Classifications

• • 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
  • A61K6/824—Preparations for artificial teeth, for filling teeth or for capping teeth comprising ceramics comprising transition metal oxides
• • 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
• • 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
  • A61K6/70—Preparations for dentistry comprising inorganic additives
  • A61K6/71—Fillers
  • A61K6/77—Glass
• • 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
  • 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

Definitions

• the present invention relates to a 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. Powdered porcelain is complicated because it is necessary to mix a solvent each time it is operated, and skill is required to adjust the mixing ratio and viscosity according to the desired color tone. Porcelain is pre-mixed with a solvent to a viscosity that allows dental technicians to work with ease, reducing the time required for dental technician work.
• Patent Document 1 discloses that synthesis and/or Discloses a dental paste porcelain containing a dissolved component of a polymeric material having a natural hydrophilic group, which is stable even during long-term storage and difficult to dry and harden during use. has been done.
• Patent Document 2 discloses a dental paste material characterized by containing a dental porcelain, a solvent, and 0.1 to 20% by weight of inorganic powder with an average particle size of 5 to 50 nm. It is disclosed that the dental porcelain does not precipitate even after long-term storage and has excellent workability.
• Patent Document 3 discloses that glass powder containing hydrophobized fine particle silica having a specific average primary particle diameter and having a controlled particle diameter, and an organic solvent having a specific boiling point are each included in specific amounts.
• a dental paste porcelain material that can maintain a paste state for a long period of time, has excellent applicability, and hardly generates carbonization or bubbles due to the effects of organic components or polymeric components during firing. A material paste is disclosed.
• the porcelain changes color to black or gray during porcelain firing, so it was found that there is room for improvement in aesthetics.
• the dental paste material described in Patent Document 2 the dental paste material is colored by the inorganic fine powder, and there is a concern that the aesthetics may be deteriorated.
• the present invention when stored for a long period of time, the glass powder and the solvent separate, and the solidified sediment layer cannot be mixed, making it difficult to reproduce the coating properties immediately after the dental paste is prepared. proved difficult. Therefore, the present invention is capable of suppressing discoloration and deterioration of transparency after firing, does not solidify even when stored for a long period of time, and easily returns to the state immediately after producing the dental porcelain paste.
• the purpose of the present invention is to provide a dental porcelain paste that can be used for dental purposes.
• the present inventor solved the above problem by using a dental porcelain paste containing a cationic surfactant (A), a glass powder (B), and an alcohol (C). They have discovered that it is possible to do so, and have completed the present invention.
• the present invention includes the following inventions.
• the content of component (C) is 20 to 60 parts by mass based on a total of 100 parts by mass of component (B) and component (C). material paste.
• the dental porcelain paste does not solidify and can be easily returned to the state immediately after it was prepared.
• 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 “easiness of restoring” refers to the term “easiness of restoring” that does not solidify even when the dental porcelain paste is stored for a long period of time, and that the dental porcelain paste can be easily restored by stirring or the like. Refers to the property of being able to return to the state immediately after it was created. Specifically, it refers to characteristics evaluated by the method described in Examples. Furthermore, in this specification, unless otherwise specified, the term “appearance” refers to "discoloration” and “transparency” when the dental porcelain paste is fired. Specifically, it refers to characteristics evaluated by the method described in Examples.
• the dental porcelain paste that is one aspect of the present invention contains a cationic surfactant (A) (hereinafter also simply referred to as “component (A)”), a glass powder (B) (hereinafter simply referred to as “component (B)”), and a glass powder (B) (hereinafter simply referred to as “component (B)”). ), and alcohol (C) (hereinafter also simply referred to as “component (C)”).
• component (A) cationic surfactant
• component (B) glass powder
• component (B) glass powder
• component (C) hereinafter also simply referred to as “component (C)”
• the dental porcelain paste can exhibit the above-mentioned effects by containing the components (A) to (C).
• the hydrophilic group of the cationic surfactant (A) has a high silica content and is easily adsorbed on the surface of the negatively charged glass powder (B), and the cationic surfactant (A) is adsorbed on the glass powder (B).
• the surface of powder (B) is made hydrophobic.
• Hydrophobized glass powder (B) becomes a loose aggregate of particles in a hydrophilic liquid such as alcohol (C), so even if a sediment layer forms when stored for a long time, it will not settle. It is presumed that the layers do not solidify, and that even when dental porcelain paste is used again after long-term storage, it can be easily mixed by stirring, etc., and that it is possible to return the dental porcelain paste to the state immediately after it was made. .
