JP2003211529A - Molder for mouthpiece and molding method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a molder for a mouthpiece, mixing of air in which is impeded and which has a highly molding accuracy, and its molding method. <P>SOLUTION: This molder for the mouthpiece is equipped with an upward open container 1, a lid member 5 for covering the container, a mouthpiece molding sheet 9, which lies between the lid member and the container and separates a lid member side space S1 from a container side space S2, a cylinder 16 formed vertically on the bottom of the container, a piston 17c housed in the cylinder, a jaw mold supporting base plate 19 vertically moving in the container side space in interlocking with the piston, a first air valve 28 mounted on the lid member, a second air valve 29 mounted on the upper container, a third air valve 30 for switching the charging and discharging air to and from the lower space of the piston mounted to the cylinder and a vacuum pump 31 for sucking the air in the lid member side space and that in the container side space through the first and the second air valves. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a mouthpiece molding machine and a molding method.

[0002]

2. Description of the Related Art Recently, in the field of dentistry, sports mouthpieces (referred to as mouthguards) are being reviewed as part of preventive medicine. In karate, etc., wearing of these mouthpieces is obligatory. Even in contact-type competitions, wearing mouthpieces is being encouraged, and it is becoming widespread throughout the sports field. Further, in accordance with such a tendency, a mouthpiece having a high morphological accuracy is required in order to further improve the function of protecting the jaw and teeth by the mouthpiece and reduce the discomfort during wearing as much as possible. Such a mouthpiece with high morphological accuracy is a method in which a dentist takes an impression of a user's (athlete's) upper and lower jaw model to create a plaster model, and a technician creates a mouthpiece based on this model. Is taken.

The mouthpiece is used not only for protecting teeth in sports, but also for treating temporomandibular disorders and occlusal disorders (referred to as splint), and for preventing tooth gribbing during sleep. The mouthpiece is used as a general term for those used in these various applications.

An example of this type of mouthpiece molding machine is disclosed in Japanese Utility Model Registration No. 2569263. This is the part that constitutes the articulator, the lower jaw model attachment plate part is stored in the container, for example, the lower jaw model is attached to this jaw model attachment plate, and the softened mouth guard molding sheet is placed on this, The mouth of the container is covered with a rubber sheet, air in the container is sucked, and the mouth guard is molded by suction deformation of the rubber sheet. On the other surface of the mouthpiece, a tooth occlusal surface is formed by pressing, for example, an upper jaw model attached to the upper jaw model mounting plate.

[0005]

In such a mouthpiece molding machine, the molded sheet is pressed against the jaw model and molded by sucking the air in the container covered with the rubber sheet into a vacuum state. However, in the initial stage of suction (low vacuum state), when air is still left in the interdental papilla part, it may be covered with the deformed molded sheet and trap air therein. The trapped air causes air bubbles and also causes defective molding, resulting in impaired molding accuracy.

The present invention has been made in consideration of the above problems, and provides a mouthpiece molding machine and a molding method which enable molding in a high vacuum state and suppress molding defects due to inclusion of air bubbles and air retention. It is provided.

[0007]

A mouthpiece molding machine according to the present invention (Claim 1) comprises a container having an open upper portion,
A lid member covering the container to form a sealed space; a mouthpiece molding sheet interposed between the lid member and the container to separate the sealed space into a lid member side space and a container side space; A cylinder vertically formed on the bottom of the container, a piston that is housed in the cylinder and moves up and down, a jaw model support substrate that moves up and down in the space on the container side in association with the piston, and is attached to the lid member. A first air valve and a second air valve attached to the container
An air suction means for sucking air in the lid member side space and the container side space via an air valve, a third air valve attached to the cylinder for supplying and exhausting a space below the piston, and the first and second air valves. In a state where the space on the lid member side and the space on the container side are made vacuum, air is introduced into the space below the piston through the third air valve to raise the piston and attached to the jaw model support substrate. The jaw model is pressed against the mouthpiece molding sheet that is ready for molding to mold it.

