Dental glass ionomer cement composition

Abstract

To provide a dental glass ionomer cement composition that exhibits little stringiness of the mixed product, allows shaping operations to be performed soon after mixing, has excellent cavity filling properties and application properties to dental prosthetic devices, and has good mixability and mechanical properties.SOLUTION: Provided is a dental glass ionomer cement composition, comprising: (a) an acid-reactive glass powder; (b) a polyalkenoic acid; (c) water; and (d) 0.075 mass% or more and 15 mass% or less of a porous inorganic filler; the (d) porous inorganic filler having a core that is an inorganic particle composed solely of silicon dioxide or composed of silicon dioxide and an oxide containing one or more metal elements.SELECTED DRAWING: None

Description

[Technical Field]

[0001] The present invention relates to a dental glass ionomer cement composition for filling and restoring teeth whose shape has been partially damaged, mainly due to caries, fractures, etc., or for bonding or affixing dental prosthetic devices to teeth whose shape has been damaged. [Background technology]

[0002] In clinical dentistry, direct restoration, in which filling materials are placed in the teeth, and indirect restoration, in which dental prostheses are attached and / or bonded to the teeth using adhesive materials, are performed to restore the aesthetic and functional appearance of teeth that have been partially damaged by caries, fractures, etc. Dental glass ionomer cement is one of the most representative filling and adhesive materials, and its greatest feature is its sustained release of fluoride ions, which strengthens tooth structure and inhibits secondary caries.

[0003] Dental glass ionomer cements are primarily composed of acid-reactive glass powders, typically fluoroaluminosilicate glass powders, polyalkenoic acid, and water, and are generally in two-component forms, such as powder-liquid or two-paste types. These types of dental glass ionomer cements are prepared by hand or mechanical mixing immediately before use for powder-liquid types, and by hand or automatic mixing using a mixing tip for two-paste types. Dental glass ionomer cements mixed in this way are prepared by the action of acidic compounds, such as polyalkenoic acid, on the acid-reactive glass powder in the presence of water, converting polyvalent metal ions (Al 3+ , Ca 2+ , Sr 2+ The polyvalent metal ions and the acidic groups of the polyalkenoic acid are eluted, and the eluted polyvalent metal ions form an ionic bond (acid-base reaction) with the acidic groups of the polyalkenoic acid, forming a crosslinked structure between the polyalkenoic acids via the polyvalent metal ions, which then hardens the resin.

[0004] Various techniques have been proposed to improve the properties of dental glass ionomer cement by adding additives to the main components. For example, Patent Document 1 discloses a technique for improving the transparency of the cured product by adding a polyvalent metal compound to a dental glass ionomer cement composition. Patent Document 2 also discloses a technique for improving the mechanical properties of a dental glass ionomer cement composition by adding a water-reducing agent. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Publication No. 2019-137618 [Patent Document 2] Japanese Patent Application Publication No. 2023-9286 Summary of the Invention [Problem to be solved by the invention]

[0006] Since dental glass ionomer cement contains a highly viscous aqueous solution of polyalkenoic acid in its composition, the kneaded material tends to become stringy immediately after kneading. This stringiness can adversely affect operability during filling and cementation, and is particularly susceptible to this effect during filling operations. For example, after the kneaded material is filled into a cavity using a dental instrument such as a dental syringe or dental syringe, if the kneaded material becomes stringy when the dental instrument is removed from the kneaded material, the kneaded material may adhere to the surrounding tooth structure or oral mucosa. In such cases, the adhesions must be carefully removed, making the operation complicated.

[0007] In addition, dental glass ionomer cement begins to harden due to the acid-base reaction immediately after mixing, so regardless of the properties of the mixed material, the stringiness of the mixed material decreases after a certain period of time, making it easier to perform shaping operations. Therefore, when shaping the mixed material filled into the cavity, the shaping operation is performed after waiting until the stringiness of the mixed material decreases. On the other hand, if the mixed material is significantly stringy and it takes a long time for the stringiness to decrease, the treatment time will be longer and the risk of the treatment site being contaminated by saliva will increase.

[0008] Methods for reducing stringiness of the kneaded material immediately after kneading include increasing the proportion of acid-reactive glass powder contained in the dental glass ionomer cement or increasing the particle size. However, increasing the proportion of acid-reactive glass powder increases the viscosity of the kneaded material, which may result in a decrease in kneadability. Furthermore, increasing the particle size of the acid-reactive glass powder may decrease the acid-base reactivity of the acid-reactive glass powder and polyalkenoic acid, which may result in a decrease in the mechanical properties of the cured product.

[0009] Therefore, an object of the present invention is to provide a dental glass ionomer cement composition that exhibits less stringiness of the kneaded product than conventional techniques, has excellent cavity filling properties and application properties to dental prosthetic devices, and is ready for shaping operations soon after kneading, while also exhibiting good kneading properties and mechanical properties. [Means for solving the problem]

[0010] As a result of intensive research conducted by the present inventors to address these challenges, they discovered that by incorporating a specific porous inorganic filler in a specific range into a dental glass ionomer cement composition, the kneaded product has less stringiness, excellent cavity filling properties and excellent application properties to dental prosthetic devices, and can be quickly shaped after kneading, while also exhibiting good kneading properties and excellent mechanical properties, which led to the completion of the present invention.

[0011] That is, the above problem can be solved by using the following component composition. (a) acid-reactive glass powder; (b) polyalkenoic acid, (c) water, and (d) porous inorganic filler: 0.075% by mass or more and 15% by mass or less; A dental glass ionomer cement composition comprising: (d) a porous inorganic filler; and (e) a porous inorganic filler having a core composed of only silicon dioxide, or an inorganic particle composed of silicon dioxide and an oxide containing one or more metal elements. [Effects of the Invention]

[0012] According to the present invention, a dental glass ionomer cement composition can be provided which exhibits little stringiness immediately after mixing, which allows for excellent cavity filling properties and excellent application properties to dental prosthetic devices, and which is ready for shaping operations soon after mixing, thereby shortening treatment time, while also exhibiting good mixing properties and mechanical properties. DETAILED DESCRIPTION OF THE INVENTION

[0013] In the present invention, the porous inorganic filler (d) has a 50% particle diameter (D50) in the range of 0.1 μm to 10 μm, a pore volume of 0.01 cc / g to 1.00 cc / g, and a specific surface area of ​​5 m 2 / g or more 500m 2 / g or less.

