Production method of inverted intraoral cast, production method of intraoral duplicate cast and flask for producing inverted intraoral cast

Abstract

To provide a production method of an intraoral duplicate cast capable of improving duplication accuracy of the cast and flask for producing an inverted intraoral cast.SOLUTION: A production method of an inverted intraoral cast, for producing the inverted intraoral cast, the inverted cast of an intraoral cast 10 imitating the inside of an oral cavity by impression, includes: a material arrangement step of arranging the intraoral cast 10, a liquid impression material ML, and a solid intermediate material MS, respectively in a flask, serving as a container for producing the inverted intraoral cast; and a solidification step of solidifying the impression material in the flask to mold the inverted intraoral cast. The impression material is comprised of an aqueous solution of Gracilaria vermiculophylla. The intermediate material is comprised of agar of Gracilaria vermiculophylla. The flask includes a base body 101, a main body, and a lid body 120.SELECTED DRAWING: Figure 6

Description

Technical Field

[0001] The present invention relates to a method for manufacturing an inverted intraoral model, which is an inverted type of an intraoral model that imitates the intraoral cavity by impression, a method for manufacturing an intraoral duplicate model, and a flask for manufacturing an inverted intraoral model.

Background Art

[0002] Conventionally, in the process of manufacturing dentures, a duplicate model, which is a new model, has been manufactured based on an intraoral model that imitates the intraoral cavity by impression. For example, in Patent Document 1 below, an inverted intraoral model, which is an inverted type of the intraoral model, is manufactured by injecting and solidifying an agar-based impression material into a mold called a flask in which an intraoral model made of plaster is fixed, and a method for manufacturing a duplicate model is disclosed in which plaster is injected into this inverted intraoral model and solidified to manufacture a duplicate model of the intraoral model.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

[0004] However, in the method for manufacturing a duplicate model described in Patent Document 1 above, when the liquid impression material heated to about 90°C cools and solidifies, the inverted intraoral model is not formed into an accurate inverted shape with respect to the intraoral model (hereinafter also referred to as the "master model") due to condensation, and thus there is a problem that the replication accuracy of the duplicate model manufactured with this inverted intraoral model is low.

[0005] More specifically, in the inverted intraoral model, the convex part in the inverted intraoral model is formed smaller than the concave part in the master model, and the concave part in the inverted intraoral model tends to be formed larger than the convex part in the master model, and there has been a problem that the replication accuracy of the duplicate model formed by this inverted intraoral model is low.

[0006] The present invention has been made to address the above problems, and an object thereof is to provide a method for manufacturing an intraoral mold inversion type capable of improving the replication accuracy of a duplicate mold, a method for manufacturing an intraoral duplicate mold, and a flask for manufacturing an intraoral mold inversion type.

Summary of the Invention

[0007] In order to achieve the above object, a feature of the present invention is a method for manufacturing an intraoral mold inversion type, which is an inversion type of an intraoral mold molded by an impression in the oral cavity, the method including a material placement step of placing an intraoral mold, a liquid impression material, and a solid intermediate material in a flask that is a container for manufacturing the intraoral mold inversion type, and a solidification step of solidifying the impression material in the flask to form the intraoral mold inversion type.

[0008] According to this, in the method for manufacturing an intraoral mold inversion type, the solidification shrinkage of the impression material can be suppressed by placing a solid intermediate material in addition to the liquid impression material in the flask in which the intraoral mold is placed and solidifying the impression material, so that the intraoral mold inversion type can be accurately formed, and as a result, the replication accuracy of the duplicate mold can be improved. Further, according to this method for manufacturing an intraoral mold inversion type, displacement of the intraoral mold when injecting the liquid impression material into the flask can be prevented. The liquid impression material includes a viscous fluid.

[0009] Also, another feature of the present invention is that in the method for manufacturing the intraoral mold inversion type, in the material placement step, the intermediate material is placed between the intraoral mold and the inner peripheral surface of the flask in the flask.

[0010] According to this, in the method for manufacturing an intraoral mold inversion type, since the intermediate material is placed between the intraoral mold and the inner peripheral surface of the flask, the outer dentition forming portion of the intraoral mold inversion type can be accurately formed.

[0011] Also, another feature of the present invention is that in the method for manufacturing the intraoral mold inversion type, the intermediate material is composed of a solidified impression material of the same material as the impression material.

