Dental shade-matching confirmation material

Abstract

To improve the storage stability of paste properties of "a dental shade-matching confirmation material which comprises a polyhydric alcohol (a), water (b) and a filler (c) each contained at a predetermined ratio, and optionally blended with a pigment (d) to adjust the shade to a predetermined color tone", which is known to have a paste property similar to that of a dental cement and to exhibit excellent removability by water washing after trial fitting work.SOLUTION: In the dental shade-matching confirmation material, an inorganic salt (e) having a solubility in water of 10 g or more is blended, where the content ratio of (a) in a liquid component composed of (a) and (b) is set to 38-62 mass% {the content ratio of (b) being 62-38 mass%}, and the blending amounts of (c) and (e) relative to 100 pts.mass of the liquid component are set to 5-13 pts.mass and 3-13 pts.mass, respectively.SELECTED DRAWING: None

Description

[Technical Field]

[0001] The present invention relates to a dental shade matching material. [Background technology]

[0002] Prosthetic treatment in dentistry is performed by bonding dental prostheses such as inlays, onlays, and veneers to abutment teeth using dental cement. Dental cement is a paste-like hardening material used for bonding in prosthetic treatment, and is generally provided in several different colors so that the color after hardening can be selected according to the case. When bonding a prosthesis with a certain degree of transparency, the color after restoration is affected by the color of the hardened dental cement. Therefore, in order to perform highly aesthetic restorations, it is necessary to select and use a dental cement with a (hardened) color that will provide an appropriate color after restoration.

[0003] Dental color matching confirmation materials are trial-application dental cement substitutes. They consist of a non-hardening paste-like composition (sometimes called a "try-in paste") that is color-matched to the hardened dental cement. Colors corresponding to each type of dental cement are prepared. To perform aesthetic prosthetic treatment, a dental color matching confirmation material is used instead of dental cement to temporarily try on a dental prosthesis on an abutment tooth, and its aesthetics are confirmed. If the desired color is achieved, the prosthesis is removed, and the dental color matching confirmation material adhering to the inner surface of the prosthesis and the abutment tooth is removed by rinsing with water. The prosthesis is then cemented using a dental cement (of a color) that corresponds to the dental color matching confirmation material used. If the desired color is not achieved during the trial, a new trial is performed using a different color of the color matching confirmation material, and this process is repeated until the desired aesthetics are achieved.

[0004] Dental color matching confirmation materials used in this way are required to have paste properties similar to those of dental cement (before hardening) and to be easily removably by rinsing with water after the trial application, and dental color matching confirmation materials that meet these requirements are known. Specifically, Patent Document 1 discloses a dental color matching confirmation material that contains 0 to 0.1 parts by mass of (d) a pigment per 100 parts by mass of a composition containing (a) 10 to 79% by mass of a polyhydric alcohol, (b) 20 to 60% by mass of water, and (c) 1 to 30% by mass of a filler.

[0005] When dental cement is used, it may be applied to a predetermined position using a syringe, and for this reason, the dental curable composition is often provided as a kit in which it is held in a syringe-type container whose discharge port is sealed with a cap and can be used as is by attaching a nozzle and pushing it out. Furthermore, a dental color matching confirmation material corresponding to the dental cement provided as a kit in this way is also usually provided as a kit held in a syringe-type container. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Japanese Patent Application Laid-Open No. 2011-132185 Summary of the Invention [Problem to be solved by the invention]

[0007] The dental color matching confirmation material disclosed in Patent Document 1 (hereinafter also referred to as "the color matching confirmation material of Document 1") has the above-mentioned favorable features, but when it is made into a kit using a syringe-type container, it has been found that the paste tends to harden when stored unused for a long period of time or when partially used, capped, and reused after a period of time. When the paste hardens, not only does it feel heavy when extruding from the syringe, but the coating thickness during try-in becomes thicker, resulting in an appearance color that is darker than the desired color, creating the risk of not being able to select the correct dental cement.

