JP2007289679A - Method of manufacturing denture and passage sealing material for use in it - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method of easily and inexpensively manufacturing a favorable denture having excellent compatibility without displacement of an artificial tooth and defect. <P>SOLUTION: A bed cavity is filled with slurry-like or paste-like ordinary temperature polymerization type bed resin through a forming mold 1 resin injection passage having a resin injection passage 2 and a vent passage 5 communicating with the bed cavity 4 where the base part of the artificial tooth is exposed, and filled up to a predetermined position in each passage. An easily deformable passage sealing material is filled in each passage, and brought into close contact with the end face of the bed resin in each passage, and each passage is sealed. After that, the bed resin filled in the bed cavity is polymerized prior to polymerization of the bed resin in each passage, and the passage sealing material is brought into close contact with the end face of the bed resin in each passage and moved in each passage while sealing each passage as the bed resin in each passage is moved toward the bed resin in the bed cavity by polymerization shrinkage caused by polymerization of the bed resin in the bed cavity. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a method for manufacturing a denture and a passage seal material used therefor. More specifically, the present invention provides compatibility compensation by performing polymerization shrinkage compensation of the floor resin when a denture is manufactured by filling the mold with a room temperature polymerization floor resin through the resin injection passage. The present invention relates to a method for producing a good denture and a passage seal material used therefor.

  When a denture is made by filling a mold with a polymerizable floor resin containing polymer fine particles in a monomer and polymerizing the floor resin, the denture is generally reduced due to polymerization shrinkage of the floor resin, Therefore, compatibility between the denture and the mucosal surface of the patient cannot be obtained, or the artificial tooth is pulled to the floor resin side in the mold and moved from the proper position (displacement of the artificial tooth), or partially on the denture base Or other defects (for example, shrinkage nests, bubbles) may occur.

In Patent Document 1, as a method for producing a compatible denture, a filling resin is stored in a cylinder provided with a piston, and the cylinder is cooled by a cooling device, thereby delaying the polymerization of the filling resin and filling. It is described that a resin for pressurization is pressed into a mold through a sprue while being pressurized with a piston to compensate for the polymerization shrinkage that occurs during the polymerization of the floor resin.
JP-A-6-30955

The manufacture of the denture described in Patent Document 1 requires an automatic filling device for a filling resin equipped with a cooling device, a pressurizing device, etc., which has a large and complicated structure and is expensive. In addition, a large installation space is required, the operability is inferior, and only one denture can be manufactured by one unit, and the productivity is low. In the production of dentures, energy costs for cooling are required, and the resin for replenishment remaining in the cylinder after the production of dentures is discarded each time, resulting in waste of raw materials and waste. Processing costs are also high, which ultimately leads to an increase in the cost of producing dentures.
The present invention was devised as a result of intensive research in view of the above-described circumstances, and it is possible to easily and inexpensively manufacture a good denture having excellent compatibility and less artificial tooth displacement, loss, etc. The object is to provide a method and useful materials for use therein.

  In order to solve the above-mentioned problems, the method for producing a denture according to the present invention is as follows. Fill the floor cavity with a paste-like room temperature polymerization type floor resin and fill the passage with a predetermined position, and fill the passage with an easily deformable passage seal material for the floor in the passage. After sealing the end face of the resin and sealing the passage, the floor resin filled in the floor cavity is polymerized prior to polymerization of the floor resin in the passage, and the floor resin in the floor cavity is obtained. The floor seal in the passage follows the movement of the floor resin in the passage toward the floor resin in the floor cavity due to polymerization shrinkage accompanying polymerization of Close the end face and seal the passage. Characterized by being adapted to move.

  (2) Slurry or paste room-temperature polymerization type floor resin is transferred to the floor cavity through the resin injection passage of the molding die in which the vent passage communicates with the floor cavity where the base of the artificial tooth is exposed. Each of the passages is filled up to a predetermined position, and an easily deformable passage seal material is filled in each of the passages so as to be in close contact with the end surface of the floor resin in each of the passages. After sealing, the floor resin filled in the floor cavity is polymerized prior to polymerization of the floor resin in each passage, and the polymerization shrinkage accompanying the polymerization of the floor resin in the floor cavity causes the above-described polymerization shrinkage. Following the movement of the floor resin in each passage through the passage toward the floor resin in the floor cavity, the passage sealing material is in close contact with the end surface of the floor resin in each passage. Each passage with each passage sealed The may be characterized in that so as to move respectively.

  (3) It is preferable that the passage sealing material does not polymerize under the polymerization conditions of the slurry for a floor or the paste in the form of a paste.

  And in the above (3), (4) the floor resin contains a (meth) acrylate, a (meth) acrylic acid polymer, and a room temperature polymerization initiator, and is a slurry-like or paste-like composition, The passage sealing material preferably contains a (meth) acrylate, a (meth) acrylic acid polymer, and a polymerization inhibitor, and is a slurry-like or paste-like composition.

