Classifications

• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61C—DENTISTRY; APPARATUS OR METHODS FOR ORAL OR DENTAL HYGIENE
  • A61C13/00—Dental prostheses; Making same
  • A61C13/08—Artificial teeth; Making same
  • A61C13/082—Cosmetic aspects, e.g. inlays; Determination of the colour
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61C—DENTISTRY; APPARATUS OR METHODS FOR ORAL OR DENTAL HYGIENE
  • A61C13/00—Dental prostheses; Making same
  • A61C13/0003—Making bridge-work, inlays, implants or the like
  • A61C13/0006—Production methods
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61C—DENTISTRY; APPARATUS OR METHODS FOR ORAL OR DENTAL HYGIENE
  • A61C13/00—Dental prostheses; Making same
  • A61C13/08—Artificial teeth; Making same
  • A61C13/083—Porcelain or ceramic teeth
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61C—DENTISTRY; APPARATUS OR METHODS FOR ORAL OR DENTAL HYGIENE
  • A61C13/00—Dental prostheses; Making same
  • A61C13/20—Methods or devices for soldering, casting, moulding or melting
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61C—DENTISTRY; APPARATUS OR METHODS FOR ORAL OR DENTAL HYGIENE
  • A61C5/00—Filling or capping teeth
  • A61C5/70—Tooth crowns; Making thereof
  • A61C5/77—Methods or devices for making crowns
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
  • A61K6/00—Preparations for dentistry
  • A61K6/15—Compositions characterised by their physical properties
  • A61K6/16—Refractive index
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
  • A61K6/00—Preparations for dentistry
  • A61K6/20—Protective coatings for natural or artificial teeth, e.g. sealings, dye coatings or varnish
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
  • A61K6/00—Preparations for dentistry
  • A61K6/60—Preparations for dentistry comprising organic or organo-metallic additives
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
  • A61K6/00—Preparations for dentistry
  • A61K6/60—Preparations for dentistry comprising organic or organo-metallic additives
  • A61K6/65—Dyes
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
  • A61K6/00—Preparations for dentistry
  • A61K6/80—Preparations for artificial teeth, for filling teeth or for capping teeth
  • A61K6/802—Preparations for artificial teeth, for filling teeth or for capping teeth comprising ceramics
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
  • A61K6/00—Preparations for dentistry
  • A61K6/80—Preparations for artificial teeth, for filling teeth or for capping teeth
  • A61K6/831—Preparations for artificial teeth, for filling teeth or for capping teeth comprising non-metallic elements or compounds thereof, e.g. carbon
  • A61K6/836—Glass
• • C—CHEMISTRY; METALLURGY
  • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
  • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
  • C04B33/00—Clay-wares
  • C04B33/32—Burning methods
  • C04B33/34—Burning methods combined with glazing
• • C—CHEMISTRY; METALLURGY
  • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
  • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
  • C04B41/00—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone
  • C04B41/009—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone characterised by the material treated
• • C—CHEMISTRY; METALLURGY
  • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
  • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
  • C04B41/00—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone
  • C04B41/45—Coating or impregnating, e.g. injection in masonry, partial coating of green or fired ceramics, organic coating compositions for adhering together two concrete elements
  • C04B41/50—Coating or impregnating, e.g. injection in masonry, partial coating of green or fired ceramics, organic coating compositions for adhering together two concrete elements with inorganic materials
  • C04B41/5022—Coating or impregnating, e.g. injection in masonry, partial coating of green or fired ceramics, organic coating compositions for adhering together two concrete elements with inorganic materials with vitreous materials
• • C—CHEMISTRY; METALLURGY
  • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
  • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
  • C04B41/00—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone
  • C04B41/80—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone of only ceramics
  • C04B41/81—Coating or impregnation
  • C04B41/85—Coating or impregnation with inorganic materials
  • C04B41/87—Ceramics
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61C—DENTISTRY; APPARATUS OR METHODS FOR ORAL OR DENTAL HYGIENE
  • A61C5/00—Filling or capping teeth
  • A61C5/70—Tooth crowns; Making thereof
• • C—CHEMISTRY; METALLURGY
  • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
  • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
  • C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
  • C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
  • C04B2111/00836—Uses not provided for elsewhere in C04B2111/00 for medical or dental applications
• • C—CHEMISTRY; METALLURGY
  • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
  • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
  • C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
  • C04B2111/80—Optical properties, e.g. transparency or reflexibility
  • C04B2111/807—Luminescent or fluorescent materials
• • C—CHEMISTRY; METALLURGY
  • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
  • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
  • C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
  • C04B2111/80—Optical properties, e.g. transparency or reflexibility
  • C04B2111/82—Coloured materials

Definitions

• the present invention relates to a dental porcelain paste, a dental porcelain kit containing the dental porcelain paste, and a method for manufacturing a dental porcelain prosthesis using the dental porcelain paste.
• Ceramics have a transparency and color similar to natural teeth, making them indispensable materials for manufacturing dental crowns, which require aesthetics.
• dental crowns are made by mixing ceramics in advance with a dental mixture consisting of porcelain and one or more selected from water and organic solvents, or by mixing ceramics with one or more selected from water and organic solvents in the form of a paste. It is produced by repeating the process of building up and firing a porcelain material on a frame (for example, a metal frame or a ceramic frame) that covers the abutment tooth.
• Patent Document 1 contains a coloring agent (A) that decolorizes during firing, an organic solvent (B), and a porcelain powder (C), and the porcelain powder (C) contains an inorganic pigment.
• a pasty dental porcelain is disclosed.
• a base material in a dental prosthesis made of ceramic materials zirconium oxide (zirconia), aluminum oxide (alumina), feldspathic glass, disilicate glass, etc. are used. Recently, opportunities to process these materials using dental CAD/CAM systems and use them as dental prostheses have increased.
• the dental prosthesis made of the ceramic material include a porcelain fused to metal (PFM) type, a zirconia all-ceramic (PFZ) type, and a full zirconia (Full Contour) type.
