WO2022137020A1 - Curing agent for alginate-based dental impression material, alginate-based dental impression material, and impression material kit - Google Patents

Curing agent for alginate-based dental impression material, alginate-based dental impression material, and impression material kit Download PDF

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Publication number
WO2022137020A1
WO2022137020A1 PCT/IB2021/061714 IB2021061714W WO2022137020A1 WO 2022137020 A1 WO2022137020 A1 WO 2022137020A1 IB 2021061714 W IB2021061714 W IB 2021061714W WO 2022137020 A1 WO2022137020 A1 WO 2022137020A1
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Prior art keywords
curing agent
oxide particles
impression material
alginate
equal
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PCT/IB2021/061714
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French (fr)
Inventor
Daiki MOTOMATSU
Koji Miyamoto
Hikaru Takeda
Shohei NABENO
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3M Innovative Properties Company
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Publication of WO2022137020A1 publication Critical patent/WO2022137020A1/en

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    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K6/00—Preparations for dentistry
    • A61K6/15—Compositions characterised by their physical properties

Definitions

  • the present invention relates to a curing agent for an alginate-based dental impression material, an alginate-based dental impression material, and an impression material kit.
  • Alginate-based impression materials are known to be widely used as dental impression materials, and magnesium oxide is often added to curing agents for curing the impression materials.
  • the magnesium oxide contained in curing agents is required to have high reactivity. Therefore, a magnesium oxide having a large specific surface area is commonly added to curing agents.
  • Patent Literature 1 discloses a method of producing a curing agent for an impression material that has little delay in curing time due to long-term storage by pre-heating a mixture of highly reactive magnesium oxide having a specific surface area of 100 to 200 m 2 /g and a surfactant to a temperature of 40 to 150°C.
  • Patent Literature 1 has problems such that it takes 1 hour to several days for heat treatment and the manufacturing efficiency is poor.
  • One aspect of the present invention relates to a curing agent for an alginate-based dental impression material including: calcium sulfate; metal oxide particles; an inorganic fluorine compound; and a liquid paraffin, in which the metal oxide particles include magnesium oxide particles, and the magnesium oxide particles have a specific surface area of 0.01 to 2 m 2 /g.
  • the metal oxide particles may further include zinc oxide particles.
  • the metal oxide particles may have a content of 4 to 10 mass%.
  • an alginate-based dental impression material including: a base material containing an alkali metal alginate and water; and the curing agent.
  • Still another aspect of the present invention relates to an impression material kit including: a first container including a base material containing an alkali metal alginate and water; and a second container including the curing agent.
  • an alginate-based dental impression material in which changes in curing time due to long-term storage can be sufficiently suppressed.
  • an alginate-based dental impression material and an impression material kit which includes the curing agent and in which changes in curing time due to long-term storage are sufficiently suppressed as well as an impression kit.
  • the curing agent for an alginate-based dental impression material includes calcium sulfate, metal oxide particles, an inorganic fluorine compound, and a liquid paraffin.
  • the magnesium oxide particles contained in the metal oxide particles have a specific surface area of 0.01 to 2 m 2 /g.
  • the magnesium oxide and the inorganic fluorine compound may react with small amounts of moisture present in the curing agent to form magnesium fluoride.
  • the inorganic fluorine compound is potassium hexafluorotitanate
  • magnesium oxide reacts with water to form magnesium hydroxide (Formula (1))
  • potassium hexafluorotitanate reacts with water to form hydrogen fluoride (Formula (2))
  • magnesium hydroxide reacts with hydrogen fluoride to form magnesium fluoride. It is believed that this magnesium fluoride contributes to curing of the impression material, thereby changing the curing time.
  • the calcium sulfate may be an anhydrate or a hydrate, and examples of anhydrates and hydrates include calcium sulfate anhydrides, calcium sulfate hemihydrates, and calcium sulfate dihydrates. From the viewpoint of making it easier to control the physical properties of the dental impression material after curing, calcium sulfate hemihydrates are preferable.
  • the content of calcium sulfate in the curing agent is, for example, greater than or equal to 35 mass%, preferably greater than or equal to 40 mass%, and more preferably greater than or equal to 45 mass%, from the viewpoint of obtaining an excellent function as a calcium sulfate gelling agent. Further, the content of calcium sulfate in the curing agent is, for example, less than or equal to 70 mass%, preferably less than or equal to 65 mass%, and more preferably less than or equal to 60 mass% from the viewpoints of extending the time required for curing and ensuring good operation time during impression collection.
  • the curing agent may further contain a gelling agent other than calcium sulfate.
  • gelling agents other than calcium sulfate include calcium sulfate hemihydrates, calcium sulfate dihydrates, calcium sulfate non-hydrates, and magnesium sulfates.
  • the content of the gelling agent (including calcium sulfate) in the curing agent is, for example, greater than or equal to 35 mass%, preferably greater than or equal to 40 mass%, and more preferably greater than or equal to 45 mass%.
  • the content of the gelling agent (including calcium sulfate) in the curing agent is, for example, less than or equal to 70 mass%, preferably less than or equal to 65 mass%, and more preferably less than or equal to 60 mass%.
  • the metal oxide particles function as a surface modifier that makes the surface of the dental impression material smooth to improve impression accuracy and mold releasability.
  • the metal oxide particles include at least magnesium oxide particles and may further include, for example, zinc oxide particles, in addition to the magnesium oxide particles.
