JPWO2009020156A1 - Dental flask, resin denture base manufacturing method, and denture base molding apparatus - Google Patents

Abstract

Abstract: Flask (900) consists of two machined flask halves (91,92). Each flask half is for a wide plaster mold having a flat inner surface (911, 921), a recess (904) to which the resin injection tube fits, and a flat surface (913, 923) of a predetermined depth formed on the inner surface. A recess (912, 922); and a resin injection hole (906) for communicating the fitting recess and the wide recess. The edge (915,925) of the gypsum mold recess on the flat inner surface connects the three sides (S1, S2, Sb) respectively corresponding to the partial lines of the three sides of the triangle and the adjacent sides. It has three arcuate corners (Ct, Cb1, Cb2). The two sides (S1, S2) are inclined so as to spread from the corner (Ct) on the resin injection hole side toward the other two corners (Cb1, Cb2). The wide recess has a shape suitable for placing the anterior tooth portion of the denture base on the corner side of the resin injection opening and placing the throat portion of the denture base on the other two corner sides. Have. [Selection] Figure 9

Description

  The present invention relates to a dental flask used for producing a resin denture base, and a method for producing a resin denture base using the flask.

  In order to produce a denture base made of resin (resin), first, a gypsum model representing the shape of the patient's oral cavity and an occlusal floor made of wax (wax such as paraffin) mounted thereon are placed in an articulator, Artificial teeth (dentures) are arranged in wax according to the occlusal floor, a temporary denture base is produced, and the temporary base trial is performed.

  Thereafter, a metal dental flask consisting of two halves is prepared. Each flask half is usually cast by casting. Thereafter, the temporary denture is placed in a metal dental flask, and an uncured dental plaster is filled around the temporary denture to be cured, thereby producing a gypsum mold. At that time, the uncured gypsum can be separated into two mold halves (mold halves) corresponding to the flask halves after curing. Thereafter, the two flask halves are temporarily separated, and the wax temporary denture is heated and melted and discharged. Thereby, a cavity for denture base molding is formed in the plaster mold in the flask.

  Resins for denture base materials typically include those of a room temperature polymerization type, a heat polymerization type, and a thermoplastic type. As a denture base material, for example, acrylic resin powder and acrylate ester are mixed well, and after doughing, that is, into a bowl shape, put into a resin injection tube or cylinder container, and pressurize and fill the cavity in the dental flask And cured to form a resin-made denture base. As a denture base material, for example, a thermoplastic resin such as polycarbonate is put in a resin injection tube or a cylinder container, heated and melted, and pressurized and filled in a cavity in a dental flask, and is made of resin. Mold the denture base.

  Conventionally, in denture base molding, a doughed resin material in a resin injection tube is pressurized and filled into a cavity in a dental flask by a hydraulic pressure rod.

In a known method for producing a denture base or the like, polycarbonate is used as the resin. This is softened by heating and then pressed into a plaster mold of a denture base formed in the flask. The injected resin is naturally cured, and a denture base is obtained.
JP 7-227400 A

  In a conventional dental flask placed in a denture base molding apparatus, the temporary denture is placed on the dough-like resin inlet side where the thin temporary base part on the back side, that is, the throat side is on the upper side of the flask. A temporary bed portion on the front tooth side, that is, the mouth side, is disposed on the lower side of the flask. In the flask, an injection tube containing a dough-like resin is placed on the injection port, the resin is pressurized downward, and injected through the injection port into a cavity in the gypsum mold. The resin flows into the cavity through a bifurcated spool in the gypsum mold where it flows from the upper thin cavity to the lower thick cavity.

  According to the inventor's analysis, the dough-like resin injected into the dental flask has a tendency to quickly dissipate and harden quickly in a thin or narrow cavity near the resin inlet in the gypsum mold (mold), There is a tendency for heat to slowly dissipate and harden later in the lower thick or wide cavity.

Summary of the Invention According to a feature of the present invention, a flask for manufacturing a resin denture base consists of two machined flask halves. Each of the two flask halves is formed on a flat inner surface, one surface forming a common plane of the two flask halves, and a fitting recess into which the resin injection tube is fitted, and the inner surface Formed into a wide gypsum mold recess having a flat surface with a predetermined depth, and an injection opening formed on the inner surface thereof for communicating the fitting recess with the gypsum mold recess. And a hole. At least one of the two flask halves is formed on a surface opposite to the one surface where the fitting recess is located, and has a gypsum injection opening communicating with the gypsum mold recess. Yes. The edge of the gypsum mold recess on the flat inner surface of each of the two flask halves has three sides each corresponding substantially to a partial line of three sides of the triangle, And three arcuate corners connecting adjacent sides of each of the two sides. Two of the three sides are from the corner on the injection aperture side to the other two corners of the three corners on the opposite side. Inclined to spread. Accordingly, the concave portion for the plaster mold is arranged on the corner side on the injection hole side on the front tooth side portion of the denture base, and on the other two corner sides on the opposite surface side. , Having a shape suitable for placing the throat side portion of the denture base.

  In an embodiment, each of the two flask halves has its injection open in the area between and near the corner of the mating recess side of the gypsum mold recess and the mating recess. Other than the hole, the outer diameter is larger than that of the injection hole, and there is substantially no cavity extending from or near the gypsum mold recess to the one surface or the vicinity where the fitting recess is located. can do.

  In the embodiment, two of the three sides can be configured to form an angle of 55 degrees to 65 degrees with respect to the opposite surface.

  In an embodiment, in the central axis of the gypsum mold recess passing through the injection hole and the inner surface, from the position on the axis of the corner of the fitting recess side in the direction perpendicular to the axis. The distance to the position of the maximum width of the gypsum mold recess on the axis is greater than two thirds of the height of the gypsum mold recess in the axial direction, and in a plane including the inner surface The distance in the vertical direction from the central axis of the gypsum mold recess to the sides and corners of the gypsum mold recess is from the corner of the fitting recess to the gypsum mold recess. It can be configured to increase substantially monotonically as it approaches the maximum width position.

  According to still another aspect of the present invention, a dental flask for producing a resin denture base is composed of cut first and second flask halves. The first flask half includes an outer member having a recess inside and an inner member that can be fitted into the recess. The inner member of the first flask half has a first gypsum mold recess having a wide flat surface of a predetermined depth inside. The second flask half is paired with the first gypsum mold recess and has a second gypsum mold recess having a flat surface with a predetermined depth inside.

  According to another aspect of the present invention, a method of manufacturing a resin denture base using the above-described flask is provided on the front side of the wax denture base at the corner side of the injection hole side in the gypsum mold recess. And placing the throat side portion of the denture base in the other two corners of the gypsum mold recess in the space within the dental flask in the wax denture base The gypsum is placed from the opening for injecting the gypsum around the denture base and cured, and the wax denture base is melted and discharged to form a gypsum mold having a cavity, and a dough-like resin Place the injection tube containing the in the fitting recess, pressurize the dough-shaped resin in the injection tube, and inject the dough-shaped resin into the cavity in the gypsum mold through the injection hole And thereby the front tooth side of the wax denture base To be a allowed to flow into the doughy resin from a thick cavity portion corresponding to the thin cavity portion corresponding to the throat side portion of the wax denture to fill the cavity in the doughy resin.

  Embodiments of the present invention will be described with reference to the drawings. In the drawings, similar components are given the same reference numerals.

