Denture polymerization molding model and denture manufacturing method

Abstract

[Problem] To provide, in a relatively inexpensive manner, a polymerization molding model which has high molding accuracy and surface density and enables easy release from a molded resin after polymerization molding, and a polymerization molding method. [Solution] A molding model for polymerization molding of dentures comprises: a thin-skin cup model having an internal space which is opened downward by means of a three-dimensional recessed surface on the back side of a three-dimensional molding part made of a thin-skin body having a constant thickness; and a dental plaster that is filled in the internal space opened downward of the thin-skin cup model and is solidified. After polymerization molding, the solidified dental plaster is destroyed and removed from the internal space; the three-dimensional molding part made of the thin-skin body is bent or folded and deformed, and the thin-skin body of the three-dimensional molding part is peeled from a polymerized main molded resin body resulting from denture base molding for demolding.

Description

A composite model of dentures and a method for fabricating dentures.

[0001] This invention relates to a polymerized denture model for use in polymerized dentures, and a method for manufacturing dentures using the same. Dentures consist of a denture base made of molded resin and artificial teeth attached thereto. The polymerized molding model of the present invention particularly relates to a molding model for polymerizing one side (front or back) of the three-dimensional molded surface of the denture base of the denture. Furthermore, the method for manufacturing dentures of the present invention relates to polymerizing a denture using the polymerized molding model.

[0002] Regarding conventional polymerization, hardening, and bonding treatments for dentures, for example, a method for removing dentures through the following steps (A) to (D) is disclosed (hereinafter referred to in Patent Document 1).

[0003] (A) An impression is taken of one of the patient's mucous membranes, and a plaster model is prepared in a flask. A sheet of olefin-based thermoplastic elastomer is placed on the mucous membrane surface of this model and heated and softened with hot air to form a rubber elastic material layer that matches the shape of the mucous membrane surface of the model. (B) An olefin-based room-temperature plastic material is placed on the rubber elastic material layer and stretched to the desired shape and thickness to form a room-temperature plastic material layer. The rubber elastic material layer must be visible around the periphery of the room-temperature plastic material layer. (C) Adhesive is applied to the surface of the room-temperature plastic material layer and the surface of the rubber elastic material layer and allowed to dry. This adhesive must be applied to at least the surface of the rubber elastic material layer visible around the periphery of the room-temperature plastic material layer and the surface of the partition. A mochi-like PMMA resin is sandwiched between the plaster mold that has been formed in advance in the flask and the model described above, and compressed and molded. (D) Subsequently, the pair of flasks, stacked on top of each other, are placed in a vortex or steam at approximately 100°C to 120°C to polymerize and harden the PMMA resin, forming the denture base. At the same time, the rubber elastic material layer adheres to the denture base. If an olefin-based resin material is used as the material for the room-temperature plastic material layer as described above, and an adhesive is applied to its surface, this room-temperature plastic material layer also adheres to the denture base. After polymerization, hardening, and bonding, the denture is cooled, the plaster mold is broken, and the denture can be removed.

[0004] Conventionally, there has also been disclosed a method for fabricating a denture and a denture mucosa bed, which includes steps of making an upper and lower split mold (Patent Document 2). The following steps for removing the denture are described in this document.

[0005] "The fabricated wax denture was adjusted finely by fitting it to the patient as needed, and then the wax denture was placed in a flask to make an upper and lower split mold... Next, after heating the split mold to remove the wax placed on the denture mucosa bed, resin is filled into the space formed by removing the wax, that is, the space formed between the denture mucosa bed and the artificial tooth. After curing the resin by polymerization treatment, the denture, which is a molded product, is removed from the split mold" (paragraphs 0029, 0030).

[0006] Conventionally, there has also been disclosed a method for providing an integrated denture of a maintenance device and a denture base using a 3D printer in order to reduce the time and cost of denture fabrication (see Patent Document 3). According to this method, "after producing 3D data of a denture in which a maintenance device and a denture base are integrated by CAD, it is output by a 3D printer, and other parts are added as needed to complete the denture."

[0007] Japanese Patent Laid-Open No. 01-94850, Japanese Patent Laid-Open No. 2008-119210, Japanese Patent Laid-Open No. 2019-141553

[0008] However, when three-dimensionally forming the conventional plaster mold or split mold with a three-dimensional printer, while the obtained three-dimensional formed body is likely to ensure high forming accuracy and surface density, it becomes difficult to separate from the denture base after polymerization molding. That is, when using the three-dimensional formed body by a three-dimensional printer as a molding die for polymerization molding, the resin of the denture base, which is the molded resin after polymerization molding, adheres to the molding surface of the three-dimensional formed body, and there has been a problem that the work of separating the resin of the denture base requires labor and skills.

[0009] In particular, when an undercut portion is included in a part of the three-dimensional formed body that is the molding die, it becomes difficult to remove the mold. Also, using a special device or special resin for mold removal makes it expensive.

[0010] Therefore, the objectives of the present invention are to provide a polycomposite model that has high molding accuracy and surface density, and that can be easily demolded from the molded resin (denture base resin) after polycomposite molding, at a relatively low cost, and to provide a method for manufacturing dentures using such a polycomposite model.

[0011] To address the above issues, the following measures have been taken. Note that the numbers or combinations of numbers and letters following each component name below are reference symbols intended to help understand the morphological examples of each component name by referring to the drawings, and do not specify or limit the concept or embodiment of each component.

[0012] (1) The composite model (1) of a denture according to the present invention is characterized by comprising: a thin-skin cup model (100) which is formed as a three-dimensional molded part (11) consisting of a thin skin of a constant thickness along the molded surface, and whose molded surface of a resin having a three-dimensional molded shape obtained by three-dimensional printing has a three-dimensional convex surface in the shape of a gum that faces the denture base, and has an internal space that is open at the bottom due to the three-dimensional concave surface on the back side of the three-dimensional molded part (11) consisting of a thin skin; and dental gypsum (1DP') which is filled into the open internal space of the thin-skin cup model (100) and solidified.

[0013] In this invention, three-dimensional printing refers to the process of creating a three-dimensional object using a three-dimensional printer based on three-dimensional molding data obtained from a three-dimensional scan. By using a three-dimensional molded resin, high molding accuracy and surface density can be maintained. After polycomposition, separation becomes easy due to slight deformation of a thin layer of a certain thickness. Furthermore, since the internal space is filled with dental gypsum, it results in an inexpensive molded product.

