JPS5942648B2 - Agar impression material for combined impression - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an associated impression mold material used for taking dental impressions in dental treatment, and more specifically, in an associated impression material that uses, for example, an alginate impression material as a solidifying material, a fluorine-based surfactant is added to the associated impression material. The present invention relates to a molding material for a combined impression that uses the agar impression material containing the present invention as a molding material.

Single impression materials used in dental treatment include colloid,
Rubber-based and gypsum-based impression materials each have their own characteristics, but for impressions of intrusive structures or areas that require precision, such as teeth with anchor cuts or teeth with many gaps, sol-based impression materials are recommended. Colloidal impression materials having good fluidity and high elasticity after gelling are excellent.

However, conventional colloid impression materials also have the following drawbacks, which are the causes of hindering their rapid spread.

(1) Since it is an impression taking method that utilizes temperature changes, it takes time to get used to it.

(2) The long solidification time of the impression material causes pain to the patient.

(3) Currently, equipment has to be imported, which is expensive and requires capital investment.

(4) The thickness and shape of imported equipment do not suit Japanese people.

(5) When agar alone is used as an impression-taking material, the cost of consumable materials increases.

Therefore, a combination impression material of an agar impression material and an alginate impression material was devised to improve the above-mentioned drawbacks of the agar impression material.

This method makes it easy to take highly accurate full jaw impressions, and has recently become popular in clinical rooms.

In this method, a sol of agar impression material (i.e., an impression material consisting of agar, pigments, fillers, etc.) is poured onto the defective tooth or gingival surface of the treatment area, and before it solidifies, a pre-cooled alginate impression material (i.e., alginic acid, Impression materials (made of plaster, pigments, filling materials, etc.) are pressed against the upper jaw and all teeth in the upper jaw.

The purpose of cooling the alginate impression material is to delay hardening during preparation, so it is kneaded with cold water and kept cool.

This operation also has the effect of shortening the solidification time after adhesion of the art materials.

Note that potassium sulfate may be added to each of the above impression materials for the purpose of improving the surface condition of the plaster.

Potassium sulfate acts as a gypsum hardening accelerator, so surface roughness caused by delayed gypsum hardening is alleviated, and a gypsum model with a good surface condition can be obtained.

However, the addition of potassium sulfate inhibits the adhesion between the agar impression material and the alginate impression material, which is a fatal drawback for the combined impression material.

For this reason, in the currently widely used joint stamping, potassium sulfate is not added in order to improve the adhesive strength between the agar impression material and the Alcine-1 impression material.

Therefore, the surface of the plaster model may become rough, and pigments (especially hydrophobic pigments) may aggregate as clinicians repeat the process of boiling, keeping warm, cooling, and boiling again each time they use the impression material. have.

Furthermore, when the pigment is water-soluble, aggregation does not pose much of a problem, but there is a drawback that the color transfers to the plaster model.

Another method for preventing agglomeration of pigments and the like is to add a dispersant, but it has been pointed out that the dispersant acts as a retardant for the hardening of the plaster, causing the surface of the plaster to become rough.

As mentioned above, the agar/alginate combination impression material has the excellent advantage that the molding surface is precise and impressions can be easily taken even from tooth-like structures. Alternatively, there remains the drawback of agglomeration of pigments.

Ultimately, based on the above-mentioned content, we believe that the desirable conditions that the combined impression material should have are as follows.

(1) It has elasticity that enables rapid and accurate reproduction of tooth impressions and does not cause any trouble during removal.

(2) The mold material and the solidifying material are in close contact with each other, so that the solidifying material can rapidly absorb the heat of the molding material.

(3) The mold material and the solidifying material are completely bonded and integrated.

(4) A good surface condition can be obtained without delaying the curing speed of the plaster tooth mold.

(5) No aggregation occurs in the pigment in the mold material.

The present invention provides an agar impression material for association impressions that satisfies the above conditions, and the intended contact point is between the agar impression material and, for example, an alginate impression material (which is not limited to the solidifying material). The object of the present invention is to provide a combined impression material such as agar/alginate that strengthens adhesion, prevents pigments in the mold material from agglomerating during use, and provides a smooth plaster surface.

The agar impression material for combined impressions that has achieved the object of the present invention is characterized in that 0.1 to 065% by weight of a fluorine-based surfactant is added to the impression material made of agar, borax, pigment, etc. The structure is such that an impression material is used as a mold material and an alginate impression material or the like is used as a solidifying material.