• the cationic surfactant (A) is adsorbed on the surface of the glass powder (B), it does not mean that it is bound to the surface of the glass powder (B), so after baking, organic components derived from the cationic surfactant (A) is not left on the surface of the glass powder (B), it is possible to suppress carbonization and generation of bubbles during firing, and it is presumed that discoloration and deterioration of transparency after firing can be suppressed.
• Each component contained in the dental porcelain paste that is one embodiment of the present invention will be described below.
• the cationic surfactant (A) is not limited in type as long as the effects of the present invention are achieved, and examples thereof include alkyltrimethylammonium salts, dialkyldimethylammonium salts, alkylbenzyldimethylammonium salts, alkylammonium salts, Examples include ammonium salts having an alkyl group such as alkylpyridinium salts.
• the alkyl group is preferably an alkyl group having 8 to 18 carbon atoms, and examples of such component (A) include alkyl (8 to 18 carbon atoms) trimethylammonium salt, dialkyl (8 to 18 carbon atoms) dimethyl Examples include ammonium salts, alkyl (8 to 18 carbon atoms) benzyldimethylammonium salts, and alkyl (8 to 18 carbon atoms) pyridinium salts.
• alkyl groups having 8 to 18 carbon atoms from the viewpoint of ease of decomposition, alkyl groups having 8 to 16 carbon atoms are more preferred, and alkyl groups having 8 to 14 carbon atoms are even more preferred.
• Component (A) can be used alone or in an appropriate combination of two or more.
• alkyl groups such as alkyltrimethylammonium ion, dialkyldimethylammonium ion, alkylbenzyldimethylammonium ion, alkylammonium ion, alkylpyridinium ion, etc. that can constitute the above-mentioned salt.
• alkyl groups such as alkyltrimethylammonium ion, dialkyldimethylammonium ion, alkylbenzyldimethylammonium ion, alkylammonium ion, alkylpyridinium ion, etc.
• examples include ammonium ions having Examples of the anion constituting the salt include chloride ion (Cl ⁇ ), bromide ion (Br ⁇ ), and the like.
• the anion is preferably a chloride ion from the viewpoint of ease of decomposition.
• Component (A) consisting of a combination of the above-mentioned anions and cations includes, for example, cetylpyridinium chloride, lauryltrimethylammonium chloride, dodecylpyridium chloride, trimethylstearylammonium chloride, dimethyldioctadecylammonium chloride, benzyldimethyltetradecyl chloride.
• Preferred examples include chlorides such as ammonium; bromides such as lauryltrimethylammonium bromide and trimethylstearylammonium bromide; and the like.
• At least one selected from the group consisting of cetylpyridinium chloride, lauryltrimethylammonium chloride, dodecylpyridium chloride, and lauryltrimethylammonium bromide is more preferred. Further, from the viewpoint of ease of decomposition and availability, the above-mentioned chlorides are preferred.
• Component (A) is preferably one that has good decomposability during firing, and for example, the decomposability during firing can be evaluated by measuring the ignition residue (remaining ratio after firing at 400°C for 1 hour).
• the ignition residue of component (A) is preferably 8.0% or less, more preferably 5.0% or less, even more preferably 1.0% or less, even more preferably 0.5% or less. .
• the ignition residue of the component (A) can be measured by the method described in the Examples. In other words, in one embodiment of component (A), the ignition residue of component (A) is preferably 0.0 to 8.0%, more preferably 0.0 to 5.0%, even more preferably is 0.0 to 1.0%, more preferably 0.0 to 0.5%.
• the content of component (A) is preferably 0.0005 to 2.0 parts by mass based on 100 parts by mass of component (B).
• the content of component (A) is 0.0005 parts by mass or more per 100 parts by mass of component (B)
• the ease of stirring of the dental porcelain paste is further improved even after long-term storage. This is preferable because it improves the ease of restoration.
• the content of component (A) is 2.0 parts by mass or less per 100 parts by mass of component (B)
• discoloration of the glass when firing the dental porcelain paste can be easily suppressed. Therefore, it is preferable.
• the content of component (A) is more preferably 0.001 to 1.5 parts by mass, and even more preferably 0.003 to 1.2 parts by mass, per 100 parts by mass of component (B). parts, more preferably 0.008 to 0.8 parts by weight, even more preferably 0.01 to 0.5 parts by weight, even more preferably 0.05 to 0.3 parts by weight.