In such a construction, the lid member is removed, the plaster frame model is placed on the jaw model support substrate, and the mouthpiece molding sheet in a moldable state is interposed between the lid member and the container. The container is covered and hermetically sealed, the first and second air valves are opened, and air in the lid member space and the container internal space is exhausted by the air suction means to establish a vacuum state. Next, when the third air valve is opened and air is introduced into the space below the piston of the cylinder, the air pressure pushes the piston upward, the jaw model support substrate rises, the jaw model comes into contact with the forming sheet, and further pushes it up. The formed sheet deforms along the surface of the jaw model under vacuum. Next, the second air valve is closed and the first air valve is opened in a state where the space on the container side is kept vacuum, and air is introduced into the space on the lid member side. As a result, a pressing force by air pressure is applied to the formed sheet from the lid member space, and a suction force is applied from the container side space, and the formed sheet is formed as if it comes into close contact with the jaw model.

In the mouthpiece molding machine according to the present invention (claim 2), the lid member side space and the piston are provided through the locking means for fixing the lid member to the container, the first air valve and the third air valve. A compressor for introducing high-pressure air is provided in the lower space. In such a structure, high-pressure air is introduced into the lid member side space via the first air valve, and the pressing force on the molded sheet increases. Further, high-pressure air is introduced into the cylinder space through the third air valve to increase the lifting force of the jaw model support substrate, which opposes the high-pressure air pressure in the lid member side space. That is, the substrate does not fall due to the increase in the air pressure in the lid member side space. The locking means prevents the lid member from opening due to the increased air pressure in the lid member side space.

The mouthpiece molding machine according to the present invention (claim 3) is provided with a stopping means for stopping the ascent of the jaw model support substrate when the surface of the jaw model support substrate coincides with the sheet mounting surface. It is something that is done. In such a structure, the jaw model support substrate rises through the piston due to the introduction of air into the cylinder space, and is stopped by the stop means, and the upper limit position is restricted by the above position. This upper limit position is set to the optimum molding position.

A mouthpiece molding machine according to the present invention (claim 4) is a sheet mounting surface for mounting the periphery of the mouthpiece molded sheet formed on the upper end of the container, and a sheet mounting surface. A sheet pressing plate that presses the periphery of the placed mouthpiece molding sheet and a spring member that is provided at the lower end of the lid member and that elastically presses the sheet pressing plate are provided. In such a configuration, the molded sheet is placed on the sheet mounting surface, and the sheet pressing plate is further stacked. The periphery of the formed sheet is pressed by the sheet pressing plate, and the formed sheet is sandwiched between the sheet mounting surface and the sheet pressing plate and is prevented from falling into the container. When the lid member is placed on the container, the sheet pressing plate is elastically pressed by the spring member, and the formed sheet is pressed more strongly against the sheet mounting surface, and the formed sheet comes into close contact with the sheet mounting surface and its support is more reliable. To be taken.

A mouthpiece former according to the present invention (claim 5) is a pair of jaws for supporting a pair of jaws on the inner surface of the lid member, the pair of jaws facing the jaw model attached to the jaw model support substrate. A model support table is attached, and the shape of the occlusal surface of the above-mentioned opposing teeth is marked on the sheet when the mouthpiece molded sheet is formed. In such a configuration, when the jaw model rises to the upper limit position, the distance between the upper and lower jaw models becomes a preset value, and the occlusal surface of the tooth is marked by the abutment jaw model contacting the surface of the forming sheet.