  • the specific surface area of the magnesium oxide particles is greater than or equal to 0.01 m 2 /g, preferably greater than or equal to 0 03 m 2 /g, and more preferably greater than or equal to 0.05 m 2 /g. In a case where the specific surface area of the magnesium oxide particles is within this range, when the impression material cures, the surface of the impression material is likely to be solidified smoothly As a result, adhesion to the tooth or the like is less likely to occur, and the impression accuracy and mold releasability are further improved.
  • the specific surface area of the magnesium oxide particles is less than or equal to 2 m 2 /g, preferably less than or equal to 1.6 m 2 /g, and more preferably less than or equal to 1.2 m 2 /g. When the specific surface area of the magnesium oxide particles is within this range, the temporal stability is further improved.
  • the term “specific surface area of the magnesium oxide particles” used herein indicates a value measured by a nitrogen adsorption method.
  • the average particle size of the magnesium oxide particles is not particularly limited as long as the magnesium oxide particles function as a surface modifier, and the average particle size is, for example, greater than or equal to 10 pm, preferably greater than or equal to 13 pm, and more preferably greater than or equal to 15 pm. Further, the average particle size of the magnesium oxide particles may be, for example, less than or equal to 35 pm, preferably less than or equal to 33 pm, and more preferably less than or equal to 30 pm.
  • the term “average particle size of the magnesium oxide particles” used herein indicates a value measured by a laser diffraction method.
  • the content of the metal oxide particles in the curing agent is, for example, greater than or equal to 4 mass%, preferably greater than or equal to 6 mass%, and more preferably greater than or equal to 8 mass%, from the viewpoint of surface smoothness of the impression material.
  • the content of the metal oxide particles in the curing agent is, for example, less than or equal to 15 mass%, preferably less than or equal to 12 mass%, and more preferably less than or equal to 10 mass%, from the viewpoint of reactivity.
  • the proportion of magnesium oxide particles in the metal oxide particles is, for example, greater than or equal to 30 mass%, preferably greater than or equal to 40 mass%, and more preferably greater than or equal to 45 mass%, from the viewpoint of surface smoothness. Further, the proportion of magnesium oxide particles in the metal oxide particles is, for example, less than or equal to 65 mass%, preferably less than or equal to 60 mass%, and more preferably less than or equal to 55 mass%, from the viewpoint of surface smoothness. Examples of metal oxide particles other than magnesium oxide particles include zinc oxide particles.
  • the average particle size of these metal oxide particles is not particularly limited as long as the metal oxide particles function as a surface modifier, and may be, for example, an average particle size equivalent to that of the magnesium oxide particles described above.
  • the inorganic fluorine compound functions as a surface modifier that makes the surface of the dental impression material smooth to improve impression accuracy.
  • examples of inorganic fluorine compounds include potassium hexafluorotitanate and potassium fluorosilicate.
  • potassium hexafluorotitanate is preferable from the viewpoint of improving impression accuracy
  • the content of the inorganic fluorine compound in the curing agent is, for example, greater than or equal to 0.4 mass%, preferably greater than or equal to 0.6 mass%, and more preferably greater than or equal to 0.8 mass%, from the viewpoint of obtaining more favorable impression accuracy. Further, the content of the inorganic fluorine compound in the curing agent is, for example, less than or equal to 2 mass%, preferably less than or equal to 1.5 mass%, and more preferably less than or equal to 1.2 mass%, from the viewpoint of surface properties of the impression material.
  • the curing agent includes a liquid paraffin as a solvent from the viewpoints of good hydrophobicity, ease of availability and handling, safety to the living body, and the like.
  • the content of the liquid paraffin in the curing agent is, for example, greater than or equal to 20 mass%, preferably greater than or equal to 25 mass%, and more preferably greater than or equal to 30 mass%, from the viewpoint of paste fluidity. Further, the content of the liquid paraffin in the curing agent is, for example, less than or equal to 45 mass%, preferably less than or equal to 40 mass%, and more preferably less than or equal to 35 mass%, from the viewpoint of paste fluidity.
  • the curing agent may further contain a solvent such as hydrocarbons other than liquid paraffin, alcohols, phenols, fatty acids or esters thereof, hydrophobic polymers, or polyethers, as needed
  • hydrocarbons examples include aliphatic chain hydrocarbons such as hexane, heptane, octane, nonane, decane, undecane, dodecane, tridecane, tetradecane, pentadecane, kerosene, 2,7- dimethyloctane, 1 -octene; and alicyclic hydrocarbons such as cycloheptane and cyclononane.
  • aliphatic chain hydrocarbons such as hexane, heptane, octane, nonane, decane, undecane, dodecane, tridecane, tetradecane, pentadecane, kerosene, 2,7- dimethyloctane, 1 -octene
  • alicyclic hydrocarbons such as cycloheptane and cyclononane.
  • alcohols include saturated fatty alcohols such as 1-hexanol and 1-octanol; unsaturated fatty alcohols such as citronellol and oleyl alcohol; and aromatic alcohols such as benzyl alcohol.
  • phenols include cresol.
  • fatty acids or esters thereof include saturated fatty acids such as hexanoic acid, and octanoic acid; unsaturated fatty acids such as oleic acid and linoleic acid; and fatty acid esters such as ethyl octanoate, dibutyl phthalate, and glyceride oleate.
  • hydrophobic polymers examples include polysiloxane.
  • polyethers include linear or branched polyethers, and preferably examples thereof include polyalkylene glycols
  • polyalkylene glycols include polyethylene glycol and polypropylene glycol, and, among them, polyethylene glycol is preferable in view of having excellent hydrophilicity.
  • the curing agent may further include a surfactant, a surface modifier other than the metal oxide particles, a surface modifier other than the inorganic fluorine compound, a colorant, a filler, a metal salt, or the like.
