Dental glass ionomer cement composition

Abstract

Provided is a dental glass ionomer cement composition which has little wiredrawing in a kneaded product, is in a state in which a shaping operation can be performed at an initial stage from the end of kneading, has excellent filling properties into a cavity or coating properties to a dental repair device, and also has good kneading properties and mechanical properties. A dental glass ionomer cement composition comprising (a) an acid-reactive glass powder, (b) a polyolefin acid, (c) water, and (d) 0.075-15 mass% of a porous inorganic filler, characterized in that: the central part of the (d) porous inorganic filler is inorganic particles comprising only silica; or inorganic particles comprising silica and an oxide containing one or more metal elements.

Description

Technical Field

[0001] The present invention relates to a dental glass ionomer cement composition, which is used for filling and repairing teeth partially damaged in shape due to caries or breakage, or for bonding or adhering a dental prosthetic device to a tooth with damaged shape. Background Art

[0002] In dental practice, to restore the aesthetics and functionality of teeth that have been partially damaged due to decay or breakage, direct restorations are performed by filling the tooth with a filling material, or indirect restorations are performed by adhering and / or bonding a dental prosthesis to the tooth using an adhesive. Dental glass ionomer cement is a representative example of a filling material or adhesive. Its greatest feature is its ability to sustainably release fluoride ions, which strengthens tooth texture and inhibits secondary caries.

[0003] Dental glass ionomer cement is mainly composed of acid-reactive glass powder represented by fluoroaluminosilicate glass powder, polyolefinic acid and water, and is mainly composed of two-component forms such as powder-liquid type or double paste type. These dental glass ionomer cements in each form are kneaded by hand or mechanical kneading in the powder-liquid type, and by hand kneading or automatic kneading using a mixing chip in the double paste type just before use. In the dental glass ionomer cement kneaded in this way, acidic compounds such as polyolefinic acid act on the acid-reactive glass powder in the presence of water, dissolving polyvalent metal ions (Al2O3) from the acid-reactive glass powder. 3+ , Ca 2+ 、Sr 2+ The dissolved polyvalent metal ions and the acidic groups of the polyolefinic acid form ionic bonds (acid-base reaction), thereby forming a cross-linked structure between the polyolefinic acids via the polyvalent metal ions and solidifying.

[0004] Various technologies have been proposed to improve various properties by adding additives to the main components of dental glass ionomer cement. For example, Japanese Patent Application Laid-Open No. 2019-137618 discloses a technology for improving the transparency of a cured dental glass ionomer cement composition by adding a polyvalent metal compound.

[0005] Furthermore, Japanese Patent Application Laid-Open No. 2023-9286 discloses a technique for improving mechanical properties by adding a water reducing agent to a dental glass ionomer cement composition. Summary of the Invention

[0006] Because dental glass ionomer cement contains a high-viscosity polyolefin acid aqueous solution in its composition, the kneaded product immediately after kneading tends to be easily drawn. This drawing can sometimes have an adverse effect on operability during filling or adhesion, and is particularly susceptible to its influence during filling operations. For example, after the kneaded product is filled into a cavity using a dental appliance such as an instrument or a dental syringe, when the dental appliance is removed from the kneaded product, if the kneaded product draws, the kneaded product may adhere to the surrounding dentin or oral mucosa. In this case, it is necessary to carefully remove the attachments, and the operation becomes complicated.

[0007] Furthermore, since dental glass ionomer cement begins to cure through the acid-base reaction immediately after kneading, regardless of the properties of the kneaded material, stringiness in the kneaded material decreases over time, making shaping easier. Therefore, when shaping the kneaded material to be filled into a cavity, shaping should be performed only after stringiness has decreased. On the other hand, if stringiness is significant and further reduction is required, treatment time will be prolonged and the risk of saliva contamination of the treated area will increase.

[0008] As a method for reducing stringiness of the kneaded product immediately after kneading, a method of increasing the proportion of acid-reactive glass powder contained in the dental glass ionomer cement or a method of increasing the particle size can be cited. However, if the proportion of acid-reactive glass powder is increased, the viscosity of the kneaded product increases, and thus the kneading property may decrease. In addition, if the particle size of the acid-reactive glass powder is increased, the acid-base reactivity of the acid-reactive glass powder and the polyolefinic acid decreases, which may cause 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 having less stringiness of a kneaded product than in the prior art, excellent filling properties into a cavity or coating properties onto a dental prosthetic device, and a state in which shaping operation can be performed in the early stage after kneading, and excellent kneadability and mechanical properties.

[0010] The present inventors have conducted intensive studies to address the above-mentioned problems and, as a result, have discovered that by incorporating a specific porous inorganic filler within a specific range into a dental glass ionomer cement composition, the kneaded product exhibits minimal stringing, excellent cavity filling properties, and excellent coating properties onto dental prosthetic devices. Furthermore, the kneaded product is capable of initial shaping after kneading is completed, and exhibits good kneadability and excellent mechanical properties. This has led to the completion of the present invention.

[0011] That is, the above-mentioned problems can be solved by setting it as the following component configuration.

[0012] A dental glass ionomer cement composition comprising (a) acid-reactive glass powder, (b) polyolefinic acid, (c) water, and (d) 0.075% by mass or more and 15% by mass or less of a porous inorganic filler, wherein the central portion of the porous inorganic filler (d) is an inorganic particle composed solely of silicon dioxide, or an inorganic particle composed of silicon dioxide and an oxide of one or more metal elements.

[0013] According to the present invention, a dental glass ionomer cement composition can be provided which exhibits little stringing immediately after kneading, thereby exhibiting excellent cavity filling properties and coating properties on dental prosthetic devices. Furthermore, the composition is in a state where shaping operation can be performed in the early stages after kneading, thereby shortening the treatment time. The composition also exhibits excellent kneading properties and mechanical properties. DETAILED DESCRIPTION

[0014] In the present invention, it is possible to achieve (d) a porous inorganic filler having a 50% particle size (D50) in the range of 0.1 μm or more and 10 μm or less, a pore volume in the range of 0.01 cc / g or more and 1.00 cc / g or less, and a specific surface area in the range of 5 m 2 / g and above and 500m 2 / g range below.

