Base paste and dental alginate impression material

Abstract

To provide a main material paste having excellent storage stability.SOLUTION: A main material paste is used in a dental alginate impression material, comprising alginate, water, and a C3-8 carboxylate having 0 or more and 3 or less hydroxy groups.SELECTED DRAWING: None

Description

[Technical Field]

[0001] The present invention relates to a base paste used in a dental alginate impression material, and to a dental alginate impression material. [Background technology]

[0002] In dental treatment, alginate impression materials are widely used as impression materials for taking intraoral impressions when fabricating prostheses. Known alginate impression materials include a base paste containing alginate and water and a hardener paste containing a gelling agent and a poorly water-soluble liquid compound (see, for example, Patent Documents 1 and 2). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] International Publication No. 2012 / 063618 [Patent Document 2] International Publication No. 2014 / 050028 Summary of the Invention [Problem to be solved by the invention]

[0004] However, conventional alginate impression materials have problems with storage stability, such as deterioration of the base paste over storage time and a delay in the initial hardening time after use.

[0005] An object of the present invention is to provide a base paste having excellent storage stability. [Means for solving the problem]

[0006] A base paste according to one aspect of the present invention is a base paste used in a dental alginate impression material, and comprises alginate, water, a carboxylate having 0 to 3 hydroxy groups and 3 to 8 carbon atoms, and a condensed phosphate. In the main pasteThe carboxylate is at least one selected from the group consisting of sodium lactate, potassium lactate, sodium benzoate, potassium benzoate, sodium sorbate, and potassium sorbate. [Effects of the Invention]

[0007] According to one aspect of the present invention, a base paste having excellent storage stability can be provided. DETAILED DESCRIPTION OF THE INVENTION

[0008] Hereinafter, embodiments of the present invention will be described in detail.

[0009] [Main paste] The base paste of this embodiment is used in the dental alginate impression material of this embodiment, which will be described later.

[0010] In this specification, the dental alginate impression material is a dental preparation for taking an impression that utilizes the reaction between water-soluble alginate and gypsum to produce and harden insoluble calcium alginate, and the main paste is a paste-like material that constitutes the base material of the dental alginate impression material.

[0011] The base paste contains alginate, water, and a carboxylate having 0 to 3 hydroxy groups and 3 to 8 carbon atoms.

[0012] Examples of alginates include alkali metal salts of alginic acid such as sodium alginate and potassium alginate, and ammonium salts of alginic acid such as ammonium alginate and triethanolamine alginate. Among these, alkali metal salts of alginic acid are preferred, and potassium alginate is more preferred, from the viewpoints of availability, ease of handling, and the physical properties of the hardened body of the dental alginate impression material of the present embodiment, which will be described later.

[0013] The alginate may be used alone or in combination of two or more thereof.

[0014] Furthermore, the viscosity of a 1% by mass aqueous solution of alginate at 20°C is preferably 0.005 Pa·s or more and 0.5 Pa·s or less, and more preferably 0.1 Pa·s or more and 0.4 Pa·s or less. If the viscosity of a 1% by mass aqueous solution of alginate at 20°C is 0.005 Pa·s or more, the impression is less likely to break when a dental impression material using the base paste of this embodiment is used in combination with a conventional alginate impression material.

[0015] In addition, the viscosity of a 1% by mass aqueous solution of alginate at 20°C is 0.4 When the viscosity is Pa·s or less, the fluidity of the kneaded product of the base paste and the hardener paste is high, and when the base paste of this embodiment is used in combination with an alginate impression material, the accuracy of the impression is improved.

[0016] The content of alginate in the main paste is not particularly limited, and is, for example, 1% by mass or more and 20% by mass or less, preferably 3% by mass or more and 18% by mass or less, and more preferably 5% by mass or more and 15% by mass or less.

[0017] When the alginate content in the main paste is 1% by mass or more, the impression is less likely to be damaged when an alginate impression material (hereinafter sometimes referred to as a dental impression material) using the main paste of this embodiment is used in combination with a conventional alginate impression material, and when the alginate content is 20% by mass or less, the accuracy of the impression is improved when a dental impression material using the main paste of this embodiment is used in combination with a conventional alginate impression material.

[0018] As the water, for example, ion-exchanged water, distilled water, etc. can be used, and water that has been sterilized with sodium hypochlorite or the like can also be used.

