JP6584766B2 - Zirconia sintered body and dental product - Google Patents

Description

  The present invention relates to a zirconia sintered body containing a colorant. The present invention also relates to a dental product using the zirconia sintered body.

  Partially stabilized zirconia to which a stabilizer for suppressing phase transition is added is a ceramic having excellent properties such as high strength and high toughness. Partially stabilized zirconia sintered bodies are used in various applications such as prosthetic materials and tools used for dental treatment. Therefore, zirconia having various colors has been developed to enhance aesthetics. For example, pink zirconia sintered bodies (for example, see Patent Document 1), orange zirconia sintered bodies (for example, see Patent Document 2), purple zirconia sintered bodies (for example, see Patent Document 3), and the like are known.

JP 2011-20875 A JP 2011-20872 A JP 2011-20877 A

  The following analysis is given from the perspective of the present invention.

  As dental prosthetic materials using a zirconia sintered body, there are a Full Contour Zirconia Crown and a Porcelain Fused to Zirconia.

  A full cantour zirconia crown forms a covering crown only with a zirconia sintered body, and the surface of the zirconia sintered body is exposed as a surface of an artificial tooth. An uncolored zirconia sintered body is usually white. However, normal natural teeth are yellowish and reddish. Therefore, if a non-colored zirconia sintered body is used as a full cantour zirconia crown, the treated patient's teeth will have an unnatural whiteness. Therefore, it is desired to reproduce the same color as natural teeth with the zirconia sintered body itself.

  On the other hand, the porcelain baked zirconia crown is obtained by building and baking porcelain such as colored glass on the frame of a zirconia sintered body in order to reproduce the appearance of natural teeth. When the zirconia sintered body has a color different from that of natural teeth, it is necessary to build up porcelain on the entire exposed surface. However, in order to more precisely match the patient's tooth shape, it is desirable to reduce the build-up area and build-up amount of the porcelain. Therefore, also in this case, it is desired that the zirconia sintered body itself has a color similar to that of natural teeth.

According to the first aspect of the present invention, there is provided a zirconia sintered body in which L ^* is 64 to 76, a ^* is −6 to 3, and b ^* is 3 to 27 in the L ^* a ^* b ^* color system. The Zirconia sintered body is composed of erbium oxide, nickel oxide, zirconium and vanadium composite oxide, iron, cobalt and chromium composite oxide, zirconium and silicon composite oxide, silicon dioxide, and zirconium, silicon, cobalt and nickel. Containing at least one colorant selected from the group comprising complex oxides.
As a modification of the first aspect, the zirconia sintered body has an L ^* a ^* b ^* color system in which L ^* is less than 64 to 70 , a ^* is −6 to 3, and b ^* is 3 to 27. Erbium, nickel oxide, zirconium and vanadium composite oxides, iron, cobalt and chromium composite oxides, zirconium and silicon composite oxides, silicon dioxide, and zirconium, silicon, cobalt and nickel composite oxides At least one colorant selected from the group consisting of, and at least the colorant of the complex oxide of zirconium and vanadium.
As another modification of the first aspect, the zirconia sintered body has an L ^* a ^* b ^* color system of L ^* of 64 to 76, a ^* of −6 to 3, and b ^{* of 3} to 27, Includes composite oxides of erbium oxide, nickel oxide, zirconium and vanadium, composite oxides of iron, cobalt and chromium, composite oxides of zirconium and silicon, silicon dioxide, and composite oxides of zirconium, silicon, cobalt and nickel Containing at least one colorant selected from the group, containing at least the colorant of the composite oxide of zirconium and vanadium, more than 0% by weight of the colorant of the composite oxide of zirconium and vanadium, and Contains less than 0.01% by weight.

  According to the 2nd viewpoint of this invention, a dental product provided with the zirconia sintered compact concerning a 1st viewpoint is provided.

  A zirconia sintered body having a color similar to that of natural teeth can be obtained.

  The preferable form of each said viewpoint is described below.

  According to a preferred embodiment of the first aspect, the zirconia sintered body has a colorant A: erbium oxide, a colorant B: nickel oxide, a colorant C: a composite oxide of zirconium and vanadium, a colorant D: iron, cobalt. And a composite oxide of chromium, a composite oxide of zirconium and silicon, a mixture of silicon dioxide and nickel oxide, and a colorant E: at least one selected from the group comprising composite oxides of zirconium, silicon, cobalt and nickel Contains a colorant.

