JPH02144069A - Dental temporary sealing composition - Google Patents

Abstract

PURPOSE:To obtain strength proper to temporary sealing while the simplicity of the original operability of stopping is held by using 20-70wt.% of shellac being a natural resin in a recipe. CONSTITUTION:This composition is composed of a heat-cured mixture containing 20-70 wt.% of shellac, 0-30wt.% of a resin, 10-70wt.% of metal oxide, 3-10wt.% of fatty acid and 0-30wt.% of an arbitrary contrast agent and softened by an appropriate heating means at the time of use and falls in its temp. after use to be cured rapidly. By this method, the conditions of sealability, strength and operability can be satisfied.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention is a dental temporary sealant used in dental treatment, in which a small cylindrical solid containing shellac is softened by application of heating means such as flame. The present invention relates to a temporary dental sealing material composition that hardens as the temperature decreases.

The present invention is characterized by the use of shellac in this composition to increase compressive strength, and the inclusion of fatty acids and other ingredients for sealing properties and clinical operability.

BACKGROUND OF THE INVENTION In the prior art, temporary stoppings (hereinafter simply referred to as "stoppings") containing gutta-percha are generally used primarily for the purpose of temporary sealing. Temporary sealing temporarily seals the cavity that has been excised during treatment until the patient's next visit to the hospital, but it is an extremely important operation in oral treatment that is frequently performed in daily clinical practice. The purpose is to completely block communication with the outside world, prevent saliva, bacteria, etc. from entering the body, and achieve the original purpose of treatment. Erosion, pulp treatment,
Even if the root canal treatment is complete, if the temporary sealing is incomplete, the purpose cannot be achieved. 2 conditions required for temporary sealant
．． List 3.

a. Sealability: It is necessary to have the ability to seal the affected area by adhering closely to the tooth structure.

b. Strength: Requires compressive strength that can withstand occlusal pressure during eating.

C. Operability: It must be easy to operate in order to improve work efficiency.

Although various preparations for temporary sealing have been commercially available and are in practical use, no preparation has been completed that satisfies all of the above conditions. There is a need for something that satisfies all the requirements of sealability, strength, and operability.

Problems to be Solved by the Invention Although it is true that temporary fixings are widely used in dentistry due to their simplicity, their composition is mainly wax or rubber, so they do not adhere well to the tooth structure. It has the disadvantages of poor sealing properties due to poor mechanical strength, low mechanical strength, and large volume change due to temperature.

In the prior art, stoppings containing gutta-percha and having a form that is easy to operate are small cylindrical solids that are softened by flame before use. Stopping has a long history as a temporary sealing material and is still used clinically today, but as mentioned above, while it has traditionally been easy to operate, it is caused by the lack of strength of gutta-percha, the main ingredient in the prescription. It was pointed out that the filling material had fallen off, and the evaluation was not necessarily high.

Therefore, we conducted a study with the aim of developing a material with excellent sealing properties, strength, and operability by using something other than gutta-percha as the main agent.

Means for Solving the Problems The composition of the present invention is a temporary sealing material that does not contain gutta-percha. By using 20 to 70% by weight of shellac, a natural resin, in the formulation according to the present invention, it has been possible to obtain strength suitable for temporary sealing purposes while maintaining the ease of operation inherent in stoppers. In other words, the strength of the main component, Shichilac itself, significantly increased the strength of conventional stoppings. Although shellac is a substance that is stable over time, it has been confirmed that the optimum addition rate of shellac to the resin is 0 to 30% by weight in order to sufficiently maintain the stability of physical properties required for crystal. Further, metal oxides were added to maintain strength, and the appropriate addition rate was 10 to 70% by weight. Fatty acids were prescribed with the aim of making the softened state equivalent to stopping, taking into consideration clinical operability, but 3~
An addition rate of 10% by weight was optimal. In addition, since many doctors desire contrast properties in temporary sealing materials, we further investigated the addition of contrast agents and found that the addition rate at which a sufficient contrast effect could be obtained was at most 3.
It was 0% by weight.

Next, a case where a liquid medicine is used as a temporary sealing material will be explained. The temporary sealing material hardens quickly after filling, and the cured material is non-irritating.
It can withstand the chewing of food without breaking or abrasion, and it adheres tightly to the tooth structure, completely sealing the edge of the filling and the gap between the tooth structure and eliminating saliva and bacteria in the oral cavity until it is removed. must be completely prevented from entering. The degree of adhesion of the stopping composition or the strength of the filler after curing are also greatly related to the edge sealing properties. The following methods are used to measure sealability, strength, and operability.

a. Measurement of sealing property: Fill a glass tube with an inner diameter of 5 mm and a length of 5 Q mm with anhydrous copper sulfate, seal one end with a sample and the other end with silicone rubber, and then immerse it in warm water at 37°C for 7 days. Inspect the degree of discoloration of the anhydrous copper sulfate in the glass tube.

b. Measurement of compressive strength (JIS T-6602): A cylindrical test piece with an outer diameter of 5 mm and a length of 12 mm was prepared using a mold, and after being immersed in hot water at 37°C for 24 hours, the test piece was measured at 0.5 mm per minute.
The test piece is compressed at a speed of 25 mm and the compressive strength is measured.

Evaluation of C6 operability: Fill a glass tube with an inner diameter of 5 mm with a flame-softened sample using a spatula. Further, the cured product is removed by piercing it with an excavator heated by the flame of the curing machine. The ease of both filling and removal is tested.

