Alginate dental impression material

Abstract

A dental alginate impression material according to one aspect of the present invention contains an alginate, calcium sulfate, and an aminocarboxylic acid.

Description

[0001] This application is a divisional application of application No. 201680083736.7 filed on December 1, 2016, the title of which is "Alginate impression material for dental use". TECHNICAL FIELD

[0002] The present application relates to an alginate impression material for dental use. BACKGROUND

[0003] In dentistry, when a prosthesis is made, a method of taking an impression in the oral cavity, a combined alginate / agar impression method is widely used. The agar impression material is mainly used together with the alginate impression material in a one-time impression method in which the two impression materials are combined. Specifically, after the agar impression material in a molten and low viscosity state is injected into a portion where a cavity is formed in the oral cavity, a tray in which the alginate impression material in a high viscosity state is previously placed is pressure-bonded, whereby an impression can be obtained.

[0004] However, the agar impression material is a heat-reversible gel, and there is a problem that the initial hardening time is short and the operation time is also short.

[0005] On the other hand, the alginate impression material has a powder-liquid type and a two-paste type (for example, refer to Patent Documents 1 to 5).

[0006] [Related Art Documents]

[0007] [Patent Documents]

[0008] [Patent Document 1] Japanese Patent Application Laid-Open No. 2006-273720

[0009] [Patent Document 2] Japanese Patent Application Laid-Open No. 2002-87922

[0010] [Patent Document 3] Japanese Patent Application Laid-Open No. 2004-269385

[0011] [Patent Document 4] Japanese Patent Application Laid-Open No. 2013-95655

[0012] [Patent Document 5] Japanese Patent Application Laid-Open No. 2012-153633 SUMMARY

[0013] [Problems to be Solved by the Invention]

[0014] However, there is a demand for improving the storage stability.

[0015] Thus, one aspect of the present application provides a dental alginate impression material having a long working time and high storage stability.

[0016] [Means for solving the problem]

[0017] In one aspect of the present application, a dental alginate impression material contains an alginate, calcium sulfate, and an amino carboxylic acid.

[0018] [Effects of the invention]

[0019] According to one aspect of the present application, a dental alginate impression material having a long working time and high storage stability can be provided. DETAILED DESCRIPTION

[0020] Hereinafter, a mode for carrying out the present application will be described.

[0021] The dental alginate impression material contains an alginate, calcium sulfate, and an amino carboxylic acid. Thereby, the storage stability can be improved. The reason can be considered to be that the decrease in the molecular weight of the alginate with time can be inhibited.

[0022] As the alginate, there is no particular limitation as long as it is water-soluble, but sodium alginate, potassium alginate, ammonium alginate, triethanolammonium alginate, and the like can be exemplified, and two or more kinds thereof can be used at the same time.

[0023] As the calcium sulfate, there is no particular limitation, but calcium sulfate anhydrous, calcium sulfate a hemihydrate, calcium sulfate β hemihydrate, calcium sulfate dihydrate, and the like can be exemplified, and two or more kinds thereof can be used at the same time. Among them, from the viewpoint of the compression strength of the hardened product, calcium sulfate a hemihydrate is preferable.

[0024] As the amino carboxylic acid, there is no particular limitation, but an amino carboxylic acid, a metal salt of an amino carboxylic acid, and the like can be exemplified, and two or more kinds thereof can be used at the same time.

[0025] Amino carboxylic acids include amino monocarboxylic acids and complexan (amino polycarboxylic acids).

[0026] As the amino monocarboxylic acid, for example, N, N-bis (2-hydroxyethyl) glycine (DHEG), N, N-bis (phosphonomethyl) glycine, and the like can be exemplified.