[0019] The water content in the main paste is not particularly limited, and is, for example, 75% by mass or more and 99% by mass or less, preferably 80% by mass or more and 97% by mass or less, and more preferably 85% by mass or more and 95% by mass or less.

[0020] A carboxylate having 3 to 8 carbon atoms and 0 to 3 hydroxy groups (hereinafter sometimes referred to as a carboxylate) is a compound having no hydroxy groups or 1 to 3 hydroxy groups and at least one group in which the hydrogen of the carboxy group is substituted with a monovalent alkali metal.

[0021] Here, examples of the monovalent alkali metal that constitutes the carboxylate include sodium and potassium.

[0022] Examples of such carboxylates include saturated fatty acid salts such as propionate, butanoate, pentanoate, hexanoate, and octanoate; unsaturated fatty acid salts such as 2-butenoate, 4-pentenoate, 5-hexenoate, 5-octenoate, 2,3-butadienoate, 2,4-pentadienoate, 2,4-hexadienoate, 2,3-octadienoate, and 5,7-octadienoate; hydroxy acid salts such as lactate, hydroxybutyrate, and hydroxyvalerate; and aromatic carboxylates such as benzoate, hydroxybenzoate, phthalate, and terephthalate.

[0023] The carbon chains that make up these carboxylates can be straight or branched. chain That's fine too.

[0024] These carboxylates may be used alone or in combination of two or more.

[0025] Among these carboxylates, at least one selected from the group consisting of sodium lactate, potassium lactate, sodium benzoate, potassium benzoate, sodium sorbate, and potassium sorbate is preferred.

[0026] The content of carboxylate in the main paste is not particularly limited, and is, for example, 0.05% by mass or more and 10% by mass or less, preferably 0.08% by mass or more and 5% by mass or less, and more preferably 0.1% by mass or more and 2% by mass or less.

[0027] When the content of the carboxylate in the main material paste is 0.05% by mass or more, the storage stability of the main material paste can be improved, such that the main material paste is less likely to deteriorate over a storage period, and the initial hardening time when using the main material paste is not delayed, etc. When the content of the carboxylate in the main material paste is 10% by mass or less, the viscosity of the main material paste can be kept low while suppressing a decrease in the viscosity.

[0028] The viscosity of the base paste at 20°C is preferably 6 Pa·s or more and 60 Pa·s or less, and more preferably 8 Pa·s or more and 55 Pa·s or less. A viscosity of 6 Pa·s or more improves impression accuracy, and a viscosity of 60 Pa·s or less improves the strength of the hardened dental impression material.

[0029] Furthermore, the base paste of this embodiment has a lower viscosity than conventional paste-like alginate impression materials, and can be used in combined impression techniques.

[0030] The base paste may further contain a hardening retarder, etc. This increases the operation time of the dental impression material using the base paste of this embodiment.

[0031] Examples of the set retarder include phosphates such as trisodium phosphate and tripotassium phosphate, and condensed phosphates such as sodium pyrophosphate and potassium pyrophosphate. These set retarders may be used alone or in combination of two or more.

[0032] The content of the hardening retarder in the base paste is not particularly limited, and is, for example, 0.01 mass % or more and 10 mass % or less, preferably 0.05 mass % or more and 5 mass % or less, and more preferably 0.1 mass % or more and 3 mass % or less.

[0033] When the content of the set retarder in the main paste is 0.01% by mass or more, the operation time of the dental impression material using the main paste of this embodiment is extended. On the other hand, when the content of the set retarder in the main paste is 10% by mass or less, the initial set time of the dental impression material using the main paste of this embodiment is shortened, and the strength of the hardened dental impression material using the main paste of this embodiment is improved.

[0034] The base paste may contain other ingredients as long as they do not impair the object of the present invention. The other ingredients contained in the base paste may further include fillers, colorants, preservatives, disinfectants, fragrances, pH adjusters, surfactants, etc.

[0035] Examples of materials constituting the filler include clay minerals such as diatomaceous earth, talc, and smectite, and inorganic oxides such as silica and alumina. These fillers may be used alone or in combination of two or more.

[0036] Examples of surfactants include polyoxyethylene alkyl ethers, etc. These surfactants may be used alone or in combination of two or more.

[0037] The consistency of the base paste is not particularly limited, but is preferably 30 mm or more. When the consistency of the base paste is 30 mm or more, the fluidity of the kneaded product of the base paste and the hardener paste is increased. Therefore, when the dental impression material using the base paste of this embodiment is used in combination with a conventional alginate impression material, the accuracy of the impression is improved.

