JPH05163111A - Pretreating agent for dental use - Google Patents

Abstract

(57) [Summary] [Structure] A dental pretreatment agent comprising an aqueous solution of an organic carboxylic acid and iron phosphate. [Effect] The dental pretreatment agent of the present invention can be pretreated without causing pain to a patient. Further, when the dental pretreatment agent of the present invention is used, the adhesion between the dentin portion and the restoration and the adhesion between the enamel portion and the restoration can be strongly performed with only one liquid. Furthermore, the dental pretreatment agent of the present invention does not cause discoloration of teeth, and is therefore excellent in aesthetics.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to a dental pretreatment agent. More specifically, the present invention relates to a dental pretreatment agent which is mainly used for pretreating a tooth surface in advance in adhering a tooth to a restoration made of a metal material, an organic polymer material, a ceramic material or the like.

[0002]

2. Description of the Related Art In bonding a tooth with a restoration made of a metal material, an organic polymer material, a ceramic material, etc., a tooth pretreatment agent (hereinafter simply referred to as "pretreatment It is also widely performed.

The pretreatment agent generally used as the pretreatment agent is an aqueous solution of phosphoric acid. With this phosphoric acid aqueous solution, it is possible to remove the smear layer that is generated when the tooth is cut and inhibits the adhesion between the tooth and the restoration.

[0004]

However, when the phosphoric acid aqueous solution is used as the pretreatment agent, the following problems occur. That is, from the surface of the cavity created by cutting the tooth, especially from the surface of the cavity in the dentin portion, the phosphoric acid aqueous solution permeates into the tooth through the dentinal tubule and communicates with the dental pulp. There is a problem in that the patient feels pain by stimulating nerves called "," and that the adhesive strength between the dentin portion and the restoration is low.

Of these problems, the former is considered to be caused by the removal of the smear layer and the plugging material at the entrance of the dentinal tubule, so-called dentinal plug, caused by cutting the tooth, by the phosphoric acid aqueous solution. ..
On the other hand, the latter problem is that the smear layer and the dental plug are removed as described above, and the body fluid exudes from the dentinal tubules, and the exuded body fluid inhibits the adhesion between the dentin portion and the restoration, in particular. It is believed to be caused by.

Therefore, the development of a pretreatment agent capable of pretreating teeth while leaving the dental plug is an issue.

As a pretreatment agent already proposed, there is a pretreatment agent comprising an aqueous solution of an organic carboxylic acid such as citric acid, oxalic acid or ethylenediaminetetraacetic acid. When the pretreatment agent composed of this aqueous solution of organic carboxylic acid is used, the above-mentioned dentinal plug remains in some extent, and the patient's pain is relieved. However, the smear layers present on the surface of the cavity in the dentin portion and the surface of the cavity in the enamel portion are not completely removed, and the adhesive strength between the tooth and the restoration is low.

In order to solve this problem of adhesive strength, a pretreatment agent has been proposed in which citric acid is selected as the organic carboxylic acid and ferric chloride is further added to an aqueous solution of this citric acid. (Dental Materials Instrument, Vol. 1, p. 131 (1982).) It is true that the use of a pretreatment agent prepared by further mixing ferric chloride with this aqueous solution of citric acid produces dentin parts of teeth and restorations. The adhesive strength of can be increased.

However, even if a pretreatment agent prepared by mixing ferric chloride with the above aqueous solution of citric acid is used, the adhesive strength between the tooth enamel portion and the restoration is not sufficient. Further, since ferric chloride is mixed, the tooth after pretreatment, especially dentin, is discolored, which is a problem in terms of aesthetics.

The problem of the adhesive strength between the enamel portion and the restoration in the case of using the pretreatment agent prepared by blending ferric chloride in the aqueous solution of citric acid is that the enamel portion is previously treated with the phosphoric acid. It can be solved by treating with an aqueous solution. However, in this case, the pretreatment is a two-step complicated work of pretreatment with an aqueous phosphoric acid solution and pretreatment with an aqueous solution of citric acid mixed with ferric chloride, which is not practical.

Therefore, the adhesion between the dentin portion and the restoration and the adhesion between the enamel portion and the restoration can be strongly achieved with only one liquid, and the patient does not feel any pain when using the pretreatment agent. However, the development of a pretreatment agent that does not discolor teeth is an issue.

[0012]

Means for Solving the Problems The inventors of the present invention have made various studies as a pretreatment agent, and as a result of diligent research, as a result of using a dental pretreatment agent composed of an aqueous solution of an organic carboxylic acid and iron phosphate, The inventors have found that the above problems can be solved and completed the present invention.

