JPH021502B2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to a method for manufacturing a denture base.

Conventionally, to manufacture this type of denture, a plaster mold was created using an impression, a wax model was created from the plaster mold, and this was replaced with synthetic resin to create a denture base.

However, with this manufacturing method, accurate products can be obtained for working models such as wax, but
Errors may occur due to indirect operations leading to model production, such as dimensional changes due to shrinkage and expansion due to operations during impression acquisition, impression materials, and materials such as wax and plaster used in the process of making working models, resulting in poor clinical suitability. At the same time, it also had the disadvantage of not being suitable for mass production.

By the way, the conventional concept of a denture base is to accurately adhere to the maxillary and maxillary mucosal surfaces in the oral cavity, restore the physiological function of mandibular joint movement, and at the same time restore the occlusal function by following the motor function of each masseter muscle without any hindrance. However, with the recent development of clinical dentistry, we have focused on the development of technology for restoring the adhesion precision of the closed mucosal surface around the periphery of a denture. The aim is to solve the above-mentioned drawbacks by making it possible to correct the size of various occlusions and forms by determining the size of the bed and then performing the floor replacement work by oneself. The master model was prepared by preparing the occlusion of the upper and lower jaws of the denture base, and the above master model was created so as not to leave any undercuts between the artificial teeth and the buccal, palatal, or lingual parts. A mold is made to match the divided body of the divided denture base, and the mold is used to injection mold the divided body from synthetic resin, and then the synthetic resin divided body, which is the artificial tooth part, buccal part, and A prototype of the denture base is manufactured by integrating the palatal or lingual side with adhesive, etc., and a denture base material is attached to the prototype, and the denture is placed in the oral cavity and tested directly. The purpose is to remove the protruding part of the filling material, and by using the precision of injection-molded artificial teeth, the artificial tooth root at the bottom of the artificial tooth's crown and the artificial tooth root socket provided on the floor side are bonded with adhesive. This made it possible to mass produce the floor part.

Next, embodiments will be described based on the accompanying drawings.

A master model (not shown) is created by academically adjusting the occlusion of the upper and lower jaws of the denture base, and this master model is used for the buccal part, the artificial tooth part, and the palatal or lingual part. A mold (not shown) is made to fit the divided parts while avoiding the undercut, and the mold is used to mold the synthetic resin buccal parts 1, 11, artificial tooth parts 3, 13, and palatal part according to the master model. The portion 2 and the tongue side portion 12 are each injection molded and then integrated by gluing or the like.

First, the manufacturing method of maxillary denture bases will be explained with reference to Figures 1 to 4. As shown in Figure 1, prototypes of standardized synthetic resin split denture bases with different colors, dimensions, shapes, and at least dimensions are shown. A large amount of ready-made products of a buccal side part 1, a palatal side part 2, and an artificial tooth part 3, which are obtained by dividing the body into various parts, are prepared by injection molding of synthetic resin using a mold.

In addition, the buccal side part 1 and the palatal side part 2 are formed with appropriately shaped coupling unevenness parts 4, and the buccal side part 1 and the palatal side part 2 are formed with the root socket part 5 of the artificial tooth part 3, respectively. .

Next, as shown in FIG. 2 and FIG.
Then, the artificial tooth part 3 is inserted and implanted into the root socket 5 of the buccal side part 1 and the palate side part 2 through the adhesive 6 and integrated. A prototype body 7 of a maxillary denture base is formed by combining the two parts.

After that, if only a maxillary denture base is to be attached, apply a surfacing agent 9 such as a rebase agent made of polymeric plastic to the back side 8 of the prototype 7 of the appropriate size for the combined denture base, as shown in Figure 4. After adhesion, the prototype body 7 of the denture base with a base is placed in the oral cavity, and the protruding part 9a of the denture base material 9 is removed, and the denture base material 9 is hardened. As a result, the denture base 10 with a base is completed as shown in FIG.