The fluorine-based surfactant used in the present invention is generally a synthetic resin,
It is used as a wetting agent etc. that is added to organic solvents etc. to lower the surface tension. agent)
, perfluoroalkyl betaine (amphoteric surfactant),
Examples include barfluoroalkylethylene oxide (nonionic surfactant).

It is believed that the effects of the present invention are also derived from such a wetting action of the present active agent, but the effects were beyond expectations.

Conventionally used surfactants had the disadvantage of roughening the surface of the impression material due to their foaming effect, but this fluorine-based surfactant does not cause such a phenomenon, and its addition improves the quality of the mixed components. The dispersibility of the pigment was improved and the aggregation of the pigment was eliminated.

Furthermore, in the presence of potassium sulfate, the adhesion between the mold material and the solidifying agent is improved, and the delaying effect on plaster hardening that is often experienced with conventional dispersants is reduced, resulting in a plaster model with a smooth surface. Obtained.

In addition, in order to exhibit the above effects, the fluorine-based surfactant must be 0.1
It is necessary to contain up to 0.5% by weight.

If the content is less than 0.1% by weight, the above effects cannot be obtained, while if the content exceeds 0.5% by weight, physical properties such as gel strength, permanent strain, and elastic strain will deteriorate.

Next, the composition ratios of the agar impression material used as the molding material of the present invention and the reasons for their recommendation are as follows.

(A) Powder agar 3.0 to 15.0% by weight (1) When the composition ratio is less than the lower limit ■ The viscosity is low and it becomes difficult to maintain the gel state.

■ Due to the high water content, dimensional changes are large and accurate impressions of teeth cannot be taken.

■ When taking an impression of the upper jaw, it flows down.

(2) When the composition ratio exceeds the upper limit■ Because the viscosity is high and the fluidity is nil/1, it becomes difficult to penetrate into the minute gaps of the teeth, making it difficult to take accurate impressions.

■ Agar injection needles generally use a diameter of 0.8 mm, so they do not come out easily and may gel at the needle and become clogged.

(B) Borax o, i ~ 0.3% by weight Has the function of improving gel strength, 0.10! , the gel strength is satisfactory at 0.3% or more, but it is not economical to use an excessive amount.

This is thought to be due to the fact that borax reacts with agar to form borax salt, increasing the skeletal strength or density of the micelles.

(C) Pigment 0.1-0.3% by weight (1) When the composition ratio is less than the lower limit ■ The color of the mold material is pale, making it difficult to judge whether the impression is good or bad.

■ Because the pigment concentration is low, air bubbles in the agar become noticeable, making it undesirable as a product.

(2) When the composition ratio exceeds the upper limit, the required amount is sufficient, and excess increases the price of the impression material.

(D The reason for limiting the composition ratio of 0.1 to 0.5% by weight of fluorine-based surfactant is as described above.

(E) 7J (96.7 to 88.9% by weight) The composition ratio of water is the remainder of the other agents, and its level naturally affects the concentration and ultimately the viscosity.

Finally, examples of the present invention will be described.

Example 1 Powdered agar 11% by weight Borax 0.2 Pigment 0.211''-Luo0a'' 0.1. Full carboxylic acid salt water 88.5 The agar impression material for molds of the present invention was obtained by thoroughly mixing the raw materials with the above-mentioned mixing ratio in a stainless steel container, leaving the mixture at room temperature for 24 hours, and heating and stirring on a hot water bath for about 1 hour. The sol-like viscous material is stored in an appropriate form as a gel-like material.

When in use, after heating this gel to the solization temperature,
The required amount is injected into the missing tooth or tooth gap, and then, before the agar impression material is solidified, a pre-cooled sol-like solidifying material is coated thereon and integrated to form a combined impression material.

When plaster was poured into the impression obtained in this way and a tooth model was made, it was possible to obtain a model with a smooth surface, good light selection, and accuracy.

Furthermore, the time required for model production was also reduced compared to when conventional agar impression materials (containing surfactants other than fluorine-based surfactants) were used.

For the above impression, a sol-like viscous material of the above composition was filled into a cartridge in a volume of about 2 ml using a dispenser and stored with the end sealed with aluminum. It is also possible to use a product that has been stored by suctioning it into a stainless steel pipe or glass tube, cooling and solidifying it, cutting it into a stick shape by cutting it into a length of about 5 cIrL.

Claims (1)

[Claims] 1. In the combined impression mold material used for taking tooth impressions for dental treatment, 01 to 0 fluorine-based surfactant is added to the agar impression material.
An agar impression material characterized by containing 5% by weight.