention is a completely sintered zirconia block in which an abutment and a crown are integrated by placing an opaque first zirconia solid solution corresponding to an abutment inside and a semi-transparent second zirconia solid solution corresponding to a crown on the outside. 1 Zirconia solid solution is formed in a composition of 89.8-91.0 mol% ZrO ₂ , 5.0-5.4 mol% Y ₂ O ₃ , 4.0-4.8 mol% Nb ₂ O ₅ or Ta ₂ O ₅ and 0.1-30 vol% of Al ₂ O ₃ In addition, the second zirconia solid solution is formed of 86.4-89.7 mol% ZrO ₂ , 5.5-7.4 mol% Y ₂ O ₃ , 4.8-6.2 mol% Nb ₂ O ₅ or Ta ₂ O ₅ composition, and Fe ₂ O ₃ , Er ₂ O ₃ , Pr ₆ O ₁₁ , TiO ₂ , Co ₂ O ₃ Provides a complete sintered zirconia block for same-day prosthetic implants, characterized in that an additive selected from 0.01 to 5.0 wt% is included. .

Description

{Fully sintered esthetic zirconia blocks for chair-side implant crowns}

The present invention relates to a zirconia block for an implant, and in detail, proposes a new completely sintered zirconia block in which a crown and an abutment are integrated with a heterogeneous zirconia solid solution.

The dental implant field has experienced remarkable growth so far. As an artificial tooth material that replaces natural teeth, metal has been mainly used in the past, but recently, ceramic prostheses capable of expressing a color similar to that of natural teeth have been widely used because of their excellent aesthetics.

The global implant market continues to grow and is expected to exceed $4 billion by 2020. One of the backgrounds for expanding the size of the implant market is that digital dentistry-based CAD/CAM (Computer Aided Design/Computer Aided Manufacturing) technology is widely distributed and the level of technology continues to develop. The advancement of CAD/CAM technology is expected to enable early surgical recovery by customizing implants according to the patient's oral anatomy and determining the exact placement of implants for less invasive surgery. In particular, digital dentistry-based implant surgery requires that the upper structure of the implant and the crown attached thereto be manufactured in real time by interlocking with the chair-side CAD/CAM aiming for a'same day' prosthesis.

Currently, chair-side CAD/CAM materials for tooth restoration are mainly made of feldspar ceramics or glass ceramics, which are easy to process, but due to the weak mechanical properties of these materials, restoration treatment such as natural tooth laminates or inlays rather than implants It is limited to the situation. On the other hand, zirconia has the advantage that it has high aesthetics because it is similar to the color of teeth, and has a very high strength, so that it can withstand the impact of breaking natural teeth. In particular, it is a human-friendly material and does not have an allergic reaction. However, in the case of zirconia material, it is still limited to be used for chair-side CAD/CAM prosthesis because the prosthesis must first be processed using semi-sintered zirconia and then additionally undergo a complete sintering process.

In order to use the zirconia material for the prosthesis on the same day, the prosthesis must be completed with only one processing, not a prosthesis manufacturing process that basically goes through the steps of semi-sintering, processing, and complete sintering. That is, there should be no additional sintering process after processing. The problem is that high-strength zirconia materials have difficulty in CAD/CAM processing for same-day prosthetics due to their high hardness in the state of sintering. In addition, the implant structure is usually divided into a fixture corresponding to an artificial tooth root, an abutment as an abutment, and a crown as the final restoration.After fixing the abutment to the fixture while the fixture is placed in the patient's jawbone, a crown is placed on it. Instead of the two-step procedure of restoring, it will be more effective for the same-day prosthesis to be performed with a material that combines the abutment and crown at once. To implement this, in the case of an implant for aesthetic purposes, the abutment must be opaque because not only the mechanical properties are required, but also the metal color of the titanium joint or fixture must be blocked. On the other hand, the crown must be semi-transparent to realize the tooth color. It should be light-transmitting.