According to the preferable form of the first aspect, the zirconia sintered body contains 0% by mass to 0.5% by mass of the colorant A, 0% by mass to 0.06% by mass of the colorant B, and 0% of the colorant C. Containing 0% by mass to 0.2% by mass of Colorant D, 0% by mass to 0.2% by mass of Colorant D, and 0% by mass to 0.1% by mass of Colorant E,
Among the colorant A, the colorant B, the colorant C, the colorant D, and the colorant E, at least two colorants are contained.

According to a preferred mode of the first ^aspect, L ^* a * ^{b *} is ^{L *} is 66 to 69 in the color system, ^{a *} is 0 to 3, ^{b *} is 21 to 27.

  According to a preferred embodiment of the first aspect, the zirconia sintered body contains 0.1% by mass to 0.5% by mass of the colorant A, 0.01% by mass to 0.04% by mass of the colorant B, and It contains 0.05 to 0.2% by mass of the colorant C.

According to a preferred mode of the first ^aspect, L ^* a * ^{b *} is ^{L *} is 70 to 74 in the color system, ^{a *} is -6~0, ^{b *} is 18 to 26.

  According to a preferred embodiment of the first aspect, the zirconia sintered body contains 0% by mass to 0.3% by mass of the colorant A, 0.005% by mass to 0.03% by mass of the colorant B, and the colorant. It contains 0.03 to 0.09 mass% of C.

According to a preferred mode of the first ^aspect, L ^* a * ^{b *} is ^{L *} is 75 to 76 in the color system, ^{a *} is -3 to-1, ^{b *} is 3 to 6.

  According to a preferred embodiment of the first aspect, the zirconia sintered body has a colorant A of 0.002% by mass to 0.005% by mass, a colorant B of 0.0001% by mass to 0.0006% by mass, and It contains 0.006 to 0.02 mass% of the colorant C.

According to a preferred mode of the first ^aspect, L ^* a * ^{b *} is ^{L *} is 64 to 75 in the color system, ^{a *} is -2~3, ^{b *} is 7-19.

  According to the preferred embodiment of the first aspect, the zirconia sintered body contains at least one colorant among the colorant A, the colorant B, and the colorant C. The zirconia sintered body contains at least one colorant among the colorant D and the colorant E. The zirconia sintered body contains 0% by mass to 0.4% by mass of colorant A, 0% by mass to 0.06% by mass of colorant B, 0% by mass to 0.09% by mass of colorant C, and colorant. D is contained in an amount of 0% by mass to 0.2% by mass, and a coloring agent E is contained in an amount of 0% by mass to 0.1% by mass.

According to a preferred mode of the first ^aspect, L ^* a * ^{b *} is ^{L *} is 70 to 73 in the color system, ^{a *} is -2~1, ^{b *} is 11 to 17.

  According to a preferred embodiment of the first aspect, the zirconia sintered body has a coloring agent A of 0.5 mass% to 0.2 mass%, a coloring agent B of 0.007 mass% to 0.07 mass%, and coloring. The agent C contains 0.01% by mass to 0.04% by mass, and the colorant D contains 0.004% by mass to 0.02% by mass.

  The zirconia sintered body according to the first embodiment of the present invention will be described. The zirconia sintered body of the present invention is a sintered body in which partially stabilized zirconia crystal particles are mainly sintered, and has partially stabilized zirconia as a matrix phase. In the zirconia sintered body of the present invention, the main crystal phase of zirconia is at least one of a tetragonal system and a cubic system. Zirconia may contain both tetragonal and cubic systems. It is preferable that the zirconia sintered body does not substantially contain a monoclinic system in a stage where the hydrothermal treatment test is not performed.

  The zirconia sintered body of the present invention includes not only a sintered body obtained by sintering molded zirconia particles under normal pressure or non-pressurization, but also HIP (Hot Isostatic Pressing) treatment, etc. A sintered body densified by high-temperature pressure treatment is also included.

  The zirconia sintered body of the present invention contains zirconium oxide (zirconia), a stabilizer thereof, and a colorant. The zirconia sintered body may contain other additives. Examples of the additive include titanium oxide, aluminum oxide, silicon dioxide and the like.

