JPH02237558A - Denture and preparation thereof - Google Patents

Abstract

PURPOSE:To easily and certainly prepare a denture having good fittability and physical properties within a short time by constituting a foundation base part of a thermoplastic resin while constituting a gum part of a photopolymerizable resin cured polymerizate. CONSTITUTION:The sheet like thermoplastic resin 2 on a gypsum model 1 is molded under heating and pressure to prepare a foundation base part. Artificial teeth 4 are arranged to the upper surface of the obtained foundation base part using a photopolymerizable resin 5 to form a gum. At this time, the photopolymerizable resin is polymerized and cured by the irradiation with light. By this method, the foundation base part is constituted of the thermoplastic resin and the gum part is constituted of the photopolymerizable resin cured polymerizate. By this method, a denture having good fittability and physical properties can be prepared easily and certainly within a short time.

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention relates to a denture and a method for manufacturing the denture, and in particular to a denture that has good compatibility with the alveolar mucosal surface and excellent mechanical strength, and a method for making the denture in a short time. The current question is about how to manufacture it. (Prior Art and Problems to be Solved by the Invention) Conventional dentures are made by making a plaster model from an impression of the oral cavity, then using wax to make a wax denture, which is then covered with plaster or This was done by burying the denture in the impression material, removing the wax, filling it with polymerizable resin under pressure or pouring it, and polymerizing and curing it by heating. This method requires materials and equipment, is extremely time-consuming, and takes a lot of time.Recently, a method of manufacturing dentures using Hikari-FFIH resin has been proposed.Hikari-FFIH resin, Compared to conventionally used chemical-heavy or heat-polymerized resins, it is pre-made into one paste, so there is no need to measure or knead the powder, and it will not harden unless exposed to light.
It has the advantages of excellent operability, such as flexible operation time, and the ability to polymerize in a short time. However, in the conventional fabrication of dentures using photopolymerizable resin, the photopolymerizable resin paste is first pressed onto a plaster model to create a base floor. Therefore, pressure welding must be done with great care so as not to introduce air bubbles into the welded surfaces and to obtain a uniform thickness, which is time-consuming and requires skill, but it is easy to correct. isn't it. In addition, although there are no bubbles visible to the naked eye inside the resin paste, since it is irradiated with light under normal pressure, the resin paste rises from the model surface due to polymerization contraction, and fine bubbles are generated on the pressure contact surface of the resin paste. Sometimes,
Not only did the surface quality of the pressure contact surface of the obtained n-teeth become poor, but the TFLTA durability was also insufficient. Furthermore, depending on the case, there are cases where the entire mucosal surface cannot be heavily cured with a single light irradiation due to the presence of a large undercut. In such cases, methods are used such as changing the way the model is placed and applying light again, or removing the base from the model and applying light again with the mucous membrane side facing up. It is difficult to polymerize and harden the entire denture uniformly in this way. Furthermore, a photopolymerizable resin is built up on the prepared foundation using an instrument or the like to form gingiva, but the photopolymerizable resin is applied through the polymerized layer on the surface of the foundation. Since it is bonded to resin, if that layer becomes contaminated with oil from your hands or fingers during operation, the adhesive strength will drop significantly. Therefore, a special photo-polymerizable adhesive is used, but the cured photopolymerizable resin forms a crosslinkable polymer, which does not adhere easily. The surface of dentures made in this way is rough, so it is necessary to polish the floor surface and the edge of the floor, and this work is a very important part of the denture manufacturing process. This is an important process. However, the shape of dentures is complex, and it takes a great deal of time, effort, and skill to polish all parts of the R tooth until a smooth surface is obtained so as not to damage the shape of the denture base or artificial teeth. It was. Furthermore, when dentures are used for long periods in the oral cavity, they are subject to repeated loads during occlusion. For this reason, dentures made from crosslinkable polymers such as current photopolymerizable resins have a small amount of deflection and cannot be expected to have long-term durability, unlike the conventionally used heated resins. Furthermore, for the same reason, it also has low resistance to counterattacks. As a result, the denture base may break or crack during use in the oral cavity, or the denture base may be inadvertently damaged by the patient, dentist, or dentist.
There was a risk that the tIi would break if dropped.
Additionally, the avi is cleaned daily by the patient;