• PFM porcelain fused to metal
• PFZ zirconia all-ceramic
• Full Contour Full zirconia
• Zirconia , FCZ) type and Lithium Disilicate (LDS) type dental prostheses are known as representative examples.
• Dental porcelain materials such as stain porcelain and glaze porcelain are used to finish these dental prostheses.
• Patent Document 2 describes a ceramic dental crown porcelain material containing two or more types of aluminosilicate glasses and
• glazed porcelain is generally used mainly for the purpose of polishing dental prostheses, and the color difference between it and the base material after firing (hereinafter also referred to as "base material") is small. is required. Therefore, the porcelain paste used as glaze porcelain is transparent to translucent even before firing, and has almost no color saturation. However, when such porcelain paste is used, it is difficult to distinguish between areas where glazed porcelain has been applied and areas where it has not been applied or to confirm the application thickness during the application process, and as a result, the porcelain paste Paint leakage and paint spots are more likely to occur.
• Patent Document 1 mentions the color difference between the paste before and after firing.
• the paste-like dental porcelain disclosed in the examples of Patent Document 1 mainly relates to stain porcelain, and glaze porcelain is not disclosed.
• the paste dental porcelain disclosed in Patent Document 1 is used as a glaze porcelain, further improvement is required in terms of the above-mentioned distinguishability.
• Patent Document 2 does not mention the aforementioned problems associated with the use of glazed porcelain. Therefore, when dental porcelain paste can be used as a glaze porcelain, it is required to further improve its distinguishability.
• an object of the present invention is to provide a dental porcelain paste that is excellent in distinguishability during application work before firing.
• the present invention includes the following inventions.
• [1] Contains a glass powder (A), an organic solvent (B), and a coloring agent (C) that disappears during firing, and satisfies at least one condition selected from the following conditions (1) and (2).
• Condition (1) The color tone obtained by measuring the color of a dental porcelain paste with a thickness of 0.5 mm before firing in the L * a * b * color space and the dental porcelain paste being vacuum fired at 740°C.
• the color difference ⁇ E * calculated from the color tone obtained by measuring the fired body with a thickness of 0.5 mm in the L * a * b * color space is 8.5 or more Condition (2): Before firing The brightness obtained by measuring the color of a dental porcelain paste with a thickness of 0.5 mm in the L * a * b * color space and the thickness of 0.5 mm obtained by vacuum firing the dental porcelain paste at 740°C. The lightness difference ⁇ L * calculated from the lightness obtained by measuring the color of a 5 mm fired body in the L * a * b * color space is 6.5 or more [2] The base material is measured in the L * a * b * color space.
• [4] The above [1] to [1], wherein the content of component (C) is 0.001 parts by mass or more and less than 0.60 parts by mass, based on 100 parts by mass of components (A) and (B) in total.
• [5] The dental porcelain paste according to any one of [1] to [4] above, wherein component (C) contains an organic pigment that dissolves in component (B).
• [6] The dental porcelain paste according to [5] above, wherein the organic pigment is an aromatic organic pigment.
• a dental porcelain kit comprising the dental porcelain paste according to any one of [1] to [10] above, and a color sample for matching the coating thickness of the dental porcelain paste.
• a method for manufacturing a dental prosthesis including a firing step (II).
• the method for manufacturing a dental prosthesis according to [12] or [13] which includes using a color sample for matching the coating thickness of the dental porcelain paste in the step (I).
• the upper and lower limits of numerical ranges can be combined as appropriate. That is, in this specification, the lower limit values and upper limit values described in stages for numerical ranges can be independently combined. For example, from the description "preferably 10 to 90, more preferably 30 to 60" for the same item, combining the “preferred lower limit (10)” and “more preferable upper limit (60)” to “10 to 60” ” can also be used.
• the upper limit is not specified, and only the lower limit is “10 or more” or “30 or more.” Similarly, only the upper limit value can be defined as “90 or less” or “60 or less” without specifically specifying the lower limit value. Note that unless otherwise specified, when a numerical range is simply described as “10 to 90", it represents a range of 10 to 90.
• the term “distinctiveness” refers to the term “distinctiveness” used when applying a dental porcelain paste before firing to a base. It refers to the characteristic that allows you to visually distinguish between coated areas and uncoated areas. Specifically, it refers to characteristics evaluated by the method described in Examples. Further, in this specification, unless otherwise specified, when simply referred to as a "fired body”, the “fired body” refers to a fired body obtained by firing a dental porcelain paste.
• Dental porcelain paste (hereinafter also simply referred to as “porcelain paste”), which is one aspect of the present invention, includes glass powder (A) (hereinafter also simply referred to as “component (A)”), an organic solvent ( B) (hereinafter also simply referred to as “component (B)”), and a coloring agent (C) (hereinafter simply referred to as “component (C)”) that disappears during firing, and under the following conditions. At least one condition selected from (1) and (2) is satisfied.
• Condition (1) The color tone obtained by measuring the color of a dental porcelain paste with a thickness of 0.5 mm before firing in the L * a * b * color space and the dental porcelain paste being vacuum fired at 740°C.
• the color difference ⁇ E * calculated from the color tone obtained by measuring the fired body with a thickness of 0.5 mm in the L * a * b * color space is 8.5 or more Condition (2): Before firing The brightness obtained by measuring the color of a dental porcelain paste with a thickness of 0.5 mm in the L * a * b * color space and the thickness of 0.5 mm obtained by vacuum firing the dental porcelain paste at 740°C. The lightness difference ⁇ L * calculated from the lightness obtained by measuring the color of a 5 mm fired body in the L * a * b * color space is 6.5 or more. By including the coloring agent (C), it becomes possible to satisfy at least one condition selected from the conditions (1) and (2).
• the color difference ⁇ E * is preferably 11.0 or more, more preferably 15.0 or more, still more preferably 20.0 or more, even more preferably 30.0. It is more preferably 40.0 or more. Further, there is no particular restriction on the upper limit of the color difference ⁇ E * , but for example, the color difference ⁇ E * is preferably 95.0 or less, more preferably 90.0 or less, still more preferably 85.0 or less, even more preferably It is 80.0 or less. As described above, these lower and upper limits described in stages can be independently combined.