Examples of the stabilizer in partially stabilized zirconia include calcium oxide (CaO), magnesium oxide (MgO), yttrium oxide (Y ₂ O ₃ ) (hereinafter referred to as “yttria”), cerium oxide (CeO ₂ ), and the like. The oxide of these is mentioned. When using the coloring agent mentioned later, it is more preferable to use yttria. The stabilizer is preferably added in such an amount that the zirconia can be partially stabilized. For example, when yttrium oxide is used as a stabilizer, the content of yttrium oxide can be preferably 2 to 7 mol% with respect to the partially stabilized zirconium oxide in the entire zirconia sintered body. The content of the stabilizer in the zirconia sintered body can be measured by, for example, inductively coupled plasma (ICP) emission spectroscopy, fluorescent X-ray analysis, or the like. Note that zirconia partially stabilized by adding a stabilizer is called partially stabilized zirconia (PSZ).

Zirconia sintered body according to the first ^{embodiment, L * a * b * L} * in the color system is 64-76, ^{a *} is -6～3 and ^{b *} is a 3-27 preferred. The zirconia sintered body having such chromaticity can have a color like natural teeth.

In the present disclosure, the chromaticity (L ^* , a ^* , b ^* ) according to the L ^* a ^* b ^* color system is a numerical value measured by preparing a sample and making the background black as in the examples described later. is there.

  Next, the composition and calcined body for producing the zirconia sintered body of the present invention will be described. The composition and the calcined body serve as a precursor (intermediate product) of the above-described zirconia sintered body of the present invention. The calcined body is obtained by firing (that is, calcining) the composition at a temperature that does not lead to sintering. In addition, the calcined body includes a molded product. For example, a dental product (for example, a crown-shaped prosthesis) obtained by processing a calcined zirconia disk with a CAD / CAM (Computer-Aided Design / Computer-Aided Manufacturing) system is also included in the calcined body.

  The composition and the calcined body contain zirconia crystal particles, a stabilizer, and a colorant (pigment). The composition and the calcined body may contain other additives. Examples of the additive include titanium oxide, aluminum oxide, silicon dioxide and the like.

Examples of the stabilizer in the composition and calcined body include oxides such as calcium oxide (CaO), magnesium oxide (MgO), yttria, and cerium oxide (CeO ₂ ). The stabilizer is preferably added in such an amount that the tetragonal zirconia particles can be partially stabilized. For example, when using yttria as a stabilizer, the yttria content is preferably 2 mol% to 7 mol% with respect to the total number of moles of zirconia and yttria.

  The composition of the present invention includes a powder, a fluid obtained by adding the powder to a solvent, and a molded body obtained by molding the powder into a predetermined shape. That is, the composition may be in the form of a powder, or a paste or a wet composition (that is, it may be in a solvent or may contain a solvent). The composition may contain additives such as a binder and a pigment. In addition, in the calculation of the content rate, the mass of additives such as a solvent and a binder is not considered.

  When the composition of the present invention is a molded body, it may be molded by any molding method, and may be molded by, for example, press molding, injection molding, stereolithography, or multistage. It may be molded. For example, the composition of the present invention may be subjected to press molding and further subjected to CIP (Cold Isostatic Pressing) treatment.

  The calcined body of the present invention can be obtained by firing the composition of the present invention at 800 ° C. to 1200 ° C. under normal pressure.

  The calcined body of the present invention becomes the zirconia sintered body of the present invention by firing at 1350 ° C. to 1600 ° C. under normal pressure.

The zirconia sintered body, composition and calcined body in the present invention can contain at least one of a metal oxide and a commercially available colorant as a coloring component. Examples of the zirconia sintered body, composition, and calcined body having the chromaticity as described above include erbium oxide (Er ₂ O ₃ ); iron oxide (Fe ₂ O ₃ ); praseodymium oxide (Pr ₆ O ₁₁ ); Nickel oxide (NiO); complex oxide of zirconium and vanadium ((Zr, V) O ₂ ); complex oxide of iron, cobalt and chromium ((Co, Fe) (Fe, Cr) ₂ O ₄ ); zirconium and Selected from the group comprising silicon composite oxide (zircon (ZrSiO ₄ )); silicon dioxide (SiO ₂ ); and zirconium, silicon, cobalt and nickel composite oxides ((Co, Ni) O · ZrSiO ₄ ) At least one oxide or compound may be included.

