Flask fixing device, flask body for manufacturing denture bases, and method for manufacturing denture bases

Abstract

To provide a flask fixing device that can easily secure multiple denture base manufacturing flasks at once, a denture base manufacturing flask, and a denture base manufacturing method. [Solution] The flask fixing device 6 has a base portion 7 on which multiple flasks 1 for manufacturing denture bases, which are roughly rectangular in plan view and consist of a lower flask placed on the lower side and an upper flask placed on top of the lower flask, can be placed side by side, and a cover portion 8 that holds the flasks 1 between itself and the base portion 7, and the cover portion 8 is supported by the base portion 7 and opens and closes so as to be able to open the upper surface of the base portion 7, and a locking portion 9 that fixes the cover portion 8 to the base portion 7.

Description

Technical Field

[0001] The present invention relates to a flask fixture for fixing a flask for manufacturing a denture base, a flask body for manufacturing a denture base, and a method for manufacturing a denture base.

Background Art

[0002] A flask for manufacturing a denture base is used in the manufacture of a resin denture base. For example, Patent Document 1 discloses a dental flask composed of two flask halves. The flask halves are generally mirror-symmetrical to each other, and their flat inner surfaces are brought into contact with each other and fixed to each other by a fixture such as a bolt and a nut passing through the through openings of both. When the two flask halves are joined, a cavity is formed inside the flask.

[0003] When manufacturing a denture base, before the joining, uncured plaster and a provisional denture are placed in a concave portion of one of the flask halves, and then the flask halves are joined to each other with their inner surfaces in contact, and further, pasty plaster is poured so as to surround the provisional denture in the cavity, and the entire plaster is cured. The wax provisional denture is temporarily separated from the flask half, heated and melted, and discharged, and dough-like resin is pressure-injected into the cavity portion or gap formed thereby with a denture base former to mold the denture base.

[0004] Also, for example, Patent Document 2 discloses a flask composed of an upper lid flask including an upper lid, a middle lid, and a frame body formed in a substantially rectangular shape with a metal such as brass, aluminum, or stainless steel, and a lower lid flask including a lower lid and a frame body formed in a substantially rectangular shape with the same metal. Bolts are fitted into substantially U-shaped cutout holes provided at the four corners of each of the upper lid and the lower lid, and the upper lid and the lower lid are sandwiched and tightened together with nuts provided on the upper lid side. Further, holes are formed at substantially the center of the upper lid and at the same position of the middle lid, which are used as injection holes when fixing plaster and injecting a denture base material from the outside of the flask by an injection molding method.

Prior Art Documents

[0005] [Patent Document 1] International Publication No. 2009 / 020156 [Patent Document 2] Japanese Patent Application Publication No. 2-224656 [Overview of the project] [Problems that the invention aims to solve]

[0006] As described above, conventional flasks are divided into upper and lower halves, and each of the four corners is secured with fasteners such as bolts and nuts. Therefore, when fabricating denture bases using many flasks, a large number of bolts and nuts are required, and it takes time to tighten four bolts and nuts on each flask.

[0007] Therefore, the present invention aims to provide a flask fixing device, a flask body for manufacturing dentures, and a method for manufacturing dentures that can easily fix multiple flasks for manufacturing dentures by tightening them at once. [Means for solving the problem]

[0008] The flask fixing device of the present invention comprises a base portion capable of arranging and placing multiple flasks for manufacturing denture bases, which are substantially rectangular in plan view and consist of a lower flask placed below and an upper flask placed on top of the lower flask; a cover portion that holds the flasks between itself and the base portion, the cover portion being supported by the base portion and opening and closing to allow the upper surface of the base portion to be released; and a locking portion that fixes the cover portion to the base portion.

[0009] According to the flask fixing device of the present invention, after arranging multiple flasks in a row on the base, the top surface of the base is closed with the cover and the cover is fixed to the base with the lock, making it possible to tighten and easily fix multiple flasks at once.

[0010] The cover portion preferably has side walls facing the four outer sides of the entire array of flasks placed side by side, while the base portion preferably has side walls on only three sides corresponding to the side walls of the cover portion. This allows multiple flasks to be slid onto the base portion starting from the side of the base portion that does not have side walls.