According to Patent Registration No. 10-0912271, a crown-integrated abutment made of a ceramic material in which the crown and the abutment are integrally formed and a method of manufacturing the same have been proposed. This technology comprises the steps of manufacturing a first preliminary block body by processing a block made of a ceramic material such as zirconia, 3D modeling a tooth, a core part to be coupled to an implant fixture in the tooth 3D model and an outer part of the core. Modeling each porcelain part that forms the appearance of an artificial tooth at, forming a core part by processing and sintering a first preliminary block body using the core part model, and forming a porcelain part block body using the porcelain part model And forming a crown-integrated abutment by combining the core part and the porcelain part block body and injecting porcelain into the porcelain part block body.

It is mentioned that such a conventional crown-integrated abutment simplifies the structure of the abutment and can save time and cost by more than 50% compared to the existing method of combining the crown and the abutment after making each, but zirconia abutment (uh Buttment) is combined with the porcelain crown shell, and then porcelain is injected into the shell to complete the structure in which the porcelain crown and the zirconia abutment are combined.The abutment is processed after semi-sintering to complete the sintering process, making it a prosthesis material on the same day. There are still limitations to apply.

The present invention was created under the above-described technical background, and an object of the present invention is to provide a zirconia block for an aesthetic implant in which an abutment and a crown are integrated.

Another object of the present invention is to provide a new zirconia block capable of same-day prosthesis by processing in a complete sintered state instead of the existing zirconia block which is processed after semi-sintering and undergoes complete sintering.

Another object of the present invention is to provide a completely sintered zirconia block in which heterogeneous materials are integrated so that the abutment has high strength and opacity, while the crown has high workability and translucency as a zirconia block for implants.

In addition, other objects and technical features of the present invention will be presented in more detail in the detailed description below.

In order to achieve the above object, the present invention provides an opaque first zirconia solid solution corresponding to the abutment inside, and a semi-transparent second zirconia corresponding to the crown on the outside, so that the abutment and the crown are integrated. As a zirconia block, the first zirconia solid solution is 89.8-91.0 mol% ZrO ₂ , 5.0-5.4 mol% Y ₂ O ₃ , 4.0-4.8 mol% Nb ₂ O ₅ or Ta ₂ O _{5 It} is formed in a composition of 0.1-30 vol % Of Al ₂ O ₃ is additionally included, and the second zirconia solid solution is 86.4-89.7 mol% ZrO ₂ , 5.5-7.4 mol% Y ₂ O ₃ , 4.8-6.2 mol% Nb ₂ O ₅ or Ta ₂ O ₅ The same-day prosthesis for esthetic implants, characterized in that it contains an additive selected from the composition of Fe ₂ O ₃ , Er ₂ O ₃ , Pr ₆ O ₁₁ , TiO ₂ , and Co ₂ O _{3 in the range of 0.01-5.0 wt%} Provides a block of zirconia.

In the present invention, the zirconia block may be obtained by sintering for 1 to 5 hours at a temperature in the range of 1400 to 1700°C under atmospheric pressure. In addition, in the present invention, the zirconia block may be cooled after atmospheric pressure sintering and then further sintered for 1 to 3 hours under a pressure of 5000 to 30,000 psi at a temperature of 1400 to 1600°C.

In the zirconia block of the present invention, the abutment may be disposed from the top to the bottom of the block while being located inside the crown, and a bolt insertion hole for fixing the fixture may be formed inside the abutment.

The present invention is also 89.8-91.0 mol% ZrO ₂ , 5.0-5.4 mol% Y ₂ O ₃ , 4.0-4.8 mol% Nb ₂ O ₅ or Ta ₂ O ₅ and the composition of the first zirconia and 0.1-30 vol% of Al ₂ O ₃ opaque abutment block formed by further including; And 86.4-89.7 mol% ZrO ₂ , 5.5-7.4 mol% Y ₂ O ₃ , 4.8-6.2 mol% Nb ₂ O ₅ or Ta ₂ O ₅ composition of the second zirconia and Fe ₂ O ₃ , Er ₂ O ₃ , Pr ₆ O ₁₁ , TiO ₂ , Co ₂ O ₃ is formed to include an additive selected from 0.01-5.0 wt% in the range of, and is formed with a translucent crown block having an insertion space therein; consisting of, and the abutment block After each of the crown blocks is sintered, there is provided a same-day prosthetic complete sintered zirconia block for esthetic implants, characterized in that the abutment block is combined and integrated into the inner insertion space of the crown block.

