US20120027829A1 - Dentin mineralizing agent and method for production thereof - Google Patents

Dentin mineralizing agent and method for production thereof Download PDF

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US20120027829A1
US20120027829A1 US13/259,681 US201013259681A US2012027829A1 US 20120027829 A1 US20120027829 A1 US 20120027829A1 US 201013259681 A US201013259681 A US 201013259681A US 2012027829 A1 US2012027829 A1 US 2012027829A1
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weight
parts
agent
particles
dentin
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Tadashi Hashimoto
Mariko Sugiura
Shumei Ishihara
Mitsunobu Kawashima
Koichi Okada
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Kuraray Noritake Dental Inc
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Kuraray Medical Inc
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Assigned to KURARAY MEDICAL INC. reassignment KURARAY MEDICAL INC. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: HASHIMOTO, TADASHI, OKADA, KOICHI, ISHIHARA, SHUMEI, KAWASHIMA, MITSUNOBU, SUGIURA, MARIKO
Publication of US20120027829A1 publication Critical patent/US20120027829A1/en
Assigned to KURARAY NORITAKE DENTAL INC. reassignment KURARAY NORITAKE DENTAL INC. CHANGE OF NAME (SEE DOCUMENT FOR DETAILS). Assignors: KURARAY MEDICAL INC.
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    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K33/00—Medicinal preparations containing inorganic active ingredients
    • A61K33/42—Phosphorus; Compounds thereof
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K33/00—Medicinal preparations containing inorganic active ingredients
    • A61K33/16—Fluorine compounds
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K45/00—Medicinal preparations containing active ingredients not provided for in groups A61K31/00 - A61K41/00
    • A61K45/06—Mixtures of active ingredients without chemical characterisation, e.g. antiphlogistics and cardiaca
    • 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
    • A61K6/80—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
    • A61K6/838—Phosphorus compounds, e.g. apatite
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K8/00—Cosmetics or similar toiletry preparations
    • A61K8/02—Cosmetics or similar toiletry preparations characterised by special physical form
    • A61K8/0241—Containing particulates characterized by their shape and/or structure
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K8/00—Cosmetics or similar toiletry preparations
    • A61K8/18—Cosmetics or similar toiletry preparations characterised by the composition
    • A61K8/19—Cosmetics or similar toiletry preparations characterised by the composition containing inorganic ingredients
    • A61K8/24—Phosphorous; Compounds thereof
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
    • A61P1/00—Drugs for disorders of the alimentary tract or the digestive system
    • A61P1/02—Stomatological preparations, e.g. drugs for caries, aphtae, periodontitis
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
    • A61P25/00—Drugs for disorders of the nervous system
    • A61P25/02—Drugs for disorders of the nervous system for peripheral neuropathies
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61Q—SPECIFIC USE OF COSMETICS OR SIMILAR TOILETRY PREPARATIONS
    • A61Q11/00—Preparations for care of the teeth, of the oral cavity or of dentures; Dentifrices, e.g. toothpastes; Mouth rinses
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K2800/00—Properties of cosmetic compositions or active ingredients thereof or formulation aids used therein and process related aspects
    • A61K2800/40—Chemical, physico-chemical or functional or structural properties of particular ingredients
    • A61K2800/41—Particular ingredients further characterized by their size
    • A61K2800/412—Microsized, i.e. having sizes between 0.1 and 100 microns

Definitions

  • the present invention relates to dentin mineralizing agents for mineralizing a dentin surface and a deep portion of a dentinal tubule.
  • CPC calcium phosphate cement
  • TTCP tetracalcium phosphate
  • DCPA dicalcium phosphate anhydrous
  • Japanese Patent No. 3017536 discloses that a calcium phosphate composition including tetracalcium phosphate and dicalcium phosphate anhydrous reacts in the presence of water to form hydroxyapatite. It has been reported that the thus obtained hydroxyapatite can replace bone gradually when it comes into contact with a biological hard tissue, and the aforementioned calcium phosphate composition is usable as a remineralizing agent because it possesses remineralization potential.
  • an alkali metal salt of phosphoric acid such as disodium hydrogen phosphate (Na 2 HPO 4 )
  • Na 2 HPO 4 disodium hydrogen phosphate
  • an alkali metal salt of phosphoric acid is added for the purpose of improving the effect of mineralization.
  • Patent Document 2 JP 1-163127 A discloses a composition for recovery from hyperesthesia comprising tetracalcium phosphate, calcium phosphate having a Ca/P molar ratio of less than 1.67, and a thickener. This reports that the composition can reduce hyperesthesia when it is applied to a hyperesthetic site of a tooth and held for a prescribed time. The reason for such remarkable reduction in hyperesthesia is believed that calcium ions or phosphate ions eluted from a kneaded mass of such a composition with water or the like diffuse and penetrate into dentinal tubules, then hydroxyapatite deposits in the dentinal tubules, so that external mechanical stimulation, thermal stimulation, and chemical stimulation are intercepted.
  • the present invention was devised in order to solve the above-described problems, and the object thereof is to provide a dentin mineralizing agent by which a dense HAp is formed on a dentin surface and HAp is deposited to a deep portion of a dentinal tubule, so that it can close the dentinal tubule.
  • a dentin mineralizing agent comprising tetracalcium phosphate particles (A) and an alkali metal salt of phosphoric acid (B), wherein the dentin mineralizing agent contains the tetracalcium phosphate particles (A) in an amount of 1 to 80 parts by weight relative to 100 parts by weight of the whole amount of the dentin mineralizing agent, and the blended amount of the alkali metal salt of phosphoric acid (B) relative to 100 parts by weight of the tetracalcium phosphate particles (A) is 1 to 100 parts by weight.
  • the alkali metal salt of phosphoric acid (B) is disodium hydrogen phosphate and/or sodium dihydrogen phosphate
  • the agent further comprises acidic calcium phosphate particles (C).
  • the acidic calcium phosphate particles (C) are at least one member selected from the group consisting of dicalcium phosphate anhydrous [CaHPO 4 ] particles, monocalcium phosphate anhydrous [Ca(H 2 PO 4 ) 2 ] particles, tricalcium phosphate [Ca 3 (PO 4 ) 2 ] particles, amorphous calcium phosphate [Ca 3 (PO 4 ) 2 .xH 2 O] particles, calcium dihydrogen pyrophosphate [CaH 2 P 2 O 7 ] particles, dicalcium phosphate dihydrate [CaHPO 4 .2H 2 O] particles, and monocalcium phosphate monohydrate [Ca(H 2 PO 4 ) 2 .H 2 O] particles, and it is preferred that
  • the agent further comprises a fluorine compound (D), and it is preferred that the fluorine compound (D) is sodium fluoride.
  • the average particle diameter of the tetracalcium phosphate particles (A) is 0.5 to 40 ⁇ m, and it is preferred that an average particle diameter of the alkali metal salt of phosphoric acid (B) is 0.5 to 20 ⁇ m.
  • an average particle diameter of the acidic calcium phosphate particles (C) is 0.1 to 7 ⁇ m, and it is preferred that the agent further comprise particles (E) of 0.002 to 2 ⁇ m in average particle diameter selected from silica or metal oxides.
  • a free alkali metal ion concentration of the suspension at a time of 10 minutes after the adding is 0.2 to 100 mg/L, and it is preferred that a standard deviation a determined when an average of the free alkali metal ion concentration is expressed by d satisfies ⁇ 0.3d and also preferred that the alkali metal ion is a sodium ion.
  • a dentin penetration inhibition ratio achieved when one side of a 700 ⁇ m thick bovine tooth disc is treated with the dentin mineralizing agent satisfies the following formula (I):
  • a tooth surface-treating material comprising the dentin mineralizing agent is a preferred embodiment of the present invention, and a dentifrice comprising the dentin mineralizing agent is a preferred embodiment of the present invention.
  • a chewing gum comprising the dentin mineralizing agent is a preferred embodiment of the present invention, a dentinal hypersensitivity inhibitor composed of the dentin mineralizing agents is a preferred embodiment of the present invention.
  • Another preferred embodiment of the present invention is a dentinal hypersensitivity inhibitor composed of the dentin mineralizing agent, wherein the dentinal hypersensitivity inhibitor further comprises acidic calcium phosphate particles (C), the tetracalcium phosphate particles (A) has an average particle diameter of 0.5 to 40 ⁇ m, the blended amount of the tetracalcium phosphate particles (A) relative to 100 parts by weight of the whole amount of the dentinal hypersensitivity inhibitor is 5 to 55 parts by weight, and the dentinal hypersensitivity inhibitor is a material to be used for closing dentinal tubules by rubbing a dentin surface therewith.
  • the dentinal hypersensitivity inhibitor is a material to be used for closing dentinal tubules by rubbing a dentin surface therewith.
  • Another preferred embodiment of the present invention is a dentinal hypersensitivity inhibitor composed of the dentin mineralizing agent, wherein when a suspension is prepared by adding 0.05 g of the dentinal hypersensitivity inhibitor into 200 g of pure water of 25° C., a free alkali metal ion concentration of the suspension at a time of 10 minutes after the adding is 0.2 to 100 mg/L. At this time, it is preferred that the agent further comprise acidic calcium phosphate particles (C).
  • a method for producing a dentin mineralizing agent comprising mixing tetracalcium phosphate particles (A), an alkali metal salt of phosphoric acid (B), and a liquid or aqueous paste comprising water as a main ingredient, wherein 1 to 100 parts by weight of the alkali metal salt of phosphoric acid (B) is blended to 100 parts by weight of the tetracalcium phosphate particles (A), and the blended amount of the tetracalcium phosphate particles (A) relative to 100 parts by weight of the whole amount of the dentin mineralizing agent is adjusted to 1 to 80 parts by weight.
  • a powder comprising the tetracalcium phosphate particles (A) and the alkali metal salt of phosphoric acid (B) or a powder comprising the tetracalcium phosphate particles (A), the alkali metal salt of phosphoric acid (B), and acidic calcium phosphate particles (C) is mixed beforehand, and it is preferred that at least one device selected from among a jet mill, a pestle and mortar machine, a ball mill, a high-speed rotation mill, a planetary mill, a hybridizer, a mechanofusion machine, or a mixing extruder is used in the mixing.
  • a liquid or aqueous paste comprising water as a main ingredient and also comprising the alkali metal salt of phosphoric acid (B) to a powder or nonaqueous paste comprising the tetracalcium phosphate particles (A) and then mix them.