[0012] According to this, in the method for producing an intraoral model inversion mold, since the intermediate material is composed of a solidified impression material of the same material as the impression material, the entire intraoral model inversion mold can be reused as an impression material by melting it after using the intraoral model inversion mold.

[0013] Another feature of the present invention is that, in the method for producing an intraoral model inversion mold, a plurality of intermediate materials are arranged in a flask.

[0014] According to this, in the method for producing an intraoral model inversion mold, since a plurality of intermediate materials are arranged in a flask, the shrinkage during solidification of the impression material can be more effectively suppressed, and the intraoral model inversion mold can be accurately molded.

[0015] Another feature of the present invention is that, in the method for producing an intraoral model inversion mold, the plurality of intermediate materials arranged in the flask are formed in different sizes from each other.

[0016] According to this, in the method for producing an intraoral model inversion mold, since the plurality of intermediate materials are formed in different sizes from each other, intermediate materials of sizes corresponding to the sizes of the spaces in the flask can be arranged, the shrinkage during solidification of the impression material can be more effectively suppressed, and the intraoral model inversion mold can be accurately molded.

[0017] Another feature of the present invention is that, in the method for producing an intraoral model inversion mold, the intermediate material is agar-agar of ogo-nori.

[0018] According to this, in the method for producing an intraoral model inversion mold, since the intermediate material is composed of agar-agar of ogo-nori, the shrinkage during solidification of the impression material can be more effectively suppressed compared to the case where it is composed of agar other than ogo-nori (for example, tengusa) according to the experiments of the present inventor, and the intraoral model inversion mold can be accurately molded.

[0019] Further, another feature of the present invention is that in the method for manufacturing an intraoral model inversion type, the material placement step is to remove air bubbles adhering to the intraoral model immersed in the impression material.

[0020] According to this, in the method for manufacturing an intraoral model inversion type, in order to remove air bubbles adhering to the intraoral model immersed in the impression material, the solidification shrinkage of the impression material can be more effectively suppressed, and the intraoral model inversion type can be accurately molded. In this case, in the method for manufacturing an intraoral model inversion type, air bubbles adhering to the surface or gaps of the intraoral model can be effectively removed by stroking the surface of the intraoral model with a pen.

[0021] In addition, the present invention can be implemented not only as an invention of a method for manufacturing an intraoral model inversion type, but also as an invention of a method for manufacturing an intraoral double model and a flask for manufacturing an intraoral model inversion type.

[0022] Specifically, the method for manufacturing an intraoral double model is a method for manufacturing an intraoral double model, which is a new model based on an intraoral model that has modeled the inside of the mouth by an impression, and includes injecting a liquid impression material for manufacturing a double model into the intraoral model inversion type manufactured by the method for manufacturing an intraoral model inversion type according to any one of claims 1 to 7 and solidifying it. According to this, the method for manufacturing an intraoral double model can be expected to have the same operational effects as the invention of the method for manufacturing an intraoral model inversion type.

[0023] In addition, the flask for manufacturing an intraoral model inversion type is a flask for manufacturing an intraoral model inversion type, which is an inversion type of an intraoral model that has modeled the inside of the mouth by an impression, and includes a base body on which the intraoral model is placed, and a main body formed in a cylindrical shape with a height equal to or higher than the height of the intraoral model while covering the periphery of the intraoral model placed on the base body and detachably placed on the base body. According to this, the flask for manufacturing an intraoral model inversion type can effectively implement each invention of the method for manufacturing an intraoral model inversion type and the method for manufacturing an intraoral double model.

[0024] In this case, in the flask for manufacturing an intraoral model inversion type, it is preferable to further include a lid that closes at least a part of the upper end opening in the main body. According to this, the flask for manufacturing an intraoral model inversion type can prevent the impression material injected into the main body from overflowing from the main body.

[0025] Also, in these cases, in the flask for manufacturing an intraoral model inversion type, the lid preferably has a communication opening that communicates with the inside of the main body. According to this, the flask for manufacturing an intraoral model inversion type can be injected into the main body through the communication opening while preventing the impression material from overflowing from the main body.

Brief Description of the Drawings

[0026]

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Embodiments for Carrying Out the Invention

[0027] Hereinafter, an embodiment of a method for manufacturing an intraoral model inversion type, a method for manufacturing an intraoral multiple model, and a flask for manufacturing an intraoral model inversion type according to the present invention will be described with reference to the drawings. FIG. 1 is a flowchart showing the working process of the method for manufacturing an intraoral model inversion type according to an embodiment of the present invention.

