JP2605575Y2 - Covered denture - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a denture.

[0002]

2. Description of the Related Art Conventionally, in order to manufacture a denture with a floor, a working model is prepared, and artificial teeth made of synthetic resin, porcelain, etc. are arranged on the working model, and gums are formed by forming gums. This is primarily buried in the lower flask, the upper and lower flasks are set and the second buried, the gypsum is hardened and the wax is melted and discharged to form a gypsum mold, and the resin is filled through the sprue into the gypsum mold cavity. Then, the gypsum is crushed, the molded product is taken out, and finished. In this case, a method of burying gypsum at one time is also performed, and injection molding, transfer molding, and the like are known as methods of filling a resin in a gypsum mold.

[0003]

In the prior art described above, when the thickness of the alveolar ridge is extremely large, a depression such as a sink occurs on the mucous membrane surface of the alveolar ridge due to resin molding shrinkage or the like. However, there is a problem that air bubbles that are inward sinks are formed inside the alveolar ridge portion or the like. In addition, there is a problem that sinks may occur in sprue connection parts such as the maxillary nodule and the mandibular posterior triangle for the same reason.

[0004] Therefore, an object of the present invention is to provide a denture with a denture that can suppress the occurrence of sink marks.

[0005]

According to the present invention, a denture prevention material is provided in a thick portion of a denture base.

[0006]

According to the present invention, the thickness of the resin molding is reduced by the amount of the sink preventing material, and the sink is prevented.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the accompanying drawings. 1 to 3 show a first embodiment of the present invention,
In a thick portion 2 such as an alveolar ridge portion of a resin denture base 1, a synthetic resin sink preventing material 3 is provided. The anti-sink material 3 has an artificial tooth 4 as shown in FIG.
The cross-sectional area is approximately the width of the artificial tooth 4 as shown in FIG. 1, and is adhered to the lower portion of the synthetic resin artificial tooth 4 as shown in FIG. It is fixed with agent 5. The anti-sink material 3 is attached to the artificial tooth 4 fixed to the upper gypsum mold 6 after the wax is discharged, and thereafter the cavity 9 is formed by the upper gypsum mold 6 and the lower gypsum mold 8 having the working model 7.
Is formed and the denture base 1 is formed by filling the resin.

As described above, in the present embodiment, since the anti-shrink material 3 is provided in the thick portion 2 such as the alveolar ridge portion, the resin of the thick portion 2 is formed in accordance with the size of the anti-shrink material 3. The thickness of molding is reduced, and the occurrence of sink marks due to resin molding shrinkage is suppressed. In addition, thick part 2 such as alveolar ridge
The difference in the molding thickness between the palate portion 12 and the palate portion 12 is small, so that the variation in the molding shrinkage of the resin is small and uniform, and sinkage can be suppressed. Further, the melted resin that has flowed into the cavity 9 is absorbed by the unheated shrinkage preventive material 3 and is quickly cured with the shrinkage preventive material 3 as a core, so that sinking can be more effectively suppressed.

FIG. 4 shows a second embodiment of the present invention, in which the same parts as those in the first embodiment are denoted by the same reference numerals and the description of the same parts is omitted. Instead of being fixed to the base 4, a hole 10 is formed in the working model 7 of the lower gypsum mold 8, and the anti-sink material 3 is erected through a synthetic resin pin 11. 3, the molded thickness of the thick part 2 is reduced, and the part is rapidly cured with the sink prevention material 3 as a core, so that sink can be suppressed.

The present invention is not limited to the above-described embodiment, and various modifications can be made within the scope of the present invention. For example, in the anti-sink material, its shape and size can be appropriately selected within a range where the thickness can be appropriately contained in a thick portion such as the alveolar ridge portion and the sink can be suppressed, preferably in consideration of color tone and formability. As shown in FIG. 2, a gap H between the end surface of the sink preventive material 3 and the inner surface of the upper gypsum mold 6 is selected in a range where at least 1 mm can be secured. The material may be a resin, a composite resin such as glass fiber, a metal, a porcelain, or the like, and by selecting a material excellent in strength, an effect of reinforcing the denture base can be obtained. The means for attaching the anti-sink material may be selected from the second embodiment. The anti-sink material may be attached to the artificial tooth by making a hole in the artificial tooth and using a pin made of an appropriate material. As another example, the anti-sink material may simply be placed in place in the cavity. Further, according to these attaching means, the artificial tooth can be applied to a material other than resin such as porcelain. As a material of the denture base, a polymer resin such as a polysulfone resin, a fluorine resin, an acrylic resin, a polycarbonate resin, a polyamide resin, a styrene resin, a polyurethane resin, and a polyacetal resin is preferable, but not limited thereto. Further, although the illustrated denture has an upper complete denture, the present invention can be applied to all forms such as a lower complete denture and a local denture. The number of places where the anti-sink material is fixed to the artificial tooth or the plaster mold may be selected according to the length of the anti-sink material. In addition, there are injection molding, transfer molding, and compression molding in which sheet-shaped thermoplastic resins are superimposed while being heated by far infrared rays or the like, and the dentures are compressed and molded using a plaster mold. It can also be applied to hot polymerized resins. These molding methods are less likely to cause sink marks than the injection molding method and the transfer molding method, but the application of the present invention can further solve the problem of sink marks. In addition, by applying the present invention to each molding method, the difference in molding thickness between the alveolar ridge portion and the palate portion is reduced, so that the variation in molding shrinkage of the resin is reduced, so that sink can be suppressed, and the resin filled in the cavity can be suppressed. The amount is reduced, which is advantageous for molding.

[0011]

According to the present invention, the provision of a denture prevention material in the thick part of the denture base can provide a denture with a denture which can suppress the occurrence of sink marks.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a first embodiment of the present invention.

FIG. 2 is a sectional view showing the first embodiment of the present invention.

FIG. 3 is a plan view showing the first embodiment of the present invention.

FIG. 4 is a sectional view showing a second embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Denture base 2 Thick part 3 Anti-sink material 4 Artificial tooth

Claims (1)

(57) [Scope of request for utility model registration] 1. A denture having a prosthesis provided in a thick portion of a denture base.