• the color difference ⁇ E * is 8.5 to 95.0, preferably 11.0 to 95.0, more preferably 15.0 to 90.0, still more preferably 20.0. ⁇ 85.0, more preferably 30.0 ⁇ 80.0, even more preferably 40.0 ⁇ 80.0.
• the color difference ⁇ E * according to the condition (1) is calculated by the method described in Examples.
• the lightness difference ⁇ L * is preferably 11.0 or more, more preferably 15.0 or more, still more preferably 18.0 or more, even more preferably 20. It is 0 or more, more preferably 25.0 or more.
• the color difference ⁇ L * is preferably 100.0 or less, more preferably 80.0 or less, and still more preferably 60.0 or less.
• the lightness difference ⁇ L * is 6.5 to 100.0, preferably 11.0 to 100.0, more preferably 15.0 to 80.0, even more preferably 18. 0 to 80.0, more preferably 20.0 to 60.0, even more preferably 25.0 to 60.0.
• the color difference ⁇ L * according to the condition (2) is calculated by the method described in Examples.
• the dental porcelain paste has a color tone obtained by measuring the color of the base material in the L * a * b * color space, and a color tone obtained by measuring the color of the base material in the L*a*b* color space.
• the color difference ⁇ E1 * calculated from the color tone obtained by measuring the dental porcelain paste applied to the top with a thickness of 0.5 mm in the L * a * b * color space is 11.0 or more. It is preferably 15.0 or more, more preferably 20.0 or more, even more preferably 30.0 or more, even more preferably 40.0 or more.
• the color difference ⁇ E1 * is preferably 95.0 or less, more preferably 90.0 or less, still more preferably 85.0 or less, and even more preferably is 80.0 or less.
• the color difference ⁇ E1 * is preferably 11.0 to 95.0, more preferably 15.0 to 90.0, still more preferably 20.0 to 85.0, even more preferably is from 30.0 to 80.0, more preferably from 40.0 to 80.0.
• the color difference ⁇ E1 * is calculated by the method described in Examples.
• the "base material” used for calculating the color difference ⁇ E1 * refers to a base material for calculating the color difference ⁇ E1 * , and specifically refers to a specific base material described in the examples described later. Refers to the base material. Therefore, the type of "base material” to which the porcelain paste is applied is not limited in any way, and similarly the type of "base material” to which the porcelain paste is applied in step (I) described later is limited. It's not limited either.
• the dental porcelain paste has a color tone obtained by measuring the color of the base material in the L *a*b* color space, and a color tone obtained by measuring the base material in the L* a * b * color space.
• a dental porcelain paste was applied onto the base material so that the thickness after firing was 65 ⁇ m , and the fired product was vacuum fired at 740 °C .
• the color difference ⁇ E2 * calculated from the color tone is preferably 3.0 or less, more preferably 2.5 or less, even more preferably 2.0 or less, and 1.5 or less. is even more preferable, and even more preferably 1.2 or less.
• the color difference ⁇ E2 * is preferably 0.0 or more. As described above, these lower and upper limits described in stages can be independently combined.
• the color difference ⁇ E2 * is preferably 0.0 to 3.0, more preferably 0.0 to 2.5, even more preferably 0.0 to 2.0, even more preferably is from 0.0 to 1.5, more preferably from 0.0 to 1.2.
• the color difference ⁇ E2 * is calculated by the method described in Examples.
• the "base material" used for calculating the color difference ⁇ E2 * refers to a base material described in Examples described later.
• the glass powder (A) is not particularly limited, and is preferably one that can be used for dental purposes, and may contain crystals.
• Examples of the material for component (A) include glass containing SiO 2 as a main component (the component with the highest content in glass) or crystallized glass.
• Such glasses include, in addition to SiO 2 , Al 2 O 3 , B 2 O 3 , ZnO, K 2 O, Na 2 O, Li 2 O, ZrO 2 , CaO, MgO, Sb 2 O 3 , CeO 2 , May contain BaO, SnO 2 etc., for example, amorphous type potassium aluminosilicate glass (4SiO 2 .Al 2 O 3 .K 2 O), leucite crystal type potassium aluminosilicate glass, fluoroapatite glass, and At least one selected from the group consisting of lithium silicate glasses can be suitably used. Among these, amorphous type potassium aluminosilicate glass is more preferred.
• crystals examples include leucite, potassium feldspar, fluorophlogopite, diopside, mica, ⁇ -spodumene (LiAlSi 2 O 6 ), ⁇ -calcium metaphosphate, apatite, magnesium titanate, ⁇ -eucrypt Examples include tight, alumina, etc.
• the component (A) can be used alone or in an appropriate combination of two or more.
• ceramic raw materials such as SiO 2 , Al 2 O 3 , B 2 O 3 , ZnO, K Oxides such as 2 O, Na 2 O, Li 2 O, ZrO 2 , CaO, MgO, Sb 2 O 3 , CeO 2 , BaO, SnO 2 ; SiO 2 , Al 2 O when heated in the atmosphere 3.
• Substances that can become the oxides such as B2O3 , ZnO, K2O , Na2O , Li2O , ZrO2 , CaO, MgO, Sb2O3 , CeO2 , BaO, SnO2 ;
• a mixture of each of the above oxides and a substance that can become each of the above oxides when heated in the atmosphere can be used.
• the glass composition obtained in advance is determined by calculation, and the formulation of each raw material is determined and mixed.
• the method of mixing the raw materials is not particularly limited, and it is preferable that they be uniformly dispersed.
• These mixed raw materials are heated to about 700°C or higher.
• the heating method is not particularly limited, as long as all the raw materials are melted and a uniform melt is produced. There are no particular limitations on the method for cooling the molten material, and air cooling or the like may be used.
• the glass lump thus obtained is crushed and classified to obtain component (A) with adjusted particle size.