  • surfactants examples include anionic surfactants (e.g., alkyl sulfonates, alkyl benzene sulfonates, alkyl ether carboxylates, etc.); cationic surfactants (e.g , alkyl amine salts, quaternary ammonium salts, etc.), amphoteric surfactants (e.g., aminocarboxylates, etc ), and nonionic surfactants (e.
  • anionic surfactants e.g., alkyl sulfonates, alkyl benzene sulfonates, alkyl ether carboxylates, etc.
  • cationic surfactants e.g , alkyl amine salts, quaternary ammonium salts, etc.
  • amphoteric surfactants e.g., aminocarboxylates, etc
  • nonionic surfactants e.
  • polyoxyethylene alkyl ethers polyoxyethylene alkyl phenyl ethers, polyoxyethylene-polyoxypropylene block polymers, polyoxyethylene glycerin fatty acid esters, polyoxy glycerin fatty acid esters, sorbitan fatty acid esters, sucrose esters, polyoxydiethylene alkylamines, block polymers of polysiloxanes and polyoxyethylenes, etc.).
  • colorants examples include red 226, red 3, blue 1, and green 3.
  • the amount of the colorant in 100 mass% of the curing agent is from about 0.01 mass% to about 1.0 mass%.
  • the dental impression material according to the present embodiment includes: a base material containing an alkali metal alginate and water; and the curing agent.
  • alkali metal alginates include a potassium salt of alginic acid and a sodium salt of alginic acid.
  • the content of the alkali metal alginate in the base material is, for example, greater than or equal to 1 mass%, preferably greater than or equal to 2 mass%, and more preferably greater than or equal to 3 mass%. Further, the content of the alkali metal alginate in the base material is, for example, less than or equal to 10 mass%, preferably less than or equal to 8 mass%, and more preferably less than or equal to 7 mass%.
  • the water may be purified water, deionized water, or the like.
  • the content of water in the base material is preferably greater than or equal to 50 mass%, more preferably greater than or equal to 55 mass%, and still more preferably greater than or equal to 60 mass%, from the viewpoints of avoiding the viscosity of the base material from becoming too high and facilitating the kneading of the base material and the curing agent and the application of the impression material (i.e., impression collection)
  • the content of water in the base material is preferably less than or equal to 90 mass%, more preferably less than or equal to 85 mass%, and still more preferably less than or equal to 80 mass%, from the viewpoints of avoiding the viscosity of the base material from becoming too low, facilitating the kneading of the base material and the curing agent and the application of the impression material, and further improving the physical properties of the impression material.
  • the base material may further contain a filler, a surfactant, a preservative, a curing retardant, a perfume material, and the like as components other than those described above.
  • the impression material kit includes: a first container including a base material containing an alkali metal alginate and water; and a second container including the curing agent.
  • the first container and the second container are not particularly limited as long as these containers can be hermetically sealed.
  • the first container and the second container each may be, for example, a tube-shaped, sausage-shaped, or aluminum-foil bag-shaped lidded container.
  • the base material and the curing agent can be produced by, for example, a method in which blending components are mixed in a known stirring mixer.
  • a ball mill, a ribbon mixer, a co-kneader, an internal mixer, a screw kneader, a Henschel mixer, a universal mixer, a Lodige mixer, a butterfly mixer, or the like can be used as the stirring mixer.
  • the dental impression material can be provided as a combination of a base material produced as described above and a curing agent.
  • the base material and the curing agent are each provided in a state of being encapsulated in a package, and a dental impression material paste is provided by mounting the packages to a known automated kneader to automatically knead the base material and the curing agent at a predetermined ratio.
  • the blending components (base material) shown in Table 1 and the blending components (curing agent) shown in Table 2 were mixed in an ordinary manner so that air bubbles did not occur at room temperature, thereby obtaining a uniform base material paste and a uniform curing agent paste.
  • the curing agent paste immediately after preparation (hereinafter referred to as before aging) was filled into an aluminum film, sealed, and placed in an environment at a temperature of 40°C and a humidity of 75% for 8 weeks to prepare an aged curing agent paste.
  • the base material paste immediately after preparation (hereinafter referred to as before aging) was filled into an aluminum film, sealed, and placed in an environment at a temperature of 40°C and a humidity of 75% for 8 weeks to prepare an aged base material paste.
  • the following tests (2) and (3) were performed using the curing agent pastes before and after aging and the base material pastes before and after aging.
  • the base material paste before aging and the curing agent paste before aging as described above were mixed in an automated kneader, and the mixture was placed into a metal ring.
  • One end of an acrylic bar is slightly brought into contact with the uncured sample every 10 seconds after the start of the placing process, and this cycle is repeated until the impression material does not adhere to the bar.
  • the time was recorded as the initial curing time (in accordance with JIS T6505 2016 item 7.2).
  • the initial curing time of the impression material was recorded in the same manner as described above.
  • the ratio of the initial curing time after aging to the initial curing time before aging was determined, and defined as “variation of initial curing time (%)”. The results are shown in Tables 2 and 3.
  • the base material paste obtained above was mixed with each of the curing agent pastes before and after aging, described in (1) above, and placed into a rigid ring mold (in accordance with ISO21563: 2013,7.1.1a). After mixing began, a cylindrical polymethyl methacrylate bar was pressed onto the surface of the impression material (in accordance with ISO21563 : 2013, 7.2. lb) The time until the impression material was not marked with the bar was used as the gelling time. The ratio of gelling time after aging to the gelling time before aging was determined, and defined as “variation of gelling time (%)”. The results are shown in Tables 2 and 3.