  (5) It is preferable that the molding die is formed of a gypsum investment material, and a slurry-like or paste-like room temperature polymerization type floor resin is filled by pouring through the resin injection passage.

  (6) The molding die has a thickness from the floor cavity surface to the outer surface of the molding die, and a portion far from the communication portion between the floor cavity and the passage is thinned. Immersing in hot water supplied in a pressure vessel, pressurizing the pressure vessel, and polymerizing the floor resin filled in the floor cavity prior to polymerization of the floor resin in the passage. preferable.

  The passage sealing material used in the method for producing a denture according to the present invention is characterized in that (7) the material is not polymerized under the polymerization conditions of the slurry resin in the form of a slurry or paste.

  (8) The passage sealing material preferably contains a (meth) acrylate, a (meth) acrylic acid polymer, and a polymerization inhibitor, and is a slurry-like or paste-like composition.

Since the present invention is configured as described above, the following effects can be obtained.
That is,
According to the invention according to (1), a room-temperature polymerization type floor resin in the form of a slurry or a paste is provided via the passage of the molding die in which the resin injection passage communicates with the floor cavity where the base of the artificial tooth is exposed. It is easy to fill the cavity for the floor and to fill the predetermined position of the passage without requiring a special device or technique. In addition, it is easy to fill the passage with an easily deformable passage seal material so as to be in close contact with the end surface of the floor resin in the passage and to seal the passage without requiring any special device or technique. And, by simply polymerizing the floor resin filled in the floor cavity prior to polymerization of the floor resin in the passage, polymerization shrinkage accompanying polymerization occurs in the floor resin in the floor cavity, The floor resin in the passage is pulled by the floor resin filled in the floor cavity, and the passage is moved toward the floor resin in the floor cavity to compensate for the polymerization shrinkage. At that time, the easily deformable passage seal material follows the polymerization shrinkage compensation, and moves while keeping the passage in close contact with the end surface of the floor resin in the passage. Good dentures with little displacement, loss, etc. of artificial teeth can be obtained.

According to the invention according to (1), there is no clear basis for obtaining a good denture having excellent compatibility and less artificial tooth displacement, loss, etc., but the floor resin filled in the floor cavity is As described above, the polymerization shrinkage compensation accompanying the polymerization is performed only by polymerizing the floor resin in the passage in advance, but at that time, the floor resin in the passage is isolated from the outside by an easily deformable passage seal material. It is understood that the main factors are that it is responsible for the polymerization shrinkage compensation in the wet state and that the easily deformable passage seal material moves in close contact with the end face of the floor resin and keeps the passage sealed following the polymerization shrinkage compensation. The
Therefore, according to the invention according to (1), there is no need for an apparatus having a large, complicated structure, an expensive cooling device, a pressurizing device, etc. as in the invention described in Patent Document 1, Easily deformable passage seals that do not require a large space, have good operability, high productivity, do not require energy costs for cooling, and have almost no floor resin to be discarded after denture production Even if the material is discarded, it is possible to reduce the waste of the raw material, the waste processing cost is low, and eventually, a good denture with excellent compatibility and few defects is easily and inexpensively manufactured. can do.

  According to the invention which concerns on (2), it is for slurry-like or paste-like room temperature polymerization type floors through the resin injection passage of the molding die in which the vent passage is further communicated with the floor cavity where the base of the artificial tooth is exposed. It is easy to fill the resin into the floor cavity and fill the resin injection passage and the vent passage to predetermined positions without requiring any special device or technique, and an easily deformable passage seal. It is easy to fill the respective passages with each other so as to be in close contact with the end surface of the floor resin in each of the passages, and to seal each of the passages without requiring a special device or technique. And, by simply polymerizing the floor resin filled in the floor cavity prior to polymerization of the floor resin in each passage, polymerization shrinkage accompanying polymerization occurs in the floor resin in the floor cavity, The floor resin in each passage is pulled by the floor resin filled in the floor cavity, and each passage is moved toward the floor resin in the floor cavity to compensate for polymerization shrinkage. At that time, the easily deformable passage sealing material follows the polymerization shrinkage compensation, and moves in close contact with the end face of the floor resin in each passage while keeping each passage sealed. Excellent dentures with excellent artificial tooth displacement and loss are obtained.

  According to the invention according to (3), since the passage sealing material is not polymerized under the polymerization conditions of the slurry or paste in the form of the floor resin, even if the floor resin is polymerized, the passage sealing material is used. Thus, it is possible to obtain a good denture having excellent adaptability and little displacement or loss of artificial teeth.