That is, the present invention is a dental pretreatment agent comprising an aqueous solution of an organic carboxylic acid and iron phosphate.

As the organic carboxylic acid in the present invention,
Known organic carboxylic acids can be used without limitation. Examples of the organic carboxylic acid include formic acid, acetic acid,
Lactic acid, butyric acid, valeric acid, hexanoic acid, lauric acid, pyruvic acid, glycic acid, methacrylic acid, acrylic acid, crotonic acid, monocarboxylic acids such as benzoic acid, oxalic acid, succinic acid, tartaric acid, glutaric acid, fumaric acid, Dicarboxylic acids such as maleic acid, malonic acid, citraconic acid and itaconic acid, tricarboxylic acids such as citric acid, trimellitic acid and trimesic acid, and tetracarboxylic acids such as ethylenediaminetetraacetic acid may be used alone or in combination of two or more. can do.

In the present invention, the concentration of the organic carboxylic acid is not particularly limited, but is preferably 5 to 50% by weight, more preferably 5 to 30% by weight, based on the aqueous solution of the organic carboxylic acid and iron phosphate. Is.

As the iron phosphate in the present invention, known iron phosphate can be used without limitation. As the iron phosphate, for example, ferrous phosphate, ferric phosphate, etc. may be used alone or in combination of two or more.

In the present invention, the concentration of iron phosphate is not particularly limited, but is preferably 0.5 to 30% by weight, more preferably 0.5 to 10% by weight based on the aqueous solution of organic carboxylic acid and iron phosphate. % By weight.

The dental pretreatment agent of the present invention is blended with a polymer compound such as polyvinylpyrrolidone, carboxymethylcellulose, polyvinyl alcohol or the like, and a viscosity controlling agent such as highly dispersible silica or the like in order to adjust the viscosity as required. can do. Further, the tooth surface treating agent of the present invention may contain an edible pigment as a coloring material.

[0019]

The dental pretreatment agent of the present invention can be pretreated without causing pain to the patient. Further, when the dental pretreatment agent of the present invention is used, the adhesion between the dentin portion and the restoration and the adhesion between the enamel portion and the restoration can be strongly performed with only one liquid. Further, the dental pretreatment agent of the present invention does not cause discoloration of teeth, and is therefore excellent in aesthetics.

[0020]

EXAMPLES The dental pretreatment agent of the present invention will be specifically described below with reference to examples, but the present invention is not limited to the examples.

Examples 1 to 6 and Comparative Examples 1 to 4 Adhesion tests were conducted as follows using the pretreatment agents having the compositions shown in Table 1.

First, the bovine anterior tooth within 24 hours after slaughter is extracted, and the enamel plane or dentin plane of the bovine anterior tooth is removed.
It was carved with 800 emery paper. This enamel plane or dentin plane was treated with a pretreatment agent having the composition shown in Table 1 for 10 seconds. Then, the pretreated enamel plane or dentin plane was washed with water and dried, and then a double-sided tape having a hole of 4 mm in diameter was attached to the enamel plane or dentin plane.

Separately, paste I and paste having the compositions shown in Table 2 were prepared. Next, the paste I and the paste II were mixed in equal weight, and the mixture of the paste I and the paste II was used as an adhesive agent to bond the stainless rod to the enamel plane or the dentin plane. After 1 hour, the bovine tooth was immersed in water at 37 ° C. for 24 hours while the stainless steel rod was adhered to the enamel plane or the dentin plane.
Then, the bovine tooth was taken out from the water, and the adhesion strength between the enamel plane or the dentin plane and the stainless steel rod was measured with a tensile tester (crosshead speed: 10 mm / min). Table 3 shows the measurement results.

[0024]

[Table 1]

[0025]

[Table 2]

[0026]

[Table 3]

Examples 7 to 8 and Comparative Examples 5 to 7 In the same manner as in Example 1, bovine dentin planes were carved out. This dentin plane was treated with a pretreatment agent having the composition shown in Table 4. The state of the dentin plane after the treatment was observed with a scanning electron microscope (SEM). Further, the presence or absence of discoloration of the teeth was visually observed. The results of these observations are shown in Table 5.

[0028]

[Table 4]

[0029]

[Table 5]

Claims (1)

[Claims] 1. A dental pretreatment agent comprising an aqueous solution of an organic carboxylic acid and iron phosphate.