Abstract

To provide a curing agent for an alginate-based dental impression material in which changes in curing time due to long-term storage can be sufficiently suppressed. A curing agent for an alginate-based dental impression material includes: calcium sulfate; metal oxide particles; an inorganic fluorine compound; and a liquid paraffin, in which the metal oxide particles include magnesium oxide particles, and the magnesium oxide particles have a specific surface area of 0.01 to 2 m2/g.

Description

CURING AGENT FOR ALGINATE-BASED
DENTAL IMPRESSION MATERIAL, ALGINATE-BASED
DENTAL IMPRESSION MATERIAL, AND IMPRESSION MATERIAL KIT
Technical Field
The present invention relates to a curing agent for an alginate-based dental impression material, an alginate-based dental impression material, and an impression material kit.
Background
Alginate-based impression materials are known to be widely used as dental impression materials, and magnesium oxide is often added to curing agents for curing the impression materials. Usually, the magnesium oxide contained in curing agents is required to have high reactivity. Therefore, a magnesium oxide having a large specific surface area is commonly added to curing agents.
For example, Patent Literature 1 discloses a method of producing a curing agent for an impression material that has little delay in curing time due to long-term storage by pre-heating a mixture of highly reactive magnesium oxide having a specific surface area of 100 to 200 m2/g and a surfactant to a temperature of 40 to 150°C.
Summary Technical Problem
However, there has been a problem such that when magnesium oxide having a large specific surface area is used, it is difficult to maintain the duration (i.e., curing time) of the impression collection in an appropriate range due to long-term storage (temporal stability is insufficient). Further, the method described in Patent Literature 1 has problems such that it takes 1 hour to several days for heat treatment and the manufacturing efficiency is poor.
An object of the present invention is to provide a curing agent for an alginate-based dental impression material in which changes in curing time due to long-term storage are sufficiently suppressed. Another object of the present invention is to provide an alginate-based dental impression material including the curing agent and an impression material kit.
Solution to Problem
One aspect of the present invention relates to a curing agent for an alginate-based dental impression material including: calcium sulfate; metal oxide particles; an inorganic fluorine compound; and a liquid paraffin, in which the metal oxide particles include magnesium oxide particles, and the magnesium oxide particles have a specific surface area of 0.01 to 2 m2/g.
In one aspect, the metal oxide particles may further include zinc oxide particles.
In one aspect, the metal oxide particles may have a content of 4 to 10 mass%.
Another aspect of the present invention relates to an alginate-based dental impression material including: a base material containing an alkali metal alginate and water; and the curing agent.
Still another aspect of the present invention relates to an impression material kit including: a first container including a base material containing an alkali metal alginate and water; and a second container including the curing agent.
Advantageous Effects of Invention
According to the present invention, it is possible to provide a curing agent for an alginate-based dental impression material in which changes in curing time due to long-term storage can be sufficiently suppressed. Further, according to the present invention, there is provided an alginate-based dental impression material and an impression material kit which includes the curing agent and in which changes in curing time due to long-term storage are sufficiently suppressed as well as an impression kit.
Detailed Description
Preferred embodiments of the present invention are described below. However, the present invention is not limited to the following embodiment.
Curing Agent
The curing agent for an alginate-based dental impression material according to the present embodiment includes calcium sulfate, metal oxide particles, an inorganic fluorine compound, and a liquid paraffin. In the present embodiment, the magnesium oxide particles contained in the metal oxide particles have a specific surface area of 0.01 to 2 m2/g.
According to this type of curing agent, changes in curing time due to long-term storage (particularly shortening of the curing time) can be sufficiently suppressed.
The reason for this effect being exhibited is not necessarily limited, but is considered as follows. Based on the findings of the present inventors, in a curing agent containing magnesium oxide particles and an inorganic fluorine compound, the magnesium oxide and the inorganic fluorine compound may react with small amounts of moisture present in the curing agent to form magnesium fluoride. Specifically describing, as an example, a case where the inorganic fluorine compound is potassium hexafluorotitanate, magnesium oxide reacts with water to form magnesium hydroxide (Formula (1)); potassium hexafluorotitanate reacts with water to form hydrogen fluoride (Formula (2)), and magnesium hydroxide reacts with hydrogen fluoride to form magnesium fluoride. It is believed that this magnesium fluoride contributes to curing of the impression material, thereby changing the curing time.