[0008] Therefore, the present invention aims to provide a dental color matching confirmation material, such as the color matching confirmation material in Reference 1, which has paste properties similar to dental cement and is easily removable by rinsing with water after the trial fitting process, and which is less likely to change in paste properties even after long-term storage. [Means for solving the problem]

[0009] The present invention solves the above-mentioned problems, and a first aspect of the present invention is a dental color matching confirmation material comprising a paste-like composition containing a polyhydric alcohol (a), water (b), and a filler (c), wherein the proportions of each component relative to the total amount of (a) to (c) are (a): 10 to 79 mass%, (b): 20 to 60 mass%, and (c): 1 to 30 mass%, and the composition is toned to a predetermined color tone by blending a pigment (d) as necessary, 38 to 62 mass % of the liquid component consisting of (a) and (b) is (a), The composition further comprises an inorganic salt (e) having a solubility of 10 g or more in 100 g of water at 25°C; The contents of (c) and (e) relative to 100 parts by mass of the liquid component are (c): 5 to 13 parts by mass and (e): 3 to 13 parts by mass, respectively. This is a dental color matching confirmation material characterized by the above.

[0010] In the dental color tone matching confirmation material of the above form (hereinafter also referred to as "dental color tone matching confirmation material of the present invention"), it is preferable that the inorganic salt (e) consists of a cation selected from sodium ions, potassium ions, magnesium ions, and barium ions, and an anion selected from fluoride ions, chloride ions, and sulfate ions.

[0011] It is also preferable that the polyhydric alcohol (a) comprises polyethylene glycol.

[0012] A second aspect of the present invention is a kit comprising a single syringe type container having a cylindrical barrel with a discharge port at its tip sealed by a removable cap, and a plunger with a gasket at its tip, wherein the gasket can be slidably inserted from the rear end of the barrel to hold a fluid in a fluid storage space formed in the barrel on the tip side of the gasket, and the dental shade matching confirmation material of the present invention, This single-syringe-filled dental color matching confirmation material kit (hereinafter also referred to as the "kit of the present invention") is characterized in that the dental color matching confirmation material is held within the fluid storage space of the container, and when in use, the dental color matching confirmation material can be ejected from the nozzle by attaching a nozzle to the ejection outlet whose cap has been removed and pushing the plunger into the barrel. [Effects of the Invention]

[0013] The dental color matching confirmation material of the present invention, like the color matching confirmation material in Reference 1, has the advantages of having a paste-like texture similar to dental cement and being easily removable by rinsing with water after the trial application. In addition, it has the new advantages of having little change in paste hardness over time, low "dripping" and being easier to adjust the thickness of the coating formed during trial application to a thickness similar to that of the coating formed by the dental cement (actually used).

[0014] "Sagging" is evaluated by the flow distance caused by the weight of a given amount of paste placed on a vertical surface, and dental cements have low "sagging" for the following reasons. When dental cement is used to bond a tooth to a crown restorative material, an excess amount of dental cement is applied to the crown restorative material and the material is pressed against the tooth. During this process, it is necessary to remove the excess dental cement (also referred to as "excess cement") that overflows from the junction between the tooth and crown restorative material, known as the margin, during the pressure application. However, if "sagging" is excessive, the excess cement will spread over a wide area, making removal difficult. Therefore, "sagging" is kept low. DETAILED DESCRIPTION OF THE INVENTION

[0015] 1. Overview of the Invention The present inventors believed that the change in paste properties over time in the color matching confirmation material in Reference 1 was probably caused by the evaporation of the water contained in large amounts in the dental color matching confirmation material during storage, and after extensive research into ways to prevent this, they discovered that the addition of inorganic salts can sometimes prevent changes in paste hardness. It is believed that the addition of inorganic salts reduces the vapor pressure of water in the liquid components, making it more difficult for the water to evaporate, thereby preventing changes in paste properties.

[0016] Therefore, further investigation was conducted into the effects of the type and amount of inorganic salt added, and the inventors found that: (1) the solubility of the inorganic salt in water affects the paste discharge pressure, and when an inorganic salt with low solubility is added, the discharge pressure increases and operability deteriorates; (2) when an inorganic salt with a solubility of 10 or more in 100 g of water at 25°C is added within a certain range in which it dissolves, it is possible to achieve both an appropriate discharge pressure and stability in paste hardness over long-term storage; and (3) the addition of an inorganic salt suppresses the sagging of the paste, resulting in a paste with properties closer to those of dental cement, which led to the completion of the present invention.