[0011] The flask assembly for manufacturing denture bases of the present invention comprises a flask fixing device and a flask, wherein the flask has an opening on the upper surface of the upper flask for pouring in unhardened plaster. According to the flask assembly for manufacturing denture bases of the present invention, while the upper flask is stacked on top of the lower flask, unhardened plaster can be poured one after another through the opening of each upper flask of multiple flasks arranged in a row. Furthermore, even if the poured plaster expands during hardening, it can escape through this opening of the upper flask.

[0012] Preferably, the flask has a notch on the upper end surface of the side wall of the lower flask that penetrates the side wall inward and outward. This allows for the placement of uncured plaster and wax temporary dentures in the lower flask, the placement of wax sprue forming members connected to the temporary dentures in the notch, and the placement of the upper flask on top of the lower flask to form the flask. After pouring uncured plaster into this flask and allowing it to harden, the flask body for denture base manufacturing is heated to melt and discharge the wax temporary dentures and wax sprue forming members, and a sprue for molding the denture base is formed by pressurizing and injecting resin through the notch in the flask.

[0013] The present invention provides a method for manufacturing a denture base using a flask body for manufacturing denture bases, which includes placing uncured plaster and a temporary denture made of wax in the lower flask, placing a wax sprue forming member connected to the temporary denture in the notch, sliding the flask body for manufacturing denture bases, which has the upper flask placed on top of the lower flask, onto the base from the side of the base that does not have a side wall, closing the top surface of the base with the cover and fixing the cover to the base with the lock, pouring uncured plaster from the opening of the upper flask and allowing it to harden, heating the flask body for manufacturing denture bases to melt and discharge the wax temporary denture and the wax sprue forming member, and injecting resin under pressure from the notch of the flask to form the denture base.

[0014] According to the denture base manufacturing method of the present invention, an uncured plaster and wax temporary denture is placed in the lower flask, a wax sprue forming member connected to the temporary denture is placed in the notch, and multiple flasks, with the upper flasks stacked on top of the lower flask, are slid onto the base from the side of the base that does not have a side wall and arranged side by side. Then the top surface of the base is closed with the cover and the cover is fixed to the base with the lock, so that multiple flasks can be tightened and fixed at once. With the upper flasks stacked on top of the lower flasks, uncured plaster can be poured in one after another from the opening of each of the upper flasks of the multiple flasks arranged side by side and cured. When the flask body for denture base manufacturing is heated to melt and discharge the wax temporary denture and wax sprue forming member, a sprue for molding the denture base is formed by pressurized injection of resin from the notch of the flask, so that the denture base can be molded by pressurized injection of resin from this notch of the flask. [Effects of the Invention]

[0015] (1) A flask fixing device comprising a base portion capable of arranging and placing multiple flasks for manufacturing denture bases, which are roughly rectangular in plan view and consist of a lower flask placed on the lower side and an upper flask placed on top of the lower flask, a cover portion that sandwiches the flasks between itself and the base portion, the cover portion being supported by the base portion and opening and closing to allow the upper surface of the base portion to be released, and a locking portion that fixes the cover portion to the base portion, allows multiple flasks to be tightened and fixed at once, eliminating the need for a large number of bolts and nuts when manufacturing denture bases using many flasks and significantly reducing working time.

[0016] (2) The cover portion has side walls that face the four outer sides of the entire set of flasks placed side by side, and the base portion has side walls on only three sides that correspond to the side walls of the cover portion. This makes it possible to easily place multiple flasks on the base portion by sliding them onto the base portion from the side of the base portion that does not have side walls, without having to lift the flasks.

[0017] (3) The flask holder comprises a flask, and the flask has an opening on the top surface of the upper flask for pouring in unhardened plaster. This allows unhardened plaster to be poured in one after another from the opening of each upper flask of multiple flasks arranged in a row, while the upper flask remains stacked on top of the lower flask, thus improving work efficiency. Furthermore, even if the poured plaster expands when it hardens, it can escape through this opening in the upper flask, preventing the flask from opening.