According to the present invention (claim 6), a container whose upper part is opened, a lid member which covers the container to form a sealed space, and the lid member and the container are interposed between the container and the hermetically sealed container. A mouthpiece molding sheet for separating the space into a lid member side space and a container side space, a cylinder vertically formed at the bottom of the container, a piston housed in the cylinder and moving up and down, and in conjunction with the piston. The jaw model support substrate that moves up and down in the space on the container side, the first air valve attached to the lid member, the second air valve attached to the container, and the piston attached to the cylinder to the space below. Third to open and close the exhaust
A mouthpiece molding method using a mouthpiece molding machine comprising an air valve and air suction means for sucking air in the space on the lid member side and the space on the container side via the first and second air valves, the lid member A step of installing the mouthpiece molding sheet that is softened and can be molded between the container and the container, and after covering the container with the lid member to form a sealed space, the above-mentioned via the first and second air valves A step of evacuating the lid member side space and the container side space by air suction means, introducing air into the piston lower space of the cylinder through the third air valve, and making a difference between the space and the container inner space. Using the pressure to raise the piston, press the jaw model attached to the jaw model supporting substrate against the mouthpiece forming sheet to form it, the container side While in a state of maintaining the vacuum through the first air valve to the lid member side space by introducing air,
Pressing the mouthpiece-molded sheet against the jaw model with the air pressure. In such a configuration, the forming of the formed sheet is performed under vacuum, and the invasion of air between the jaw model and the formed sheet is prevented. Further, during molding, air pressure in the container on the lid member side is applied to the molded sheet from above, and suction force due to the container side space (vacuum) is applied to the lower side, and these two kinds of forces act as molding force.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In FIGS. 1 to 4, 1 is a container having a cylindrical shape with an open upper side, 2 is a flat circular sheet mounting surface projecting from the outer periphery of the upper end of the container 1, Three
Is a sealing material made of a rubber ring or the like attached to the outside of the sheet mounting surface 2, and 4 is a leg provided on the bottom surface of the container 1. Reference numeral 5 denotes a cylindrical lid member 5 and 6 which covers the container 1 and contacts with the sealing member 3 to form a sealed space between the lid member 5 and a flange portion formed at a lower end of the lid member 5. , Is opposed to the sheet mounting surface 2 of the container 1 and contacts the sealing material 3.

Numeral 7 is a locking means provided on the outside of the sheet mounting surface 2 of the container 1 for elastically sandwiching the sheet mounting surface 2 and the flange portion 6 so as to fix the lid member 5 to the container 1 and the sealing material 3. While improving the sealing function, the lower surface of the flange portion 6 is brought into contact with the sheet mounting surface 2. At this time, it is necessary that the sheet mounting surface 2 and the lower surface of the flange 6 contact each other. This is to keep the space between the upper and lower jaw models described below at a set value. The locking means 7 has a structure in which one end thereof is made of a curved metal body rotatably attached to the container side, and the other end is a free end to press the flange portion 6 from the outside by utilizing its spring property. Have. Both the lid member 5 and the container 1 can be made of metal. Reference numeral 8 is a pressure relief valve attached to the upper surface of the lid member 5.

Reference numeral 9 denotes a mouthpiece molding sheet (hereinafter simply referred to as a molding sheet) placed on the sheet placing surface 2 and having elasticity such as a thermoplastic polyolefin elastomer and ethylene vinyl acetate copolymer (EVA). It is formed of a thermoplastic resin or a thermoplastic hard resin such as polymethylmethacrylate resin. The thermoplastic resin having elasticity is mainly used as a mouth guard material, and the hard resin is mainly used as a splint material. The molded sheet 9 is heated and softened in advance so that it can be molded and is placed on the sheet placing surface 2, and then the lid member 5 is put on. The molded sheet 9 has a disk shape with a thickness of about 1 to 5 mm, and the thickness is adjusted according to the application or case. For sports mouth guards, a thickness of about 2-3 mm is common.
By fixing the molded sheet 9 to the sheet mounting surface 2,
The sealed space is divided into a lid member side space S1 and a container side space S2.