  According to the inventor's analysis, the dough-like resin injected into the dental flask has a tendency to quickly dissipate and harden quickly in a thin or narrow cavity near the resin inlet in the gypsum mold (mold), There is a tendency for heat to slowly dissipate and harden later in the lower thick or wide cavity. Accordingly, during the injection of the dough-like resin, the thin dough-like resin is first cured in the thin cavity portion near the injection port, so that the inflow of the dough-like resin flowing later into the cavity is prevented by the cured portion. In the lower thick cavity, a sufficient amount of dough-like resin tends to cool and harden without being filled with sufficient pressure. As a result, the completed resin denture base is distorted, and the accuracy of the dimensional shape of the resin denture base tends to be low. Therefore, there is a tendency that the compatibility between the completed denture base or the floor denture and the intraoral shape of the patient is lowered.

  Further, according to the inventor's analysis, the dough-like resin flows through the injection port through the two-branch spool in the gypsum and is filled, so it flows from the two branches to the center of the thin cavity portion and the center. There is a tendency to meet and form an interface in position. At the interface, the degree of fusion or polymerization of the two parts of the resin is low, the density of the material is slightly low, and if the denture base made thereby has been used for many years, the denture base will tear along the interface. Easy to break.

  Furthermore, the cavity shape in the flask has a wide upper horizontal cavity located near the dough-like resin inlet, and therefore the upper side wall of the flask is relatively thin, and conversely the lower horizontal cavity width. Is narrower and therefore the lower side wall of the flask is thicker. Therefore, according to the inventor's analysis, during injection of the dough-like resin into the flask, a strong pressure applied to the dough-like resin in the injection tube is applied to the upper wall of the thin flask, so that the upper wall becomes uneven. There is a tendency to distort. Therefore, it causes distortion in the gypsum part near the dough-like resin injection port, thereby causing distortion in the cavity shape in the gypsum mold, which also causes internal stress and distortion in the denture base, and complete dentures. The floor accuracy is reduced.

  In addition, the artificial tooth temporary denture base formed or remounted on the plaster model of the articulator is removed from the articulator, placed in a flask and buried in uncured plaster to harden the plaster. In order to confirm the occlusal state, it is often difficult to rearrange the resin-made denture base with artificial teeth on the plaster model of the articulator due to the shape error of the completed resin-made denture base. In addition, the rearrangement takes extra time.

  The inventor has recognized that it is necessary to manufacture a resin-made denture base with high accuracy and high durability.

  The objective of this invention is implement | achieving the flask which has an internal structure which can produce the resin-made denture base of a higher precision.

  Another object of the present invention is to realize a flask that can efficiently produce a resin denture base.

  According to the present invention, a resin-made denture base with higher accuracy can be produced by the internal shape arrangement of the flask.

  FIG. 1 shows a denture base molding procedure using the denture base molding machine 1 and the dental flask 900. FIG. 2 shows the air piping and the operating principle of the denture base molding machine 1.

  In FIG. 1, the denture base molding machine 1 generally includes a clamp unit 200, a dough-like resin (resin) pressurizing and injection unit 300, an air flow adjusting unit 400, and a switch control unit 500. The main parts of the components 300, 400 and 500 are housed in the housing 10.

  The dental flask 900 consists of two flask halves 91 and 92. The flask halves 91 and 92 of the flask 900 are generally plane-symmetric with respect to each other such that their respective flat inner surfaces (FIGS. 7, 911, 921) are in contact contact with each other, such as bolts passing through both through openings. They are fixed to each other by a fixture 930 such as a nut. The flask 900 is formed with a cavity by joining the two flask halves 91 and 92 together.

  When making a denture base, place the uncured gypsum and temporary denture in one of the recesses in the flask half 91 or 92 before bonding, and then place the flask halves 91 and 92 in contact with the inner surface. Then, mud gypsum is poured to surround the temporary denture in the cavity, and the entire gypsum is cured. The separation surface of the gypsum is treated so that the gypsum can be divided into a gypsum mold half 940 on the flask half 91 side and a gypsum mold half on the flask half 92 side after curing. In the temporary denture made of wax, the flask halves 92 and 92 are temporarily separated, heated, melted, and discharged. As will be described in detail later, a dough-shaped resin is injected under pressure by the denture base molding machine 1 to mold the denture base, as will be described in detail later, in the cavity or gap formed by melting and discharging the temporary denture.

  In FIG. 2, the cylinder 320 is shown in cross section. In the denture base molding machine 1, pressurized air or compressed air or air or inert gas from an external compressor or gas cylinder is supplied to the pressure adjusting unit 400 via the air supply pipe 600, and further, the air flow adjusting unit 400 is supplied to the resin pressure injection unit 300. The air supply pipe 600 is branched to the air supply pipe 700 at a position after the valve 412, and the gas is also supplied to the clamp unit 200 through the air supply pipe 700.

The pressurized or compressed gas from the air supply pipe 600 passes through the filter regulator 410, and the flow path is determined in the valve 420 and may be diverted. The one flow path is a flow path from the valve 420 to the upper chamber S _{1 of the} cylinder 320 through the upper air flow opening 322. As another flow path is a flow path through the through lower air flow opening 324 of the valve 430 from the valve 420 to the chamber _{S 2} of the cylinder 320. Depending on the flow path that has been set in the valve 420, the pressurized air in the upper chamber S ₁ and / or the lower chamber S _2, can be discharged to the outside air in the valve 420.

  Air from the air supply pipe 700 is supplied to the air cylinder 210, and the flask fixing plate 222 is pressed by the piston rod 220, and the flask fixing plate 222 presses and fixes both sides of the flask 900.

  The clamp unit 200 includes two cylindrical left and right air cylinders 210, pistons and rods 220 attached to the air cylinder 210 and capable of horizontal reciprocation, and two flask fixing plates 222 that are in contact with both side surfaces of the flask 900. It has. The clamp unit 200 fixes the flask 900 by clamping both sides of the flask 900 opposite to each other with pressurized air as shown in the figure. The operation of the clamp unit 200 is controlled by the switch control unit 500.

The resin pressure injection part 300 is located on the clamp part 200 and is located directly above the resin injection pipe 100 disposed on the upper surface of the flask 900. The pressure rod 310 injects the dough-like resin accommodated in the resin injection tube 100 into the flask 900 at a required pressure while descending. The piston 312 has a cylindrical shape having an outer diameter corresponding to the inner diameter of the resin injection tube 100 and a thickness smaller than the outer diameter. The piston 312 and the pressure rod 310, depending on the air amount and the pressure supplied through the upper and lower air flow apertures 322 and 324 in the upper chamber S ₁ and / or lower chamber S ₂ is discharged from the chamber, Lower or rise at the corresponding speed. The piston 312 and the pressure rod 100, the air pressure is lowered when the air pressure is greater than in the lower chamber S ₂ in the upper chamber S _1, the air pressure is less than the air pressure in the upper chamber S ₁ is in the lower chamber S ₂ Rise in case.

The air flow adjusting unit 400 includes a filter and regulator means 410, an air amount adjusting / flow path switching valve 420, and a descending speed adjusting valve 430 partially exposed to the outside of the housing 10, and further includes a gas pressure. It has a total of 416. The air flow adjustment unit 400 is connected to the resin pressurization injection unit 300 through a conduit, and supplies air to the resin pressurization injection unit 300 and / or exhausts air from the resin pressurization injection unit 300. Adjust the pressure in chambers S ₁ and S ₂ .

  The filter / regulator 410 includes a valve 412 and a filter 414. The valve 412 adjusts the pressure of air supplied from the air supply pipe 600. The pressure gauge 416 has an indicator on the outer surface of the housing 10 and displays the pressure of air supplied from the air supply pipe 600. In this case, the valve 412 is an electromagnetic valve that is electrically operated by a solenoid. As an alternative configuration, the valve 412 may be a manual open / close valve. The filter 414 is detachably coupled to the lower side of the valve 412, separates moisture in the pressurized gas supplied from the outside, and only the gas is supplied to the resin pressurizing injection unit 300.