[0017] It is believed that the reduction in "sagging" is due to the fact that the addition of inorganic salts causes hydroxyl groups present in the polyhydric alcohol molecules and on the surface of the filler to be cross-linked by ions, resulting in the development of thixotropy.

[0018] The dental color matching confirmation material of the present invention will be described in detail below. In this specification, unless otherwise specified, the expression "x to y" using numerical values ​​x and y means "greater than or equal to x and less than or equal to y." In such an expression, when a unit is assigned only to the numerical value y, the unit also applies to the numerical value x.

[0019] 2. Dental color matching confirmation material of the present invention The dental color matching confirmation material of the present invention is the color matching confirmation material of Document 1, i.e., a paste-like composition containing a polyhydric alcohol (a), water (b), and a filler (c), wherein the proportions of each component relative to the total amount of (a) to (c) are (a): 10 to 79 mass%, (b): 20 to 60 mass%, and (c): 1 to 30 mass%, and the dental color matching confirmation material is composed of a composition that has been toned to a predetermined color by blending a pigment (d) as necessary, The liquid component consisting of (a) and (b) accounts for 38 to 62 mass % of (a) {the remainder is naturally (b)}, The content of (c) is 5 to 13 parts by mass relative to 100 parts by mass of the liquid component, and - further blending an inorganic salt (e) having a solubility of 10 g or more in 100 g of water at 25 ° C., in an amount of 3 to 13 parts by mass relative to 100 parts by mass of the liquid component; It has a major feature.

[0020] Other than the above points, the dental color tone matching confirmation material of the present invention is not particularly different from the color tone matching confirmation material of Document 1, and the same materials can be used as the polyhydric alcohol (a), filler (c), pigment (d), etc. Below, each component of the dental color tone matching confirmation material of the present invention will be explained, including these points.

[0021] (1) Polyhydric alcohol (a) and water (b) In the dental color matching confirmation material of the present invention, the polyhydric alcohol (a) and water (b) constitute the liquid component. Since the dental color matching confirmation material does not need to have hardening properties like dental cement, it does not need to contain a (usually liquid) polymerizable monomer, and the liquid component of the dental color matching confirmation material of the present invention also consists of (a) and (b).

[0022] The polyhydric alcohol (a) refers to a water-soluble compound having at least two hydroxyl groups in the molecule, and at least one compound selected from the group consisting of propylene glycol, dipropylene glycol, polypropylene glycol, ethylene glycol, diethylene glycol, polyethylene glycol, hexylene glycol, glycerin, 1,3-butylene glycol, 1,2,6-hexanetriol, ethoxylated glycerin, and propoxylated glycerin is preferably used. Note that polypropylene glycol and polyethylene glycol may be solid at room temperature depending on their molecular weight, but even if they are solid at room temperature, they can be used in an amount that dissolves in water or in water and (a), which is liquid at room temperature, to form a liquid (as a whole).

[0023] From the viewpoints of removability by rinsing with water, uniformity of the dental color matching confirmation material (difficulty in separating components), solubility in water, etc., it is preferable to use, as the polyhydric alcohol (a), a mixture comprising 100 parts by mass of the at least one compound that is liquid at 25°C and 0.01 to 10 parts by mass, preferably 0.1 to 7 parts by mass of at least one compound that is solid at 25°C and has a weight-average molecular weight of 10,000 to 250,000, preferably 20,000 to 100,000, and it is particularly preferable to use the above mixture in which both the liquid compound and the solid compound are polyethylene glycol.

[0024] Here, being liquid at 25°C means that the viscosity measured at 25°C is 3000 mPa·s or less, more preferably 2000 mPa·s or less.

[0025] The water (b) is preferably substantially free of harmful impurities from the viewpoints of storage stability, biocompatibility, and adhesiveness, and deionized water, distilled water, etc. are preferably used.