[0014] In the present invention, (a) 44% by mass or more and 80% by mass or less of an acid-reactive glass powder; (b) polyalkenoic acid 7.5% by mass or more and 20% by mass or less, (c) Water 7% by mass or more and 32% by mass or less, and (d) porous inorganic filler: 0.075% by mass or more and 15% by mass or less; may include:

[0015] In the present invention, the time required for starting shaping of the dental glass ionomer cement composition can be within 30 seconds.

[0016] The present invention will be described in detail below. As used herein, the term "dental glass ionomer cement" refers to a dental material that does not contain compounds having polymerizable groups, such as polymerizable monomers, oligomers having polymerizable groups, and / or polymers having polymerizable groups, with the intention of hardening through a polymerization reaction, but rather hardens primarily through an acid-base reaction that occurs between an acid-reactive glass powder and a polyalkenoic acid in the presence of water.

[0017] As used herein, the term "polyalkenoic acid" refers to a polymer containing an ethylenically unsaturated monomer unit having an acidic group. Furthermore, as used herein, "(meth)acrylate" refers to both acrylate and methacrylate, and "(meth)acryloyl" refers to both acryloyl and methacryloyl.

[0018] In this specification, the degree of stringiness of the kneaded material was evaluated by the following method. That is, a kneaded material of a dental glass ionomer cement composition (defined as a total amount of 360 mg) was filled into a simulated cavity of a certain size, the excess material was scraped off to make the surface flat, and 10 seconds after the end of kneading, the cylindrical tip of a metal instrument (diameter: φ1.5 mm) was immersed vertically 0.5 mm into the kneaded material, and the degree of stringiness was confirmed when the instrument was immediately gently pulled up. This test was conducted in an environment of a temperature of 23±1°C and a humidity of 50±10%. If the kneaded material did not string, or if there was only slight stringiness, it was judged to have "good kneaded material properties with little stringiness."

[0019] The degree of stringiness of the kneaded product was also evaluated using the same method, and the time when the kneaded product had "good properties with little stringiness" was taken as the "time when shaping could begin."

[0020] In addition, as used herein, the term "50% particle size (D50)" refers to the particle size at which the cumulative value from the small particle size side reaches 50% in a volume-based particle size distribution measured using a laser diffraction / scattering particle size distribution analyzer. This document relates to a kneading device for capsules for dental restorative materials and a capsule for mixing and dispensing dental materials. Dental cement capsules have traditionally been widely used in the dental field as containers for two-component mixed-kneading dental cements. When using dental cement capsules, the two components are mixed and kneaded using an automatic mixer such as a capsule mixer, and then a filling tool such as an applier is attached to the capsule, allowing the dental cement inside the capsule to be filled into an application site such as a cavity. Dental cement capsules have traditionally been widely used in the dental field as containers for two-component mixed-kneading dental cements. When using dental cement capsules, the two components are mixed and kneaded using an automatic mixer such as a capsule mixer, and then a filling tool such as an applier is attached to the capsule, allowing the dental cement inside the capsule to be filled into an application site such as a cavity.

[0021] In addition, in this specification, the term "pore volume" refers to a value determined by the BJH method from an adsorption isotherm obtained by a nitrogen adsorption method.

[0022] In this specification, the term "specific surface area" refers to a value determined by the BET method from an adsorption isotherm obtained by a nitrogen adsorption method.

[0023] The dental glass ionomer cement composition of the present invention can be used, for example, in a kneading device for capsules for tooth restorative materials or in a capsule for mixing and dispensing dental materials. Conventionally, in the dental field, dental cement capsules have been widely used as containers for two-component mixed-kneading dental cements. When using dental cement capsules, the two components are mixed and kneaded using an automatic mixer such as a capsule mixer, and then the capsule is attached to a filling tool such as an applier, and the kneaded material inside the capsule is applied to the treatment site such as a cavity.

[0024] The dental glass ionomer cement composition of the present invention comprises (a) an acid-reactive glass powder, (b) a polyalkenoic acid, (c) water, and a specific (d) porous inorganic filler as essential components, with the (d) porous inorganic filler blended in a specific amount. This component configuration results in less stringiness of the kneaded product, excellent cavity fillability, and excellent application to dental prosthetic devices. Furthermore, the composition allows for shaping operations to be performed quickly after kneading, and exhibits good kneading properties and excellent mechanical properties. The components of the present invention are described in detail below.

[0025] <(a) Acid-reactive glass powder> The (a) acid-reactive glass powder that can be used in the dental glass ionomer cement composition of the present invention is a component that contributes to the hardening of the composition and must contain an acid-reactive element such as a metal element and fluorine. The (a) acid-reactive glass powder contains an acid-reactive element, which, in the presence of (c) water, undergoes an acid-base reaction with the acidic group of (b) the polyalkenoic acid. Specific examples of acid-reactive elements include, but are not limited to, sodium, potassium, calcium, strontium, barium, lanthanum, aluminum, and zinc. One or more of these acid-reactive elements may be present, and the amount of each element is not particularly limited.

[0026] Furthermore, in order to impart radiopacity to the dental glass ionomer cement composition of the present invention, it is preferable that the (a) acid-reactive glass powder contains a radiopaque element. Specific examples of radiopaque elements include, but are not limited to, strontium, lanthanum, zirconium, titanium, yttrium, ytterbium, tantalum, tin, tellurium, tungsten, and bismuth. Furthermore, there are no particular limitations on the other elements contained in the (a) acid-reactive glass powder, and the (a) acid-reactive glass powder of the present invention can contain a variety of elements.

[0027] (a) Examples of acid-reactive glass powders include, but are not limited to, aluminosilicate glass, borosilicate glass, aluminoborate glass, boroaluminosilicate glass, phosphate glass, borate glass, and silicate glass containing the above-mentioned acid-reactive elements, fluorine, and radiopaque elements.

[0028] Furthermore, the particle shape of the (a) acid-reactive glass powder is not particularly limited, and any particle shape such as spherical, needle-like, plate-like, crushed, scale-like, etc. can be used without any limitation. These (a) acid-reactive glass powders can be used alone or in combination.

[0029] The method for producing these (a) acid-reactive glass powders is not particularly limited, and any of the methods such as a melting method, a vapor phase method, and a sol-gel method can be used without any problems. Among these, it is preferable to use the (a) acid-reactive glass powder produced by the melting method or the sol-gel method, which allows for easy control of the type and content of elements.