[0028] Here, the intraoral model, the inverted intraoral model, and the intraoral composite model will be described respectively. The intraoral model (hereinafter sometimes simply referred to as the "master model") is a model fabricated by imitating the patient's oral cavity using an impression material when fabricating a denture, and is generally composed of gypsum. Further, the inverted intraoral model (hereinafter sometimes simply referred to as the "inverted model") is an inverted model of the master model, and is fabricated by a flask for fabricating an inverted intraoral model according to the present invention. Further, the intraoral composite model (hereinafter sometimes simply referred to as the "composite model") is a replica of the master model formed by the inverted model, and is a model used when fabricating a denture.

[0029] Before explaining the method for fabricating an inverted intraoral model and the method for fabricating an intraoral composite model according to the present invention, a flask 100 for fabricating an inverted intraoral model (hereinafter sometimes simply referred to as the "flask") used in the method for fabricating an inverted intraoral model will be explained.

[0030] (Configuration of Flask 100) The flask 100 is a tool for fabricating an inverted model and a composite model using a master model, and is formed in a container shape capable of accommodating the inverted model. As shown in FIG. 2, this flask 100 mainly includes a base body 101, a main body 110, and a lid body 120.

[0031] The base body 101 is a component for placing the master model, and is formed by shaping a metal material or a resin material into a trapezoidal shape. Specifically, the base body 101 includes a stage 102 and a bottom portion 103 respectively.

[0032] The stage 102 is a portion where the master model is placed and the upper surface of the inverted model is formed, and is formed in a trapezoidal shape by a metal material (for example, stainless steel material). In the present embodiment, the stage 102 is formed in a substantially triangular shape with a rounded apex in plan view.

[0033] The bottom 103 is a portion on which the main body 110 is placed while supporting the stage 102, and is formed in a plate shape that projects in a flange shape below the stage 102. That is, the bottom 103 is formed in a substantially triangular shape that is one size larger than the stage 102 in plan view. As a result, an annular body placement portion 103a is formed on the bottom 103 in a state of projecting in a flange shape from the stage 102.

[0034] The body placement portion 103a is a portion on which the main body 110 is placed, and is formed to project with an overhang amount substantially the same as the thickness of the main body 110 with respect to the stage 102.

[0035] In this embodiment, the base body 101 is manufactured by machining such as plastic working, cutting, or grinding of a metal material (for example, a stainless steel material). That is, in this embodiment, the base body 101 is configured by integrally molding the stage 102 and the bottom 103. Note that when the base body 101 is made of a resin material, it can be manufactured by a known molding method such as injection molding.

[0036] The main body 110 is a component that surrounds the periphery of the stage 102 and forms an inverted outer peripheral portion, and is formed by molding a metal material or a resin material into a cylindrical shape. In this embodiment, the main body 110 is made of a metal material (for example, a stainless steel material). This main body 110 is formed in a cylindrical shape that extends upward from the body placement portion 103a. In this embodiment, the main body 110 is formed in a substantially triangular cylindrical shape with a rounded apex in plan view.

[0037] That is, the main body 110 is formed in a cylindrical shape that is placed on the body mounting portion 103a and fitted to the outer peripheral portion of the stage 102. Also, the height of the main body 110 is formed to be higher than the height of the master model placed on the stage 102. This main body 110 is manufactured by machining such as plastic processing, cutting processing, or grinding processing of a metal material. In addition, when the main body 110 is made of a resin material, it can be manufactured by a known molding method such as injection molding.

[0038] The lid 120 is a component that covers the upper end opening 111 of the main body 110 and forms the upper surface of the inverted type, and is formed by molding a metal material or a resin material into a lid shape. In the present embodiment, the lid 120 is made of a metal material (for example, stainless steel). This lid 120 is composed of a top plate portion 121 and a fitting portion 123.

[0039] The top plate portion 121 is a portion that covers the upper end opening 111 of the main body 110 and is formed in a plate shape. In the present embodiment, the top plate portion 121 is formed in a substantially triangular shape with rounded vertices in a plan view. Communication openings 122a, 122b, and 122c are respectively formed in this top plate portion 121.