  A valve 420 is coupled via a conduit between the filter / regulator 410 and the upper lower air flow openings 322 and 324 to regulate the amount of air supplied from the filter / regulator 410 and to remove the conditioned air. The air is distributed to the air flow openings 322 and 324 on the upper and lower sides of the cylinder 320, respectively. The valve 420 is similarly opened and closed by a solenoid to adjust the opening degree of the flow path. As an alternative configuration, a composite open / close valve (a combination of a plurality of valves) may be used as the valve 420, which may be manually operated. The valve 420 further has a discharge port or opening for discharging air from the air circulation openings 322 and / or 324 to the outside air. In the valve 420, the air flow path from the air supply pipe 600 is closed and the discharge port is opened, so that air can be discharged from the air circulation openings 322 and / or 324 into the outside air.

The valve 430 is connected between the outlet of the valve 420 and the lower air circulation opening 324 and adjusts the descending speed of the piston 312 in the cylinder 320. When the lower chamber S ₂ is completely in communication with the outside air, when the pressurized air suddenly flows into the upper chamber S ₁ from the valve 420 through the upper air circulation opening 322, the pressure rod 310 descends at a high speed. . However, while pressurized air is supplied to the upper chamber S ₁ from the valve 420 in a state where the lower chamber S ₂ pressurized air is filled, by adjusting the distribution of or opening degree of the flow path of the valve 430 to form a flow path from the lower chamber S ₂ to the outside air by opening the valve 430, depending on the distribution of or opening degree of the flow path of the valve 430, it is gradually discharged pressurized air from the lower chamber S _2, The lowering speed of the pressure rod 310 can be lowered by the cushioning (elastic) effect or the damping effect of the air in the upper and lower chambers S ₁ and S ₂ .

The resin pressurizing injection unit 300 is accommodated in the cylinder 320 and can be vertically reciprocated in a state where the inner surface and the peripheral surface of the cylinder 320 are in contact with each other, a pressurizing rod 310 connected to the piston 312, and a piston An upper variable chamber (room, space) S ₁ and a lower variable chamber S ₂ that are divided up and down by 312 and upper and lower portions of the left side surface of the cylinder 320 corresponding to the chambers S ₁ and S ₂ , respectively. The upper air circulation opening 322 and the lower air circulation opening 324 are formed. The upper variable chamber S ₁ is mainly for applying a downward force to the pressure rod 310. Variable chamber S ₂ of the upper is for primarily low lowering speed of the pressure rod 310 by the cushion effect of the internal air.

  The switch controller 500 includes a power switch 510, a flow path setting and air amount adjustment switch 530 for the valve 420, and a continuous or multi-state variable opening degree changeover switch 540 for adjusting the descending speed for the valve 430. It is out. The switch control unit 500 is electrically connected to the electromagnetic valves of the clamp unit 200 and the air flow adjustment unit 400, and controls the drive of the clamp unit 200, the elevation speed of the resin pressurization injection unit 300, and the air pressure of the air flow adjustment unit 400. Control. As an alternative configuration, the changeover switches 530 and 540 may be non-electrically manual. The valve 430 may be a valve whose opening degree can be adjusted manually.

  The power supply from the external power source to the switches 530 and 540 is controlled by the on / off operation of the power switch 510. When the power switch 510 is turned on, the clamp unit 200 is driven to fix both side surfaces of the flask 900, and when the power switch 510 is turned off, the flask 900 is released from the fixed state.

In the initial state, the piston 312 takes the uppermost position in the cylinder 320, the volume of the upper chamber S ₁ is the smallest, the volume of the lower chamber S ₂ is the largest. Therefore, the pressure rod 310 is also at the highest position. The flow path of the valve 420 and the opening degree thereof can be controlled, and the flow path and supply amount of air to the upper and / or lower air circulation openings 322 and 324 can be controlled.

In the initial state, pressurized air is filled in the lower chamber S _2, the upper chamber S ₁ is in communication with the outside air. Then, the switch 530 is manually operated to control the valve 420 which is electrically connected to the switch 530, thereby closing the flow path from the upper chamber S ₁ to the outside air, the flow from the valve 412 to the lower chamber S ₂ close the road, open the flow path from the lower chamber S ₂ to the outside air, to open the flow path from the valve 412 to the upper chamber S _1, supplies pressurized air to the upper chamber S _1. Thereby, it is possible to be discharged air from the lower chamber S ₂ to the outside air, it applied sufficient downward pressure to the pressure rod 310, to lower the cylinder 320 and a pressure rod 310. On the other hand, by the switch 540 is manually operated to adjust the electrical connection flow paths opening degree of the valve 430 to switch 540, adjusts the outflow velocity of the pressurized air from the lower chamber S ₂ to the outside air And thereby can be adjusted to lower the lowering speed of the pressure rod 310. Thus, without adjusting the flow rate of the pressurized air into the upper chamber S _1, by adjusting the air exit velocity from the lower chamber S ₂ to the outside air, controlling the downward movement of the pressing rod 310 This makes it easier to press and stabilizes the pressure operation.

By larger adjusting the opening degree of the flow path from the lower chamber S ₂ by adjusting the opening degree of the flow path of the valve 430 to the ambient air by the switch 540, to be faster lowering speed of the pressure rod 310 it can. In order to increase the descending speed, the flow rate of the pressurized air from the valve 420 to the air circulation opening 322 may be further increased by adjusting the opening degree of the flow path of the valve 420 by the switch 530.

After the piston 312 and the pressure rod 310 is lowered by the upper chamber S ₁ is opened to the outside air and discharges the pressurized air to the outside air, pressurized air is supplied to the lower chamber S _2, the piston 312 Move up to return to the initial state.

  In this way, the opening degree of the valve 430 is variably adjusted by the switch 540, thereby giving an appropriate injection pressure and injection speed to the piston 312 and the pressure rod 310 according to various characteristics of the resin having different viscosities. Can do. Further, by using gas as the piston working medium, it is possible to prevent the dough-shaped resin being filled from being distorted or excessively caused by the cushioning action of the gas. Thereby, the shape accuracy and stability of the completed resin denture base can be increased.

  FIG. 3A shows another example of piping between manual valves 420 and 430 and cylinder 320. In the valve 420, the communication relationship or flow path among the air supply pipe 600, the upper air circulation opening 322, the valve 430, and the discharge port 422 is switched depending on the setting position of the manual switch 530. The manual switch 530 may be a plurality of valve changers. The valve 430 appropriately communicates between the valve 420 and the lower air circulation opening 324 according to the flow degree or opening degree of the flow path, and the opening degree is manually set to 0% to 100% by a rotating wheel (handle). Adjusted.

FIG. 3B shows an example of the arrangement and configuration of valves 420 and 430. Valve 420, pressurized gas inlet 423 pressurized gas is supplied in communication with the valve 412, the opening 424 communicating with the upper air flow opening 322 of the variable chamber _{S 1,} opening 425 communicates with the valves 430 and, An external opening 422 communicating with the outside air is provided. A valve 420 a is disposed between the openings 412 and 424. A valve 420b is disposed between the openings 412 and 425. A valve 420c is disposed between the openings 424 and 422. A valve 420d is disposed between the openings 425 and 422. Valve 430 has an opening 434 communicating with the lower air flow opening 324 of the opening 432, and the variable chamber _{S 2} communicates with the opening 425 of the valve 420, flow of the flow path between the opening 432 and the opening 434 or The degree of opening can be adjusted.

