JPS59128330A - Dental acid treatment - Google Patents

Abstract

PURPOSE:A dental acid treatment applicable uniformly to restorative dental materials, having adhesivity, obtained by dissolving polyvinyl pyrrolidone having a specific k value in an aqueous solution of phosphoric acid or carboxylic acid in a specified ratio. CONSTITUTION:5-100pts.wt., preferably 10-80pts.wt. polyvinyl pyrrolidone having 15-60k value is dissolved in 100pts.wt. 5-80wt% aqueous solution of phosphoric acid or carboxylic acid, to give a dental acid treatment having increased viscosity. The addition of polyvinyl pyrrolidone as a thickening agent provides the titled treatment having improved viscosity increasing effect and storage stability. It is applicable uniformly to restorative dental materials, and the surface of the teeth can be treated uniformly by pushing the materials to the surface of the teeth. It is directly applicable to the surface of the teeth, and it has effects to etch only the surface of the teeth to be treated since it is thickened.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a dental acid treatment agent that etches the tooth surface to create fine irregularities on the tooth surface in order to effectively apply adhesive to the tooth surface in dental treatment. .

Recently, adhesives have been developed that exhibit adhesive strength and water resistance for dental alloys, and these adhesives are enabling new techniques such as the restoration of missing teeth with bonded bridges and the fixation of loose teeth. All of these treatment techniques involve bonding a metal casting over a large area to the tooth's enamel surface.

For example, in the case of an adhesive bridge, the metal retaining part of the pontic is bonded to almost the entire surface of the two or four teeth of both M'l of the missing tooth. When adhering, the conventional method is to apply acid treatment to the enamel surface in advance to obtain a bonding strength, but the conventional method of applying acid treatment agent to the enamel surface with a small brush does not work. , if the area to be treated is large,
Discrepancies in processing time for each part are unavoidable. Therefore, it is extremely difficult to acid-treat the entire surface uniformly.

The present inventors believe that in order to uniformly acid-treat a large area, it is possible to apply an acid filler to the surface to be adhered to the metal casting, press it against the enamel surface to be bonded, and then apply the acid treatment. We came up with the idea that the entire surface could be treated uniformly under the same conditions, and investigated acid treatment agents suitable for this purpose. As a result, even when an aqueous solution of phosphoric acid or carboxylic acid (e.g. citric acid) that does not contain polymer components, which is normally used for acid treatment of denture enamel, is applied to the surface of a metal casting, it does not wet well and is not uniform. However, it has been found that when a water-soluble polymer is added to the acid aqueous solution to increase its viscosity, it becomes sticky and can be applied uniformly to the metal surface. So, when we looked into various water-soluble polymers, we found that when polyethylene glycol and polycarboxylic methyl cellulose, which have ether bonds in their molecular main chains, are referred to as acid aqueous solutions, the ether bonds are hydrolyzed during long-term storage, resulting in a decrease in viscosity. was found to decrease. Although polyvinyl alcohol does not have to worry about hydrolysis, it is not preferable because the polymer may become insolubilized under high temperature conditions such as during transportation in the summer. The present invention was completed after recognizing that polyvinylpyrrolidone is the most excellent in terms of thickening effect and storage stability.

The acid treatment agent of the present invention is 5 to 80% of Harinryu or carboxylic acid.
It is a high viscosity acid aqueous solution thickened by adding 5 to 100 ffi parts, preferably 10 to 80 ffi parts, of polyvinylpyrrolidone having a k value of 15 to 60 to 100 ffi parts of the heavy-lid% aqueous solution.

In the acid treatment agent of the present invention, any phosphoric acid or carboxylic acid conventionally used in dental acid treatment agents can be used. Phosphoric acid includes phosphoric acid, pyrophosphoric acid,
As the carboxylic acid, citric acid, lactic acid, malic acid, malonic acid, etc. are preferably used. The aqueous solution concentration of these acids is required to be in the range of 5 to 80% by weight in order to achieve acid treatment effects. Outside this range, the etching effect on the tooth surface will be insufficient. Next, polyvinylpyrrolidone, which is added as a thickener to the acid aqueous solution, has a value of 15 to 60 (average molecular weight 10,000 to 160,0
00). If the k value is less than 15, the thickening effect will be insufficient, and if the k value exceeds 60, the stringiness will be extremely strong and the operability will be poor. Further, in order to obtain appropriate thickening properties, the amount of polyvinylpyrrolidone added needs to be 5 to 100 parts per 100 parts per 100 parts of the acid aqueous solution.

In addition, in the acid treatment agent of the present invention, fine powder silica, which is known to be added to the acid treatment agent as a thickener (it does not have sufficient adhesiveness alone), may be used in combination with the above polyvinylpyrrolidone. It is possible to use it. It is also possible to add a water-bathable organic solvent such as glycerin or propylene glycol or a dye as a modifier for the acid treatment agent.

The acid treatment agent of the present invention prepared as described above can be uniformly applied to a dental restorative member applied to a tooth surface. Therefore, by pressing the coated member against the tooth surface, it becomes possible to uniformly acid-treat the tooth surface.

In addition, the acid treatment agent of the present invention has the same properties as the commonly used acid treatment solution.
It can also be applied directly to the tooth surface. Since the viscosity is thickened, it is possible to etch only the tooth surface to be treated, and it has the effect that it does not flow out to other areas.

The present invention will be explained in more detail with reference to Examples below.

Example A viscous acid treatment solution was obtained by mixing and dissolving 47 parts by weight of orthophosphoric acid, 26 parts by weight of water, and 30 parts by weight of polyvinylpyrrolidone (k value: 50). When I applied it to the surface of a flat plate, I found that it was possible to apply it evenly, but it was messy. This flat plate was pressed against bovine front tooth enamel, treated with acid for 1 minute, washed with water, and a commercially available composite resin [Clearfil F-cho] was adhered to the nucleic acid-treated surface. Adhesive specimen at 57℃
The tensile adhesive strength was measured after being immersed in water for one day.
7 kg/cJ, indicating sufficient adhesive strength. Further, the present acid treatment agent was heated to 70° C. for one week, but no decrease in viscosity was observed and it was stable.

Furthermore, in the case of the above acid treatment solution to which polyvinylpyrrolidone was not added, the flat plate surface of the Ni-0r alloy could not be rendered uniform, and the tooth surface could not be etched as described above.

Patent applicant Ri Rashi Co., Ltd. Substitute Patent Attorney Ken Honda

Claims (1)

[Claims] A dental acid which is thickened by dissolving 5 to 100 parts by weight of polyvinylpyrrolidone with a k value of 15 to 60 in 100 parts of a phosphoric acid or carboxylic acid water bath solution with a degree of production of 5 to 80%. Processing agent.