[0026] In the dental color matching confirmation material of the present invention, the content ratio of the polyhydric alcohol (a) and water (b) in the liquid component must be such that the content of (a) is 38 to 62% by mass, with the remainder (62 to 38% by mass) being water (b). If the content of (a) is less than 38% by mass, the content of water (b) in the color matching confirmation material will be high, resulting in significant changes in paste properties after long-term storage. If the content of (a) exceeds 62% by mass, the inorganic salt (e) will be less soluble in the liquid component, making it difficult to prepare a uniform paste. Even if a uniform paste can be prepared, the content of water in the color matching confirmation material will be low, which tends to reduce cleanability by rinsing with water. The content ratio of the two in the liquid component is preferably 40 to 60% by mass of (a) and 60 to 40% by mass of (b).

[0027] (2) Filler (c) The filler (c) is blended to form a paste and impart shapeability to the composition. Suitable fillers include inorganic fillers composed of powders of inorganic particles such as silicon dioxide (quartz, glass, silica, etc.), metal oxides such as alumina, ceramics, clay minerals such as diatomaceous earth, kaolin, and montmorillonite, activated clay, synthetic zeolite, mica, calcium phosphate, and barium sulfate, as well as organic fillers composed of powders of resin particles such as polymethyl methacrylate (PMMA), polyethyl methacrylate (PEMA), polyfunctional methacrylate polymers, polyamide, polystyrene, polyvinyl chloride, chloroprene rubber, nitrile rubber, and styrene-butadiene rubber. These inorganic and / or organic fillers may be used alone or in combination. They may also be treated with a surface treatment agent such as a silane coupling agent.

[0028] These fillers can generally be selected from those with an average particle size in the range of 0.001 to 50 μm. Fillers with an average particle size of 0.001 to 20 μm are preferred, with inorganic fine particles of 0.001 to 0.030 μm being more preferred due to their excellent thickening properties. Metal oxides such as silica alumina are particularly preferred, with fumed silica being optimal. Here, the average particle size refers to the median diameter value expressed on a volume basis, measured using a laser diffraction / scattering particle size distribution analyzer based on the Mie scattering theory.

[0029] In the dental color matching confirmation material of the present invention, the blending amount of the filler (c) is 5 to 13 parts by mass, preferably 7 to 11 parts by mass, per 100 parts by mass of the liquid component. If the blending amount of (c) is less than 5 parts by mass, the color matching confirmation material will have too high a fluidity, resulting in poor operability and making it difficult to form a coating of the same thickness as dental cement during application. If the blending amount exceeds 13 parts by mass, the color matching confirmation material will have too low a fluidity, resulting in high discharge pressure and poor operability. Furthermore, cleanability with water rinsing will be poor.

[0030] In addition, it is preferable to use a combination of the fumed silica and spherical crosslinked PMMA having an average particle size of 10 to 50 μm, since this makes it easier to control the coating thickness. In this case, it is preferable to contain 0.05 to 1 part by mass of PMMA in 5 to 13 parts by mass of filler (c).

[0031] The amount of (c) blended is 5 to 13 parts by mass relative to 100 parts by mass of the liquid components, which consist of 38 to 62% by mass of (a) and 62 to 38% by mass of (b). Therefore, the proportions of each component in the total amount of components (a) to (c) in the dental color matching confirmation material of the present invention are (a) 33.6 to 59.0% by mass, (b) 33.6 to 59.0% by mass, and (c) 4.8 to 11.5% by mass.

[0032] (3) Pigment (d) The dental color matching confirmation material must have the same color tone as the corresponding dental cement (hardened product). Therefore, except for cases where the corresponding dental cement is untinted (clear shade) and the dental color matching confirmation material has the same color tone without being tinted, it is tinted to meet the above requirement by blending in a pigment (d). This point is the same for the color matching confirmation material of Reference 1 and the dental color matching confirmation material of the present invention.

[0033] Examples of pigments (d) that may be added as needed include red iron oxide, phthalocyanine blue, various azo pigments, and titanium dioxide. These pigments can be added alone or in combination. When pigment (d) is added, the amount added is usually 0.1 parts by mass or less based on the mass of the dental color matching confirmation material.