  Next, the usage of the denture base molding machine 1 will be described. The user places a thin circular aluminum plate or sheet on the bottom surface of the resin injection tube 100 and places the resin injection tube 100 in the melting furnace 800, and accommodates the powder resin in the resin injection tube 100. Next, the user turns on the power of the melting furnace 800, melts the resin in the resin injection tube 100, and closes the bottom surface of the resin injection tube 100 with an aluminum plate in the recess on the upper surface of the flask 900. The flask 900 is placed between the two fixing plates 222 of the clamp part 200 and the power switch 510 is turned on. At that time, the range injection tube 100 disposed on the flask 900 is disposed in alignment with the lower end surface of the pressure rod 310. Next, the user operates an air compressor (not shown) connected to the air flow adjusting unit 400 and the clamp unit 200 through the air supply pipes 600 and 700 to supply pressurized air.

  Next, the fixing plate 222 of the clamp unit 200 contacts the both sides of the flask 900 by the air flowing in through the air supply pipe 700 and fixes the flask 900. The user adjusts the opening degree of the valves 420 and 430 (particularly the valve 430) with the switches 530 and 540 while confirming the pressure of the pressurized air with the pressure gauge 416, and pressurizes the pressure rod of the resin pressure injection unit 300. 310 is lowered.

  The pressure rod 310 causes the dough-like resin R accommodated in the resin injection tube 100 to flow into the cavity in the gypsum in the flask 900 through the opening on the upper surface of the flask 900 while descending at a constant speed and at a constant pressure. Fill. The dough-like resin flows through the thin aluminum plate disposed on the bottom surface of the resin injection tube 100. After the resin in the cavity has hardened, the user removes the fixture 930 to release the coupling of the flask halves 91 and 92 and separates the molded denture base from the flask 900, thereby removing the denture base. Molding is complete.

  Table 1 shows an example of the optimal relationship between denture base material type, piston pressure, valve opening, piston descent time or speed at a given distance (eg, 13 cm).

  When the denture base molding machine 1 is used, the lowering pressure and lowering speed of the piston 310 are controlled by variably controlling the valves 412, 530 and 430, especially the valve 430, depending on the type of denture base material. Can be adjusted to optimum conditions.

  4A and 4B show the internal shape of the patient's maxillary flask half 91 'and the opposite lingual flask half 92' of a conventional flask 900 '. The flask halves 91 'and 92' are each made by casting as a casting, so the outer, inner and inner wall surfaces of the flask halves 91 'and 92' are not smooth and rough.

  Flask halves 91 'and 92' of flask 900 'have an opening 902' for mud gypsum injection, a recess 904 'into which the bottom of resin injection tube 100 is fitted, an opening 906' for dough-like resin injection, There are apertures 908 'for venting and discharging liquid and four through apertures 932' for securing the flask halves 91 'and 92'. The flask half 91 ′ has a gypsum mold recess 912 ′ having a large predetermined depth for accommodating gypsum on the inner surface on the fitting side. The flask half 92 ′ has a gypsum mold recess 922 ′ having a large predetermined depth for accommodating the gypsum mold on the inner surface on the fitting side. A tongue-like hill-shaped portion is formed on the inner surface of the gypsum mold recess 922 '. The two fitting recesses 934 'of the flask half 91' are fitted with the fitting protrusions 935 'of the flask half 92'. The inner surfaces of the flask halves 91 ′ and 92 ′ face each other to form a hollow space for accommodating the entire gypsum.

  The gypsum mold recesses 912 ′ and 922 ′ are formed so that the upper side in the vicinity of the recess 904 ′ is wide left and right (the length of the horizontal broken arrow), and the lower side on the opposite side of the recess 904 ′ is It is formed narrower (the length of the horizontal dashed arrow). Accordingly, a thin portion of the resin denture base on the throat side or back teeth (jaw between the left and right rows of back teeth) side in the mouth is disposed in the recess 904 ′ side, and the mouth side of the resin denture base in the mouth Alternatively, the thick portion on the front tooth side is disposed on the side opposite to the recess 904 ′.

  5 and 6 show how the dough-like resin R is injected into the cavity or gap 980 'in the gypsum mold half 940' in the flask 900 'fixed from the resin injection tube 100 in the denture base molding machine 1. ing. Here, FIG. 5 shows the state in the flask 900 ′ in a form in which the flask half 92 ′ is removed and the inner surface of the flask half 91 ′ is viewed. FIG. 6 shows the state in the flask 900 ′ as a cross-sectional view of the flask 900 ′ taken along section VI-VI perpendicular to the inner surface of the flask half 91 ′. 5 and 6, the flow of the dough-like resin R is indicated by arrows.

  In the conventional flask 900 ′, the dough-shaped resin R is divided from the resin injection tube 100 to the left and right through two branch channels (spools) formed in the cured gypsum mold halves 940 ′ and 950 ′. It flows downward through the thin gap above the inner cavity 980 'and reaches the thick gap below the cavity 980' in the gypsum. The upper thin narrow gap corresponds to a thin portion on the throat side or back teeth (jaw between the left and right rows of back teeth) in the oral cavity of the resin denture base 981 '. The thick lower gap on the lower side corresponds to the thick part on the mouth side or the front tooth side in the oral cavity of the resin-made denture base 981 '.

  The inventor has a tendency for the dough-like resin R to quickly dissipate and harden quickly in a thin cavity near the dough-like resin injection apertures 906 'in the gypsum mold halves 940' and 950 ', and the lower thick It has been discovered that there is a tendency to slowly dissipate heat in the cavity and later cure. Therefore, during the dough-like resin injection period, the dough-like resin R is first cured in the thin cavity portion near the injection hole 906 ′, so that the cavity of the dough-like resin R injected later by the cured resin. Inflow is blocked, and in the lower thick cavity, a sufficient amount of dough-like resin does not fill with sufficient pressure and tends to harden over time. As a result, due to insufficient quantity of resin and insufficient pressurization in the lower thick cavity, distortion and excessive internal stress are produced in the molded denture base, the surface condition is disturbed and roughened, and the accuracy of the denture base is low. Become. Therefore, the compatibility between the completed denture base and the intraoral shape of the patient is lowered.

  In addition, the dough-like resin that flows in and fills through the two right and left branch channels in the gypsum mold half 940 ′ meets the center position of the thin hollow portion to form an interface as shown by the broken line, At the interface, the degree of fusion, polymerization or entanglement of the left and right parts of the resin is low, the density of the material is somewhat low, and if a denture made thereby is used for many years, it will break easily at the interface position Become.

  Further, the size and shape of the cavity 980 ′ in the flask 900 ′ is wide in the upper horizontal (left and right) cavity located near the dough-like resin injection hole 906 ′, and thus is represented by a vertical double-headed solid arrow. As shown, the upper wall of the flask 900 'is thin and the lower cavity width is narrower, and thus the flask cavity under the cavity is thicker. Therefore, since the pressure F applied to the dough-like resin R in the cylinder container is concentrated on the upper upper side wall of the thin flask during the period in which the dough-like resin R is injected into the flask 900 ′, the two openings A strong pressure F is applied to the flask wall portion in the vicinity of the dough-like resin injection hole 906 ′ on the upper flask wall between 902 ′, and the upper wall of the flask is distorted unevenly. Therefore, it causes distortion in the gypsum part near the dough-like resin injection hole 906 ′, thereby distorting the size and shape of the cavity 980 ′, which also causes internal stress and distortion in the resin denture base. The accuracy of the denture base is lowered.

  FIGS. 7A and 7B show a flask 900 according to an embodiment of the invention showing the internal shape of the patient's maxillary or mandibular side flask half 91 and the internal shape of the opposite lingual flask half 92. It is a side view of the half parts 91 and 92. FIG. FIG. 8 shows a perspective view of the two flask halves 91 and 92 separated from each other. The flask halves 91 and 92 are machined by cutting or cutting a rectangular parallelepiped metal (for example, stainless steel) block (bulk) using a machine tool and a tool. The surface of the inner wall is smooth and the accuracy of the dimensions is very high.