• the method of crushing and classifying glass lumps is not particularly limited, and examples of crushing equipment include compression crushers such as jaw crushers and cone crushers; ball mills such as vibrating ball mills and planetary mills; tower type crushers; Media stirring type crushers such as stirring tank type crushers and annular type crushers; high-speed rotating impact crushers such as pin mills and disc mills; other roll mills; jet crushers; autogenous crushers; and the like.
• Examples of the classification device include sieve classifiers such as vibrating sieves and sifters; centrifugal classifiers such as cyclones; wet classifiers such as sedimentation classifiers; and the like.
• the average particle diameter of component (A) is preferably 1 to 30 ⁇ m, more preferably 2 to 20 ⁇ m, and still more preferably 3 to 9 ⁇ m. It is preferable that the average particle diameter is 1 ⁇ m or more because it becomes easier to suppress a decrease in the transparency of the prosthesis. Moreover, it is preferable that the average particle diameter is 30 ⁇ m or less, from the viewpoint of making it easier to apply the porcelain paste.
• the average particle size of component (A) refers to the volume-based average particle size (D50) that can be determined by measurement using a laser diffraction scattering method, and can be measured, for example, by the method described in Examples. .
• the glass transition temperature of component (A) is preferably 400 to 600°C, more preferably 420 to 580°C, and even more preferably 450 to 550°C, from the viewpoint of allowing firing at a lower temperature and shortening the firing time. It is °C. Further, from the same viewpoint, the softening point of component (A) is preferably 500 to 680°C, more preferably 520 to 650°C, and even more preferably 550 to 630°C. When the glass transition temperature is 400°C or higher, or when the softening point is 500°C or higher, it is preferable because component (A) can be prevented from dripping during firing. In addition, when the glass transition temperature is 600°C or lower, or when the softening point is 680°C or lower, firing at a low temperature is possible. This is preferable because deformation of the ceramic frame can be avoided.
• the coefficient of linear thermal expansion (50 to 500°C) of component (A) can be selected as appropriate depending on the material of the base to which the porcelain paste is applied, and is not particularly limited, but is 4.0 ⁇ 10 -6 to 6.0. ⁇ 10 -6 /°C, for example, 6.1 ⁇ 10 -6 to 13.5 ⁇ 10 -6 / °C, 6.3 ⁇ 10 -6 to 12.5 ⁇ 10 -6 /°C.
• the linear thermal expansion coefficient of component (A) is preferably 9.0 ⁇ 10 ⁇ 6 to 11.0 ⁇ 10 ⁇ 6 /°C.
• the linear thermal expansion coefficient of component (A) is preferably 6.1 ⁇ 10 ⁇ 6 to 8.8 ⁇ 10 ⁇ 6 /°C.
• the coefficient of linear thermal expansion can be measured, for example, by heating a sample from room temperature (25°C) to 500°C using a thermal analyzer TMA120 (manufactured by Seiko Instruments Inc., heating rate 5°C/min).
• the linear thermal expansion coefficient can be adjusted by a known method, for example, by adjusting the K 2 O content.
• the content of component (A) is preferably 40 to 80 parts by mass, more preferably 45 to 75 parts by mass, based on a total of 100 parts by mass of components (A) and (B). , more preferably 50 to 70 parts by mass.
• Organic solvent (B) examples include esters such as dimethyl phthalate, diethyl phthalate, and dibutyl phthalate; Methanol, ethanol, 1-propanol, 2-propanol, isopropanol, 1-butanol, 2-butanol, 1-heptanol, 2-heptanol, 3-heptanol, 1-hexanol, 2-hexanol, 3-hexanol, 2-methyl- 1-pentanol, 3-methyl-1-pentanol, 4-methyl-1-pentanol, 2-methyl-2-pentanol, 2-methyl-3-pentanol, 2,2-dimethyl-1-butanol , a monohydric alcohol such as 2-ethyl-1-butanol; 1,2-ethanediol, 1,2-propanediol, 1,3-propanediol, 1,2-butanediol, 1,3-butane
• Component (B) is preferably at least one selected from the group consisting of polyhydric alcohols, aromatic alcohols, and polyhydric alcohol monoethers, and more preferably at least one selected from polyhydric alcohols and aromatic alcohols.
• component (B) among the above-mentioned compounds, 1,2-propanediol, 1,3-butanediol, 1,4-butanediol, 3-methyl-1,3-butanediol (also known as isoprene At least one selected from the group consisting of glycol), 3-methyl-1,5-pentanediol, 2-ethyl-1,3-hexanediol, and 2-phenoxyethanol is more preferred.
• component (B) it is preferable that alcohol is liquid at 20°C.
• the boiling point of component (B) is preferably 100 to 300°C, more preferably 100 to 280°C, and even more preferably 100 to 250°C.
• the content of component (B) in the dental porcelain paste is not particularly limited, but is preferably 20 to 60 parts by mass, more preferably 20 to 60 parts by mass, based on a total of 100 parts by mass of component (A) and component (B). is 25 to 55 parts by weight, more preferably 30 to 50 parts by weight. It is preferable that the content of component (B) is 20 parts by mass or more because the kneading properties of component (A) and component (B) are improved and it becomes easier to form a paste. Moreover, it is preferable that the content of the component (B) is 60 parts by mass or less because it is easy to ensure the amount of glass component in the porcelain paste and the work of applying the porcelain paste is easy.
• component (C) burns through during firing.
• the dental porcelain paste can satisfy at least one condition selected from the conditions (1) and (2).
• decoloring in component (C) refers to ceramics containing glass powder (A) and organic solvent (B), but not containing a coloring agent (C) that decolors during firing.
• the color difference ⁇ E * ab between the fired body of porcelain paste (I) and the fired body of porcelain paste (II) is determined, preferably less than 0.50, more preferably less than 0.30, still more preferably 0.20. means less than.
• the firing conditions other than the firing temperature and the method for measuring the color difference ⁇ E * ab are as described in Examples below.
• component (C) contains an organic dye that is dissolved in component (B).
• solvents in component (B) means that no clouding is visually observed when 1 g is added to 10 mL of component (B) at 25°C.
