JPH04189350A - Production of composite resin inlay - Google Patents

Abstract

PURPOSE:To facilitate the parting of a resin cured body from a plaster mold and to allow the smooth attachment and detachment of this body into and from a patient's cavity by successively applying water-soluble alginate and an aq. medium soln. of a water-soluble alkaline metal salt over the entire surface of the cavity and adjacent tooth of the plaster mold and drying the coating, then packing and curing a composite resin. CONSTITUTION:The working mold obtd. from the plaster mold is used and the water-soluble alginate is applied over the entire surface of the cavity and the adjacent tooth. The aq. medium soln. of the water-soluble alkaline metal salt is applied on this alginate surface and thereafter, gas is blown to the coated surface to form a smooth surface on the surface of the alginate which is a separating agent. The composite resin for inlay is packed and formed on this surface and is cured; further, the cured body is put into a heat treating device in order to progress the curing.

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention relates to a method for manufacturing a dental composite resin inlay, and more specifically, a method for easily separating a cured composite resin inlay from a plaster model. Regarding the method for.

<Prior art> Conventionally, in the field of dental technology, as a method to facilitate the separation of a cured composite resin inlay and a plaster model, the following methods are usually used: ■ An aqueous solution containing a polymerization inhibitor;
■A silicone resin emulsion or a separation agent such as water-soluble alginate was applied to the entire surface of the cavity on the plaster model and allowed to dry.Then a composite resin for an inlay was filled and cured.

However, when applying an aqueous solution containing a polymerization inhibitor as a separating agent, the surface of the cured composite resin body is insufficiently hardened, resulting in low surface hardness, low mechanical strength, and poor wear resistance.
There were some problems in terms of anti-fracture properties. In addition, when applying a silicone resin emulsion as a separation 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 gets mixed inside the cured composite resin, leaving the surface of the cured body unrefined. Sometimes it's even. Furthermore, when applying water-soluble alginate as a separating agent, if the thickness of the coating layer increases, the coating film surface will not harden and stagnate, and the alginate will adhere to the surface of the cured composite resin, and in severe cases, the cured composite resin will be damaged. Alginate may be mixed inside.

In the case of composite resin inlays, the curing shrinkage rate is higher than that of ordinary metal inlays, so when manufacturing externally cured inlays such as Class II cavities, it is necessary to thicken the separating agent layer applied to the surface of the plaster model. The release of the cured inlay from the plaster model becomes difficult. Furthermore, even if it were possible to release the mold, it would not be possible to smoothly attach and detach it when fitting it into a patient's cavity. It is difficult to increase the thickness of the separating agent layer with the existing separating agents described in (1) to (4) above, and in this respect, they lack suitability as separating agents for composite resins.

<Invention or Problem to be Solved> In view of the above-mentioned problems of existing separation agents for composite resins, the present inventors have completed the present invention as a result of intensive research. The purpose of the present invention is to provide a new water-soluble alginate-based separating agent that solidifies well on the surface even when applied thickly. Another object of the present invention is to provide an excellent method for producing composite resin inlays using the water-soluble alginate-based separating agent.

<Means for Solving the Problems> The above-mentioned purpose is to apply an aqueous solution of water-soluble alginate and water-soluble alkaline earth metal salt to the entire surface of the cavity on the plaster model, adjacent teeth, etc. when manufacturing a composite resin inlay. This is achieved by a method for manufacturing a composite resin inlay, which comprises sequentially applying and drying a medium solution, followed by filling and curing the composite resin.

The water-soluble alginate applied to the present invention is an aqueous solution of a water-soluble alginate such as sodium alginate or potassium alginate, and if necessary, a gelling time adjusting agent such as disodium phosphate, sodium phosphate, or sodium pyrophosphate. It can be obtained by appropriately blending a preservative such as rose hydroxybenzoic acid ester, and a lubricant such as glycerin or alcohol.

Examples of water-soluble alkaline earth metal salts include water-soluble calcium salts, magnesium salts, beryllium salts, and strontium salts. Among these, calcium nitrate, calcium chloride, and calcium acetate are most preferred. These water-soluble alkaline earth metal salts can be applied to the surface of the water-soluble alginate as a solution in an aqueous medium such as an aqueous solution or an alcohol solution, or they can be applied by spraying, as they have the property of solidifying through interaction immediately after application. or most preferred. The concentration of these alkaline earth metal salts in aqueous media varies depending on the amount of alginate, the type of alkaline earth metal salt, etc., and may not be generally specified.
It is usually about 1 to 20% by weight, preferably about 3 to 6% by weight.