[0027] As the complexing agent, for example, amino diacetic acid (IDA), N-methyliminodiacetic acid (MIDA), N-cyclohexyliminodiacetic acid, uramil-N,N-diacetic acid, N-phenyldiacetic acid, benzylamino-N,N-diacetic acid, N-(2-furylmethyl)iminodiacetic acid, N-(2-tetrahydropyranylmethyl)iminodiacetic acid, 2-aminomethylpyridine-N,N-diacetic acid, N-(2-methoxyethyl)iminodiacetic acid, N-(2-methylthioethyl)iminodiacetic acid, N-2-hydroxyethyliminodiacetic acid, N-(3-hydroxypropyl)iminodiacetic acid, N-(2-hydrocyclohexyl)iminodiacetic acid, N-(o-hydroxyphenyl)iminodiacetic acid, o-hydroxybenzylamine-N,N-diacetic acid, N-(2-hydroxyethyl)ethylenediamine-N,N,N',N'-tetraacetic acid, N-(2-hydroxyethyl)ethylenediamine-N,N,N',N'-tetraacetic acid, N-(2-hydroxyethyl)ethylenediamine-N,N,N',N'-tetraacetic acid, N-(2-hydroxyethyl)ethylenediamine-N,N,N',N'-tetraacetic acid, N-(2-hydroxyethyl)ethylenediamine-N,N,N',N'-tetraacetic acid, N-(2-hydroxyethyl)ethylenediamine-N,N,N',N'-tetraacetic acid, N-(2-hydroxyethyl)ethylenediamine-N,N,N',N'-tetraacetic acid, N-(2-hydroxyethyl)ethylenediamine-N,N,N',N'-tetraacetic acid, N-(2-hydroxyethyl)ethylenediamine-N,N,N',N'-tetraacetic acid, N-(2-hydroxyethyl)ethylenediamine-N,N,N',N'-tetraacetic acid, N-(2-hydroxyethyl)ethylenediamine-N,N,N',N'-tetraacetic acid, N-(2-hydroxyethyl)ethylenediamine-N,N,N',N'-tetraacetic acid, N-(2-hydroxyethyl)ethylenediamine-N,N,N',N'-tetraacetic acid, N-(2-hydroxyethyl)ethylenediamine-N,N,N',N'-tetraacetic acid, N-(2-hydroxyethyl)ethylenediamine-N,N,N',N'-tetraacetic acid, N-(2-hydroxyethyl)ethylenediamine-N,N,N',N'-tetraacetic acid, N-(2-hydroxyethyl)ethylenediamine-N,N,N',N'-tetraacetic acid, N-(2-hydroxyethyl)ethylenediamine-N,N,N',N'-tetraacetic acid, N-(2-hydroxyethyl)ethylenediamine-N,N,N',N'-tetraacetic acid, N-(2-hydroxyethyl)ethylenediamine-N,N,N',N'-tetraacetic acid, N-(2-hydroxyethyl)ethylenediamine-N,N,N',N'-tetraacetic acid, N-(2-hydroxyethyl)ethylenediamine-N,N,N',N'-tetraacetic acid, N-(2-hydroxyethyl)ethylenediamine-N,N,N',N'-tetraacetic acid, N-(2-hydroxyethyl)ethylenediamine-N,N,N',N'-tetraacetic acid, N-(2-hydroxyethyl)ethylenediamine-N,N,N',N'-tetraacetic acid, N-(2-hydroxyethyl)ethylenediamine-N,N,N',N'-tetraacetic acid, N-(2-hydroxyethyl)ethylenediamine-N,N,N',N'-tetraacetic acid, NN-diacetic acid), N-2-mercaptoethyliminodiacetic acid, N-(o- mercaptophenyl)iminodiacetic acid, N-cyanomethyliminodiacetic acid, N-(2- aminoethyl)iminodiacetic acid, ethylenediamine-N,N-diacetic acid, N- (carbamoylmethyl)iminodiacetic acid, ((acetamido)iminodiacetic acid), aminoacetone-N,N-diacetic acid, 1 -aminopropan-2-one-N,N-diacetic acid, ω- aminoacetophenone-N,N-diacetic acid, N-(o-carboxyphenyl)iminodiacetic acid, nitrilotriacetic acid (NTA), nitrilodiacetic acid methylenesulfonic acid, N- phosphonomethyliminodiacetic acid, nitriloacetic acid-di(methylenesulfonic acid), ethylenediamine-N,N'-diacetic acid (EDDA), ethylenediamine-N,N'-di-α- propionic acid, ethylenediamine-N,N'-di-C-methylacetic acid, ethylenediamine- N,N'-dipropionic acid, diethylenetriamine-N,N',N"-triacetic acid (DTPA), N- hydroxyethylenediamine-N,N',N"-triacetic acid (HODTPA), N-methyliminodiacetic acid, N-(2-hydroxyethyl)iminodiacetic acid, N-(2-sulfonatoethyl)iminodiacetic acid, N-(2,3-dicarboxypropyl)iminodiacetic acid, N-(tetracarboxypropyl)iminodiacetic acid, N-(2- carboxyethyl)iminodiacetic acid, N-(2-phosphonooethyl)iminodiacetic acid, N- (2-phosphonomethyl)iminodiacetic acid, N-(2-aminopropyl)iminodiacetic acid, N-(2- hydroxyethyl)ethylenediamine-N,N',N"-triacetic acid, N-(2-hydroxypropyl)ethylenediamine- N,N',N"-triacetic acid, N-(2-hydroxyethyl)-1,3-propanediamine-N,N',N"-triacetic acid, N- (2-hydroxyethyl)diethylenetriamine-N,N',N"-triacetic