  • a method for producing a dentinal hypersensitivity inhibitor comprising mixing tetracalcium phosphate particles (A), an alkali metal salt of phosphoric acid (B), acidic calcium phosphate particles (C), and a liquid or aqueous paste comprising water as a main ingredient, wherein the dentinal hypersensitivity inhibitor is a material to be used for closing dentinal tubules by rubbing a dentin surface therewith, the tetracalcium phosphate particles (A) has an average particle diameter of 0.5 to 40 ⁇ m to 100 parts by weight of the alkali metal salts of phosphoric acid (B) is blended to 100 parts by weight of the tetracalcium phosphate particles (A), and the blended amount of the tetracalcium phosphate particles (A) relative to 100 parts by weight of the whole amount of the dentinal hypersensitivity inhibitor is adjusted to 5 to 55 parts by weight.
  • the dentinal hypersensitivity inhibitor is a material to be used for closing dentinal tubules by rubbing
  • a liquid or aqueous paste comprising water as a main ingredient and also comprising the acidic calcium phosphate particles (C) to a powder or nonaqueous paste comprising the tetracalcium phosphate particles (A) and the alkali metal salt of phosphoric acid (B) and then mix them.
  • a method for producing a dentinal hypersensitivity inhibitor comprising mixing tetracalcium phosphate particles (A), an alkali metal salt of phosphoric acid (B), and a liquid or aqueous paste comprising water as a main ingredient, wherein 1 to 100 parts by weight of the alkali metal salts of phosphoric acid (B) is blended to 100 parts by weight of the tetracalcium phosphate particles (A), and the blended amount of the tetracalcium phosphate particles (A) relative to 100 parts by weight of the whole amount of the dentinal hypersensitivity inhibitor is adjusted to 1 to 80 parts by weight, and when a suspension is prepared by adding 0.05 g of the dentinal hypersensitivity inhibitor into 200 g of pure water of 25° C., a free alkali metal ion concentration of the suspension at a time of 10 minutes after the adding is adjusted to 0.2 to 100 mg/L.
  • a dentinal hypersensitivity inhibitor comprising tetracalcium phosphate particles (A), an alkali metal salt of phosphoric acid (B), and acidic calcium phosphate particles (C), wherein a dentin surface is rubbed with the dentinal hypersensitivity inhibitor having the tetracalcium phosphate particles (A) having an average particle diameter of 0.5 to 40 ⁇ m, a blended amount of the tetracalcium phosphate particles (A) of 5 to 55 parts by weight relative to 100 parts by weight of the whole amount of the dentinal hypersensitivity inhibitor, and a blended amount of the alkali metal salt of phosphoric acid (B) of 1 to 100 parts by weight relative to 100 parts by weight of the tetracalcium phosphate particles (A).
  • a dentin mineralizing agent kit composed of a powder or nonaqueous paste comprising tetracalcium phosphate particles (A) and an alkali metal salt of phosphoric acid (B) and a liquid or aqueous paste comprising water as a main ingredient.
  • a dentin mineralizing agent kit composed of a powder or nonaqueous paste comprising tetracalcium phosphate particles (A), an alkali metal salt of phosphoric acid (B), and acidic calcium phosphate particles (C) and a liquid or aqueous paste comprising water as a main ingredient.
  • a dentin mineralizing agent kit composed of a powder or nonaqueous paste comprising tetracalcium phosphate particles (A) and a liquid or aqueous paste comprising water as a main ingredient and also comprising an alkali metal salt of phosphoric acid (B).
  • a dentin mineralizing agent kit composed of a powder or nonaqueous paste comprising tetracalcium phosphate particles (A), a powder or nonaqueous paste comprising an alkali metal salt of phosphoric acid (B), and a liquid or aqueous paste comprising water as a main ingredient.
  • a dentinal hypersensitivity inhibitor kit composed of a powder or nonaqueous paste comprising tetracalcium phosphate particles (A) and an alkali metal salt of phosphoric acid (B) and a liquid or aqueous paste comprising water as a main ingredient and also comprising acidic calcium phosphate particles (C).
  • a dentinal hypersensitivity inhibitor kit composed of a powder or nonaqueous paste comprising tetracalcium phosphate particles (A), a powder or nonaqueous paste comprising an alkali metal salt of phosphoric acid (B), a powder or nonaqueous paste comprising acidic calcium phosphate particles (C), and a liquid or aqueous paste comprising water as a main ingredient.
  • a dentin mineralizing agent by which a dense HAp is formed on a dentin surface and HAp is deposited to a deep portion of a dentinal tubule, so that it can close the dentinal tubule. Thanks to this, a false enamel is formed on a dentin surface to impart caries resistance and treatment of hyperesthesia becomes possible.
  • FIG. 1 A SEM photograph of a surface of a bovine dentin in which a HAp layer was formed in Example 1.
  • FIG. 2 A SEM photograph in which a surface of a bovine dentin in which dentinal tubules have been closed with HAp is compared with a surface of a bovine dentin in which dentinal tubules are exposed in Example 1.
  • FIG. 3 A SEM photograph in which a surface of a bovine dentin in which dentinal tubules have been closed with HAp is compared with a surface of a bovine dentin in which dentinal tubules are exposed in Example 25.
  • FIG. 4 A SEM photograph of a cross section of a bovine dentin in which dentinal tubules were closed with HAp in Example 25.
  • the dentin mineralizing agent of the present invention comprises tetracalcium phosphate particles (A) and an alkali metal salt of phosphoric acid (B). If a composition containing tetracalcium phosphate particles (A) is mixed in the presence of water, it will convert into hydroxyapatite slowly. It has been made clear by the present inventors that through the use of a dentin mineralizing agent comprising tetracalcium phosphate particles (A) and an alkali metal salt of phosphoric acid (B) in certain amounts, a mineralization effect is highly achieved and hydroxyapatite deposits to especially deep portions of dentinal tubules, so that the dentinal tubules can be closed. While the reason for this is not necessarily clear, the following mechanism is presumed.
  • a false enamel is formed on a dentin surface to impart caries resistance (prevention of root caries) and treatment of hyperesthesia becomes possible.
  • HAp deposits even to deep portions of dentinal tubules and thereby the dentinal tubules are closed, an apparent dentin mineral concentration increases and wear resistance is also improved.
  • the present inventors have considered that the balance of velocities at which calcium ions and phosphate ions are supplied is important for generating the above-mentioned effect. And they have confirmed that deposition of HAp does not proceed well when the solubility of a compound that supplies calcium ions or a compound that supplies phosphate ions is low or extremely high.
  • the tetracalcium phosphate particles (A) in an amount of 1 to 80 parts by weight relative to 100 parts by weight of the whole amount of the dentin mineralizing agent are contained.
  • the content of the tetracalcium phosphate particles (A) is less than 1 part by weight, a mineralization effect may not be obtained due to inhibition of deposition of HAp; the content is preferably 5 parts by weight or more, more preferably 10 parts by weight or more, and even more preferably 20 parts by weight or more.
  • the content of the tetracalcium phosphate particles (A) exceeds 80 parts by weight, a mineralization effect may not be obtained due to inhibition of deposition of HAp; the content is preferably 75 parts by weight or less, more preferably 70 parts by weight or less, and even more preferably 60 parts by weight or less.
  • the blended amount of the tetracalcium phosphate particles (A) relative to 100 parts by weight of the whole amount of the dentinal hypersensitivity inhibitor is preferably 5 to 55 parts by weight.
  • the blended amount of the tetracalcium phosphate particles (A) is less than 5 parts by weight, a capability of closing dentinal tubules may deteriorate due to inhibition of deposition of HAp; the blended amount is preferably 10 parts by weight or more, and more preferably 20 parts by weight or more.
  • the blended amount of the tetracalcium phosphate particles (A) exceeds 55 parts by weight, a capability of closing dentinal tubules may deteriorate due to inhibition of deposition of HAp; the blended amount is preferably 50 parts by weight or less, and more preferably 45 parts by weight or less.
  • a method for producing the tetracalcium phosphate [Ca 4 (PO 4 ) 2 O] particles (A) to be used in the present invention is not particularly restricted.
  • Commercially available tetracalcium phosphate particles may be used as it is, or alternatively, they may be used after appropriate regulation of their particle size by grinding.
  • a grinding method a method which is the same as the grinding method of acidic calcium phosphate particles (C) described below can be used.
  • an average particle diameter of the tetracalcium phosphate particles (A) to be used in the present invention is from 0.5 to 40 ⁇ m.
  • the average particle diameter is less than 5 ⁇ m, the tetracalcium phosphate particles (A) may dissolve excessively, so that the pH of the aqueous solution may become so high that hydroxyapatite does not deposit smoothly and, as a result, a mineralization effect may not be obtained.
  • the average particle diameter of the tetracalcium phosphate particles (A) is more preferably 5 ⁇ m or more, and even more preferably 10 ⁇ m or more.
  • the average particle diameter of the tetracalcium phosphate particles (A) is 35 ⁇ m or less, and more preferably 30 ⁇ m or less.
  • the average particle diameter of the tetracalcium phosphate particles (A) to be used in the present invention is calculated through measurement using a laser diffraction type particle size distribution analyzer.
  • the dentin mineralizing agent of the present invention contains the alkali metal salt of phosphoric acid (B) in an amount of 1 to 100 parts by weight relative to 100 parts by weight of the tetracalcium phosphate particles (A).
  • the alkali metal salt of phosphoric acid (B) in addition to the tetracalcium phosphate particles (A), it is possible to provide a dentin mineralizing agent that is high in mineralization effect and allows hydroxyapatite to deposit especially to deep portions of dentinal tubules.
  • the content of the alkali metal salt of phosphoric acid (B) is less than 1 part by weight, a mineralization effect may not be obtained due to inhibition of deposition of HAp; the content is preferably 2 parts by weight or more, and more preferably 5 parts by weight or more.
  • the content of the alkali metal salt of phosphoric acid (B) exceeds 100 parts by weight, a mineralization effect may not be obtained due to inhibition of deposition of HAp; the content is preferably 98 parts by weight or less, more preferably 95 parts by weight or less, and even more preferably 90 parts by weight or less.
  • the alkali metal salt of phosphoric acid (B) to be used in the present invention is not particularly restricted, and examples thereof include disodium hydrogen phosphate, dipotassium hydrogen phosphate, lithium dihydrogen phosphate, sodium dihydrogen phosphate, potassium dihydrogen phosphate, trisodium phosphate, tripotassium phosphate, and so on, among which one salt or two or more salts are used.
  • the alkali metal salt of phosphoric acid (B) is disodium hydrogen phosphate and/or sodium dihydrogen phosphate.
  • the alkali metal ion in the alkali metal salt of phosphoric acid (B) to be used in the present invention is a sodium ion.
  • an average particle diameter of the alkali metal salt of phosphoric acid (B) to be used in the present invention is from 0.5 to 20 ⁇ m. Since when the average particle diameter of the alkali metal salt of phosphoric acid (B) is less than 0.5 ⁇ m, it becomes difficult to disperse the salt uniformly in a liquid agent or a powder agent due to the fact that flocculation may become remarkable, when the dentin mineralizing agent of the present invention has converted into hydroxyapatite, a hole may be formed in the hydroxyapatite, so that a dentin penetration inhibition ratio may decrease; therefore the average particle diameter of the alkali metal salt of phosphoric acid (B) is preferably 1 ⁇ m or more.