• component (A) is more easily thermally decomposed than polymeric materials, and even when added in a small amount, it has the effect of preventing the sedimentation layer that occurs when dental porcelain paste is stored for a long period of time from solidifying, as described above. is easy to obtain. Therefore, in addition to the ease of restoring the dental porcelain paste after long-term storage, it also makes it easier to suppress carbonization and the generation of bubbles when the dental porcelain paste is fired, further reducing the appearance after firing. It is presumed that this can be suppressed. Furthermore, as mentioned above, although component (A) is adsorbed on the surface of component (B), it is not directly bonded to it, so organic substances derived from component (A) remain on the glass surface after firing. It is presumed that the fact that it is hard to wear is also a factor in suppressing the deterioration in appearance.
• the glass powder (B) is not particularly limited, and is preferably one that can be used for dental purposes, and may contain crystals.
• Examples of the material for the glass powder (B) 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 glass powder (B) can be used alone or in an appropriate combination of two or more.
• the glass raw material which is the material of the glass powder (B) a wide range of commonly used ceramic raw materials can be used, such as SiO 2 , Al 2 O 3 , B 2 O 3 , ZnO, Oxides such as K 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 when heated in the atmosphere
• Substances that can become the above-mentioned oxides such as 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 , BaO, SnO 2 or a mixture of each of the above oxides and a substance that can become each of the above oxides when heated in the atmosphere; etc.
• the glass composition obtained in advance is determined by calculation, and the formulation of each raw material is determined and mixed
• 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 glass powder (B) 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 (B) 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. Further, it is preferable that the average particle diameter is 30 ⁇ m or less because it facilitates improving the ease of restoring the dental porcelain paste.
• the average particle size of component (B) 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 (B) 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 (B) is preferably 500 to 680°C, more preferably 520 to 650°C, and still more preferably 550 to 630°C. It is preferable that the glass transition temperature is 400° C. or higher, or that the softening point is 500° C. or higher, since component (B) can be prevented from dripping during firing.
• 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, so that high-temperature firing allows for the production of lithium disilicate-based glass ceramics, etc. This is preferable because deformation of the ceramic frame can be avoided.
• the coefficient of linear thermal expansion (50 to 500°C) of component (B) can be appropriately selected depending on the material of the abutment tooth or the material of the frame, 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 expansion coefficient of component (B) is preferably 9.0 ⁇ 10 ⁇ 6 to 11.0 ⁇ 10 ⁇ 6 /°C. .
• the linear expansion coefficient of component (B) 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 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.
• component (B) is preferably 40 to 80 parts by mass, more preferably 45 to 75 parts by mass, and even more preferably 48 to 72 parts by mass, based on a total of 100 parts by mass of component (B) and component (C). Department.
• Alcohol (C) examples include 1,2-ethanediol, 1,2-propanediol, 1,3-propanediol, 1,2-butanediol, 1,3-butanediol, and 1,4-butanediol.
• Component (C) is preferably an alcohol that is liquid at 20°C.
• the boiling point of component (C) is preferably 100 to 300°C, more preferably 100 to 250°C, and even more preferably 100 to 230°C.
• component (C) preferably contains a dihydric alcohol, such as 1,2-propanediol, 1,3-butanediol, 1,4-butanediol, 1-methyl-1,3-propanediol, 2 -Methyl-1,3-propanediol, 2-methyl-1,4-butanediol, 3-methyl-1,3-butanediol, 2-methyl-2,4-pentanediol, 3-methyl-1,5 - It is more preferable to contain at least one selected from the group consisting of pentanediol, 2,4-diethyl-1,5-pentanediol, and 2-ethyl-1,3-hexanediol, and 1,2-propane Contains at least one member selected from the group consisting of diol, 1,3-butanediol, 1,4-butanediol, 3-methyl-1,5-pentaned,
• component (C) the content of dihydric alcohol 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 the total amount of 100% by mass of component (C). and may be 100% by mass.
• the content of component (C) is not particularly limited, but is preferably 20 to 60 parts by mass, more preferably 25 to 55 parts by mass, and more preferably 25 to 55 parts by mass, based on a total of 100 parts by mass of component (B) and component (C). Preferably it is 28 to 52 parts by mass. It is preferable that the content of component (C) is 20 parts by mass or more because the kneading properties of component (B) and component (C) are improved and it becomes easier to form a paste. Moreover, it is preferable that the content of the component (C) is 60 parts by mass or less because it is easy to ensure the amount of the glass component in the dental porcelain paste and it is easy to perform the porcelain building up sufficiently.