[0015] The present invention can include: (a) 44% to 80% by mass of acid-reactive glass powder; (b) 7.5% to 20% by mass of polyolefinic acid; (c) 7% to 32% by mass of water; and (d) 0.075% to 15% by mass of porous inorganic filler.

[0016] In the present invention, the time to start shaping in the dental glass ionomer cement composition can be reduced to within 30 seconds.

[0017] Hereinafter, the present invention will be described in detail.

[0018] In this specification, "dental glass ionomer cement" refers to a dental material in which a compound having a polymerizable group (a polymerizable monomer, an oligomer having a polymerizable group and / or a polymer having a polymerizable group, etc.) is not formulated for the purpose of imparting curing through a polymerization reaction, but is cured mainly through an acid-base reaction between an acid-reactive glass powder and a polyolefinic acid in the presence of water.

[0019] In this specification, "polyalkenoic acid" refers to a polymer containing ethylenically unsaturated monomer units having an acidic group. In addition, in this specification, "(meth)acrylate" is used to collectively describe both acrylate and methacrylate, and "(meth)acryloyl" is used to collectively describe both acryloyl and methacryloyl.

[0020] In this specification, the degree of stringiness of the kneaded product is evaluated by the following method. That is, a kneaded product of a dental glass ionomer cement composition (total amount specified as 360 mg) is filled into a simulated cavity of a certain size, the excess part is scraped off to make the surface flat, and then, 10 seconds after the end of kneading, the cylindrical front end of a metal instrument (diameter: φ1.5 mm) is immersed 0.5 mm vertically relative to the kneaded product, and the degree of stringiness when the instrument is immediately and gently lifted is confirmed. It should be noted that this test is carried out in an environment of temperature 23±1°C and humidity 50±10%. At this time, if the kneaded product has no stringiness or has slight stringiness, it is judged as "little stringiness, good kneaded product properties".

[0021] The degree of stringiness of the kneaded product was evaluated using the same method, and the time when the kneaded product showed "few stringiness and good kneaded product properties" as the base point after the completion of kneading was defined as the "time when shaping can be started."

[0022] In addition, in this specification, "50% particle size (D50)" refers to the particle size when the cumulative value from the small particle size side reaches 50% in the volume-based particle size distribution measured using a laser diffraction / scattering particle size distribution measuring device. The present invention relates to a kneading device for capsules for dental restorative materials, and 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 mixing and kneading dental cement. When using dental cement capsules, after mixing and kneading the two components using an automatic mixer such as a capsule blender, a filling device such as a filler is installed on the capsule, so that the dental cement inside the capsule can be filled into an applicable part such as a cavity. Conventionally, in the dental field, dental cement capsules have been widely used as containers for two-component mixing and kneading dental cement. When using dental cement capsules, the two components are mixed and kneaded using an automatic mixer such as a capsule blender. A filling device such as a filler is then attached to the capsule to allow the dental cement inside the capsule to be filled into the desired area such as a cavity.

[0023] In this specification, the “pore volume” refers to a value determined using the BJH method (Barrett-Joyner-Halenda method) from an adsorption isotherm obtained by a nitrogen adsorption method.

[0024] In this specification, the "specific surface area" refers to a value determined using the BET method (Brunauer-Emmett-Teller method) from an adsorption isotherm obtained by a nitrogen adsorption method.

[0025] When using the dental glass ionomer cement composition of the present invention, for example, a kneading device for dental restoration material capsules and capsules for mixing and dispensing dental materials can be used. Conventionally, dental cement capsules have been widely used in the dental field as containers for two-component mixing and kneading dental cements. When using dental cement capsules, the two components are mixed and kneaded using an automatic mixer such as a capsule blender. The capsule is then attached to a filling device such as a filler, and the kneaded mixture inside the capsule is then applied to the treatment site, such as a cavity.

[0026] The dental glass ionomer cement composition of the present invention comprises (a) acid-reactive glass powder; (b) polyolefinic acid; (c) water; and a specific (d) porous inorganic filler as essential components, with the porous inorganic filler (d) added in a specific amount. This composition has been found to reduce stringing in the kneaded product, improve cavity filling properties, and enhance coating properties on dental prosthetic devices. Furthermore, the composition allows for initial shaping after kneading, and exhibits good kneadability and excellent mechanical properties. The aforementioned components of the present invention are described in detail below.

[0027] <(a) Acid-reactive glass powder>

[0028] 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 helps solidify the composition and must contain an acid-reactive element such as a metal element and a fluorine element. By containing the acid-reactive element, the (a) acid-reactive glass powder undergoes an acid-base reaction with the acidic group of the (b) polyolefinic acid in the presence of (c) water. Specific examples of acid-reactive elements include sodium, potassium, calcium, strontium, barium, lanthanum, aluminum, and zinc, but are not limited thereto. These acid-reactive elements can include one or more, and their content is not particularly limited.

[0029] Furthermore, in order to impart X-ray radiopaque properties to the dental glass ionomer cement composition of the present invention, the acid-reactive glass powder (a) preferably contains an X-ray opaque element. Specific examples of X-ray opaque elements include, but are not limited to, strontium, lanthanum, zirconium, titanium, yttrium, ytterbium, tantalum, tin, tellurium, tungsten, and bismuth. Furthermore, other elements contained in the acid-reactive glass powder (a) are not particularly limited, and the acid-reactive glass powder (a) of the present invention can contain a variety of elements.

[0030] Examples of (a) acid-reactive glass powder include, but are not limited to, aluminosilicate glass, borosilicate glass, aluminoborate glass, boroaluminosilicate glass, phosphate glass, borate glass, and silicate glass containing the acid-reactive element shown above, fluorine, and an X-ray opaque element.

[0031] Furthermore, the particle shape of the (a) acid-reactive glass powder is not particularly limited, and any particle shape such as sphere, needle, plate, crushed, or scale can be used without limitation. These (a) acid-reactive glass powders can be used alone or in combination.

[0032] There are no particular limitations on the method for producing the acid-reactive glass powder (a). Any method, such as a melting method, a vapor phase method, or a sol-gel method, can be used without any problems. However, it is preferred to use the acid-reactive glass powder (a) produced by a melting method or a sol-gel method, as these methods allow for easy control of the type and content of elements.