[0030] (a) The acid-reactive glass powder can be used after being pulverized to a desired particle size. The pulverization method is not particularly limited, and either wet or dry pulverization can be used. Specifically, the raw glass can be pulverized using a high-speed rotary mill such as a hammer mill or turbo mill, a container-driven mill such as a ball mill, planetary mill, or vibration mill, a media-agitating mill such as an attritor or bead mill, or a jet mill, and the particle size can be appropriately adjusted depending on the desired properties to be imparted to the dental glass ionomer cement composition of the present invention.

[0031] The 50% particle size (D50) of the (a) acid-reactive glass powder is preferably 0.5 μm or more and 20 μm or less, and more preferably 2.5 μm or more and 20 μm or less. The dental glass ionomer cement composition of the present invention may contain only acid-reactive glass powder having a 50% particle size (D50) of 0.5 μm or more and 20 μm or less as the (a) acid-reactive glass powder.

[0032] (a) If the 50% particle size (D50) of the acid-reactive glass powder is less than 0.5 μm, its surface area increases, making it impossible to incorporate a large amount into the composition, which may result in reduced mechanical properties. Furthermore, the working time may be significantly shortened. (a) If the 50% particle size (D50) of the acid-reactive glass powder is greater than 20 μm, the mechanical properties may be reduced. Furthermore, when used as a filling material, the material surface may become rough after polishing, which may lead to increased discoloration in the oral cavity. When used as a bonding material, the coating thickness may increase, causing the bonded and / or adhered dental prosthetic device to lift, resulting in the dental prosthetic device not fitting as intended.

[0033] In order to adjust the handling properties, hardening characteristics, mechanical properties, etc. of the dental glass ionomer cement composition of the present invention, (a) the acid-reactive glass powder can be subjected to various surface treatments, heat treatments, or aggregation treatments in a liquid phase or a gas phase, etc., within a range that does not adversely affect the acid-base reaction with (b) the polyalkenoic acid. These treatments can be performed alone or in combination, and the order in which each treatment is performed is not particularly limited. Among these, surface treatments and heat treatments are preferred because they allow for easy control of various properties and are also highly productive.

[0034] Specific examples of surface treatments of the (a) acid-reactive glass powder include washing with an acid such as phosphoric acid or acetic acid, surface treatment with an acidic compound such as tartaric acid or a polycarboxylic acid, surface treatment with a fluoride such as aluminum fluoride, and surface treatment with a silane compound such as (meth)acryloyloxymethyltrimethoxysilane, 3-(meth)acryloyloxypropyltrimethoxysilane, 8-(meth)acryloyloxyoctyltrimethoxysilane, 3-mercaptopropyltrimethoxysilane, tetramethoxysilane, tetraethoxysilane, a partially hydrolyzed oligomer of tetramethoxysilane, and a partially hydrolyzed oligomer of tetraethoxysilane. Surface treatments are not limited to those described above, and these surface treatments can be used alone or in combination. Furthermore, the amount of surface treatment agent relative to the (a) acid-reactive glass powder when performing the surface treatment is not particularly limited, and can be adjusted appropriately depending on the particle size and desired properties of the (a) acid-reactive glass powder.

[0035] (a) A specific example of the heat treatment of the acid-reactive glass powder is a treatment method in which the powder is heated at 200°C to 800°C for 1 hour to 72 hours using an electric furnace or the like. The heat treatments that can be used in the present invention are not limited to those described above, and the treatment process can also be a treatment at a single temperature or a multi-stage treatment at multiple temperatures.

[0036] The content of (a) acid-reactive glass powder is preferably 44% by mass or more and 80% by mass or less, and more preferably 63% by mass or more and 80% by mass or less, of the total dental glass ionomer cement composition of the present invention. If the content of (a) acid-reactive glass powder is less than 44% by mass, the mechanical properties may be reduced. On the other hand, if the content of (a) acid-reactive glass powder is more than 80% by mass, the working time may be significantly shortened or the viscosity of the mixed product may increase, resulting in poor mixing properties, which may adversely affect the workability.

[0037] <(b) Polyalkenoic acid> The (b) polyalkenoic acid that can be used in the dental glass ionomer cement composition of the present invention is a component that contributes to the curing properties of the composition. The (b) polyalkenoic acid can be any homopolymer or copolymer of an ethylenically unsaturated monomer having at least one carboxy group in the molecule, such as an ethylenically unsaturated monocarboxylic acid, an ethylenically unsaturated dicarboxylic acid, or an ethylenically unsaturated tricarboxylic acid. Furthermore, the (b) polyalkenoic acid may be a copolymer of an ethylenically unsaturated monomer that does not have a carboxy group in the molecule and an ethylenically unsaturated monomer that has a carboxy group. Even in such a copolymer, the ethylenically unsaturated monomer unit having a carboxy group preferably accounts for 60% or more, more preferably 70% or more, and most preferably 80% or more.

[0038] Specific examples of ethylenically unsaturated monomers having a carboxy group that can be used to obtain (b) polyalkenoic acids include, but are not limited to, ethylenically unsaturated monocarboxylic acids such as acrylic acid, methacrylic acid, 2-chloroacrylic acid, 3-chloroacrylic acid, and 2-cyanoacrylic acid, ethylenically unsaturated dicarboxylic acids such as mesaconic acid, maleic acid, maleic anhydride, itaconic acid, itaconic anhydride, fumaric acid, glutaconic acid, and citraconic acid, and ethylenically unsaturated tricarboxylic acids such as aconitic acid, 1-butene-1,2,4-tricarboxylic acid, and 3-butene-1,2,3-tricarboxylic acid. Among these, it is preferable to use (b) polyalkenoic acids synthesized using only acrylic acid as a starting material, or (b) polyalkenoic acids synthesized using two or more starting materials, such as acrylic acid and maleic acid, acrylic acid and maleic anhydride, acrylic acid and itaconic acid, or acrylic acid and 3-butene-1,2,3-tricarboxylic acid.

[0039] The polymerization method used to obtain various (b) polyalkenoic acids is not particularly limited, and any polymerization method such as solution polymerization, suspension polymerization, or emulsion polymerization can be used without any restrictions. Furthermore, known polymerization initiators and chain transfer agents can be used during polymerization, and the amounts added can be adjusted appropriately depending on the desired properties. The (b) polyalkenoic acids obtained in this manner can be used alone or in combination.