According to the present invention, there is provided a complete sintered zirconia block for same-day prosthetics for esthetic implants in which an abutment of a heterogeneous composition and a crown are integrated.

The zirconia block of the present invention has low hardness and high toughness in the case of a crown block, so that the processability of the crown is excellent, so that CAD/CAM processing is possible in a short time. On the other hand, the abutment block is excellent in physical properties such as strength and toughness, and thus physically stable attachment to the metal fixture is possible. In addition, the abutment block completely blocks the metallic color of the internal metal fixture due to its opacity, and the overall aesthetics of the implant restoration is excellent due to the translucent or translucent properties of the crown attached thereto.

The complete sintered zirconia double block of the present invention can simultaneously replace each semi-sintered zirconia block and titanium for abutment used in the existing dental hospital.

In the case of semi-sintered zirconia, more than one day is required for the sintering and coloring process after processing, and the block for feldspar abutment has excellent workability, but it requires a heat treatment process for crystallization of more than 1 hour after processing, and is integrated with low mechanical properties. There is a problem with the application of the block. On the other hand, the complete sintered zirconia block in which the crown and the abutment are integrated can be manufactured only in about 30 minutes, so that same-day prosthetics are possible with a dramatic reduction in manufacturing time, thereby reducing cost and time, and worldwide. It is expected to create great demand in the implant market.

1 shows Y ₂ O ₃ and Nb ₂ O ₅ Graph showing the change in the strength of zirconia according to the addition
2 shows Y ₂ O ₃ and Nb ₂ O ₅ Graph showing fracture toughness of zirconia according to addition
3 shows Y ₂ O ₃ and Nb ₂ O ₅ Graph showing the change in hardness of zirconia according to the addition
4 shows Y ₂ O ₃ and Ta ₂ O ₅ Graph showing the change in strength of zirconia block with addition
5 shows Y ₂ O ₃ and Ta ₂ O ₅ Graph showing fracture toughness of zirconia according to addition
6 shows Y ₂ O ₃ and Ta ₂ O ₅ Graph showing the change in hardness of zirconia according to the addition
7 is Al ₂ O ₃ Graph showing the change in the strength of zirconia according to the addition
8 is Al ₂ O ₃ Graph showing fracture toughness of zirconia according to addition
9A to 9D are schematic diagrams showing a molding process and a molded article of the zirconia block of the present invention
10 is a graph showing the particle size change of zirconia powder according to the addition of alumina
11 is a graph showing a change in intensity of zirconia according to HIP temperature
12a and 12b are SEM photographs of zirconia after atmospheric pressure sintering and HIP treatment

The present invention proposes a complete sintered zirconia block for same-day prosthetics for aesthetic implants in which an abutment of a heterogeneous composition and a crown are integrated.

_{Unlike conventional implant procedures that use Y 2} O ₃ added stabilized semi-sintered zirconia (Y-TZP) blocks and metal abutments, which are used as a material for crowns in implant structures, same-day prosthetics suitable for the era of digital dentistry are implemented. To do this, a new paradigm of zirconia blocks is required.

The aesthetically sintered zirconia block in which the crown and the abutment are integrated can complete the implant restoration without subsequent sintering with only one processing. Completely sintered zirconia blocks for these implants for abutments Zirconia is required to have high strength, and zirconia for crowns must have excellent workability even in a completely sintered state. In addition, due to the characteristics of dental implants that emphasize aesthetics, the abutment must be opaque because it must block not only the mechanical properties but also the metal color of the connection part or fixture made of titanium. Translucency is required.

In this way, in order to satisfy the properties of each of the crown and the abutment while being integrated, the present invention specializes the composition of each of the different types of zirconia, and controls the sintering process so that it is molded to suit the implant structure and maintains the physical properties of each part.