[0033] (a) The acid-reactive glass powder can be ground to a desired particle size before use. The grinding method is not particularly limited, and powder ground by any wet or dry grinding method can be used. Specifically, the raw glass can be ground using a high-speed rotary mill such as a hammer mill or a turbine mill; a container-driven mill such as a ball mill, a planetary grinder, or a vibration mill; a medium-stirred mill such as a clay dry grinder (attritor) or a bead mill; or a jet mill. The particle size can be appropriately adjusted depending on the desired performance to be imparted to the dental glass ionomer cement composition of the present invention.

[0034] The 50% particle size (D50) of the (a) acid-reactive glass powder is preferably from 0.5 μm to 20 μm, more preferably from 2.5 μm to 20 μm. The dental glass ionomer cement composition of the present invention may contain only acid-reactive glass powder (a) having a 50% particle size (D50) of from 0.5 μm to 20 μm.

[0035] If the 50% particle size (D50) of the (a) acid-reactive glass powder is less than 0.5 μm, its surface area increases and it cannot be included in a large amount in the composition, so the mechanical properties may decrease. In addition, the operating margin time may be significantly shortened. If the 50% particle size (D50) of the (a) acid-reactive glass powder exceeds 20 μm, the mechanical properties may decrease. In addition, when used as a filling material, the surface of the material becomes rough after grinding, which may cause easy staining in the oral cavity. When used as an adhesive material, the coating thickness becomes thicker, causing the adhered and / or bonded dental prosthetic device to detach, and the desired effect suitable for the dental prosthetic device may not be obtained.

[0036] In order to adjust the operability or curing performance, mechanical properties, etc. of the dental glass ionomer cement composition of the present invention, various surface treatments, heat treatments, or agglomeration treatments in liquid phase or gas phase can be performed on (a) the acid-reactive glass powder without adversely affecting (b) the polyolefin acid-base reaction. In addition, these treatments can be performed alone, or several combinations can be performed, and the order in which each treatment is performed is not particularly limited. Wherein, from the viewpoint of easily controlling various properties and excellent productivity, surface treatment or heat treatment are more suitable.

[0037] Specific examples of the surface treatment of (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 polycarboxylic acid; surface treatment with a fluoride such as aluminum fluoride; surface treatment with silane compounds 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 treatment is not limited to the above-mentioned method. In addition, these surface treatments can be used alone or in combination. In addition, the amount of the surface treatment agent for (a) acid-reactive glass powder when surface treatment is performed is not particularly limited, as long as it is appropriately adjusted according to the particle size of (a) acid-reactive glass powder or the desired performance.

[0038] Specifically, (a) heat treatment of the acid-reactive glass powder can be performed using an electric furnace or the like at a temperature of 200°C to 800°C for a period of 1 to 72 hours. The heat treatment method used in the present invention is not limited to the above method, and the treatment process can also be a single temperature treatment or a multi-stage treatment at multiple temperature conditions.

[0039] The content of (a) acid-reactive glass powder in the dental glass ionomer cement composition of the present invention is preferably 44% to 80% by mass, more preferably 63% to 80% by mass. If the content of (a) acid-reactive glass powder is less than 44% by mass, mechanical properties may be degraded. If the content of (a) acid-reactive glass powder exceeds 80% by mass, workability may be adversely affected, such as significantly shortening the working margin time or increasing the viscosity of the kneaded product, resulting in poor kneading properties.

[0040] (b) Polyolefinic acid

[0041] The (b) polyolefinic acid that can be used in the dental glass ionomer cement composition of the present invention is a component that contributes to the curability of the composition. The (b) polyolefinic acid can be used without limitation, as long as it is a homopolymer or copolymer of an ethylenically unsaturated monomer having at least one carboxyl group in its molecule, such as an ethylenically unsaturated monocarboxylic acid, an ethylenically unsaturated dicarboxylic acid, or an ethylenically unsaturated tricarboxylic acid. Furthermore, there is no problem even if the (b) polyolefinic acid is a copolymer of an ethylenically unsaturated monomer having no carboxyl group in its molecule and an ethylenically unsaturated monomer having a carboxyl group. However, even such a copolymer preferably contains 60% or more of ethylenically unsaturated monomer units having a carboxyl group, more preferably 70% or more, and most preferably 80% or more.

[0042] Specific examples of ethylenically unsaturated monomers having a carboxyl group that can be used to obtain the polyalkenoic acid (b) 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 preferred to use the polyalkenoic acid (b) synthesized using only acrylic acid as a starting material, or 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.

[0043] The polymerization method used to obtain the various polyalkenoic acids (b) is not particularly limited, and any polymerization method such as solution polymerization, suspension polymerization, or emulsion polymerization can be used without any restriction. Furthermore, the polymerization initiator or chain transfer agent used during the polymerization can be a known substance, and the amount added can be appropriately adjusted according to the desired performance. The polyalkenoic acids (b) thus obtained can be used alone or in combination.

[0044] The weight average molecular weight of (b) polyolefinic acid is preferably 30,000 or more and 300,000 or less. Here, weight average molecular weight refers to the average molecular weight calculated based on the molecular weight distribution measured by gel permeation chromatography. If the weight average molecular weight of (b) polyolefinic acid is less than 30,000, mechanical properties may decline. In addition, if the weight average molecular weight of (b) polyolefinic acid exceeds 300,000, the situation that the operating margin time is significantly shortened or the viscosity of the kneaded product increases and the kneading property deteriorates may occur, which may have an adverse effect on operability. It should be noted that, in the dental glass ionomer cement composition of the present invention, as (b) polyolefinic acid, it is also possible to only include polyolefinic acid having a weight average molecular weight of 30,000 or more and 300,000 or less.