[0014] (2) The composite model (1) of the denture according to the present invention is characterized in that the thin skin of the thin skin cup model (100) is made of an elastic resin that is formed with a substantially constant thickness of 1.0 mm to 3.0 mm and an error range of ±0.5 mm in the three-dimensional molded part (11) that constitutes the molded surface of the denture base.

[0015] By molding to a constant thickness, high-precision three-dimensional molding becomes possible. Furthermore, setting the molding thickness to 1.0 mm or more ensures shape retention accuracy, while setting it to less than 3.0 mm ensures elastic deformability during demolding. If it is too thin, the gypsum filling inside may cause the three-dimensional molded shape to distort or break.

[0016] Furthermore, during demolding, the thin-shell cup model (100) is peeled off the polymerized denture base and, if necessary, partially cut and separated. However, if it is too thick, cutting and demolding cannot be easily performed.

[0017] Furthermore, setting the thickness to between 1.4 mm and less than 2.0 mm is preferable in terms of balancing ease of demolding and strength. Setting it to less than 2.0 mm provides an upper limit for thickness that is easy to break and remove, while also suppressing the increase in costs due to excess resin material.

[0018] The "thin-shell cup model (100)" has an internal space with an opening on the back side of the three-dimensional molded part 11. By filling this internal space with dental plaster 1DP and solidifying it to become 1DP', the "heavy composite model (1)" of the denture is formed.

[0019] Furthermore, in the "thin-skin cup model (100)" and the "heavy composite model," if the thin skin of the three-dimensional molded part (11) is made of a resin material mainly composed of either AP resin or ABS resin, it is preferable to set the thickness to a constant value of more than 1.0 mm and less than 2.0 mm. For example, the "thin-skin cup model (100)" and the "thin skin of the three-dimensional molded part (11)" in the embodiments described later consist of a substantially constant standard thickness of 1.5 mm ± 0.5 mm and the sum of its error thickness.

[0020] (3) In any of the above composite model (1) of the denture, the molded surface of the resin having the three-dimensional molded shape in the molded model for composite molding of the denture is characterized in that, after composite molding, a part of the internal structure other than the molded surface of the resin is destroyed and removed, or a part of the surface structure other than the molded surface of the resin is cut, fractured, bent, or folded and deformed, and the thin skin of the three-dimensional molded part (11) can be peeled off and demolded from the polymerized main molded resin body (4) (molded resin with the finished shape) that has been molded as the denture base.

[0021] (4) In any of the above composite models (1) of dentures, the thin skin of the three-dimensional molded part (11) is molded with a colored resin that is different in color from both the gypsum color and the denture base resin color.

[0022] After polymerization, the thin layer of the three-dimensional molded part (11) embedded in the upper and lower plaster layers becomes easily visible or recognizable. In other words, since dental plaster DP is a natural white color, when the dental plaster DP' that has been filled and solidified in the internal space is broken with forceps, the molding material of the thin layer of the three-dimensional molded part (11) made of colored resin appears first from the embedded plaster layers, making it possible to grasp the position of the embedded molded resin denture base, and making it easy to remove the denture base without damaging it.

[0023] Furthermore, in the method for creating dentures, a mold release agent application step is performed, in which a mold release agent is applied to the surface of the "thin-shell cup model (100)" that is facing the molded resin of the denture base. Applying a mold release agent makes it easier to demold the special resin shell after polymerization.

[0024] (5) In any of the above composite models (1) of dentures, the thin skin of the three-dimensional molded part (11) is characterized in that the internal space is open to the back side in a predetermined opening shape, and an opening frame (12) of a certain height is formed at the open end in the circumferential direction, and multiple protruding frames (142, 17) are provided around this opening frame, and fitting protrusions or fitting recesses are provided at the tips of these protruding frames.

[0025] In the embodiments 1 and 2 described later, a column (14) is attached inside the protruding frame (142) for fitting and aligning with an opposing model corresponding to the three-dimensional shape of the three-dimensional molded part 11. Furthermore, a fitting projection or fitting recess is provided at the tip of each column 14, allowing it to be fitted and fixed with a fitting recess or fitting projection provided on the corresponding opposing model.

[0026] In Embodiment 3, described later, the protruding frame (17) has a rectangular protruding shape in plan view, and the protruding shape itself forms a fitting projection. Then, a fitting projection 27 having a fitting recess inside is provided at the corresponding position of the opposing upper mold model (Figure 30).

[0027] Furthermore, corresponding to each protruding frame, the column body inside each, and the fitting projection at the end of each column of the aforementioned composite model, the opposing model has an opening frame formed in a symmetrical shape to the opening frame of the composite model, and the same number of protruding frames (142) are provided at multiple locations around the opening frame, with fitting recesses provided inside these protruding bodies.

[0028] The fitting projection or fitting recess at the tip of such a column (14) is fitted by the corresponding fitting recess or fitting projection, forming a combined fitting structure. One of these fitting structures is provided at a predetermined height within the protruding frame of a plurality of composite models, and the other fitting structure is provided in a common positional relationship with the opposing model corresponding to the composite model.

[0029] Each composite model in the embodiment and its corresponding opposing model can be combined by a correspondingly formed fitting structure. That is, each composite model (1) and the opposing model have an opening frame of the same or symmetrical shape, and the same number of protruding frames of the same shape and size are formed at specific positions around the opening frame. Fitting protrusions and fitting recesses are provided within each corresponding protruding frame for fitting the model models together. The combination of these fitting structures, consisting of fitting protrusions and fitting recesses, is provided corresponding to common positions, making it easy to confirm the upper and lower occlusion and the fixing position of each model.

[0030] (6) The thin skin of the three-dimensional molded part (11) of the thin skin cup model (100) is characterized in that a number of partial "support column rows 151, 152, 153, 154, 155" are erected in the internal space from the inner surface of the thin skin of the three-dimensional molded part (11) toward the internal space, intersecting each other and spaced apart within the internal space.

[0031] This row of support columns maintains resistance to deformation and surface shaping (minimizing the effects of hardening expansion). Furthermore, because the support columns are arranged vertically and horizontally in a three-dimensional truss-like intersection / columnar or beam-like configuration within the open interior space, gypsum can be easily filled without gaps, improving adhesion. Additionally, the combination of a cup of a certain thickness and the row of support columns makes it resistant to deformation and maintains its shape even with high-temperature, heavy-duty composite molding. The columns can be oriented vertically, horizontally, or diagonally. In particular, if oriented vertically, they must be perpendicular to the open surface.