  According to the invention according to (4), since the floor resin before polymerization and the passage sealing material have similar compositions, the close contact with the end surface of the floor resin in the passage and the sealing performance of the passage It is good and does not polymerize unlike the floor resin, so that the polymerization of the polymerization caused by the polymerization can be achieved simply by polymerizing the floor resin filled in the floor cavity prior to the polymerization of the floor resin in the passage. Occurs in the floor resin in the floor cavity, and the floor resin in the passage is pulled by the floor resin filled in the floor cavity to move the passage toward the floor resin in the floor cavity. When the polymerization shrinkage compensation is performed, the passage sealing material follows the polymerization shrinkage compensation, and is surely moved with the passage sealed while being in close contact with the end surface of the floor resin in the passage. Good definition with excellent performance and minimal displacement and loss of artificial teeth It will be obtained. The floor resin and the material constituting the passage seal material used here are usually provided in dental clinics and dental laboratories, and need not be newly introduced.

  According to the invention according to (5), the mold is inexpensive, and filling of the mold with a slurry-like or paste-like room temperature polymerization type floor resin can be easily performed by a pouring operation and has excellent compatibility. Therefore, it is possible to manufacture a good denture with few displacements and defects of the artificial tooth at a low cost.

  According to the invention according to (6), it is easy to polymerize the floor resin filled in the floor cavity prior to polymerization of the floor resin in the passage, and the polymerization time can be shortened. In addition, generation of bubbles during polymerization of the floor resin can be reliably suppressed by pressurization in the pressure vessel.

The best mode for carrying out the invention will be described below, and the present invention will be described in more detail. Of course, the present invention is not limited to the following embodiments.
First, as a slurry or paste-like room temperature polymerization type flooring resin that can be used in the present invention, a composition containing (meth) acrylate, (meth) acrylic acid polymer, and room temperature polymerization initiator, for example, methyl The main component is a liquid monomer such as methacrylate (MMA) and a powdered polymer such as polymethyl methacrylate (PMMA), and includes a room temperature polymerization initiator. Further, if necessary, an oxidation stabilizer, an ultraviolet absorber, Examples thereof include pigments, dyes, pseudovascular fibers and the like, but are not particularly limited as long as they contain a room temperature polymerization initiator and are usually used as a flooring resin.

  The passage sealing material used in the present invention is easily deformable, that is, the floor resin filled in the floor cavity is polymerized prior to polymerization of the floor resin in the passage, and the floor inside the floor cavity is The floor resin in the passage follows the movement of the floor resin in the passage toward the floor resin in the floor cavity due to polymerization shrinkage accompanying the polymerization of the resin for the floor, and is in close contact with the end surface of the floor resin in the passage. However, it is preferable that the resin does not polymerize under the polymerization conditions of the floor resin, and is similar to the composition of the floor resin filled in the mold. It is preferable that the viscosity can be approximated, it has heat insulation properties, and does not dissolve in hot water as described later, but is not limited thereto.

In order to satisfy such conditions, (meth) acrylate, (meth) acrylic acid polymer, and a polymerization inhibitor are contained, and a slurry or paste-like composition, for example, a liquid such as methyl methacrylate (MMA) A slurry-like or paste-like composition containing a monomer in the form of a polymer and a powdery polymer such as polymethyl methacrylate (PMMA) as a main component and containing a polymerization inhibitor can be mentioned.
Examples other than those described above include slurry-like or paste-like compositions in which the liquid monomer is ethylene glycol dimethacrylate, the powdery polymer is polyethyl methacrylate (PEMA) as a main component, and the polymerization inhibitor is included. be able to.

  Examples of the polymerization inhibitor that can be used here include 6-tert-2,4-xylenol, 2,6-di-tert-butyl-p-cresol, hydroquinone, p-methoxyphenol, and the like. These polymerization inhibitors may be used alone or in combination.

The polymerization inhibitor and the main component in the slurry-like or paste-like composition containing the liquid monomer and the powdery polymer as the main components and containing the polymerization inhibitor, the polymerization inhibitor is 0.1 to 10% by weight. The main component is preferably 90 to 99.9% by weight. If the polymerization inhibitor is less than 0.1% by weight, it is not preferable because the influence of the polymerization initiator in the floor resin starts to occur in the portion that comes into contact with the room temperature polymerization type floor resin. However, it is not preferable because the inability to polymerize does not improve any more.
The passage sealing material is not limited to those described above, and examples thereof include agar, gelatin, pectin, wax, silicon rubber, and latex.