[0045] In addition, as long as it does not adversely affect the various properties, (b) polyolefinic acid can be used by neutralizing part of the carboxyl groups with an alkaline compound for the purpose of adjusting the acid-base reactivity with the acid-reactive glass powder (a). As the alkaline compound used for neutralization, there can be mentioned alkali metal hydroxides such as sodium hydroxide, potassium hydroxide, and lithium hydroxide; or alkali metal carbonates such as sodium carbonate, potassium carbonate, and lithium carbonate; or alkali metal bicarbonates such as sodium bicarbonate, potassium bicarbonate, and lithium bicarbonate. In addition, there is no problem in using various amine compounds such as primary amines, secondary amines, and tertiary amines. As the amine compound, triethanolamine, diethanolamine, N-methyldiethanolamine, 2-dimethylaminoethyl (meth)acrylate, etc. can be preferably used.

[0046] The content of (b) polyalkenoic acid in the dental glass ionomer cement composition of the present invention is preferably 7.5% to 20% by mass, more preferably 10% to 14% by mass, relative to the total weight of the composition. If the content of (b) polyalkenoic acid is less than 7.5% by mass, mechanical properties may be reduced. If the content of (b) polyalkenoic acid exceeds 20% by mass, workability may be adversely affected, such as significantly shortening the working time, increasing the viscosity of the kneaded product, and deteriorating kneading properties.

[0047] (c) Water

[0048] The (c) water that can be used in the dental glass ionomer cement composition of the present invention can function as a solvent for dissolving the (b) polyolefinic acid, and is also a component for diffusing the metal ions dissolved from the (a) acid-reactive glass powder and inducing a cross-linking reaction between the (b) polyolefinic acids.

[0049] (c) Water can be used without limitation 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 and adversely affect curability or mechanical properties. However, distilled water or ion-exchanged water is preferably used.

[0050] The content of (c) water in the dental glass ionomer cement composition of the present invention is preferably 7% to 32% by mass, more preferably 12% to 16% by mass, relative to the total weight of the composition. If the content of (c) water is less than 7% by mass, the workability may be adversely affected, such as by significantly shortening the working time or increasing the viscosity of the kneaded product, leading to poor kneading properties. Furthermore, if the content of (c) water exceeds 32% by mass, mechanical properties may be reduced.

[0051] <(d) Porous inorganic filler>

[0052] The porous inorganic filler (d) 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 determined, for example, by gas adsorption or mercury intrusion. More specifically, the porous inorganic filler (d) herein refers to a filler having a pore volume of 0.01 cc / g or greater as measured by gas adsorption. The dental glass ionomer cement composition of the present invention may not contain any filler other than the porous inorganic filler (d).

[0053] The shape of the (d) porous inorganic filler is not particularly limited, but is preferably spherical or crushed from the viewpoint of not easily affecting the viscosity of the kneaded product in the dental glass ionomer cement composition of the present invention. In addition, the 50% particle size (D50) of the (d) porous inorganic filler is preferably 0.1 μm or more and 10 μm or less, 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. In addition, when the 50% particle size (D50) is less than 0.1 μm, it may have an adverse effect on the kneading properties or the properties of the kneaded product.

[0054] (d) The pore volume of the porous inorganic filler is preferably 0.01 cc / g or more and 1.00 cc / g or less, more preferably 0.10 cc / g or more and 0.80 cc / g or less. In addition, (d) the specific surface area of ​​the porous inorganic filler is preferably 5 m 2 / g and above and 500m 2 / g or less, more preferably 10m 2 / g and above and 300m 2 / g or less. By virtue of the (d) porous inorganic filler having such properties, the stringiness of the kneaded product in the dental glass ionomer cement composition of the present invention can be effectively reduced. If the pore volume and / or specific surface area of ​​the (d) porous inorganic filler is smaller than the aforementioned range, the effect of reducing the stringiness of the kneaded product may be difficult to express. In addition, if the pore volume and / or specific surface area exceeds the aforementioned range, the mechanical properties may be reduced. It should be noted that, in the dental glass ionomer cement composition of the present invention, as the (d) porous inorganic filler, only 50% of the particle size (D50) is 0.1 μm or more and 10 μm or less, the pore volume is 0.01 cc / g or more and 1.00 cc / g or less, and the specific surface area is 5 m 2 / g and above and 500m 2 / g or less porous inorganic filler.

[0055] (d) porous inorganic filler has in the center portion and is only made of silicon dioxide, or is made of silicon dioxide and the inorganic particles of the oxide comprising one or more metallic elements.As the oxide comprising metallic element, the oxide of the metallic 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, Zr can be enumerated, but is not limited thereto.Wherein, preferably the oxide of Al, Ba, Ca, Co, Cu, Fe, Hf, La, Mg, Ni, Sr, Ti, Zn, Zr, more preferably the oxide of Ba, Ti, Zr etc., further preferably the oxide of Zr. In the dental glass ionomer cement composition of the present invention, the oxide containing the metal element as the inorganic particles constituting the core of the porous inorganic filler (d) may include only oxides of Al, Ba, Ca, Co, Cu, Fe, Hf, La, Mg, Ni, Sr, Ti, Zn, or Zr, or may include only oxides of Ba, Ti, or Zr, or may include only oxide of Zr.

[0056] The content of the oxide of the metal element contained in the inorganic particles in the center of the porous inorganic filler (d) is preferably 30% by mass or less, calculated as oxide. If the content of the oxide of the metal element exceeds 30% by mass, the refractive index of the porous inorganic filler (d) may be too high, and the dental glass ionomer cement composition of the present invention may become opaque.

[0057] (d) The inorganic particles in the center of the porous inorganic filler can be prepared by, for example, mixing an acidic silicic acid solution, a silica sol, and an aqueous solution of one or more metal salts, spray-drying the mixed slurry, and then heat-treating the resulting dried particles. (d) Detailed methods for producing the porous inorganic filler are disclosed in Japanese Patent Application Publication No. 2019-189637, etc., but are not limited to these methods.

[0058] Further, for the purpose of adjusting the fluidity of the powder material in the dental glass ionomer cement composition of the present invention or the properties of the paste, the inorganic particles in the center of the (d) porous inorganic filler can be optionally surface-treated with silane compounds such as (meth) acryloyloxymethyltrimethoxysilane, 3-(meth) acryloyloxypropyltrimethoxysilane, 8-(meth) acryloyloxyoctyltrimethoxysilane, 3-mercaptopropyltrimethoxysilane, 3-aminopropyltrimethoxysilane, 3-glycidoxypropyltrimethoxysilane. The surface treatment agent is not limited to the above-mentioned substances. In addition, these surface treatment agents can be used alone or in combination. In addition, the amount of the surface treatment agent relative to the inorganic particles in the center of the (d) porous inorganic filler is not particularly limited when surface treatment is carried out, and can be appropriately adjusted according to the particle size or pore volume, specific surface area and desired performance of the inorganic particles in the center of the (d) porous inorganic filler.