A sheet pressing plate 10 is placed on the sheet mounting surface 2 portion of the formed sheet 9 and is placed on the formed sheet 9, and is composed of a flat circular metal ring. The molded sheet 9 is heated and softened by the heater 11 (FIG. 1) while being pressed by the pressing plate 10 in the open state. As the heater 11, an ordinary heater such as a nichrome wire heater or a ceramic heater is used in a planar shape. Reference numeral 12 is a spring member provided at the lower end of the lid member 5, and includes a coil spring 14 and a pressing pin 15 housed in a hole 13 formed in the lid member 5, and the lower end of the pressing pin 15 is the coil spring 14 The sheet pressing plate 10 is pressed by elastically projecting downward from the surface of the flange portion 6 under the force of By pressing the sheet pressing plate 10, the spring member 12
While closely adhering the molded sheet 9 to the sheet mounting surface 2,
Make sure that the molded sheet 9 is fixed.

Reference numeral 16 denotes a cylindrical cylinder formed vertically downward in the bottom of the container 1 and has an upper end in the container-side space S2.
Is in communication with. Reference numeral 17a denotes a cylindrical piston housed in the cylinder 16 and moves in the cylinder 16 closely in the vertical direction. 17b is a piston rod,
18 is a piston rod 17b at the bottom of the inner surface of the container 1.
A seal material such as an oil seal that slidably contacts the container side space for separating and blocking the container side space S2 and the cylinder space.

Reference numeral 19 denotes a forehead model support substrate (hereinafter simply referred to as a support substrate) which is detachably fixed to the upper end of the piston rod 17b, and is formed in a circular flat plate shape with a resin plate or a metal plate, and its outer periphery is It is close to or in sliding contact with the inner wall surface of the container 1. Reference numeral 20 is a jaw model attached to the support substrate 19, which is an impression taken from the oral cavity of a sports player or a patient and is formed of gypsum. The model on the side where the mouthpiece is manufactured, the illustrated example Then it is the upper jaw model. Reference numeral 21 is a magnet embedded in the bottom surface of the jaw model 20. In the case of splint production, a lower forehead model is attached to the support substrate 19 because it is often attached to the lower jaw.

As shown in FIG. 4, 22 is a magnet embedded in the center of the support substrate 19, 23 is a circular recess formed at three locations around the magnet 22, and 24 is a plurality of through holes formed at arbitrary locations. Is a small hole, and serves to facilitate the suction of air on the upper surface of the instruction substrate 19, that is, between the support substrate 19 and the molding sheet 9. The magnet 22 is the magnet 21 on the jaw model 20 side.
Adsorb to. Further, the jaw model 20 is formed with three circular convex portions 25 on the bottom surface thereof, which match the recesses 23 of the support substrate 19 and the jaw model 20 with respect to the support substrate 19.
The position of is determined.

Numeral 26 is a stopper formed at the upper end of the inner surface of the cylinder 16 and comes into contact with the piston 17a when it is raised. The stopper 27 determines the upper limit position of the support substrate 19. At this upper limit position, FIG.
As shown in, the surface of the support substrate 19 and the sheet mounting surface 2 are aligned and have the same height. That is, when the heights of the both do not match, a step may be formed there and the molded sheet adhered thereto may be broken. However, such an accident can be prevented by matching the surfaces of the two. The stopper 26 acts as a stopping means for the support substrate 19.

Numeral 28 is a first air valve attached to the lid member 5 for introducing air into the lid member side space S1, and numeral 29 is a second air valve attached to the container 1 for introducing air into the container side space S2.
An air valve 30 is a third air valve which is attached to the cylinder 16 and which opens and closes the supply and exhaust of the space below the piston 17a, that is, the cylinder space S3 (FIG. 3).

31 is the first and second air valves 28 and 29.
It is a vacuum pump that sucks air in the lid member side space S1 and the container side space S2 via the, and functions as air suction means. 32
Is a vacuum gauge. The term "vacuum" includes not only a complete vacuum but also a state in which the degree of vacuum is considerably high. The vacuum gauge 32 may be provided on the rear side of the second air valve 29 (on the left side of the second air valve 29 in the drawing) in consideration of the case where the vacuum pump 31 is constantly driven. 33 is the first,
This is a compressor for introducing high-pressure air into the lid member side space S1 and the cylinder space S3 via the third air valves 28 and 30. The first air valve 28 is a three-stage switching structure for the vacuum pump 31, the compressor 33 and the outside air, the second air valve 29 is a two-stage switching structure for the vacuum pump 31 and the outside air, and the third air valve 30 is two stages between the compressor 33 and the outside air. It has a switching structure.