acid, N-(2- hydroxyethyl)tris(aminomethanolsulfonic acid), N-(2-hydroxyethyl)ethylenediamine- N,N'-diacetic acid, N-(2-hydroxyethyl)ethylenediamine-N,N'-di-α-propionic acid, N-(2-hydroxyethyl)ethylenediamine-N,N'-di-C-methylacetic acid, N-(2- hydroxyethyl)ethylenediamine-N,N'-dipropionic acid, N-(2-hydroxyethyl)ethylenediamine- N,N',N"-tetraacetic acid (EDTA), N-(2-hydroxypropyl)ethylenediamine-N,N'- diacetic acid, N-(2-hydroxypropyl)ethylenediamine-N,N'-di-α-propionic acid, N- (2-hydroxypropyl)ethylenediamine-N,N'-di-C-methylacetic acid, N-(2-N'-dipropionic acid (EDDP), N,N-ethylenebis(α-o-hydroxyphenyl)glycine (EHPG), N,N'-bis(2-hydroxybenzyl)ethylenediamine-N,N'-diacetic acid, ethylene dinitrilo-N,N'-bis(2-hydroxybenzyl)-N,N'-diacetic acid, N,N'-ethylenebis(2-aminomethylpyridine)-N,N'-diacetic acid (acids mentioned include:) ethylenediamine-N,N'-bis(2'-pyridinemethyl)-N,N'-diacetic acid, ethylenediamine-N,N'-diacetic acid-N,N'-diacetohydroxamic acid (EDTA-DX), N-butylethylenediamine-N,N',N'-triacetic acid, N-cyclohexylethylenediamine-N,N',N'-triacetic acid, and N-octylethylenediamine-N,N',N'-triacetic acid. N-eicosyl ethylenediamine-N,N',N'-triacetic acid, N-benzyl ethylenediamine-N,N',N'-triacetic acid, N-hydroxyethyl ethylenediamine-N,N',N'-triacetic acid (HEDTA), ethylenediamine-N,N,N',N'-tetraacetic acid (EDTA), 1,2-propylenediamine-N,N,N',N'-tetraacetic acid, 1,2-diaminopropyn-N,N,N',N'-tetraacetic acid (C-MeEDTA), d,l-2,3-diaminobutane-N,N,N',N'-tetraacetic acid (d,l-DIMEDTA), meso-2,3-diaminobutane-N,N,N',N'-tetraacetic acid (meso-DIMEDTA), 1-phenylethylenediamine-N,N,N',N'-tetraacetic acid (C-PhEDTA), d,l-1,2-diphenylethylenediamine-N,N,N',N'-tetraacetic acid (d,l-DPEDTA), 1,3-diaminopropane-N,N,N',N'-tetraacetic acid, 1,4-diaminobutane-N,N,N',N'-tetraacetic acid, tetramethylenediamine tetraacetic acid (TETA), 1,5-diaminopentane-N,N,N',N'-tetraacetic acid, 1,6-diaminohexane-N,N,N',N'-tetraacetic acid, 1,8-diaminooctane-N,N,N',N'-tetraacetic acid, trans-cyclobutane-1,2-diamine-N,N,N',N'-tetraacetic acid) (CBDTA), trans-cyclopentane-1,2-diamine-N,N,N',N'- tetraacetic acid (trans-CPDTA), trans-cyclohexane-1,2-diamine-N,N,N',N'-tetraacetic acid (trans- CyDTA), cis-cyclohexane-1,2-diamine-N,N,N',N'-tetraacetic acid (cis-CyDTA), cyclohexane-1,3- diamine-N,N,N',N'-tetraacetic acid (1,3-CyDTA), cyclohexane-1,4-diamine-N,N,N',N'-tetraacetic acid (1,4-CyDTA), o-phenylenediamine-N,N,N',N'-tetraacetic acid (o-PDTA), cis-1,4- diaminobutene-N,N,N',N'-tetraacetic acid (cis-BDTA), trans-1,4-diaminobutene-N,N,N',N'- tetraacetic acid (trans-BDTA), a,a'-diamino-o-xylene-N,N,N',N'-tetraacetic acid (o-XyDTA), 2- hydroxy-1,3-propanediamine-N,N,N',N'-tetraacetic acid (HPDTA), 2,2'-oxybis(ethyliminodiacetic acid)), ethyl ether diamine-N,N,N',N'-tetraacetic acid (EEDTA), 2,2'-ethylenedioxybis(ethyliminodiacetic acid), glycol ether diamine-N,N,N',N'-tetraacetic acid (GEDTA), 3,3'-oxybis(propyliminodiacetic acid), propyl ether diamine-N,N,N',N'-tetraacetic acid, 2,2'-thiobis(ethyliminodiacetic acid), ethylthioether diamine-N,N,N',N'-tetraacetic acid, 2,2'-ethylenebisthio(ethyliminodiacetic acid), glycol thioether diamine-N,N,N',N'-tetraacetic acid, N,N'-glycyl ethylenediamine-N",N",N"',N'" -tetraacetic acid, ethylenediamine-N,N'-diacetic acid-N,N'-di-α-propionic acid (EDDADP), ethylenediamine-N,N'-diacetic acid-N,N'-di-β-propionic acid (EDPA), ethylenediamine-N,N,N',N'-tetrapropionic acid (EDTP), ethylenediamine-N,N,N',N'-tetraacetic acid (EDTA), ethylenediamine-N,N'-diacetic acid (EDDA), ethylenediamine-N,N'-di(2-hydroxy-1 -naphthoic acid) (EDDHA), ethylenediamine-N,N'-di(2-hydroxy-4-methoxy-1 -naphthoic acid) (EDDM), ethylenediamine-N,N'-di(2-hydroxy-4-methoxy-1 -naphthoic acid) (EDDM), ethylenediamine-N,N'-di(2-hydroxy-4-methoxy-1 -naphthoic acid) (EDDM), ethylenediamine-N,N'-di(2-hydroxy-4-methoxy-1 -naphthoic acid) (EDDM), ethylenediamine-N,N'-di(2-hydroxy-4-methoxy-1 -naphthoic acid) (EDDM), ethylenediamine-N,N'-di(2-hydroxy-4-methoxy-1 -naphthoic acid) (EDDM), ethylenediamine-N,N'-di(2-hydroxy-4-methoxy-1 -naphthoic acid) (EDDM), ethylenediamine-N,N'-di(2-hydroxy-4-methoxy-1 -naphthoic acid) (EDDM), ethylenediamine-N,N'-di(2-hydroxy-4-methoxy-1 -naphthoic acid) (EDDM), ethylenediamine-N,N'-di(2-hydroxy-4-methoxy-1 -naphthoic acid) (EDDM), ethylenediamine-N,N'-di(2-hydroxy-4-methoxy-1 -naphthoic acid) (EDDM), ethylenediamine-N,N'-di(2-hydroxy-4-methoxy-1 -naphthoic acid) (EDDM), ethylenediamine-N,N'-di(2-hydroxy-4-methoxy-1 -naphthoic acid) (EDDM), ethylenediamine-N,N'-di(2-hydroxy-4-methoxy-1 -naphthoic acid) (EDDM), ethylenediamine-N,N'-di(2-hydroxy-4-methoxy-1 -naphthoic acid) (EDDM), ethylenediamine-N,N'-di(2-hydroxy-4-methoxy-1 -naphthoic acid) (EDDM), ethylenediamine-N,N'-di(2-hydroxy-4-methoxy-1 -naphthoic acid) (EDDM), ethylenediamine-N,N'-di(2-hydroxy-4-methoxy-1 -naphthoic acid) (EDDM), ethylenediamine-N,N'-di(2-hydroxy-4-methoxy-1 -naphthoic acid) (EDDM), ethylenediamine-N,N'-di(2-hydroxy-4-methoxy-1 -naphthoic acid) (EDDM), ethylenediamine-N,N'-di(2-hydroxy-4-methoxy-1 -naphthoic acid) (EDDM), ethylenediamine-N,N'-di(2-hydroxy-4-methoxy-1 -naphthoic acid) (EDDM), ethylenediamine-N,N'-di(2-hydroxy-4-methoxy-1 -naphthoic acid) (EDDM), ethylenediamine-N,N'-di(2-hydroxy-4-methoxy-1 -naphthoic acid) (EDDM), ethylenediamine-N,N'-di(2-hydroxy-4-methoxy-1 -naphthoic acid) (EDDM), ethylenediamine-N,N'-di(2-hydroxy-4-methoxy-1 -naphthoic acid) (EDDM), ethylenediamine-N,N'-di(2-hydroxy-4-methoxy-1 -naphthoic acid) (EDDM), ethylenediamine-N,N'-di(2-hydroxy-4-methoxy-1 -naphthoic acid) (EDDM), ethylenediamine-N,N'-di(2-hydroxy-4-methoxy-1 -naphthoic acid) (EDDM), ethylenediamine-N,N'-di(2-hydroxy-4-methoxy-1 -naphthoic acid) (EDDM), ethylenediamine-N,N'-di(2-hydroxy-4-methoxy-1 -naphthoic acid) (EDDM), ethylenediamine-N,N'-di(2-hydroxy-4-methoxy-1 -naphthoic acid) (EDDM), ethylenediamine-N,N'-di(2-hydroxy-4-methoxy-1 -naphthoic acid) (EDDM), ethylenediamine-N,N'-di(2-hydroxy-4-methoxy-1 -naphthoic acid) (EDDM), ethylenediamine-N,N'-di(2-hydroxy-4-methoxy-1 -naphthoic acid) (EDDM), ethylenediamine-N,N'-di(2-hydroxy-4-methoxy-1 -naphthoic acid) (EDDM), ethylenediamine-N,N'-di(2-hydroxy-4-methoxy-1 -naphthoic acid) (EDDM), ethylenediamine-N,N'-di(2-hydroxy-4-methoxy-1 -naphthoic acid) (EDDM), ethylenediamine-N,N'-di(2-hydroxy-4-methoxy-1 -naphthoic acid) (EDDM), ethylenediamine-N,N'-di(2-hydroxy-4-methoxy-1 -naphthoic acid) (EDDM), ethylenediamine-N,N'-di(2-hydroxy-4-methoxy-1 -naphthoic acid) (EDDM), ethylenediamine-N,N'-di(2-hydroxy-4-methoxy-1 -naphthoic acid) (EDDM), ethylenediamine-N,N'-di(2-hydroxy-4-methoxy-1 -naphthoic acid) (EDDM), ethylenediamine-N,N'-di(2-hydroxy-4-methoxy-1 -naphthoic acid) (EDDM), ethylenediamine-N,N'-di(2-hydroxy-4-methoxy-1 -naphthoic acid) (EDDM), ethylenediamine-N,N'-di(2-hydroxy-4-methoxy-1 -naphthoic acid) (EDDM), ethylenediamine-N,N'-di(2-hydroxy-4-methoxy-1 -naphthoic acid) (EDDM), ethylenediamine-N,N'-di(2-hydroxy-4-methoxy-1 -naphthoic acid) (EDDM), ethylenediamine-N,N'-di(2-hydroxy-4-methoxy-1 -naphthoic acid) (EDDM), ethylenediamine-N,N'-di(2-hydroxy-4-methoxy-1 -naphthoic acid) (EDDM), ethylenediamethylenediamine-N, N'-bis(acetylglycine)-N, N'-diacetic acid, ethylenediamine-N, N'-diacetic acid-N, N'-bis(methylenephosphonic acid), diethylenetriamine-N, N, N', N", N"-pentaacetic acid (DTPA), triethylenetetramine-N, N, N', N", N"', N"' -hexaacetic acid (TTHA), 1, 2, 3-triaminopropane-N, N, N', N', N", N"-hexa-acetic acid (TAPHA), and the like.