[0059] The content of the porous inorganic filler (d) in the dental glass ionomer cement composition of the present invention as a whole should be from 0.075% to 15% by mass, more preferably from 3% to 8% by mass. If the content of the porous inorganic filler (d) is less than 0.075% by mass, the effect of reducing stringiness of the kneaded product is not achieved. On the other hand, if it exceeds 15% by mass, mechanical properties are degraded, the viscosity of the kneaded product increases, and kneading properties deteriorate.

[0060] <Other ingredients>

[0061] In the dental glass ionomer cement composition of the present invention, an acidic compound can be arbitrarily contained for the purpose of adjusting the operating margin time or the curing time, as long as it does not adversely affect the various properties. Specific examples of acidic compounds include 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; phosphoric acid compounds such as phosphoric acid, pyrophosphoric acid, and tripolyphosphoric acid; and metal salts of these acidic compounds, but are not limited thereto. In addition, these acidic compounds can be used alone or in combination. When the dental glass ionomer cement composition of the present invention contains an acidic compound, the acidic compound is preferably contained in an amount of 0.1% by mass or more and 15% by mass or less relative to the entire composition. It should be noted that the dental glass ionomer cement composition of the present invention may also not contain an acidic compound.

[0062] Furthermore, the dental glass ionomer cement composition of the present invention may optionally contain a surfactant for the purpose of adjusting the initial compatibility of the powder material and liquid material, or the first paste and the second paste, or the properties of the kneaded product, as long as it does not adversely affect the 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.

[0063] Specific examples of ionic surfactants include anionic surfactants such as sodium stearate, metal salts of aliphatic carboxylic acids, such as sodium stearate, sulfated metal salts of aliphatic carboxylic acids, such as sodium dioctylsulfosuccinate, and metal salts of higher alcohol sulfates, such as sodium stearyl sulfate. Examples of cationic surfactants include addition products of higher alkylamines and ethylene oxide, amines derived from lower amines, and alkyltrimethylammonium salts such as lauryltrimethylammonium chloride. Furthermore, examples of amphoteric surfactants include metal salts of higher alkylaminopropionic acids, such as sodium stearylaminopropionate, and betaines, such as lauryldimethylbetaine.

[0064] In addition, examples of nonionic surfactants include polyethylene glycol types or polypropylene glycol types in which ethylene oxide or propylene oxide is added to higher alcohols, alkylphenols, fatty acids, higher aliphatic amines, aliphatic amides, etc.; or polyol types in which polyols, diethanolamines, sugars and fatty acids are ester-bonded.

[0065] The surfactants listed above are not limited thereto and can be used alone or in combination. When the dental glass ionomer cement composition of the present invention contains a surfactant, the surfactant is preferably contained in an amount of 0.001% by mass to 5% by mass relative to the total composition. It should be noted that the dental glass ionomer cement composition of the present invention may not contain a surfactant.

[0066] Furthermore, the dental glass ionomer cement composition of the present invention may optionally contain a non-acid-reactive powder having no pores for the purpose of adjusting workability, mechanical properties or curing properties, as long as it does not adversely affect the properties.

[0067] The non-acid-reactive powder without pores that can be used in the dental glass ionomer cement composition of the present invention can be used without particular limitation as long as it does not contain an element that reacts with the acidic group possessed by (b) polyolefinic acid. As the non-acid-reactive powder without pores, substances well-known in the dental field can be cited, such as inorganic fillers, organic fillers, and organic-inorganic composite fillers, which can be used alone or in combination. Among them, inorganic fillers are particularly preferred. In addition, the shape of these non-acid-reactive powders without pores is not particularly limited, and can be any shape such as spherical, needle-shaped, plate-shaped, crushed, or scaly. The 50% particle size (D50) of these non-acid-reactive powders without pores is not particularly limited, but is preferably 0.001 μm or more and 30 μm or less.

[0068] Specific examples of inorganic fillers without pores include, but are not limited to, quartz, amorphous silica, ultrafine silica, various glasses that do not contain elements that react with acidic groups (including glasses produced using a melting process, synthetic glasses produced using a sol-gel process, and glasses produced by a gas phase reaction), silicon nitride, silicon carbide, and boron carbide. These inorganic fillers without pores can be used alone or in combination.

[0069] When the dental glass ionomer cement composition of the present invention contains a non-acid-reactive powder having no pores, the non-acid-reactive powder having no pores is preferably contained in an amount of 0.001% by mass to 20% by mass relative to the entire composition. It should be noted that the dental glass ionomer cement composition of the present invention may not contain a non-acid-reactive powder having no pores.

[0070] Furthermore, when the dental glass ionomer cement composition of the present invention has a paste-like form, a thickener may be optionally contained for the purpose of adjusting the paste properties within a range that does not adversely affect various properties.

[0071] 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. Examples of the inorganic thickener include clay minerals such as fumed silica, calcium carbonate, calcium silicate, magnesium silicate, saponite, montmorillonite, beidellite, vermiculite, sauconite, stevensite, hectorite, smectite, nectite, and sepiolite.

[0072] Examples of the organic thickener include methylcellulose, hydroxyethylcellulose, hydroxymethylcellulose, hydroxypropylcellulose, carboxymethylcellulose, sodium carboxymethylcellulose, calcium carboxymethylcellulose, carboxypolymethylene, sodium alginate, propylene glycol alginate, sodium polyacrylate, starch, sodium starch glycolate, starch phosphate, polyvinyl pyrrolidone, carboxyvinyl polymer, khaya gum, gum arabic, karaya gum, guar gum, and xanthan gum.