  The flask halves 91 and 92 of the flask 900 have two openings 902 for pouring gypsum, two flask halves 91 and 92, which are spaced apart from each other on the side of the common lower surface 901 spanning the two flask halves 91 and 92. 92, a circular or cylindrical fitting recess 904 (each semicircular shape) is fitted into the common upper side 903 side across the inner side 903, and the inner sides 911, 921 of the flask halves 91 and 92 The dough-shaped resin injection hole 906 formed and four through-holes 932 for fixing the flask halves 91 and 92 are provided. The interval between the upper two through holes 932 is narrower than the interval between the lower two through holes 932.

  A wide gypsum mold recess 912 is formed in the inner surface 911 on the joining side of the flask half 91, and the recess 912 forms a space for accommodating the gypsum mold and has a predetermined depth (e.g., 21 mm) with a wide flat surface 913. A wide gypsum mold recess 922 is formed on the fitting inner surface 921 of the flask half 92, and the recess 922 forms a space for accommodating the gypsum mold and has a predetermined depth (for example, 21 mm) has a wide flat surface 923. The gypsum mold recesses 912 and 922 communicate with the recess 904 through the opening 906 at the upper corner Ct of the peripheral side surfaces 914 and 924, and communicate with the two openings 902 at the lower two corners Cb1 and Cb2. To do.

  The edges 915 and 925 of the gypsum mold recesses 912 and 922 on the flat inner surfaces 911 and 921 have three side edges S1 substantially corresponding to partial lines at the center of the three sides of the isosceles triangle, respectively. , S2, Sb, and three corners in an arc shape (arch shape) that are located between two adjacent sides of each of the three sides and connect the two adjacent sides of the three sides. Parts Ct, Cb1, and Cb2. Also, the wide flat surfaces 913 and 923 at the bottom of each of the gypsum mold recesses 912 and 922 are smooth and flat, and in the same way, in the partial line segment at the center of the three sides of the isosceles triangle. Three adjacent sides S1, S2, and Sb that substantially correspond to each of the two adjacent sides of each of the three sides and two adjacent sides of each of the three sides Arc-shaped corners Ct, Cb1, and Cb2 connecting the two. In other words, the space formed by the two gypsum mold recesses 912 and 922 has a generally triangular rice ball shape, and the flat surfaces 913 and 923 are roughly rounded at the three vertices or the three tops. Triangular contour edges 915 and 925 are provided. Two of the three sides, S1 and S2, are directed from the corner Ct on the resin injection aperture 906 side to the other two corners Cb1 and Cb2 on the opposite side of the opening 902 side. It is inclined to spread. The inclination angle θ of the two sides S1 and S2 is preferably an angle within a range of 55 degrees to 65 degrees (eg, 60 degrees). The peripheral side surfaces 914 and 924 of the gypsum mold recesses 912 and 922 are slightly inclined so as to spread from the bottom bottom surfaces 913 and 923 toward the joining inner surfaces 911 and 921, and are perpendicular to the inner surfaces 911 and 921. About 5 to 9 degrees (eg, an inclination angle of 7 degrees). Accordingly, in the side views of FIGS. 7A and 7B, the inclined peripheral side surfaces 914 and 924 can be seen from the inner surfaces 911 and 921 side.

  The two mating recesses 934 of the flask half 91 are mated with the two mating projections 935 of the flask half 92, thereby the two plaster mold recesses 912, 922 of the flask halves 91 and 92. Are accurately aligned. The inner surfaces 911, 921 of the flask halves 91 and 92 face each other to form a large cavity space for accommodating the entire gypsum mold inside the flask 900 by the two gypsum mold recesses 912 and 922. . The flask halves 91 and 92 have substantially the same size and shape except that the two fitting recesses 934 and the fitting protrusions 935 are different.

  The gypsum mold recesses 912 and 922 are formed such that the width in the horizontal direction H on the circular recess 904 side is narrowed to the left and right, and the width in the horizontal direction H opposite to the recess 904 is wide in the left and right sides. . Accordingly, in the gypsum mold recesses 912 and 922, the thick part of the mouth side or the front tooth side in the oral cavity of the resin denture base 981 is disposed on the recess 904 side, and the throat side or the back teeth in the oral cavity of the denture base 981 The thin part on the side (the jaw between the left and right rows of back teeth) has a shape suitable for being arranged on the side opposite to the recess 904.

  FIG. 9 shows the dimensions of each of the flask halves 91 and 92. 9, each flask half 91, 92 has a height Lv = 90-110 mm (eg, 100 mm), a lateral width Lh = 95-115 mm (eg, 105 mm), and a thickness Ld = 30-40 mm (eg, 35 mm). (FIG. 11). Accordingly, the flask 900 has an outer shape with dimensions of height Lv = 90 to 110 mm (eg, 100 mm), lateral width Lh = 95 to 115 mm (eg, 105 mm), and thickness 2Ld = 60 to 80 mm (eg, 70 mm). The gypsum mold recesses 912 and 922 in each of the flask halves 91 and 92 have a depth Md = 19 to 23 mm (eg, 21 mm) (FIG. 11), a height Mv = 67 to 83 mm (eg, 75 mm), and a width. Mh = 90-110 mm (eg, 100 mm). Accordingly, a hollow space having a height Lv = 90 to 110 mm (eg, 100 mm), a lateral width Lh = 95 to 115 mm (eg, 105 mm), and a thickness 2Ld = 60 to 80 mm (eg, 70 mm) inside the flask 900. Is formed.

  The circular recess 904 on the upper surface 903 of the flask 900 has dimensions of a diameter (inner diameter) Rd = 30 to 38 mm (eg, 34 mm) and a depth Rh = 4 to 6 mm (eg, 5 mm). The resin injection hole 906 of the flask 900 has dimensions of a diameter (inner diameter) Pd = 8 to 12 mm (eg, 10 mm) and a length Ph = 8 to 12 mm (eg, 10 mm). The opening 902 for injecting gypsum of the flask 900 has a diameter Ad = 8 to 17 mm (eg, one (corner Cb1 side) is 10 mm, the other (corner Cb2 side) is 15 mm), and a length of 10 to 15 mm (eg, 13 mm).

  The curved surfaces (914, 924) of the corners Ct on the side of the top recess 904 in the gypsum mold recesses 912, 922 are on the surfaces (cross sections) parallel to the inner surfaces 911, 921 of the flask halves 91, 92. Is generally arcuate or arched. The curved surfaces of the wall surfaces (914, 924) at the other two corners Cb1, Cb2 at the bottom of the recesses 912, 922 are also generally arc-shaped or arched on each surface (cross section) parallel to the inner surfaces 911, 921. is there. Two sides S1 and S2 on each plane parallel to the inner surfaces 911 and 921 in the peripheral side surfaces 914 and 924 of the recesses 912 and 922 have an inclination angle θ = 55 to 65 degrees (eg, 60 degrees).

  The entire gypsum mold recesses 912 and 922 are under the resin injection opening 906, that is, the peripheral side surfaces of the recesses 912 and 922 do not exist above the height of the lower end of the opening 906. In the area between the arcuate curved surface of the corner Ct (wall surface) on the side of the recess 904 of the gypsum mold recesses 912 and 922 and the recess 904 and in the vicinity thereof, there are recesses other than the resin injection hole 906. It is preferred that there is substantially no cavity to reach the upper side 903 and / or vicinity of flask 900 from locations 912, 922 and / or its vicinity, and in particular, such as having an outer diameter larger than resin injection aperture 906. It is preferred that substantially no cavities exist.

