JPH06145020A - Crystal-forming dentine pretreating agent and its production - Google Patents

Abstract

PURPOSE:To provide a crystal-forming dentine pretreating agent intended to shorten filling technique by its application on the surface of the dentine irrespective of its kind following cutting off dental caries to produce more crystal and ensure bonding material coating and resin filling operation to be immediately initiated. CONSTITUTION:The pretreating agent comprising (A) a 1-35% aqueous potassium oxalate solution, (B) aluminum oxalate as metallic ion source and (C) an appropriate amount of 2% nitric acid for the purpose of promoting the rate of reaction with the dentine. Using this agent, new crystal is produced on the dentine. Thereby, steps in the filling technique from back operation to etching operation can be omitted, thus shortening the technique. Also, owing to the crystal produced, the dentin tubule is blocked; therefore, this agent can also be used for preventing the hyperesthesia after formation of vital tooth-supporting teeth, protecting dental pulp.

Description

DETAILED DESCRIPTION OF THE INVENTION (1) Field of application of dentistry The present invention provides a single layer of crystals on the surface of dentin to provide mechanical fitting to a dental filling composite resin or cement for cement, and also to ivory. It relates to the protection of dental pulp by the blockage of tubules.

(2) Conventional Technique Conventionally, when filling a dental filling composite resin into a tooth, an enamel composed of an inorganic substance is corroded with phosphoric acid to form a concave surface, and an acid for mechanical fitting is required. The erosion method is used. The enamel adhesion technique was established by this method. Recently, with the development of a new type of bonding material that is said to have adhesiveness to dentin, dentin containing a lot of organic substances is also corroded with phosphoric acid, and only chemical bond with the dentin is possible. A so-called total etching method has also been proposed which requires mechanical fitting instead. However, the clinical application of this method is still under discussion because of the fear of bacterial invasion due to the opening of dentin tubules due to acid treatment and the fear of acid pulp's dental pulp damage. . Currently, the technique that is said to be effective in improving the adhesion to dentin is, in addition to the conventional enamel acid treatment, cleaning of the dentin surface is performed separately, and further, dentin with a drug that strengthens dentin. It is a bonding system in which adhesive is applied and dental filling composite resin is filled after processing. However, since this method has not yet been moulted from the idea of acid treatment, the surgical procedure is complicated, and there is concern that the agent for strengthening dentin may damage the dental pulp, and it has not been widely applied.
Actually, in order to protect the dental pulp clinically, a method of further spreading dental cement and then filling the composite resin has been adopted.

(3) Problems to be Solved by the Invention Problems to be solved are as follows: Adhesion with dentin is still insufficient.

It is feared that acid corrosion of dentin to improve the adhesion with the tooth substance may be harmful to the pulp.

In order to protect the pulp, a method of laying a layer of dental cement and then filling it with a composite resin is used, but the operative method becomes long, and in some cases the color of the base cement appears to be transparent, so it is not aesthetic. . The present invention has been made to eliminate these drawbacks.

(4) Means for Solving the Problems The constitution of the present invention is liquid A (1% -35% potassium oxalate).
And a solution B (aluminum oxalate) as a metal ion source, which contains 2% nitric acid in an appropriate amount in order to accelerate the reaction rate with the tooth substance. The present invention has an idea contradictory to the conventional technique of obtaining microretention of a concave surface by acid treatment, which has been used for about 40 years. That is, this is a method of generating new crystals in the tooth substance and obtaining the microretention of the convex surface.

(5) Action The main component of the present invention is potassium oxalate, which reacts with calcium, which is the main component of tooth structure, to produce insoluble calcium oxalate. This reaction has a high reaction rate in the presence of nitric acid. The addition of aluminum oxalate (also ferric chloride, aluminum chloride, etc.) as a source of metal ions improves the wettability of the treated surface. When this pretreatment agent is applied to the cutting tooth surface, the particle size is 3-4 μm on the entire surface of the tooth structure.
More spherical precipitates of, especially in dentin,
This spherical precipitate is slightly larger than the diameter of the dentinal tubules, and when the dentinal tubules are blocked, they provide convex microretention. This layer of spherical precipitate did not fall off even after washing with ultrasonic waves for 10 minutes, and was strongly bonded to the tooth surface.

