JPH03255012A - Dustless impression material of alginic acid salt for dentistry - Google Patents

Abstract

PURPOSE:To obtain the subject impression material readily producible and having excellent preservability or accuracy of gypsum model preventing the generation of dust in using by co-using an impression material comprising alginic acid salt, gelling agent, gelling-controller and filler with a polyether-modified silicone oil containing hydrophilic group. CONSTITUTION:Alginic acid salt such as sodium alginate or potassium alginate is mixed with a gelling agent such as calcium sulfate dihydrate or calcium sulfate half-hydrate, a gelling-controller such as sodium salt or potassium salt of phosphoric acid, silicic acid or carbonic acid, etc., and a filler such as diatomaceous earth, silicic acid anhydride or talc as essential ingredients to obtain a powdery impression material of alginic acid salt. Next, said impression material is mixed with 1-5wt.% polyether-modified silicone oil containing hydrophilic group expressed by the formula (R is hydrophilic group such as COOH, OH, NH2 or CONH2) as dust scattering-inhibitor to afford the objective dustless impression material having the above-mentioned effect, namely, readily mixed and produced and generating only a slight amount of dust in using.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a dental alginate impression material provided in powder form, and to an impression material that prevents the powder from scattering during use.

Conventional technology Impression material is mixed with water to form a paste, and to create a dental prosthesis, it is placed in an impression material container and compressed in the oral cavity to gel and create a negative mold, into which plaster is poured. A mold is taken and a prosthesis is made from this.

Traditionally, alginate impression materials contain sodium or potassium alginate as the alginate, calcium sulfate dihydrate or hemihydrate as the gelling agent, sodium or potassium salts such as phosphoric acid, silicic acid, carbonate, etc. as the gelling agent, and fillers as the filler. The ingredients include diatomaceous earth, silicic anhydride, and talc.

Alginate impression material powder has a tendency to separate into storage components in the container, and the container must be shaken to homogenize the contents prior to use. Therefore, when the lid of the container is opened, dust is scattered, and when mixed with water, there is a high risk that the dust will be scattered and the user will inhale it, which is not good for health.

In order to prevent this drawback, a patent application was published in 1986-501.
No. 426 uses xanthan gum, hydroxyethyl or hydroxymethyl cellulose, carboxymethyl cellulose, sodium or potassium polyalginate, polyethylene glycol, polypropylene glycol, polybutylene glycol, ethylene glycol, propylene as a coating agent to prevent powder scattering. Impression materials containing glycol, triethanolamine, lauryl sulfate, sucrose butyrate, chrycerol esters, etc. are disclosed.

However, the hydrophilic nature of these coating agents causes deterioration of the impression material, resulting in poor storage stability.

In JP-A No. 59-225104, in addition to known impression material compositions, it is made of one or more types and has a vapor pressure of 3 at 20°C.
．． Hydrophobic liquid hydrocarbon with less than 15w@Hg.

An impression material made of fatty acid, alcohol, oil, fat, silicone oil, and a nonionic surfactant is disclosed, and in Japanese Patent Publication No. 1-42245, in addition to known impression material compositions, 20° The vapor pressure at C is 3
．． An impression material is disclosed comprising polyvinylpyrrolidone and one or more silicone oils containing no more than 15 parts per ml and containing no hydrocarbon or hydrophilic groups which are hydrophobic.

However, these inventions require the mixing of a parent material and a hydrophobic material, and it is considered that the balance of peripheral components becomes a problem in order to optimize the storage stability and miscibility with water of the impression material.

Means for Solving the Problems The present invention eliminates these drawbacks and provides an impression material that generates less dust during use, is easy to manufacture, and has excellent preservability and accuracy for plaster models. It provides:

That is, the present invention is an alginate and a gelling agent.

This is a dental alginate impression material characterized by comprising a polyether-modified silicone oil containing a gelling modifier, a filler, and a hydrophilic group.

As the alginate, gelling agent, gelling regulator, and filler, known ones are used as described above. It is also known to those skilled in the art that colorants, fragrances, etc. can be added.

The polyether-modified silicone oil containing a hydrophilic group of the present invention has a dimethylpolysiloxane portion as a hydrophobic group and a polyether portion as a hydrophilic group, and generally has the following structural formula.

R is, for example, -COOH, -OH, -Nt12. -CON
It is H2.

The content of polyether-modified silicone oil containing hydrophilic groups (hereinafter referred to as modified silicone oil), which is an essential component of the present invention, is 1 to 5% by weight, and if it is less than 1%, no dust scattering prevention effect is observed. Moreover, if it exceeds 5%, it becomes difficult to knead.

EXAMPLES Next, Examples will be shown, but these are intended to illustrate the present invention, and are not intended to limit the scope of the invention.

Example 1 Weight % Sodium alginate 13-dihydrate gypsum
12 diatomaceous earth
57 Silica gel 8 Sodium birophosphate 4 Modified silicone oil 3 The above composition was placed in a container, and when the lid was opened after shaking, almost no dust was observed. When kneaded, it was wetted with water for 7 seconds and became a paste after 12 seconds. No dust was observed during this period. It was easy to prepare and manufacture an appropriate impression material, and the storage stability and plaster model surface were also good.

Claims (1)

[Claims] 1. A dust-free dental alginate impression material comprising an alginate, a gelling agent, a gelling regulator, a filler, and a polyether-modified silicone oil containing a hydrophilic group.