[0018] (4) The flask has a notch on the upper end surface of the side wall of the lower flask that penetrates the side wall inward and outward, which makes it easy to form a sprue for molding the denture base by pressurizing and injecting resin from the notch of the flask, thereby improving work efficiency. [Brief explanation of the drawing]

[0019] [Figure 1] This is a perspective view of a flask for manufacturing denture bases according to an embodiment of the present invention. [Figure 2] The perspective view of the state where the flask of FIG. 1 is disassembled into a lower flask and an upper flask. [Figure 3] The plan view of the flask body for denture base production in the embodiment of the present invention. [Figure 4] The right side view of FIG. 3. [Figure 5] The plan view of the state where the flask fixture of FIG. 3 is opened.

Embodiments for Carrying Out the Invention

[0020] FIG. 1 is a perspective view of a flask for denture base production in the embodiment of the present invention, and FIG. 2 is a perspective view of the state where the flask of FIG. 1 is disassembled into a lower flask and an upper flask.

[0021] As shown in FIGS. 1 and 2, the flask 1 for denture base production in the embodiment of the present invention is substantially rectangular parallelepiped (substantially rectangular in plan view). The flask 1 can be divided into upper and lower parts, and is composed of a lower flask 2 arranged on the lower side and an upper flask 3 arranged overlapping the lower flask 2. An opening 4 is formed on the upper surface of the upper flask 3. The opening 4 is for pouring uncured gypsum as described later. The opening 4 is preferably a through-hole with a size such that a circle with a diameter of 40 mm or more can be inscribed. The lower flask 2 and the upper flask 3 are formed of a metal such as brass, aluminum, or stainless steel.

[0022] The lower flask 2 has a bottom plate portion 20 substantially rectangular in plan view and a side wall portion 21 formed upward at the peripheral edge of the bottom plate portion 20. The lower flask 2 is surrounded by the bottom plate portion 20 and the side wall portion 21, and a recess 22 with an open upper surface is formed. The upper end surface 21A of the side wall portion 21 is in surface contact with the lower end surface 31A of the side wall portion 31 of the upper flask 3 described later.

[0023] Positioning pins 23A and 23B are erected on the upper end surface 21A of the side wall portion 21. The pins 23A and 23B are cylindrical in shape. The pins 23A and 23B are provided at two locations on the diagonally opposite corners of the upper end surface 21A of the side wall portion 21. In addition, notches 24 and 25 are formed on the upper end surface 21A of the side wall portion 21, penetrating the side wall portion 21 inward and outward. The notches 24 and 25 are semi-cylindrical notches.

[0024] The upper flask 3 has a top plate portion 30 that is roughly rectangular in plan view, and a side wall portion 31 formed on the periphery of the top plate portion 30 toward downward (Figure 2 is inverted). The aforementioned opening 4 penetrates the top plate portion 30. The upper flask 3 is surrounded by the top plate portion 30 and the side wall portion 31, forming a recess 32 with an open bottom. The lower end surface 31A of the side wall portion 31 is in surface contact with the upper end surface 21A of the side wall portion 21 of the lower flask 2.

[0025] The lower end surface 31A of the side wall portion 31 is provided with pin holes 33A and 33B into which pins 23A and 23B are fitted, respectively. The pin holes 33A and 33B are located at two diagonally opposite corners of the lower end surface 31A of the side wall portion 31. In addition, a notch 34 is formed on the lower end surface 31A of the side wall portion 31, penetrating the side wall portion 31 inward and outward. The notch 34 is a semi-cylindrical notch. The notch 34 is located in a position corresponding to the notch 24 of the lower flask 2, and when the upper flask 3 is placed on top of the lower flask 2, the notches 24 and 34 form a cylindrical through-hole.

[0026] Figure 3 is a plan view of the flask body for manufacturing denture bases in an embodiment of the present invention, Figure 4 is a right side view of Figure 3, and Figure 5 is a plan view of the flask fixing device in Figure 3 with the device open.