[0038] As described above, the main material paste of this embodiment contains alginate, water, and a carboxylate having 3 to 8 carbon atoms and having 0 to 3 hydroxy groups. This makes it possible to obtain a main material paste of this embodiment that is highly stable during storage, such as being resistant to deterioration over a storage period and not delaying the initial hardening time when used.

[0039] Furthermore, the base paste of this embodiment can be made to have a lower viscosity than conventional paste-like alginate impression materials, and can suppress a decrease in viscosity while maintaining the low viscosity. Therefore, the base paste of this embodiment can be used in the combined impression method (a method in which two uncured materials are layered together).

[0040] Furthermore, in the main material paste of this embodiment, as described above, at least one selected from the group consisting of sodium lactate, potassium lactate, sodium benzoate, potassium benzoate, sodium sorbate, and potassium sorbate is used as the carboxylate, which makes the main material paste less susceptible to further deterioration even after a storage period has elapsed and can suppress delay in the initial hardening time, thereby making it possible to obtain a main material paste with excellent storage stability.

[0041] [Dental alginate impression material] The dental alginate impression material of this embodiment includes a base paste and a hardener paste.

[0042] The main paste used in the dental alginate impression material of the present embodiment includes alginate, water, and a carboxylate having 0 to 3 hydroxy groups and 3 to 8 carbon atoms, as described above.

[0043] The content of alginate in the dental alginate impression material is not particularly limited, and may be, for example, 0.25 Mass% or more 15% by mass below and is preferably 2% by mass or more and 10% by mass or less, and more preferably 3% by mass or more and 8% by mass or less.

[0044] The content of alginate in the dental alginate impression material of this embodiment is 0.5When the alginate content in the dental alginate impression material of the present embodiment is 0.05 wt % or more, the impression is less likely to be broken when the dental alginate impression material of the present embodiment is used in combination with a conventional alginate impression material. 10 When the content is 0.05 wt % or less, the accuracy of the impression is improved when the dental alginate impression material of this embodiment is used in combination with a conventional alginate impression material.

[0045] The water content in the dental alginate impression material of this embodiment is not particularly limited, and is, for example, 40% by mass or more and 75% by mass or less, preferably 45% by mass or more and 70% by mass or less, and more preferably 50% by mass or more and 65% by mass or less.

[0046] The content of carboxylate in the dental alginate impression material of this embodiment is not particularly limited, and is, for example, 0.01% by mass or more and 7% by mass or less, preferably 0.03% by mass or more and 5% by mass or less, and more preferably 0.05% by mass or more and 1.5% by mass or less.

[0047] The content of carboxylate in the main paste is 0.05 When the content of the carboxylate in the main paste is 1% by mass or more, the main paste is less likely to deteriorate over a storage period, and the initial hardening time when the main paste is used is not delayed, thereby improving the storage stability of the main paste. 10 When the content is 0.05% by mass or less, it is possible to suppress the viscosity of the main paste low while also suppressing a decrease in the viscosity.

[0048] [Hardening paste] The hardener paste is mixed with the base paste to harden the dental alginate impression material.

[0049] The hardener paste contains a gelling agent and a poorly water-soluble liquid compound.

[0050] As the gelling agent, a compound of a divalent or higher metal can be used.

[0051] The compound of a divalent or higher valent metal is not particularly limited, and examples thereof include divalent or higher valent metals and their salts, oxides, hydroxides, etc. These may be used alone or in combination of two or more.

[0052] Examples of divalent or higher metals include calcium, magnesium, zinc, aluminum, iron, titanium, zirconium, and tin.

[0053] Examples of salts of divalent or higher metals include calcium sulfate dihydrate (CaSO4·2H2O), calcium sulfate hemihydrate (CaSO4·1 / 2H2O), and anhydrous calcium sulfate (CaSO4).

[0054] Examples of the oxides of divalent or higher metals include calcium oxide, magnesium oxide, zinc oxide, titanium oxide, zirconium oxide, and tin oxide.

[0055] Examples of the hydroxides of divalent or higher metals include calcium hydroxide, magnesium hydroxide, zinc hydroxide, aluminum hydroxide, and iron hydroxide.

[0056] The content of the gelling reactant in the hardener paste is not particularly limited, but is preferably 10% by mass or more and 60% by mass or less. When the content of the gelling reactant in the hardener paste is 10% by mass or more, the strength of the hardened body of the dental alginate impression material using the hardener paste is improved, and when it is 60% by mass or less, the operation time of the dental impression material is extended.