[0032] The composite model of the embodiment described later consists of a "lower" model made of one of the aforementioned composite models, which is three-dimensionally molded and has a molded surface for molding the lower surface of the denture base, and an "upper" model made of one of the aforementioned composite models, which is three-dimensionally molded and has a molded surface for molding the upper surface of the denture base, and the composite model is formed by combining the upper and lower models facing each other. Either the upper model or the lower model has an embedding hole (11D) on its molded surface for embedding the roots of the artificial teeth and clasp (bar) attachments that constitute the denture at a predetermined position and height, and the other of the upper and lower models has a mating and holding hole (11H) for mating and holding the tips of the artificial teeth (and clasp (bar) attachments).

[0033] Furthermore, as a method for attaching the artificial tooth and clasp (bar) attachment, either a method in which the tip of the artificial tooth (and clasp (bar) attachment) is held in the retaining hole and then composite molded, or a method in which the tip of the artificial tooth (and clasp (bar) attachment) is bonded to the retaining hole formed after composite molding and then composite molded, or a combination thereof, can be adopted.

[0034] In Embodiment 3, the opposing model is provided with an embedded pocket (2P) having an embedded hole (11D) for embedding at a position and height corresponding to the predetermined position and height (Figure 30). This opposing model is also made by three-dimensional molding using three-dimensional scanning (3D scanning).

[0035] (7) The polysynthetic model (1) of any of the dentures is characterized in that the material of the molded surface of the thin-layer cup model (100) is made of an ultraviolet curing resin mainly composed of an acrylic polymer agent (5-35% by weight, with surface roughness and surface tackiness of organophosphorus compounds).

[0036] (8) The present invention relates to a method for manufacturing dentures, which is a method for manufacturing dentures using any of the composite models described in (1) to (7) above, and is characterized by comprising the following steps in order. In other words, the process consists of: a three-dimensional measurement step of three-dimensionally measuring the three-dimensional shape of the denture mounting surface and its surrounding area in the oral cavity of the subject by three-dimensional scanning (3D scanning); a three-dimensional molding step of three-dimensionally molding a thin-shell cup model (100) having the three-dimensional shape based on the three-dimensional measurement on its molded surface with a constant thickness using a three-dimensional printer; and a filling and hardening step of filling the internal space of the thin-shell cup model (100) with dental plaster and hardening it to obtain any of the polysynthetic model described in (1) to (7); a mold setting step of three-dimensional measurement of the three-dimensional measurement of the denture mounting surface and its surrounding area in three-dimensional scanning (3D scanning); and a mold closing step of three-dimensionally molding a thin-shell cup model (100) having the three-dimensional shape based on the three-dimensional measurement on its molded surface by a three-dimensional scanning (3D scanning); and a filling and hardening step of three-dimensional measurement of the polysynthetic model molding process (A) consisting of: a release agent application step of three-dimensional measurement of the molded surface of the three-dimensional molded part (11) of the polysynthetic model; and a placement step of three-dimensional measurement of the obtained polysynthetic model in a polymer container that can be closed; and a mold closing step of three-dimensional measurement of the upper part of the polymer container to form a substantially sealed mold space containing the polysynthetic model. The present invention comprises the following steps: a main molding step (C) consisting of a polymerization treatment step in which molded resin is sandwiched (inserted), filled (injected), or built up in the space inside the mold and subjected to heat polymerization treatment; and a demolding step (D) consisting of a plaster removal step in which dental plaster is broken or cut and removed from the polymerized plaster mass demolded from the polymerization container after polymerization treatment, and a thin film removal step in which a thin film adhering to the surface of the molded resin after polycomposition molding is peeled off and removed to obtain a finished denture base made of molded resin; wherein in the demolding step (D), the molded surface of the resin is bent and deformed by folding, cutting, tearing, or severing the part of the polycomposition mold model other than the molded surface of the resin as described in any of (1) above, and a denture is obtained by demolding from the main molded resin.

[0037] (9) The mold setting step further comprises, after the release agent application step, an attachment placement step in which artificial teeth and accessories (at least one of clasps, rests, connectors, bars, metal bases, and attachments) to be attached to the finished denture base are pre-positioned on the polymerization molding model. Accessories refer to accessory parts that are integrally attached to the denture base or artificial teeth that constitute the denture, and include at least one of clasps, rests, connectors, bars, metal bases, and attachments.

[0038] (10) The mold setting step (B) further comprises a wax buildup step (b2) in which hot-melt wax (WX) is built up in a predetermined position on the polymerization model while being molded into the final mold shape, and artificial teeth (43) to be used as dentures are placed in the final mold position by trial fitting using upper and lower impression models on the hot-melt wax (WX), the final mold forming step (C) further comprises an upper mold filling step (b4) in which dental plaster is filled into the space above the built-up wax and artificial teeth and solidified to obtain an upper mold, the closing step (c1) of the final mold forming step (C) includes an internal mold space forming step in which the hot-melt wax is heated and melted and flows out of the mold through an outlet channel (501) formed in advance on the side of the mold to form an internal mold space (RS) in line with the final mold shape of the denture base, and as the dental plaster filled in by the upper mold filling step solidifies as the upper mold, the artificial teeth placed in the correct position adhere closely to the upper mold, In the closing step, the artificial tooth, which is held in the correct position within the embedded pocket (2P) of the upper mold, is held in that position in the upper part of the mold space, and in the polymerization step of the molding process (C), the molded resin that is sandwiched (inserted), filled (injected), or built up in the formed mold space is heated and polymerized integrally with the artificial tooth.

[0039] (11) As a method for manufacturing any of the dentures described above, the method includes a plaster removal step in which, during or before / after the thin-skin removal step of the demolding step, dental plaster that has been filled and solidified in the internal space of either the upper mold, the lower mold or the other thin-skin body in a closed state is removed in the order of one then the other, thereby demolding from the molded resin by bending the molded surface of the resin that is in close contact with the molded resin into a convex shape and causing elastic deformation.

[0040] By employing the above-described means, the present invention makes it possible to provide a polycomposite mold model that has high molding accuracy and surface density, and from which demolding of the finished molded resin after polycomposite molding is easy, as well as a method for manufacturing dentures that allows for easy demolding of the finished molded resin after polycomposite molding.