[0027] As shown in Figures 3 to 5, the flask body 5 for manufacturing a denture base in the embodiment of the present invention is formed by fixing the flask 1 shown in Figures 1 and 2 to a flask holder 6. The flask holder 6 has a base portion 7 on which multiple flasks 1 can be arranged in a row, a cover portion 8 that holds the flask 1 between itself and the base portion 7, and a locking portion 9 that fixes the cover portion 8 to the base portion 7.

[0028] The base portion 7 has a rectangular bottom plate portion 70 on which multiple flasks 1 are placed side by side, and side wall portions 71A, 71B, and 71C erected on the periphery of the bottom plate portion 70. An opening 70A is formed in the bottom plate portion 70. The opening 70A is rectangular in shape. It is desirable to make the opening 70A as large as possible to reduce weight, but it is formed so as not to interfere with the support of the flasks 1.

[0029] The side walls 71A, 71B, and 71C are positioned opposite the three outer surfaces (the upper, left, and lower surfaces, excluding the right side in Figure 5) of the entire flask 1 when multiple flasks are placed side by side. In addition, guide plates 72 are provided on the inside of the upper side wall 71A and the lower side wall 71C in Figure 5, respectively, to adjust the gap with the flask 1.

[0030] The cover portion 8 has a top plate portion 80 that presses down on the top surface of multiple flasks 1 placed side by side on the bottom plate portion 70 of the base portion 7, and side wall portions 81A, 81B, 81C, 81D erected on the periphery of the top plate portion 80. The cover portion 8 is supported by the base portion 7. The cover portion 8 is supported by the base portion 7 so as to be openable and closable by a hinge 10. The cover portion 8 opens and closes so as to be able to release the top surface of the base portion 7.

[0031] An opening 80A is formed in the top plate portion 80. The opening 80A is rectangular in shape. The opening 80 is sized so that the opening 4 of the flask 1 is exposed when the flask 1 is placed on the bottom plate portion 70 of the base portion 7 and the cover portion 8 is closed.

[0032] The side walls 81A, 81B, 81C, and 81D are positioned opposite the four outer surfaces of the entire flask 1, which is arranged in a row on the bottom plate 70 of the base 7. In other words, the side walls 71A, 71B, and 71C of the base 7 are provided only on three surfaces corresponding to the side walls 81A, 81B, and 81C of the cover 8. In addition, guide plates 82 for adjusting the gap with the flask 1 are provided on the inside of the lower side wall 81A and the upper side wall 81C in Figure 5.

[0033] Next, a method for manufacturing a denture base using the flask 5 for denture base manufacturing with the above configuration will be described.

[0034] (1) Place the uncured plaster and wax temporary denture in the lower flask 2 shown in Figure 2, and place the wax sprue forming member that connects to the temporary denture in the notch 24. At this time, if necessary, place the wax sprue forming member in the notch 25 as well.

[0035] (2) The upper flask 3 is placed on top of the lower flask 2. At this time, the positions of the pin holes 33A and 33B of the upper flask 3 are aligned with the positions of the pins 23A and 23B of the lower flask 2, so that the pin holes 33A and 33B and the pins 23A and 23B fit together, and the upper flask 3 is positioned relative to the lower flask 2.

[0036] (3) The flask 1, in which the upper flask 3 is placed on top of the lower flask 2, is slid onto the bottom plate 70 of the base portion 7 of the flask fixing device 6 in Figure 5 from the right side of the base portion 7, that is, from the open portion 73 side which does not have side walls 71A, 71B, 71C. Since the open portion 73 does not have side walls 71A, 71B, 71C, the worker can place the flask 1 on the bottom plate 70 by sliding it from the open portion 73 without lifting it.

[0037] (4) After placing the multiple flasks 1 on the base portion 7, the top surface of the base portion 7 is closed with the cover portion 8, and the cover portion 8 is fixed to the base portion 7 with the lock portion 9. This forms a denture base manufacturing flask body 5 in which the multiple flasks 1 are integrated. As shown in Figure 4, since the side wall portion 71D of the upper flask 3 is located above the opening portion 73 of the denture base manufacturing flask body 5, the flasks 1 will not fall out of the opening portion 73.

