JP2579297B2 - Manufacturing method of composite resin inlay - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a method for manufacturing a dental composite resin inlay, and more particularly, to facilitate separation of a cured composite resin inlay from a plaster model. For how to.

<Prior Art> Conventionally, in the field of dental technology, as a method for facilitating separation of a cured composite resin inlay body and a gypsum model, usually, an aqueous solution containing a polymerization inhibitor, an emulsion of a silicone resin or a water-soluble After a separating agent such as alginate was applied to the entire cavity of the gypsum model and dried, a composite resin for inlay was filled, formed, and cured.

However, when applying an aqueous solution containing a polymerization inhibitor as a separating agent, the cured composite resin surface is insufficiently cured, the surface hardness, the mechanical strength is low, the abrasion resistance, the anti-crushing point. There was a problem. When a silicone resin emulsion is used as a separating agent, it is necessary to wash the silicone resin adhering to the surface of the cured composite resin with water, and sometimes the silicone resin is mixed into the interior of the cured composite resin and the surface of the cured resin becomes improper. It may be uniform. Furthermore, when a water-soluble alginate is used as a separating agent, when the thickness of the coating layer increases, the surface of the coating film does not solidify and becomes sticky, and the alginate adheres to the surface of the cured composite resin, and in extreme cases, the alginate adheres to the inside of the cured composite resin. Alginate may be contaminated.

In the case of composite resin inlays, the curing shrinkage is higher than that of ordinary metal inlays, so when manufacturing an outer inlay cured body such as a class II cavity, the thickness of the separating agent layer applied to the gypsum model surface must be increased. It becomes difficult to release the inlay cured product from the plaster model. Also, even if the mold can be released, it cannot be smoothly attached or detached when trying on the cavity of the patient. Said ~
It is difficult for existing separation agents to thicken the separation agent layer,
In that respect, it was not suitable as a separating agent for a composite resin.

<Problems to be Solved by the Invention> In view of the above-mentioned problems of the existing composite resin separating agent, the present inventors have made intensive studies and completed the present invention. Where you do
An object of the present invention is to provide a novel water-soluble alginate-based separating agent which solidifies well to the surface even when applied thickly. Another object of the present invention is to provide an excellent method for producing a composite resin inlay using the water-soluble alginate-based separating agent.

<Means for Solving the Problems> An object of the present invention is to provide an aqueous medium solution of a water-soluble alginate and a water-soluble alkaline earth metal salt over the entire cavity and adjacent teeth on a gypsum model when manufacturing a composite resin inlay. Are sequentially applied and dried, and then the composite resin is filled and cured, thereby achieving a composite resin inlay manufacturing method.

The water-soluble alginate applied to the present invention may be added to an aqueous solution of a water-soluble alginate such as sodium alginate or potassium alginate, if necessary, with a gel time adjusting agent such as disodium phosphate, sodium phosphate, sodium pyrophosphate, etc. Preservatives such as parahydroxybenzoate,
It can be obtained by appropriately blending a lubricant such as glycerin or alcohol.

Examples of the water-soluble alkaline earth metal salts include water-soluble calcium salts, magnesium salts, beryllium salts, strontium salts, and the like. Preferably, calcium nitrate, calcium chloride and calcium acetate are most preferred. These water-soluble alkaline earth metal salts are applied to the surface of the water-soluble alginate as an aqueous medium solution such as a water-soluble or alcoholic solution. However, since they have the property of solidifying by interaction immediately after application, they are applied by spraying. Most preferably. The aqueous medium solution concentration of these alkaline earth metal points differs depending on the amount of alginate, the kind of alkaline earth metal salt, etc., and cannot be specified unconditionally,
Usually, it is about 1 to 20% by weight, preferably about 3 to 6% by weight.

Examples of the alcohol include methanol, ethanol, propyl alcohol, and isopropyl alcohol, and ethanol is most preferable from the viewpoint of the boiling point, operability, safety for the human body, and the like.

Compared to the case where water is used as the aqueous medium and the case where ethanol is used, the volatile ethanol solution is more preferable because the formation of the alginate film is sharper.

After applying the alkaline earth metal salt to the aqueous medium solution on the surface of the alginate and then blowing a gas on the surface for about 10 seconds, a smooth surface is formed on the surface of the alginate as a separating agent. The surface is filled with an inlay composite resin, formed and cured, and in the case of a photopolymerizable paste, visible light irradiation is performed.

In order to further advance the curing, the cured product is preferably placed in a heat treatment device at 100 to 200 ° C.

<Effects of the Invention> According to the present invention, even when the thickness of the separating agent layer of the water-soluble alginate is large, the application of the alkaline earth metal salt solution allows the alginate layer to be solidified well to the surface.

Therefore, not only in the case of the inner inlay where the separating agent layer is made thinner and emphasizing the dimensional accuracy, but also in the case of the outer inlay where it is necessary to make the separating agent layer thicker especially on the outer side such as a class II cavity,
Since the alginate layer is sufficiently solidified to the surface, it is easy to release the cured composite resin from the gypsum model. In addition, it can be smoothly attached and detached when trying on the patient's cavity.

 Hereinafter, the present invention will be described specifically with reference to examples.

<Example> After collecting a patient's class II cavity with a silicone impression agent, this impression agent was repeatedly used to make five identical plaster models. Using the working model obtained from the plaster model,
The separating agent layer was formed on the entire cavity and the adjacent teeth by the five methods shown in the table.

In either method, sodium alginate (2.0w
t%), disodium phosphate (0.7 wt%), benzoic acid (0.
3wt%), glycerin (4.0wt%), ethanol (7.0wt%
%) And water (86.0 wt%) were applied with a small brush, but were applied once in Comparative Example 1, twice in Comparative Example 2, and three times in Comparative Example 3. .

After a predetermined number of coatings, in the case of Comparative Examples 1 to 3, after drying with air as it is, a photopolymerizable composite register having the composition shown in Table 2 below was filled and formed, and subsequently, a visible light irradiator [( (Econolite manufactured by Yoshida Co., Ltd.)], the adjacent surface and the occlusal surface were irradiated for 40 seconds each.

The cured product was released from the mold immediately after the light irradiation. However, as is clear from Table 1, in the case of Comparative Examples 1 and 2, it was difficult to release from the working model. In the case of Comparative Example 3, the cured product could be released from the mold, but a viscous, unsolidified alginate adhered to the surface of the cured product. The surface of the cured product was washed with water to remove unsolidified alginate. However, the surface of the cured product was uneven, possibly because some alginate was mixed into the interior of the cured product. After heat-treating the cured body for inlay in a 110 ° C. oven for about 10 minutes, the cured body was returned to the cavity on the working model, but the attachment / detachment was not smooth.

In the case of Inventive Examples 1 and 2, a water-soluble alginate was applied three times, and then an ethanol solution and an aqueous solution shown in Table 1 were spray-coated and air-dried. After that, Comparative Example 1
A cured product was produced in the same manner as in the cases of Nos. 1 to 3. The cured body was returned to the cavity on the working model, but could be smoothly attached and detached in each case.

Claims (1)

(57) [Claims] When producing a composite resin inlay, a water-soluble alginate and an aqueous medium solution of a water-soluble alkaline earth metal salt are sequentially applied to the entire cavity and adjacent teeth on the gypsum model and dried. A method for producing a composite resin inlay, comprising filling and curing the composite resin.