[0041] A perspective view of the thin-shell cup model (100) of Example 1. A perspective view of manufacturing state 1, obtained by inverting the perspective view of Figure 1 vertically. A cross-sectional view of X-X in Figure 2. A perspective view of the composite model in the composite model molding process (A) (filling and hardening step a) of Example 1. A cross-sectional view of X-X in the composite model molding process (A) (filling and hardening step a) and mold setting process (B) (attachment placement step b1) of Example 1. A cross-sectional view of X-X in the mold setting process (B) (wax build-up step b2) of Example 1. A cross-sectional view of X-X in the mold setting process (B) (upper mold filling step b4) of Example 1. A cross-sectional view of X-X in the main molding process (C) (closing step c1, polymerization step c2) of Example 1. A cross-sectional view of X-X in the demolding process (D) (demolition step d1) of Example 1. A cross-sectional view of X-X in the demolding process (D) (gypsum removal step d2) of Example 1. A cross-sectional view of X-X during the demolding process (D) (thin-layer removal step d3) of Example 1. A perspective view showing the back surface of the thin-layer cup model (100) of Example 2. A cross-sectional view of Y-Y of the thin-layer cup model (100) of Example 2 shown in Figure 12. A cross-sectional view of Y'-Y' of the composite model of Example 2 with dental gypsum filling the internal space. A plan view (a1) and a bottom view (a2) of the composite model (1) of Example 2. A cross-sectional view of the state after the artificial tooth placement step, where temporary molded wax WR etc. is placed on the composite model. A cross-sectional view of the state during the impression-taking step, when the corresponding upper mold is molded. A cross-sectional view of the state after the impression-taking step, when the upper mold silicone (2S') etc. is disassembled after molding. A cross-sectional view of the state before the closing step, when the upper mold silicone (2S') is closed. A cross-sectional view of the state during the closing step, when the upper mold silicone (2S') is closed. A cross-sectional view of the state during the molding resin filling step, when the molding resin RG is injected and filled. Cross-sectional view of the state during the polymerization step when the closed molded polypolymer model is polymerized. Cross-sectional view of the state during the demolding step when the upper mold silicone (2S') is removed. Cross-sectional view of the state after the demolding step when the main molded resin body (4) is demolded from the polypolymer model. Bottom view of the thin-shell cup model (100) of Example 3. Top view of the thin-shell cup model (100) of Example 3. Cross-sectional view of A-A in Figure 16. Cross-sectional view of the polypolymer model of the denture of Example 3 at the position corresponding to A-A. Bottom view of the polypolymer model of the denture of Example 3. Explanatory diagram of the state during the closing step of Example 3.

[0042] Hereinafter, the best mode for carrying out the present invention will be described together with the drawings shown as Examples 1 to 2.

[0043] In each embodiment, the polymerization molding model (1) of the denture according to the present invention is three-dimensionally shaped by a resin 3D printer, and the molding surface has a three-dimensional convex surface in the shape of a gum facing the denture base, and is three-dimensionally shaped as a three-dimensional molding part (11) composed of a thin skin body having a certain thickness along this molding surface. It is composed of a thin skin cup model (100) having an internal space that is open downward by a three-dimensional concave surface on the back side of the three-dimensional molding part (11) composed of the thin skin body, and dental plaster DP) filled and solidified in the internally open space of the thin skin cup model (100).

[0044] In this molding model for polymerization molding of a denture, after polymerization molding, ordinary plaster is broken and detached from the internal space, and the three-dimensional molding part (11) composed of a thin skin body is bent or folded (and then), the thin skin body of the thin skin cup model (100) It is characterized in that it is peeled off from the main molding resin body (4) (finished shape molding resin) after denture base molding and demolded.

[0045] The thin skin body of the thin skin cup model (100) is formed with a substantially constant thickness of more than 1.0 mm and less than 2.0 mm (best is 1.4 mm to 1.8 mm) and an error range of ±0.5 mm or less in the three-dimensional molding part (11) constituting the molding surface of the denture base. By setting it to more than 1.0 mm, it is possible to ensure more optimal molding accuracy and shape retention while being a thin skin body made of a general-purpose molding resin. Also, by setting it to less than 2.0 mm, it becomes easy to take out by breaking the thin skin body itself. That is, the upper limit value is the upper limit of the thickness for easier detachment, and is a numerical range that suppresses an increase in cost due to an excessive resin material. The lower limit value is a value for ensuring more molding accuracy and shape retention.

[0046] When the thin skin body is made of a resin material mainly composed of either AP resin or ABS resin, it is preferably set to a constant thickness of (more than 1 mm and less than 2 mm). In the embodiment, the "thin skin cup model (100)" has a constant thickness within 1.5 mm ± an error of 0.5 mm.

[0047] (Furthermore, it is preferable that a thickness variable part (ridge or groove) serving as a trigger for bending or pulling and tearing is provided in a part of an opening frame 12 continuous with the lower part of the three-dimensional molding part (11).) Also, in the molding method, in the demolding step of demolding by peeling from the molded resin body (4) (molding resin of the finished shape) after the polymerization, a splitting step of bending and deforming the thin-walled cup model (100) or folding and tearing or cutting and splitting it is included.

[0048] The dental plaster DP is preferably a low-expansion plaster with a hardening expansion rate of less than 0.1% (more specifically, 0.08% to 0.2%). If the expansion rate is high, cracks will occur during hardening. Since the plaster can be easily broken, the denture base will not be damaged by pliers.

[0049] The thin-walled body of the three-dimensional molding part (11) of the thin-walled cup model (100) is three-dimensionally printed with a colored resin that is different from both the color of dental plaster and the color of denture base resin. By using white dental plaster, when cutting the lower part of the plaster with pliers, it is easy to find and take out the embedded molding resin and the thin-walled cup model (100) from the buried mating plaster body.

[0050] By being molded with different colored resins, the thin-walled cup model (100) buried in the upper and lower mating plasters after polymerization is easy to find and take out.

[0051] It is preferable that the "thin-walled cup model (100)" is coated with a mold release agent on the model surface facing the special resin that becomes the denture resin. By applying the mold release agent, the demolding of the special resin shell after polymerization becomes easy.

[0052] In the internal space of the back surface, a number of partial "support column rows" intersect with each other and are erected spaced apart in the space.