  • the average particle diameter of the alkali metal salt of phosphoric acid (B) is 15 ⁇ m or less, and it is more preferred to be 10 ⁇ m or less.
  • the dentin mineralizing agent of the present invention further contains acidic calcium phosphate particles (C) in addition to the tetracalcium phosphate particles (A) and the alkali metal salt of phosphoric acid (B).
  • This enables it to enhance the mineralization effect.
  • the present inventors presume the reason for this to be that due to the inclusion of the acidic calcium phosphate particles (C) with low solubility in addition to the tetracalcium phosphate particles (A) and the alkali metal salt of phosphoric acid (B), calcium ions and phosphate ions can be supplied for a longer time after the application of the paste and the supply balance becomes more appropriate.
  • the acidic calcium phosphate particles (C) to be used in the present invention is not particularly restricted, and it is preferred that the acidic calcium phosphate particles (C) are at least one member selected from the group consisting of dicalcium phosphate anhydrous [CaHPO 4 ] particles, monocalcium phosphate anhydrous [Ca(H 2 PO 4 ) 2 ] particles, tricalcium phosphate [Ca 3 (PO 4 ) 2 ] particles, amorphous calcium phosphate [Ca 3 (PO 4 ) 2 .xH 2 O] particles, calcium dihydrogen pyrophosphate [CaH 2 P 2 O 7 ] particles, dicalcium phosphate dihydrate [CaHPO 4 .2H 2 O] particles, and monocalcium phosphate monohydrate [Ca(H 2 PO 4 ) 2 .H 2 O] particles.
  • dicalcium phosphate anhydrous [CaHPO 4 ] particles monocalcium phosphate anhydrous [Ca(H 2 PO 4 ) 2
  • At least one member selected from the group consisting of dicalcium phosphate anhydrous [CaHPO 4 ] particles, monocalcium phosphate anhydrous [Ca(H 2 PO 4 ) 2 ] particles, dicalcium phosphate dihydrate [CaHPO 4 .2H 2 O] particles, and monocalcium phosphate monohydrate [Ca(H 2 PO 4 ) 2 .H 2 O] particles is used more preferably, and particularly, at least one member selected from the group consisting of dicalcium phosphate anhydrous [CaHPO 4 ] particles and monocalcium phosphate anhydrous [Ca(H 2 PO 4 ) 2 ].particles is used even more preferably.
  • an average particle diameter of the acidic calcium phosphate particles (C) to be used in the present invention is from 0.1 to 7 ⁇ m.
  • the average particle diameter is less than 0.1 ⁇ m, dissolution into a liquid agent proceeds excessively and, as a result, the supply balance between calcium ions and phosphate ions may upset and the viscosity of a paste to be obtained by mixing with a liquid agent may become excessively high; more preferably, the average particle diameter is 0.3 ⁇ m or more.
  • the average particle diameter exceeds 7 ⁇ m, the acidic calcium phosphate particles (C) become less soluble in a liquid agent and, therefore, dissolution of the tetracalcium phosphate particles (A) may proceed excessively.
  • the average particle diameter of the acidic calcium phosphate particles (C) is more preferably 3 ⁇ m or less.
  • the average particle diameter of the acidic calcium phosphate particles (C) is calculated in the same manner as that for the average particle diameter of the tetracalcium phosphate particles (A).
  • a method for producing the acidic calcium phosphate particles (C) having such an average particle diameter is not particularly restricted. While commercial products may be used if available, it is often preferable to further grind a commercially available product. In such a case, a grinding machine, such as a ball mill, a pestle and mortar machine and a jet mill, can be used. Acidic calcium phosphate particles (C) can also be obtained by grinding a raw material powder of acidic calcium phosphate together with such a liquid medium as alcohol by the use of a pestle and mortar machine, a ball mill, or the like to prepare a slurry, and drying the obtained slurry. As the grinding machine in this process, a ball mill is preferably used. As the material of its pot and balls, alumina or zirconia is preferably used.
  • the average particle diameter of the tetracalcium phosphate particles (A) By adjusting the average particle diameter of the tetracalcium phosphate particles (A) to be larger than the average particle diameter of the acidic calcium phosphate particles (C), the balance between the solubilities of both of the materials becomes appropriate and it becomes possible to maintain the pH of an aqueous solution to be almost neutral. As a result, deposition of hydroxyapatite is smoothened, so that the mineralization effect can be enhanced.
  • it is more preferable to adjust the average particle diameter of (A) to be not more than 35 times, even more preferably not more than 30 times, and particularly preferably not more than 25 times the average particle diameter of (C).
  • the blending ratio (A/C) of the tetracalcium phosphate particles (A) to the acidic calcium phosphate particles (C) is not particularly restricted, it is preferable for the particles to be used in a blending ratio within the range of from 40/60 to 60/40 in molar ratio. Thanks to this, the dentin mineralizing agent with high mineralization effect of the present invention can be obtained.
  • the blending ratio (A/C) is more preferably from 45/55 to 55/45, and most preferably is substantially 50/50.
  • the dentin mineralizing agent of the present invention further contains a fluorine compound (D).
  • a fluorine compound (D) to be used in the present invention, is not particularly restricted, and examples thereof include sodium fluoride, potassium fluoride, ammonium fluoride, lithium fluoride, cesium fluoride, magnesium fluoride, calcium fluoride, strontium fluoride, strontium fluoride, barium fluoride, copper fluoride, zirconium fluoride, aluminum fluoride, stannous fluoride, sodium monofluorophosphate, potassium monofluorophosphorate, hydrofluoric acid, titanium sodium fluoride, titanium potassium fluoride, hexylamine hydrofluoride, laurylamine hydrofluoride, glycine hydrofluoride, alanine hydrofluoride, fluorosilanes, and diamine silver fluoride.
  • the used amount of the fluorine compound (D) is not particularly limited, and it is preferred that 0.01 to 3 parts by weight of the fluorine compound (D) in terms of fluoride ion are contained relative to 100 parts by weight of the whole amount of the dentin mineralizing agent.
  • the used amount of the fluorine compound (D) in terms of fluoride ion is less than 0.01 parts by weight, there is a possibility that the effect of promoting mineralization may deteriorate, and it is more preferred that the used amount is 0.05 parts by weight or more.
  • the used amount of the converted fluoride ions of the fluorine compound (D) exceeds 3 parts by weight, there is a possibility that safety may be impaired, and it is more preferred that the used amount is 1 part by weight or less.
  • the dentin mineralizing agent of the present invention may contain components other than the tetracalcium phosphate particle (A), the alkali metal salt of phosphoric acid (B), the acidic calcium phosphate (C), and the fluorine compound (D) as far as the effect of the present invention is not damaged.
  • a thickener may be blended according to need.
  • the thickener may be one or two or more species selected from among carboxymethylcellulose, sodium carboxymethylcellulose, hydroxypropylcellulose, hydroxypropylmethylcellulose, polyvinyl alcohol, polyethylene glycol, polyacrylic acid, polystyrene sulfonic acid, polystyrene sulfonic acid salts, polyglutamic acid, polyglutamic acid salts, polyaspartic acid, polyaspartic acid salts, polyL-lysin, polyL-lysin salts, starch other than cellulose, alginic acid, alginic acid salts, carrageenan, guar gum, xanthan gum, cellulose gum, hyaluronic acid, hyaluronic acid salts, pectin, pectin salts, polysaccharides such as chitin and chitosan, acidic polysaccharide esters such as propylene glycol alginate, and polymers such as proteins, e.g.
  • the thickener may be blended with a powder, and may be blended with a liquid agent, and also may be blended with a paste under mixing.
  • inorganic fillers typified by silica and metal oxides
  • polyhydric alcohols such as glycerol, ethylene glycol, propylene glycol, and diglycerol
  • sugar alcohols such as xylitol, sorbitol, and erythritol
  • polyethers such as polyethylene glycol and polypropylene glycol
  • artificial sweeteners such as aspartame, acesulfame potassium, liquorice extract, saccharin, and saccharin sodium, and so on may also be added.
  • the dentin mineralizing agent of the present invention preferably contains an inorganic filler, more preferably contains particles (E) of 0.002 to 2 ⁇ m in average particle diameter selected from silica or metal oxides, and even more preferably contains silica particles (E) having an average particle diameter of 0.002 to 2 ⁇ m.
  • antibacterial agents typified by cetyl pyridinium chloride etc.
  • disinfectants such as pirin and pirin
  • blood circulation improvers such as Actosin and PEG1
  • growth factors such as bFGF, PDGF, and BMP
  • bFGF bFGF
  • PDGF vascular endothelial growth factor
  • BMP blood circulation improvers
  • growth factors such as bFGF, PDGF, and BMP
  • cells which promote hard tissue formation such as osteoblasts, odontoblasts, and anaplastic bone marrow derived stem cells
  • ES embryonic stem
  • iPS induced pluripotent stem
  • the dentin mineralizing agent of the present invention when a suspension is prepared by adding 0.05 g of the dentin mineralizing agent into 200 g of pure water of 25° C., a free alkali metal ion concentration of the suspension at a time of 10 minutes after the adding is 0.2 to 100 mg/L. Thanks to that the aforementioned free alkali metal ion concentration is within such a range, there is an advantage that a dentin mineralizing agent good in dentin penetration inhibition ratio can be obtained.
  • the dentin mineralizing agent of the present invention that a standard deviation ⁇ determined when an average of the free alkali metal ion concentration is expressed by d satisfies ⁇ 0.3d, in other words, that a value ( ⁇ /d) produced by dividing a standard deviation ⁇ by an average d of the free alkali metal ion concentration is 0.3 or less.
  • a standard deviation ⁇ determined when an average of the free alkali metal ion concentration is expressed by d satisfies ⁇ 0.3d, in other words, that a value ( ⁇ /d) produced by dividing a standard deviation ⁇ by an average d of the free alkali metal ion concentration is 0.3 or less.
  • the alkali metal salt of phosphoric acid (B) is in agglomeration and the agglomerated alkali metal salt of phosphoric acid (B) is incorporated into dentinal tubule together with the dentin mineralizing agent prepared in the presence of water. It is considered that the agglomerated alkali metal salt of phosphoric acid (B) dissolves when the dentin mineralizing agent of the present invention has converted into HAp to form holes in the HAp, so that the dentin penetration inhibition ratio decreases.
  • the dentin mineralizing agent of the present invention that a dentin penetration inhibition ratio achieved when one side of a 700 ⁇ m thick bovine tooth disc is treated with the dentin mineralizing agent satisfies the following formula (1).