  Below, the content rate of a coloring agent is a content rate with respect to the total mass of the zirconia, a stabilizer, and a coloring agent in a zirconia sintered compact, a composition, and a calcined body. Further, in the zirconia sintered body and the calcined body, the colorant is not always present in the form of the compound before firing. The colorant may have reacted with components in the zirconia sintered body and calcined body. In this application, the content rate of the coloring agent in a zirconia sintered compact, a composition, and a calcined body is calculated on the basis of the compound before baking (at the time of addition). The chemical formulas described in the specification and claims show representative compositions in order to express the contents of the composition in an easy-to-understand manner, and do not necessarily strictly represent stoichiometric composition relationships. In the above composition, an acceptable range is naturally determined according to a material that is practically available for carrying out the present invention and realizing its effect.

The zirconia sintered body, the composition, and the calcined body can contain, for example, erbium oxide (Er ₂ O ₃ ) (hereinafter referred to as “colorant A”). The zirconia sintered body, the composition and the calcined body may contain nickel oxide (NiO) (hereinafter referred to as “colorant B”). The zirconia sintered body, the composition, and the calcined body can contain a composite oxide of zirconium and vanadium ((Zr, V) O ₂ ) (hereinafter referred to as “colorant C”). A zirconia sintered body, a composition, and a calcined body are composed of a composite oxide of iron, cobalt, and chromium ((Co, Fe) (Fe, Cr) ₂ O ₄ ); a composite oxide of zirconium and silicon (zircon (ZrSiO ₄ )); Silicon dioxide (SiO ₂ ); and nickel oxide (NiO) -containing mixture ((Co, Fe) (Fe, Cr) ₂ O ₄ ) / ZrSiO ₄ / SiO ₂ / NiO) (hereinafter “colorant D Can be included). The zirconia sintered body, the composition, and the calcined body can contain a composite oxide ((Co, Ni) O.ZrSiO ₄ ) (hereinafter referred to as “colorant E”) of zirconium, silicon, cobalt, and nickel. . The zirconia sintered body, the composition, and the calcined body can contain at least one colorant selected from the group including Colorant A, Colorant B, Colorant C, Colorant D, and Colorant E. .

  When the coloring agent A is added, the zirconia sintered body tends to be reddish. When the colorant B is added, the zirconia sintered body tends to be reddish. When the colorant C is added, the zirconia sintered body tends to be yellowish. When the coloring agent D is added, the zirconia sintered body tends to be grayish. When the coloring agent E is added, the zirconia sintered body tends to be grayish.

  Each colorant can also contain components other than those listed above. For example, the colorant C can contain an iron compound, a nickel compound, a niobium compound, a titanium compound and the like in addition to the above components. For example, the colorant D can contain a manganese compound, a vanadium compound, and the like in addition to the above components. For example, the colorant E can contain an iron compound in addition to the above components. Each colorant can contain components not related to color development in addition to components related to color development of the zirconia sintered body.

  In the following, regarding the content of the colorant B, the NiO component contained in the colorant other than the colorant B is not considered. In any combination of the above colorants, the content of each colorant can be adjusted, for example, so that the total amount of NiO components does not exceed a certain upper limit or less than the lower limit.

  The zirconia sintered body, the composition, and the calcined body can contain at least two colorants among the colorant A, the colorant B, the colorant C, the colorant D, and the colorant E. The zirconia sintered body, the composition, and the calcined body can contain 0% by mass to 0.5% by mass of the colorant A. The zirconia sintered body, the composition, and the calcined body can contain 0% by mass to 0.06% by mass of the colorant B. The zirconia sintered body, the composition, and the calcined body can contain 0% by mass to 0.2% by mass of the colorant C. The zirconia sintered body, the composition, and the calcined body can contain 0% by mass to 0.2% by mass of the colorant D. The zirconia sintered body, the composition, and the calcined body can contain 0% by mass to 0.1% by mass of the colorant E.

  As the colorant C, for example, “Z-300 yellow” manufactured by Nippon Ceramics Industry Co., Ltd. can be used. As the colorant D, for example, “4555 gray” manufactured by Kawamura Chemical Co., Ltd. can be used. As the colorant E, for example, “H-150 Gray” manufactured by Nippon Ceramics Industry Co., Ltd. can be used.