[0053] The structure is resistant to deformation and maintains surface formability (less affected by hardening expansion). Furthermore, because the "support column rows" are erected in a three-dimensional truss-like intersection / columnar or beam-like arrangement in the open interior space, gypsum can be easily filled without gaps (voids), improving adhesion. In addition, by integrally molding a thin skin of a certain thickness and the support column rows formed in the open space inside using a 3D printer, it becomes resistant to deformation even with high-temperature heavy-duty molding, and shape retention is possible.

[0054] In each of the three figures from Figures 1 to 8, the upper and lower mold models are assembled facing each other to perform a composite molding process to form the denture base. This process involves a "lower mold" model consisting of one of the composite mold models described above, which is three-dimensionally molded and has a molded surface for forming the lower surface of the denture base, and an "upper mold" model consisting of one of the composite mold models described above, which is three-dimensionally molded and has a molded surface for forming the upper surface of the denture base. The composite mold can then be used to form the denture base in the manner shown in Figures 1 to 7, and the denture can be removed from the upper and lower molds after the composite molding process.

[0055] Figure 1 is a perspective view of the thin-shell cup model (100) (lower mold) and the corresponding occlusal model (upper mold) of Example 1. Figure 2 is a perspective view of the fabrication state 1, obtained by rotating the perspective view of Figure 1 vertically. Figure 3 is a cross-sectional view of X-X and X'-X' in Figure 2. Figure 4 is a perspective view of the composite model in the composite model molding process (A) (filling and curing step a) of Example 1. Figure 5 is a cross-sectional view of X-X in the composite model molding process (A) (filling and curing step a) and the mold setting process (B) (accessory placement step b1) of Example 1. Figure 6 is a cross-sectional view of X-X in the mold setting process (B) (wax build-up step b2) of Example 1. Figure 7 is a cross-sectional view of X-X in the mold setting process (B) (upper mold filling step b4) of Example 1. Figure 8 is a cross-sectional view of X-X in the main molding process (C) (closing step c1, polymerization step c2) of Example 1. Figure 9 is a cross-sectional view along X-X during the demolding process (D) (demolition step d1) of Example 1. Figure 10 is a cross-sectional view along X-X during the demolding process (D) (gypsum removal step d2) of Example 1. Figure 11 is a cross-sectional view along X-X during the demolding process (D) (thin layer removal step d3) of Example 1.

[0056] Figure 12 is a perspective view showing the back surface of the thin-shell cup model (100) of Example 2. Figure 13 is a Y-Y cross-sectional view of the thin-shell cup model (100) of Example 2 shown in Figure 12, and Figure 14 is a Y'-Y' cross-sectional view of the composite model of Example 2 with dental gypsum filled in the internal space. Figure 15 is a plan view (a1) and a bottom view (a2) of the composite model (1) of Example 2. Figure 16 is a cross-sectional view of the composite model of Example 2 after the artificial tooth placement step, with the temporary molded wax WR of the finished denture base, four artificial teeth, and clasp 4P placed above it. Figure 17 is a cross-sectional view during the impression-making step, in which the upper mold corresponding to the lower mold of the composite model including the temporary molded wax W, artificial teeth, and clasp 4P is molded from silicone resin (2S). Figure 18 is a cross-sectional view after the impression-taking step, showing the upper mold silicone (2S'), artificial tooth 43, and clasp 4P disassembled into temporary molded wax W and composite model. Figures 19 and 20 are cross-sectional views before and during the closing step, showing the artificial tooth 43 being temporarily fixed to the upper mold silicone (2S') and then closed onto the composite model. Figure 21 is a cross-sectional view during the resin filling step, where the molding resin RG is injected and filled into the molded space of the closed composite model. Figure 22 is a cross-sectional view during the polymerization step, where the closed composite model after resin filling is polymerized in a polymerization container. Figure 23 is a cross-sectional view during the demolding step, where the upper mold silicone (2S') is removed. Figure 24 is a cross-sectional view after the demolding step, where the final molded resin body (4) is demolded from the composite model.

[0057] Figures 25 and 26 are the bottom and top views of the thin-shell cup model (100) of Example 3. Figure 27 is a cross-sectional view taken along line A-A in Figure 16. Figure 28 is a cross-sectional view taken at the position corresponding to line A-A of the composite denture model of Example 3. Figure 29 is a bottom view of the composite denture model of Example 3. And Figure 30 is an explanatory diagram of the state during the closing step of Example 3.

[0058] The upper mold, which is closed in accordance with the composite mold model, preferably has retaining holes for temporarily fixing the artificial teeth 43 that constitute the denture in a predetermined position and height within the mold. It may also have retaining holes for temporarily fixing accessories such as clasps and bars within the mold. As shown in Figure 19, by performing composite molding with the tips of the artificial teeth (and clasp (bar) accessories) held in the retaining holes within the upper mold, the composite molding of the main molded resin body can be performed simultaneously with the fixation and integration of the artificial teeth and other components.

[0059] In Example 2, the upper mold 2S' has retaining holes for embedding at positions and heights corresponding to the predetermined positions and heights (Figures 18 and 19). In the figures, the upper parts of the four artificial teeth 43 are temporarily held in place at the embedding positions.

[0060] In Example 2, a model in which the clasp 4C is set in a fixed position on the heavy composite mold model before closing is also shown (Figure 19).

[0061] (Upper and lower occlusal alignment using interlocking posts) In addition to the above, one of the upper model and the lower model, and the other, may each have an interlocking post 14 for the combined alignment of the upper and lower models, and a corresponding interlocking receiving portion, on the outside of the lower frame (not shown).

[0062] It has high molding precision and surface density, and facilitates release from the molded resin (colored special resin) after polycomposition molding.

[0063] The molding resin material consists of an ultraviolet-curing resin with an acrylic polymer agent as the main component (e.g., 5-35% by weight). Surface coating with a primer is unnecessary, and the adhesion of the separating agent or mold release agent is good. After application, it forms a molded model of a thin skin with a surface layer of the separating agent or mold release agent without the need for a primer layer.

[0064] (Application of release agent to the surface) The molded surface is characterized by being composed of a release layer that is "highly safe for living organisms and easily removable (containing surfactants and general separating agents as the main components)" or by being composed of a pseudo-ABS resin layer on which a surfactant coating has been applied.

[0065] Although acrylic resins generally do not allow mold release agents to adhere to the surface, this pseudo-ABS resin layer has good compatibility with separating agents / surfactants.