• the content of the organic dye is preferably 60% by mass or more, more preferably 80% by mass or more, still more preferably 90% by mass or more, even more preferably 98% by mass or more, based on 100% by mass of component (C). , and 100% by mass or less. As described above, these lower and upper limits described in stages can be independently combined.
• the content of the organic dye is preferably 60 to 100% by mass, more preferably 80 to 100% by mass, and even more preferably 90 to 100% by mass based on 100% by mass of component (C). %, more preferably 98 to 100% by weight.
• the organic dye is preferably an aromatic organic dye.
• the aromatic organic dye is an organic dye containing one or more optionally substituted aromatic groups, and preferably has an auxochrome in addition to a chromophore.
• the chromophore is not particularly limited as long as it is an atomic group that is bonded to an aromatic ring and causes color development.
• the aromatic organic dye may contain one type of these atomic groups alone or an appropriate combination of two or more types.
• the auxochrome include a hydroxyl group, an amino group, a carboxyl group, a sulfone group, and a halogen atom.
• the aromatic organic dye may contain one of these auxochromes or a suitable combination of two or more.
• the organic dye is preferably at least one selected from the group consisting of anthraquinone compounds, azo compounds, xanthene compounds, porphyrin compounds, phthalocyanine compounds, and triarylmethane compounds; At least one selected from the group consisting of azo-based compounds, xanthene-based compounds, and phthalocyanine-based compounds is more preferred, and at least one selected from azo-based compounds and phthalocyanine-based compounds is even more preferred. Since these compounds have good coloring properties, it is possible to reduce the content of component (C) in the porcelain paste, and as mentioned above, they can reduce the combustion of component (C) during firing. It is also preferable from the viewpoint of reducing the amount of residue and further suppressing the occurrence of bubbles and carbonization in the obtained fired body.
• organic dyes are not limited as long as the effects of the present invention can be achieved, but examples include the following organic dyes.
• C.I. Direct Blue 25, 86, 90, 108)
• C.I. Direct Blue 25, 86, 90, 108)
• Direct Blue 90 C.I. Direct Blue 108''. ⁇ C.
• I. Direct blue 25, 86, 90, 108) ⁇ C.
• I. Solvent blue 11, 14, 18, 25, 37, 44, 45, 49, 58, 59, 68, 78, 94) ⁇ C. I.
• Acid blue (1, 3, 7, 9, 15, 83, 90, 103, 104, 158, 161, 249) ⁇ C.
• Basic blue (1, 3, 7, 9, 25, 105) ⁇ C.
• I. Disperse Blue (198) ⁇ C.
• I. Mordant blue (1) ⁇ C.
• I. Solvent red (25, 27, 30, 35, 49, 83, 89, 100, 122, 138, 149, 150, 160, 179, 218, 230) ⁇ C.
• Acid Red (6, 8, 9, 13, 14, 18, 26, 27, 51, 52, 87, 88, 89, 92, 94, 97, 111, 114, 115, 134, 145, 151, 154, 180 , 183, 184, 186, 198) ⁇ C.
• the content of component (C) in the dental porcelain paste is not particularly limited, but for example, from the viewpoint of making it easier to increase the values of ⁇ E * , ⁇ L * , and ⁇ E1 * , component (A) and component (B), preferably 0.001 parts by mass or more, more preferably 0.002 parts by mass or more, still more preferably 0.004 parts by mass or more, even more preferably 0.010 parts by mass. Parts by mass or more, and preferably 0.60 parts by mass for a total of 100 parts by mass of component (A) and component (B), for example, from the viewpoint of suppressing the occurrence of bubbles and carbonization in the fired body.
• the amount is less than 0.50 parts by weight, more preferably 0.40 parts by weight or less, even more preferably 0.30 parts by weight or less.
• the content of component (C) in the dental porcelain paste is preferably 0.001 parts by mass based on a total of 100 parts by mass of component (A) and component (B). Parts by mass or more and less than 0.60 parts by mass, more preferably 0.002 to 0.50 parts by mass, even more preferably 0.004 to 0.40 parts by mass, even more preferably 0.010 to 0.30 parts by mass. be.
• the total content of component (A), component (B), and component (C) in the dental porcelain paste is 100% of the dental porcelain paste.
• the mass% preferably 90% by mass or more, more preferably 95% by mass or more, still more preferably 98% by mass or more, even more preferably 99% by mass or more, even more preferably 99.5% by mass or more, and , 100% by mass or less.
• these lower and upper limits described in stages can be independently combined.
• the total content of component (A), component (B), and component (C) in the dental porcelain paste is preferably 100% by mass of the dental porcelain paste. is 90 to 100% by weight, more preferably 95 to 100% by weight, even more preferably 98 to 100% by weight, even more preferably 99.5 to 100% by weight.
• the porcelain paste further contains a fluorescent agent.
• the type of fluorescent agent is not limited as long as the effects of the present invention can be achieved, and examples thereof include Y 2 SiO 5 :Ce, Y 2 SiO 5 :Tb, (Y, Gd, Eu) BO 3 , Y Examples include 2O3 : Eu, YAG :Ce, ZnGa2O4 :Zn, BaMgAl10O17 :Eu, and the like .
• These fluorescent agents can be used alone or in an appropriate combination of two or more.
• the content of the fluorescent agent is not particularly limited as long as the effect of the present invention can be achieved, but for example, from the viewpoint of making it easier to express the fluorescence of natural teeth, Preferably 0.001 parts by mass or more, more preferably 0.010 parts by mass or more, still more preferably 0.050 parts by mass or more, even more preferably 0.10 parts by mass or more, and preferably 0.50 parts by mass or less, more preferably 0.45 parts by mass or less, even more preferably 0.40 parts by mass or less, even more preferably 0.35 parts by mass or less. It is. As described above, these lower and upper limits described in stages can be independently combined.
• the content of the fluorescent agent in the dental porcelain paste is preferably 0.001 to 0 with respect to a total of 100 parts by mass of component (A) and component (B). .50 parts by weight, more preferably 0.010 to 0.45 parts by weight, still more preferably 0.050 to 0.40 parts by weight, even more preferably 0.10 to 0.35 parts by weight.
• the porcelain paste may further contain an inorganic pigment.