  Next, an example of the manufacturing method of the composition of this invention, a calcined body, and a zirconia sintered compact is demonstrated.

  First, zirconia and a stabilizer are wet mixed in water to form a slurry. Next, the slurry is dried and granulated. Next, the granulated product is calcined to produce a primary powder.

  Next, a colorant is added to each powder. The amount of the colorant added is appropriately adjusted so as to develop the color of each layer. And about each, zirconia is grind | pulverized and mixed until it becomes a desired particle size in water, and a zirconia slurry is formed. Next, the slurry is dried and granulated. When an additive such as aluminum oxide, titanium oxide, or a binder is added, it may be added when producing the primary powder, or may be added when producing the secondary powder.

  Next, press molding is performed to produce a molded product as the composition of the present invention.

  When the calcined body is not prepared, the zirconia powder is sintered by firing the composition at 1400 ° C. to 1600 ° C., preferably 1450 ° C. to 1550 ° C., to produce the zirconia sintered body of the present invention. . You may shape | mold in a desired shape in the stage of a molding.

  When producing a calcined body, the composition is fired at 800 ° C. to 1200 ° C. to produce a calcined body. Next, the calcined body is fired at 1400 ° C. to 1600 ° C., preferably 1450 ° C. to 1550 ° C., thereby sintering the zirconia powder to produce the zirconia sintered body of the present invention. The molding may be performed by cutting or the like at the stage of the calcined body, or may be performed after sintering. Molding can be performed with a CAD / CAM system.

  The method for producing a dental product is the same as the method for producing a sintered body, except that the calcined body or the sintered body is formed into a crown shape.

  According to the first embodiment, a zirconia sintered body having a color equivalent to that of natural teeth can be obtained. Thereby, when using a zirconia sintered compact as a full cantour zirconia crown, the discomfort and unnaturalness by the difference in the color of a natural tooth and a prosthesis can be reduced. Moreover, when using a zirconia sintered compact as a porcelain baking zirconia crown, the usage-amount of the porcelain for adjusting a color can be decreased. This makes it easier to match the prosthesis to the patient's tooth pattern. In addition, the burden on the patient can be reduced by reducing the amount of cutting of the patient's teeth.

  In the following embodiments, the sintered body, calcined body, and composition of the present invention will be described by paying attention to chromaticity and composition. Other matters are the same as those in the first embodiment.

  A zirconia sintered body according to a second embodiment of the present invention will be described.

Zirconia sintered body according to the second ^{embodiment, L * a * b * L} * in the color system is 66 to 69, ^{a *} is 0 to 3, when the ^{b *} is in the 21 to 27 preferred. Thereby, the color of a specific natural tooth can be reproduced.

  In the zirconia sintered body, composition, and calcined body according to the second embodiment, for example, the colorant A is 0.1% by mass to 0.5% by mass, and the colorant B is 0.01% by mass to 0.04%. 0.05% to 0.2% by mass of the colorant C and the colorant C can be contained.

  According to the second embodiment, the same effect as that of the first embodiment can be obtained.

  A zirconia sintered body according to a third embodiment of the present invention will be described.

In the zirconia sintered body according to the third embodiment, L ^* is preferably 70 to 74, a ^* is −6 to 0, and b ^* is 18 to 26 in the L ^* a ^* b ^* color system. Thereby, the color of a specific natural tooth can be reproduced.

  The zirconia sintered body, the composition, and the calcined body according to the third embodiment can contain any one of the colorant A and the colorant B and the colorant C. In the zirconia sintered body, composition and calcined body according to the third embodiment, for example, the colorant A is 0% by mass to 0.3% by mass, and the colorant B is 0.005% by mass to 0.03% by mass. And 0.04 to 0.08 mass% of the colorant C can be contained. When the coloring agent A is not included, the zirconia sintered body, the composition, and the calcined body according to the third embodiment are, for example, 0.005 mass% to 0.03% by mass of the coloring agent B, and the coloring agent C. It can contain 0.05-0.09 mass%. When the colorant A is contained, the zirconia sintered body, the composition and the calcined body according to the third embodiment are, for example, 0.05% by mass to 0.3% by mass of the colorant A and 0% of the colorant B. 0.005% by mass to 0.02% by mass and 0.03 to 0.09% by mass of the colorant C can be contained.