According to the oxide solid solution content Zirconia Physical property change

In the present invention, in order to manufacture a block for an aesthetic implant in which heterogeneous materials are integrated, a material obtained by dissolving ZrO ₂ in different compositions of trivalent oxide and pentavalent oxide is used. Specifically, the present invention is based on a ternary zirconia solid solution of _{ZrO 2} -Y ₂ O ₃ -Nb (or Ta) ₂ O ₅ so that the abutment and the crown are each implemented with different types of zirconia materials _{, while Y 2} O ₃ and By adjusting the amount of Nb (or Ta) ₂ O ₅ added, the strength, toughness, hardness, and transmittance of the abutment and crown are adjusted differently. The zirconia solid solution of high strength/opaque composition is placed inside the block for abutment, and the zirconia solid solution of high toughness/translucent composition is placed outside the block for crown, thereby securing the mechanical properties and aesthetics of the entire implant structure at the same time.

As the solid solution _{content of trivalent oxide in ZrO 2} increases, fracture toughness and modulus generally decrease, and hardness and transmittance increase. On the other hand, the increase of the pentavalent oxide tends to decrease the fracture toughness, hardness, modulus of elasticity, and transmittance. The influence of these oxides on the strength increases in proportion to the addition amount of each oxide without a certain tendency and shows a maximum value and then decreases.

1 to 3 are results of evaluating the mechanical properties of the zirconia block according to the amount of _{Y 2} O ₃ and Nb ₂ O _{5 added.} When Nb ₂ O ₅ is added, the maximum strength of the block is 800 MPa, but this is a lower value than the existing 3Y-TZP, and about 500 MPa when 5.5 mol% Y ₂ O ₃ and 4.9 mol% Nb ₂ O _{5 are added to ZrO 2} Decreased sharply. If the highest toughness of the block was measured to 10 MPa and m ^1/2, this case was superior to 6 MPa m ^1/2 and of 3Y-TZP.

The hardness showed a distribution of 9-10.5 GPa, decreased as the addition amount of _{Nb 2} O _{5 increased, and Y 2} O ₃ was observed to be proportional to the addition amount. These hardness values were lower than the 12 GPa of 3Y-TZP, and the workability of these specimens was superior to that of 3Y-TZP.

4 to 6 are Y ₂ O ₃ and Ta ₂ O ₅ This is the result of evaluating the mechanical properties of the specimens with different amounts added. As the _{amount of Ta 2} O ₅ increased, the mechanical properties of the sintered body _{showed a similar tendency to that of Nb 2} O ₅ , resulting in decreased strength and increased toughness. However, in _{the specimen to which Ta 2} O ₅ was added, the fracture toughness showed a rapid change and improved ^{from 5.5 MPa·m 1/2} to a maximum of 8.2 MPa·m ^1/2. The maximum hardness was 11 GPa, and the maximum value was higher than that _{of Nb 2} O _5.

It can be seen that the change in strength, toughness, and hardness according to the composition change is not linear and tends to decrease after reaching the maximum value. Based on these characteristics, the present invention determined the composition range of zirconia for the crown.

It is known that the addition of alumina to zirconia increases the strength and toughness. Alumina is dissolved in zirconia in a very small amount and mostly exists as a secondary phase, so when fracture occurs due to external stress, alumina particles in the secondary phase block the transition of cracks, causing an increase in strength. The composite powder obtained by adding alumina in a volume ratio to the zirconia powder was biaxially pressurized and CIPed, and then sintered at 1600° C. for 2 hours to show changes in physical properties according to the amount of addition. The strength according to the amount of alumina added was the highest at 40 vol% and 60 vol%, and the fracture toughness was the highest at 80 vol%.

In the present invention, commercial alumina is added to the zirconia powder for abutment to change the physical properties and transmittance, while controlling the sintering behavior as described later.

Complete sintering Zirconia Composition of blocks

Considering the effect of added oxides on _{the physical properties of the ZrO 2} solid solution, the first zirconia solid solution for abutment was 89.8-91.0 mol% ZrO ₂ , 5.0-5.4 mol% Y ₂ O ₃ , 4.0-4.8 mol% Nb ₂ O ₅ (or Ta ₂ O ₅ ). In addition, the second zirconia solid solution for the crown has a composition of 86.4-89.7 mol% ZrO ₂ , 5.5-7.4 mol% Y ₂ O ₃ , 4.8-6.2 mol% Nb ₂ O ₅ (or Ta ₂ O ₅ ).