[0073] The above-mentioned thickeners are not limited thereto and can be used alone or in combination. When the dental glass ionomer cement composition of the present invention contains a thickener, the thickener is preferably contained in the paste in an amount of 0.001% by mass to 10% by mass. It should be noted that the dental glass ionomer cement composition of the present invention may not contain a thickener.

[0074] Furthermore, the dental glass ionomer cement composition of the present invention may optionally contain an antiseptic, an antibacterial agent, a colorant, a fluorescent agent, an inorganic fiber material, an organic fiber material, and other conventionally known additives, as needed.

[0075] The dental glass ionomer cement composition of the present invention can be provided in various forms such as powder material / liquid material, paste / paste, paste / powder material, and paste / liquid material, as long as (a) the acid-reactive glass powder and (b) the polyolefinic acid do not coexist in the presence of (c) water.

[0076] The dental glass ionomer cement composition of the present invention is preferably designed to shorten the time it takes to start shaping by adjusting the amounts of the components listed above, thereby shortening the treatment time. To shorten the treatment time, the time it takes to start shaping is preferably within 30 seconds, more preferably within 20 seconds.

[0077] The dental glass ionomer cement composition of the present invention can be widely used as a filling material and an adhesive material, as well as a pit and fissure sealing material, a base (restoration) material, an abutment construction material, and the like in dental treatment.

[0078] [Example]

[0079] The present invention is described in detail 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 dental glass ionomer cement compositions in Examples and Comparative Examples, their abbreviations, and production methods are as follows.

[0080] [(a) Acid-reactive glass powder]

[0081] G1: Acid-reactive glass powder 1 (G1) (fluoroaluminosilicate glass powder, 50% particle size (D50): 2.5 μm).

[0082] G2: Acid-reactive glass powder 2 (G2) (fluoroaluminosilicate glass powder, 50% particle size (D50): 20 μm).

[0083] G3: Acid-reactive glass powder 3 (G3) (fluoroaluminosilicate glass powder, 50% particle size (D50): 25 μm).

[0084] [(b) Polyolefinic acid]

[0085] PCA1: acrylic acid-tricarboxylic acid copolymer powder (weight average molecular weight: 80,000).

[0086] PCA2: acrylic acid-tricarboxylic acid copolymer powder (weight average molecular weight: 140,000).

[0087] PCA3: acrylic acid-homopolymer powder (weight average molecular weight: 50,000).

[0088] PCA4: acrylic acid-homopolymer powder (weight average molecular weight: 300,000).

[0089] PCA5: acrylic acid-homopolymer powder (weight average molecular weight: 10,000).

[0090] PCA6: acrylic acid-homopolymer powder (weight average molecular weight: 350,000).

[0091] [(c) Water]

[0092] IEW: ion-exchanged water.

[0093] [(d) Porous inorganic filler]

[0094] PIF1: porous inorganic filler (SiO2: 80 mass%, ZrO: 20 mass%, 50% particle size (D50): 2.0 μm, pore volume: 0.08 cc / g, specific surface area: 15 m 2 / g).

[0095] PIF2: porous inorganic filler (SiO2: 80 mass%, ZrO: 20 mass%, 50% particle size (D50): 3.0 μm, pore volume: 0.20 cc / g, specific surface area: 135 m 2 / g).

[0096] PIF3: porous inorganic filler (SiO2: 80 mass%, ZrO: 20 mass%, 50% particle size (D50): 4.0 μm, pore volume: 0.30 cc / g, specific surface area: 200 m 2 / g).

[0097] PIF4: porous inorganic filler (SiO2: 100 mass%, 50% particle size (D50): 9.0 μm, pore volume: 0.80 cc / g, specific surface area: 200 m 2 / g).

[0098] PIF5: Surface treated porous inorganic filler (SiO2: 80 mass%, ZrO: 20 mass%, 50% particle size (D50): 3.0 μm, pore volume: 0.19 cc / g, specific surface area: 133 m 2 / g).

[0099] PIF6: porous inorganic filler (SiO2: 94 mass%, TiO2: 6 mass%, 50% particle size (D50): 2.9 μm, pore volume: 0.21 cc / g, specific surface area: 173 m 2 / g).

[0100] PIF7: porous inorganic filler (SiO2: 70 mass%, ZrO: 30 mass%, 50% particle size (D50): 2.9 μm, pore volume: 0.19 cc / g, specific surface area: 161 m 2 / g).

[0101] PIF8: porous inorganic filler (SiO2: 65 mass%, ZrO: 35 mass%, 50% particle size (D50): 2.9 μm, pore volume: 0.17 cc / g, specific surface area: 149 m 2 / g).

[0102] [Other ingredients]

[0103] Fuselex X: Crushed silica filler (non-acid-reactive powder without pores, 50% particle size (D50): 3.0 μm, pore volume: less than 0.01 cc / g).

[0104] Degussa R972 (AEROSIL R972): Spherical silica filler (thickener, primary particle size 16 nm, pore volume: less than 0.01 cc / g).

[0105] TA: Tartaric acid.

[0106] [(a) Production of Acid-Reactive Glass Powder]

[0107] [Manufacturing of Acid-Reactive Glass Powder 1 (G1)]

[0108] After mixing various raw materials of silica, alumina, aluminum phosphate, sodium fluoride, and strontium carbonate (glass composition: SiO2 26.4 mass%, Al2O3 29.3 mass%, SrO 20.5 mass%, P2O5 10.9 mass%, Na2O 2.5 mass%, F 10.4 mass%), the raw material mixture was melted in a melting furnace at 1400°C. The melt was removed from the melting furnace and rapidly cooled in water to obtain fluoroaluminosilicate glass. The obtained fluoroaluminosilicate glass was pulverized until the 50% particle size (D50) reached 2.5 μm, obtaining 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 Co., Ltd.).

[0109] [Production of Acid-Reactive Glass Powder 2 (G2)]

[0110] The same method as for the acid-reactive glass powder 1 was used to prepare the glass powder except that the pulverization time was adjusted so that the 50% particle size was 20 μm.

[0111] [Manufacturing of Acid-Reactive Glass Powder 3 (G3)]

[0112] The same method as for the acid-reactive glass powder 1 was used to prepare the powder except that the pulverization time was adjusted so that the 50% particle size was 25 μm.