  According to the third embodiment, the same effect as that of the first embodiment can be obtained.

  A zirconia sintered body according to a fourth embodiment of the present invention will be described.

Zirconia sintered body according to the fourth ^embodiment, L ^* a * ^{b * L} in color system ^* is from 75 to 76, ^{a *} is the -3 to-1, ^{b *} preferably a 3-6. Thereby, the color of a specific natural tooth can be reproduced.

  In the zirconia sintered body, composition and calcined body according to the fourth embodiment, for example, the colorant A is 0.002% by mass to 0.005% by mass, and the colorant B is 0.0001% by mass to 0.0006. It is possible to contain 0.006 to 0.02 mass% of the mass% and the colorant C.

  According to the fourth embodiment, the same effect as in the first embodiment can be obtained.

  A zirconia sintered body according to a fifth embodiment of the present invention will be described.

Zirconia sintered body according to the fifth ^{embodiment, L * a * b * L} * in the color system is 64-75, ^{a *} is -2～3, the ^{b *} is in the 7 to 19 preferred. Thereby, the color of a specific natural tooth can be reproduced.

  The zirconia sintered body, the composition, and the calcined body according to the fifth embodiment contain at least two colorants among the colorant A, the colorant B, the colorant C, the colorant D, and the colorant E. It is preferable that the zirconia sintered body, the composition, and the calcined body according to the fifth embodiment contain at least one colorant among the colorant A, the colorant B, and the colorant C. Moreover, it is preferable that the zirconia sintered body, composition, and calcined body according to the fifth embodiment contain at least one colorant among the colorant D and the colorant E. The zirconia sintered body, the composition and the calcined body are, for example, 0% by mass to 0.4% by mass of the colorant A, 0% by mass to 0.06% by mass of the colorant B, and 0% by mass of the colorant C. -0.09 mass%, 0% by mass to 0.2% by mass of the colorant D, and 0% by mass to 0.1% by mass of the colorant E can be contained. In the case of containing the colorant A, the zirconia sintered body, the composition and the calcined body can contain 0.002% by mass or more of the colorant A. When the colorant B is contained, the zirconia sintered body, the composition, and the calcined body can contain 0.0009% by mass or more of the colorant B. In the case of containing the colorant C, the zirconia sintered body, the composition and the calcined body can contain 0.006% by mass or more of the colorant C. When the coloring agent D is contained, the zirconia sintered body, the composition and the calcined body can contain 0.005% by mass or more of the coloring agent D. When the coloring agent E is contained, the zirconia sintered body, the composition and the calcined body can contain 0.05% by mass or more of the coloring agent E.

  In the case of containing the colorant C and the colorant E, the zirconia sintered body, the composition and the calcined body have a colorant C of 0.005% by mass to 0.02% by mass and a colorant E of 0.06% by mass. % -0.08 mass% can be contained.

  When the colorant C and the colorant D are contained, the zirconia sintered body, the composition and the calcined body are 0.07% by mass to 0.09% by mass of the colorant C, and 0.05% by mass of the colorant D. % To 0.2% by mass.

  When the coloring agent B and the coloring agent D are contained, the zirconia sintered body, the composition, and the calcined body are 0.007% by mass to 0.06% by mass of the coloring agent B, and 0.01% by mass of the coloring agent D. % -0.06 mass% can be contained.

  When the coloring agent A, the coloring agent C, and the coloring agent D are contained, the zirconia sintered body, the composition, and the calcined body include 0.01% by mass to 0.04% by mass of the coloring agent A, and 0% of the coloring agent C. 0.05% by mass to 0.07% by mass and 0.05% by mass to 0.08% by mass of the coloring agent D can be contained.

  When the coloring agent A, the coloring agent B, the coloring agent C, and the coloring agent D are contained, the zirconia sintered body, the composition, and the calcined body have the coloring agent A of 0.002% by mass to 0.3% by mass, coloring. 0.0005 mass% to 0.03 mass% of the colorant B, 0.005 mass% to 0.07 mass% of the colorant C, and 0.004 mass% to 0.04 mass% of the colorant D are contained. Can do.