  • the dentin mineralizing agent of the present invention that satisfies the following formula (I) has an advantage that false enamel is formed on a dentin surface to impart thereto caries resistance and treatment of hyperesthesia becomes possible because HAp deposits to a deep portion of a dentinal tubule and thereby the dentinal tubule is closed.
  • a dentin mineralizing agent in paste form can be obtained by mixing a powder containing tetracalcium phosphate particles (A) and an alkali metal salt of phosphoric acid (B) with a liquid or aqueous paste containing water as a main ingredient. Since this dentin mineralizing agent in paste form containing water starts to develop a reaction of immediate conversion into HAp, it is preferred to be prepared just prior to use at a medical site. A mixing operation is not particularly restricted, and manual mixing and mixing with a static mixer are preferably adopted. The present inventors have confirmed that a mineralization effect is highly achieved if the content of the alkali metal salt of phosphoric acid (B) is within an appropriate range.
  • the above-mentioned mixing method in which the alkali metal salt of phosphoric acid (B) is added in a powder form is preferably adopted.
  • a dentin mineralizing agent obtained in such a manner is used preferably, for example, by applying it to a dentin surface.
  • the liquid containing water as a main ingredient may be either pure water or a liquid that contains water as a main ingredient and also contains other ingredients, and the aqueous paste containing water as a main ingredient represents a liquid in paste form that contains water as a main ingredient and also contains other ingredients.
  • the other ingredients are not particularly restricted, and examples thereof include the aforementioned acidic calcium phosphate particles (C), polyhydric alcohols, such as glycerol, ethylene glycol, propylene glycol, and diglycerol, sugar alcohols, such as xylitol, sorbitol, and erythritol, polyethers, such as polyethylene glycol and polypropylene glycol.
  • C acidic calcium phosphate particles
  • polyhydric alcohols such as glycerol, ethylene glycol, propylene glycol, and diglycerol
  • sugar alcohols such as xylitol, sorbitol, and erythritol
  • polyethers such as polyethylene glycol and polypropylene glycol.
  • acidic calcium phosphate particles (C) When acidic calcium phosphate particles (C) are contained as the other ingredient, a method of adding a liquid or aqueous paste comprising water as a main ingredient and also comprising acidic calcium phosphate particles (C) to a powder or nonaqueous paste comprising tetracalcium phosphate particles (A) and an alkali metal salt of phosphoric acid (B) and then mixing them. is also adopted preferably.
  • a dentin mineralizing agent in paste form can be obtained also by add a liquid or aqueous paste comprising water as a main ingredient and also comprising the alkali metal salt of phosphoric acid (B) to a powder or nonaqueous paste comprising the tetracalcium phosphate particles (A) and then mix them.
  • a reaction in which tetracalcium phosphate particles (A) dissolve to be converted to HAp occurs gradually in the presence of water, it is impossible to store a liquid or aqueous paste comprising water as a main ingredient with tetracalcium phosphate particles (A) having been mixed beforehand.
  • a method is preferably adopted in which a powder or a nonaqueous paste comprising a solvent other than water as a main ingredient comprising tetracalcium phosphate particle (A) is mixed with a liquid comprising water as a main ingredient and also comprising an alkali metal salt of phosphoric acid (B), and the method has an advantage that an operation to be done in preparing the agent by mixing just before use is convenient.
  • the solvent other than water to be used for the nonaqueous paste is not particularly restricted, and examples thereof include polyhydric alcohols, such as glycerol, ethylene glycol, propylene glycol, and diglycerol, and polyethers, such as polyethylene glycol and polypropylene glycol.
  • a powder comprising the tetracalcium phosphate particles (A) and the alkali metal salt of phosphoric acid (B) or a powder comprising the tetracalcium phosphate particles (A), the alkali metal salt of phosphoric acid (B), and acidic calcium phosphate particles (C) is mixed beforehand. Since this makes capability of closing dentinal tubules good, there is an advantage that the effect of inhibiting hyperesthesia is enhanced. Therefore, the dentin mineralizing agent of the present invention is used suitably as a dentinal hypersensitivity inhibitor as described later.
  • the dentin mineralizing agent of the present invention is used suitably for various applications such as a tooth surface-treating material, a dentifrice, or chewing gum. Since a reaction in which tetracalcium phosphate particles (A) dissolve to be converted to HAp occurs gradually in the presence of water, an embodiment in which water is supplied appropriately in use, such as a dentifrice and chewing gum, is permitted and an embodiment in which the agent is mixed appropriately with a liquid agent just prior to use, such as a tooth surface-treating material, is also permitted.
  • dentinal hypersensitivity inhibitor composed of the dentin mineralizing agent comprising tetracalcium phosphate particles (A) and an alkali metal salt of phosphoric acid (B), wherein the dentinal hypersensitivity inhibitor further comprises acidic calcium phosphate particles (C), the tetracalcium phosphate particles (A) has an average particle diameter of 0.5 to 40 ⁇ m, the blended amount of the tetracalcium phosphate particles (A) relative to 100 parts by weight of the whole amount of the dentinal hypersensitivity inhibitor is 5 to 55 parts by weight. While the reason for this is not necessarily clear, the following mechanism is presumed.
  • a dentinal hypersensitivity inhibitor characterized by being an agent to be used for closing dentinal tubules by rubbing a dentin surface therewith is a preferred embodiment of the present invention.
  • a method for inhibiting dentinal hypersensitivity by rubbing a dentin surface with such a dentinal hypersensitivity inhibitor is also a preferred embodiment of the present invention.
  • Another preferred embodiment of the present invention is a dentinal hypersensitivity inhibitor composed of the dentin mineralizing agent comprising tetracalcium phosphate particles (A) and an alkali metal salt of phosphoric acid (B), wherein when a suspension is prepared by adding 0.05 g of the dentinal hypersensitivity inhibitor into 200 g of pure water of 25° C., a free alkali metal ion concentration of the suspension at a time of 10 minutes after the adding is 0.2 to 100 mg/L.
  • the dentin mineralizing agent of the present invention may be in an embodiment that moisture is appropriately supplied in use as mentioned above and also may be in an embodiment that it is mixed appropriately with a liquid agent just before use. Therefore, a dentin mineralizing agent kit composed of a powder or nonaqueous paste comprising tetracalcium phosphate particles (A) and an alkali metal salt of phosphoric acid (B) and a liquid or aqueous paste comprising water as a main ingredient is one of the embodiments of the present invention.
  • a dentin mineralizing agent kit composed of a powder or nonaqueous paste comprising tetracalcium phosphate particles (A), an alkali metal salt of phosphoric acid (B), and acidic calcium phosphate particles (C) and a liquid or aqueous paste comprising water as a main ingredient is one of the embodiments of the present invention.
  • a dentin mineralizing agent kit composed of a powder or nonaqueous paste comprising tetracalcium phosphate particles (A) and a liquid or aqueous paste comprising water as a main ingredient and also comprising an alkali metal salt of phosphoric acid (B) is one of the embodiments of the present invention.
  • a dentin mineralizing agent kit composed of a powder or nonaqueous paste comprising tetracalcium phosphate particles (A), a powder or nonaqueous paste comprising an alkali metal salt of phosphoric acid (B), and a liquid or aqueous paste comprising water as a main ingredient is also one of the embodiments of the present invention.
  • a dentinal hypersensitivity inhibitor kit composed of a powder or nonaqueous paste comprising tetracalcium phosphate particles (A) and an alkali metal salt of phosphoric acid (B) and a liquid or aqueous paste comprising water as a main ingredient and also comprising acidic calcium phosphate particles (C) is one of the embodiments of the present invention.
  • a dentinal hypersensitivity inhibitor kit composed of a powder or nonaqueous paste comprising tetracalcium phosphate particles (A), a powder or nonaqueous paste comprising an alkali metal salt of phosphoric acid (B), a powder or nonaqueous paste comprising acidic calcium phosphate particles (C), and a liquid or aqueous paste comprising water as a main ingredient is also one of the embodiments of the present invention.
  • a cheek-side center of a healthy bovine incisor tooth was trimmed with #80, #1000 sand papers by using a rotary grinder, so that dentin was exposed.
  • the ground surface of the bovine tooth disc was further polished with wrapping films (#1200, #3000, #8000, produced by Sumitomo 3M Ltd.) to be smoothened.
  • This dentin portion was masked with manicure with a window of a test portion as large as 7 mm in both the ordinate direction and the abscissa direction (hereinafter referred to as a “dentin window”) left unmasked and was air-dried for one hour.
  • this bovine tooth As to this bovine tooth, a solution prepared by diluting a 0.5-M EDTA solution (produced by Wako Pure Chemical Industries, Ltd.) five times was applied to the dentin window for 30 seconds to perform demineralization, followed by washing with water for 30 minutes or more. Moreover, it was cleaned by application of a 10% sodium hypochlorite solution (Neo-Cleaner “SEKINE” produced by Neo Dental Chemical Products Co., Ltd.) for two minutes and then was washed in distilled water for about 30 minutes and air-dried for one hour, so that a bovine tooth to be used for mineralization was prepared.
  • a 10% sodium hypochlorite solution Naeo-Cleaner “SEKINE” produced by Neo Dental Chemical Products Co., Ltd.
  • a cake-like equimolar mixture was obtained by adding commercially available dicalcium phosphate anhydrous particles (Product No. 1430, made by J. T. Baker Chemical Co., NJ) and calcium carbonate (Product No. 1288, made by J. T. Baker Chemical Co., NJ) in equimolar amount to water, followed by stirring for one hour, filtering and drying.
  • the cake-like equimolar mixture was heated in an electric furnace (FUS732PB, manufactured by ADVANTEC MFS, INC.) at 1500° C.
  • a tetracalcium phosphate lump was prepared by cooling the mixture to room temperature in a desiccator.
  • the resulting lump was further ground roughly in a mortar and then screened to remove fine powders and tetracalcium phosphate masses, thereby adjusting the particle size to a range of 0.5 to 3 mm, so that crude tetracalcium phosphate was obtained.
  • the disodium hydrogen phosphate (B) particles to be used in this Example were obtained in the following manner.
  • a slurry was obtained resulting from addition of 50 g of commercially available disodium hydrogen phosphate particles (produced by Wako Pure Chemical Industries, Ltd.), 240 g of 95% ethanol (“Ethanol (95)” produced by Wako Pure Chemical Industries, Ltd.) and 480 g of zirconia balls having a diameter of 10 mm into a 1000-ml grinding pot made of alumina (“HD-B-104 Pot Mill” manufactured by Nikkato Corporation) and subsequent wet vibration pulverization at a rotation speed of 1500 rpm for 5 hours. Then, the slurry was subjected to evaporation of ethanol with a rotary evaporator, followed by vacuum drying at 60° C. for 6 hours.
