JPS6337082B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a surface coating material for a polymerization-curable dental resin restorative material, which is susceptible to polymerization inhibition by oxygen in the air.

In recent years, dental resin restorative materials that use acrylic monomers, such as composite resins and resin cements, have come into widespread use, but acrylic monomers are inhibited from polymerization by oxygen in the air, so There was a problem that the surface of the filler material was not sufficiently cured. For composite resin restoration of class 5 cavities in anterior teeth, if pressure is applied with strips,
Although it is possible to harden the surface almost completely, pressure bonding of strips is not possible on complex surface shapes such as the occlusal surface of molars and cement margins, and a different technique has been desired.

The inventors came up with the idea that the above problem could be solved by applying a paste to the surface of the filler to cut off the contact between oxygen and the filler and completely harden the surface, and tried various materials. . As a result, we found that a paste consisting of two types of polyethylene glycol, one with a low molecular weight and one with a high molecular weight, has an excellent oxygen shielding effect, is easy to apply to the surface of the filling material or the adhesive interface, and has the advantage of being easy to wash away with water in the oral cavity. This heading led to the present invention.

The present invention uses 100 parts by weight of low molecular weight polyethylene glycol with an average molecular weight of 150 to 420 and an average molecular weight of 1,800 parts by weight.
~20000, preferably 3000-10000 high molecular weight polyethylene glycol 20-200 parts by weight, preferably
This is a surface coating material for completely hardening the surface of dental resin restorative materials, which is made by mixing 50 to 150 parts by weight into a paste. The surface coating material of the present invention is produced by mixing the two types of polyethylene glycols mentioned above, heating and dissolving them to make a homogeneous solution, and then cooling this solution to room temperature while stirring to precipitate the high molecular weight polyethylene glycol, resulting in a solid-liquid mixed system. It can be prepared by making it into a paste form.

In the present invention, it is important that the surface coating material be obtained in the form of a paste with poor fluidity. A dental resin restorative material is filled into a tooth cavity and cured, and the tooth cavity exists in various positions of the tooth. Therefore, the surface of the filled resin becomes an inclined surface,
It becomes a vertical surface. In order to coat such surfaces, the surface coating material needs to be in the form of a paste with poor fluidity even when heated in the oral cavity, so that it can be applied thickly to the surface, blocks air,
It must be of a type that allows complete polymerization and curing. In the present invention, the purpose of mixing two types of polyethylene glycols having a specific average molecular weight as described above is to obtain such a paste, and the amount of high molecular weight polyethylene glycol to be mixed is
20 parts by weight or less (low molecular weight polyethylene glycol)
100 parts by weight), the fluidity is too high to apply to the resin surface, and conversely, if it exceeds 200 parts by weight, the paste becomes hard and difficult to apply.

The surface coating agent of the present invention essentially consists of the above-mentioned two types of polyethylene glycols having different molecular weights, but other additives may be added as long as the object of the present invention is not impaired. These additives include coloring agents such as various dyes and pigments, water, ethanol,
Examples include solvents such as ethylene glycol and glycerin, solid contents such as higher alcohols, fatty acid esters, polyvinyl alcohol, cellulose powder, and silicic anhydride.

The surface coating agent of the present invention prepared as described above can be applied to various polymerization-curable dental resin restorative materials. Such a restorative material is filled into the tooth cavity and hardened, but after filling, by applying the surface coating agent of the present invention to the surface of the resin restorative material, the surface portion is isolated from air, so that hardening is not complete. becomes. As a result, the weak layer on the resin surface that is formed due to poor curing, which occurs in conventional methods that do not use such coating agents, will not fall off due to friction, etc., and the surface coating agent of the present invention will not This enables filling repair with excellent surface hardening.

The preparation method, usage, and effects of the surface coating agent of the present invention will be explained in detail below using Examples and Comparative Examples.

Example 1 Polyethylene glycol 400 (average molecular weight 380~
420) and 50 g of polyethylene glycol 4000 (average molecular weight 3000-3700) were placed in a glass container and heated to 65°C to form a homogeneous solution. This solution was allowed to cool to room temperature while stirring to obtain a paste.

A cavity with a diameter of 4 mm was formed on the labial surface of the anterior teeth of the cow, and commercially available composite resin "ClearFil SC" was injected into the cavity.
" was filled. Immediately after filling, the surface coating agent described above was applied to the composite resin surface using a dental syringe. Three minutes after application, the protectant was carefully rinsed with water and the composite resin surface was rubbed with a hand cutter to reveal that it was completely cured.

Comparative Example 1 A cavity with a diameter of 4 mm was formed on the labial surface of a bovine anterior tooth, and commercially available composite resin ``Clear Film SC'' was injected into the cavity.
" was filled. The surface of the composite resin in the curing process was not coated with the coating agent, and was allowed to stand for 4 minutes after filling. After carefully rinsing with water, the surface of the composite resin was rubbed with a hand cutting tool, and it was found that the surface layer was poorly cured and easily scratched.

Claims (1)

[Claims] 1. A surface for completely hardening the surface of a dental resin restorative material, which is made by mixing 100 parts by weight of polyethylene glycol with an average molecular weight of 150 to 420 and 20 to 200 parts by weight of polyethylene glycol with an average molecular weight of 1800 to 20,000 in paste form. Coating agent.