Hereinafter, the best mode of the present invention will be described in more detail with reference to the drawings. Of course, the present invention is not limited to the following embodiments.
FIG. 1 is an explanatory view showing an embodiment of a mold used for manufacturing a denture according to the present invention, and FIG. 2 is a perspective view of the mold shown in FIG.
This molding die 1 is an action for making a full denture of the upper jaw with a plaster as an investment material, and a slurry-like or paste-like room temperature polymerization type floor resin adjusted for pouring is passed through a resin injection passage 2. Then, it is poured into the mold 1 and used for polymerization. In the mold 1, the crown portion of the artificial tooth 3 is buried in the plaster, while the base portion is exposed in the floor cavity 4, and the resin injection passage 2 and the vent passage 5 communicate with the floor cavity 4. is doing. More specifically, the resin injection passage 2 communicates with the floor cavity 4 at a position distal to the right last molar to form a communication portion 4a, and the vent passage 5 is centrifugally separated from the floor cavity 4 and the left last molar. The communication portion 4b is formed by communicating at the side position. The resin injection passage 2 and the vent passage 5 are both open at the top surface of the mold 1.

A crown portion of the artificial tooth 3 of the front tooth portion is buried on the bottom surface side of the mold 1. The mold 1 can be placed vertically on the bottom surface. The resin injection passage 2 and the vent passage 5 are substantially equidistant from the front surface of the mold 1 and are also substantially equidistant from the back surface, and the resin injection passage 2 and the right side surface, and the vent passage 5 and the left side surface are also substantially equidistant. Is provided.
The molding die 1 can be divided into an upper die 1a and a lower die 1b by a dividing surface. The concave portion of the upper mold 1a has a shape corresponding to the oral cavity side of the denture base, and the base portion of the artificial tooth 3 is exposed in the concave portion. The recess of the lower mold 1b has a shape corresponding to the mucosal surface. The floor cavity 4 is formed by combining the upper mold 1a and the lower mold 1b. The resin injection passage 2 and the vent passage 5 are formed by a pair of opposed concave grooves provided on the dividing surfaces of the upper mold 1a and the lower mold 1b.

  The thickness of the floor cavity 4 and the outer surface of the molding die 1 is thin at a portion far from the communication portions 4a and 4b of the floor cavity 4, the resin injection passage 2 and the vent passage 5, that is, the front tooth portion of the floor cavity 4 And the bottom of the mold are the thinnest. By providing the thin portion described above, the molding die 1 having this structure can polymerize the floor resin filled in the floor cavity prior to polymerization of the floor resin in each passage, as will be described later. The floor resin in each passage follows the movement of each passage toward the floor resin in the floor cavity due to polymerization shrinkage accompanying polymerization of the floor resin in the floor cavity. The sealing material is in close contact with the end surface of the floor resin in each passage, and each passage is moved while the passage is sealed.

What is necessary is just to manufacture such a shaping | molding die 1 as follows.
The wax denture 9 in which the artificial teeth 3 are arranged on the work model 8 in accordance with a common method is installed in a rubber flask lower portion 10a as shown in FIG. 3, and is primarily buried with gypsum. Here, the wax denture 9 is installed so that the space | interval t of the front tooth part and the inner surface of the flask lower part 10a may become the shortest. And after apply | coating a separating agent to the gypsum surface, the sprue 11a, 11b made from wax is attached (refer FIG. 4). The sprue 11 a is for forming the resin injection passage 2, and the sprue 11 b is for forming the vent passage 5. The diameter and length of the sprue may be appropriately determined based on the polymerization shrinkage of the floor resin, the filling amount necessary for the passage seal material, and the like.

Next, plaster is placed using a brush, a spatula or the like so that the artificial teeth 3 and sprues 11a and 11b arranged in the wax denture 9 are hidden, and then secondary embedded.
Then, as shown in FIG. 5, a rubber flask upper portion 10b is fitted to the flask lower portion 10a, and the inside of the flask is tertiary buried with gypsum. If necessary, the mold may be scraped later so that the front tooth portion of the wax denture 9 and the bottom surface of the mold 1 become the thinnest after the third burying.
After the gypsum has hardened, the mold 10 shown in FIG. 1 is obtained by removing the flask upper part 10b and the flask lower part 10a and flowing the wax.

Next, a specific method for manufacturing an upper complete denture using the mold 1 shown in FIG. 1 will be described.
The upper mold 1a is formed by applying a separating agent to the concave portion and the concave groove except for the base portion of the artificial tooth, and the lower mold 1b is formed by combining the upper mold 1a and the lower mold 1b and fixed by the rubber band 13.

A room-temperature polymerization type floor resin 14 in the form of a slurry or paste is poured into the molding die 1 through the resin injection passage 2 to fill the floor cavity 4 of the molding die 1, and the resin injection passage 2 and the vent passage. 5 is filled to a predetermined position. The pouring of the floor resin 14 into the mold 1 may be performed using a beaker or the like, but may be performed using a syringe. The filling position of the resin injection passage 2 and the vent passage 5 is a safe position in anticipation of the polymerization shrinkage rate of the floor resin 14 filled in the mold 1 and the floor resin filled in each passage. It is sufficient that the passage sealing material that is in close contact with the end face of 14 and seals the passage should be at a position where it can be filled with an amount capable of performing its function as described above.
For example, in a slurry room-temperature polymerization type floor resin mainly composed of MMA as a monomer liquid component and PMMA as a polymer powder component, the polymerization shrinkage is a volume shrinkage of 8 to 9%.