[0040] The communication openings 122a, 122b, and 122c are through holes for arranging an impression material and an intermediate material, which will be described later, in the main body 110 and for confirming the injection state of the impression material. In this case, the communication openings 122a and 122b are formed in a long hole shape so as to be located on the portions imitating the left and right back teeth in the master model. Also, the communication opening 122c is formed in an arc-shaped long hole shape so as to be located on the portion imitating the front teeth in the master model.

[0041] The fitting portion 123 is a portion that fits into the upper end opening 111 of the main body 110, and is formed in a wall shape that droops from the outer edge of the top plate portion 121. This fitting portion 123 is formed by bending the outer edge of the top plate portion 121. That is, the lid body 120 is integrally formed with the top plate portion 121 and the fitting portion 123. Specifically, the lid body 120 is manufactured by machining such as plastic working, cutting, or grinding of a metal material. In addition, when the lid body 120 is made of a resin material, it can be manufactured by a known molding method such as injection molding.

[0042] (Method for manufacturing an intraoral model inversion mold) Next, a method for manufacturing an intraoral model inversion mold according to the present invention will be described. First, as a first step, the operator prepares a master model 10 and a flask 100 respectively. Here, the master model 10 is manufactured by a known method for a model in a patient's oral cavity that is the object of denture production. In addition, for the flask 100, a base body 101, a main body 110, and a lid body 120 are respectively prepared.

[0043] Next, as a second step, the operator places the master model 10 on the base body 101. Specifically, as shown in FIG. 4, the operator places the tooth model portion 11 of the master model 10 upward on the central portion of the base body 101. In this case, when there is no tooth model portion 11 in the master model 10, that is, when only the gum model portion 12 exists, the operator places the gum model portion 12 upward.

[0044] Next, as a third step, the operator immerses the master model 10 in the impression material ML. Specifically, as shown in FIG. 5, after placing the main body 110 on the body placement portion 103a of the base body 101 where the master model 10 is placed and attaching the main body 110 to the base body 101, the operator injects the impression material ML into the internal space of the main body 110.

[0045] Here, the impression material ML is a raw material that constitutes the inversion mold 20, and is made of a material that has the property of solidifying from a fluid state such as a liquid that covers the outer surface of the master mold 10 to form the inversion mold 20 in a solid state. Specifically, the impression material ML can be composed of a liquid obtained by dissolving the powder of red algae such as tengusa, ogonori, suginoori, macsa, nanbugusa, egonori, oobusa, oniksa, or hirakusa in hot water, or a viscous body of silicon. In the present embodiment, the impression material ML is an aqueous solution obtained by dissolving the powder of ogonori in hot water.

[0046] The operator injects the impression material ML into the flask 100 until it is immersed at least up to the upper end of the master mold 10. In this case, the impression material ML is a translucent liquid. Therefore, in order to facilitate the operation in the next process, the operator should inject the impression material ML so that the water level is near the upper end rather than exceeding the upper end of the master mold 10 by a large margin.

[0047] Next, as a fourth step, the operator removes the bubbles adhering to the outer surface of the master mold 10. Specifically, the operator can remove the bubbles adhering to the outer surface of the master mold 10 by stroking the outer surface of the master mold 10 in the liquid immersed in the impression material ML with a brush (for example, a writing brush used for calligraphy or drawing) not shown in the figure.

[0048] Next, as a fifth step, the operator arranges the intermediate material MS around the master mold 10. Here, the intermediate material MS is a solid that is immersed in the impression material ML together with the master mold 10. In the present embodiment, the intermediate material MS is composed of a solid obtained by solidifying the impression material ML. That is, the intermediate material MS is composed of ogonori-based agar.

[0049] As shown in FIGS. 6 and 7 respectively, the operator places the intermediate material MS in the internal space of the main body 110 where the master model 10 and the impression material ML are arranged. In this case, the operator places the intermediate material MS in the internal space of the main body 110 in the outer and inner regions of the tooth model portion 11 (or the tooth root model portion 12) of the master model 10. Also, the operator places a plurality of intermediate materials MS of different sizes in each region. That is, the operator places a small-shaped intermediate material MS in a small gap and a large-shaped intermediate material MS in a large gap within the main body 110.