[0066] This eliminates the need for the wax buildup process. It is unaffected by resin polymerization failures. The retention holes eliminate the risk of the denture falling out or shifting when the baseplate is removed.

[0067] (Method for manufacturing dentures) The method for manufacturing dentures of the present invention comprises: a measurement step of three-dimensionally measuring the three-dimensional shape of the denture mounting surface and its surrounding area in the oral cavity of a subject by 3D scanning; a three-dimensional molding step of three-dimensionally molding a thin-shell cup model (100) having the three-dimensional shape obtained by the 3D scanning with a constant thickness using a three-dimensional printer; a filling and hardening step of filling the internal space of the thin-shell cup model (100) with gypsum and hardening it to obtain a composite model; a release agent application step of applying a release agent to the molded surface of the thin-shell body; a closing step of joining the lower mold and upper mold of the thin-shell cup model (100) to form an internal mold space; and a polymerization treatment step of sandwiching or filling the internal mold space with molding resin and performing a heat polymerization treatment. The demolding process involves peeling and demolding the polymerized molded resin body (4) (molded resin in the finished shape) by bending and deforming the thin-skin cup model (100), or by breaking and tearing or fracturing it, thereby demolding it from the molded resin. The three-dimensional convex surface of the three-dimensional molded part (11) facing the underside of the denture base is characterized by being constructed from a three-dimensional model obtained by three-dimensional printing using a three-dimensional printer based on three-dimensional measurement.

[0068] Figures 12 and 13 are perspective views and Y-Y cross-sections of the thin-shell cup model (100) of Example 2 for molding the lower surface of the denture base, in an inverted state, with the internal space exposed on the upper side. Figures 14 and 15 are cross-sectional, plan, and bottom views of the YY position of the composite denture model (1) of Example 2, where dental plaster is filled into this internal space and solidified. Figures 16 to 24 are state diagrams of each step in the method for manufacturing a denture using the composite denture model of Example 2.

[0069] The denture of Example 2, as shown by the dashed line in Figure 12, consists of a molded resin body 4 that covers the entire inner surface of the oral cavity except for the central posterior part, four artificial teeth 43 integrally attached to the anterior teeth position of the denture base made of the molded resin body 4, and left and right clasps 4C integrally attached to both posterior ends of the denture base made of the molded resin body 4. The left and right clasps 4C are engaged with the innermost part of the remaining molars to fit the denture of Example 2.

[0070] In Figure 12, the central rear part of the opening frame (2) is filled in by an island-like mass (16), and in the remaining internal space, numerous small-diameter cylindrical rods appear arranged in the same pattern in the XYZ axes as support column rows 151, 152, and 153. In addition, the three-dimensional molded part (11) and the three-dimensional convex surface of the remaining teeth (11T), which are three-dimensionally printed by a 3D printer, appear below the opening frame 12.

[0071] In Figures 25 and 26, the rows of support columns 154 and 155, each having axial components in the X, Y, and Z directions and oriented in intersecting diagonal directions, appear at approximately equal intervals in a bottom view, as if one small-diameter cylindrical rod oriented diagonally upwards and one small-diameter cylindrical rod oriented diagonally downwards were fixed to each other at their intersections.

[0072] In Embodiment 2, protruding frames 142 are formed at three locations around the opening frame 12, projecting outward at the same frame height as the opening frame. Within the protruding frames 142, columnar recesses are formed, and a bottomed conical fitting recess 143 is formed at the center of the tip of each columnar recess.

[0073] The protruding frame 142 and the fitting recess 143 inside it are fixed by a fixing device (not shown) of a corresponding mold model having a corresponding column and fitting projection, or are adjusted by the teeth of a corresponding mold model (not shown).

[0074] The material of the molded surface of the thin-skin cup model (100) is preferably an ultraviolet-curing resin whose main component is an acrylic polymer agent (5-35% by weight of an acrylic polymer agent, with an organophosphorus compound as a minor component).

[0075] With this type of material, surface coating such as surfactants becomes unnecessary, and the model has a surface layer with good adhesion and bonding properties for separating agents or mold release agents. The wax coating process is eliminated, and the material is not affected by the polymerization failure of the resin.

[0076] The material of the molded surface of the thin film may consist of an ABS resin layer (example: surface roughness without primer) coated with a surfactant paint or medical petrolatum.

[0077] Example 1 consists of a thin-shell cup model (100) having a three-dimensional molded surface (11) which is an oral cavity model of one jaw of a subject with four anterior teeth remaining, and a heavy composite model (1) in which dental plaster is filled and solidified in the internal space of the cup model (100) of Example 1. In the internal space open on the lower surface of the thin-shell cup model (100), a short cylindrical space 160 for fitting and fixing a fixing magnet 16M is formed by a circular frame 16S. In the internal space excluding this short cylindrical space 160, support column rows 151, 152, and 153 extending in the X-axis, Y-axis, and Z-axis directions, respectively, are connected at their intersections, extending from the back surface of the thin-shell body of the three-dimensional molded surface (11) as their base and arranged in an intersecting pattern. In this temporary configuration, where accessories consisting of clasps and bars are placed on the three-dimensional molded surface (11) of the composite model, and molten wax (WX) is built up to position the artificial teeth 43 in their correct positions, the mating mold, which has been three-dimensionally molded as the opposing dentition, is tried on. In the temporary configuration after the try-on and inertia, the composite model is fixed in the polymerization container 2 using the magnetic attachment of the fixing magnet 16M at its bottom, and the upper mold is formed by pouring dental plaster 2DP into the polymerization container and solidifying it into solidified plaster 2DP' (see Figures 7-8).

[0078] Specifically, wax is applied to the mold model to create a temporary denture base shape, multiple dentures are attached to the temporary wax in the correct occlusal position, and the upper part of the lower mold model, on which the wax is applied and the dentures are attached, is covered with dental plaster to form a female mold in a predetermined box shape.

[0079] Each of the opposing upper and lower mold models has a fitting column 14 extending toward the other and a corresponding fitting receiving portion integrally attached to multiple locations on the outer circumference of the open end of each thin-shell cup model (100). By fitting the corresponding fitting column 14 and fitting receiving portion, the upper and lower mold models are closed in the correct combination position of the upper and lower molds.