MgO+H2O >Mg(OH)2 (1)
K2TiF6+2H2O^2KF+TiO2+4HF (2) Mg(OH)2+2HF- MgF2+2H2O (3)
In the curing agent of the present embodiment, a hydration reaction (Formula (1)) during long-term storage is suppressed, because magnesium oxide particles have a suitable specific surface area. Consequently, the reaction shown in Formula (3) above is suppressed even in the presence of the inorganic fluorine compound In other words, it is considered that, in the curing agent of the present embodiment, it is possible to reduce the production of magnesium fluoride involved in promoting crosslinking of alkali metal alginate, and therefore, it is possible to suppress changes in curing time due to long-term storage.
The calcium sulfate may be an anhydrate or a hydrate, and examples of anhydrates and hydrates include calcium sulfate anhydrides, calcium sulfate hemihydrates, and calcium sulfate dihydrates. From the viewpoint of making it easier to control the physical properties of the dental impression material after curing, calcium sulfate hemihydrates are preferable.
The content of calcium sulfate in the curing agent is, for example, greater than or equal to 35 mass%, preferably greater than or equal to 40 mass%, and more preferably greater than or equal to 45 mass%, from the viewpoint of obtaining an excellent function as a calcium sulfate gelling agent. Further, the content of calcium sulfate in the curing agent is, for example, less than or equal to 70 mass%, preferably less than or equal to 65 mass%, and more preferably less than or equal to 60 mass% from the viewpoints of extending the time required for curing and ensuring good operation time during impression collection.
The curing agent may further contain a gelling agent other than calcium sulfate. Examples of gelling agents other than calcium sulfate include calcium sulfate hemihydrates, calcium sulfate dihydrates, calcium sulfate non-hydrates, and magnesium sulfates. The content of the gelling agent (including calcium sulfate) in the curing agent is, for example, greater than or equal to 35 mass%, preferably greater than or equal to 40 mass%, and more preferably greater than or equal to 45 mass%. Further, the content of the gelling agent (including calcium sulfate) in the curing agent is, for example, less than or equal to 70 mass%, preferably less than or equal to 65 mass%, and more preferably less than or equal to 60 mass%. The metal oxide particles function as a surface modifier that makes the surface of the dental impression material smooth to improve impression accuracy and mold releasability. The metal oxide particles include at least magnesium oxide particles and may further include, for example, zinc oxide particles, in addition to the magnesium oxide particles.
The specific surface area of the magnesium oxide particles is greater than or equal to 0.01 m2/g, preferably greater than or equal to 0 03 m2/g, and more preferably greater than or equal to 0.05 m2/g. In a case where the specific surface area of the magnesium oxide particles is within this range, when the impression material cures, the surface of the impression material is likely to be solidified smoothly As a result, adhesion to the tooth or the like is less likely to occur, and the impression accuracy and mold releasability are further improved. Further, the specific surface area of the magnesium oxide particles is less than or equal to 2 m2/g, preferably less than or equal to 1.6 m2/g, and more preferably less than or equal to 1.2 m2/g. When the specific surface area of the magnesium oxide particles is within this range, the temporal stability is further improved. The term “specific surface area of the magnesium oxide particles” used herein indicates a value measured by a nitrogen adsorption method.
The average particle size of the magnesium oxide particles is not particularly limited as long as the magnesium oxide particles function as a surface modifier, and the average particle size is, for example, greater than or equal to 10 pm, preferably greater than or equal to 13 pm, and more preferably greater than or equal to 15 pm. Further, the average particle size of the magnesium oxide particles may be, for example, less than or equal to 35 pm, preferably less than or equal to 33 pm, and more preferably less than or equal to 30 pm. The term “average particle size of the magnesium oxide particles” used herein indicates a value measured by a laser diffraction method.
The content of the metal oxide particles in the curing agent is, for example, greater than or equal to 4 mass%, preferably greater than or equal to 6 mass%, and more preferably greater than or equal to 8 mass%, from the viewpoint of surface smoothness of the impression material. The content of the metal oxide particles in the curing agent is, for example, less than or equal to 15 mass%, preferably less than or equal to 12 mass%, and more preferably less than or equal to 10 mass%, from the viewpoint of reactivity.