[0050] In this embodiment, the operator mainly places a block-shaped (cuboid-shaped) intermediate material MS in the outer region of the tooth model portion 11 of the master model 10 and a gravel-shaped or granular intermediate material MS in the inner region of the tooth model portion 11. In this case, the operator can cut or break a large lump of the intermediate material MS into appropriate sizes using tools such as hands or a knife to obtain intermediate materials MS of different sizes. Also, in this case, the operator may use the pen used in the fourth step to remove the air bubbles attached to the outer surface of the master model 10 or the air bubbles attached to the outer surface of the intermediate material MS again.

[0051] Next, as the sixth step, the operator adds the impression material ML into the flask 100. Specifically, as shown in FIG. 8, after fitting the fitting portion 123 outside the upper end opening 111 of the main body 110 and covering the main body 110 with the lid body 120, the operator injects the impression material ML into the main body 110 through the communication openings 122a, 122b, 122c. In this case, the operator can add and arrange the intermediate material MS into the main body 110 through the communication openings 122a, 122b, 122c.

[0052] The operator injects the impression material ML into the flask 100 until the upper end of the master model 10 is sufficiently immersed in the impression material ML. In the present embodiment, the operator injects the impression material ML until the liquid level of the impression material ML reaches the communication openings 122a, 122b, and 122c. In this case, the operator may completely immerse the intermediate material MS disposed around the master model 10 in the impression material ML.

[0053] The placement step of the master model 10 in these second steps, the injection step of the impression material ML in the third step, the placement step of the intermediate material MS in the fifth step, and the additional injection step of the impression material ML in the sixth step correspond to the material placement step according to the present invention.

[0054] Next, as the seventh step, the operator solidifies the impression material ML. Specifically, the operator cools the flask 100 containing the master model 10, the intermediate material MS, and the impression material ML respectively using an air-cooling or water-cooling method. Thereby, the impression material ML is solidified along the shape of the master model 10 and formed into an inverted shape imitating the same shape. The step of solidifying the impression material ML corresponds to the solidification step according to the present invention.

[0055] Next, in the eighth step, the operator obtains the inverted mold 20. Specifically, as shown in FIG. 9, the operator removes the base body 101 in the flask 100 from the main body 110. As a result, the bottom surface of the master model 10 placed on the stage 102 of the base body 101 in the flask 100 is exposed to the outside. Therefore, the operator can remove the master model 10, part of which is exposed to the outside, from the solidified impression material ML. Thereby, the operator can expose the inverted mold 20 formed in the inverted shape of the master model 10 in the main body 110 to the outside and obtain the inverted mold 20.

[0056] (Method for manufacturing an intraoral duplicate model) Next, a method for manufacturing an intraoral duplicate model according to the present invention will be described. As shown in FIG. 10, as a first step, an operator prepares an inverted mold 20 manufactured by the above-described method for manufacturing an intraoral mold inverted mold and an impression material MF for manufacturing a duplicate model. In this case, the operator can prepare the inverted mold 20 while it is accommodated in the main body 110. In this case, the lid 120 may be attached to or removed from the main body 110.

[0057] Further, the impression material MF for manufacturing a duplicate model is a raw material for forming a duplicate model 30 of the master model 10, and is composed of a material having a property of solidifying from a fluid state such as a liquid covering the outer surface of the inverted mold 20 into a solid state for forming the duplicate model 30. Specifically, the impression material MF for manufacturing a duplicate model is composed of gypsum, similar to the master model 10.

[0058] Next, as a second step, the operator manufactures the duplicate model 30. Specifically, as shown in FIG. 11, the operator injects the impression material MF for manufacturing a duplicate model into the inverted mold 20 and solidifies it. Thereby, as shown in FIG. 12, the operator can form the impression material MF for manufacturing a duplicate model into an inverted shape imitating the shape of the inverted mold 20, that is, the same shape as the master model 10.

[0059] Next, as a third step, the operator removes the duplicate model 30. Specifically, after the operator removes the inverted mold 20 in which the duplicate model 30 is formed from the main body 110, the operator removes the duplicate model 30 from the inverted mold 20. Thereby, the operator can obtain the duplicate model 30. Further, the inverted mold 20 peeled off from the duplicate model 30 can be reused as a raw material for the impression material ML or the intermediate material MS again by heating and melting it.