[0034] (4) Inorganic salts (e) In the dental color matching confirmation material of the present invention, the inorganic salt (e) has the function of suppressing evaporation of water (b) during storage and further reducing sagging. Any known inorganic salt (e) can be used without particular limitation as long as it has a solubility of 10 g or more in 100 g of water at 25°C. A higher solubility allows for a sufficient increase in the content of the inorganic salt in the dental color matching confirmation material of the present invention, thereby enhancing the effect of suppressing water evaporation, and therefore inorganic salts having a solubility of 20 g or more in 100 g of water at 25°C are particularly preferred.

[0035] Suitable inorganic salts (e) include inorganic salts consisting of a cation selected from sodium ions, potassium ions, magnesium ions, and barium ions and an anion selected from fluoride ions, chloride ions, and sulfate ions. Specific examples of suitable inorganic salts include sodium salts such as sodium chloride and sodium sulfate, potassium salts such as potassium fluoride and potassium chloride, magnesium salts such as magnesium chloride and magnesium sulfate, calcium salts such as calcium chloride, and barium salts such as barium chloride.

[0036] Among these, sodium chloride (solubility in 100 g of water at 25°C: 26.4 g), potassium chloride (solubility in 100 g of water at 25°C: g), potassium fluoride (solubility in 100 g of water at 25°C: 50.4 g), barium chloride (solubility in 100 g of water at 25°C: 27.1 g), calcium chloride (solubility in 100 g of water at 25°C: 45.3 g), and magnesium chloride (solubility in 100 g of water at 25°C: 35.5 g) are particularly suitable for use.

[0037] The amount of inorganic salt (e) in the dental color matching confirmation material of the present invention must be 3 to 13 parts by mass, preferably 5 to 10 parts by mass, per 100 parts by mass of the liquid component. If the amount of (e) is less than 3 parts by mass, the effect of suppressing water evaporation is insufficient. If the amount exceeds 13 parts by mass, the thixotropy of the color matching confirmation material increases excessively, or component (e) remains undissolved and behaves like a filler, increasing the discharge pressure and reducing operability. In particular, if the amount of inorganic salt added exceeds its solubility limit in water (b) contained in the paste that will become the dental color matching confirmation material, the inorganic salt will not completely dissolve in the liquid component during paste preparation, making it impossible to obtain a uniform paste.

[0038] Furthermore, according to the inventors' investigations, when component (e) is completely dissolved during paste preparation, even when water (b) is forcibly evaporated and the mixture is concentrated to a level exceeding the solubility limit of the remaining water, precipitation of inorganic salts is not observed as long as the amount of water evaporated is within a certain range. Although the detailed mechanism is unknown, it is presumed that this is because inorganic salts once dissolved during paste preparation can coexist in a stable state with component (a) by mixing the paste, and do not precipitate even if there is a certain amount of water shortage.

[0039] (5) Other ingredients If necessary, fluorescent agents, ultraviolet absorbers, antibacterial substances, etc. may be added to the dental color match confirming material of the present invention in amounts that do not impair the effects of the present invention.

[0040] (6) Preparation method The dental color match confirmation material of the present invention can be suitably prepared, for example, as follows. That is, it can be suitably prepared by mixing predetermined amounts of components (a), (b), and (e) to prepare a uniform solution, and then adding predetermined amounts of components (c) and (d) to disperse and form a paste. In this case, for example, a variable rotation / revolution mixer can be used as a dispersion method. Mixing can also be done using a mortar and pestle, or a mixer such as a planetary mixer. Furthermore, the mixing order can be such that components (a) and (b) are mixed to prepare a uniform solution, and then components (c), (d), and (e) are added and dispersed to form a paste.

[0041] 2. Kit of the Present Invention The dental color matching confirmation material of the present invention, like conventional dental color matching confirmation materials, is intended to be applied to a prosthesis in advance to temporarily try it on the abutment tooth and confirm its aesthetics, in order to select a dental cement that will provide an appropriate color after bonding when bonding a prosthesis to the abutment tooth. After color confirmation, like the color matching confirmation material in Reference 1, the prosthesis is removed, and the dental color matching confirmation material adhering to the inner surface of the prosthesis and the abutment tooth is removed with water.