• the total content of component (A), component (B), and component (C) in the dental porcelain paste is 100% by mass of the dental porcelain paste. %, preferably 75% by mass or more, more preferably 80% by mass or more, still more preferably 90% by mass or more, even more preferably 95% by mass or more, and 100% by mass or less. In other words, in one embodiment of the dental porcelain paste, the total content of component (A), component (B), and component (C) in the dental porcelain paste is 100% of the dental porcelain paste. Of the mass%, it is preferably 75 to 100% by mass, more preferably 80 to 100% by mass, even more preferably 90 to 100% by mass, even more preferably 95 to 100% by mass.
• the dental porcelain paste may further contain other components (arbitrary components) as necessary, as long as they do not impede the effects of the present invention.
• other components include water, colorants, pH adjusters, polymerization accelerators, and polymerization initiators.
• the colorant may be amorphous or crystalline.
• the coloring agent include pigments such as inorganic pigments and emulsifiers, and coloring agents that decolorize during firing.
• the inorganic pigments include praseodymium oxide, vanadium oxide, iron oxide, nickel oxide, chromium oxide, manganese oxide, cerium oxide, and tin oxide compounds (for example, compounds containing tin(II) oxide and tin(IV) oxide).
• Composite oxides e.g. vanadium tin yellow, chromium tin pink, etc.
• Examples of the emulsion material include zirconium silicate, tin(IV) oxide, zirconium oxide (ZrO 2 ), zinc oxide, titanium oxide (TiO 2 ), and aluminum oxide. These are included as appropriate depending on the desired color tone, and when a white color tone is desired, it is preferable to add 5 to 20% by mass of zirconium silicate.
• examples of the coloring agent that decolorizes during baking include food coloring that dissolves in organic solvents. Food colors include Yellow No. 4 (Tartrazine), Yellow No. 5 (Sunset Yellow FCF), Red No. 2 (Amaranth), Red No. 102 (New Coccin), Blue No. 1 (Brilliant Blue FCF), and Blue No. 2.
• Organic dyes containing two or more aromatic groups such as (Indigo Carmine), Green No. 3 (Fast Green FCF), Red No. 102 (New Coccin); Acid Red 289, Bromopyrogallol Red, Rhodamine B, Rhodamine 6G, Rhodamine 6GP, Rhodamine 3GO, Rhodamine 123, eosin, eosin B, eosin Y, fluorescein, fluorescein isothiocyanate, and other organic dyes containing xanthene-based condensed aromatic groups (xanthene dyes); cochineal dyes (carminic acid Pigments): Examples include betalain pigments such as beet red (main components: isobetanin and betanin), betanin, isobetanin, probetanin, and neobetanin.
• betalain pigments such as beet red (main components: isobetanin and betanin
• a preferred method for manufacturing the dental porcelain paste that is one aspect of the present invention includes a manufacturing method that includes at least the step of mixing the component (A), component (B), and component (C).
• 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 dental porcelain paste preferably does not substantially contain photocurable resin.
• the phrase "substantially free of photocurable resin” means that the photocurable resin is 3% by mass or less, preferably 1% by mass or less in 100% by mass of the dental porcelain paste. , more preferably 0.1% by mass or less, still more preferably 0.05% by mass or less.
• the content of the photocurable resin is preferably 0 to 3% by mass, more preferably 0 to 1% by mass, and more preferably 0 to 1% by mass, based on 100% by mass of the dental porcelain paste. Preferably it is 0 to 0.1% by weight, even more preferably 0 to 0.05% by weight.
• the dental porcelain paste that is one embodiment of the present invention does not contain a photocurable resin, that is, it contains 0% by mass.
• the photocurable resin is, for example, a resin that is cured by energy rays such as X-rays, ultraviolet rays, and visible light.
• the photocurable resin include radical polymerization type photocurable resins such as urethane acrylate and epoxy acrylate resins, and cationic polymerization type photocurable resins such as epoxy resins.
• the content of the organic polymeric material having a hydrophilic group in the dental porcelain paste may be less than 0.5% by mass based on 100% by mass of the dental porcelain paste. , 0.3% by mass or less, or 0.1% by mass or less.
• the content of the organic polymeric material having a hydrophilic group may be 0 to 0.5% by mass in 100% by mass of the dental porcelain paste, and may be 0 to 0.5% by mass. It may be 0.3% by mass, or 0-0.1% by mass.