In the remaining space of the resin injection passage 2 and the vent passage 5 filled with the resin for flooring, a volume sufficient to fill the filling amount capable of performing the function of the passage sealing material is secured. The passage is filled with a slurry-like passage sealing material so as to be in close contact with the end surface of the floor resin in the passage and the passage is sealed.
Filling the resin injection passage 2 and the vent passage 5 with the passage sealing material may be performed by a beaker or a syringe. However, even if the resin injection passage 2 and the vent passage 5 are filled, the amount is not large.

As the passage sealing material, the above-mentioned slurry or paste is similar to the composition of the floor resin filled in the mold 1, can approximate viscosity and the like, has heat insulation properties, and does not dissolve in hot water. However, the present invention is not limited to this.
In FIG. 6, the floor resin 14 is filled in the floor cavity 4 of the mold 1 and is filled to a predetermined position of the resin injection passage 2 and the vent passage 5, and then the resin injection passage by the passage seal material 15. 2 and the vent passage 5 are sealed.

  In the state shown in FIG. 6, the polymerization of the floor resin proceeds at room temperature, but the polymerization is performed by immersing the mold 1 in the hot water in the polymerization pressure vessel to shorten the production time of the denture. Or generation of bubbles in the resin for flooring accompanying polymerization can be suppressed.

FIG. 7 shows a state in which the mold 1 shown in FIG. 6 is immersed in hot water in the pressure vessel 20.
The pressure vessel 20 for polymerization can be a ready-made one, and has a vessel body 21 and a lid 22, and the lid 22 is provided with a pressurized air introduction pipe 23, a pressure gauge 24, and a safety valve 25.

  The water surface position of the hot water in the pressure vessel is determined by polymerizing the floor resin filled in the floor cavity prior to the polymerization of the floor resin in each passage, and the polymerization accompanying the polymerization of the floor resin in the floor cavity. Following the movement of the floor resin in each passage toward the floor resin in the floor cavity due to the shrinkage, the respective passages are sealed in close contact with the end surface of the floor resin in each passage. It may be set so that each passage can be moved as it is. However, due to the structure of the molding die described above, even if the molding die is completely immersed in hot water (see the water surface position indicated by the two-dot chain line), Before the polymerization of the floor resin in each passage, the floor resin filled in is polymerized by the polymerization shrinkage accompanying the polymerization of the floor resin in the floor cavity. Follow each moving towards the floor resin in the cavity, While sealed closely the passage and an end face of the denture base resin in the road each passage can be moved, respectively.

  Of course, even if the mold is soaked to the extent that the vicinity of the front teeth in the mold is soaked in hot water (see the water surface position indicated by the solid line), the floor resin filled in the floor cavity is filled in each passage. Before the polymerization of the floor resin, the floor resin in each passage passes through each passage toward the floor resin in the floor cavity due to polymerization shrinkage accompanying the polymerization of the floor resin in the floor cavity. Following the movement, each passage can be moved while being in close contact with the end surface of the floor resin in each passage and sealing each passage.

The water temperature of the hot water is preferably 40 to 55 ° C. in the above-described resin for floors. If it is less than 40 degreeC, a residual monomer will increase and it is unpreferable. When it exceeds 55 ° C., the polymerization proceeds rapidly, and internal distortion and bubbles are likely to occur.
The pressurization into the container is preferably 0.1 to 0.3 MPa. When the pressure is less than 0.1 MPa, bubbles are likely to be generated at the time of polymerization at the above water temperature.
The polymerization time varies depending on the number of molds accommodated in the container, the volume of the floor resin filled in the mold, the polymerization initiator, and the like, but is usually about 20 to 40 minutes.

Simply polymerize the floor resin filled in the floor cavity of the mold in the pressure vessel prior to the polymerization of the resin for the floor in the resin injection passage and vent passage. The polymerization shrinkage accompanying polymerization occurs in the floor resin in the floor cavity, and the floor resin in each passage enters the floor cavity. Pulled by the filled floor resin, each passage is moved toward the floor resin in the floor cavity to compensate for the polymerization shrinkage. At that time, the passage sealing material is easily deformable, and follows the polymerization shrinkage compensation, and moves in close contact with the end surface of the floor resin in each passage while sealing each passage. As a result, a good denture having excellent compatibility and less displacement or loss of artificial teeth can be obtained. There may be a single mold that is stored in the pressure vessel, but it is possible to store a plurality of molds and polymerize them at the same time. However, even in such a case, since a good denture is manufactured as described above, the adjustment of the water surface position and the like may be rough and easy without requiring skill.
If a plurality of molds are housed in the pressure vessel and the floor resin is polymerized, the production efficiency of the denture can be improved.