[0028] Among the above-mentioned aminocarboxylic acids, from the viewpoint of price and / or easiness of availability as an aminocarboxylic acid for a dental alginate impression material, N, N-bis(2-hydroxyethyl)glycine (DHEG), ethylenediamine-N, N, N', N'-tetraacetic acid (EDTA), diethylenetriamine-N, N, N', N", N"-pentaacetic acid (DTPA), trans-cyclohexane-1, 2-diamine-N, N, N', N'-tetraacetic acid (trans-CyDTA), cis-cyclohexane-1, 2-diamine-N, N, N', N'-tetraacetic acid (cis-CyDTA), cyclohexane-1, 3-diamine-N, N, N', N'-tetraacetic acid (1, 3-CyDTA), cyclohexane-1, 4-diamine-N, N, N', N'-tetraacetic acid (1, 4-CyDTA), N-hydroxyethyl ethylenediamine-N, N', N'-triacetic acid (HEDTA), triethylenetetramine-N, N, N', N", N"', N"' -hexaacetic acid (TTHA), glycol ether diamine-N, N, N', N'-tetraacetic acid (GEDTA) are preferable.

[0029] The aminocarboxylic acid is preferably water-soluble.

[0030] As the aminocarboxylic acid having water-solubility, for example, a metal salt of an aminocarboxylic acid can be exemplified.

[0031] As the metal salt, for example, basic metal salts such as sodium salts, lithium salts, potassium salts, and the like can be exemplified.

[0032] The dental alginate impression material can be either one of 1-material type and 2-material type, but from the viewpoint of accuracy of the impression, the 2-material type is preferred.

[0033] [2-material type]

[0034] The dental alginate impression material has a main material containing alginate, aminocarboxylic acid, and water, and a hardening material containing calcium sulfate and a non-aqueous dispersion medium.

[0035] [Main material]

[0036] The content of the alginate in the main material is generally 3 to 10 mass%, and preferably 5 to 8 mass%. By the content of the alginate in the main material being 3 mass% or more, the compression strength of the hardened product can be increased, and by being 10 mass% or less, the accuracy of the impression can be increased.

[0037] The content of the aminocarboxylic acid in the main material is generally 0.01 to 2 mass%, and preferably 0.05 to 0.5 mass%. By the content of the aminocarboxylic acid in the main material being 0.01 mass% or more, the storage stability of the dental alginate impression material can be increased, and by being 2 mass% or less, the compression strength of the hardened product can be increased.