The first zirconia solid solution and the second zirconia solid solution each have the same component, and the amounts of the trivalent oxide and the pentavalent oxide are different to secure physical properties suitable for the conditions of the implant abutment and the crown. In addition, by not increasing the difference in the amount of trivalent oxide and pentavalent oxide added in the first zirconia solid solution and the second zirconia solid solution, the difference in sintering behavior between heterogeneous compositions in the sintering process can be minimized and the quality of the final sintered block can be improved. have.

The finished esthetic zirconia heterojunction block naturally matches the surrounding teeth when installed in the oral cavity through processing, while other components may be further included in each solid solution so that the color of the internal metal fixture is not exposed to the outside. The first zirconia solid solution contains 0.1-30 vol% of Al ₂ O ₃ to ensure opacity, and the second zirconia solid solution is Fe ₂ O ₃ , Er ₂ O ₃ , Pr ₆ O ₁₁ , TiO ₂ , By including _{an additive selected from Co 2} O ₃ in the range of 0.01-5.0 wt%, the color is given so that the crown is close to the natural tooth. When manufacturing an implant block, the amount of additives for the second zirconia solid solution for the crown may be controlled to gradually decrease the transmittance from the top to the bottom of the block for optimization of aesthetics.

In order to check whether the zirconia solid solution with different compositions can be used as an integrated structure as an abutment for an implant and a crown, 90.6 mol% ZrO ₂ , 5.3 mol% Y ₂ O ₃ , 4.1 mol% as zirconia for an abutment Nb ₂ O ₅ , a composition was prepared, and a block was prepared by further including _{20 vol% of Al 2} O _3. In addition, as zirconia for the crown, 89.7 mol% ZrO ₂ , 5.5 mol% Y ₂ O ₃ -4.8 mol% Nb ₂ O _{5 A} composition was prepared to prepare a block. Table 1 shows the results of measuring the physical properties of each manufactured block.

Abutment Crown burglar 1067 MPa 740 MPa Fracture toughness 10.01 MPam^1/2 7.9 MPam^1/2 Hardness 10.2 GPa 8.4 GPa Transmittance - 43%

The abutment has excellent mechanical properties with relatively high strength, fracture toughness, and hardness, _{and shows opacity by adding Al 2} O ₃ , while the crown is easy to process due to its relatively low hardness and has a transmittance of 43%. Is showing.

From the result of the physical properties obtained by varying the composition as described above, a zirconia material of a composition with excellent fracture toughness and low hardness, which is easy to process even in the state of complete sintering, and has a light-transmitting composition, is placed on the outer periphery and used as a crown, and the function and life of the crown are secured. It can be seen that a zirconia material having a composition having high strength and toughness but not light-transmitting can be used as an abutment by placing it inside the implant fixture.

Dual structure for implants Zirconia Block molding

In order to manufacture a zirconia block for implants having a dual structure by integrating heterogeneous zirconia materials with different compositions, a molding method different from the zirconia block having a single composition such as the conventional 3Y-TZP is required.

The first opaque zirconia solid solution corresponding to the abutment is located inside the block, and the second semitransparent zirconia solid solution corresponding to the crown is disposed outside the block to manufacture a block in which the abutment and the crown are integrated. The implant abutment material and the outer crown material are used for two-step molding. For example, by placing a separate cylinder or a similar mold for the injection of powder for abutment in the center of the mold for crown, first insert the powder for abutment, and then insert the powder for crown to the outside, and then open the inner mold. In the removed state, a molded body can be obtained by applying pressure. 9A to 9D are schematic diagrams showing a molding process and a molded article of an exemplary zirconia block.

9A, a first mold 110 for abutment is inserted into the upper groove of the molding base 10, and a second mold for crown 120 is placed on the molding base so as to be spaced apart from the outer circumference of the first mold. Insert. The first mold is formed of a cylindrical material having an empty interior and a diameter of 3 to 12 mm. The second mold may be formed as a cylindrical structure with an empty inside, and if necessary, the inside may be formed in a rectangular column structure. In a state in which the two molds are coupled to the molding base, zirconia powder for abutment is filled inside the first mold, and zirconia powder for crown is filled inside the second mold outside the first mold. After filling all the powder, the first mold is removed. While inserting the pressure punch 20 from the top of the second mold into the inside, pressure is applied to the molding base and the powder for abutment and the crown powder filled in the second mold.