  • the dicalcium phosphate anhydrous particles (C1) to be used in this Example (1.1 ⁇ m in average particle diameter) were obtained in the following manner. A slurry was obtained resulting from addition of 50 g of commercially available dicalcium phosphate anhydrous particles (Product No. 1430, produced by J. T.
  • SM-1 high-speed rotation mill
  • glycerol produced by Wako Pure Chemical Industries, Ltd.
  • 500 g of propylene glycol produced by Wako Pure Chemical
  • a dentin mineralizing agent was prepared by weighing out the powder agent obtained in the above-described (4) in an amount of 0.41 g accurately and then adding thereto 0.59 g of the paste in liquid form obtained in the above-described (5).
  • the composition of the dentin mineralizing agent is summarized in Table 1.
  • the preparation of an epoxy resin was performed in accordance with the Lucas method, and there was used a method that comprises mixing an epoxy resin and a curing agent uniformly and then adding an accelerator.
  • a method that comprises mixing an epoxy resin and a curing agent uniformly and then adding an accelerator was used to a 100-ml disposable cup.
  • 41 ml of Luveak 812 epoxy resin, produced by Nacalai Tesque, Inc.
  • 31 ml of Luveak MNA curing agent, produced by Nacalai Tesque, Inc.
  • 10 ml of Luveak DDSA curing agent, produced by Nacalai Tesque, Inc.
  • the mineralized bovine tooth was removed from the artificial saliva and was washed with water, and then it was immersed into a 70% aqueous ethanol solution contained in a vial. Immediately after the immersion, the vial was moved into a desiccator and was placed under a reduced pressure condition for 10 minutes. Then, the vial was taken out from the desiccator and it was attached to a low-speed stirrer (TR-118, manufactured by AS-ONE), followed by stirring at a rotation speed of about 4 rpm for 1 hour.
  • TR-118 low-speed stirrer
  • the same operations were performed using a 80% aqueous ethanol solution, a 90% aqueous ethanol solution, a 99% aqueous ethanol solution, and 100% ethanol (twice), wherein the bovine tooth was immersed in the second 100% ethanol continuously for one night.
  • the same operations were carried out sequentially for a 1:1 mixed solvent of propylene oxide and ethanol and for 100% propylene oxide (twice), wherein the bovine tooth was immersed in the second propylene oxide continuously for one night.
  • the immersion time was determined to be two hours.
  • the bovine tooth sample was put into a plastic container in which an epoxy resin was contained, and a curing reaction was carried out at 45° C. for one day and at 60° C. for two days.
  • the sample was cut together with the polyethylene container along a direction perpendicular to a demineralized surface by using a precision low-speed cutter (ISOMET1000, manufactured by BUEHLER), so that a slice of about 1 mm in thickness having a cross section of a portion to be tested was obtained.
  • a cheek-side center of a healthy bovine incisor tooth was trimmed with #80, #1000 sand papers by using a rotary grinder, so that it was shaped into a disc form about 1.5 cm in diameter and 0.9 mm in thickness.
  • the ground surface of the bovine tooth disc was further polished with wrapping films (#1200, #3000, #8000, produced by Sumitomo 3M Ltd.) to have a thickness of 0.7 mm and be smoothened.
  • a solution prepared by diluting a 0.5-M EDTA solution produced by Wako Pure Chemical Industries, Ltd.
  • a dentin mineralizing agent was prepared in the same manner as in Example 1 except for failing to use the dicalcium phosphate anhydrous particles (C1) and preparing the rest by using purified water in Example 1, and then measurement of an alkali metal ion concentration, morphological evaluation, and dentin penetration inhibition ratio evaluation were performed.
  • the composition of the dentin mineralizing agent used is summarized in Table 1, and the evaluation results obtained are summarized in Table 4.
  • a dentin mineralizing agent was prepared in the same manner as in Example 1 except for preparing it by adding the disodium hydrogen phosphate (B) particles to the paste in liquid form instead of by adding to the powder agent in Example 1, and then measurement of an alkali metal ion concentration, morphological evaluation, and dentin penetration inhibition ratio evaluation were performed.
  • the composition of the dentin mineralizing agent used is summarized in Table 1, and the evaluation results obtained are summarized in Table 4.
  • a dentin mineralizing agent was prepared in the same manner as in Example 1 except for adjusting the used amount of the disodium hydrogen phosphate (B) particles to 0.5 parts by weight and preparing the rest by using purified water in Example 1, and then measurement of an alkali metal ion concentration, morphological evaluation, and dentin penetration inhibition ratio evaluation were performed.
  • the composition of the dentin mineralizing agent used is summarized in Table 1, and the evaluation results obtained are summarized in Table 4.
  • a dentin mineralizing agent was prepared in the same manner as in Example 1 except for preparing it by adding 0.5 parts by weight of the disodium hydrogen phosphate (B) particles to the paste in liquid form instead of by adding 5 parts by weight of the disodium hydrogen phosphate (B) particles to the powder agent and preparing the rest by using purified water in Example 1, and then measurement of an alkali metal ion concentration, morphological evaluation, and dentin penetration inhibition ratio evaluation were performed.
  • the composition of the dentin mineralizing agent used is summarized in Table 1, the evaluation results obtained are summarized in Table 4.
  • a dentin mineralizing agent was prepared in the same manner as in Example 1 except for adjusting the used amount of the disodium hydrogen phosphate (B) particles to 25 parts by weight and preparing the rest by using purified water in Example 1, and then measurement of an alkali metal ion concentration, morphological evaluation, and dentin penetration inhibition ratio evaluation were performed.
  • the composition of the dentin mineralizing agent used is summarized in Table 1, and the evaluation results obtained are summarized in Table 4.
  • a dentin mineralizing agent was prepared in the same manner as in Example 1 except for preparing it by adding 25 parts by weight of the disodium hydrogen phosphate (B) particles to the paste in liquid form instead of by adding 5 parts by weight of the disodium hydrogen phosphate (B) particles to the powder agent and preparing the rest by using purified water in Example 1, and then measurement of an alkali metal ion concentration, morphological evaluation, and dentin penetration inhibition ratio evaluation were performed.
  • the composition of the dentin mineralizing agent used is summarized in Table 1, and the evaluation results obtained are summarized in Table 4.
  • a dentin mineralizing agent was prepared in the same manner as in Example 1 except for adjusting the used amount of the disodium hydrogen phosphate (B) particles to 2.5 parts by weight and preparing the rest by using purified water in Example 1, and then measurement of an alkali metal ion concentration, morphological evaluation, and dentin penetration inhibition ratio evaluation were performed.
  • the composition of the dentin mineralizing agent used is summarized in Table 1, and the evaluation results obtained are summarized in Table 4.
  • a dentin mineralizing agent was prepared in the same manner as in Example 1 except for adjusting the used amount of the disodium hydrogen phosphate (B) particles to 12 parts by weight and preparing the rest by using purified water in Example 1, and then measurement of an alkali metal ion concentration, morphological evaluation, and dentin penetration inhibition ratio evaluation were performed.
  • the composition of the dentin mineralizing agent used is summarized in Table 1, and the evaluation results obtained are summarized in Table 4.
  • a dentin mineralizing agent was prepared in the same manner as in Example 1 except for adjusting the used amount of the disodium hydrogen phosphate (B) particles to 18 parts by weight and preparing the rest by using purified water in Example 1, and then measurement of an alkali metal ion concentration, morphological evaluation, and dentin penetration inhibition ratio evaluation were performed.
  • the composition of the dentin mineralizing agent used is summarized in Table 1, and the evaluation results obtained are summarized in Table 4.
  • a dentin mineralizing agent was prepared in the same manner as in Example 1 except for adjusting the used amount of the tetracalcium phosphate particles (A1) to 73.5 parts by weight and the used amount of the disodium hydrogen phosphate (B) particles to 14 parts by weight and failing to use the dicalcium phosphate anhydrous particles (C1), glycerol, propylene glycol, xylitol, polyethylene glycol, and the silica particles (E) in and preparing the rest by using purified water Example 1, and then measurement of an alkali metal ion concentration, morphological evaluation, and dentin penetration inhibition ratio evaluation were performed.
  • the composition of the dentin mineralizing agent used is summarized in Table 1, and the evaluation results obtained are summarized in Table 4.
  • a dentin mineralizing agent was prepared in the same manner as in Example 1 except for adjusting the used amount of the tetracalcium phosphate particles (A1) to 49 parts by weight and the used amount of the disodium hydrogen phosphate (B) particles to 9.3 parts by weight and failing to use the dicalcium phosphate anhydrous particles (C1), glycerol, propylene glycol, xylitol, polyethylene glycol, and the silica particles (E) and preparing the rest with purified water in Example 1, and then measurement of an alkali metal ion concentration, morphological evaluation, and dentin penetration inhibition ratio evaluation were performed.
  • the composition of the dentin mineralizing agent used is summarized in Table 1, and the evaluation results obtained are summarized in Table 4.
  • a dentin mineralizing agent was prepared in the same manner as in Example 1 except for adjusting the used amount of the tetracalcium phosphate particles (A1) to 2.62 parts by weight and the used amount of the dicalcium phosphate anhydrous particles (C1) to 0.98 parts by weight, preparing the agent by adding 0.5 parts by weight of disodium hydrogen phosphate (B) particles to the paste in liquid form instead of preparing it by adding 5 parts by weight of the disodium hydrogen phosphate (B) particles to the powder agent, and preparing the rest by using purified water in Example 1, and then measurement of an alkali metal ion concentration, morphological evaluation, and dentin penetration inhibition ratio evaluation were performed.
  • the composition of the dentin mineralizing agent used is summarized in Table 1, and the evaluation results obtained are summarized in Table 4.
  • a dentin mineralizing agent was prepared in the same manner as in Example 1 except for adjusting the used amount of the tetracalcium phosphate particles (A1) to 2.62 parts by weight, the used amount of the disodium hydrogen phosphate (B) particles to 0.5 parts by weight, and the used amount of the dicalcium phosphate anhydrous particles (C1) to 0.98 parts by weight and preparing the rest by using purified water in Example 1, and then measurement of an alkali metal ion concentration, morphological evaluation, and dentin penetration inhibition ratio evaluation were performed.
  • the composition of the dentin mineralizing agent used is summarized in Table 1, and the evaluation results obtained are summarized in Table 4.
  • a dentin mineralizing agent was prepared in the same manner as in Example 1 except for adjusting the used amount of the tetracalcium phosphate particles (A1) to 5.24 parts by weight, the used amount of the disodium hydrogen phosphate (B) particles to 1 part by weight, and the used amount of the dicalcium phosphate anhydrous particles (C1) to 1.96 parts by weight and preparing the rest by using purified water in Example 1, and then measurement of an alkali metal ion concentration, morphological evaluation, and dentin penetration inhibition ratio evaluation were performed.