[0038] The viscosity at 23°C of the main material is generally 4 to 40 Pa-s, and preferably 5 to 35 Pa-s. By the viscosity at 23°C of the main material being 4 Pa-s or more, the compression strength of the hardened product can be increased, and by being 40 Pa-s or less, the accuracy of the impression can be increased.

[0039] The main material preferably further contains a hardening retardant. By this, the operation time can be controlled.

[0040] As the hardening retardant, there is no particular limitation, but sodium pyrophosphate and the like can be exemplified.

[0041] The main material can further contain a nonionic surfactant and the like.

[0042] As the nonionic surfactant, there is no particular limitation, but polyoxyalkylene alkyl ether and the like can be exemplified.

[0043] [Hardening material]

[0044] As the non-aqueous dispersion medium, there is no particular limitation as long as it does not react with calcium sulfate, but carbon hydrides such as decane, undecane, dodecane, tetradecane, kerosene, 1-octene, cycloheptane, cyclononane, liquid paraffin, polybutene, and the like, aliphatic alcohols such as 1-hexanol, 1-octanol, citronellol, oleyl alcohol, and the like, cyclical alcohols such as benzyl alcohol, meta-cresol, and the like, fatty acids such as hexanoic acid, octanoic acid, oleic acid, linoleic acid, and the like, or esters thereof, polyethylene glycol, polypropylene glycol, and the like, and two or more of these can be used at the same time. Among these, from the viewpoint of miscibility (refining property), a polyether having three or more hydroxyl groups is preferable.

[0045] As the polyether having three or more hydroxyl groups, for example, glycerol propoxylate, trimethylolpropane propoxylate, sorbitol propoxylate, glycerol ethoxylate propoxylate, trimethylolpropane ethoxylate, sucrose propoxylate, and the like can be mentioned. Among these, glycerol propoxylate is preferable.

[0046] The viscosity of the polyether having three or more hydroxyl groups at 23°C is generally 100 to 4000 mPa-s, and preferably 200 to 1000 mPa-s.

[0047] As a commercial product of a polyether having 3 or more hydroxyl groups, for example, Adeka G series, Adeka T series, Adeka SP series, Adeka AM series, Adeka GM series, Adeka R series (all of which are manufactured by Adeka Corporation) and the like can be exemplified.

[0048] The content of calcium sulfate in the hardening material is generally 65 to 85 mass%, and preferably 70 to 80 mass%. By the content of calcium sulfate in the hardening material being 65 mass% or more, the compressive strength of the hardened product can be increased, and by being 85 mass% or less, the precision of the mold can be increased.

[0049] The viscosity at 23°C of the hardening material is generally 4 to 40 Pa-s, and preferably 5 to 35 Pa-s. According to this, by the viscosity at 23°C of the hardening material being 4 Pa-s or more, the compressive strength of the hardened product can be increased, and by being 40 Pa-s or less, the precision of the mold can be increased.

[0050] For the hardening material, it is also preferable to contain zinc oxide having a number average particle diameter of 100 nm or less. According to this, the compressive strength of the hardened product can be increased.

[0051] The hardening material can also contain a pH adjusting material, a hardening accelerator, a dispersion stabilizer and the like.

[0052] As the pH adjusting material, there is no particular limitation, but for example, magnesium hydroxide, magnesium oxide and the like can be exemplified.

[0053] As the hardening accelerator, there is no particular limitation, but for example, glucono delta lactone, lactic acid, citric acid, potassium fluorotitanate, sodium fluorotitanate (English: glucono delta lactone, lactic acid, citric acid, potassium fluorotitanate, sodium fluorotitanate) and the like can be exemplified.

[0054] As the dispersion stabilizer, there is no particular limitation, but for example, fumed silica and the like can be exemplified.

[0055] The volume ratio of the hardening material with respect to the main material is generally 0.25 to 0.5, and preferably 0.4 to 0.5. According to this, the compressive strength of the hardened product can be increased.

[0056] [1 Material Type]

[0057] The content of the alginate in the alginate dental impression material is generally 7 to 15 mass%, and preferably 10 to 14 mass%. By the content of the alginate in the alginate dental impression material being 7 mass% or more, the compression strength of the hardened product can be improved, and by being 15 mass% or less, the accuracy of the impression can be improved.

[0058] The content of the aminocarboxylic acid in the alginate dental impression material is generally 0.01 to 2 mass%, and preferably 0.05 to 0.5 mass%. By the content of the aminocarboxylic acid in the alginate dental impression material being 0.01 mass% or more, the storage stability of the alginate dental impression material can be improved, and by being 2 mass% or less, the compression strength of the hardened product can be improved.

[0059] The content of the calcium sulfate in the alginate dental impression material is generally 12 to 45 mass%, and preferably 15 to 40 mass%. By the content of the calcium sulfate in the alginate dental impression material being 12 mass% or more, the compression strength of the hardened product can be improved, and by being 45 mass% or less, the accuracy of the impression can be improved.

