JP2678952B2 - Dental space forming material - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a denture by using a curable material as a molding die and compression-molding a thermoplastic resin to easily form a space for discharging excess resin. A non-hardening dental space forming material that can be used.

[0002]

2. Description of the Related Art As a method of forming a mold using a curable material, for example, in a dental technique, there is a method of forming a mold for denture using gypsum. The most common method of making acrylic dentures is to put a dough-like mixture of acrylic monomer and acrylic polymer in a plaster mold and repeat the test pressure operation until the optimal amount of dough is reached. A method of producing a denture by removing excess dough, then heating the dough by combining the upper and lower gypsum molds and polymerizing the acrylic monomer is adopted. In such a manufacturing method, it is not necessary to provide a space for discharging excess resin in the compression mold.

However, JP-A-59-189838
When manufacturing a denture by compression molding a thermoplastic resin as described in Japanese Patent Laid-Open No. 1-244744 or Japanese Unexamined Patent Publication No. 1-244744, excess resin is removed by a trial pressure operation as in the case of manufacturing an acrylic floor denture. However, it is necessary to finish molding by pressing once and manufacture a denture. Therefore, in a mold similar to the case of making acrylic floor dentures, excess resin enters between the upper and lower molds during compression molding to form a thick burr, and as a result, the denture has a high occlusion and a thick floor. Will end up.

Therefore, in JP-A-60-242850, when an upper and lower gypsum-based molding die used for compression molding is manufactured, an elastic sheet material is inserted between the upper and lower molding dies and the molding die is cured. After that, a method is disclosed in which the resin is removed and the excess resin at the time of compression molding is discharged to the formed space. Further, in Japanese Patent Laid-Open No. 1-37948, a room temperature curable inorganic material is used to form a discharge space for excess resin.

When a compression molding die is made of a material having a small bending strength such as a gypsum-based material, the molding die is compressed by the compression molding pressure at the boundary between the molded product and the excess resin, that is, near the burr portion. It should be considered to discharge the excess resin, taking special care not to damage it. Therefore, although the above method is considered,
With the method of inserting the elastic sheet-like material, it is difficult to adjust the shape of the burr cutting part that requires delicate adjustment, and with the method of using the room temperature curable material, it is difficult to efficiently incorporate this space forming step during the denture manufacturing step. . Considering these points,
We tried a method of forming a space by clay, which is a non-hardening material. With this method, although the restrictions on the working process when using a room temperature hardening material were improved, in the wax wax process Clay dissolves in hot water, adheres to the molding die or peripheral equipment and stains, and it takes a long time to remove them, which is a problem.

[0006]

DISCLOSURE OF THE INVENTION The present invention provides a proper compression space for a surplus resin in a compression mold made of a room temperature curable material when manufacturing a denture by a compression molding method using a thermoplastic resin. The present invention relates to a dental space forming material for efficiently forming and without any restrictions in the process.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION The dental space forming material of the present invention is a non-hardening plastic material formed by mixing a hydrophobic liquid material with an inorganic powder. The hydrophobic liquid material is not particularly limited as long as it is a liquid material that does not elute in hot water and does not evaporate at the temperature of hot water. However, in the case of manufacturing a medical device such as a denture, silicone resin, silicone oil, silicone grease and the like are preferable in consideration of hygiene.

As the inorganic powder to be mixed, any substance which does not deteriorate the liquid substance and is hardly soluble in water can be used. Examples of such inorganic powder include powders of silica, calcium carbonate, calcium silicate and the like.

As the liquid material, those having a high viscosity are preferable to those having a low viscosity, and those having a viscosity range of about 100 to 10,000 poises are desirable. The particle size of the inorganic powder is preferably 150 microns or less, and particularly preferably 50 microns or less. Mixing ratio P of liquid substance (P) and inorganic powder (L)
Although / L can vary greatly depending on the viscosity of the liquid material or the particle size of the inorganic powder, the range is preferably P / L = 1 to 1/5, and particularly about 1/2 to 1/4.

[0010]

The present invention will be described in more detail with reference to the following examples. Example 1 To 10 parts of silicone oil (viscosity = 100 poise), 30 parts of calcium carbonate (average particle size = 45 μm) was added and kneaded to obtain a uniform clay-like space forming material.
A wax dental prosthesis manufactured according to a conventional method for dentistry was primary-embedded in a flask using plaster, and after the primary embedding material was hardened, an embedding space for discharging an excess resin was formed by the space forming material. The space material had good elongation, did not deteriorate during the work, and could be pressed smoothly from the outer peripheral part of the flask to the burr cut part. Subsequently, secondary embedding was performed with gypsum, and after the secondary embedding material was hardened, the flask was placed in hot water to soften the wax and divide the flask into upper and lower parts. The space forming material was removed from the mold, and the mixture was further waxed with hot water to prepare a compression mold for making a denture. As a result, a good mold with high dimensional accuracy was obtained, and the space forming material could be recovered without any change in quality.

Example 2 To 10 parts of a silicone resin (viscosity = 1500 poise), 25 parts of silica sand (average particle size = 100 microns) was added and kneaded, and this material was used to prepare a denture as in Example 1. A compression mold was produced. As a result, a good molding die with high dimensional accuracy was obtained, and the space forming material could be recovered without deterioration.

Example 3 To 10 parts of silicon grease (viscosity = 250 poise), 20 parts of quartz powder (average particle size = 50 μm) was added and kneaded. Using this material, a compression mold for dentures was produced in the same manner as in Example 1. As a result, a good molding die with high dimensional accuracy was obtained, and the space forming material could be recovered without deterioration.

[0013]

EFFECTS OF THE INVENTION The use of the dental space forming material of the present invention makes it possible to efficiently provide a proper space for discharging excess resin to a compression mold made of a room temperature curable material, and to obtain any process. It is possible to form without any restriction, and it is possible to obtain an excellent dental mold with high dimensional accuracy.

Claims (1)

(57) [Claims] 1. A non-curable dental space forming material obtained by mixing a hydrophobic liquid material with an inorganic powder.