[0042] In this case, the thickness of the coating of the dental color matching confirmation material applied to the upper surface of the abutment tooth is preferably about the same as the thickness of the coating formed using dental cement, i.e., 5 to 50 μm, and particularly 5 to 40 μm.

[0043] From the viewpoint of ease of use when forming such a coating on the upper surface of the abutment tooth, a kit is often used that holds a dental color match confirmation material in a syringe-type container, specifically, a single-syringe-type container that has a cylindrical barrel having a discharge port at its tip that is sealed with a removable cap, and a plunger having a gasket at its tip, and that can seal and hold a fluid in the fluid storage space formed in the barrel on the tip side of the gasket by slidably inserting the gasket from the rear end of the barrel.

[0044] The kit of the present invention is a kit that holds the dental shade matching confirmation material of the present invention in the fluid storage space, and when in use, the nozzle is attached to the discharge port whose cap has been removed, and the plunger is pushed into the barrel so that the dental shade matching confirmation material can be discharged from the nozzle. Note that the container can be any container that is used in conventional kits, without any particular restrictions.

[0045] The dental color tone matching confirmation material held inside the kit of the present invention is the dental color tone matching confirmation material of the present invention, and by using this material, even after long-term storage, it is possible to easily form a coating having the above-mentioned thickness that is easily removable by rinsing with water. [Example]

[0046] The present invention will be explained in more detail below with reference to examples, but the present invention is not limited to these examples.

[0047] 1. Raw materials First, the substances and abbreviations used as raw materials for each component when preparing the color match confirmation materials in the Examples and Comparative Examples will be explained.

[0048] <Polyhydric alcohol (a)> PEG200: Polyethylene glycol with a weight-average molecular weight of 200 PEG400: Polyethylene glycol with a weight-average molecular weight of 500 PEG35000: Polyethylene glycol with a weight-average molecular weight of 35,000 ·PEG50000: Polyethylene glycol with a weight average molecular weight of 50,000.

[0049] <Filling material (c)> HS1: Fumed silica with an average particle size of 0.012 μm HS2: Fumed silica with an average particle size of 0.024 μm PMMA1: 20μm spherical cross-linked polymethyl methacrylate PMMA2: 40μm spherical cross-linked polymethyl methacrylate.

[0050] The average particle size refers to the median size expressed on a volume basis, measured using a laser diffraction / scattering particle size distribution measuring device based on the Mie scattering theory.

[0051] <Inorganic salts (e)> NaCl: Sodium chloride (solubility 26.4g) ·Na2SO4: Sodium sulfate (solubility 21.9g) KCl: Potassium chloride (solubility 26.4g) MgSO4: Magnesium sulfate (solubility 26.7g) CaCl2: Calcium chloride (solubility 45.3g) <Inorganic salts other than (e) (e´)> NaF: Sodium fluoride (solubility 3.98g) CaSO4: Calcium sulfate (solubility 0.0016g) The above solubilities in (e) and (e') refer to the solubility in 100 g of water at 25°C.

[0052] 2. Experimental Method 2-1.Consistency evaluation The color matching confirmation materials prepared in the Examples and Comparative Examples were filled into 2.5 mL syringes (Terumo Syringe 2.5 mL, manufactured by Terumo Corporation), and three syringes were prepared with Esthelite Universal Flow (Tokuyama Dental Co., Ltd.) caps attached. The consistency of one syringe was measured before storage. The remaining two syringes were stored in an incubator at 50°C, and the consistency was measured after 50 days and 60 days of storage. The consistency was measured as follows. A polyethylene film was placed on an acrylic plate, and 0.1 g of sample was placed on top of it. Then, a film was immediately placed on top of the sample, and an acrylic plate with a weight attached was placed on top of that, and a load of 120 g was applied. The diameter of the sample was measured 10 seconds after the load was applied, and the average value of the diameters in two perpendicular directions was taken as the consistency. The acceptable consistency value was 16 mm or more. Based on the measurement results, the storage stability of the consistency was evaluated according to the following criteria. If the diameter of the paste after the load was applied exceeded 40 mm, measurement was not possible and the consistency was considered to be 40 mm or more. The evaluation criteria for storage stability are shown below. Poor storage stability: Consistency after 30 days of storage is below acceptable value. Good storage stability: The consistency after 30 days of storage is above the acceptable value, but the consistency after 40 days of storage is below the acceptable value. Particularly good storage stability: consistency after 40 days of storage is above the acceptable value.