The proportion of magnesium oxide particles in the metal oxide particles is, for example, greater than or equal to 30 mass%, preferably greater than or equal to 40 mass%, and more preferably greater than or equal to 45 mass%, from the viewpoint of surface smoothness. Further, the proportion of magnesium oxide particles in the metal oxide particles is, for example, less than or equal to 65 mass%, preferably less than or equal to 60 mass%, and more preferably less than or equal to 55 mass%, from the viewpoint of surface smoothness. Examples of metal oxide particles other than magnesium oxide particles include zinc oxide particles. The average particle size of these metal oxide particles is not particularly limited as long as the metal oxide particles function as a surface modifier, and may be, for example, an average particle size equivalent to that of the magnesium oxide particles described above.
The inorganic fluorine compound functions as a surface modifier that makes the surface of the dental impression material smooth to improve impression accuracy. Examples of inorganic fluorine compounds include potassium hexafluorotitanate and potassium fluorosilicate. Among the inorganic fluorine compounds, potassium hexafluorotitanate is preferable from the viewpoint of improving impression accuracy
The content of the inorganic fluorine compound in the curing agent is, for example, greater than or equal to 0.4 mass%, preferably greater than or equal to 0.6 mass%, and more preferably greater than or equal to 0.8 mass%, from the viewpoint of obtaining more favorable impression accuracy. Further, the content of the inorganic fluorine compound in the curing agent is, for example, less than or equal to 2 mass%, preferably less than or equal to 1.5 mass%, and more preferably less than or equal to 1.2 mass%, from the viewpoint of surface properties of the impression material.
The curing agent includes a liquid paraffin as a solvent from the viewpoints of good hydrophobicity, ease of availability and handling, safety to the living body, and the like.
The content of the liquid paraffin in the curing agent is, for example, greater than or equal to 20 mass%, preferably greater than or equal to 25 mass%, and more preferably greater than or equal to 30 mass%, from the viewpoint of paste fluidity. Further, the content of the liquid paraffin in the curing agent is, for example, less than or equal to 45 mass%, preferably less than or equal to 40 mass%, and more preferably less than or equal to 35 mass%, from the viewpoint of paste fluidity.
The curing agent may further contain a solvent such as hydrocarbons other than liquid paraffin, alcohols, phenols, fatty acids or esters thereof, hydrophobic polymers, or polyethers, as needed
Examples of hydrocarbons include aliphatic chain hydrocarbons such as hexane, heptane, octane, nonane, decane, undecane, dodecane, tridecane, tetradecane, pentadecane, kerosene, 2,7- dimethyloctane, 1 -octene; and alicyclic hydrocarbons such as cycloheptane and cyclononane.
Examples of alcohols include saturated fatty alcohols such as 1-hexanol and 1-octanol; unsaturated fatty alcohols such as citronellol and oleyl alcohol; and aromatic alcohols such as benzyl alcohol. Examples of phenols include cresol. Examples of fatty acids or esters thereof include saturated fatty acids such as hexanoic acid, and octanoic acid; unsaturated fatty acids such as oleic acid and linoleic acid; and fatty acid esters such as ethyl octanoate, dibutyl phthalate, and glyceride oleate.
Examples of hydrophobic polymers include polysiloxane.
Examples of polyethers include linear or branched polyethers, and preferably examples thereof include polyalkylene glycols Examples of polyalkylene glycols include polyethylene glycol and polypropylene glycol, and, among them, polyethylene glycol is preferable in view of having excellent hydrophilicity.
The curing agent may further include a surfactant, a surface modifier other than the metal oxide particles, a surface modifier other than the inorganic fluorine compound, a colorant, a filler, a metal salt, or the like.
Examples of surfactants include anionic surfactants (e.g., alkyl sulfonates, alkyl benzene sulfonates, alkyl ether carboxylates, etc.); cationic surfactants (e.g , alkyl amine salts, quaternary ammonium salts, etc.), amphoteric surfactants (e.g., aminocarboxylates, etc ), and nonionic surfactants (e. g., polyoxyethylene alkyl ethers; polyoxyethylene alkyl phenyl ethers, polyoxyethylene-polyoxypropylene block polymers, polyoxyethylene glycerin fatty acid esters, polyoxy glycerin fatty acid esters, sorbitan fatty acid esters, sucrose esters, polyoxydiethylene alkylamines, block polymers of polysiloxanes and polyoxyethylenes, etc.).
Examples of colorants include red 226, red 3, blue 1, and green 3. In a preferred aspect, the amount of the colorant in 100 mass% of the curing agent is from about 0.01 mass% to about 1.0 mass%.
Dental Impression Material
The dental impression material according to the present embodiment includes: a base material containing an alkali metal alginate and water; and the curing agent.
Examples of alkali metal alginates include a potassium salt of alginic acid and a sodium salt of alginic acid.
The content of the alkali metal alginate in the base material is, for example, greater than or equal to 1 mass%, preferably greater than or equal to 2 mass%, and more preferably greater than or equal to 3 mass%. Further, the content of the alkali metal alginate in the base material is, for example, less than or equal to 10 mass%, preferably less than or equal to 8 mass%, and more preferably less than or equal to 7 mass%.
The water may be purified water, deionized water, or the like.