[0060] In the alginate dental impression material, it is preferable that zinc oxide having a number average particle diameter of 100 nm or less is further contained. By this, the compression strength of the hardened product can be improved.

[0061] The alginate dental impression material preferably further contains a hardening retarder. By this, the storage stability of the alginate dental impression material can be improved.

[0062] The hardening retarder is not particularly limited, but sodium pyrophosphate and the like can be exemplified.

[0063] The alginate dental impression material can also contain a liquid component, a nonionic surfactant, a pH adjuster, a hardening accelerator, a filler, and the like.

[0064] The liquid component is not particularly limited, but liquid paraffin and the like can be exemplified.

[0065] The nonionic surfactant is not particularly limited, but polyoxyalkylene alkyl ether and the like can be exemplified.

[0066] The pH adjuster is not particularly limited, but magnesium hydroxide, magnesium oxide, and the like can be exemplified.

[0067] The hardening accelerator is not particularly limited, but gluconolactone, lactic acid, citric acid, potassium fluorotitanate, sodium fluorotitanate, and the like can be exemplified.

[0068] The filler is not particularly limited, but diatomaceous earth and the like can be exemplified.

[0069] [Example]

[0070] Hereinafter, the present application will be described in detail with reference to Examples and Comparative Examples, but the present application is not limited to these Examples.

[0071] [2 Material Types]

[0072] [Examples 1-1 to 1-11 and Comparative Examples 1-1 to 1-4]

[0073] The main material was obtained by mixing alginate, trisodium ethylenediaminetetraacetate (EDTA-3Na), polyoxyalkylene alkyl ether (POAAE), and sodium pyrophosphate in the mixing amounts shown in Table 1.

[0074] The hardening material was obtained by mixing calcium sulfate, glycerol propoxylate, zinc oxide powder, magnesium hydroxide, potassium fluotitanate, and fumed silica in the mixing amounts shown in Table 1.

[0075] Note that the information on the raw materials described in Table 1 is shown below.

[0076] Sodium alginate: Duck Algin NSPM (manufactured by Kikkoman Corporation)

[0077] Potassium alginate: Duck Algin K (manufactured by Kikkoman Corporation)

[0078] POAAE: Narrow Acty CL (manufactured by Sankyo Yuka Kogyo Co., Ltd.)

[0079] Glycerol propoxylate: G-300 (manufactured by Adeka Corporation)

[0080] Zinc oxide powder A: number average particle diameter of 20 nm

[0081] Zinc oxide powder B: number average particle diameter of 100 nm

[0082] Further, the method for measuring the number average particle diameter of the zinc oxide powder is shown below.

[0083] <Number Average Particle Diameter of Zinc Oxide Powder>

[0084] The number average particle diameter of the zinc oxide powder was measured using a laser dynamic light scattering instrument ELS-Z (manufactured by Otsuka Electronics Co., Ltd.) with water as the dispersion medium.

[0085] Next, the viscosities of the main material and the hardening material were measured.

[0086] <Viscosities of Main Material and Hardening Material>

[0087] An E-type viscometer RE-85 (manufactured by Toyo Seiki Co., Ltd.) was used, and the measurement was performed at a cone angle of 3° and a shear rate of 24 s-1 The viscosity of the main agent and the hardening agent at 23°C was measured under the conditions of a rotation number of 12 rpm.

[0088] Next, the compressive strength of the hardened product, the initial setting time, the storage stability of the main agent, and the precision of the impression were evaluated.

[0089] <Compressive strength of hardened product>

[0090] After the main agent and the hardening agent were weighed on a mixing paper (blender paper) in the volume ratio shown in Table 1, mixing (blending) was performed for 30 seconds using a spatula, and the compressive strength of the hardened product was measured in accordance with JIS T6505.

[0091] <Initial setting time>

[0092] After the main agent and the hardening agent were weighed on a mixing paper in the volume ratio shown in Table 1, mixing was performed for 30 seconds using a spatula, and the initial setting time was measured in accordance with JIS T6505. Note that the initial setting time was measured in units of 5 seconds.

[0093] <Storage stability of main agent>

[0094] After the main agent was stored for one week in an environment of 60°C and 100% RH, the viscosity at 23°C was measured in the same manner as described above, and the change rate of the viscosity of the main agent was calculated in accordance with the formula

[0095] [(viscosity after storage) - (initial viscosity)] / (initial viscosity) x 100

[0096]

[0097] <Precision of impression>

[0098] After the main agent and the hardening agent were weighed on a mixing paper in the volume ratio shown in Table 1, mixing was performed for 30 seconds using a spatula, and the precision of the impression was evaluated in accordance with the adaptability test to gypsum of JIS T6505.