[0040] The weight-average molecular weight of the (b) polyalkenoic acid is preferably 30,000 or more and 300,000 or less. Here, the weight-average molecular weight is the average molecular weight calculated based on the molecular weight distribution measured by gel permeation chromatography. If the weight-average molecular weight of the (b) polyalkenoic acid is less than 30,000, the mechanical properties may be reduced. On the other hand, if the weight-average molecular weight of the (b) polyalkenoic acid is more than 300,000, the working time may be significantly shortened, or the viscosity of the kneaded product may increase, resulting in poor kneading properties, which may adversely affect workability. The dental glass ionomer cement composition of the present invention may also contain only polyalkenoic acids with a weight-average molecular weight of 30,000 or more and 300,000 or less as the (b) polyalkenoic acid.

[0041] Furthermore, (b) polyalkenoic acid can be used after neutralizing some of its carboxyl groups with a basic compound to adjust the acid-base reactivity with (a) acid-reactive glass powder, as long as the neutralization does not adversely affect various properties. Examples of basic compounds used for neutralization include alkali metal hydroxides such as sodium hydroxide, potassium hydroxide, and lithium hydroxide; alkali metal carbonates such as sodium carbonate, potassium carbonate, and lithium carbonate; and alkali metal bicarbonates such as sodium bicarbonate, potassium bicarbonate, and lithium bicarbonate. Various amine compounds, such as primary amines, secondary amines, and tertiary amines, can also be used without any problems. Suitable amine compounds include triethanolamine, diethanolamine, N-methyldiethanolamine, and 2-dimethylaminoethyl (meth)acrylate.

[0042] The (b) polyalkenoic acid is preferably contained in an amount of 7.5% by mass to 20% by mass, more preferably 10% by mass to 14% by mass, based on the total amount of the dental glass ionomer cement composition of the present invention. If the (b) polyalkenoic acid content is less than 7.5% by mass, the mechanical properties may be reduced. If the (b) polyalkenoic acid content exceeds 20% by mass, the working time may be significantly shortened, or the viscosity of the kneaded product may increase, resulting in poor kneading properties, which may adversely affect operability.

[0043] <(c)Water> (c) Water, which can be used in the dental glass ionomer cement composition of the present invention, functions as a solvent for dissolving (b) polyalkenoic acid, and also serves as a component for diffusing metal ions eluted from (a) the acid-reactive glass powder and inducing a crosslinking reaction between (b) polyalkenoic acids.

[0044] (c) Water may be used without any restrictions as long as it does not contain impurities that inhibit the acid-base reaction in the dental glass ionomer cement composition of the present invention or that adversely affect the hardening properties or mechanical properties. However, it is preferable to use distilled water or ion-exchanged water.

[0045] The content of (c) water is preferably 7% by mass or more and 32% by mass or less, and more preferably 12% by mass or more and 16% by mass or less, of the total dental glass ionomer cement composition of the present invention. If the content of (c) water is less than 7% by mass, it may have adverse effects on operability, such as a significant shortening of working time or an increase in the viscosity of the kneaded product, resulting in poor kneading. Furthermore, if the content of (c) water exceeds 32% by mass, it may result in a decrease in mechanical properties.

[0046] <(d) Porous inorganic filler> The (d) porous inorganic filler that can be used in the dental glass ionomer cement composition of the present invention is an inorganic filler having at least one pore. The presence or absence of pores in the inorganic filler can be measured, for example, by gas adsorption or mercury intrusion porosimetry. More specifically, in this specification, the (d) porous inorganic filler refers to one having a pore volume of 0.01 cc / g or more as measured by gas adsorption. The dental glass ionomer cement composition of the present invention may not contain any filler other than the (d) porous inorganic filler.

[0047] The shape of the (d) porous inorganic filler is not particularly limited, but is preferably spherical or crushed, since this has relatively little effect on the viscosity of the kneaded product in the dental glass ionomer cement composition of the present invention. The 50% particle size (D50) of the (d) porous inorganic filler is preferably 0.1 μm or more and 10 μm or less, and more preferably 1 μm or more and 8 μm or less. If the 50% particle size (D50) of the (d) porous inorganic filler exceeds 10 μm, the mechanical properties of the dental glass ionomer cement composition of the present invention may be reduced. If the 50% particle size (D50) is less than 0.1 μm, this may adversely affect the kneading properties and kneaded product properties.

[0048] The pore volume of the (d) porous inorganic filler is preferably 0.01 cc / g or more and 1.00 cc / g or less, and more preferably 0.10 cc / g or more and 0.80 cc / g or less. The specific surface area of ​​the (d) porous inorganic filler is preferably 5 m 2 / g or more 500m 2 / g or less, and 2 / g or more 300m 2 / g or less. (d) Porous inorganic filler having such properties can effectively reduce stringiness of the kneaded product in the dental glass ionomer cement composition of the present invention. If the pore volume and / or specific surface area of ​​the (d) porous inorganic filler is less than the above range, the effect of reducing stringiness of the kneaded product may be difficult to achieve. If the pore volume and / or specific surface area exceeds the above range, the mechanical properties may be reduced. Note that the dental glass ionomer cement composition of the present invention contains (d) porous inorganic filler having a 50% particle size (D50) of 0.1 μm or more and 10 μm or less, a pore volume of 0.01 cc / g or more and 1.00 cc / g or less, and a specific surface area of ​​5 m 2 / g or more 500m 2 It is also possible to include only a porous inorganic filler of 0.1g or less.

[0049] (d) The porous inorganic filler has inorganic particles at its core that are composed solely of silicon dioxide or of silicon dioxide and an oxide containing one or more metal elements. Examples of oxides containing metal elements include, but are not limited to, oxides of metal elements such as Al, Ba, Bi, Ca, Ce, Co, Cu, Er, Fe, Hf, Ho, In, La, Mg, Mn, Nd, Ni, Pb, Sb, Sn, Sr, Ta, Ti, Y, Yb, Zn, and Zr. Among these, oxides of Al, Ba, Ca, Co, Cu, Fe, Hf, La, Mg, Ni, Sr, Ti, Zn, and Zr are preferred, oxides of Ba, Ti, Zr, etc. are more preferred, and oxide of Zr is even more preferred. The dental glass ionomer cement composition of the present invention may contain only oxides of Al, Ba, Ca, Co, Cu, Fe, Hf, La, Mg, Ni, Sr, Ti, Zn, or Zr as oxides containing metal elements constituting the inorganic particles at the center of the (d) porous inorganic filler, or may contain only oxides of Ba, Ti, or Zr, or may contain only oxide of Zr.