[0038] (5) Pour the unhardened plaster into the opening 4 of flask 1 (upper flask 3) and allow it to harden. At this time, since the openings 4 of all the flasks 1 that are placed side by side are exposed at the opening 80A of the cover part 8 of the flask body 5 for denture base manufacturing, the unhardened plaster can be poured into each flask 1 one after another. In addition, even if the poured plaster expands when it hardens, it can escape through this opening 4, preventing flask 1 from opening. If the opening 4 is a large opening that can accommodate a circle with a diameter of 40 mm or more, pouring the plaster will be easier. The shape of the opening 4 can be circular, elliptical, polygonal, etc.

[0039] (6) The flask body 5 for manufacturing the denture base is heated to melt and discharge the wax temporary denture and the wax sprue forming member. This creates sprues for molding the denture base by pressurizing the injection of resin from the notches 24, 25, and 34 of the flask 1, and the denture base is then molded by pressurizing the injection of resin from the notches 24, 25, and 34 of the flask 1.

[0040] As described above, the flask fixing device 6 in this embodiment allows multiple flasks 1 to be tightened and fixed at once, eliminating the need for a large number of bolts and nuts when fabricating a denture base using many flasks 1, and significantly reducing working time. [Industrial applicability]

[0041] The present invention is useful as a flask holder for fixing a flask used in the manufacture of denture bases, as well as a flask body for manufacture of denture bases and a method for manufacture of denture bases, and is particularly suitable for a method of manufacture of denture bases that uses multiple flasks for manufacture of denture bases. [Explanation of Symbols]

[0042] 1 Flask 2. Lower flask 3. Upper flask 4 openings 5. Flask body for manufacturing denture bases 6. Flask holder 7 Base section 8. Cover section 9 Locking part 10 hinges 20 Bottom plate part 21 Side wall section 22 recess 23A, 23B pins 24,25 Notches 30 Top plate section 31 Side wall section 32 recesses 33A, 33B pin holes 70 Bottom plate part 70A opening 71A, 71B, 71C Side wall part 72 Guide Plate 73 Liberation Department 80 Top panel 81A, 81B, 81C, 81D Side wall part 82 Guide plate

Claims

1. A base section on which multiple flasks for manufacturing denture bases, each having a roughly rectangular shape in plan view and consisting of a lower flask positioned below and an upper flask positioned on top of the lower flask, can be placed side by side. A cover portion that sandwiches the flask between itself and the base portion, and is supported by the base portion, and the cover portion opens and closes so as to be able to open the upper surface of the base portion, A locking part that secures the cover part to the base part A flask holder having

2. The cover portion has side walls that face the four outer surfaces of the entire flasks that are placed side by side. The base portion has side walls on only three surfaces corresponding to the side walls of the cover portion. Flask holder according to claim 1.

3. A flask holder according to claim 1 or 2, The flask comprises the aforementioned flask, The flask has an opening on the upper surface of the upper flask for pouring in unhardened gypsum. Flask body for manufacturing denture bases.

4. The flask body for manufacturing a denture base according to claim 3, wherein the opening is a through hole large enough to accommodate a circle with a diameter of 40 mm or more.

5. The flask body for manufacturing a denture base according to claim 3, wherein the flask has a notch on the upper end surface of the side wall of the lower flask that penetrates the side wall inward and outward.

6. A method for manufacturing a denture base using the flask body for manufacturing a denture base according to claim 5, The flask for manufacturing a denture base, in which an uncured plaster and wax temporary denture is placed in the lower flask, a wax sprue forming member connected to the temporary denture is placed in the notch, and the upper flask is placed on top of the lower flask, and the flask is slid onto the base from the side of the base that does not have a side wall. The cover portion closes the upper surface of the base portion, and the locking portion secures the cover portion to the base portion. The unhardened plaster is poured through the opening of the upper flask and allowed to harden. The flask body for manufacturing the denture base is heated to melt and discharge the wax temporary denture and the wax sprue forming member. The denture base is formed by pressurizing and injecting resin through the notch in the aforementioned flask. A method for manufacturing a denture base, including the following:

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