[0060] As can be understood from the above operation description, according to the above embodiment, in addition to the liquid impression material ML, a solid intermediate material MS is arranged in the flask 100 in which the master model 10 is arranged, and the impression material ML is solidified, so that the setting shrinkage of the impression material ML can be suppressed, and thus the inverted mold 20 can be accurately molded. As a result, the replication accuracy of the duplicate model 30 can be improved. Further, according to this method for manufacturing an intraoral model inverted mold, displacement of the master model 10 when injecting the liquid impression material ML into the flask 100 can be prevented.

[0061] Furthermore, in the practice of the present invention, it is not limited to the above embodiment, and various modifications are possible without departing from the object of the present invention. In the description of each modification example, the same reference numerals are given to the same parts as those in the above embodiment, and the overlapping description is omitted.

[0062] For example, in the above embodiment, the operator arranged the intermediate material MS outside (that is, between the tooth model portion 11 and the inner peripheral wall of the main body 110) and inside the tooth model portion 11 of the master model 10 in the flask 100. However, the operator may arrange the intermediate material MS only in one of the outer region and the inner region of the tooth model portion 11 of the master model 10 in the flask 100.

[0063] Also, in the above embodiment, the operator arranged the intermediate material MS above the tooth model portion 11 of the master model 10 in the flask 100. However, the operator can also omit arranging the intermediate material MS above the tooth model portion 11 of the master model 10 in the flask 100.

[0064] In the above embodiment, the operator arranged a plurality of intermediate materials MS around the master model 10 in the flask 100. However, the operator may arrange at least one intermediate material MS in the vicinity of the master model 10 in the flask 100. The amount of the intermediate material MS to be arranged in the flask 100 is not particularly limited, but it is preferably 20% or more and 80% or less of the volume of the flask 100, more preferably 30% or more and 60% or less.

[0065] In the above embodiment, the operator arranged intermediate materials MS of different sizes around the master model 10 in the flask 100. In this case, the intermediate materials MS of different sizes may be similar to each other, but are preferably configured with different shapes. Also, in this case, the intermediate material MS may be spherical (including oblate spheres), rectangular parallelepiped, cube, or cone, but it is preferably configured with an irregular shape body having an irregular shape rather than a fixed shape. However, the operator may arrange intermediate materials MS of the same size in the vicinity of the master model 10 in the flask 100.

[0066] In the above embodiment, the intermediate material MS was made of the same material as the impression material ML. However, the intermediate material MS only needs to be formed in a solid state and does not necessarily have to be made of the same material as the impression material ML. Therefore, the intermediate material MS may be made of agar of red algae different from the impression material ML. Also, the intermediate material MS can be made of materials other than agar, for example, metal materials, resin materials, wood, or ceramic materials.

[0067] In the above embodiment, the impression material ML was made of a solution of ogo nori. However, the impression material ML can be made of a solution of red algae other than ogo nori or a silicon material. In this case, according to the experiments of the present inventor, compared with the case of being made of agar other than ogo nori (for example, tengusa), the solidification shrinkage of the impression material can be more effectively suppressed and the inverted type of the oral cavity model can be accurately molded.

[0068] In the above embodiment, the operator is configured to remove the air bubbles adhering to the outer surface of the master model 10 in the fourth step. As a result, the operator can accurately mold the inversion mold 20. However, the operator can also omit the step of removing air bubbles in the fourth step.

[0069] In the above embodiment, the material placement step according to the present invention is configured in the order of the placement step of the master model 10 in the second step, the injection step of the impression material ML in the third step, the placement step of the intermediate material MS in the fifth step, and the additional injection step of the impression material ML in the sixth step. However, the order of some steps in this material placement step can also be changed.

[0070] For example, in the material placement step, the impression material ML may be injected after the intermediate material MS is placed in the main body 110 in which the master model 10 is placed. Also, in the material placement step, the master model 10 or the intermediate material MS may be placed after the impression material ML is injected into the main body 110 assembled to the base body 101. Also, the material placement step can be configured by omitting the additional injection step of the impression material ML in the sixth step.

[0071] In the above embodiment, the operator injected the impression material MF for making a duplicate mold into the inversion mold 20 housed in the main body 110 to make the duplicate mold 30. However, the operator can also inject the impression material MF for making a duplicate mold into the inversion mold 20 taken out from the main body 110 to make the duplicate mold 30.

[0072] In the above embodiment, the flask 100 is configured to include a base body 101, a main body 110, and a lid body 120, respectively. However, the flask 100 can also be configured by omitting the lid body 120.