• the organic polymer material may be, for example, an organic compound having a weight average molecular weight of 1,000 or more, and the weight average molecular weight is, for example, a value determined by gel permeation chromatography in terms of standard polystyrene. Can be used.
• the dental porcelain paste that is one aspect of the present invention only needs to be in the form of a paste that can be built up during use, for example, a liquid component (first agent) containing component (A) and component (C) can be used. It is provided as a dental porcelain kit consisting of a powder component (second agent) containing component (B), and the user mixes the first agent and the second agent immediately before use to create a dental porcelain paste.
• a part of component (C) can be packaged, for example, a pre-paste containing component (A), component (B) and a part of component (C), and component (
• the remainder of component (C) may be provided as a dental porcelain kit consisting of the remainder of component (C), and the user may add the remainder of component (C) to the pre-paste immediately before use and use it as the dental porcelain paste. good.
• the type, content, etc. of each component can be changed as appropriate based on the above explanation, and any component can be added, deleted, etc.
• the dental porcelain paste that is one aspect of the present invention is provided as a dental porcelain kit
• the dental porcelain paste must satisfy the requirements when used as the dental porcelain paste.
• at least one of the agents constituting the kit may already meet the requirements of the dental porcelain paste, or only by mixing each agent can the dental porcelain paste be satisfied.
• the composition of each agent may be designed to meet the requirements.
• the dental porcelain paste that is one embodiment of the present invention can be used, for example, to produce dental prostheses such as ceramic inlays, onlays, laminate veneers, and crowns.
• the frame to which the dental porcelain paste that is one aspect of the present invention is applied is not particularly limited, and examples thereof include a metal frame, a ceramic frame (for example, a zirconia frame), and the like.
• the use of the dental porcelain paste is not particularly limited, and examples thereof include body porcelain (dentin-colored porcelain), surgical porcelain, incisal porcelain (enamel-colored porcelain), translucent porcelain, and opaque porcelain. It can be used as porcelain, stain porcelain, etc.
• the firing temperature is not particularly limited as it can be changed as appropriate depending on the type of porcelain, usage form, etc., but is preferably 700°C or higher, more preferably 730°C or higher, and even more preferably 740°C or higher.
• the temperature is preferably 1050°C or lower, more preferably 1000°C or lower, and even more preferably 980°C or lower. As described above, these lower and upper limits described in stages can be independently combined.
• one aspect of the firing temperature is preferably 700 to 1050°C, more preferably 730 to 1000°C, and even more preferably 740 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 even more preferably is 20-50°C/min.
• the dental porcelain paste may be dried before firing after the dental porcelain paste is built up, and the drying conditions are not particularly limited. Furthermore, firing after building up the dental porcelain paste greatly reduces the air bubbles present inside the glass powder (B), resulting in a dental prosthesis with better transparency and better aesthetics.
• Vacuum baking may be performed in a vacuum to obtain good properties.
• the degree of vacuum in vacuum firing is not particularly limited, and may be, for example, 750 mmHg or less.
• the temperature at which evacuation is started is not particularly limited, and may be, for example, 550 to 700°C.
• component (A) and component (B) for treating teeth for example, cosmetic dentistry treatment, treatment of missing teeth, prosthetic restoration treatment such as artificial teeth, caries treatment, etc.
• component (C) for treating teeth for example, cosmetic dentistry treatment, treatment of missing teeth, prosthetic restoration treatment such as artificial teeth, caries treatment, etc.
• teeth for example, cosmetic dentistry treatment, treatment of missing teeth, prosthetic restoration treatment such as artificial teeth, caries treatment, etc.
• component (C) for treating teeth for example, cosmetic dentistry treatment, treatment of missing teeth, prosthetic restoration treatment such as artificial teeth, caries treatment, etc.
• C dental porcelain paste containing component
• each component can be changed as appropriate based on the above explanation, and changes such as addition and deletion of arbitrary components can be made.
• the composition and characteristic values of each dental porcelain paste can be changed and combined as appropriate. Therefore, the dental porcelain pastes described above can be used alone or in an appropriate combination of two or more, as long as the effects of the present invention are achieved.
• 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.
• a dental porcelain paste was prepared by mixing the components listed in Tables 1 to 3 below in the amounts (parts by mass) listed in Tables 1 to 3 in a mortar at room temperature for about 10 minutes.
• the components used are as follows.