[0057] The poorly water-soluble liquid compound is not particularly limited as long as it can turn the gelling reactant into a paste, and examples thereof include hydrocarbon compounds, aliphatic alcohols, aromatic alcohols, fatty acids, fatty acid esters, silicone oils, etc. These may be used alone or in combination of two or more.

[0058] In this specification, poorly water-soluble means that the solubility in 100 g of water at 20°C is 5 g or less.

[0059] The hydrocarbon compound may be either a chain compound or a cyclic compound, and examples of the hydrocarbon compound include hexane, heptane, octane, nonane, decane, undecane, dodecane, tridecane, tetradecane, pentadecane, 2,7-dimethyloctane, 1-octene, cycloheptane, cyclononane, kerosene, and liquid paraffin.

[0060] The fatty alcohol may be either a saturated fatty alcohol or an unsaturated fatty alcohol, and examples of the fatty alcohol include 1-hexanol, 1-octanol, citronellol, and oleyl alcohol.

[0061] Examples of aromatic alcohols include benzyl alcohol and m-cresol.

[0062] The fatty acid may be either a saturated fatty acid or an unsaturated fatty acid.

[0063] Examples of fatty acids include hexanoic acid, octanoic acid, oleic acid, and linoleic acid.

[0064] The fatty acid ester may be either a saturated fatty acid ester or an unsaturated fatty acid ester.

[0065] Examples of fatty acid esters include ethyl octanoate, butyl phthalate, oleic acid glyceride, olive oil, sesame oil, cod liver oil, and whale oil.

[0066] Examples of silicone oils include polydimethylsiloxane, polymethylphenylsiloxane, polymethylhydrogensiloxane, and polyphenylhydrogensiloxane.

[0067] The content of the poorly water-soluble liquid compound in the hardener paste is preferably 10% by mass or more and 50% by mass or less, and more preferably 15% by mass or more and 30% by mass or less. When the content of the poorly water-soluble liquid compound in the hardener paste is 10% by mass or more, the operability of the dental alginate impression material of this embodiment using the hardener paste is improved, and when it is 50% by mass or less, the strength of the hardened product of the dental alginate impression material is improved.

[0068] The hardener paste preferably further contains polybutene, which improves the hardening property of the dental alginate impression material of this embodiment and extends the working time of the dental alginate impression material.

[0069] The polybutene is preferably liquid. The polybutene can be synthesized by copolymerizing isobutene and 1-butene. The number average molecular weight of the polybutene is preferably 300 to 4,000.

[0070] The polybutene content in the hardener paste is preferably 0.5% by mass or more and 30% by mass or less, and more preferably 1% by mass or more and 20% by mass or less. When the polybutene content in the hardener paste is 0.5% by mass or more and 30% by mass or less, the operability of the dental alginate impression material of this embodiment is improved.

[0071] The hardener paste preferably further contains a hardening retarder, which extends the working time of the dental alginate impression material of this embodiment.

[0072] Examples of the set retarder include phosphates such as trisodium phosphate and tripotassium phosphate, and condensed phosphates such as sodium pyrophosphate and potassium pyrophosphate. These set retarders may be used alone or in combination of two or more.

[0073] The content of the setter retarder in the hardener paste is preferably 0.01% by mass or more and 10% by mass or less. When the content of the setter retarder in the hardener paste is 0.01% by mass or more, the working time of the dental alginate impression material of this embodiment is extended, and when it is 10% by mass or less, the initial setting time of the dental alginate impression material is shortened, and the strength of the hardened product of the dental alginate impression material is improved.

[0074] The hardener paste may further contain a filler, a hardening adjuster, a surfactant, a colorant, a preservative, a disinfectant, a fragrance, a pH adjuster, and the like.

[0075] Examples of materials constituting the filler include clay minerals such as diatomaceous earth, talc, and smectite, and inorganic oxides such as silica and alumina. These fillers may be used alone or in combination of two or more.

[0076] Examples of the hardening regulator include potassium titanium fluoride, potassium silicofluoride, etc. These hardening regulators may be used alone or in combination of two or more.

[0077] Examples of surfactants include polyoxyethylene alkyl ethers, etc. These surfactants may be used alone or in combination of two or more.