After removing the pressing punch and separating the second mold from the molding base, a double-structured molded body in which the abutment (A) is disposed inside and the crown (C) is integrated on the outer surface thereof is completed (FIG. 9B). Depending on the inner structure of the second mold for the crown, the outer shape of the molded body may be formed to be a hexahedron (see FIG. 9C). In the zirconia block, the abutment may be placed inside the crown and disposed from the top to the bottom of the block.

In addition, by changing the shape of the first mold for the abutment, the bolt insertion hole h for fixing the fixture may be formed inside the abutment of the double structure zirconia block. In consideration of the convenience of molding, the insertion hole is formed inside the abutment at a height of about 80 to 90% of the total height of the abutment, and the sintered zirconia block is placed at the point where the abutment insertion hole is exposed (t It is also possible to cut through processing up to ).

Unlike the double molding method described above, 86.4-89.7 mol% ZrO ₂ , 5.5-7.4 mol% Y ₂ O ₃ , 4.8-6.2 mol% Nb ₂ O ₅ ( Or Ta ₂ O ₅ ) in the composition of Fe ₂ O ₃ , Er ₂ O ₃ , Pr ₆ O ₁₁ , TiO ₂ , Co ₂ O _{3 In} the range of 0.01-5.0 wt% of an additive selected from the crown block and the interior of the crown 89.8-91.0 mol% ZrO ₂ , 5.0-5.4 mol% Y ₂ O ₃ , 4.0-4.8 mol% Nb ₂ O ₅ (or Ta ₂ O ₅ ) 0.1-30 vol% Al _{Each block for an opaque abutment formed by additionally including 2} O ₃ is formed, individually sintered, and then the two blocks are combined with dental cement to form an integrated, completely sintered zirconia block as shown in FIG. 9B. Can also be completed. Zirconia blocks manufactured through individual shaping and sintering steps can be implanted on the same day without additional sintering and only one-time processing.

Double material Zirconia Block sintering

In order to complete the double-structured zirconia block for implants, a process of completing sintering by heat treatment under the same conditions for different materials other than the above-described double molding is required. The inventors of the present invention confirmed that the optimal sintering temperature condition in consideration of the strength, transparency and workability of the crown material through a study on dental zirconia is 1450 ~ 1700 ℃, and in the case of zirconia for abutment is 1400-1450 ℃. There is a bar.

Since the sintering temperature of the crown material and the abutment material are different, in order to manufacture a double-structured zirconia block, the sintering temperature of the abutment material is matched with the sintering temperature of the crown material. It is important to develop. The composition is adjusted to minimize the difference in the coefficient of thermal expansion of the different materials, while optimization of the sintering atmosphere, the heating rate, and the holding time is also required.

In the present invention, the molded double-structured zirconia block is sintered under atmospheric pressure at a temperature in the range of 1400 to 1700° C. for 1 to 5 hours (atmospheric pressure sintering). In addition to making the difference between the composition of zirconia for crown (second zirconia solid solution) and zirconia for abutment (first zirconia solid solution) not large, Al ₂ O _{3 for abutment} In addition to controlling the transmittance (opacity) by adding in the range of 0.1 to 30 vol% of the zirconia composition of the abutment, the problem of sintering behavior due to the difference in the thermal expansion coefficient between the zirconia composition for the crown and the zirconia composition for the abutment was solved. It can be solved. FIG. 10 shows the change in the particle size of zirconia according to the alumina content, and it can be seen that the difference in thermal expansion between the abutment and the crown material can be controlled by controlling the particle size by controlling the alumina content in the abutment powder.

Even in the case of manufacturing an integrated zirconia block by bonding the abutment to the inner space of the crown after each molding the crown and the abutment, the molded crown and the abutment were simultaneously sintered under the above-described sintering conditions. By combining the sintered body, an integrated zirconia block can be completed. In addition, it is also possible to sinter the individually molded crown block and abutment block under different conditions, and then combine the two blocks with dental cement and integrate them.

The zirconia block of the present invention may be further sintered for 1 to 3 hours under pressure of 5000 to 30,000 psi at a temperature of 1400 to 1600°C to improve physical properties if necessary after atmospheric pressure sintering (high temperature pressurization sintering). :HIP).