  In FIG. 9, the horizontal direction H is parallel to the intersection line of the lower surface 901 and the inner surfaces 911 and 921 of the flask 900 on the opening 902 side. The central axis Cv of the recesses 912 and 922 perpendicular to the lower surface 901 and the horizontal direction H passes through the central axis of the resin injection hole 906 and the plane including the inner surfaces 911 and 921. On the vertical central axis Cv, the distance Th from the position of the corner Ct to the position x of the maximum width Mh in the horizontal direction H of the recesses 912 and 922 is half of the height Mv of the recesses 912 and 922. Greater than, preferably greater than 2/3 (eg, 3/4). In the plane including the inner surfaces 911 and 921, in the range of the distance Th on the central axis Cv, from the central axis Cv of the gypsum mold recesses 912 and 922, the sides S 1 and S 2 of the recesses 912 and 922 and the corners Ct, The distance D (in the horizontal direction H) to Cb1 and Cb2 increases substantially monotonously as it approaches the position X of the maximum width Mh in the horizontal direction H from the corner Ct on the recess 904 side.

  10 and 11 show how the dough-like resin R is injected into the cavity or gap 980 in the gypsum mold half 940 in the flask 900 fixed from the resin injection tube 100 in the denture base molding machine 1. Here, FIG. 10 shows the state in the flask 900 in a form in which the flask half 92 is removed and the inner surface 911 of the flask half 91 is viewed. FIG. 11 shows a state in the flask 900 as a cross-sectional view of the flask 900 in a state cut along a cross section XI-XI perpendicular to the inner surface 911 of the flask half 91. 10 and 11, the flow of the dough-shaped resin R is indicated by arrows.

  In a flask 900 according to an embodiment of the present invention, the dough-like resin R is fed from a resin injection tube 100 through a resin injection aperture 906 and into a single central gypsum mold 940 and 950 that is coaxial therewith. It flows through the channel 907, flows downward through the thick gap above the cavity 980 in the gypsum, and reaches the thin gap below the cavity 980 in the gypsum. The thick wide gap on the upper side corresponds to the thick part on the mouth side or the front tooth side in the oral cavity of the resin denture base 981. The thick wide gap on the lower side corresponds to a thin portion on the throat side or back teeth (jaw between the left and right rows of back teeth) in the oral cavity of the resin denture base 981.

  The dough-like resin R cures quickly by quickly dissipating heat in the thin hollow part (on the opposite side of the dough-like resin injection hole 906) in the gypsum mold halves 940 and 950, and the dough-like resin injection hole There is a tendency for heat to slowly dissipate and harden later in the upper thick cavity near 906. Therefore, before the dough-like resin R is first cured in the lower thin cavity portion, the dough-like resin R flows into the lower thin cavity portion with a sufficient amount and sufficient pressure, and the lower thin cavity portion. The portion is cured in a state where a sufficient amount of dough-like resin R is filled in a sufficient amount in a short time and is sufficiently pressurized. Also, the dough-like resin R injected later in the upper thick cavity is filled with a sufficient amount and sufficient pressure, and is cured later. Thereby, distortion and excessive internal stress are not easily generated in the molded denture base, and the surface of the denture base is not disturbed and roughened, and the accuracy of the denture base is increased. Therefore, the compatibility between the completed denture base and the intraoral shape of the patient is enhanced.

  In addition, the dough-like resin R that has flowed in and filled through the central flow path 907 in the gypsum mold (940 and 950) flows smoothly and relatively quickly to the lower side of the cavity 980, and from the lower side of the cavity of the gypsum mold. It is packed densely in an upward direction, and an interface is not formed in the center of the denture base as in the prior art, and the thin portion does not easily break.

  Further, the size and shape of the cavity 980 inside the flask 900 is such that the upper horizontal (left and right) cavity width located near the dough-like resin injection aperture 906 is narrower, and therefore as indicated by the double-headed arrow. The upper side wall of the flask is thick. Also, the lower horizontal cavity width is wider, and therefore the lower left and right flask sidewalls are narrower. Accordingly, during the period in which the dough-shaped resin R is being injected into the flask 900, the pressure F is applied to the dough-shaped resin R in the resin injection tube 100, thereby strongly resisting the portion of the flask wall near the resin injection opening 906. Even when the pressure F is applied, the flask upper side wall of the flask 900 is not distorted in an undesired manner. Accordingly, the plaster portion located near the resin injection hole 906 is not distorted, and the molded resin denture base is not distorted, thereby improving the accuracy of the denture base.

  FIG. 16 shows a schematic configuration of an example of a normal articulator 800. The articulator 800 fixes a brace 802, an upper arch 805 rotatably attached to the brace 802 via a hinge 804, an incisor pin 808 attached to the maxillary arch 805, and a conventional attachment member 810 to the maxillary arch 805. It comprises an occlusal flat plate 820 supported by a fixing screw 806 having an external thread and a base 821 on a mandibular arch 807. The maxillary arch 805 has a fitting protrusion 824 that fits into the recess of the mounting member 810. The mounting member 810 has an annular permanent magnet fixed to the bottom surface thereof, and fixes an iron fitting 812 for fixing gypsum with a magnetic force.

  FIG. 17A shows a state where a normal attachment member 810 is attached to the articulator 800 using a gypsum model 941 attached with an occlusal floor 978 in order to create a temporary denture 981. FIG. 17B shows a state in which the attachment member 810 to which the plaster model 941 on which the wax temporary denture 981 with artificial teeth is arranged is attached is fixed to the articulator 800.

  Referring to FIG. 17A, in order to create a temporary denture 981, a plaster portion in which a metal fitting 812 is embedded in an upper part of an upper jaw plaster model 941 with an occlusal floor 978 is formed. Next, the metal fitting 812 of the plaster model 941 is fixed to the permanent magnet of the attachment member 810, the occlusal floor 978 is placed on the occlusal plane plate 820, and the attachment member 810 to which the plaster model 941 is fixed is attached to the upper jaw 805 of the articulator 800. It is fixed with a fixing screw 806. Next, as shown in FIG. 17B, artificial teeth are arranged on the wax in accordance with the shape of the occlusal floor 978 to produce an upper wax temporary denture 981 (FIG. 17B) (not shown). . The lower jaw plaster model with an occlusal floor is also attached to the lower part of the articulator, and artificial teeth are arranged in the same manner to produce a lower wax temporary denture. Thereafter, the upper temporary denture 981 is separated from the plaster model 941. Similarly, the lower temporary denture is also separated from the plaster model.

  The separated upper denture 981 is placed in a flask and a wax spool is added and embedded in uncured gypsum. Similarly, the lower temporary denture is also embedded in another flask, and a denture base made of resin is produced using a denture base molding machine.

  In order to confirm the suitability of the completed denture base 981, it is troublesome to fix the denture base 981 again on the plaster model 941 of FIG. 18B, and an error is likely to occur in the arrangement.

  The inventor does not need to fix the temporary denture in the half of the flask if the gypsum model is fixed to the recess of the inner member that forms part of the flask instead of fixing the gypsum model to the normal mounting member. Therefore, it was recognized that the plaster model can be used as it is as a part of the gypsum mold half, and the accuracy of the shape of the gypsum mold half can be increased. The inventor can easily confirm the occlusal compatibility of the completed denture base with high accuracy by setting the inner member to which the completed denture base is fixed on the plaster model to the articulator. I recognized.

  FIGS. 12A and 12B show a variation of the flask 900 of FIGS. 7A, 7B and 8, with the internal shape of the flask half 93 of the patient's upper or lower jaw side of the flask 900b according to another embodiment of the present invention. FIG. 9 is a side view of the flask halves 93 and 92, showing the internal shape of the flask half 92 on the opposite lingual side. In this case, the flask half 93 is a variation of the flask half 91 of FIG. 7A. The flask half 92 of FIG. 12B is similar to that of FIG. 7B.