The above C test measures the sealing property, but if the anhydrous copper sulfate changes color, it means that water has entered from the interface between the filling and the tooth structure, which is an indicator of the risk of bacterial invasion, and the test is rejected. judge. Furthermore, it is said that the compressive strength of the temporary sealant according to the test is required to be at least 70 to 200 kg/cnf. Furthermore, since there are individual differences in the evaluation of operability by the C test, evaluation is performed for subjects with at least 5 Å or more.

Tables 1 and 2 show the results of each test of the dental temporary sealing material composition used in the present invention, with commercially available stoppers as a control. C
In the test, no discoloration was observed and the product passed, the compressive strength in the test exceeded 300 kg/cffl, and the C test was easy to operate. Thus, it was confirmed that the composition obtained according to the present invention has excellent sealing properties, compressive strength, and operability as a temporary sealing material.

Example 1 50 g of diurnal purified shellac, 23 g of diurnal zinc white, 20 g of barium sulfate, and 7 g of lauric acid (special grade reagent) were melt-mixed evenly throughout the entire body at 120° C. or lower for 20 minutes.
The temporary sealant composition product of the present invention was manufactured by shaping it into a small cylinder with a length of 100 cm.

Example 2 Diurnal zinc white 36g, diurnal refined shellac 25g, barium sulfate 20g, diurnal magnesium oxide 6g, daily rosin 5
g1 JP stearic acid 4g1 oleic acid (special grade reagent >4
A temporary sealant composition product of the present invention was produced by uniformly heat-melting and mixing the whole mixture at 120° C. or below for 20 minutes and shaping it into a small cylinder with a diameter of 3.5 mm and a length of 100 mm.

Example 3 Daily purified shellac 65g/day zinc oxide 15g.

10 g of bismuth subcarbonate, 5 g of diurnal rosin, 1 lauric acid (
A temporary sealant composition product of the present invention is obtained by heat-melting and mixing 3 g of special grade reagent) and 2 g of diurnal stearic acid evenly throughout the entire body under 120°C for 20 minutes and forming a small cylinder with a diameter of 3.5 mm and a length of 100 m+n. was manufactured.

Example 4 50 g of daily purified shellac 1 22 g of zinc white 1 10 g of barium sulfate 10 g of primary bismuth carbonate 1 4 g of stearic acid 1 4 g of oleic acid (special grade reagent) at 120°C or below
A temporary sealant composition product of the present invention was produced by uniformly hot-melting the mixture for 0 minutes and shaping it into a small cylinder with a diameter of 3.5 mm and a length of 100+ nm.

Example 5 48 g of daily zinc white, 24 g of daily refined shellac, 22 g of barium sulfate, 3 g of Gatsuta percha, 3 g of lauric acid (special grade reagent) were melted and mixed evenly throughout the entire body at 120°C or less for 20 minutes, and the mixture was made into a material with a diameter of 3.5 mm and a length of 3.5 mm. The temporary sealant composition product of the present invention was manufactured by forming it into a small cylinder shape of 1100 ra.

Effects of the Invention Table 1 shows the sealability, compressive strength and operability evaluations of the compositions obtained in Examples 1.2.3.4 and 5 above. Table 2 shows the evaluation results and a comparison with the conventional technology.

Table 1: Evaluation of sealability, compressive strength, and operability in Examples Table 2: Comparison with conventional technology (Note) ☆J Is T-6602 applied mutatis mutandis (The outline of the measurement method is provided in this specification) The temporary sealing material composition obtained based on the above examples has high utility value because it is a temporary sealing material with excellent physical properties compared to the physical properties of stoppings obtained by conventional techniques.

Furthermore, the dental temporary sealing material composition of the present invention not only has excellent physical properties, but also has extremely high clinical application value because it is tasteless, odorless, and nonirritating.

The control products used for comparison in Table 2 above are representative compositions according to the prior art. their composition in the third
Shown in the table.

Table of Procedures Amendment (Note) * * Co-translated by Miura, Hayashi, Yodo, and Shio: Skinner Dental Materials Science
[Bottom] See page 454, Ishiyaku Publishing Co., Ltd., 1975, 4th edition * Edited by Japan Rubber Association: Rubber Industry Handbook, page 457, Japan Rubber Association, revised 1960, 3rd edition

Claims (6)

[Claims] (1) Shellac 20-70% by weight, resin 0-30% by weight
, metal oxides 10-70% by weight, fatty acids 3-10% by weight
and a thermally mixed cured product optionally containing 0 to 30% by weight of a contrast agent, which is softened with a flame or an appropriate heating means before use;
A dental temporary sealing material composition characterized by rapidly curing due to temperature drop after use. (2) The composition according to claim (1), wherein the resin is selected from the group consisting of rosin, a polymer of rosin, a hydrogenated product of rosin, and a molten mixture thereof. (3) The composition according to claim (1), wherein the metal oxide is selected from the group consisting of zinc oxide, magnesium oxide, and calcium oxide. (4) The composition according to claim (1), wherein the fatty acid is an organic saturated fatty acid, an organic unsaturated fatty acid, other fatty acids, or a mixture thereof with a melting point of 10 to 90°C. (5) The number of carbon atoms in the fatty acid is 12 to 24 and the general formula is C_
nH_2_n_+_1COOH, C_nH_2_n_-
_1COOH, C_nH_2_n_-_3COOH, C
_nH_2_n_-_5COOH, C_nH_2_n_
-corresponds to any one of 9COOH (where n is 12~
24) The composition according to claim 4. (6) The composition according to claim (1), wherein the contrast agent is selected from the group consisting of metals, metal salts, iodine compounds, and gutta-percha.