[0073] In this case, as shown in FIG. 13, the main body 110 may be provided with an inward extending portion 112 formed by extending the edge of the upper end opening 111 inward. According to this, the inward extending portion 112 can suppress the impression material ML from overflowing from within the main body 110.

[0074] Also, as shown in FIG. 14, the flask 100 can also be formed by connecting the lid body 120 to the main body 110. In this case, the lid body 120 can be configured by omitting the fitting portion 123 with respect to the top plate portion 121 and connecting to the main body 110 via a hinge 124, so that the upper end opening 111 of the main body 110 can be configured to be openable and closable.

[0075] Also, as shown in FIG. 15, the flask 100 can also be configured such that the stage 102 and the bottom portion 103 in the base body 101 are separate bodies.

[0076] Also, in the above embodiment, the lid body 120 is configured to include the communication openings 122a to 122c respectively. However, as shown in FIG. 15, the lid body 120 can also be configured by omitting the communication openings 122a to 122c respectively.

Explanation of Reference Numerals

[0077] MS… intermediate material, ML… impression material, MF… impression material for making a duplicate model, 10… intraoral model (master model), 11… tooth model part, 12… gingiva model part, 20… inverted intraoral model (inverted model), 30… duplicate model, 100… flask for making an inverted intraoral model, 101… base body, 102… stage, 103… bottom portion, 103a… body placement portion, 110… main body, 111… upper end opening, 112… inward extending portion, 120… lid body, 121… top plate portion, 122a, 122b, 122c… communication openings, 123… fitting portion, 124…hinge.

Claims

1. A method for manufacturing an inverted dental cast, which is an inverted form of a dental cast that mimics the oral cavity by impression, comprising: a material placement step of placing the dental cast, a liquid impression material, and a solid intermediate material in a flask, which is a container for manufacturing the inverted dental cast; a solidification step of solidifying the impression material in the flask to form the inverted dental cast. The method for manufacturing an inverted dental cast is characterized by including these steps.

2. In the method for manufacturing an inverted dental cast according to Claim 1, the material placement step is characterized by placing the intermediate material between the dental cast and the inner peripheral surface of the flask in the flask. The method for manufacturing an inverted dental cast is as described above.

3. In the method for manufacturing an inverted dental cast according to Claim 1, the intermediate material is composed of a solidified impression material of the same material as the impression material. The method for manufacturing an inverted dental cast is characterized by this.

4. In the method for manufacturing an inverted dental cast according to Claim 1, the intermediate material is characterized by being arranged in a plurality in the flask. The method for manufacturing an inverted dental cast is as described above.

5. In the method for manufacturing an inverted dental cast according to Claim 4, the plurality of intermediate materials arranged in the flask are formed in different sizes from each other. The method for manufacturing an inverted dental cast is characterized by this.

6. In the method for manufacturing an inverted dental cast according to Claim 1, the intermediate material is agar-agar. The method for manufacturing an inverted dental cast is characterized by this.

7. In the method for manufacturing an inverted dental cast according to Claim 1, the material placement step is characterized by removing bubbles adhering to the dental cast immersed in the impression material. The method for manufacturing an inverted dental cast is as described above.

8. A method for manufacturing a multiple dental cast, which is a new cast based on a dental cast that mimics the oral cavity by impression, comprising: a step of injecting and solidifying a liquid impression material for manufacturing a multiple dental cast into the inverted dental cast manufactured by the method for manufacturing an inverted dental cast according to any one of Claims 1 to 7. The method for manufacturing a multiple dental cast is characterized by including this step.

9. A flask for manufacturing an inverted dental cast, which is an inverted form of a dental cast that mimics the oral cavity by impression, comprising: a base body on which the dental cast is placed; An in - mouth model inversion type flask for production, comprising a main body formed in a cylindrical shape with a height equal to or higher than the height of the in - mouth model while covering the periphery of the in - mouth model placed on the base body, and being detachably placed on the base body.

10. In the in - mouth model inversion type flask for production according to Claim 9, further, An in - mouth model inversion type flask for production, characterized in that it comprises a lid for closing at least a part of the upper end opening of the main body.

11. In the in - mouth model inversion type flask for production according to Claim 10, The lid, An in - mouth model inversion type flask for production, characterized in that it has a communication opening communicating with the inside of the main body.

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