The content of water in the base material is preferably greater than or equal to 50 mass%, more preferably greater than or equal to 55 mass%, and still more preferably greater than or equal to 60 mass%, from the viewpoints of avoiding the viscosity of the base material from becoming too high and facilitating the kneading of the base material and the curing agent and the application of the impression material (i.e., impression collection) Further, the content of water in the base material is preferably less than or equal to 90 mass%, more preferably less than or equal to 85 mass%, and still more preferably less than or equal to 80 mass%, from the viewpoints of avoiding the viscosity of the base material from becoming too low, facilitating the kneading of the base material and the curing agent and the application of the impression material, and further improving the physical properties of the impression material.
The base material may further contain a filler, a surfactant, a preservative, a curing retardant, a perfume material, and the like as components other than those described above.
Impression Material Kit
The impression material kit according to the present embodiment includes: a first container including a base material containing an alkali metal alginate and water; and a second container including the curing agent.
The first container and the second container are not particularly limited as long as these containers can be hermetically sealed. The first container and the second container each may be, for example, a tube-shaped, sausage-shaped, or aluminum-foil bag-shaped lidded container.
Production of Base Material, Curing Agent, and Dental Impression Material
The base material and the curing agent can be produced by, for example, a method in which blending components are mixed in a known stirring mixer. A ball mill, a ribbon mixer, a co-kneader, an internal mixer, a screw kneader, a Henschel mixer, a universal mixer, a Lodige mixer, a butterfly mixer, or the like can be used as the stirring mixer. The dental impression material can be provided as a combination of a base material produced as described above and a curing agent. In a typical aspect, the base material and the curing agent are each provided in a state of being encapsulated in a package, and a dental impression material paste is provided by mounting the packages to a known automated kneader to automatically knead the base material and the curing agent at a predetermined ratio.
Examples
Hereinafter, the exemplified aspects of the present invention will be described more specifically with reference to examples. However, the present invention is not limited to the examples. Examples 2 to 4 and Comparative Examples 1 and 2 Preparation of Curing Agent Paste and Base Material Paste
The blending components (base material) shown in Table 1 and the blending components (curing agent) shown in Table 2 were mixed in an ordinary manner so that air bubbles did not occur at room temperature, thereby obtaining a uniform base material paste and a uniform curing agent paste.
Evaluation of Curing Time
(1) Sample Preparation
Regarding the curing agent paste described above, the curing agent paste immediately after preparation (hereinafter referred to as before aging) was filled into an aluminum film, sealed, and placed in an environment at a temperature of 40°C and a humidity of 75% for 8 weeks to prepare an aged curing agent paste. Regarding the base material paste, the base material paste immediately after preparation (hereinafter referred to as before aging) was filled into an aluminum film, sealed, and placed in an environment at a temperature of 40°C and a humidity of 75% for 8 weeks to prepare an aged base material paste. The following tests (2) and (3) were performed using the curing agent pastes before and after aging and the base material pastes before and after aging.
(2) Variation of Initial Curing Time
The base material paste before aging and the curing agent paste before aging as described above were mixed in an automated kneader, and the mixture was placed into a metal ring. One end of an acrylic bar is slightly brought into contact with the uncured sample every 10 seconds after the start of the placing process, and this cycle is repeated until the impression material does not adhere to the bar. The time was recorded as the initial curing time (in accordance with JIS T6505 2016 item 7.2). Regarding the base material paste after aging and the curing agent paste after aging, the initial curing time of the impression material was recorded in the same manner as described above. The ratio of the initial curing time after aging to the initial curing time before aging was determined, and defined as “variation of initial curing time (%)”. The results are shown in Tables 2 and 3.
(3) Variation of Gelling Time (%)
The base material paste obtained above was mixed with each of the curing agent pastes before and after aging, described in (1) above, and placed into a rigid ring mold (in accordance with ISO21563: 2013,7.1.1a). After mixing began, a cylindrical polymethyl methacrylate bar was pressed onto the surface of the impression material (in accordance with ISO21563 : 2013, 7.2. lb) The time until the impression material was not marked with the bar was used as the gelling time. The ratio of gelling time after aging to the gelling time before aging was determined, and defined as “variation of gelling time (%)”. The results are shown in Tables 2 and 3.
Table 1
Figure imgf000010_0001
Table 2
Figure imgf000010_0002
Table 3
Figure imgf000011_0001