[0078] The consistency of the hardener paste is not particularly limited, but is preferably 30 mm or more. When the consistency of the hardener paste is 30 mm or more, the fluidity of the kneaded product of the main material paste and the hardener paste is increased. Therefore, when the dental alginate impression material of this embodiment is used in combination with a conventional alginate impression material, the accuracy of the impression is improved.

[0079] [Method of using the dental impression material of this embodiment] The dental impression material of this embodiment is used by kneading the above-mentioned main material paste and hardener paste.

[0080] For example, a manual or electric extrusion device is used to extrude the main paste and the hardener paste filled in separate packaging containers, and the kneaded mixture is applied to teeth by passing through a nozzle.

[0081] Examples of packaging containers include molded resin or metal products, and resin or metal bags.

[0082] The mass ratio of the main paste to the hardener paste when mixing the main paste and the hardener paste is not particularly limited, and is, for example, 1-5, preferably 1-3, and more preferably 1-2.

[0083] As described above, the dental alginate impression material of this embodiment includes the base paste and hardener paste of this embodiment, thereby achieving the effects of the base paste of this embodiment. That is, in the dental alginate impression material of this embodiment, the base paste contained therein has high storage stability (is less likely to deteriorate over a storage period), so when the base paste is used, delay in the initial hardening time of the dental alginate impression material can be suppressed. Therefore, with the dental alginate impression material of this embodiment, impressions are less likely to be damaged, improving impression accuracy.

[0084] Furthermore, the main paste contained in the dental alginate impression material of this embodiment has a lower viscosity than conventional paste-like alginate impression materials, and furthermore, the viscosity is kept low and is prevented from decreasing, so that the dental alginate impression material of this embodiment can be used in the combined impression technique.

[0085] [Combined impression material] The dental alginate impression material of the present embodiment can be used as the combined impression material of the present embodiment. In this specification, the combined impression material is a material for making an impression by the combined impression method (a method in which two uncured materials are superimposed).

[0086] The combined impression material of this embodiment is used in combination with another alginate impression material. Specifically, after the other alginate impression material is applied to an object to be taken an impression of, for example, a tooth, the combined impression material of this embodiment is then applied to the object.

[0087] The other alginate impression material is not particularly limited, but for example, an alginate impression material used in the agar-alginate combined impression technique can be used.

[0088] Other alginate impression materials may be of powder type or of paste type having a base paste containing alginate and water, a gelling reactant, and a hardener paste containing a poorly water-soluble liquid compound.

[0089] The mass ratio of the combined impression material of this embodiment to the other alginate impression material is not particularly limited.

[0090] When a paste-type alginate impression material is used as another alginate impression material, the alginate impression material is the same as the dental alginate impression material of this embodiment, except that the consistency of the kneaded product of the main material paste and the hardener paste is less than 36 mm.

[0091] As described above, the combined impression material of this embodiment can achieve the same effects as the dental alginate impression material of this embodiment by using the dental alginate impression material of this embodiment. That is, in the combined impression material of this embodiment, the main material paste contained therein has high storage stability (it is less likely to deteriorate even after a storage period has elapsed), so when the main material paste is used, delay in the initial setting time of the dental alginate impression material can be suppressed, and the resulting impression is less likely to be damaged.

[0092] Furthermore, in the combined impression material of this embodiment, the main paste contained in the dental alginate impression material has a lower viscosity than conventional paste-like alginate impression materials, and furthermore, the viscosity is kept low and a decrease in viscosity is suppressed. As a result, the combined impression material of this embodiment can improve the accuracy of impressions made using the combined impression method. [Example]

[0093] The present invention will be further described below using examples. In the following, numbers without units, "parts" or "%" are by mass unless otherwise specified. The examples and comparative examples were evaluated by the following tests.

[0094] <Preparation of hardener paste> A hardener paste was obtained by mixing 45 parts of calcium sulfate, 23 parts of liquid paraffin, 12.5 parts of silica, 6 parts of magnesium hydroxide, 4 parts of polybutene, 3 parts of potassium titanium fluoride, 3 parts of polyoxyethylene alkyl ether, 2 parts of zinc oxide, and 1.5 parts of tripotassium phosphate. The composition of the hardener paste is shown in Table 1.

[0095] [Table 1]

[0096] <Preparation of main material paste> A base paste was obtained by mixing 8 parts of potassium alginate, a carboxylic acid salt with 3 to 8 carbon atoms and 0 to 3 hydroxy groups, and 0.2 parts of potassium pyrophosphate as a set retarder, and adding distilled water to make the total 100 parts. The viscosity of a 1% by mass aqueous solution of potassium alginate used at 20°C was 144 mPa·s.