  In FIG. 12A, the flask half 93 is separated into an inner member 917 having the same gypsum mold recess 912 as that of the flask half 91 of FIG. 7A and an outer member 910 into which the inner member 917 is fitted and received. ing. The outer member 910 and the inner member 917 are also formed by cutting. The inner member 917 has a predetermined thickness with respect to the inner surface, and preferably has a thickness of 5 mm to 8 mm, for example, 6 mm. When the inner member 917 is fitted into the recess of the outer member 910, the outer surface of the inner member 917 substantially adheres to the inner surface of the recess of the outer member 910, thereby providing good thermal coupling for heat dissipation of the high temperature molten resin. And the flask half 93 can be handled in the same manner as the flask half 91 of FIG. 7A. However, the opening 902 for pouring mud gypsum is formed only in the flask half 91 and not in the flask half 93. Only two openings 902 in the flask half 91 alone are sufficient for pouring mud gypsum. Inner member 917 is adapted to be separated from outer member 910 and attached to the articulator.

  13A is a side view of the outer member 910 showing the inner shape of the outer member 910 of the flask half 93. FIG. 13B is a cross-sectional view of outer member 910 along line XIIIB-XIIIB in FIG. 13A.

  The outer member 910 has a main bottom surface 943 at a position deeper than the bottom surface 913 of the gypsum mold recess 912 of the inner member 917, for example, 6 mm deep, and its peripheral side surface 944 has a gypsum mold recess. It is located outside a predetermined distance, for example, 6 mm, from the peripheral side surface 914 of 912. Similar to the peripheral side surface 914, the peripheral side surface 944 is slightly inclined so as to spread from the bottom surface 943 toward the bonding inner surface 911, and is about 5 to 9 degrees relative to the direction perpendicular to the inner surface 911 (eg, inclined) (Angle 7 degrees) A disc-shaped recess 946 is formed at the center of the bottom surface 943 of the outer member 910. The bottom surface of the recess 946 is at a position deeper than the bottom surface 943 by a predetermined distance, and preferably at a position deeper by 2 mm to 4 mm, for example, 3 mm.

  14A, 14B, 14C, and 14D respectively show a side view, a right side view, a top view, and a rear view as seen from the inner surface side of the inner member 917 of the flask half 93.

  The inner member 917 has a wall thickness of a predetermined thickness from the inner bottom surface 913 and the inner peripheral side surface 914, for example, 6 mm. The inner member 917 has a flat outer main back surface 919, and the outer peripheral side surface 918 is slightly inclined so as to spread from the flat outer back surface 919 toward the joining inner surface 941, and with respect to a direction perpendicular to the inner surface 941. It is inclined by about 5 to 9 degrees (eg, an inclination angle of 7 degrees).

  The inner member 917 has, in the center of the back surface 919, a mounting portion 947 having a predetermined flat height, preferably 2 mm to 4 mm, for example, 3 mm, in the form of a hill having a substantially flat columnar shape. However, the attachment portion 947 may not protrude from the back surface 919, and the height of the back surface 949 of the attachment portion 947 may be the same height as the back surface 919. The inner member 917 is formed with a female screw recess 962 having a predetermined depth to be attached to the male screw for fixing the articulator at the approximate center of the circular attachment portion 947, and the female screw recess of the attachment portion 947 is formed. Two columnar fitting recesses 964 are formed on the upper side and the lower side of the place 962 to be fitted with the fitting protrusions of the articulator. In the inner member 917, two openings 966 that penetrate from the back surface 949 to the inner bottom surface 913 of the inner member 917 are formed on the right and left sides of the female screw recess 962 at the center of the attachment portion 947. The opening 966 is preferably formed with a female screw, and a male screw (bolt) for fixing and supporting the gypsum model to the inner member 917 is passed therethrough. When the inner surface 941 of the inner member 917 is fitted into the recess 942 of the outer member 910, the inner surface 941 forms the same plane as the inner surface 911. The inner member 917 may be chamfered with a circular edge formed by a flat outer back surface 919 and a cylindrical outer peripheral side surface 918. A flat back surface 949 of the mounting portion 947, a cylindrical outer peripheral side surface 948, and the like. The circular edge formed by may be chamfered.

  FIG. 15 shows a perspective view of the two flask halves 93 and 92 separated from each other. Inner member 917 is shown separated from outer member 910. Next, how to use the inner member 917 will be described.

  FIG. 18A shows a state where the inner member 917 of FIGS. 14A to 14C to which the gypsum model 942 to which the occlusal floor 978 is attached is attached is fixed to the articulator 800. FIG. 18B shows a state in which the inner member 917 to which the gypsum model 942 on which the temporary denture 981 made of wax with artificial teeth or the completed resin denture base 981 with artificial teeth is arranged is attached is fixed to the articulator 800. ing.

  Referring to FIG. 18A, in order to create a temporary denture 981, a male screw 956 is screwed into the female screw recess 966 of the inner member 917 of FIGS. The plaster model 942 is fixed and hardened using hardened plaster, and the attachment portion 947 of the inner member 917 is fixed to the upper arch 805 of the articulator 800 with the fixing screw 806 as shown in FIG. 18A. The fitting protrusion 824 of the maxillary arch 805 fits into the recess 964 of the attachment portion 947 of the inner member 917. Next, the occlusal floor 978 is formed on the plaster model 912 fixed to the articulator 800. The occlusal floor 978 is removed once and the compatibility with the intraoral shape of the patient is confirmed. The occlusal floor 978 whose conformity has been confirmed is fixed again to the plaster model 942 on the articulator 800, and artificial teeth are arranged on the wax in accordance with the shape of the occlusal floor 978 as shown in FIG. 18B. A wax-made temporary denture 981 (FIG. 18B) is prepared. Thereafter, the inner member 917 that accommodates the plaster model 941 to which the temporary denture 981 is fixed is removed from the articulator 800, a wax spool is formed, and the half member 93 is accommodated in the recess 922 of the outer member 910. It is formed. With the above-described procedure, a resin-made denture base is molded using the denture base molding device 10 using the flask half portion 93 and another flask half portion 92.

  Then, referring again to FIG. 18B, the flask halves 93 and 92 are then separated, and the inner member 917 is further separated from the flask halves 93 and formed in the gypsum mold half within the recess 912 of the inner member 917. The denture base 981 is exposed. The inner member 917 having the denture base 981 on the plaster model 942 is again fixed to the upper arch 805 of the articulator 800 with the fixing screw 806, and the occlusal compatibility of the denture base 981 can be confirmed using the articulator 800. it can. Therefore, the denture base 981 can be manufactured with high accuracy by a simplified process, and its suitability can be easily confirmed.

  FIGS. 18A and 18B show only the upper plaster model 942 and a temporary or denture placed in the recess of the inner member 917 attached to the maxillary arch 805 of the articulator 800. Similarly, a lower plaster model and a temporary denture or a floor denture disposed in a recess of another inner member can be attached to the lower arch 907 of 800. Thereby, the compatibility of the occlusion of the lower denture base can be confirmed by using the articulator 800, and the lower denture base can be produced with high accuracy in a simplified process. Its suitability can be confirmed.

  As described above, a denture base with high accuracy can be molded using the flask 900 of FIGS. 7A and 7B or the flask 900b of FIGS. 12A and 12B.

  The embodiment described above is merely given as a typical example, and it is obvious to those skilled in the art to combine the components of each embodiment, and variations and variations thereof, and those skilled in the art will understand the principles and claims of the present invention. Obviously, various modifications may be made to the above-described embodiments without departing from the scope of the invention as set forth in the scope.