In addition, in order to polymerize the floor resin filled in the floor cavity prior to polymerization of the floor resin in the resin injection passage and the vent passage, the thickness of the floor cavity and the outer surface of the mold is adjusted. In addition, the heat insulating material may be disposed on the outer surface of the mold without adjusting the thickness.
The method of polymerizing the floor resin filled in the floor cavity prior to the polymerization of the floor resin in the passage is not limited to a method in which the mold is immersed in hot water. It may be carried out by placing on a board, or hot air may be blown on the front teeth of the mold, or infrared rays may be irradiated.

  After the polymerization is completed, the mold 1 is taken out from the pressure vessel 20, and the mold 1 is gradually cooled according to a conventional method. Next, after removing the rubber band 13 and taking out the denture from the mold 1 using a tool such as plaster forceps, the cured product of the floor resin remaining in the resin injection passage 2 and the vent passage 5 is removed and finish-polished. The passage sealing material 15 may be removed and discarded when taking out the denture from the mold 1 using a tool such as gypsum forceps. FIG. 8 is a perspective view of the finish-polished denture 26. FIG. In FIG. 8, for reference, the cured product remaining in the resin injection passage and the vent passage even after compensation for polymerization shrinkage is indicated by a two-dot chain line.

  In the above, since a rubber-made flask was used, a mold from which the flask was removed was used, but the present invention is not limited to this. For example, a metal flask has good thermal conductivity. You may use it without removing it.

  In the above description, the gypsum investment material is used as the mold, but the present invention is not limited to this, and an investment material such as agar, silicon rubber, or alginate may be used as the mold. When agar, silicon rubber, or the like is used for the mold, the mold is polymerized in a commonly used metal flask. The production of dentures using an investment material such as agar or silicon rubber may be performed in accordance with the production of dentures using a gypsum investment material as described above, and detailed description thereof is omitted.

Further, for example, in the case of a left lower jaw partial denture, a denture can be manufactured using a molding die having only a resin injection passage without requiring a vent passage. This is, for example, a mold 31 shown in FIG. In this mold 31, even if a vent passage is not formed, the floor resin is slowly injected through the resin injection passage 32, so that the floor resin can be obtained without causing an air pocket or the like in the floor cavity 33. Since the floor cavity 33 can be filled or the like, the vent passage like the molding die 1 having a full denture function shown in FIG. 1 can be omitted. It is preferable to make the diameter of the resin injection passage 32 thicker than that of FIG. 1 so that no air pockets or the like are generated when the floor resin is injected.
The rest of the configuration is the same as that of the mold 1 shown in FIG. 1, and therefore, detailed description of the structure of the mold 31 and detailed description of a method for manufacturing a denture using the mold 31 are omitted.

  In the case of partial dentures, only the parts necessary for partial dentures are cut out from wax dentures, a molding die with a resin injection passage communicating with the floor cavity is manufactured, and dentures are manufactured using the molding die. You may make it do. In such a case, the mold for the partial denture is polymerized in a state of being completely immersed in warm water.

Next, an example is shown with a comparative example, and it explains in more detail.
Example 1
A complete denture was manufactured according to the above-described manufacturing method using a mold (see FIG. 1) for the operation of an upper complete denture using a plaster investment material.
An outline is shown below.
A mold was prepared by embedding a wax denture for a full denture of the upper jaw manufactured in accordance with a common method in a rubber flask with a gypsum investment material. For the gypsum embedding, after the primary embedding, a separating agent was applied to the surface of the gypsum, and the resin sprue for resin injection passage and the sprue for vent passage were connected to the wax denture, and the secondary embedding and the third embedding were performed. The resin injection passage sprue and the vent passage sprue have a diameter of about 7 mm and a length of about 20 mm.

  After the gypsum was cured, the mold was removed from the rubber flask. The wax of the obtained mold was cast and separated into an upper mold and a lower mold on the dividing surface. The thickness of the front tooth portion and the bottom surface of the floor cavity is about 0.5 cm. The thickness from the division surface to the front surface of the front tooth portion of the upper mold is about 2 cm, and the thickness from the division surface to the front surface at the portion corresponding to the communication portion between the resin injection passage and the floor cavity is about 1.65 cm. Moreover, the thickness from the division surface of the location corresponding to the communicating part of a vent channel | path and a floor cavity to a front surface is about 1.65 cm. The thickness from the split surface to the back surface of the lower front tooth portion is about 1 cm, and the thickness from the split surface to the back surface of the portion corresponding to the communication portion between the resin injection passage and the floor cavity is about 0.65 cm. Moreover, the thickness from the division surface of the location corresponding to the communicating part of a vent channel | path and a floor cavity from a back surface is about 0.65 cm.