The effect of the HIP treatment on the strength of the abutment composite is shown in FIG. 11. The biaxial strength of the sintered body before HIP was 751 MPa, but it can be seen that it increased to 824 MPa by HIP treatment at ^{1500 o C.} This increase in strength is due to the decrease in porosity caused by the HIP treatment of the atmospheric pressure sintered body, as can be seen from the SEM photographs of FIGS. 12A and 12B. It can be seen that the difference in the electron absorption coefficient does not affect the size of the particle diameter of _{Al 2} O _{3 shown in black.}

Although the present invention has been exemplarily described above through preferred embodiments, the present invention is not limited to such specific embodiments, and the technical idea presented in the present invention, specifically, various forms within the scope described in the claims. It may be modified, changed, or improved.

10: Molding base 20: Press punch
110: first mold 120: second mold

Claims (9)

It is a completely sintered zirconia block in which the abutment and the crown are integrated by arranging the opaque first zirconia solid solution corresponding to the abutment inside and the translucent second zirconia solid solution corresponding to the crown outside.
The first zirconia solid solution is formed in a composition of 89.8-91.0 mol% ZrO ₂ , 5.0-5.4 mol% Y ₂ O ₃ , 4.0-4.8 mol% Nb ₂ O ₅ or Ta ₂ O ₅ , and 0.1-30 vol% of Al ₂ O ₃ is additionally included,
The second zirconia solid solution is formed in a composition of 86.4-89.7 mol% ZrO ₂ , 5.5-7.4 mol% Y ₂ O ₃ , 4.8-6.2 mol% Nb ₂ O ₅ or Ta ₂ O ₅ , Fe ₂ O ₃ , Er ₂ An additive selected from O3, Pr ₆ O ₁₁ , TiO ₂ , Co ₂ O ₃ is included in the range of 0.01-5.0 wt%,
The zirconia block is obtained by sintering for 1 to 5 hours at a temperature in the range of 1400 to 1700°C under atmospheric pressure.
delete The method of claim 1,
The zirconia block is obtained by performing an additional sintering for 1 to 3 hours under a pressure of 5000 to 30,000 psi at a temperature of 1400-1600 °C and then cooling after atmospheric pressure sintering.
The method of claim 1,
In the zirconia block, the abutment is located inside the crown and is disposed from the top to the bottom of the block, and a bolt insertion hole for fixing the fixture is formed inside the abutment.
delete Forming a powder compact having a double structure consisting of an inner first zirconia powder compact for an abutment and an external second zirconia powder compact for a crown; And
Aesthetics comprising the step of sintering the double-structured powder compact to obtain a double-structured zirconia block in which the inner first zirconia solid solution corresponding to the abutment and the external second zirconia solid solution corresponding to the crown are integrated. Same-day prosthetic complete sintered zirconia block manufacturing method for implants.
The method of claim 6,
The first zirconia solid solution is formed in a composition of 89.8-91.0 mol% ZrO ₂ , 5.0-5.4 mol% Y ₂ O ₃ , 4.0-4.8 mol% Nb ₂ O ₅ or Ta ₂ O ₅ , and 0.1-30 vol% of Al ₂ O ₃ is additionally included,
The second zirconia solid solution is formed in a composition of 86.4-89.7 mol% ZrO ₂ , 5.5-7.4 mol% Y ₂ O ₃ , 4.8-6.2 mol% Nb ₂ O ₅ or Ta ₂ O ₅ , Fe ₂ O ₃ , Er ₂ O ₃ , Pr ₆ O ₁₁ , TiO ₂ , Co ₂ O _{3 A} method for producing a complete sintered zirconia block for same-day prosthetics for aesthetic implants comprising an additive selected from 0.01-5.0 wt%.
The method of claim 6,
The sintering is performed for 1 to 5 hours at a temperature in the range of 1400-1700 °C under atmospheric pressure.
The method of claim 6,
After the step of sintering the double-structured powder compact, cooling the zirconia block and then sintering the zirconia block at a temperature of 1400-1600 °C under a pressure of 5000-30,000 psi for 1-3 hours. A method of manufacturing a zirconia block with complete sintering of prosthetics.

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