Reference numeral 34 denotes a jaw model support fixed to the inner surface (ceiling) of the lid member 5, which is arranged at a position facing the support substrate 19 on the side of the container 1. Like the support substrate 19, a magnet 35 for attraction and Three spherical depressions 36 for alignment are formed. Reference numeral 37 is a jaw model that is attracted to the support base 34 by a magnet 38, and in this case, a lower jaw plaster model that is an opposing tooth of the upper jaw model. When manufacturing the upper and lower jaw models 20 and 37, the positional relationship between them, such as biting with an articulator, and a necessary interval (corresponding to the thickness of the mouthpiece) are preset.

Next, a method of molding a mouthpiece using the molding machine having the above structure will be described in order with reference to FIGS.

A. Using the articulator, the plaster models 20 and 37 in which the upper and lower jaw positions are fixed with plaster are prepared. At this time, the check bite is used to determine the interval (for example, about 2 mm) raised by the mouthpiece. For this articulator, a split cast (with magnet) having the same shape as the above-mentioned support substrate 19 and support base 34 is used.

B. The lid member 5 is removed from the container 1, and the upper and lower jaw models 20 and 37 are fixed to the support substrate 19 and the support base 34, respectively. At this time, the jaw model on the side where the mouthpiece is manufactured, in this case the upper jaw model 20, is attached to the support substrate 19. The support substrate 19 and the support base 34 are of the same shape as the support base of the articulator, and are set at the same positions. After the jaw model is attached, the support substrate 19 is pushed down to the lowest position.

C. The molded sheet 9 is placed on the sheet mounting surface 2, and the pressing plate 10 is placed on the sheet to fix the molded sheet 9, and then the heater 11 is brought close to directly above the molded sheet 19. This is softened by heating (Fig. 1).

D. When Morteno (registered trademark), which is a thermoplastic polyolefin-based elastomer, is used as the molded sheet 19, when it is softened by heating, it becomes transparent and the central portion hangs down in a circular shape. When this happens, stop heating and cover the container 1 with the lid member 5,
Both are fixed by the lock means 7 (FIG. 2).

E. The first and second air valves 28 and 29 are switched to the vacuum pump 31 side, the vacuum pump 31 is driven, and the air in the lid member side space S1 and the container side space S2 is suctioned and exhausted to a vacuum state. At this time, the third air valve 30 is closed.

F. With the vacuum gauge 32, the lid member side space S1
And confirm that the container side space S2 has reached a high vacuum.
The air valve 30 is switched to the outside air side, and the outside air is introduced into the cylinder space S3. At this time, the second air valve 29 is set on the vacuum pump 31 side, and the container side space S2 is continuously vacuumed. The piston 17a rises due to the differential pressure between the container side space S2 and the cylinder space S3, pushes up the support substrate 19, hits the stopper 26, and stops.
At this time, the jaw model 20 abuts the jaw model 37 at an interval (for example, about 2 mm) initially set by the articulator, and the occlusal surface of the occlusal teeth of the jaw model 37 is marked on the surface of the molding sheet 9.
Next, the first air valve 28 is switched to the outside air side to introduce the outside air into the lid member side space S1. Thus, the molded sheet 9 is strongly pressed against the surface of the jaw model and molded. At this time, since the vacuum state is maintained between the jaw model 20 and the formed sheet 9, the sheet material is also filled in a narrow space such as an interdental papilla or an undercut portion. Further, air mixing into the molded sheet 9 itself is prevented. (Figure 3).