Toothbrushes and other items are often used in one meter. For this reason, although it is less common with photo-mold resins, in the case of conventional chemical polymerization type or heat polymerization type resins, the gingival part of RtII often wears away and loses its shape. (Means for Solving the Problems) As a result of intensive research to solve the problems of the prior art, the present invention has been made by using a thermoplastic resin as a base material that can be easily pressure-molded into a model by being softened by heating. If the denture is completed by forming the gingival part with a light-duplex resin that is easy to operate for artificial tooth alignment and gingival formation and is less abrasive, it will easily and reliably achieve good 3iI compatibility and physical properties. The present invention was completed by discovering that it is possible to produce rounded teeth in a short period of time. That is, the present invention provides (1) an n tooth characterized in that the base part is made of a thermoplastic resin and the gingival part is made of a photopolymerizable self-cured resin, and (2) a tooth on a model. The first step is to heat and pressure mold a sheet of thermoplastic resin to create a base bed, and the artificial teeth are arranged on the top surface of the base bed obtained in the first step using light heavy h-type resin. Consisting of a second step and a third step of forming one line of meat with Mitsushige H-sei resin.
The method of manufacturing a denture is characterized in that the photopolymerizable resin is hardened by irradiation with light in the third step or in the third and second steps. In the above method, the photopolymerizable resin is irradiated with light at least in the third step, but it can also be irradiated in the second step to improve temporary attachment of the artificial tooth. ．． T-na,
If necessary, it is also possible to irradiate light multiple times intermittently during each process. In the above, polymethyl methacrylate, polycarbonate, boris sulfone, polyether sulfone, etc. can be used as the thermoplastic resin. Methods for heating thermoplastic resin include 4J1 heat rays, infrared rays,
Any method using a heater such as far infrared rays or microwave may be used, but a method that easily and uniformly heats a sheet-shaped thermoplastic resin is particularly preferred. The heated and softened thermoplastic resin is preferably pressed against the model surface using gas pressure such as compressed air, and the pressure used at this time varies depending on the case, but is used in the range of 1 kg/cm2 to 10 kg/cm2. ．． For less than lkg/am2, plaster model l
The effect of pressure welding of ＼ was not sufficiently expressed, and the
Exceeding this is not desirable as there is a risk that the thermoplastic resin will become extremely thin due to pressure. Especially preferably 2k
A pressure range of g/am2 to 7 kg/cIII2 is applicable. Photopolymerizable resin refers to a resin that is polymerized and cured by irradiation with light. (boxyphenyl)globan, di(methacryloxyethyl)trimethylhexamethylene diurethane, 2
, 2-bis(methacryloxyboriethoxyphenyl)propane, etc., quinones such as camphorquinone as a photosensitizer, organic peroxides such as penzoyl peroxide as a heavy initiator, dimethylaminoethyl methacrylate, etc. as a reducing agent. amines, etc., and, if necessary, an organic filler such as polymethyl methallylate,
It may also contain inorganic fillers such as silica and organic R composite fillers. The light source for light irradiation is particularly preferably a visible light emitting lamp, and xenon lamps, halogen lamps, fluorescent lamps, etc. can be used. (Example) The present invention will be explained in more detail with reference to an example. The drawings schematically show the steps of the denture manufacturing method according to the embodiment of the present invention, and FIGS. 1 and 2 show the first step of the present invention, and FIG. 3 shows the second and third steps of the present invention. show. A complete denture was made of filtrate for a patient with an edentulous upper jaw. first,
Using "New Biostar" (pressure molding machine manufactured by Scheu Dental), "BioCrys" was applied to the plaster model 1 of the case.
(Thermoplastic resin sheet manufactured by Scheu Dental) 2 was softened by heating and then pressure molded. (Fig. 1, Fig. 2) Next, take out the entire stone model from "New Biostar" and place "Repdent" (artificial tooth manufactured by Jishi Dental Industry Co., Ltd.) in a predetermined position on the pressure-molded resin plate 3 soil. 4 using Evolex DJ (photopolymerizable resin manufactured by NOF Corporation) 5. Once the position of the artificial tooth alignment has been decided, "α-Light" (
The artificial tooth was fixed on a resin plate by irradiating it with light for 1 minute using a visible light polymerization device manufactured by Morita Tokyo Co., Ltd. fj. After the gingival formation was completed, an air barrier material (oxygen blocker manufactured by NOF Corporation) was applied to the entire surface of the Evolex DJ, and light was irradiated with α-Light for 5 minutes. Polymerization of "Evolex D" has been completed (
Above is Figure 3》 Since only the photopolymerizable resin layer that was later applied was polished, the time required for polishing was very short, about 5 minutes. The resulting denture had excellent compatibility with the adhesive surface of the model, and had a smooth surface with no insufficient pressure on the mucosal surface or any air bubbles. In addition, in the IJII row of artificial teeth in the above embodiment,
It is also preferable to apply a thin layer of adhesive on the surface of the artificial city or resin plate to further improve adhesiveness.