FIG. 1 shows a procedure for molding a denture using a denture molding machine and a dental flask. FIG. 2 shows the air piping and the principle of operation in the denture molding machine. FIG. 3A shows another example of manual valve and cylinder piping. FIG. 3B shows an example of the arrangement and configuration of two valves. 4A and 4B show the internal shape of the patient's upper half of the flask and the opposite internal shape of the lingual flask half of a conventional flask. FIGS. 5 and 6 show how dough-like resin is injected into a cavity or gap in gypsum in a flask fixed from a resin injection tube in a denture molding machine. . 7A and 7B are side views of a flask half showing the internal shape of the patient's upper or lower jaw flask half and the opposite lingual flask half of a flask according to an embodiment of the present invention. FIG. FIG. 8 shows a perspective view of the two flask halves separated from each other. FIG. 9 shows the dimensions of each of the flask halves. FIGS. 10 and 11 show how the dough-like resin is injected into the cavity or gap in the plaster in the flask fixed from the resin injection tube in the denture molding machine. . FIGS. 12A and 12B show a variation of the flask of FIGS. 7A, 7B and 8, wherein the flask according to another embodiment of the invention has the internal shape of the half of the flask on the upper or lower jaw of the patient and the opposite side. It is a side view of a flask half part which shows the internal shape of the flask half part of the lingual side. FIG. 13A is a side view of the outer member showing the inner shape of the outer member of the flask half. 13B is a cross-sectional view of the outer member along line XIIIB-XIIIB in FIG. 13A. 14A, 14B, 14C, and 14D respectively show a side view, a right side view, a top view, and a rear view as seen from the inner surface side of the inner member 917 of the flask half. . FIG. 15 shows a perspective view of two flask halves separated from each other. FIG. 16 shows a schematic configuration of an example of a normal articulator. FIG. 17A shows a state in which a gypsum model with an occlusal floor attached to an articulator using a normal attachment member in order to create a temporary denture. FIG. 17B shows a state in which an attachment member to which a plaster model on which a wax temporary denture with artificial teeth is arranged is attached is fixed to an articulator. FIG. 18A shows a state where the inner member of FIGS. 14A to 14C to which a gypsum model with an occlusal floor is attached is fixed to an articulator. FIG. 18B shows a state in which the inner member to which the gypsum model on which the temporary denture made of wax with artificial teeth or the completed resin denture base with artificial teeth is arranged is attached is fixed to the articulator.

Explanation of symbols

900 Flask 91, 92 Flask half 904 Mating recess 906 Opening hole for dough-like resin injection 911, 921 Flat inner surface 912, 922 Wide plaster mold recess 913, 923 Wide flat surface 915, 925 Edge S1, S2, Sb Side Ct, Cb1, Cb2 Corners 940, 950 Gypsum mold half

Claims (12)

A dental flask for producing a resin-made denture base consisting of two machined flask halves,
Each of the two flask halves is
A flat inner surface,
A fitting recess which is formed on one surface forming a common plane of the two flask halves and into which a resin injection tube is fitted;
A wide gypsum mold recess formed on the inner surface and having a flat surface with a predetermined depth;
An injection hole that is formed on the inner surface and communicates the fitting recess and the gypsum mold recess;
With
At least one of the two flask halves is formed on a surface opposite to the one surface on which the fitting recess is located, and has a gypsum injection opening communicating with the gypsum mold recess,
The edges of the gypsum mold recess on the flat inner surface of each of the two flask halves have three sides substantially corresponding to partial lines of three sides of the triangle, and the 3 Three arcuate corners connecting each adjacent side of one side, and
Two of the three sides are from the corner on the injection hole side toward the other two corners of the three corners on the opposite surface side. A dental flask for producing a resin-made denture base, which is inclined so as to spread.   Each of the two flask halves has a region between the corner on the fitting recess side of the gypsum mold recess and the fitting recess, and the vicinity thereof, except for the injection hole. The cavity having an outer diameter larger than the injection hole and substantially reaching the one surface or the vicinity where the fitting recess is located from or near the recess for the gypsum mold is substantially absent. The dental flask according to claim 1.   The dental flask according to claim 1 or 2, wherein the two of the three sides form an angle of 55 to 65 degrees with respect to the opposite surface. In the axis of the gypsum mold recess passing through the injection hole and the inner surface, the gypsum mold recess in the direction perpendicular to the axis from the position of the corner on the fitting recess side on the axis. The distance to the position of the maximum width of the place on the axis is greater than two thirds of the height of the gypsum mold recess in the axial direction,
In the plane including the inner surface, the distance in the vertical direction from the axis of the gypsum mold recess to the side and corner of the gypsum mold recess is from the corner on the fitting recess side. It increases substantially monotonously as it approaches the position of the maximum width of the gypsum mold recess,
The dental flask according to any one of claims 1 to 3.   The one of the two flask halves comprises an inner member including the gypsum mold recess and an outer member having a recess into which the inner member can be fitted. The dental flask according to any one of the above.   The dental flask according to claim 5, wherein the inner member has a mounting structure formed on an outer surface of the inner member opposite to the gypsum mold recess.   The dental flask according to claim 5, wherein the inner member has a through-opening that reaches from the outer surface to the flat surface of the gypsum mold recess. A dental flask for producing a resin-made denture base comprising first and second flask halves which are machined,
The first flask half includes an outer member having a recess inside, and an inner member that can be fitted into the recess;
The inner member of the first flask half has a first gypsum mold recess having a wide flat surface of a predetermined depth inside,
The second flask half is paired with the first gypsum mold recess, and has a second gypsum mold recess having a flat surface with a predetermined depth inside. , Dental flask.   The dental flask according to claim 8, wherein the inner member has an attachment structure to an articulator formed on the outer surface of the inner member opposite to the gypsum mold recess.   The dental flask according to claim 8 or 9, wherein the inner member has a through-opening that reaches from the outer surface to the flat surface of the gypsum mold recess. A method for producing a resin denture base using the dental flask according to any one of claims 1 to 10,
A portion of the front tooth side of the wax denture base in which a denture is disposed is arranged on the corner side of the injection hole side in the gypsum mold recess, and the other two corners in the gypsum mold recess By placing the throat side portion of the wax denture base on the part side, the wax denture base is placed in the space in the dental flask,
Placing gypsum around the wax denture base through the gypsum injection opening and curing it,
The wax denture base is melted and discharged to form a gypsum mold having a cavity,
Placing the injection tube containing the dough-like resin in the fitting recess,
Pressurizing the dough-shaped resin in the injection tube, and injecting the dough-shaped resin into the cavity in the gypsum mold through the injection hole,
Thereby, the dough-like resin is caused to flow from the thick cavity portion corresponding to the front tooth side portion of the wax denture base to the thin cavity portion corresponding to the throat side portion of the wax denture base, and A method for producing a resinous dental prosthesis, characterized by filling a cavity. A denture base molding apparatus used together with the dental flask according to any one of claims 1 to 10,
A cylinder containing a piston and having therein first and second variable chambers defined by the piston;
A pressure rod connected to the piston for injecting a dough-like resin in a resin injection tube disposed on the dental flask into the dental flask through an injection opening of the dental flask;
A first valve having a pressurized gas inlet to which pressurized gas is supplied, a first opening communicating with the first variable chamber of the cylinder, a second opening, and an external opening communicating with outside air;
A third opening that communicates with the second opening of the first valve and a fourth opening that communicates with a second variable chamber of the cylinder, wherein the three openings and the fourth opening A second valve capable of adjusting the flow rate of the flow path between,
With
The flow path between the pressurized gas inlet and the second opening is opened, and the flow path between the third opening and the fourth opening is opened, so that the second variable chamber is opened. Pressurized filling with pressurized gas,
The flow path between the pressurized gas inlet and the first opening is opened to pressurize and supply pressurized gas to the second variable chamber, and the second gas filled with the pressurized gas. The moving speed of the piston can be adjusted by adjusting the flow rate of the flow path between the fourth opening communicating with the variable chamber and the third opening communicating with the outside air. Denture base molding equipment.

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