  • the composition of the dentin mineralizing agent used is summarized in Table 2, and the evaluation results obtained are summarized in Table 4.
  • a dentin mineralizing agent was prepared in the same manner as in Example 1 except for using 5 parts by weight of sodium dihydrogen phosphate (B) particles instead of using 5 parts by weight the disodium hydrogen phosphate (B) particles in Example 1, and then measurement of an alkali metal ion concentration, morphological evaluation, and dentin penetration inhibition ratio evaluation were performed.
  • the composition of the dentin mineralizing agent used is summarized in Table 2, and the evaluation results obtained are summarized in Table 4.
  • a dentin mineralizing agent was prepared in the same manner as in Example 1 except for preparing it by adding 5 parts by weight of sodium dihydrogen phosphate (B) particles to the paste in liquid form instead of by adding 5 parts by weight of the disodium hydrogen phosphate (B) particles to the powder agent and preparing the rest by using purified water in Example 1, and then measurement of an alkali metal ion concentration, morphological evaluation, and dentin penetration inhibition ratio evaluation were performed.
  • the composition of the dentin mineralizing agent used is summarized in Table 2, and the evaluation results obtained are summarized in Table 4.
  • a dentin mineralizing agent was prepared in the same manner as in Example 1 except for failing to use the sodium fluoride (D) particles and preparing the rest by using purified water in Example 1, and then measurement of an alkali metal ion concentration, morphological evaluation, and dentin penetration inhibition ratio evaluation were performed.
  • the composition of the dentin mineralizing agent used is summarized in Table 2, and the evaluation results obtained are summarized in Table 4.
  • the composition of the dentin mineralizing agent used is summarized in Table 2, and the evaluation results obtained are summarized in Table 4.
  • the composition of the dentin mineralizing agent used is summarized in Table 2, and the evaluation results obtained are summarized in Table 4.
  • the composition of the dentin mineralizing agent used is summarized in Table 2, and the evaluation results obtained are summarized in Table 4.
  • a dentin mineralizing agent was prepared in the same manner as in Example 1 except for adjusting the used amount of the tetracalcium phosphate particles (A1) to 18.4 parts by weight and the used amount of the disodium hydrogen phosphate (B) particles to 3.5 parts by weight and preparing the rest by using purified water in Example 1, and then measurement of an alkali metal ion concentration, morphological evaluation, and dentin penetration inhibition ratio evaluation were performed.
  • the composition of the dentin mineralizing agent used is summarized in Table 2, and the evaluation results obtained are summarized in Table 4.
  • a dentin mineralizing agent was prepared by mixing a nonaqueous paste prepared using 26.2 parts by weight of tetracalcium phosphate particles (A1), 0.21 parts by weight of sodium fluoride (D) particles, 0.5 parts by weight of silica particles (E), 18.09 parts by weight of glycerol and 5 parts by weight of propylene glycol with an aqueous paste prepared using 5 parts by weight of disodium hydrogen phosphate (B) particles, 9.8 parts by weight of dicalcium phosphate anhydrous particles (C1), 5 parts by weight of xylitol, 3 parts by weight of polyethylene glycol, 0.05 parts by weight of cetyl pyridinium chloride monohydrate, 3.5 parts by weight of silica particles (E) and prepared the rest by using purified water instead of preparing the powder agent and the paste in liquid form in Example 1, and morphological evaluation and dentin penetration inhibition ratio evaluation were performed.
  • the composition of the dentin mineralizing agent used is summarized in Table 3, and the evaluation results
  • a dentin mineralizing agent was prepared in the same manner as in Example 1 except for adjusting the used amount of the disodium hydrogen phosphate (B) particles to 0.2 parts by weight and preparing the rest by using purified water in Example 1, and then measurement of an alkali metal ion concentration, morphological evaluation, and dentin penetration inhibition ratio evaluation were performed.
  • the composition of the dentin mineralizing agent used is summarized in Table 2, and the evaluation results obtained are summarized in Table 4.
  • a dentin mineralizing agent was prepared in the same manner as in Example 1 except for preparing it by adding 0.2 parts by weight of the disodium hydrogen phosphate (B) particles to the paste in liquid form and preparing the rest by using purified water instead of by adding 5 parts by weight of the disodium hydrogen phosphate (B) particles to the powder agent in Example 1, and then measurement of an alkali metal ion concentration, morphological evaluation, and dentin penetration inhibition ratio evaluation were performed.
  • the composition of the dentin mineralizing agent used is summarized in Table 2, and the evaluation results obtained are summarized in Table 4.
  • a dentin mineralizing agent was prepared in the same manner as in Example 1 except for adjusting the used amount of the disodium hydrogen phosphate (B) particles to 27 parts by weight and preparing the rest by using purified water in Example 1, and then measurement of an alkali metal ion concentration, morphological evaluation, and dentin penetration inhibition ratio evaluation were performed.
  • the composition of the dentin mineralizing agent used is summarized in Table 2, and the evaluation results obtained are summarized in Table 4.
  • a dentin mineralizing agent was prepared in the same manner as in Example 1 except for adjusting the used amount of the tetracalcium phosphate particles (A1) to 81.3 parts by weight and the used amount of the disodium hydrogen phosphate (B) particles to 15.5 parts by weight and failing to use the dicalcium phosphate anhydrous particles (C1), glycerol, propylene glycol, xylitol, polyethylene glycol, and the silica particles (E) and preparing the rest by using purified water in Example 1, and then measurement of an alkali metal ion concentration, morphological evaluation, and dentin penetration inhibition ratio evaluation were performed.
  • the composition of the dentin mineralizing agent used is summarized in Table 2, and the evaluation results obtained are summarized in Table 4.
  • a dentin mineralizing agent was prepared in the same manner as in Example 1 except for adjusting the used amount of the tetracalcium phosphate particles (A1) to 0.87 parts by weight, the used amount of the disodium hydrogen phosphate (B) particles to 0.17 parts by weight, and the used amount of the dicalcium phosphate anhydrous particles (C1) to 0.33 parts by weight and preparing the rest by using purified water in Example 1, and then measurement of an alkali metal ion concentration, morphological evaluation, and dentin penetration inhibition ratio evaluation were performed.
  • the composition of the dentin mineralizing agent used is summarized in Table 2, and the evaluation results obtained are summarized in Table 4.
  • Example Example 24 49 Nonaqueous Tetracalcium (parts by 26.2 36.5 paste phosphate weight) (A1) A4 particle (A) Sodium fluoride (parts by 0.21 0.21 (D) particle weight) Silica particle (parts by 0.5 2 (E) weight) Glycerol (parts by 18.09 6.29 weight) Propylene (parts by 5 5 glycol weight) Aqueous Disodium (parts by 5 5 paste hydrogen weight) phosphate (B) particle Sodium (parts by — — dihydrogen weight) phosphate (B) particle Dicalcium (parts by 9.8 13.5 phosphate weight) (C1) (C1) anhydrous particle (C) Xylitol (parts by 5 5 weight) Polyethylene (parts by 3 3 glycol weight) Cetyl pyridinium (parts by 0.05 0.05 chloride weight) Silica particle (parts by 3.5 2 (E) weight) Purified water (parts by 23.65 21.45 weight) Total (parts by 100
  • a cake-like equimolar mixture was obtained by adding commercially available dicalcium phosphate anhydrous particles (Product No. 1430, made by J. T. Baker Chemical Co., NJ) and calcium carbonate (Product No. 1288, made by J. T. Baker Chemical Co., NJ) in equimolar amount to water, followed by stirring for one hour, filtering and drying.
  • the cake-like equimolar mixture was heated in an electric furnace (FUS732PB, manufactured by ADVANTEC MFS, INC.) at 1500° C.
  • a tetracalcium phosphate lump was prepared by cooling the mixture to room temperature in a desiccator.
  • the resulting lump was further ground roughly in a mortar and then screened to remove fine powders and tetracalcium phosphate masses, thereby adjusting the particle size to a range of 0.5 to 1 mm, so that crude tetracalcium phosphate was obtained.
  • a slurry was obtained by adding 50 g of the crude tetracalcium phosphate, 200 g of zirconia ball 10 mm in diameter, and 100 g of 99.5% dehydrated ethanol (“Ethanol, Dehydrated (99.5)” produced by Wako Pure Chemical Industries, Ltd.) to a 1000-ml pulverization pot made of alumina (“HD-B-104 Pot Mill” manufactured by Nikkato Corporation) and then subjecting them to wet vibration pulverization at a rotation speed of 1500 rpm for 12 hours.
  • the slurry was subjected to removal of ethanol by using a rotary evaporator and then vacuum dried at 60° C. for 6 hours, so that tetracalcium phosphate particles (A4) were obtained.
  • tetracalcium phosphate particles (A2) having an average particle diameter of 35.6 ⁇ m were obtained by changing the pulverization time in the preparation of the tetracalcium phosphate particles (A4) to 1 hour.
  • tetracalcium phosphate particles (A3) having an average particle diameter of 20.3 ⁇ m were obtained by changing the pulverization time in the preparation of the tetracalcium phosphate particles (A4) to 4 hours.
  • tetracalcium phosphate particles (A5) having an average particle diameter of 1.5 ⁇ m were obtained by changing the pulverization time in the preparation of the tetracalcium phosphate particles (A4) to 24 hours.
  • the disodium hydrogen phosphate (B) particles to be used in this Example were obtained in the following manner.
  • a slurry was obtained resulting from addition of 50 g of commercially available disodium hydrogen phosphate particles (produced by Wako Pure Chemical Industries, Ltd.), 240 g of 95% ethanol (“Ethanol (95)” produced by Wako Pure Chemical Industries, Ltd.) and 480 g of zirconia balls having a diameter of 10 mm into a 1000-ml grinding pot made of alumina (“HD-B-104 Pot Mill” manufactured by Nikkato Corporation) and subsequent wet vibration pulverization at a rotation speed of 1500 rpm for 5 hours. Then, the slurry was subjected to evaporation of ethanol with a rotary evaporator, followed by vacuum drying at 60° C. for 6 hours.
  • the dicalcium phosphate anhydrous particles (C1) to be used in this Example (1.1 ⁇ m in average particle diameter) were obtained in the following manner. A slurry was obtained resulting from addition of 50 g of commercially available dicalcium phosphate anhydrous particles (Product No. 1430, produced by J. T.
  • SM-1 high-speed rotation mill
  • a paste in liquid form for a dentinal hypersensitivity inhibitor was obtained by stirring and mixing 0.5 g of cetyl pyridinium chloride monohydrate (produced by Wako Pure Chemical Industries, Ltd.), 20 g of silica particles (E) (“AEROSIL 130 ” produced by Degussa Co., 0.016 ⁇ m in average particle diameter) and 427.4 g of distilled water for 5 hours.
