JP2793743B2 - Curing agent for impression material - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a curing agent for curing teeth and other impression materials used for molding.

[0002]

2. Description of the Related Art Alginate impression materials are used for molding teeth and the like by utilizing the fact that a gel-like cured product is obtained by combining an alginate base material with a curing agent such as calcium sulfate. ing.

[0003] Alginate impression materials are classified into two types, a powder type and a paste type, according to their packaging. The paste type is prepared by kneading alginate or the like with water in advance to form a paste. A hardening agent such as calcium sulfate is added in a paste state to the base material of the paste to be put to practical use.

A conventional paste-type alginate impression material hardener is a paste-like composition comprising a divalent metal salt, a reaction retarder and a flowable plasticizer (Japanese Patent Laid-Open No. 58-1983).
No. 35105), or a hardener composed of gypsum powder and a surfactant or glycol (Dental Materials Instrument No. 2)
Vol. 4, pages 435 to 445 (1983)), or a curing agent composed of gypsum and a nonionic surfactant (Japanese Unexamined Patent Publication No. Sho.
No. 9-101410) is known.

However, the cured product obtained by using the paste-type curing agent has problems such as a decrease in permanent set, a delay in gelation time, and a change in gelation time due to moisture absorption.
In order to solve the above-mentioned problem, a paste-type hardener in which a hardly water-soluble liquid admixture and a surfactant are added to a hardener such as calcium sulfate has already been proposed (JP-A-62-26).
No. 5210).

[0006]

An impression material obtained by kneading the paste-like curing agent and a base material composed of alginate / water is used to form a negative type of a tooth or a jawbone, and a gypsum kneaded product is formed in the negative type. Inject, cure, remove from the negative mold and make a model,
At that time, when the gypsum model is left for a long time until it is removed from the impression material negative mold, there is a problem that the impression material easily adheres to the gypsum model. There is also a problem that the surface of the obtained plaster model is rough and lacks in smoothness.

[0007]

Means for Solving the Problems The inventors of the present invention have conducted intensive studies to solve the above problems, and as a result, the system of a hardener such as calcium sulfate, a poorly water-soluble liquid compound and a surfactant has been further added to an amino acid compound. The present inventors have found that a good paste-like curing agent overcoming the above problems can be obtained by coexisting with the above, and have completed the present invention.

That is, the present invention provides calcium sulfate and / or
Or 100 parts by weight of lead silicate, poorly water-soluble liquid compound 10
A curing agent for an impression material, comprising 200 parts by weight, 0.1 to 10 parts by weight of a surfactant, and 0.01 to 10 parts by weight of an amino acid compound.

The calcium sulfate used in the present invention and / or
Alternatively, as the lead silicate, a known material used for a conventional impression material is used without any limitation. Specific examples of particularly preferred examples include calcium sulfate dihydrate, calcium sulfate hemihydrate, calcium sulfate anhydrous, and the like.
Also, lead silicate can be used in combination with calcium sulfate or alone.

The poorly water-soluble liquid compound used in the present invention is used for forming the curing agent of the present invention into a paste, and any liquid having a solubility in 100 g of water at 20 ° C. of 5 g or less can be used. Compounds may be used. Examples of the poorly water-soluble liquid compound include hydrocarbon compounds, aliphatic alcohols, cyclic alcohols, fatty acids, salts or esters thereof, and hydrophobic polymers, and hydrocarbon compounds are particularly preferably used. These hardly water-soluble liquid compounds preferably have 6 or more carbon atoms for the purpose of suppressing volatilization.

As the hydrocarbon compound, any of a chain compound and a cyclic compound can be used. Specific examples of hydrocarbon compounds that can be suitably used in the present invention are as follows. For example, hexane, heptane, octane, nonane, decane, undecane, dodecane, tridecane, tetradecane, pentadecane, kerosene, 2,7-
Aliphatic chain hydrocarbon compounds such as dimethyloctane and 1-octene; and alicyclic hydrocarbon compounds such as cycloheptane, cyclononane and liquid paraffin.