Comparative example: A full maxillary denture for the same case as in the example was fabricated using "Evol Tux D". First, a sheet of ``Evolex D'' was pressed onto the necessary area to match the size of the denture base. Here, it was irradiated with light for 5 minutes using "α-Light" to polymerize and cure. Furthermore, the artificial tooth was arranged at a predetermined position on the resin sheet using Evolex DJ. Once the position was determined, light irradiation was performed for 1 minute using [α-Light J] to fix the artificial tooth. Then, gingival preparation was performed using "Evolex D". After the gingival formation was completed, an air barrier material was applied to the entire surface of the built-up "Evolex D" and irradiated with light for 5 minutes using "α-Lye 1." The R tooth was removed from the model, an air barrier material was applied to the mucosal surface, and light was irradiated with "α-light" for 10 minutes. 113 of the floor edge of the polymerized denture with a carbide bur
After that, the entire floor was sequentially polished with sandpaper, polishing sand, and zinc white, and the denture was completed.

However, compared to the denture obtained in the example, the denture base edge,
Since the oral denture base had to be polished sufficiently smooth, it took about 4 times as much polishing time.

As a result, the suitability of the obtained denture base was inferior to that of the example, and a few air bubbles were observed on the mucosal surface of the model, which were thought to have entered during pressure contact with the air barrier sheet, and the surface of the denture base was also inferior. It was crudely constructed. (Effects of the Invention) As detailed above, according to the method of the present invention, thermoplastic resin is heated and softened, and then pressure molded onto the model surface. When the denture is prepared by forming, a soaked denture with good fit and tI% mechanical strength can be manufactured easily and in a short time. Furthermore, the reproducibility of the model surface of the thermoplastic resin placed on the plaster model and in contact with the surface is smooth and extremely good. Furthermore, by using abrasion-resistant and soakable H-type resin for the gums and a flexible resin for the mucosal surface of the denture base, the denture not only provides a comfortable chewing sensation, but also
It exhibits sufficient performance to withstand long-term use in the oral cavity.

[Brief explanation of drawings]

The drawings schematically show the steps of the method for manufacturing a denture according to an embodiment of the present invention, and FIG. 1 and FIG. 2I2l show the first step of the present invention, and FIG. 3 shows the second and third steps of the present invention. 1. Plaster model, 2. Thermoplastic resin sheets 1, 3, resin plate, 4: Artificial tooth 5: Photopolymerized resin heating Fig. 1 Fig. 2

Claims (3)

[Claims] (1) A denture characterized in that the base part is made of a thermoplastic resin and the gingival part is made of a photopolymerizable cured resin. (2) The first step of heating and press-molding the sheet-shaped thermoplastic resin on the model to create the base floor, and applying photopolymerizable resin to the top surface of the base floor obtained in the first step. The second step is to align the artificial teeth, and the third step is to form the gingiva using photopolymerizable resin.
A method for manufacturing a denture, comprising the steps of: irradiating light to polymerize and harden the photopolymerizable resin in the third step. (3) A first step in which the sheet-shaped thermoplastic resin on the model is heated and pressure-molded to create a base floor, and a photopolymerized resin is applied to the top surface of the base floor obtained in the first step. The second step is to align the artificial teeth, and the third step is to form the gingiva using photopolymerizable resin.
A method for manufacturing a denture, comprising the steps of: irradiating light in the second step and the third step to polymerize and harden the photopolymerizable resin.