  • a dentinal hypersensitivity inhibitor was prepared by weighing out the powder agent obtained in the above-described (4) in an amount of 0.55 g accurately and then adding thereto 0.45 g of the paste in liquid form obtained in the above-described (5).
  • the composition of the dentinal hypersensitivity inhibitor is summarized in Table 5.
  • the average (d) of the sodium ion concentration of the powder agent in Example 25 was 7.7 mg/L, and the value ( ⁇ /d) produced by dividing the standard deviation ( ⁇ ) of the sodium ion concentration by (d) was 0.04.
  • the results obtained are summarized in Table 5.
  • a cheek-side dentin of a healthy bovine incisor tooth was trimmed with #80, #1000 sand papers by using a rotary grinder, so that a bovine tooth disc about 1.5 cm in diameter and 0.9 mm in thickness was produced.
  • the surface of the bovine tooth disc was further polished with wrapping films (#1200, #3000, #8000, produced by Sumitomo 3M Ltd.) to have a thickness of 0.7 mm and be smoothened.
  • the resulting bovine tooth disc was immersed in a solution prepared by diluting a 0.5 M EDTA solution (produced by Wako Pure Chemical Industries, Ltd.) five times, for 180 seconds and was washed in distilled water for about 30 seconds.
  • a microbrush (“REGULAR SIZE (2.0 mm), MRB400” produced by MICROBRUSH INTERNATIONAL).
  • the dentin surface to receive pressure of phosphate-buffered saline was standardized to a surface area of 78.5 mm 2 (5 mm in diameter) using an O ring and was pressurized at 10 psi (69 kPa), and then a penetrated amount was measured after a lapse of 24 hours.
  • a penetrated amount of a bovine tooth disc having not been subjected to the mineralization (dentinal tubule closure) treatment was measured by the same operation, and a penetration inhibition ratio was calculated using the following formula.
  • the penetration inhibition ratio of the bovine tooth disc mineralized (dentinal tubule-closed) by Example 25 was 92%.
  • a cheek-side center of a healthy bovine incisor tooth was trimmed with #80, #1000 sand papers by using a rotary grinder, so that a 2 mm thick dentin plate with a cheek-side dentin exposed was produced.
  • This cheek-side dentin surface was further polished with wrapping films (#1200, #3000, #8000, produced by Sumitomo 3M Ltd.) to be smoothened.
  • This cheek-side dentin portion was masked with manicure with a window of a test portion as large as 7 mm in both the ordinate direction and the abscissa direction left unmasked, and then was air-dried for one hour.
  • this bovine tooth As to this bovine tooth, a solution prepared by diluting a 0.5-M EDTA solution (produced by Wako Pure Chemical Industries, Ltd.) five times was applied to the dentin window for 30 seconds to perform demineralization, followed by washing with water for 30 minutes or more. Moreover, it was cleaned by applying a 10% sodium hypochlorite solution (Neo-Cleaner “SEKINE” produced by Neo Dental Chemical Products Co., Ltd.) to it for two minutes and then was washed in water for about 30 minutes or more, so that a bovine tooth to be used for mineralization (dentinal tubule closure) evaluation was prepared.
  • a 10% sodium hypochlorite solution Naeo-Cleaner “SEKINE” produced by Neo Dental Chemical Products Co., Ltd.
  • the bovine tooth sample was immersed in a 70% aqueous ethanol solution in a vial.
  • the vial was moved into a desiccator and was placed under a reduced pressure condition for 10 minutes.
  • the vial was taken out from the desiccator and it was attached to a low-speed stirrer (TR-118, manufactured by AS-ONE), followed by stirring at a rotation speed of about 4 rpm for 1 hour.
  • TR-118 low-speed stirrer
  • the same operations were performed using a 80% aqueous ethanol solution, a 90% aqueous ethanol solution, a 99% aqueous ethanol solution, and 100% ethanol (twice), wherein the bovine tooth was immersed in the second 100% ethanol continuously for one night.
  • the average of the dentinal tubule closure depth by the hypersensitivity inhibitor of Example 25 was 15 ⁇ m.
  • the results obtained are summarized in Table 7, and the SEM photographs obtained are summarized in FIG. 3 and FIG. 4 (the arrow drawn in FIG. 4 indicates dentinal tubules closed by HAp).
  • a dentinal hypersensitivity inhibitor was prepared in the same manner as in Example 25 except for preparing it by adding the disodium hydrogen phosphate (B) particles to the paste in liquid form instead of by adding to the powder agent in Example 25, and then measurement of an alkali metal ion concentration, morphological evaluation, and dentin penetration inhibition ratio evaluation were performed.
  • the composition of the dentinal hypersensitivity inhibitor used is summarized in Table 5, and the evaluation results obtained are summarized in Table 7.
  • a dentinal hypersensitivity inhibitor was prepared in the same manner as in Example 25 except for adjusting the used amount of the disodium hydrogen phosphate (B) particles to 0.15 parts by weight and preparing the rest by using purified water in Example 25, and then measurement of an alkali metal ion concentration, morphological evaluation, and dentin penetration inhibition ratio evaluation were performed.
  • the composition of the dentinal hypersensitivity inhibitor used is summarized in Table 5, and the evaluation results obtained are summarized in Table 7.
  • a dentinal hypersensitivity inhibitor was prepared in the same manner as in Example 25 except for adjusting the used amount of the disodium hydrogen phosphate (B) particles to 0.3 parts by weight and preparing the rest by using purified water in Example 25, and then measurement of an alkali metal ion concentration, morphological evaluation, and dentin penetration inhibition ratio evaluation were performed.
  • the composition of the dentinal hypersensitivity inhibitor used is summarized in Table 5, and the evaluation results obtained are summarized in Table 7.
  • a dentinal hypersensitivity inhibitor was prepared in the same manner as in Example 25 except for adjusting the used amount of the disodium hydrogen phosphate (B) particles to 2.5 parts by weight and preparing the rest by using purified water in Example 25, and then measurement of an alkali metal ion concentration, morphological evaluation, and dentin penetration inhibition ratio evaluation were performed.
  • the composition of the dentinal hypersensitivity inhibitor used is summarized in Table 5, and the evaluation results obtained are summarized in Table 7.
  • a dentinal hypersensitivity inhibitor was prepared in the same manner as in Example 25 except for adjusting the used amount of the disodium hydrogen phosphate (B) particles to 20 parts by weight and preparing the rest by using purified water in Example 25, and then measurement of an alkali metal ion concentration, morphological evaluation, and dentin penetration inhibition ratio evaluation were performed.
  • the composition of the dentinal hypersensitivity inhibitor used is summarized in Table 5, and the evaluation results obtained are summarized in Table 7.
  • a dentinal hypersensitivity inhibitor was prepared in the same manner as in Example 25 except for adjusting the used amount of the tetracalcium phosphate particles (A4) to 21.9 parts by weight, the used amount of the disodium hydrogen phosphate (B) particles to 21 parts by weight, and the used amount of the dicalcium phosphate anhydrous particles (C1) to 8.1 parts by weight and preparing the rest by using purified water in Example 25, and then measurement of an alkali metal ion concentration, morphological evaluation, and dentin penetration inhibition ratio evaluation were performed.
  • the composition of the dentinal hypersensitivity inhibitor used is summarized in Table 5, and the evaluation results obtained are summarized in Table 7.
  • a dentinal hypersensitivity inhibitor was prepared in the same manner as in Example 25 except for adjusting the used amount of the tetracalcium phosphate particles (A4) to 21.9 parts by weight, the used amount of the disodium hydrogen phosphate (B) particles to 27 parts by weight, and the used amount of the dicalcium phosphate anhydrous particles (C1) to 8.1 parts by weight and preparing the rest by using purified water in Example 25, and then measurement of an alkali metal ion concentration, morphological evaluation, and dentin penetration inhibition ratio evaluation were performed.
  • the composition of the dentinal hypersensitivity inhibitor used is summarized in Table 5, and the evaluation results obtained are summarized in Table 7.
  • a dentinal hypersensitivity inhibitor was prepared in the same manner as in Example 25 except for adjusting the used amount of the tetracalcium phosphate particles (A4) to 5.5 parts by weight, the used amount of the disodium hydrogen phosphate (B) particles to 0.75 parts by weight, and the used amount of the dicalcium phosphate anhydrous particles (C1) to 2 parts by weight and preparing the rest by using purified water in Example 25, and then measurement of an alkali metal ion concentration, morphological evaluation, and dentin penetration inhibition ratio evaluation were performed.
  • the composition of the dentinal hypersensitivity inhibitor used is summarized in Table 5, and the evaluation results obtained are summarized in Table 7.
  • a dentinal hypersensitivity inhibitor was prepared in the same manner as in Example 25 except for adjusting the used amount of the tetracalcium phosphate particles (A4) to 7.5 parts by weight, the used amount of the disodium hydrogen phosphate (B) particles to 1.03 parts by weight, and the used amount of the dicalcium phosphate anhydrous particles (C1) to 2.8 parts by weight and preparing the rest by using purified water in Example 25, and then measurement of an alkali metal ion concentration, morphological evaluation, and dentin penetration inhibition ratio evaluation were performed.
  • the composition of the dentinal hypersensitivity inhibitor used is summarized in Table 5, and the evaluation results obtained are summarized in Table 7.
  • a dentinal hypersensitivity inhibitor was prepared in the same manner as in Example 25 except for adjusting the used amount of the tetracalcium phosphate particles (A4) to 15 parts by weight, the used amount of the disodium hydrogen phosphate (B) particles to 2.06 parts by weight, and the used amount of the dicalcium phosphate anhydrous particles (C1) to 5.6 parts by weight and preparing the rest by using purified water in Example 25, and then measurement of an alkali metal ion concentration, morphological evaluation, and dentin penetration inhibition ratio evaluation were performed.
  • the composition of the dentinal hypersensitivity inhibitor used is summarized in Table 5, and the evaluation results obtained are summarized in Table 7.
  • a dentinal hypersensitivity inhibitor was prepared in the same manner as in Example 25 except for adjusting the used amount of the tetracalcium phosphate particles (A4) to 50 parts by weight, the used amount of the disodium hydrogen phosphate (B) particles to 6.86 parts by weight, and the used amount of the dicalcium phosphate anhydrous particles (C1) to 18.6 parts by weight and preparing the rest by using purified water in Example 25, and then measurement of an alkali metal ion concentration, morphological evaluation, and dentin penetration inhibition ratio evaluation were performed.
  • the composition of the dentinal hypersensitivity inhibitor used is summarized in Table 5, and the evaluation results obtained are summarized in Table 7.