G. Next, the compressor 33 is driven to switch the first and third air valves 28, 30 to the compressor 33 side. As a result, high pressure air is introduced into the lid member side space S1 and the cylinder space S3. By increasing the pressure of the lid member side space S1, the pressing force on the forming sheet 9 increases, and the forming accuracy improves. At this time, the cylinder space S3 is also made to have a high pressure at the same time in order to prevent the support substrate 19 from being lowered by being pushed by the air pressure of the lid member side space S1. When the air pressure in the lid member side space S1 reaches a preset constant pressure, the air relief valve 8 opens and the air is exhausted. This is to prevent an abnormal increase in pressure in the lid member side space S1. The introduction of the high-pressure air by the compressor 33 into the lid member side space S1 and the cylinder space S3 is performed to further improve the molding accuracy, and the mouthpiece of a complicated shape having a deep undercut is used. Suitable for molding. A pressure reducing valve may be provided on the output side of the first air valve 28 instead of the air escape valve 8. However, when molding a normal mouthpiece, the required molding accuracy can be obtained even when these are set to atmospheric pressure. In this case, the locking means 7 becomes unnecessary.

H. After completion of molding, the vacuum pump 31 is stopped, the second air valve 29 is opened to the outside air side, and the outside air is introduced into the container side space S2. Further, the first and third air valves 28, 30
Is switched to the outside air side and the high pressure air in the lid member side space S1 and the container side space S2 is exhausted and returned to the atmospheric pressure. Then the locking means 7
Is released, the lid member 5 is opened, the sheet pressing plate 10 is removed, the molded mouthpiece is removed together with the jaw model 20, and unnecessary portions at the edges are cut off to complete the mouthpiece.

By using the molding machine and molding method described above, a laminated mouthpiece can be easily manufactured. The mouthpiece having a laminated structure has an advantage of improving its function, for example, by thickening the front tooth portion which needs protection in a sports mouthguard. A mouthpiece having such a structure usually has a two-layer structure of a molded sheet. However, in the conventional molding machine or molding method, air is introduced between the molded sheet of the first layer and the molded sheet of the second layer during molding. However, there is a problem that air bubbles remain inside the mouthpiece or the adhesive strength between layers becomes insufficient. Both the inclusion of air bubbles and the decrease in adhesive strength cause a decrease in the strength of the mouthpiece.

When manufacturing a mouthpiece having a laminated structure, the mouthpiece part of the first layer (for example, only the front tooth part is covered) is manufactured by the above-mentioned method, and this is fixed to the support plate while being fixed to the jaw model. It is formed by covering the anterior teeth and the posterior teeth with the second-layer molding sheet. Since the second-layer molded sheet covers the first-layer mouthpiece portion in a vacuum state, there is no possibility of air remaining between the two, and a mouthpiece having sufficient adhesive strength and no bubbles can be produced.

[0036]

EFFECTS OF THE INVENTION According to the present invention, the jaw model is covered with the forming sheet in a vacuum state so that air is not present or is extremely diluted between them, and only the outer space of the forming sheet has a high pressure. By pressing the molded sheet, the sheet material is filled even in a minute space such as an interdental papilla, and a highly accurate mouthpiece in which no bubbles enter can be manufactured. In particular, it is extremely effective when applied to the production of a laminated mouthpiece whose thickness is adjusted for the purpose of improving the tooth and jaw protecting function of the mouthpiece. Further, since the occlusal surfaces of the opposing teeth can be accurately and easily marked on the molded sheet simultaneously with the molding, the upper and lower teeth can be occluded stably via the mouthpiece.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a container of a mouthpiece molding machine according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view showing an initial state of molding in which the lid member is put on the container of the mouthpiece molding machine according to the embodiment of the present invention.

FIG. 3 is a cross-sectional view showing a completed state of molding.

FIG. 4 is a perspective view showing a support substrate.