Examples of the aliphatic alcohol include saturated aliphatic alcohols such as 1-hexanol and 1-octanol; and unsaturated aliphatic alcohols such as citronellol and oleyl alcohol.

Examples of the cyclic alcohol include benzyl alcohol and meta-cresol.

The fatty acids include saturated fatty acids such as hexanoic acid and octanoic acid; and unsaturated fatty acids such as oleic acid and linoleic acid. Examples of the salt of the fatty acid include zinc octylate, zinc naphthenate, and the like. Furthermore, examples of the fatty acid ester include ethyl octanoate, dibutyl phthalate, glyceride oleate; vegetable oils such as olive oil and sesame oil; and animal oils such as liver oil and whale oil.

[0015] Examples of the hydrophobic polymer include polysiloxane. Specific examples include polydimethylsiloxane, polymethylphenylsiloxane, polymethylhydrogensiloxane, and polyphenylhydrogensiloxane. The amount of the above hardly water-soluble liquid compound to be used is such that calcium sulfate and / or
Alternatively, it is preferably 10 to 200 parts by weight, more preferably 50 to 150 parts by weight, based on 100 parts by weight of lead silicate.

As the surfactant used in the curing agent of the present invention, known surfactants can be used without any limitation, and anionic surfactants, cationic surfactants, amphoteric surfactants and non-surfactants can be used. Any of the ionic surfactants can be used. Specific examples of the surfactant include anionic surfactants such as alkyl sulfonates, alkylbenzene sulfonates, and alkyl ether carboxylates. Examples of the cationic surfactant include an alkylamine salt and a quaternary ammonium salt, and examples of the amphoteric surfactant include an aminocarboxylate. Examples of the nonionic surfactant include polyoxyethylene alkyl ether, polyoxyethylene alkyl phenyl ether, polyoxyethylene-polyoxypropylene block polymer, polyoxyethylene glycerin fatty acid ester, sorbitan fatty acid ester, and polyoxypropylene fatty acid ester. Sucrose esters, polyoxydiethylene alkylamines, and block polymers of polysiloxanes and polyoxyethylenes.

The amount of the above surfactant used is 0.1 to 100 parts by weight of calcium sulfate and / or lead silicate.
10 parts by weight, and more preferably 0.5 to 5 parts by weight.

The amino acid compound used in the present invention is
Amino acids, salts thereof, and amino acid / formaldehyde condensates. Particularly preferred examples are shown below, but known ones are used without any limitation. Glycine, alanine, valine, leucine,
Amino acids such as cysteine, aspartic acid, and glutamic acid, salts thereof, and amino acid / formaldehyde condensates may be used under the trade name Paftard [Ajinomoto Co., Ltd.].

The amount of the amino acid compound used is 0.00.0 parts by weight per 100 parts by weight of calcium sulfate and / or lead silicate.
Preferably it is 1 to 10 parts by weight. If the amount of the amino acid used exceeds 10 parts by weight, it is not preferable because the strength of the cured impression material decreases.

The curing agent for an impression material of the present invention may contain conventionally known additives in addition to the above components.

Specific examples include fillers such as diatomaceous earth and inorganic compounds such as zinc oxide, magnesium oxide, potassium titanium fluoride and potassium silicofluoride.

The method of mixing the components of the curing agent for an impression material of the present invention described above is not limited at all. Usually, a predetermined amount of calcium sulfate and / or lead silicate, a surfactant, and a powder of an amino acid-based compound are charged into a poorly water-soluble liquid compound, and then kneaded to form a paste.

As a base material used for kneading with the above-mentioned curing agent for an impression material, a base material preferably used in the present invention is specifically exemplified by a base material having the following composition.