  • a dentinal hypersensitivity inhibitor was prepared in the same manner as in Example 25 except for adjusting the used amount of the disodium hydrogen phosphate (B) particles to 5.58 parts by weight and the used amount of the dicalcium phosphate anhydrous particles (C1) to 19.3 parts by weight and preparing the rest by using purified water in Example 25, and then measurement of an alkali metal ion concentration, morphological evaluation, and dentin penetration inhibition ratio evaluation were performed.
  • the composition of the dentinal hypersensitivity inhibitor used is summarized in Table 5, and the evaluation results obtained are summarized in Table 7.
  • the composition of the dentinal hypersensitivity inhibitor used is summarized in Table 5, and the evaluation results obtained are summarized in Table 7.
  • the composition of the dentinal hypersensitivity inhibitor used is summarized in Table 5, and the evaluation results obtained are summarized in Table 7.
  • the composition of the dentinal hypersensitivity inhibitor used is summarized in Table 6, and the evaluation results obtained are summarized in Table 7.
  • a dentinal hypersensitivity inhibitor was prepared in the same manner as in Example 25 except for using 5 parts by weight of sodium dihydrogen phosphate (B) particles instead of using 5 parts by weight the disodium hydrogen phosphate (B) particles in Example 25, and then measurement of an alkali metal ion concentration, morphological evaluation, and dentin penetration inhibition ratio evaluation were performed.
  • the composition of the dentinal hypersensitivity inhibitor used is summarized in Table 6, and the evaluation results obtained are summarized in Table 7.
  • a dentinal hypersensitivity inhibitor was prepared in the same manner as in Example 25 except for preparing it by adding 5 parts by weight of sodium dihydrogen phosphate (B) particles to the paste in liquid form instead of by adding 5 parts by weight of the disodium hydrogen phosphate (B) particles to the powder agent in Example 25, and then measurement of an alkali metal ion concentration, morphological evaluation, and dentin penetration inhibition ratio evaluation were performed.
  • the composition of the dentinal hypersensitivity inhibitor used is summarized in Table 6, and the evaluation results obtained are summarized in Table 7.
  • a dentinal hypersensitivity inhibitor was prepared in the same manner as in Example 25 except for failing to use the sodium fluoride (D) particles and preparing the rest by using purified water in Example 25, and then measurement of an alkali metal ion concentration, morphological evaluation, and dentin penetration inhibition ratio evaluation were performed.
  • the composition of the dentinal hypersensitivity inhibitor used is summarized in Table 6, and the evaluation results obtained are summarized in Table 7.
  • a dentinal hypersensitivity inhibitor was prepared in the same manner as in Example 25 except for failing to use the silica particles (E) for the paste in liquid form and preparing the rest by using purified water in Example 25, and then measurement of an alkali metal ion concentration, morphological evaluation, and dentin penetration inhibition ratio evaluation were performed.
  • the composition of the dentinal hypersensitivity inhibitor used is summarized in Table 6, and the evaluation results obtained are summarized in Table 7.
  • a dentinal hypersensitivity inhibitor was prepared in the same manner as in Example 25 except for preparing it by adding 2 parts by weight of the silica particles (E) to the powder agent instead of by adding to the paste in liquid form in Example 25, and then measurement of an alkali metal ion concentration, morphological evaluation, and dentin penetration inhibition ratio evaluation were performed.
  • the composition of the dentinal hypersensitivity inhibitor used is summarized in Table 6, and the evaluation results obtained are summarized in Table 7.
  • a dentinal hypersensitivity inhibitor was prepared in the same manner as in Example 25 except for preparing it by adding 36.5 parts by weight of tetracalcium phosphate particles (A2) having an average particle diameter of 35.6 ⁇ m instead of by adding 36.5 parts by weight of the tetracalcium phosphate particles (A4) having an average particle diameter of 5.2 ⁇ m in Example 25, and then measurement of an alkali metal ion concentration, morphological evaluation, and dentin penetration inhibition ratio evaluation were performed.
  • the composition of the dentinal hypersensitivity inhibitor used is summarized in Table 6, and the evaluation results obtained are summarized in Table 7.
  • a dentinal hypersensitivity inhibitor was prepared in the same manner as in Example 25 except for preparing it by adding 36.5 parts by weight of tetracalcium phosphate particles (A5) having an average particle diameter of 1.5 ⁇ m instead of by adding 36.5 parts by weight of the tetracalcium phosphate particles (A4) having an average particle diameter of 5.2 ⁇ m in Example 25, and then measurement of an alkali metal ion concentration, morphological evaluation, and dentin penetration inhibition ratio evaluation were performed.
  • the composition of the dentinal hypersensitivity inhibitor used is summarized in Table 6, and the evaluation results obtained are summarized in Table 7.
  • a dentinal hypersensitivity inhibitor was prepared by mixing a nonaqueous paste prepared using 36.5 parts by weight of tetracalcium phosphate particles (A4), 0.21 parts by weight of sodium fluoride (D) particles, 2 parts by weight of silica particles (E), 6.29 parts by weight of glycerol and 5 parts by weight of propylene glycol with an aqueous paste prepared using 5 parts by weight of disodium hydrogen phosphate (B) particles, 13.5 parts by weight of dicalcium phosphate anhydrous particles (C1), 5 parts by weight of xylitol, 3 parts by weight of polyethylene glycol, 0.05 parts by weight of cetyl pyridinium chloride monohydrate, 2 parts by weight of silica particles (E) and prepared the rest by using purified water instead of preparing the powder agent and the paste in liquid form in Example 25, and measurement of an alkali metal ion concentration, morphological evaluation and dentin penetration inhibition ratio evaluation were performed.
  • the composition of the dentinal hypersensitivity inhibitor used
  • a dentinal hypersensitivity inhibitor was prepared in the same manner as in Example 25, and measurement of an alkali metal ion concentration, morphological evaluation, and dentin penetration inhibition ratio evaluation were performed.
  • the composition of the dentinal hypersensitivity inhibitor used is summarized in Table 6, and the evaluation results obtained are summarized in Table 7.
  • a powder agent for a dentinal hypersensitivity inhibitor was obtained by adding tetracalcium phosphate particles (A4), disodium hydrogen phosphate (B) particles, dicalcium phosphate anhydrous particles (C1), and sodium fluoride (D) particles in the same amounts as those in Example 25 into a pestle and mortar machine (automatic mortar, “ANM-200” manufactured by AS ONE Corporation) and mixing them with a mortar at a rotation speed of 6 rpm and a pestle at 100 rpm for five hours instead of using Method 1 by which a powder agent was prepared by using a high-speed rotary mill.
  • the method for preparing a powder agent in which it is obtained by performing mixing in such a way was named “Method 3”.
  • a dentinal hypersensitivity inhibitor was prepared in the same manner as in Example 25, and measurement of an alkali metal ion concentration, morphological evaluation, and dentin penetration inhibition ratio evaluation were performed.
  • the composition of the dentinal hypersensitivity inhibitor used is summarized in Table 6, and the evaluation results obtained are summarized in Table 7.
  • a powder agent for a dentinal hypersensitivity inhibitor was obtained by adding tetracalcium phosphate particles (A4), disodium hydrogen phosphate (B) particles, dicalcium phosphate anhydrous particles (C1), and sodium fluoride (D) particles in the same amounts as those in Example 25 into a 400-ml pulverization pot made of alumina (“Type A-3 HD Pot Mill” manufactured by Nikkato Corp.) without addition of zirconia balls and mixing them at a rotation speed of 1500 rpm for 30 minutes instead of using Method 1 by which a powder agent was prepared by using a high-speed rotary mill.
  • the method for preparing a powder agent in which it is obtained by performing mixing in such a way was named “Method 4”.
  • a dentinal hypersensitivity inhibitor was prepared in the same manner as in Example 25, and measurement of an alkali metal ion concentration, morphological evaluation, and dentin penetration inhibition ratio evaluation were performed.
  • the composition of the dentinal hypersensitivity inhibitor used is summarized in Table 6, and the evaluation results obtained are summarized in Table 7.
  • a dentinal hypersensitivity inhibitor was prepared in the same manner as in Example 25 except for preparing it by adding 13.5 parts by weight of dicalcium phosphate anhydrous particles (C2) having an average particle diameter of 10.2 ⁇ m instead of by adding 13.5 parts by weight of the dicalcium phosphate anhydrous particles (C1) having an average particle diameter of 1.1 ⁇ m in Example 25, and then measurement of an alkali metal ion concentration, morphological evaluation, and dentin penetration inhibition ratio evaluation were performed.
  • the composition of the dentinal hypersensitivity inhibitor used is summarized in Table 6, and the evaluation results obtained are summarized in Table 7.
  • a dentinal hypersensitivity inhibitor was prepared in the same manner as in Example 25 except for preparing it by adding 13.5 parts by weight of dicalcium phosphate anhydrous particles (C3) having an average particle diameter of 17.1 ⁇ m instead of by adding 13.5 parts by weight of the dicalcium phosphate anhydrous particles (C1) having an average particle diameter of 1.1 ⁇ m in Example 25, and then measurement of an alkali metal ion concentration, morphological evaluation, and dentin penetration inhibition ratio evaluation were performed.
  • the composition of the dentinal hypersensitivity inhibitor used is summarized in Table 6, and the evaluation results obtained are summarized in Table 7.
  • a dentinal hypersensitivity inhibitor was prepared in the same manner as in Example 25 except for failing to use the disodium hydrogen phosphate (B) particles in Example 25 and preparing the rest by using purified water, and then measurement of an alkali metal ion concentration, morphological evaluation, and dentin penetration inhibition ratio evaluation were performed.
  • the composition of the dentinal hypersensitivity inhibitor used is summarized in Table 6, and the evaluation results obtained are summarized in Table 7.
  • Example 25 Penetration Dentinal tubule inhibition ratio closing depth (%) ( ⁇ m) Example 25 92 15 Example 26 90 14 Example 27 37 10 Example 28 52 11 Example 29 86 12 Example 30 82 10 Example 31 64 12 Example 32 31 11 Example 33 27 4 Example 34 39 7 Example 35 68 10 Example 36 82 3 Example 37 84 12 Example 38 91 14 Example 39 85 11 Example 40 78 9 Example 41 91 14 Example 42 88 14 Example 43 86 12 Example 44 88 12 Example 45 90 13 Example 46 51 4 Example 47 78 6 Example 48 66 13 Example 49 81 14 Example 50 99 14 Example 51 100 15 Example 52 54 13 Example 53 52 6 Example 54 42 4 Comparative 22 10 Example 6

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EP2425843B1 (en) 2015-08-26
CN102448471A (zh) 2012-05-09
US20130251767A1 (en) 2013-09-26
JPWO2010113800A1 (ja) 2012-10-11
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WO2010113800A1 (ja) 2010-10-07
JP2015028069A (ja) 2015-02-12

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