[Explanation of symbols]

1 ... Container 2 ... Sheet mounting surface 3,18 ......... Sealant 4 ......... legs 5 ... Lid member 6 ... Flange part 7 ......... Locking means 8 ... Pressure relief valve 9 ………… Molded sheet 10 ... Sheet press plate 12 ... Spring member 16 ………… Cylinder 17a ......... Piston 17b ......... Piston rod 19 ... Support substrate 20, 37 ... chin model 21, 22, 35, 38 ... Magnets 26 ………… Stopper 28, 29, 30 ... 1st, 2nd, 3rd air valves 28 ......... void 31 ......... Vacuum pump 33 ......... Compressor 34 ... Supporting stand S1 ……… Space on the lid member side S2 ……… Container side space S3 ……… Cylinder space

Continuation of front page (51) Int.Cl. ⁷ Identification code FI theme code (reference) B29L 31:00 A61C 19/00 M

Claims (6)

[Claims] 1. A container having an open upper part, a lid member covering the container to form a sealed space, and a lid member side space interposed between the lid member and the container. A mouthpiece molding sheet that separates into a container-side space, a cylinder vertically formed on the bottom of the container, a piston that is housed in the cylinder and moves up and down, and a piston that moves up and down in the container-side space in conjunction with the piston. A jaw model support substrate, a first air valve attached to the lid member, a second air valve attached to the container, and a third air valve attached to the cylinder for opening and closing the air supply and exhaust to the space below the piston. An air valve and an air suction means for sucking air in the space on the lid member side and the space on the container side via the first and second air valves are provided, and the lid member side space and the container side. In a state where the space is in a vacuum, air is introduced into the space below the piston through the third air valve to raise the piston, and the jaw model attached to the jaw model support substrate can be molded. A mouthpiece molding machine that presses against a molding sheet to mold it 2. A compressor for introducing high-pressure air into the space on the side of the lid member and the space below the piston via the locking means for fixing the lid member to the container, the first air valve and the third air valve is provided. The mouthpiece molding machine according to claim 1, wherein 3. The mouthpiece molding according to claim 1, further comprising stop means for stopping the ascent of the jaw model support substrate when the surface of the jaw model support substrate coincides with the sheet mounting surface. vessel 4. A sheet mounting surface for mounting the periphery of the mouthpiece molding sheet formed on the upper end of the container, and a sheet for pressing the periphery of the mouthpiece molding sheet mounted on the sheet mounting surface. 4. The mouthpiece molding machine according to claim 1, further comprising a pressing plate and a spring member provided at a lower end of the lid member for elastically pressing the sheet pressing plate. 5. An opposing tooth jaw model support base for supporting an opposing tooth jaw model opposite to the jaw model attached to the jaw model supporting substrate is attached to an inner surface of the lid member, and the mouthpiece forming sheet The mouthpiece molding machine according to any one of claims 1 to 4, wherein the occlusal surface shape of the opposing teeth is marked on the sheet during molding. 6. A container having an open upper part, a lid member covering the container to form a sealed space, and a lid member side space interposed between the lid member and the container. A mouthpiece molding sheet that separates into a container-side space, a cylinder vertically formed on the bottom of the container, a piston that is housed in the cylinder and moves up and down, and a piston that moves up and down in the container-side space in conjunction with the piston. A jaw model support substrate, a first air valve attached to the lid member, a second air valve attached to the container, and a third air valve attached to the cylinder for opening and closing the air supply and exhaust to the space below the piston. A mouthpiece molding machine provided with an air valve and air suction means for sucking air in the space on the lid member side and the space on the container side via the first and second air valves. A method of forming a us piece, wherein the step of installing the mouthpiece molding sheet that is softened and moldable between the lid member and the container, after covering the container with the lid member to form a sealed space, A step of applying a vacuum to the lid member side space and the container side space by the air suction means via the first and second air valves, and introducing air into the space below the piston of the cylinder via the third air valve. The step of raising the piston by utilizing the pressure difference between the space and the space inside the container, and pressing the jaw model attached to the jaw model supporting substrate against the mouthpiece forming sheet to form the same, the container Air is introduced into the lid member side space through the first air valve while the side space is kept vacuum, and the mouthpiece molding sheet is pressed against the jaw model by the air pressure. That process, a mouthpiece molding method comprising