(A) 100 parts by weight of alginate, (B) 3 to 30 parts by weight of a curing retarder, and (C) 1000 to 2,000 parts by weight of water The above-mentioned alginate is potassium alginate which is well known in conventional impression materials. , Sodium alginate and the like are employed without any limitation. Further, as the above-mentioned curing retarder, alkali metal phosphate, oxalate, carbonate and the like are used. Further, in addition to the above main components, an unsaturated carboxylic acid polymer may be blended in an amount of 5 to 150 parts by weight.

[0025]

The curing agent for an impression material of the present invention is kneaded with a base material containing alginate as a main component, and is used for molding teeth and the like.

For the production of the teeth and other models, a tooth and other negative molds are taken with an impression material, and a gypsum mixture is injected into the negative mold and cured. Remove it from the shade to get a model. At that time, even if the gypsum is poured into the negative mold and left for a long time, the adhesion of the impression material to the gypsum model does not occur if the curing agent for the impression material of the present invention is used unlike the conventional curing agent. . Moreover, the gypsum surface has few uncured portions, is smooth, and a precise model can be obtained.

[0027]

EXAMPLES Hereinafter, the present invention will be described more specifically with reference to examples, but the present invention is not limited to these examples.

The lubricity of the gypsum was evaluated by measuring the surface roughness. The surface roughness was represented by a ten-point average roughness using Surfcom 570A-3D manufactured by Tokyo Seimitsu Co., Ltd.

Example 1 To 100 parts by weight of calcium sulfate dihydrate, predetermined amounts of a poorly water-soluble liquid compound, a surfactant, and an amino acid-based compound shown in Table 1 were added, and the mixture was sufficiently mixed. This curing agent was kneaded with the base material shown in Table 2. In this embodiment, N
In O.10, 100 parts by weight of lead silicate was used instead of 100 parts by weight of calcium sulfate dihydrate.

Then, after an impression of a resin-made tooth model was obtained from the kneaded impression material, gypsum was poured into a negative mold of the impression material.
After standing for 80 minutes, the gypsum model was taken out and the model surface was observed.

The results are shown in Table 1. In all cases, no impression material adhered to the gypsum surface, and a smooth surface was obtained.

[0032]

[Table 1]

[0033]

[Table 2] Example 2 10 parts by weight of potassium alginate, 12 parts by weight of sodium polyacrylate (average molecular weight 300,000), diatomaceous earth 40
A base paste consisting of parts by weight and 220 parts by weight of water was prepared. Next, various curing agent pastes shown in Table 3 were produced. 2.6 parts by weight of the base paste and 1 part by weight of the curing agent paste were mixed and kneaded to prepare a kneaded impression material, to obtain an impression of a plastic tooth model, and then to add the gypsum to the kneaded impression material Was poured, and a gypsum model was taken out after 180 minutes.
A plaster model was observed in the same manner as in Example 1. The results are also shown in Table 3.

[0034]

[Table 3]

Comparative Example 1 A curing agent paste was prepared in the same manner as in Example 2 except that the amino acid compound was not used. 1 part by weight of this hardener paste and 2.6 parts by weight of the base paste of Example 2 were mixed and kneaded to obtain an impression of a plastic tooth model, and then plaster was poured into the impression-taking surface, and after 180 minutes, gypsum I took out the model. Observing the plaster model surface,
The impression agent was partially adhered to the surface. The surface roughness of the portion where the impression material was not attached was rough at 14.4 microns.

[0036]

Continuation of the front page (56) References JP-A-61-85306 (JP, A) JP-A-62-265210 (JP, A) JP-A-61-5 (JP, A) JP-A-59-225104 (JP) , A) (58) Field surveyed (Int. Cl. ⁶ , DB name) A61K 6/00

Claims (1)

(57) [Claims] 1. Calcium sulfate and / or lead silicate 10
0 to 10 parts by weight of a poorly water-soluble liquid compound, 0.1 to 10 parts by weight of a surfactant, and 0.01 to 10 parts by weight of an amino acid compound for an impression material. Curing agent