[0113] [Manufacturing of surface-treated porous inorganic filler (PIF5)]

[0114] A surface treatment solution (total mass: 9.2 parts by mass) was prepared by mixing 0.3 parts by mass of γ-methacryloxypropyltrimethoxysilane, 0.1 parts by mass of ion-exchanged water, and 8.8 parts by mass of anhydrous ethanol. This surface treatment solution was dry-mixed with 100 parts by mass of a porous inorganic filler (PIF2), and then heat-treated at 110° C. for 5 hours in a hot air dryer to obtain a surface-treated porous inorganic filler (PIF5).

[0115] [Preparation of Powder Material and Liquid Material or First Paste and Second Paste]

[0116] The various components were mixed in the ratios shown in Tables 1 to 5 to prepare a powder material, a liquid material, a first paste, and a second paste, respectively.

[0117] Compositions (mass %) of powder materials used in Examples and Comparative Examples.

[0118] [Table 1]

[0119]

[0120] Compositions (mass %) of powder materials used in Examples and Comparative Examples.

[0121] [Table 2]

[0122]

[0123] Compositions (mass %) of liquid materials used in Examples and Comparative Examples.

[0124] [Table 3]

[0125]

[0126] Composition (mass %) of the first paste used in Examples and Comparative Examples.

[0127] [Table 4]

[0128]

[0129] Composition (mass %) of the second paste used in Examples and Comparative Examples

[0130] [Table 5]

[0131]

[0132] [Dental glass ionomer cement composition]

[0133] For the dental glass ionomer cement compositions for filling or adhesion (Examples 1 to 33, Comparative Examples 1 to 7) in which the powder material and the liquid material or the first paste and the second paste are combined at the powder-liquid ratio or paste ratio (mass ratio) shown in Tables 6 to 9, the kneading properties, the stringiness of the kneaded product, the time when the shaping can be started, and the compressive strength were evaluated. It should be noted that for Examples 1 to 16, 20, 22 to 25, 27 to 32 as the composition for filling and Comparative Examples 1 and 3 to 6, all the above test items were evaluated, and for Examples 17 to 19, 21, 26, 33 as the composition for adhesion and Comparative Examples 2 and 7, the above test items except the time when the shaping can be started were evaluated. The evaluation method is as follows.

[0134] 〔Kneading properties〕

[0135] In an environment of temperature 23±1°C and humidity 50±10%, the powder material and liquid material or the first paste and the second paste of the dental glass ionomer cement composition of the embodiment or comparative example were kneaded in the proportions shown in Tables 6 to 9 using a plastic scraper. At this time, the time from the start of kneading to the time when no powder material residue was visually confirmed in the kneaded product and the kneaded product became uniform was measured. It should be noted that the total amount of the powder material and the liquid material or the first paste and the second paste was set to 360 mg. When evaluated according to the following evaluation criteria, it was judged that the kneading property was good when it was A or B. The evaluation was performed by 3 evaluators for 3 times, and the average of the measurement results was evaluated based on the following evaluation criteria as the evaluation result of the measurement object.

[0136] -Evaluation Criteria-

[0137] 〔Powder-liquid type〕

[0138] A: The time until the kneaded product becomes uniform is less than 30 seconds.

[0139] B: The time until the kneaded product becomes uniform is 30 seconds or more and less than 50 seconds.

[0140] C: The time until the kneaded product becomes uniform is 50 seconds or longer, or the kneaded product does not become uniform.

[0141] 〔Ointment type〕

[0142] A: The time until the kneaded product becomes uniform is less than 10 seconds.

[0143] B: The time until the kneaded product becomes uniform is 10 seconds or more and less than 20 seconds.

[0144] C: The time until the kneaded product becomes uniform is 20 seconds or longer.

[0145] 〔Drawing of kneaded material〕

[0146] In an environment of temperature 23±1°C and humidity 50±10%, a plastic scraper was used to knead the powder material and liquid material or the first paste and the second paste of the dental glass ionomer cement composition of the embodiment or comparative example in the proportions shown in Tables 6 to 9. It should be noted that the total amount of the powder material and the liquid material or the first paste and the second paste was set to 360 mg. After the kneading was completed, the kneaded product was immediately filled into a plastic simulated cavity (a 4mm×8mm×2mm cavity simulating a Class I cavity), and the excess was scraped off to make the surface smooth. 10 seconds after the end of the kneading, the cylindrical front end (diameter φ1.5mm) of a metal instrument (MiCD instrument manufactured by Matsukaze Co., Ltd.) was vertically immersed in the kneaded product by 0.5mm, and the instrument was immediately gently lifted. At this time, the degree of stringiness of the kneaded product was evaluated according to the following evaluation criteria. In the case of A or B, it was judged that there was little stringiness and that the kneaded product had good properties. The evaluation was performed three times by three evaluators, and the most frequent evaluation result was used as the evaluation result of the measurement object.

[0147] -Evaluation Criteria-

[0148] A: No drawing.

[0149] B: Slightly brushed.

[0150] C: There is obvious brushing.

[0151] [Time to start shaping]

[0152] In an environment of temperature 23±1°C and humidity 50±10%, a plastic scraper was used to knead the powder material and liquid material or the first paste and the second paste of the dental glass ionomer cement composition of the embodiment or comparative example in the proportions shown in Tables 6 to 9. It should be noted that the total amount of the powder material and the liquid material or the first paste and the second paste was set to 360 mg. After the kneading was completed, the kneaded material was immediately filled into a plastic simulated cavity (a 4mm×8mm×2mm cavity simulating a Class I cavity), and the excess was scraped off to make the surface flat. The front end (diameter φ1.5mm) of the instrument (MiCD instrument, manufactured by Matsukaze Co., Ltd.) was vertically immersed in the kneaded material by 0.5mm, and the instrument was immediately gently lifted. At this time, the time until the kneaded material was reduced to a state where the shaping operation could be performed was measured at intervals of 10 seconds, with the end of kneading as the base point. When evaluated according to the following evaluation criteria, in the case of A or B, it was judged that the time when the shaping could be started was earlier. The evaluation was performed three times by three evaluators, and the average of the measurement results was evaluated based on the following evaluation criteria to be used as the evaluation result of the measurement object.