[0097] <Storability (viscosity)> Before storing the main paste, and in an environment of 60°C and 100% relative humidity 1 After storing for a week, the viscosity was measured using an E-type viscometer (RE-85, manufactured by Toki Sangyo Co., Ltd.) at a cone angle of 3 degrees, a shear rate of 5 (1 / sec) (rotation speed 10 rpm), and a temperature of 20°C to confirm the storage stability of the main paste. The storage stability was evaluated according to the following criteria.

[0098] [Evaluation criteria] Good: 10 Pa·s or more and less than 50 Pa·s Not allowed: Less than 10 Pa·s or more than 50 Pa·s

[0099] <Initial curing time> Before storing the main paste, and in an environment of 60°C and 100% relative humidity 1 After storing for 1 week, the base paste and hardener paste were mixed in a mass ratio of 2:1, and the initial setting time of the dental alginate impression material was measured according to 7.2 Initial setting time of JIS T 6505 Dental alginate impression material. The initial setting time was evaluated according to the following criteria.

[0100] [Evaluation criteria] Good: 50s to 120s Not allowed: Less than 50s or more than 120s

[0101] <Compression strength> Before storing the base paste, and after storing it for one week in an environment of 60°C and 100% relative humidity, the base paste and hardener paste were mixed in a mass ratio of 2:1, and a hardened body was produced in a thermostatic water bath at 35°C. The compressive strength was evaluated by measuring the hardened body at a crosshead speed of 100±20 N / min using an autograph (Shimadzu Corporation, EZ-20) until it broke. The compressive strength was evaluated according to the following criteria.

[0102] [Evaluation criteria] Excellent: 0.50MPa or more Good: 0.35 MPa or more and less than 0.50 MPa Not allowed: Less than 0.35 MPa

[0103] Examples and comparative examples will be described below.

[0104] [Example 1] Base paste containing 1 part sodium benzoate as carboxylate Prepare The composition of Example 1 and the evaluation results are shown in Table 2.

[0105] [Example 2] The main paste was prepared in the same manner as in Example 1, except that the amount of sodium benzoate was 0.1 parts. Made The composition and evaluation results of Example 2 are shown in Table 2.

[0106] [Example 3] The main paste was prepared in the same manner as in Example 1, except that 1 part of sodium lactate was used instead of sodium benzoate. Made The composition and evaluation results of Example 3 are shown in Table 2.

[0107] [Example 4] The main paste was prepared in the same manner as in Example 1, except that 0.3 parts of potassium sorbate was used instead of sodium benzoate. Made The composition and evaluation results of Example 4 are shown in Table 2.

[0108] [Example 5] The main paste was prepared in the same manner as in Example 1, except that 1 part of sodium lactate was added. Made The composition and evaluation results of Example 5 are shown in Table 2.

[0109] [Comparative Example 1] The main paste was prepared in the same manner as in Example 1, except that no carboxylate was added. Made The composition of Comparative Example 1 and the evaluation results are shown in Table 2.

[0110] [Table 2]

[0111] As shown in Table 2, dental alginate impression materials using a base paste containing alginate, water, and a carboxylic acid salt having 3 to 8 carbon atoms and 0 to 3 hydroxy groups had good storage stability, initial hardening time, and compressive strength (Examples 1 to 5).

[0112] In contrast, A compound having 3 to 8 carbon atoms and 0 to 3 hydroxy groups Contains carboxylates do not Dental alginate impression materials using the main paste were stored at 60°C for one week, and all of the storage stability, initial hardening time, and compressive strength were stable. later The results were poor (Comparative Example 1).

[0113] Although the embodiments of the present invention have been described above, the present invention is not limited to the specific embodiments, and various modifications and changes are possible within the scope of the invention described in the claims.

Claims

1. A base paste used in dental alginate impression materials, The main material paste contains alginate, water, a carboxylate having 0 to 3 hydroxy groups and 3 to 8 carbon atoms, and a condensed phosphate, The carboxylate is at least one selected from the group consisting of sodium lactate, potassium lactate, sodium benzoate, potassium benzoate, sodium sorbate, and potassium sorbate. Main material paste.

2. The base material paste according to claim 1; A hardener paste containing a gelling agent and a poorly water-soluble liquid compound. Dental alginate impression material.

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