[0080] (Application of mold release agent to the surface) The molded surface is characterized by being composed of a mold release layer that is "highly safe for living organisms and easily removable (containing surfactants / general separating agents as the main component)" or by being composed of a pseudo-ABS resin layer on which a surfactant coating has been applied. Acrylic resin does not allow general mold release agents to adhere to the surface, but this pseudo-ABS resin layer has good compatibility with separating agents / surfactants. In other words, it is a manufacturing method in which a mold release solution such as a separating agent or mold release agent is applied in layers.

[0081] Furthermore, the mold release agent application step may involve applying multiple layers of a mold release solution, such as a separating agent or mold release agent, in a series of coats.

[0082] <Effects and Benefits> ・Three-dimensional printing of resin allows for the low-cost production of male mold models with high temperature resistance and high-precision surface texture. ・Internal support column rows (several patterns are shown as examples) facilitate the filling of ordinary gypsum, and the removal of gypsum after hardening is also easy. ・Due to the thin molding thickness of 1.0 to 2.0 mm, it has excellent fracture resistance and superior demolding and removal properties compared to internally filled 3D molding. (Purpose and Effects of the Invention)

[0083] (Basic configuration of the composite model (1) of dentures) The composite model (1) of dentures of the present invention is formed by three-dimensional printing of an elastic resin, and the molded surface for composite molding dentures has a three-dimensional shape with a convex surface that is made up of the gum shape of the denture wearer and the shape of the remaining teeth 11T if there are remaining teeth, and is formed as a three-dimensional molded part (11) made of a thin skin of a certain thickness along this molded surface, and has an internal space that is open at the bottom due to the three-dimensional concave surface on the back side of the three-dimensional molded part (11) made of a thin skin, and is composed of a thin skin cup model (100) which is open at the bottom due to the three-dimensional concave surface on the back side of the three-dimensional molded part (11) made of a thin skin, and dental gypsum (1DP') which is filled into the open internal space of the thin skin cup model (100) and solidified.

[0084] The three-dimensional convex surface of the three-dimensional molded portion (11) has a three-dimensional shape that includes a portion facing the denture base. This three-dimensional shape consists of the gingival shape and the shape of the remaining teeth if there are remaining teeth in the oral cavity of the wearer's jaw to be fitted, and consists only of the gingival shape if there are no remaining teeth.

[0085] Furthermore, the three-dimensional shape of the three-dimensional convex surface of the three-dimensional molded part (11) consists of a three-dimensional molded model obtained by first acquiring three-dimensional point cloud data of the three-dimensional shape of the denture mounting surface and its surroundings inside the mouth of the denture wearer using a three-dimensional shape measurement (3D scanning) device (three-dimensional measurement step), and then converting this point cloud data into element group data (mesh data (polygon data), surface data (geometry data)) of a three-dimensional CAD model and then three-dimensionally molding it using a three-dimensional printer (three-dimensional molding step).

[0086] After performing the heavy synthesis molding process using the heavy synthesis model (1) of the denture, the molded resin is in close contact with the three-dimensional convex surface of the three-dimensional molded part (11) made of a thin skin. The dental plaster (1DP') that has solidified at the bottom of the heavy synthesis model (1) can be broken and detached from the internal space, allowing the three-dimensional molded part (11) made of a thin skin to be bent or folded and deformed. At the same time, the thin skin of the thin-skin cup model (100) can be peeled off from the molded polymerized main molded resin body (molded resin in the finished shape) and demolded.

[0087] (Demolding Process) The three-dimensional convex surface of the molded surface of the resin having the three-dimensional molded shape can be removed by destroying a part of the internal structure other than the molded surface of the resin after polypolymerization, or by cutting, cleaving, bending, or folding a part of the surface structure other than the molded surface of the resin, and the thin skin of the thin skin cup model (100) can be peeled off and demolded from the polymerized main molded resin body (4) (molded resin with the finished shape) that has been molded as a denture base.

[0088] (Resin Color) It is preferable that the three-dimensional molded part (11), which consists of a thin film, is molded with a colored resin that is different in color from both the gypsum color of dental gypsum and the molded resin color of the denture base, so that the presence of the three-dimensional molded part (11) can be recognized by color during the demolding process from the main molded resin body (4). When the three-dimensional molded part (11) embedded in the gypsum is recognized by color during demolding, it becomes less likely to damage the main molded resin body (4).

[0089] (Opening frame and column) The thin-shell cup model (100) has an internal space that is open to the back side in a predetermined opening shape, and an opening frame (12) of a certain height is formed around the circumferential direction of the open end, and column bodies (14) that extend in the height direction (vertical direction) of the three-dimensional molded part are attached to multiple locations around this opening frame (12) to be fixed in a predetermined fixed position or fixed orientation.

[0090] Each column (14) has a rotating part with a fitting projection 141 or recess at the center of its tip. By fitting it into the corresponding fitting recess or projection, all the combined columns can be held and fixed in a substantially vertical direction at the fixed position. Furthermore, by using opposing molds with corresponding fitting recesses or projections at corresponding positions around the frame, it can also be used to check the interlocking model of the upper and lower molds and for trial fitting adjustments. In addition, by attaching it around the opening frame (12), the three-dimensional molded part can be easily elastically deformed by holding the column (14) and bending it so that the column direction is tilted during demolding (see Figure 11).

[0091] (Support column rows) In the thin-shell cup model (100), partial support column rows (151, 152, 153) consisting of many thin columns are erected in the internal space on the back surface of the three-dimensional molded body (11), intersecting each other and spaced apart within the internal space. This helps to fill the entire internal space of the dental gypsum 1DP', reducing the air bubble content, and reinforces the filling area of ​​the dental gypsum 1DP' in a truss-like manner. Furthermore, it is preferable that these support column rows consist of a combination of multiple column rows from vertical column rows 151, horizontal column rows 152, and height-direction column rows 153, as in Example 1, or a combination of column rows of a first diagonal direction 154 and a second diagonal direction 155, as in Example 2.

[0092] In Example 1, the vertical column row 151, the horizontal column row 152, and the height column row 153 each consist of small-diameter cylindrical bodies. In each row, they are arranged at equal intervals from one another in the X, Y, and Z axes of the three-dimensional CAD model, and extend in each axis direction with the back surface of the three-dimensional molded body as the column base. The height column row has end faces of approximately the same height, with a virtual surface parallel to the open lower surface of the internal space as its tip.

[0093] The present invention provides a method for manufacturing dentures, comprising, in order, the following steps: a composite model molding step (A), a setting step (B), a final molding step (C), and a demolding step (D).