• (Cationic surfactant: component (A)) ⁇ Cetylpyridinium chloride monohydrate (manufactured by Fujifilm Wako Pure Chemical Industries, Ltd., white solid) ⁇ Lauryltrimethylammonium chloride (manufactured by Fujifilm Wako Pure Chemical Industries, Ltd., white solid) ⁇ Dodecylpyridinium chloride (manufactured by Fujifilm Wako Pure Chemical Industries, Ltd., white solid) ⁇ Trimethylstearylammonium chloride (manufactured by Tokyo Kasei Kogyo Co., Ltd., white solid) ⁇ Dimethyldioctadecylammonium chloride (manufactured by Fujifilm Wako Pure Chemical Industries, Ltd., white solid) ⁇ Benzyldimethyltetradecylammonium chloride (manufactured by Fujifilm Wako Pure Chemical Industries, Ltd., white solid) ⁇ Lauryltrimethylammonium bromide (manu
• the glass powder is an amorphous type potassium aluminosilicate glass frit consisting of SiO2 , Al2O3 , ZnO, K2O , Na2O , Li2O , CaO , MgO, Sb2O3 , CeO2 , and BaO. was ground in a planetary mill to produce powders having the average particle diameters listed in Tables 1 to 3. 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 (Microtrac Bell Co., Ltd.), and the measurement was carried out using water as a dispersion medium.
• Microtrac registered trademark
• MT3300II Microtrac Bell Co., Ltd.
• ⁇ Evaluation of dental porcelain paste> (1) Evaluation of ease of restoration after standing for a long period of time Weigh out 10g of the dental porcelain paste prepared in the above Examples and Comparative Examples into a 20mL container, and leave it in a constant temperature bath at 60°C for 2 weeks. This was used as a test specimen. After cooling the test specimen after standing for 2 weeks to 23°C, it was stirred by hand with a stainless steel spatula until it became the paste prepared before standing. The time and labor required for stirring were evaluated based on the following criteria. ⁇ Evaluation criteria> A: A stainless steel spatula easily sticks into the specimen, and the specimen returns to the state before being left still within 1 minute after the start of stirring.
• a stainless steel spatula is inserted into the specimen, and the specimen returns to the state before being left still within 3 minutes after starting stirring for more than 1 minute.
• C The stainless steel spatula was difficult to stick into the specimen, and the specimen returned to the state before being left still within 10 minutes after starting stirring for more than 3 minutes.
• D The specimen is solidified to such an extent that a stainless steel spatula cannot be inserted into the test specimen, and even if stirring is continued for more than 10 minutes after the start of stirring, the solidification cannot be loosened and the specimen does not return to the state before being left still.
• B In a sintered body with a thickness of 0.2 mm, the glass does not discolor and has a transparent appearance, but in a sintered body with a thickness of 1.0 mm, the glass changes color to gray and a decrease in transparency is observed.
• C The glass of both the 0.2 mm thick and 1.0 mm thick sintered bodies turned gray, and a decrease in transparency was observed.
• the dental porcelain paste of Comparative Example 2 or Comparative Example 3 containing polyethylene glycol monostearate or hydrophobic fine particle silica instead of component (A) also solidified when stored for a long time, and when stirred with a spatula, It can be seen that the solidification cannot be loosened and the product will not return to its pre-storage condition. Furthermore, it can be seen that in the dental porcelain paste of Comparative Example 4 containing xanthan gum instead of component (A), the appearance after firing was significantly deteriorated. This is presumed to be due to the fact that xanthan gum, a high molecular compound, is not completely incinerated.
• the dental porcelain paste of the present invention can suppress deterioration in appearance during firing, and is also excellent in ease of restoration even when stored for a long period of time. Since the dental porcelain paste of the present invention has excellent ease of restoration even after long-term storage, suitable operability can be reproduced manually by a dental technician. Furthermore, since deterioration in appearance during firing can be suppressed, color tone can be adjusted accurately. Therefore, the dental porcelain paste of the present invention can be used for prosthetic restoration of artificial teeth, etc., which has an aesthetic quality close to that of natural teeth, and can be suitably used during manual construction by dental technicians even after long-term storage. It can be suitably used as a dental porcelain paste. In particular, the dental porcelain paste of the present invention is expected to increase in frequency of use as dental porcelain is expected to be used more frequently as demand for ceramic dental crowns increases and individual aesthetic requirements rise. is useful.

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• Health & Medical Sciences (AREA)
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• Life Sciences & Earth Sciences (AREA)
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• 2023
  • 2023-07-21 JP JP2024537666A patent/JPWO2024024661A1/ja active Pending
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