[0153] -Evaluation Criteria-

[0154] A: Stringiness of the kneaded product decreased 20 seconds after the end of kneading, and shaping operation became possible.

[0155] B: Stringiness of the kneaded product decreased 30 seconds after the end of kneading, and shaping operation became possible.

[0156] C: Stringiness of the kneaded product decreased 40 seconds or more after the end of kneading, and shaping operation was possible.

[0157] 〔Compressive strength〕

[0158] The compressive strength was measured according to the following procedures in accordance with ISO 9917-1:2007. In an environment of temperature 23±1°C and humidity 50±10%, the powder material and liquid material or the first paste and the second paste of the dental glass ionomer cement composition of the embodiment or comparative example were kneaded in the proportions shown in Tables 6 to 9 using a plastic spatula. The kneaded product was filled into a stainless steel mold (cylindrical with an inner diameter of 4 mm and a height of 6 mm), and then allowed to stand in a constant temperature and humidity chamber at a temperature of 37°C and a humidity of 90% or more. After standing for 1 hour, the cured product was taken out of the mold and used as a test piece. The test piece was immersed in ion exchange water at 37°C for 24 hours from the end of kneading, and then the compressive strength of the test piece was measured using an Instron universal testing machine (model: 5567A) at a crosshead speed of 1 mm / min. When evaluated according to the following evaluation criteria, it was judged to have good mechanical properties in the case of A or B. In the evaluation, the measurement was performed five times, and the average of the measurement results was evaluated based on the following evaluation criteria to be used as the evaluation result of the measurement object.

[0159] -Evaluation Criteria-

[0160] [Filling composition]

[0161] A: The compressive strength is 220 MPa or more.

[0162] B: The compressive strength is 200 MPa or more and less than 220 MPa.

[0163] C: The compressive strength is less than 200 MPa.

[0164] [Adhesive composition]

[0165] A: The compressive strength is 160 MPa or more.

[0166] B: The compressive strength is 140 MPa or more and less than 160 MPa.

[0167] C: The compressive strength is less than 140 MPa.

[0168] The results of evaluation of each composition of Examples and Comparative Examples according to the above-mentioned test method are shown in Tables 6 to 9.

[0169]

[0170]

[0171]

[0172] [Table 9] Evaluation results of Comparative Examples 1 to 7

[0173]

[0174] <Examples 1 to 16, 20, 22 to 25, 27 to 32>

[0175] Examples 1-16, 20, 22-25, and 27-32 exhibited minimal stringing immediately after kneading, enabling initial shaping after filling the simulated cavity. Furthermore, they exhibited excellent kneadability and mechanical properties, demonstrating ideal properties for dental glass ionomer cement compositions for filling.

[0176] <Examples 17 to 19, 21, 26, and 33>

[0177] Examples 17 to 19, 21, 26, and 33 showed little stringing immediately after kneading. Furthermore, they exhibited good kneading properties and mechanical properties, and possessed ideal properties as dental glass ionomer cement compositions for adhesive applications.

[0178] Comparative Example 1

[0179] The dental glass ionomer cement composition for filling of Comparative Example 1 did not contain the porous inorganic filler (d). Evaluation of Comparative Example 1 revealed that stringiness was evident immediately after kneading, and that a long time was required for shaping.

[0180] Comparative Example 2

[0181] The (d) porous inorganic filler was not included in the adhesive dental glass ionomer cement composition of Comparative Example 2. Evaluation of Comparative Example 2 revealed that significant stringing was observed immediately after kneading.

[0182] Comparative Example 3

[0183] The dental glass ionomer cement composition for filling of Comparative Example 3 contained a large amount of the porous inorganic filler (d). The evaluation results of Comparative Example 3 showed that the compressive strength was low.

[0184] Comparative Example 4

[0185] The content of the porous inorganic filler (d) was low in the dental glass ionomer cement composition for filling of Comparative Example 4. Evaluation of Comparative Example 4 revealed that significant stringing was observed immediately after kneading, and that a long time was required for shaping.

[0186] <Comparative Example 5>

[0187] The dental glass ionomer cement composition for filling of Comparative Example 5 contained a non-acid-reactive powder having no pores instead of the porous inorganic filler (d). Evaluation of Comparative Example 5 revealed significant stringing immediately after kneading, indicating that a long time was required before shaping was possible.

[0188] <Comparative Example 6>

[0189] The dental glass ionomer cement composition for filling of Comparative Example 6 did not contain the porous inorganic filler (d). Evaluation of Comparative Example 6 revealed that significant stringing was observed immediately after kneading, and that a long time was required for shaping.

[0190] <Comparative Example 7>

[0191] The (d) porous inorganic filler was not included in the adhesive dental glass ionomer cement composition of Comparative Example 7. As a result of evaluation of Comparative Example 7, clear stringing was observed immediately after kneading.

[0192] In this specification, even when a disclosed component is described in either the singular or the plural, or is described without limitation in the singular or the plural, the component may be in either the singular or the plural unless the context indicates otherwise.

[0193] Although the present invention has been described with reference to detailed embodiments, it should be understood by those skilled in the art that various changes or modifications can be made based on the matters disclosed in this specification. Therefore, any changes or modifications should be included within the scope of the embodiments of the present invention.

[0194] The dental glass ionomer cement composition of the present invention can be preferably used for dental treatments such as filling of tooth cavities, base coating or foundation, adhesion between dental prosthetic devices such as crowns, inlays, and bridges and dentin, pit and fissure sealing, preventive coating of tooth surfaces, and abutment construction.

Claims

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

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

3. The dental glass ionomer cement composition according to claim 1 or 2, wherein: The dental glass ionomer cement composition comprises: 44% by mass or more and 80% by mass or less of the (a) acid-reactive glass powder; 7.5% by mass or more and 20% by mass or less of the (b) polyalkenoic acid; 7% by mass or more and 32% by mass or less of the (c) water; and 0.075% by mass or more and 15% by mass or less of the (d) porous inorganic filler.

4. The dental glass ionomer cement composition according to claim 1 or 2, wherein The time required to start shaping the dental glass ionomer cement composition is within 30 seconds.

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

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