(6) Example Hereinafter, an example of the present invention will be described with reference to an electron microscope photograph. FIG. 1 shows a plan view of a cross section of a human tooth. More cutting debris remains on the cutting surface. It is said that this cutting waste is an inhibitor of adhesion. FIG. 2 shows the surface of dentin treated by the conventional acid treatment method (longitudinal section). It is clear that the dentinal tubules are opened and bacteria and stimulants pass through the opened dentinal tubules and adversely affect the pulp. FIG. 3 (plan view) and FIG. 4 (longitudinal section) show the surface of dentin treated with the inventive pretreatment agent. Spherical precipitates with a diameter of 3-4 μm were further deposited on the surface of dentin, and these spherical precipitates were slightly larger than the diameter of the dentinal tubules, blocking the dentin tubules and providing convex microretention. Figure 5 is a photograph of the surface of dentin treated with the pretreatment agent of the invention product after ultrasonic cleaning for 10 minutes. It was found that this layer of spherical precipitates did not fall off even when washed with ultrasonic waves, and was strongly bonded to the tooth surface. Fig. 6 shows the surface of enamel dentin treated with the pretreatment agent of the invention. Is shown. It shows that one layer of crystals is formed on the surface of dentin regardless of enamel (left side) and dentin (right side).

(7) Effects of the invention Since the tooth substance is not treated with acid, there is no fear of exposing dentinal tubules.
On the contrary, it is expected that the capillaries will be blocked by the newly generated crystals. After cutting caries, the entire cavity (enamel, dentin)
Then, the crystal-forming tooth substance pretreatment agent of the present invention is applied, and immediately, the bonding material application and the resin filling operation are started. In other words, the steps from the lining operation to the etching operation in the conventional filling operation are not required, and the operation can be shortened at a stroke. Further, it is considered that the generated crystals block the dentinal tubules and can be applied to prevent hypersensitivity after the formation of vital tooth abutment teeth.

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[Procedure amendment]

[Submission date] August 20, 1993

[Procedure Amendment 2]

[Document name to be amended] Statement

[Name of item to be amended] Title of invention

[Correction method] Change

[Correction content]

Title: Crystallizable tooth substance pretreatment agent and manufacturing method

[Procedure Amendment 5]

[Document name to be amended] Statement

[Name of item to be corrected] Brief description of the drawing

[Correction method] Change

[Correction content]

[Brief description of drawings]

FIG. 1 Cutting surface of a tooth (magnification of 2000 times). It is covered with a smear layer.

FIG. 2 shows a dentin surface treated with 37% orthophosphoric acid for 30 seconds (magnification: 5000 times).

FIG. 3 is a surface obtained by treating a tooth cutting surface with a pretreatment agent for 30 seconds. One more spherical product was deposited (expansion rate 2000 times).

FIG. 4 is a longitudinal section of FIG. 3 (magnification of 2000 times). The dentinal tubules are blocked by the spherical products.

FIG. 5 is an image (magnification of 2000 times) after treatment with a pretreatment agent for 30 seconds and ultrasonic cleaning for 10 minutes. 10 with ultrasound
After washing for a minute, the spherical product does not fall off.

FIG. 6 shows enamel treated with a pretreatment agent (left side of the photograph) and dentin (right side of the photograph) (magnification: 5000 times). Spherical products are produced more regardless of enamel or dentin.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yoshio Xiao 2-2-403 Kintori-cho, Kokurakita-ku, Kitakyushu-shi, Fukuoka Prefecture (72) Masamichi Terashita 2-1-601 Kinjicho, Kita-ku-ku, Kitakyushu, Kitakyushu, Fukuoka Prefecture (72) 72) Inventor Naohiro Kono 1730-6 Kamikai, Nogata, Fukuoka Prefecture

Claims (1)

[Claims] A treatment agent for producing a single crystal on the surface of dentin without removing enamel and dentin, and a method for producing the same.