[0050] The oxide content of the metal element contained in the inorganic particles at the center of the (d) porous inorganic filler is preferably 30% by mass or less in terms of oxide content. If the oxide content of the metal element exceeds 30% by mass, the refractive index of the (d) porous inorganic filler becomes too high, which may cause the dental glass ionomer cement composition of the present invention to become opaque.

[0051] The inorganic particles at the center of the (d) porous inorganic filler can be produced, for example, by mixing an acidic silicic acid liquid, a silicon dioxide sol, and optionally one or more aqueous metal salt solutions, spray-drying the mixed slurry, and then heat-treating the resulting dried particles.Details of the production method for the (d) porous inorganic filler are disclosed in, for example, JP 2019-189637 A, but are not limited to these production methods.

[0052] Furthermore, in order to adjust the fluidity of the powder material in the dental glass ionomer cement composition of the present invention and the properties of the paste, the (d) porous inorganic filler can optionally be surface-treated with a silane compound such as (meth)acryloyloxymethyltrimethoxysilane, 3-(meth)acryloyloxypropyltrimethoxysilane, 8-(meth)acryloyloxyoctyltrimethoxysilane, 3-mercaptopropyltrimethoxysilane, 3-aminopropyltrimethoxysilane, or 3-glycidoxypropyltrimethoxysilane. Surface treatment agents are not limited to those listed above, and these surface treatment agents can be used alone or in combination. Furthermore, the amount of surface treatment agent relative to the inorganic particles at the center of the (d) porous inorganic filler is not particularly limited; it can be adjusted appropriately depending on the particle size, pore volume, specific surface area, and desired properties of the inorganic particles at the center of the (d) porous inorganic filler.

[0053] The (d) porous inorganic filler must be contained in an amount of 0.075% by mass to 15% by mass, and more preferably 3% by mass to 8% by mass, based on the total amount of the dental glass ionomer cement composition of the present invention. If the (d) porous inorganic filler content is less than 0.075% by mass, the effect of reducing stringiness of the kneaded product will not be achieved. On the other hand, if the content exceeds 15% by mass, the mechanical properties will be reduced and the viscosity of the kneaded product will increase, resulting in poor kneadability.

[0054] <Other ingredients> The dental glass ionomer cement composition of the present invention can optionally contain an acidic compound to adjust the working time and setting time, as long as the acidic compound does not adversely affect various properties. Specific examples of acidic compounds include, but are not limited to, carboxylic acid compounds such as tartaric acid, citric acid, maleic acid, fumaric acid, malic acid, aconitic acid, tricarballylic acid, itaconic acid, 1-butene-1,2,4-tricarboxylic acid, and 3-butene-1,2,3-tricarboxylic acid; phosphate compounds such as phosphoric acid, pyrophosphoric acid, and tripolyphosphoric acid; and metal salts of these acidic compounds. These acidic compounds can be used alone or in combination. When an acidic compound is contained in the dental glass ionomer cement composition of the present invention, the acidic compound is preferably present in an amount of 0.1% by weight to 15% by weight of the total composition. The dental glass ionomer cement composition of the present invention may also be free of acidic compounds.

[0055] Furthermore, the dental glass ionomer cement composition of the present invention may optionally contain a surfactant to adjust the initial compatibility and kneaded properties of the powder material and liquid material, or the first paste and second paste, etc., so long as the surfactant does not adversely affect various properties. The surfactant that can be used in the dental glass ionomer cement composition of the present invention may be either an ionic surfactant or a nonionic surfactant.

[0056] Specific examples of ionic surfactants include anionic surfactants such as metal salts of aliphatic carboxylic acids (e.g., sodium stearate), sulfated metal salts of aliphatic carboxylic acids (e.g., sodium dioctyl sulfosuccinate), and metal salts of higher alcohol sulfates (e.g., sodium stearyl sulfate). Cationic surfactants include adducts of higher alkylamines and ethylene oxide, amines prepared from lower amines, and alkyltrimethylammonium salts (e.g., lauryltrimethylammonium chloride). Amphoteric surfactants include metal salts of higher alkylaminopropionic acids (e.g., sodium stearylaminopropionate), and betaines (e.g., lauryldimethylbetaine).

[0057] Examples of nonionic surfactants include polyethylene glycol-type surfactants or polypropylene glycol-type surfactants in which ethylene oxide or propylene oxide is added to higher alcohols, alkylphenols, fatty acids, higher aliphatic amines, aliphatic amides, etc., and polyhydric alcohol-type surfactants in which polyhydric alcohols, diethanolamines, sugars, and fatty acids are ester-bonded.

[0058] The surfactants listed above are not limited to these, and may be used alone or in combination. When a surfactant is contained in the dental glass ionomer cement composition of the present invention, the surfactant is preferably contained in an amount of 0.001% by mass or more and 5% by mass or less based on the total mass of the composition. The dental glass ionomer cement composition of the present invention may also be free of a surfactant.

[0059] Furthermore, the dental glass ionomer cement composition of the present invention may optionally contain a non-porous, non-acid-reactive powder for the purpose of adjusting the handling properties, mechanical properties, or hardening properties, as long as the powder does not adversely affect the various properties.

[0060] The non-acid-reactive powder having no pores that can be used in the dental glass ionomer cement composition of the present invention is not particularly limited as long as it does not contain an element that reacts with the acidic group of (b) the polyalkenoic acid. Examples of non-acid-reactive powders having no pores include those known in the dental field, such as inorganic fillers, organic fillers, and organic-inorganic composite fillers, which can be used alone or in combination. Among these, inorganic fillers are particularly preferred. Furthermore, the shape of these non-acid-reactive powders having no pores is not particularly limited, and they may be spherical, acicular, plate-like, crushed, scale-like, or any other shape. The 50% particle size (D50) of these non-acid-reactive powders is not particularly limited, but is preferably 0.001 μm or more and 30 μm or less.

[0061] Specific examples of non-porous inorganic fillers include, but are not limited to, quartz, amorphous silica, ultrafine silica particles, various glasses that do not contain elements that react with acidic groups (including glasses produced by melting methods, synthetic glasses by the sol-gel method, glasses produced by gas-phase reactions, etc.), silicon nitride, silicon carbide, boron carbide, etc. Furthermore, these non-porous inorganic fillers can be used alone or in combination.

[0062] When the dental glass ionomer cement composition of the present invention contains a non-acid-reactive powder having no pores, the content of the non-acid-reactive powder is preferably 0.001% by mass or more and 20% by mass or less of the total composition. However, the dental glass ionomer cement composition of the present invention may not contain the non-acid-reactive powder having no pores.