Alcohols include methanol and ethanol.

Examples include propyl alcohol, isopropyl alcohol, etc., and ethanol is most preferred from the viewpoint of boiling point, operability, safety to the human body, etc.

Comparing 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 an alginate film is sharper.

After applying an aqueous medium solution of an alkaline earth metal salt to the alginate surface, a gas is sprayed onto the applied surface for about 10 seconds to form a smooth surface on the surface of the alginate, which is a separating agent. Composite resin for inlay is filled and formed on the surface and cured. In the case of a photopolymerizable paste, visible light irradiation is performed.

In order to further progress the curing, apply the cured product to 100 to 200
Preferably, it is placed in a heat treatment chamber at ℃.

<Effects of the Invention> According to the present invention, even if the separation agent layer of water-soluble alginate is made thick, the alginate layer is well solidified to the surface by application of the alkaline earth metal salt solution.

Therefore, alginate can be used not only for medial inlays where the separating agent layer is thin and dimensional accuracy is important, but also for external inlays where the separating agent layer needs to be thicker on the outer side, such as in class II cavities. Since the layer solidifies well to the surface, it becomes easy to release the cured composite resin from the plaster model.

It can also be easily attached and detached when trying on the patient's cavity.

The present invention will be specifically explained below with reference to Examples.

<Example> After a patient's class ■ cavity was taken with a silicone impression agent, this impression agent was used repeatedly to create five identical plaster models. Using a working model obtained from the plaster model, a separating agent layer was formed on the entire surface of the cavity and adjacent teeth using the five methods shown in Table 1 below.

In either method, sodium alginate (2,O
wt%), disodium phosphate (0,7wt96).

Benzoic acid (0,3wt%), glycerin (4,0w
t96).

Ethanol (7,0wt%) and water (86,0wt%
).

A water-soluble alginate made of After drying, a photopolymerizable composite resin having the composition shown in Table 2 below was filled and formed, and then exposed to a visible light irradiator (using Econolite manufactured by Kiki Yoshida) for 40 seconds each on the proximal and occlusal surfaces. Irradiated one by one.

Table 2: Whether the cured product was released from the mold immediately after irradiation with light.As is clear from Table 1, in the case of Comparative Examples 1 and 2, it was difficult to release the cured product from the working model. In the case of Comparative Example 3, whether the cured product could be released from the mold or not, sticky unsolidified Alcine-1 was adhered to the surface of the cured product.

Although the surface of the cured product was washed with water to remove unsolidified Alsine-1, the surface of the cured product was uneven, probably because some alginate was mixed inside the cured product. After heat-treating this cured inlay in an oven at 110° C. for about 10 minutes, it was returned to the cavity on the working model, but attachment and detachment were not smooth.

In the case of Examples 1 and 2 of the present invention, the water-soluble alginate was applied three times, and then the ethanol solution and aqueous solution listed in Table 1 were spray applied and air-dried.

After that, cured bodies were produced in the same manner as in Comparative Examples 1 to 3. The cured body was returned to the cavity on the working model,
In both cases, I was able to put it on and take it off smoothly.

Procedural Amendment Written February 73, 1992 Dear Commissioner of the Patent Office, -1.
Display of the case 1990 Patent Application No. 158350 2 Name of the invention Method for manufacturing composite resin inlay 3 Person making the amendment Relationship to the case Patent applicant address 5-17-4 Sumida, Sumida-ku, Tokyo 534 Osaka Patent Department, Kanebo Co., Ltd., 1-5-90 Tomobuchi-cho, Ichibejima-ku Telephone: (06) 921-1251 4. Date of amendment order 6. Column 7 of "Title of the invention" in the specification to be amended, Details of the content of the amendment. In the ``Title of the Invention'' section of the book, the text ``Method for manufacturing composite resin inlays'' will be corrected to ``Method for manufacturing composite resin inlays.''

that's all

Claims (1)

[Claims] When manufacturing 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 surface of the cavity on the plaster model and adjacent teeth, etc., and after drying, the composite resin inlay is A method for producing a composite resin inlay, characterized by filling and curing resin.