[0053] 2-2. Evaluation of the feeling of impact The color matching confirmation materials prepared in the Examples and Comparative Examples were filled into a 2.5 mL syringe (Terumo Syringe 2.5 mL, manufactured by Terumo Corporation), and Tokuyama Plastic Tips (manufactured by Tokuyama Dental Co., Ltd.) were attached. The feeling of extrusion was evaluated according to the following criteria. ◎: Can be easily extruded. The amount extruded can also be easily controlled. ◯: There is a little more resistance than in the case of ◎, but it can be extruded without any problems. Alternatively, the fluidity of the paste is a little too high, but the amount extruded can be controlled. ×: It can be extruded but requires a large force, or it cannot be extruded at all, or the fluidity of the paste is too high and the amount extruded cannot be controlled.

[0054] 2-3. Evaluation of sagging A dental color matching confirmation material (approximately 0.1 g) was placed on a glass slide and left for 1 minute. During this time, a mark was made on the edge of the paste with a marker. The glass slide was then placed vertically with the mark facing downwards and allowed to stand in an incubator at 23°C. After 3 minutes, the distance traveled by the paste (movement distance), i.e., the length from the mark (initial value: 0 mm) to the bottom edge of the dental cement, was measured with a vernier caliper as "sagging / mm." From this value, sagging was evaluated as follows: If sagging exceeded 20 mm, the sagging value was deemed "20 mm or more" and the test was terminated. The evaluation criteria for sagging are shown below. Poor sagging: sagging exceeds 2 mm. Good sagging: sagging is more than 0.5 mm and 2 mm or less. Especially good sagging: sagging is 0.5 mm or less.

[0055] 2-4. Cleanability of dental color matching confirmation materials by rinsing with water 0.2 g of the prepared dental color matching confirmation material was applied to the surface of bovine dentin. Water was then applied perpendicularly to the surface of the bovine tooth at a pressure of 0.3 MPa and a flow rate of 120 mL / min, and the amount of remaining dental color matching confirmation material was visually observed. The number of seconds it took for the dental color matching confirmation material to be completely removed was taken as the value for water removability, and cleaning ability was evaluated according to the following criteria. ◎: Removal time is 3 to 4 seconds. ○: Removal time is 5 to 6 seconds. ×: Removal time is 7 seconds or more.

[0056] Example 1 5.35g of PEG200 was mixed with 0.15g of PEG35000 and 4.5g of water until completely dissolved. 0.05g of PMMA1, 1.0g of HS1, and 1g of NaCl were added and mixed using a Kurabo variable-rotation mixer called "Mazerustar." One set consisted of mixing for 5 minutes at 7 revolutions and 6 rotations, followed by mixing for 1 minute at 9 revolutions and 7 rotations. A total of two sets of mixing were performed to prepare one color matching confirmation material. The obtained color matching confirmation material was subjected to the above evaluations. The results are shown in Table 1. As shown in Table 1, the discharge feeling was rated as ⊚, and the consistency was 17.7 mm after 30 days of storage and 16.6 mm after 40 days of storage, both of which were within the allowable range. In addition, sagging was 0 mm, and cleanability was rated as ⊚. From these results, it was confirmed that the color matching confirmation material of Example 1 was excellent in all respects of discharge feeling, long-term storage stability, sagging, and cleanability.

[0057] Examples 2 to 13 Dental color matching confirmation materials were prepared and evaluated in the same manner, except that the types and amounts of ingredients were changed as shown in Table 1. The results are shown in Table 1. As shown in Table 1, in all Examples, the discharge feel, long-term storage stability, dripping, and cleanability were all good.