  According to the fifth embodiment, the same effect as that of the first embodiment can be obtained.

  A zirconia sintered body according to a sixth embodiment of the present invention will be described.

Zirconia sintered body according to the sixth ^{embodiment, L * a * b * L} * in the color system is 70 to 73, ^{a *} is -2～1, the ^{b *} is in the 11 to 17 preferred. Thereby, the color of a specific natural tooth can be reproduced.

  In the zirconia sintered body, composition and calcined body according to the sixth embodiment, for example, the colorant A is 0.5% by mass to 0.2% by mass, and the colorant B is 0.007% by mass to 0.07%. % By mass, 0.01% to 0.04% by mass of the colorant C, and 0.004% to 0.02% by mass of the colorant D can be contained.

  According to the sixth embodiment, the same effect as in the first embodiment can be obtained.

  A dental product according to a seventh embodiment of the present invention will be described.

  The dental product includes the zirconia sintered body or calcined body according to the above embodiment. The dental product may further include a porcelain material (for example, a glass material) laminated on the zirconia sintered body or the calcined body. The porcelain material can contain a yellowing prevention material. As the yellowing prevention material, for example, an antimony compound can be used.

  Dental products include, for example, prosthetic materials such as ceramic frames and full cantour crowns. The dental prosthetic material preferably has a crown shape. The dental products include, for example, orthodontic products (for example, orthodontic brackets) and dental implant products (for example, dental implant abutments).

  A zirconia sintered body to which the colorant described in the following table was added was prepared, and the chromaticity was measured for each sample. First, a colorant was added to and mixed with partially stabilized zirconia powder containing 4 mol% of yttria as a stabilizer. Next, 1.2 g of the mixture was put into a cylindrical mold having a diameter of about 18 mm and molded at a pressure of 30 kN to prepare a molding composition. Next, the molding composition was fired at 1500 ° C. for 2 hours to produce a disk-shaped zirconia sintered body. Next, the sample surface was polished and the surface was finished to a mirror surface (# 2000 or more) to prepare a sample. Then, the chromaticity of each sample was measured using a chromaticity measuring machine (CE100-DC / US manufactured by Olympus) and analysis software (Crystalley) with a black background. Tables 1 and 2 show the type and amount of the added colorant and the chromaticity measurement results.

In Tables 1 and 2, Colorant A is erbium oxide (Er ₂ O ₃ ) manufactured by Iwatani Corporation. Colorant B is nickel oxide (NiO) manufactured by Iwatsuki Kasumi Co., Ltd. The colorant C is “Z-300 yellow” manufactured by Nissho Pigment Industries, Ltd., which is a complex oxide of zirconium and vanadium ((Zr, V) O ₂ ). The colorant D is a composite oxide of iron, cobalt and chromium ((Co, Fe) (Fe, Cr) ₂ O ₄ ); a composite oxide of zirconium and silicon (zircon (ZrSiO ₄ )); silicon dioxide (SiO ₂ ). ); And a mixture of nickel oxide (NiO) ((Co, Fe) (Fe, Cr) ₂ O ₄ ) / ZrSiO ₄ / SiO ₂ / NiO) “4555 Gray” manufactured by Kawamura Chemical Co., Ltd. The colorant E is “H-150 gray” manufactured by Nissho Pigment Industrial Co., Ltd., which is a composite oxide of zirconium, silicon, cobalt, and nickel ((Co, Ni) O · ZrSiO ₄ ).

  All the samples of Examples 1 to 55 had a natural tooth-like color. When the color of each sample was compared visually, the sample which concerns on Examples 1-11 had the color of the same system | strain. The samples according to Examples 12 to 25 had the same color. The samples according to Examples 26 to 27 had the same color. The samples according to Examples 28 to 49 had the same color. The samples according to Examples 50 to 55 had the same color. Therefore, the samples according to Examples 1 to 55 were roughly classified into five systems according to colors. Note that the samples of Examples 1 to 55 can be further classified according to color.

  As a reference, the following table shows the elemental analysis results of Colorant C, Colorant D, and Colorant E used in the examples. Table 3 shows the analysis result of Colorant C, Table 4 shows the analysis result of Colorant D, and Table 5 shows the analysis result of Colorant E. In the following table, the mass ratio converted to the oxide of each element is shown, and it does not necessarily mean that the colorant contains each element in the form of the oxide described in the table in the colorant. .