[0099] Table 1 shows the evaluation results of the compressive strength of the hardened product, the initial setting time, the storage stability of the main agent, and the precision of the impression.

[0100] [Table 1]

[0101]

[0102] As is clear from Table 1, in the case of the alginate impression materials of Examples 1-1 to 1-11, the initial setting time was long, and the storage stability of the main agent was also high.

[0103] ​However, in the case of the alginate impression materials of Comparative Examples 1-1 to 1-4, since the amino carboxylic acid is not contained, the storage stability of the base material is low.

[0104] [1 material type]

[0105] Example 2-1 to 2-7 and Comparative Examples 2-1 to 2-3

[0106] An alginate impression material was obtained by mixing alginate, trisodium ethylenediaminetetraacetate (EDTA-3Na), calcium sulfate, zinc oxide powder, magnesium hydroxide, potassium fluotitanate, polyoxyalkylene alkyl ether (POAAE), liquid paraffin, sodium pyrophosphate, and diatomite in the mixing amounts shown in Table 2.

[0107] Next, the flow value of the alginate impression material was measured.

[0108] <Flow value>

[0109] After 16.8 g of the alginate impression material was weighed into a rubber cup, 40 cc of water was weighed and injected into the rubber cup, and then mixing was performed for 30 seconds using a spatula, whereby a mixture (temper) was obtained. Next, the mixture was filled into a metal ring having an inner diameter of 35 mm and a height of 50 mm, and was quickly extruded onto a glass plate to harden. The expansion (spreading) of the mixture due to the weight, that is, the diameter of the hardened product was measured, and was used as the flow value, which is a proxy property of the ease of dripping.

[0110] Next, the compression strength of the hardened product, the initial hardening time, the storage stability, and the precision of the impression were evaluated.

[0111] <Compression strength of hardened product>

[0112] After 16.8 g of the alginate impression material was weighed into a rubber cup, 40 cc of water was weighed and injected into the rubber cup, and then mixing was performed for 30 seconds using a spatula, and the compression strength of the hardened product was measured in accordance with JIS T6505.

[0113] <Initial hardening time>

[0114] After 16.8 g of the alginate impression material was weighed into a rubber cup, 40 cc of water was weighed and injected into the rubber cup, and then mixing was performed for 30 seconds using a spatula, and the initial hardening time was measured in accordance with JIS T6505. Note that the initial hardening time was measured in units of 5 seconds.

[0115] <Storage stability>

[0116] After the alginate impression material was stored for one week in an environment of 60°C and 100% RH, the flow value was measured, and the change in the flow value was calculated according to the formula

[0117] (flow value after storage) - (initial flow value)

[0118] The change in the flow value of the alginate impression material was calculated.

[0119] <Accuracy of impression>

[0120] After 16.8 g of the alginate impression material was weighed and put into a rubber cup, 40 cc of water was weighed and poured into the rubber cup, and then the mixture was mixed for 30 seconds using a spatula, the accuracy of the impression was evaluated according to the gypsum adaptability test of JIS T6505.

[0121] Table 2 shows the evaluation results of the compressive strength of the hardened product, the initial setting time, the storage stability, and the accuracy of the impression.

[0122] [Table 2]

[0123]

[0124] As shown in Table 2, in the case of the alginate impression materials of Examples 2-1 to 2-7, the initial setting time was long, and the storage stability of the base material was also high.

[0125] However, in the case of the alginate impression materials of Comparative Examples 2-1 to 2-3, since the amino carboxylic acid was not contained, the storage stability was low.

[0126] This international application claims priority based on Japanese Patent Application No. 2016-056593 filed on March 22, 2016, and the contents of Japanese Patent Application No. 2016-056593 are incorporated into this international application in its entirety.

Claims

1. A dental alginate impression material, characterized by, having: a main material containing an alginate, an aminocarboxylic acid, and water; and a hardening material containing calcium sulfate and a non-aqueous dispersion medium, wherein the content of the alginate in the main material is 3 to 10 mass%, and the content of the aminocarboxylic acid is 0.01 to 2 mass%, the hardening material further contains zinc oxide having a number average particle diameter of 100 nm or less, the non-aqueous dispersion medium is a polyether having three or more hydroxyl groups, the viscosity of the polyether having three or more hydroxyl groups at 23°C is 100 to 4000 mPa·s.

2. The alginate impression material for dental use according to claim 1, wherein the content of the calcium sulfate in the hardening material is 65 to 85 mass%.

3. The alginate impression material for dental use according to claim 1, wherein the viscosities of the main material and the hardening material at 23°C are 4 to 40 Pa·s, respectively.

4. The alginate impression material for dental use according to claim 1, wherein the volume ratio of the hardening material to the main material is 0.25 to 0.

5. ​

Images