[0058] Comparative Examples 1 to 10 Dental color matching confirmation materials were prepared and evaluated in the same manner, except that the types and amounts of ingredients were changed as shown in Table 2. The results are shown in Table 2.

[0059] As shown in Table 2, when inorganic salt (e) was not contained, the paste viscosity was low and sagging exceeded the allowable value (Comparative Example 1). When the amount of filler (c) was increased to 11.5 parts by mass in a composition that did not contain inorganic salt (e), sagging became allowable, but the consistency after 30 days of storage was below the allowable value (Comparative Example 2).

[0060] Furthermore, when the content of inorganic salt (e) was less than 3 parts by mass relative to 100 parts by mass of the liquid component, the effect of suppressing the evaporation of water (b) was not sufficient, and the consistency after 30 days of storage was below the allowable value (Comparative Example 3). On the other hand, when the content of inorganic salt (e) exceeded 13 parts by mass relative to 100 parts by mass of the liquid component, the viscosity of the paste was high and it was impossible to discharge (Comparative Example 4). In this case, the paste could not be discharged, so it was impossible to evaluate the consistency and sagging.

[0061] Furthermore, when the inorganic salt contained had a solubility in 100 g of water at 25°C of less than 10 (e') or when the content of polyhydric alcohol (a) in the liquid component exceeded 62 mass% (when the water content was less than 38 mass%), the salt did not completely dissolve in the liquid component, and it was impossible to prepare a paste (Comparative Examples 5, 6, and 7). On the other hand, when the content of polyhydric alcohol (a) in the liquid component was less than 38 mass% (when the water content was more than 62 mass%), the water content in the color match confirmation material was high, so the paste weight loss due to water evaporation was significant, and the consistency after 30 days of storage was below the allowable value (Comparative Example 8). In this case, because the initial paste viscosity was low, sagging also exceeded the allowable value.

[0062] Furthermore, when the content of filler (c) exceeded 13 parts by mass, the paste viscosity was too high and it was impossible to discharge (Comparative Example 9). In this case, the paste could not be discharged, and therefore sagging could not be evaluated. On the other hand, when the content of filler (c) was less than 5 parts by mass, the paste viscosity was too low, resulting in a poor discharge feeling, and the sagging was so great that it exceeded 20 mm (Comparative Example 10).

[0063] [Table 1]

[0064] [Table 2]

Claims

1. A dental color matching confirmation material comprising a paste-like composition containing a polyhydric alcohol (a), water (b), and a filler (c), wherein the proportions of each component relative to the total amount of (a) to (c) are (a): 10 to 79% by mass, (b): 20 to 60% by mass, and (c): 1 to 30% by mass, and wherein a pigment (d) is blended as necessary to obtain a predetermined color tone, 38 to 62 mass % of the liquid component consisting of (a) and (b) is (a); The composition further contains an inorganic salt (e) having a solubility of 10 g or more in 100 g of water at 25°C, The contents of (c) and (e) relative to 100 parts by mass of the liquid component are (c): 5 to 13 parts by mass and (e): 3 to 13 parts by mass, respectively. A dental color matching confirmation material characterized by:

2. 2. The dental color matching confirmation material according to claim 1, wherein the inorganic salt (e) comprises a cation selected from sodium ions, potassium ions, magnesium ions, and barium ions, and an anion selected from fluoride ions, chloride ions, and sulfate ions.

3. 3. The dental color matching confirmation material according to claim 1, wherein the polyhydric alcohol (a) comprises polyethylene glycol.

4. a single-syringe type container having a cylindrical barrel with a discharge port at its tip that is sealed with a removable cap, and a plunger with a gasket at its tip, and capable of holding a fluid in a fluid storage space formed in the barrel on the tip side of the gasket by slidably inserting the gasket from the rear end of the barrel; The dental color matching confirmation material according to claim 1; A kit comprising: The dental color matching confirmation material is held in the fluid containing space of the container, and when in use, a nozzle is attached to the discharge port whose cap has been removed, and the plunger is pushed into the barrel, so that the dental color matching confirmation material can be discharged from the nozzle. A single syringe-fillable dental color matching confirmation material kit.

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