• the type of inorganic pigment is not limited as long as the effects of the present invention are achieved, and examples thereof include praseodymium oxide, vanadium oxide, iron oxide, nickel oxide, chromium oxide, manganese oxide, cerium oxide, and tin oxide compounds (for example, complex oxides containing tin(II) oxide and tin(IV) oxide (e.g. vanadium tin yellow, chromium tin pink, etc.), bismuth vanadium yellow, vanadium zirconium yellow, praseodymium yellow, cobalt blue, manganese pink.
• chromium alumina pink chromium iron zinc, titanium oxide (TiO 2 ), zirconium oxide (ZrO 2 ), zirconium silicate (ZrSiO 4 ), and the like.
• These inorganic pigments can be used alone or in an appropriate combination of two or more.
• the content of the inorganic pigment is not particularly limited as long as the effects of the present invention are achieved, but for example, a total of 100 parts by mass of component (A) and component (B). , preferably 0.001 parts by mass or more, more preferably 0.010 parts by mass or more, still more preferably 0.050 parts by mass or more, even more preferably 0.10 parts by mass or more, and preferably The amount is 0.50 parts by mass or less, more preferably 0.45 parts by mass or less, even more preferably 0.40 parts by mass or less, even more preferably 0.30 parts by mass or less. As described above, these lower and upper limits described in stages can be independently combined.
• the content of the inorganic pigment in the dental porcelain paste is preferably 0.001 to 0 with respect to a total of 100 parts by mass of component (A) and component (B). .50 parts by weight, more preferably 0.010 to 0.45 parts by weight, still more preferably 0.050 to 0.40 parts by weight, even more preferably 0.10 to 0.30 parts by weight.
• the fluorescent agent and the inorganic pigment that may be optionally included in the porcelain paste may contain the following ingredients.
• other components include water, colorants other than component (C), emulsifiers, pH adjusters, polymerization accelerators, and polymerization initiators.
• the dental porcelain paste that is one aspect of the present invention may customarily be contaminated with water during its use.
• water that is customarily mixed in when the dental porcelain is used can be used in the dental porcelain that is one aspect of the present invention. Not considered as a component of the paste. That is, the water that is unintentionally introduced into the porcelain paste during use is different from the water in the other components.
• the method for producing a dental porcelain paste which is one aspect of the present invention, includes, for example, at least the above-mentioned components (A), (B), and (C), and may be added as necessary.
• a manufacturing method including a step of mixing one or more selected from the fluorescent agent, inorganic pigment, and other components may be mentioned.
• the mixing conditions are not particularly limited, and the components to be contained may be added all at once or may be added in portions.
• a common kneader can be used for mixing. Examples include a mortar, a twin-screw kneader (twin mix), a three-screw kneader (trimix), a kneader, and a planetary mixer. Among these, it is preferable to use a mortar or a planetary mixer.
• the porcelain paste can be used, for example, to produce dental prostheses such as ceramic inlays, onlays, laminate veneers, and crowns. Further, the usage of the porcelain paste is not particularly limited, and examples thereof include body porcelain (dentine colored porcelain), ceramic porcelain, incisal porcelain (enamel colored porcelain), translucent porcelain, and opaque porcelain. It can be used as porcelain, stain porcelain, glaze porcelain, etc.
• the dental porcelain paste that is one aspect of the present invention has a large color tone difference from the material used for the dental porcelain that serves as the base, so even when visually inspected, the porcelain paste applied to the base is It is easy to distinguish between paste-applied areas and unapplied areas.
• the dental porcelain paste that is one aspect of the present invention further has the advantage that, after firing, the coloring derived from component (C) disappears, and there is almost no difference in color from the base, so the color tone of the base is It also has the effect of suppressing the generation of bubbles and sunspots. Therefore, the dental porcelain paste that is one embodiment of the present invention is suitable for applications that require even greater distinguishability in the application work before firing. Therefore, as described above, the porcelain paste is preferably used mainly as a stain porcelain or a glaze porcelain used as a finish for a ceramic prosthesis, and more preferably as a glaze porcelain.
• the porcelain paste when used as a glaze porcelain, it is preferably used for finishing a dental prosthesis formed from the above-mentioned ceramic material.
• typical examples of dental prostheses formed from the ceramic material include PFM type, PFZ type, FCZ type, and LDS type.
• the FCZ type has a zirconia surface, so it cannot achieve a self-glazing effect, so for glazing it is necessary to apply porcelain paste at a certain thickness (for example, 20 ⁇ m or more). need to be applied.
• the porcelain paste has excellent discrimination ability and the coating thickness can be easily adjusted. It can be suitably used for.
• a dental porcelain paste for treating teeth e.g., cosmetic dental treatment, treatment of missing teeth, prosthetic restoration treatment such as artificial teeth, caries treatment, etc.
• teeth e.g., cosmetic dental treatment, treatment of missing teeth, prosthetic restoration treatment such as artificial teeth, caries treatment, etc.
• the above-mentioned porcelain pastes can be used alone or in an appropriate combination of two or more types, as long as the effects of the present invention are achieved.
• a dental porcelain kit that is one aspect of the present invention includes the dental porcelain paste that is one aspect of the present invention described above, and a color sample for matching the coating thickness of the dental porcelain paste.
• the dental porcelain paste included in the dental porcelain kit is the same as that described in the section of the dental porcelain paste, and its preferred embodiments are also the same.
• the color sample for matching the coating thickness of the dental porcelain paste is based on the color tone of the coating film when the dental porcelain paste before firing is applied to a specific base, and the coating thickness of the porcelain paste is determined based on the color tone of the coating film when the dental porcelain paste is applied to a specific base.
• An example of the color sample is one that allows the user to visually check the color tone when the porcelain paste is applied to a specific base material, such as a zirconia base material, at a specific thickness. If so, there are no particular restrictions.
• the user of the porcelain paste can reproduce the color tone that would be obtained when the porcelain paste is applied to a specific base with a specific thickness so that the user can visually confirm the color tone of the porcelain paste on paper or plastic. It may be a colored plate, a metal plate, a ceramic plate, etc., or it may actually be a photograph or an actual sample of the porcelain paste of each coating thickness.