[0063] Furthermore, when the dental glass ionomer cement composition of the present invention is in a paste form, a thickener can be optionally added to adjust the paste properties within a range that does not adversely affect various properties.

[0064] The thickener that can be used in the dental glass ionomer cement composition of the present invention may be either an inorganic thickener or an organic thickener, such as fumed silica, calcium carbonate, calcium silicate, magnesium silicate, or clay minerals such as saponite, montmorillonite, beidellite, vermiculite, sauconite, stevensite, hectorite, smectite, tietite, and sepiolite.

[0065] Examples of organic thickeners include methyl cellulose, hydroxyethyl cellulose, hydroxymethyl cellulose, hydroxypropyl cellulose, carboxymethyl cellulose, sodium carboxymethyl cellulose, calcium carboxymethyl cellulose, carboxypolymethylene, sodium alginate, propylene glycol alginate, sodium polyacrylate, starch, sodium starch glycolate, starch phosphate ester, polyvinylpyrrolidone, carboxyvinyl polymer, khaya gum, gum arabic, karaya gum, guar gum, and xanthan gum.

[0066] The thickeners listed above are not limited to these, and may be used alone or in combination. When a thickener is contained in the dental glass ionomer cement composition of the present invention, the thickener is preferably contained in an amount of 0.001% by mass to 10% by mass in the paste. However, the dental glass ionomer cement composition of the present invention may not contain a thickener.

[0067] Furthermore, the dental glass ionomer cement composition of the present invention may optionally contain preservatives, antibacterial agents, colorants, fluorescent agents, inorganic fiber materials, organic fiber materials, and other conventionally known additives, as needed.

[0068] The dental glass ionomer cement composition of the present invention can be provided in various forms, such as powder / liquid, paste / paste, paste / powder, or paste / liquid, as long as (a) the acid-reactive glass powder and (b) the polyalkenoic acid do not coexist in the presence of (c) water.

[0069] The dental glass ionomer cement composition of the present invention preferably shortens the treatment time by shortening the time until shaping can begin, for example, by adjusting the amounts of the above-described components. To shorten treatment time, the time until shaping can begin is preferably within 30 seconds, and more preferably within 20 seconds.

[0070] The dental glass ionomer cement composition of the present invention can be used for a wide range of purposes in dental treatment, such as as a filling material and a bonding material, as well as a pit and fissure sealant, a lining material, and a core construction material. [Example]

[0071] The present invention will be specifically described below with reference to examples and comparative examples, but the present invention is not limited to these examples. Components (a) to (d) and other components used to prepare the dental glass ionomer cement compositions of the examples and comparative examples, as well as their abbreviations and production methods, are as follows:

[0072] [(a) Acid-reactive glass powder] G1: Acid-reactive glass powder 1 (G1) (fluoroaluminosilicate glass powder, 50% particle size (D50): 2.5 μm) G2: Acid-reactive glass powder 2 (G2) (fluoroaluminosilicate glass powder, 50% particle size (D50): 20 μm) G3: Acid-reactive glass powder 3 (G3) (fluoroaluminosilicate glass powder, 50% particle size (D50): 25 μm)

[0073] [(b) Polyalkenoic acid] PCA1: Acrylic acid-tricarboxylic acid copolymer powder (weight average molecular weight: 80,000) PCA2: Acrylic acid-tricarboxylic acid copolymer powder (weight average molecular weight: 140,000) PCA3: Acrylic acid homopolymer powder (weight average molecular weight: 50,000) PCA4: Acrylic acid homopolymer powder (weight average molecular weight: 300,000) PCA5: Acrylic acid homopolymer powder (weight average molecular weight: 10,000) PCA6: Acrylic acid homopolymer powder (weight average molecular weight: 350,000)

[0074] [(c)Water] ·IEW: Ion-exchanged water

[0075] [(d) Porous inorganic filler] PIF1: Porous inorganic filler (SiO2: 80% by mass, ZrO: 20% by mass, 50% particle size (D50): 2.0 μm, pore volume: 0.08 cc / g, specific surface area: 15 m 2 / g) PIF2: Porous inorganic filler (SiO2: 80% by mass, ZrO: 20% by mass, 50% particle size (D50): 3.0 μm, pore volume: 0.20 cc / g, specific surface area: 135 m 2 / g) PIF3: Porous inorganic filler (SiO2: 80% by mass, ZrO: 20% by mass, 50% particle size (D50): 4.0 μm, pore volume: 0.30 cc / g, specific surface area: 200 m 2 / g) PIF4: Porous inorganic filler (SiO2: 100% by mass, 50% particle size (D50): 9.0 μm, pore volume: 0.80 cc / g, specific surface area: 200 m 2 / g) PIF5: Surface-treated porous inorganic filler (SiO2: 80% by mass, ZrO: 20% by mass, 50% particle size (D50): 3.0 μm, pore volume: 0.19 cc / g, specific surface area: 133 m 2 / g) PIF6: Porous inorganic filler (SiO2: 94% by mass, TiO2: 6% by mass, 50% particle size (D50): 2.9 μm, pore volume: 0.21 cc / g, specific surface area: 173 m 2 / g) PIF7: Porous inorganic filler (SiO2: 70% by mass, ZrO: 30% by mass, 50% particle size (D50): 2.9 μm, pore volume: 0.19 cc / g, specific surface area: 161 m 2 / g) PIF8: Porous inorganic filler (SiO2: 65% by mass, ZrO: 35% by mass, 50% particle size (D50): 2.9 μm, pore volume: 0.17 cc / g, specific surface area: 149 m 2 / g)

[0076] [Other ingredients] Fuselex X: Crushed silica filler (non-acid-reactive powder with no pores, 50% particle size (D50): 3.0 μm, pore volume: less than 0.01 cc / g) Aerosil R972: Spherical silica filler (thickener, primary particle size 16 nm, Pore ​​volume: less than 0.01 cc / g ·TA: Tartaric acid

[0077] [(a) Preparation of Acid-Reactive Glass Powder] [Production of Acid-Reactive Glass Powder 1 (G1)] Various raw materials, including silica, alumina, aluminum phosphate, sodium fluoride, and strontium carbonate (glass composition: 26.4% by mass of SiO, 29.3% by mass of AlO, 20.5% by mass of SrO, 10.9% by mass of PO, 2.5% by mass of NaO, and 10.4% by mass of F), were mixed and then melted in a melting furnace at 1400°C. The melt was removed from the furnace and quenched in water to obtain fluoroaluminosilicate glass. The obtained fluoroaluminosilicate glass was pulverized to a 50% particle size (D50) of 2.5 μm to obtain acid-reactive glass powder 1 (G1). The 50% particle size (D50) was measured using a laser diffraction particle size analyzer (Microtrac MT3300EXII, manufactured by Microtrac Bell).