Claims

What is claimed is:
1 . A curing agent for an alginate-based dental impression material comprising: calcium sulfate; metal oxide particles; an inorganic fluorine compound; and a liquid paraffin wherein the metal oxide particles include magnesium oxide particles, and the magnesium oxide particles have a specific surface area of 0.01 to 2 m2/g.
2 The curing agent according to claim 1, wherein the metal oxide particles further include zinc oxide particles.
3. The curing agent according to claim 1 or 2, wherein the metal oxide particles have a content of 4 to 10 mass%.
4. An alginate-based dental impression material comprising: a base material containing an alkali metal alginate and water; and the curing agent described in any one of claims 1 to 3.
5. An impression material kit comprising: a first container including a base material containing an alkali metal alginate and water; and a second container including the curing agent described in any one of claims 1 to 3.
PCT/IB2021/061714 2020-12-23 2021-12-14 Curing agent for alginate-based dental impression material, alginate-based dental impression material, and impression material kit WO2022137020A1 (en)

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH09315924A (en) * 1996-05-23 1997-12-09 Tokuyama Corp Production of curing agent for impression material
US20020058725A1 (en) * 2000-09-08 2002-05-16 Gc Corporation Dental alginate impression material
US20060213396A1 (en) * 2005-03-28 2006-09-28 Gc Corporation Pasty dental alginate impression material composition

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH09315924A (en) * 1996-05-23 1997-12-09 Tokuyama Corp Production of curing agent for impression material
US20020058725A1 (en) * 2000-09-08 2002-05-16 Gc Corporation Dental alginate impression material
US20060213396A1 (en) * 2005-03-28 2006-09-28 Gc Corporation Pasty dental alginate impression material composition

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
DE LANGE MARTIJN F ET AL: "Adsorptive characterization of porous solids: Error analysis guides the way", MICROPOROUS AND MESOPOROUS MATERIALS, ELSEVIER, AMSTERDAM ,NL, vol. 200, 3 September 2014 (2014-09-03), pages 199 - 215, XP029050753, ISSN: 1387-1811, DOI: 10.1016/J.MICROMESO.2014.08.048 *

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