The upper mold was formed by applying a separating agent to the recesses and grooves, except for the base of the artificial teeth, and the lower mold was combined with the upper mold and the lower mold, and fixed with a rubber band.
A room-temperature polymerization type floor resin in the form of a slurry or paste is poured into the mold through the resin injection passage and filled into the mold cavity, and the resin is used in anticipation of the polymerization shrinkage of the floor resin. It filled to the predetermined position (The state which left the depth of about 0.7 cm from the top surface) of the injection channel and the vent channel.

  The floor resin used is a slurry made by mixing 40 parts by weight of MMA containing 0.4% by weight of dimethylparatoluidine and 60 parts by weight of PMMA containing 0.5 parts by weight of benzoyl peroxide (BPO). did. The room temperature polymerization initiator in this floor resin is composed of a combination of dimethylparatoluidine and BPO.

Subsequently, a separately prepared passage sealing material was injected and filled into the remaining spaces of the resin injection passage and the vent passage. The filling amount of the passage sealing material into the resin injection passage is about 0.27 cm ³ , and the filling amount into the vent passage is also about 0.27 cm ³ .
As the passage sealing material, a slurry-like material comprising 75 parts by weight of ethylene glycol dimethacrylate, 25 parts by weight of PEMA and 1 part by weight of 6-tert-2,4-xylenol which is a polymerization inhibitor was used. Injection of the passage sealing material into the resin injection passage and the vent passage was performed until the previously filled slurry-like floor resin changed into a soot paste or the like. To check whether the floor resin has changed to a cocoon paste, etc., the mold was tilted to check the state of the floor resin in the passage. Separately, a small amount of the floor resin was placed on a glass plate, etc. You may check for changes.

Then, the mold was completely immersed in hot water (55 ° C.) in the pressure vessel, and the resin for bed was polymerized for 30 minutes under a pressure of 0.2 MPa (see FIG. 7). The water temperature after 30 minutes was 50 ° C.
The time from the start of mixing the floor resin to filling the mold and the storage of the floor resin in the pressure vessel was set to 5 minutes.
After completion of the polymerization, the mixture was allowed to cool for 30 minutes in a thermostat at 23 ° C. and 50% humidity, and then cooled in water at 20 ° C. for 30 minutes.

  After cooling, the mold taken out from the water was cut in the transverse direction, and the compatibility of the denture was evaluated by the following test method.

<Compatibility test method>
When the upper and lower mold plaster investment materials are removed, the denture is placed on the work model, the denture is separated from the work model, the denture is deburred, and then the denture is returned to the work model. The five gaps a to e generated between the working model and the denture base, that is, the lifting amount (see FIG. 10) are measured with a digital microscope.
The test results are as shown in FIG. 11, and the compatibility is good.
In addition, there was no generation of bubbles or the like in the denture base, and displacement of the artificial teeth was not confirmed.

(Comparative Example 1)
In Comparative Example 1, a denture was manufactured without using a passage sealing material.
Specifically, a mold produced in the same manner as in Example 1 was used.
That is, the diameter of the wax resin injection passage sprue and the vent passage sprue is about 7 mm and the length is about 20 mm.
After the gypsum was cured, the mold was removed from the rubber flask. The wax of the obtained mold was cast and separated into an upper mold and a lower mold on the dividing surface. The thickness of the front tooth portion and the bottom surface of the floor cavity is about 0.5 cm. The thickness from the division surface to the front surface of the front tooth portion of the upper mold is about 2 cm, and the thickness from the division surface to the front surface at the portion corresponding to the communication portion between the resin injection passage and the floor cavity is about 1.65 cm. Moreover, the thickness from the division surface of the location corresponding to the communicating part of a vent channel | path and a floor cavity to a front surface is about 1.65 cm. The thickness from the split surface to the back surface of the lower front tooth portion is about 1 cm, and the thickness from the split surface to the back surface of the portion corresponding to the communication portion between the resin injection passage and the floor cavity is about 0.65 cm. Moreover, the thickness from the division surface of the location corresponding to the communicating part of a vent channel | path and a floor cavity from a back surface is about 0.65 cm.
The floor resin of the same type as in Example 1 was poured into the mold through the resin injection passage to fill the floor cavity of the mold, and filled up to the openings of the resin injection passage and the vent passage.

The molding die was completely immersed in hot water (55 ° C.) in a pressure vessel shown in FIG. 7, and the resin for a bed was polymerized for 30 minutes under a pressure of 0.2 MPa. The water temperature after 30 minutes was 50 ° C.
The time from the start of mixing the floor resin to filling the mold and the storage of the floor resin in the pressure vessel was set to 5 minutes.
After completion of the polymerization, the mixture was allowed to cool for 30 minutes in a thermostat at 23 ° C. and 50% humidity, and then cooled in water at 20 ° C. for 30 minutes.