• One aspect of the color sample is, for example, when the porcelain paste is applied to a base in a range of 20 to 40 ⁇ m, within that range, a certain thickness interval (for example, a thickness of 20 ⁇ m) is used.
• the porcelain paste is applied to each thickness range (for example, the color tone when the thickness is 25 ⁇ m, the color tone when the thickness is 25 ⁇ m) or the color tone when the thickness is 25 ⁇ m to 25 ⁇ m, and the color tone when the thickness is 25 ⁇ m.
• One example is one that allows the user to visually check the color tone when the color changes. Further, there is no particular restriction on the base material for producing the color sample.
• the porcelain paste is applied to the zirconia base material to a specific thickness, and the color sample that can be used to confirm the color tone of the surface of the coating film formed is used. All you need to do is make a color sample.
• a method for manufacturing a dental prosthesis which is one aspect of the present invention, includes a step (I) of applying the above-described dental porcelain paste, which is one aspect of the present invention, to a base material; It includes a step (II) of firing the dental porcelain paste.
• the dental porcelain paste is applied to the base material.
• the dental porcelain paste used in step (I) is the same as that described in the section of the dental porcelain paste, and its preferred embodiments are also the same.
• the "substrate" (base material) to which the porcelain paste is applied is not particularly limited, and can be appropriately selected depending on the use of the porcelain paste.
• the porcelain paste is used as a glaze porcelain, it is preferably used for finishing the dental prosthesis made of the above-mentioned ceramic materials, and the base material for the dental prosthesis made of these ceramic materials is zirconium oxide (zirconia). Examples include aluminum oxide (alumina), feldspathic glass, and lithium disilicate glass.
• the porcelain paste is applied to a certain thickness (for example, 20 ⁇ m or more) for glazing.
• the porcelain paste has excellent discrimination ability, and the coating thickness can be easily adjusted. Therefore, the porcelain paste can be suitably used for a base material made of zirconia.
• the shape of the base material there is no particular restriction on the shape of the base material.
• the porcelain paste is used as a glaze porcelain material, as described above, it is preferable to use it for finishing a dental prosthesis made of ceramic material.
• the shape is also processed into the shape of a dental prosthesis.
• step (I) the method of applying (adhering) the porcelain paste to the base material can be performed using, for example, a brush or brush. Further, depending on the type of the porcelain paste, spraying can also be used. Furthermore, the base material can also be immersed in a container filled with the porcelain paste, and in that case, it is preferable to seal the base material in advance so that the coating agent does not flow into the inner surface of the base material.
• the thickness of the coating film formed by applying the porcelain paste can be set as appropriate depending on the application, but for example, when the porcelain paste is used as a glazed porcelain, the resulting fired body has a certain thickness.
• the thickness is preferably 10 ⁇ m or more, more preferably 15 ⁇ m or more, and still more preferably 20 ⁇ m or more, because it becomes easier to create a gloss.
• step (I) it is preferable to use the sample for adjusting the coating thickness of the dental porcelain paste described in the section of the dental porcelain kit. That is, in step (I), it is preferable to use the dental porcelain kit, which is one aspect of the present invention. As described above, by using the sample for adjusting the coating thickness, it becomes easy to adjust the coating thickness to a predetermined thickness even when performing coating work visually or manually.
• the sample for adjusting the applied thickness of the dental porcelain paste preferably used in step (I) is the same as that described in the column of the dental porcelain kit, and the preferred embodiment thereof is also the same.
• step (II) the dental porcelain paste applied to the base material is fired.
• the firing temperature (maximum firing temperature) when firing the porcelain paste can be set as appropriate depending on the type of porcelain, the form of use, the type of base, etc., and component (C) is discolored by firing. There is no particular restriction as long as the temperature is, but it is preferably 700°C or higher, more preferably 720°C or higher, even more preferably 730°C or higher, and preferably 1050°C or lower, more preferably 1000°C or lower, and even more preferably The temperature is 980°C or less. As described above, these lower and upper limits described in stages can be independently combined.
• the firing temperature during step (II) is preferably 700 to 1050°C, more preferably 720 to 1000°C, and still more preferably 730 to 980°C.
• the heating temperature during firing up to the maximum firing temperature can be changed as appropriate depending on the type of porcelain, and is not particularly limited, but is preferably 10 to 70°C/min, more preferably 15 to 60°C/min, and Preferably it is 20 to 50°C/min.
• the porcelain paste may be dried before firing, and the drying conditions are not particularly limited. Furthermore, the above-mentioned firing is performed under a vacuum because the air bubbles present inside the glass powder (A) are significantly reduced, resulting in a dental prosthesis with better transparency and better aesthetics. It is also possible to carry out vacuum firing.
• the degree of vacuum in vacuum firing is not particularly limited, and may be, for example, 750 mmHg or less, or 730 mmHg or less.
• the temperature at which evacuation is started is not particularly limited, and may be, for example, 550 to 700°C. Further, when performing vacuum firing, heating may be performed under vacuum conditions when the temperature is raised, and when the maximum firing temperature is reached, it may be opened to atmospheric pressure and moored under atmospheric pressure conditions.
• the present invention includes embodiments in which the above configurations are combined in various ways within the scope of the technical idea of the present invention as long as the effects of the present invention are achieved.
• Amorphous type potassium aluminosilicate glass frit consisting of SiO 2 , Al 2 O 3 , ZnO, K 2 O, Na 2 O, Li 2 O, CaO, MgO, Sb 2 O 3 , CeO 2 , and BaO in a planetary mill
• the powder was pulverized to produce powders having the average particle diameters shown in Tables 1 and 2 below.
• the average particle diameter was determined by volume-based average particle diameter (D50) using a laser diffraction/scattering method.
• the measuring device used was "Microtrac (registered trademark) MT3300II" (manufactured by Microtrac Bell Co., Ltd.), and water was used as the dispersion medium.