[0078] [Production of Acid-Reactive Glass Powder 2 (G2)] The acid-reactive glass powder was prepared in the same manner as in the acid-reactive glass powder 1, except that the 50% particle size was adjusted to 20 μm by adjusting the grinding time. [Production of Acid-Reactive Glass Powder 3 (G3)] The acid-reactive glass powder was prepared in the same manner as in the acid-reactive glass powder 1, except that the 50% particle size was adjusted to 25 μm by adjusting the grinding time.

[0079] [Production of surface-treated porous inorganic filler (PIF5)] A surface treatment solution (total mass: 9.2 parts by mass) was prepared by mixing 0.3 parts by mass of γ-methacryloyloxypropyltrimethoxysilane, 0.1 parts by mass of ion-exchanged water, and 8.8 parts by mass of absolute ethanol. This surface treatment solution was dry-mixed with 100 parts by mass of porous inorganic filler (PIF2), and then heat-treated at 110°C for 5 hours using a hot air dryer to obtain surface-treated porous inorganic filler (PIF5).

[0080] [Preparation of powder and liquid materials, or first and second pastes] The various components were mixed in the proportions shown in Tables 1 to 5 to prepare a powder material, a liquid material, a first paste, and a second paste.

[0081] Composition (mass%) of powder materials used in Examples and Comparative Examples [Table 1]

[0082] Composition (mass%) of powder materials used in Examples and Comparative Examples [Table 2]

[0083] Composition (mass%) of the liquid materials used in the examples and comparative examples [Table 3]

[0084] Composition (mass%) of the first paste used in the examples and comparative examples [Table 4]

[0085] Composition (mass%) of the second paste used in the examples and comparative examples [Table 5]

[0086] [Dental glass ionomer cement composition] Dental glass ionomer cement compositions for filling or luting (Examples 1 to 33, Comparative Examples 1 to 7) were prepared by combining the powder and liquid materials, or the first and second pastes, at the powder-liquid ratios or paste ratios (mass ratios) shown in Tables 6 to 9. The kneading properties, stringiness of the kneaded mixture, time to start shaping, and compressive strength were evaluated. For filling compositions (Examples 1 to 16, 20, 22 to 25, 27 to 32) and Comparative Examples 1 and 3 to 6, all of the above test items were evaluated. For luting compositions (Examples 17 to 19, 21, 26, 33) and Comparative Examples 2 and 7, all of the above test items except for time to start shaping were evaluated. The evaluation methods are as follows:

[0087] [Mixability] In an environment of a temperature of 23±1°C and a humidity of 50±10%, the powder and liquid materials, or the first and second pastes, of the dental glass ionomer cement compositions of the Examples or Comparative Examples were mixed using a plastic spatula in the proportions shown in Tables 6 to 9. The time from the start of mixing was used as the base point, and the time until no remaining powder material was visually detected in the mixed mixture and the mixed mixture became homogeneous was measured. The total amount of the powder and liquid materials, or the first and second pastes, was 360 mg. When evaluated according to the following evaluation criteria, a rating of A or B was determined to indicate good mixability. Three evaluators each performed three measurements, and the average of the measurement results was evaluated according to the following evaluation criteria to determine the evaluation result for the measurement object. -Evaluation criteria- [Powder-liquid type] A: The time required for the kneaded material to become uniform is less than 30 seconds. B: The time required for the kneaded material to become uniform is 30 seconds or more and less than 50 seconds. C: The time required for the kneaded material to become uniform is 50 seconds or more, or the kneaded material is not uniform. [Paste type] A: The time required for the kneaded material to become uniform is less than 10 seconds. B: The time required for the kneaded material to become uniform is 10 seconds or more and less than 20 seconds. C: The time required for the kneaded material to become uniform is 20 seconds or more.

[0088] [Stringiness of the kneaded product] The powder and liquid materials, or the first and second pastes, of the dental glass ionomer cement compositions of the Examples and Comparative Examples were mixed using a plastic spatula in the proportions shown in Tables 6 to 9 under an environment of 23±1°C and 50±10% humidity. The total amount of powder and liquid materials, or the first and second pastes, was 360 mg. Immediately after mixing, the mixture was filled into a plastic simulated cavity (a 4mm x 8mm x 2mm cavity simulating a Class I cavity), and the excess material was scraped off to create a flat surface. Ten seconds after mixing, the cylindrical tip (1.5mm diameter) of a metal instrument (MiCD Instrument, manufactured by Matsukaze) was vertically immersed 0.5mm into the mixture, and the instrument was immediately gently withdrawn. The degree of stringiness of the mixture was evaluated according to the following criteria. A rating of A or B was considered to indicate minimal stringiness and good mixed properties. The evaluation was carried out by three evaluators, each performing three evaluations, and the most frequently evaluated result was taken as the evaluation result for the measurement object. -Evaluation criteria- A: It doesn't string. B: Slight stringiness. C: Significant stringiness.

[0089] [Possible time to start shaping] The powder and liquid materials, or the first and second pastes, of the dental glass ionomer cement compositions of the Examples and Comparative Examples were mixed using a plastic spatula in the proportions shown in Tables 6 to 9 under an environment of 23±1°C and 50±10% humidity. The total amount of powder and liquid materials, or the first and second pastes, was 360 mg. Immediately after mixing, the mixture was filled into a plastic simulated cavity (a 4mm x 8mm x 2mm cavity simulating a Class I cavity), and the excess material was scraped off to create a flat surface. The tip of an instrument (MiCD Instrument, manufactured by Matsukaze) (diameter φ1.5mm) was vertically immersed 0.5 mm into the mixture, and the instrument was immediately gently withdrawn. The time until the stringiness of the mixture decreased and it became ready for shaping was measured at 10-second intervals, starting from the end of mixing. When evaluated according to the following evaluation criteria, if the result was A or B, it was determined that the product had an early time to start forming. The evaluation was carried out by three evaluators, who each performed three evaluations, and the average of the measurement results was evaluated based on the following evaluation criteria to determine the evaluation result of the measurement subject. -Evaluation criteria- A: 20 seconds after mixing is complete, the stringiness of the mixed material is reduced and shaping operations are possible. B: 30 seconds after mixing, the stringiness of the mixed material has decreased and it is now possible to perform shaping operations. C: After mixing, the stringiness of the mixed material is reduced and shaping is possible after 40 seconds or more.