The compatibility test of the obtained denture was performed according to the test method described in Example 1.
The test results are as shown in FIG. 11, and the compatibility was difficult. In particular, the compatibility was poor in the vicinity of the vent passage (see the gap d in FIG. 11).
In addition, wrinkles were generated in the denture base, and displacement of the artificial teeth was also observed.

It is explanatory drawing which shows one Embodiment of the shaping | molding die used by this invention, Comprising: (a) is a front view, (b) is a right view, (c) is a top view, (d) is an AA line. It is sectional drawing. It is a perspective view of the shaping | molding die shown in FIG. It is explanatory drawing which shows one process in manufacture of the shaping | molding die shown in FIG. 1, Comprising: (a) is a front view, (b) is a BB sectional drawing. It is explanatory drawing which shows the other process in manufacture of the shaping | molding die shown in FIG. It is explanatory drawing which shows the other process in manufacture of the shaping | molding die shown in FIG. 1, Comprising: (a) is a front view, (b) is CC sectional view taken on the line. It is a partially broken front view for description which shows one process of manufacturing a denture using the shaping | molding die shown in FIG. It is a fragmentary sectional explanatory view which shows the other process which manufactures a denture using the shaping | molding die shown in FIG. It is a perspective view of the denture manufactured using the shaping | molding die shown in FIG. It is a front view which shows other embodiment of the shaping | molding die used by this invention. It is explanatory drawing of the compatibility test method of the denture manufactured using the shaping | molding die of this invention. It is a figure which shows the result of the compatibility test of the denture manufactured using the shaping | molding die of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Mold 2 Resin injection passage 3 Artificial tooth 4 Cavity for floor 5 Vent passage 8 Work model 9 Wax denture 10a Lower flask 10b Upper flask

Claims (8)

The floor cavity is filled with a slurry or paste room temperature polymerization type floor resin through the passage of the molding die in which the resin injection passage communicates with the floor cavity where the base portion of the artificial tooth is exposed. Filling a predetermined position of the passage,
After filling the passage with an easily deformable passage seal material and bringing it into close contact with the end surface of the floor resin in the passage, the passage is sealed,
The floor resin filled in the floor cavity is polymerized prior to polymerization of the floor resin in the passage, and the floor resin in the passage is caused by polymerization shrinkage accompanying polymerization of the floor resin in the floor cavity. Follows the movement of the passage toward the floor resin in the floor cavity so that the passage seal material moves in the passage while keeping the passage in close contact with the end surface of the floor resin in the passage. A method for producing a denture characterized by the above. Filling the floor cavity with a room temperature polymerization type floor resin in the form of a slurry or paste through the resin injection path of the molding die in which the vent path communicates with the floor cavity with the base of the artificial tooth exposed. And filling each passage to a predetermined position,
After filling each of the passages with easily deformable passage seal materials and bringing them into close contact with the end surface of the floor resin in each passage, and sealing each passage,
The floor resin filled in the floor cavity is polymerized prior to polymerization of the floor resin in each passage, and the floor in each passage is subjected to polymerization shrinkage accompanying polymerization of the floor resin in the floor cavity. Following the movement of the resin in each passage toward the floor resin in the floor cavity, the passage sealing material is in close contact with the end surface of the floor resin in each passage to seal each passage. 2. The method for producing a denture according to claim 1, wherein each passage is moved as it is.   The method for producing a denture according to claim 1 or 2, wherein the passage sealing material is not polymerized under the polymerization conditions of the slurry in the form of slurry or paste. The floor resin contains a (meth) acrylate, a (meth) acrylic acid polymer, and a room temperature polymerization initiator, and is a slurry-like or paste-like composition,
4. The denture production according to claim 3, wherein the passage sealing material is a slurry-like or paste-like composition containing (meth) acrylate, (meth) acrylic acid polymer, and a polymerization inhibitor. Method.   5. The mold according to claim 1, wherein the molding die is formed of a gypsum investment material, and a slurry-like or paste-like room temperature polymerization type flooring resin is filled by pouring through the resin injection passage. A method for producing a denture according to claim 1. The molding die is such that the thickness from the floor cavity surface to the outer surface of the molding die is such that the portion far from the communication portion between the floor cavity and the passage is thin.
Immerse the mold in hot water supplied in the pressure vessel, pressurize the pressure vessel,
6. The method for producing a denture according to claim 1, wherein the floor resin filled in the floor cavity is polymerized prior to polymerization of the floor resin in the passage.   The passage sealing material used in the method for producing a denture according to any one of claims 1 to 6, wherein the passage sealing material is not polymerized under the polymerization conditions of the slurry resin or paste resin for flooring. Aisle seal material.   8. The passage sealing material according to claim 7, wherein the passage sealing material is a slurry-like or paste-like composition containing (meth) acrylate, (meth) acrylic acid polymer, and a polymerization inhibitor. .

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