  Each disclosure of the above patent document is incorporated herein by reference. Although the zirconia sintered body and dental product of the present invention have been described based on the above-described embodiment, the present invention is not limited to the above-described embodiment. Various modifications, changes and improvements to various disclosed elements (including each element of each claim, each element of each embodiment or example, each element of each drawing, etc.) based on the technical idea Needless to say, you can. Various combinations and replacements of various disclosed elements (including each element of each claim, each element of each embodiment or example, each element of each drawing, etc.) within the scope of the entire disclosure of the present invention. Selection is possible.

  Further problems, objects, and developments of the present invention will become apparent from the entire disclosure of the present invention including the claims.

  Regarding numerical ranges described in this document, any numerical value or small range included in the range should be construed as being specifically described even if there is no specific description.

Claims (9)

L ^* a ^* b ^* L ^* in the color system is 64 to less than 70 , a ^* is -6 to 3, b ^* is 3 to 27,
Erbium oxide,
Nickel oxide,
A complex oxide of zirconium and vanadium,
Complex oxides of iron, cobalt and chromium,
A composite oxide of zirconium and silicon,
Containing at least one colorant selected from the group comprising silicon dioxide and a composite oxide of zirconium, silicon, cobalt and nickel;
Containing at least a colorant of the composite oxide of zirconium and vanadium,
Zirconia sintered body. Colorant A: erbium oxide,
Colorant B: nickel oxide,
Colorant C: complex oxide of zirconium and vanadium,
Colorant D: a complex oxide of iron, cobalt and chromium, a complex oxide of zirconium and silicon, a mixture of silicon dioxide and nickel oxide, and a colorant E: a group comprising a complex oxide of zirconium, silicon, cobalt and nickel Containing at least one colorant selected from
Containing at least colorant C,
The zirconia sintered body according to claim 1. 0% by mass to 0.5% by mass of the colorant A,
0% by mass to 0.06% by mass of the colorant B,
0% by mass to 0.2% by mass of the colorant C,
Containing 0% to 0.2% by weight of the colorant D, and 0% to 0.1% by weight of the colorant E;
Containing at least two colorants among the colorant A, the colorant B, the colorant C, the colorant D, and the colorant E;
The colorant C is contained in an amount of more than 0% by mass and 0.2% by mass or less
The zirconia sintered body according to claim 2. L ^* a ^* b ^* is ^{L *} is 66 to 69 in the color system, ^{a *} is 0 to 3, ^{b *} is 21 to 27, the zirconia sintered body according to claim 2 or 3. 0.1% by mass to 0.5% by mass of the colorant A,
The zirconia sintered body according to claim 4, comprising 0.01 to 0.04 mass% of the colorant B and 0.05 to 0.2 mass% of the colorant C. L ^* a ^* b ^* a ^{L *} of less than 64 to 70 in the color system, ^{a *} is -2~3, ^{b *} is 7-19, zirconia sintered according to claim 2 or 3 body. Containing at least one colorant among the colorant A, the colorant B, and the colorant C;
Containing at least one colorant out of the colorant D and the colorant E;
0% by mass to 0.4% by mass of the colorant A,
0% by mass to 0.06% by mass of the colorant B,
More than 0% by weight of the colorant C and 0.09% by weight or less,
Wherein the colorant D 0 wt% to 0.2 wt%, and the coloring agent E containing 0.1 wt% 0 wt%, the zirconia sintered body according to claim 6. L ^* a ^* b ^* L ^* in the color system is 64 to 76, a ^* is -6 to 3, b ^* is 3 to 27,
Erbium oxide,
Nickel oxide,
A complex oxide of zirconium and vanadium,
Complex oxides of iron, cobalt and chromium,
A composite oxide of zirconium and silicon,
Containing at least one colorant selected from the group comprising silicon dioxide and a composite oxide of zirconium, silicon, cobalt and nickel;
Containing at least a coloring agent of a composite oxide of zirconium and vanadium ;
Containing more than 0% by weight and less than 0.01% by weight of the colorant of the composite oxide of zirconium and vanadium,
Zirconia sintered body. Dental product comprising a zirconia sintered body according to any one of claims 1-8.