Next, to explain the manufacturing method of the mandibular denture base with reference to Figures 5 to 8, the prototype body of the synthetic resin base denture base, which is standardized and differs in at least the color, size, and shape, is divided into each part. buccal side 11
A large amount of ready-made products of the tongue side part 12 and the artificial tooth part 13 are prepared by injection molding of synthetic resin using a mold. In addition, the buccal side part 11 and the lingual side part 12 have a coupling uneven part 14 and a root socket part 15 of the artificial tooth part 13.
is formed.

Next, as shown in FIG. 5 and FIG.
Then, the artificial teeth 13 are inserted and implanted into the tooth root socket 15 via the adhesive 16, and the artificial teeth 13 are inserted and implanted into the root socket 15 of the model base b via the adhesive 16, and the artificial teeth 13 are integrated and combined to form a lower jaw denture. Floor prototype 17
form. After that, when attaching denture bases for the upper and lower jaws, as shown in Figures 4 and 7, filler materials 9, 19 are placed on the back sides 8, 18 of the prototypes 7, 17 of the denture bases.
After that, the prototypes 7 and 17 of the maxillary denture base and the lower denture base were fitted in the oral cavity while adjusting the occlusion, and the protruding portions 9 of the supplements 9 and 19 were fitted.
a, 19a are removed and cured to complete the denture bases 10, 20 as shown in FIGS. 4 and 7.

Note that the shape and structure of the uneven portions 4 shown in the above-described embodiments may be changed as appropriate, or they may not be formed and may be integrated only by bonding with the adhesive 6 or the like.

In the above-mentioned embodiments, the present invention uses a master model manufactured by adjusting the occlusion of the upper and lower jaws of the denture base as described above, and uses the artificial tooth part, the buccal side part, the palatal side part, or the lingual side part as a master model. A mold is made to fit the divided parts of the denture base into which the above master model is divided so as not to leave any undercut parts, and the divided parts are injection molded using synthetic resin using the mold, and then molded with synthetic resin. A prototype body of a denture base is manufactured by integrating the divided artificial tooth part and the buccal side part, palatal side part, or lingual side part by adhesion, etc., and the base material is attached to the prototype body, and It can be placed in the oral cavity and tried on directly or on a model with jaw movements reproduced on a functional articulator, and then the protruding part of the material is removed, so the impression and plaster mold can be removed. It solves the problem of intermediate processing such as manufacturing, and it can be trial-fitted directly or indirectly in the oral cavity, making it possible to manufacture denture bases with excellent clinical suitability using off-the-shelf mass-produced products. Become. In other words, it is possible to mass-produce the floor part using ready-made artificial teeth manufactured by injection molding with excellent precision, and the artificial tooth part can be integrated with the ready-made artificial floor part and directly supplemented. Because of this, it is possible to obtain a mechanically superior denture base relatively inexpensively and efficiently.

[Brief explanation of drawings]

Figures 1 to 4 show the maxillary denture base, Figure 1 is a perspective view of the divided ready-made product, Figure 2 is a perspective view of the bonded state, and Figure 3 is the prototype of the combined denture base. FIG. 4 is a cross-sectional view of the product after supplementation, FIGS. 5 to 8 are for the lower jaw, FIG. 5 is a perspective view of the divided ready-made product, and FIG. 6 is a perspective view showing the bonded state. FIG. 7 is a plan view of the prototype body, and FIG. 8 is a sectional view of the product. 1... Buccal side part, 2... Palatal side part, 3... Artificial tooth part, 6... Adhesive, 7... Prototype of denture base,
10... Product of maxillary denture base, 11... Buccal side part, 12... Lingual side part, 13... Artificial tooth part, 17...
... Prototype, 20 ... Mandibular denture base product.

Claims (1)

[Claims] 1 The master model was prepared by preparing the occlusion of the upper and lower jaws of the denture base, and the above master model was created so as not to leave any undercuts on the artificial teeth, buccal side, palate side, or lingual side. A mold is made to match the divided parts of the denture base,
The split body is injection molded from synthetic resin using the mold, and then the artificial tooth portion, which is the synthetic resin split body, and the buccal side, palate side, or lingual side are integrated by adhesive etc. A method of manufacturing a denture base with a base.