• Examples 1 to 14 and Comparative Example 1 The components listed in Tables 1 and 2 below are mixed in the respective contents (parts by mass) listed in Tables 1 and 2 in a mortar at room temperature (25°C) for about 10 minutes to prepare a dental porcelain paste. was prepared.
• CM-3610A manufactured by Konica Minolta Co., Ltd., D65 light source, geometric condition c (di: 8°, de: 8°), diffused illumination: 8°
• CM-3610A manufactured by Konica Minolta Co., Ltd., D65 light source, geometric condition c (di: 8°, de: 8°), diffused illumination: 8°
• Each porcelain paste was vacuum fired at a maximum firing temperature of 740°C and polished with #1500 abrasive paper to obtain a fired body with an inner diameter of 15 mm and a thickness of 0.5 mm.
• the firing conditions other than the maximum firing temperature are: Drying time before firing: 6 minutes; Firing start temperature: 400°C; Temperature increase rate: 45°C/min; Vacuum starting temperature: 650°C; Degree of vacuum: 720 mmHg; Open to atmospheric pressure when reaching 740°C. (vacuum released) and moored for 1 minute; After mooring, rapidly cooled to room temperature (25° C.).
• a base material under evaluation to be described later was produced.
• a disc shape with a diameter of 19 mm and a thickness of 1.6 mm was cut for dental use from dental zirconia (trade name: "KATANA (registered trademark) Ziroconia STML A3", thickness 14 mm, manufactured by Kuraray Noritake Dental Co., Ltd.) as a sample.
• a molded article was produced by cutting using a processing machine DWX-51D (manufactured by Roland DG Co., Ltd.). Next, using a firing furnace manufactured by SK Medical Electronics Co., Ltd.
• the molded product was fired in the atmosphere from room temperature (25°C), and then The temperature was raised to 1550°C at a temperature rate of 10°C/min, baked at 1550°C for 2 hours (air baking), and polished with #1500 abrasive paper to form a disc with a diameter of 14 mm and a thickness of 1.2 mm.
• a base material made of a zirconia sintered body was produced.
• CM-3610A manufactured by Konica Minolta, Inc., D65 light source, geometric condition c (di: 8°, de: 8°), diffused illumination: 8° light reception.
• L * a * b * value on a white background JIS Z 8781-4:2013 Colorimetry - Part 4: CIE 1976 L * a * b * Color space
• a stainless steel ring inner diameter 15 mm, thickness 0.5 mm was placed on the base material, and each prepared porcelain paste was placed inside the ring.
• “A” Comparing with conventional dental porcelain, the number of bubbles is the same, and no sunspots are observed.
• B Compared to conventional dental porcelain, there are many bubbles, but there is no problem with practicality, and no sunspots are observed.
• “F” Compared to conventional dental porcelain, there are problems with clearly a large number of bubbles, black spots, or both.
• CM-3610A manufactured by Konica Minolta, Inc., D65 light source, geometric condition c (di: 8°, de: 8°), diffused illumination: 8° light reception.
• L * a * b * value on a white background JIS Z 8781-4: 2013 Colorimetry - Part 4: CIE 1976 L * a * b * Color space
• each porcelain paste prepared so that the thickness of the fired body after firing would be 65 ⁇ m was applied to the base material prepared above, and then vacuum firing was performed at a maximum firing temperature of 740°C to obtain a fired body. Ta.
• the firing conditions other than the maximum firing temperature are: Drying time before firing: 6 minutes; Firing start temperature: 400°C; Temperature increase rate: 45°C/min; Vacuum starting temperature: 650°C; Degree of vacuum: 720 mmHg; Open to atmospheric pressure when reaching 740°C. (vacuum released) and moored for 1 minute; After mooring, rapidly cooled to room temperature (25° C.).
• the color of each obtained fired body was measured using a spectrophotometer (“CM-3610A” manufactured by Konica Minolta, Inc.) under the same conditions as above (L * a * b * color system), and the obtained results were The color tones of the fired bodies were L5 * , a5 * , and b5 * .
• ⁇ E2 * ⁇ (L5 * - L3 * ) 2 + (a5 * - a3 * ) 2 + (b5 * - b3 * ) 2 ⁇ 1/2
• the porcelain pastes of Examples 1 to 14 containing components (A) to (C) and satisfying at least one condition selected from condition (1) and condition (2) are as follows: It can be seen that the color difference ⁇ E1 * between the porcelain paste in the state before firing and the base material coated with the paste is large, and the distinguishability in the application work before firing is excellent. Furthermore, after firing the porcelain pastes of Examples 1 to 14, the color difference ⁇ E2 * between the fired body obtained by firing the porcelain paste and the base material becomes small, and the color tone of the base material becomes smaller. It can be seen that there is almost no effect on Furthermore, the porcelain pastes of Examples 1 to 13 had the same level of air bubbles and no black spots as compared to conventional dental porcelains.
• the porcelain paste of Example 14 had more air bubbles in the fired product than conventional dental porcelains, but this was enough to cause no practical problems, and no black spots were observed. Therefore, it can be seen that the dental porcelain paste, which is one aspect of the present invention, is suitable for applications that require even greater distinguishability in the application work before firing.
• the dental porcelain paste which is one aspect of the present invention, has a large color tone difference with the underlying base material before firing, so it is difficult to visually distinguish between the areas to which the porcelain paste has been applied and the areas to which it has not been applied. Easy to distinguish. Therefore, the dental porcelain paste that is one aspect of the present invention can avoid the occurrence of uncoated porcelain paste, and it is easy to adjust the coating thickness, so it has excellent distinguishability in the application work before firing. .
• the dental porcelain paste which is an aspect of the present invention, changes color tone after firing and almost eliminates color difference from the base material, so it has almost no effect on the color tone of the base material, and it is free from air bubbles and sunspots.
• the dental porcelain paste that is one embodiment of the present invention can be suitably used as a glaze porcelain material, for example.
• the demand for ceramic prosthetics has been increasing, and dental porcelain is expected to be used more frequently as individual aesthetic requirements have increased.
• the dental porcelain paste which is one aspect of the present invention is also useful.

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• 2023
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