[0090] [Compression strength] Compressive strength was measured according to ISO 9917-1:2007 using the following procedure. The powder and liquid materials, or the first and second pastes, of the dental glass ionomer cement compositions of the Examples and Comparative Examples were mixed using a plastic spatula in the proportions shown in Tables 6 to 9 under an environment of 23±1°C and 50±10% humidity. The mixed mixture was filled into a stainless steel mold (cylindrical, inner diameter: 4 mm, height: 6 mm) and then placed in a thermo-hygrostat chamber at 37°C and a humidity of 90% or higher. After standing for 1 hour, the hardened product was removed from the mold and used as a test specimen. The test specimen was immersed in 37°C ion-exchanged water for 24 hours after mixing, and then the compressive strength of the test specimen was measured using an Instron universal testing machine (model: 5567A) at a crosshead speed of 1 mm / min. Evaluation was based on the following criteria: A grade of A or B was considered to indicate good mechanical properties. The evaluation was carried out by performing five measurements for each test piece, and the average of the measurement results was evaluated based on the following evaluation criteria to obtain the evaluation result for the test piece. -Evaluation criteria- Filling Composition A: Compressive strength is 220 MPa or more. B: Compressive strength is 200 MPa or more and less than 220 MPa. C: The compressive strength is less than 200 MPa. [Composition for cementing] A: Compressive strength is 160 MPa or more B: Compressive strength is 140 MPa or more and less than 160 MPa. C: Compressive strength is less than 140 MPa.

[0091] The compositions of the Examples and Comparative Examples were evaluated according to the above test methods, and the results are shown in Tables 6 to 9.

[0092] Evaluation results of Examples 1 to 11 [Table 6]

[0093] Evaluation results of Examples 12 to 22 [Table 7]

[0094] Evaluation results of Examples 23 to 33 [Table 8]

[0095] Evaluation results of Comparative Examples 1 to 7 [Table 9]

[0096] <Examples 1 to 16, 20, 22 to 25, 27 to 32> Examples 1 to 16, 20, 22 to 25, and 27 to 32 showed little stringiness immediately after mixing, and shaping operations could be performed soon after filling into the simulated cavity. Furthermore, they also exhibited good mixing and mechanical properties, and had properties desirable for dental glass ionomer cement compositions for filling.

[0097] <Examples 17 to 19, 21, 26, and 33> Examples 17 to 19, 21, 26, and 33 showed little stringiness immediately after mixing. Furthermore, they also exhibited good mixing properties and mechanical properties, and had properties desirable for a dental glass ionomer cement composition for luting.

[0098] <Comparative Example 1> The dental glass ionomer cement composition for filling of Comparative Example 1 did not contain (d) porous inorganic filler. Evaluation of Comparative Example 1 revealed that significant stringiness occurred immediately after mixing, and it took a long time before shaping operations became possible. <Comparative Example 2> The dental glass ionomer cement composition for luting of Comparative Example 2 did not contain (d) porous inorganic filler. As a result of evaluating Comparative Example 2, significant stringiness was observed immediately after mixing. <Comparative Example 3> The dental glass ionomer cement composition for filling of Comparative Example 3 had a high content of (d) porous inorganic filler. As a result of evaluation of Comparative Example 3, the compressive strength was low. <Comparative Example 4> The dental glass ionomer cement composition for filling of Comparative Example 4 had a low content of (d) porous inorganic filler. As a result of evaluating Comparative Example 4, significant stringiness was observed immediately after mixing, and it took a long time before shaping operations became possible. <Comparative Example 5> The dental glass ionomer cement composition for filling of Comparative Example 5 contained a non-acid-reactive powder without pores instead of the porous inorganic filler (d). As a result of evaluating Comparative Example 5, significant stringiness was observed immediately after mixing, and it took a long time before shaping operations became possible. <Comparative Example 6> The dental glass ionomer cement composition for filling of Comparative Example 6 did not contain (d) porous inorganic filler. As a result of evaluating Comparative Example 6, significant stringiness was observed immediately after mixing, and it took a long time before shaping operations became possible. <Comparative Example 7> The dental glass ionomer cement composition for luting of Comparative Example 7 did not contain (d) porous inorganic filler. As a result of evaluating Comparative Example 7, significant stringiness was observed immediately after mixing. [Industrial Applicability]

[0099] The dental glass ionomer cement composition of the present invention can be suitably used in dental treatments such as filling dental cavities, lining layers or relinings, bonding dental prosthetic devices such as crowns, inlays and bridges to tooth structures, sealing pits and fissures, preventive coating of tooth surfaces, and core construction.

Claims

1. (a) an acid-reactive glass powder; (b) polyalkenoic acid; (c) water, and (d) porous inorganic filler: 0.075% by mass or more and 15% by mass or less; A dental glass ionomer cement composition comprising: A dental glass ionomer cement composition, characterized in that the center of the (d) porous inorganic filler is an inorganic particle composed only of silicon dioxide, or composed of silicon dioxide and an oxide containing one or more metal elements.

2. The porous inorganic filler (d) has a 50% particle diameter (D50) in the range of 0.1 μm to 10 μm, a pore volume of 0.01 cc / g to 1.00 cc / g, and a specific surface area of ​​5 m ２ / g or more 500m ２ 2. The dental glass ionomer cement composition according to claim 1, wherein the viscosity of the dental glass ionomer cement composition is in the range of 0.15 to 1.0 g / g or less.

3. the (a) acid-reactive glass powder is 44% by mass or more and 80% by mass or less; (b) 7.5% by mass or more and 20% by mass or less of the polyalkenoic acid; (c) Water 7% by mass or more and 32% by mass or less, and (d) the porous inorganic filler: 0.075% by mass or more and 15% by mass or less; 3. The dental glass ionomer cement composition according to claim 1, comprising:

4. 3. The dental glass ionomer cement composition according to claim 1, wherein the time required for starting shaping of the dental glass ionomer cement composition is within 30 seconds.

5. 4. The dental glass ionomer cement composition according to claim 3, wherein the time required for starting shaping of the dental glass ionomer cement composition is within 30 seconds.

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