[0094] The composite model molding process (A) consists of: "a three-dimensional measurement step of three-dimensionally measuring the denture mounting surface and surrounding three-dimensional shape of the subject's oral cavity using a three-dimensional shape measuring (3D scanning) device; a three-dimensional molding step of three-dimensionally molding a thin-shell cup model (100) having a three-dimensional shape (including a three-dimensional convex surface) on its molded surface based on the three-dimensional measurement, using a three-dimensional printer to a constant thickness; and a filling and hardening step of filling the internal space of the thin-shell cup model (100) with dental plaster and hardening it to obtain the composite model (1) of the present invention."

[0095] The setting process (B) consists of "an artificial tooth placement step in which all necessary artificial teeth are placed in the appropriate positions on top of the obtained composite model via the molding resin of the finished denture base, and a mold release agent application step in which a mold release agent is applied to the molded surface of the composite model."

[0096] This molding process (C) consists of "a mold closing step in which the upper part of the polycomposite model is closed to form a substantially sealed mold space containing the polycomposite model, and a polymerization treatment step in which molding resin is sandwiched (inserted), filled (injected), or built up in the mold space and subjected to heat polymerization treatment."

[0097] The demolding process (D) comprises the following steps: "a plaster removal step in which the dental plaster is broken or cut and removed from the polymerized plaster mass demolded from the polymerization container after the polymerization treatment, and a thin film removal step in which the thin film adhering to the surface of the molded resin after polypolymerization is peeled off and removed to obtain a finished denture base made of molded resin."

[0098] In the demolding step (D) described above, the molded surface of the resin is bent and deformed by folding, cutting, tearing, or breaking the part of the resin other than the molded surface of the heavy composite model described in any of (1) to above, and a denture is obtained by demolding from the molded resin body (4) (molded resin with the finished shape).

[0099] The mold setting process further comprises, after the release agent application step, an accessory placement step in which accessories to be attached to the finished denture base (at least one of clasps, rests, connectors, bars, metal bases, and attachments) are pre-positioned on the polymerization molding model.

[0100] (Securing the upper mold and artificial teeth in close contact) The mold setting step (B) further includes a wax buildup step (b2) in which hot-melt wax (WX) is built up in a predetermined position on the polymerization model while being molded into the final molded shape, and artificial teeth (43) to be used as dentures are placed on the hot-melt wax (WX) by trial fitting using upper and lower mold impression models and positioned in the final molded position, The final molding step (C) further includes an upper mold setting step (b4) in which dental plaster is filled into the space above the built-up wax and artificial teeth, or an upper mold resin (such as silicone resin) is closed and solidified to bring the upper mold into a closed state, The closing step (c1) of the final molding step (C) includes an internal mold space formation step in which the hot-melt wax is heated and melted and flows out of the mold through an outlet channel (501) formed in advance on the side of the mold, or the upper and lower molds are separated and the wax is removed to form an internal mold space (RS) in line with the final molded shape of the denture base, In the upper mold setting step, the filled dental plaster or upper mold resin solidifies as the upper mold, causing the artificial tooth positioned in the correct position to adhere closely to the upper mold. In the closing step, the artificial tooth held in the correct position by the upper mold is held in that adherent position in the upper part of the mold space. In the polymerization step of the molding process (C), the molded resin sandwiched (inserted), filled (injected), or built up in the formed mold space is heated and polymerized integrally with the artificial tooth.

[0101] The demolding process includes a plaster removal step in which the dental plaster that has been filled and solidified in the internal space of each thin layer of the upper or lower mold in a closed state is removed during or before / after the thin layer removal step of the demolding process, thereby demolding from the molded resin body (4) (molded resin in the finished shape) in the polysynthetic model (1) of the denture described in claim 1 by bending the molded surface of the resin that is in close contact with the molded resin into a convex shape and elastically deforming it.

[0102] Heavy composite model 1 Thin-shell cup model 100 Remaining tooth model 11T Opening frame 12 Thickness 12T Opening frame 12 Fitting column 14, 24 Internal molded body 16, 26 Inner frame 162 Inner frame space 160 Fixed metal 16M Thin-shell cup model (100) (Upper mold model) 2 Support column row 151, 152, 251, 252 Upper mold resin (silicone resin) 2S Main molded resin body 4 Artificial tooth 43 Clasp (accessory) 4C Bar plate (accessory) 4P Outlet duct 501, 201 Polymerization container (lower polymerization frame) 5, 7 Upper polymerization frame (polymerization lid) 6, 72 Molded resin RG Mold internal space RS Heat-melting wax WX Dental plaster 1DP, 1DP', 2DP, 2DP' Forceps KT Release Agent PR Heavy Synthesis Model Molding Process A Three-dimensional measurement step, three-dimensional molding step, filling and curing step a2, mold setting process B Release agent application step, accessory placement step b1 Artificial tooth placement step b2, c11 Wax build-up step b2 Upper mold setting step b4 Main molding process C Closing step (mold space formation step) c1, Closing step c21 Polymerization treatment step c2, c22 Demolding process D Plaster removal step d2, d3 Thin layer removal step d3

Claims

1. A molded model for composite denture molding, comprising: a thin-skin cup model formed by three-dimensional printing of elastic resin, wherein the molded surface has a three-dimensional convex surface in the shape of a gingiva, including a portion facing the denture base, and is formed as a three-dimensional molded part consisting of a thin skin of a certain thickness along this molded surface, and has an internal space that is open at the bottom due to a three-dimensional concave surface on the back side of the three-dimensional molded part consisting of a thin skin; and dental gypsum that has been filled and solidified into the internal space that is open at the bottom of the thin-skin cup model, wherein after composite molding, the dental gypsum is destroyed and detached from the internal space, the three-dimensional molded part consisting of a thin skin is bent or folded and deformed, and the thin skin of the thin-skin cup model is peeled off from the molded polymerized resin body to demold.

2. The thin skin of the thin skin cup model is formed in the three-dimensional molded portion that constitutes the molded surface of the denture base with a substantially constant thickness of 1.0 mm to 3.0 mm and an error range of ±0.5 mm or less, as described in claim 1.

3. The polycomposite model according to claim 1, wherein, after polycomposite molding, the molded surface of the resin having the three-dimensional molded shape can be destroyed and removed by destroying a part of the internal structure other than the molded surface of the resin, or a part of the surface structure other than the molded surface of the resin can be cut, cleaved, bent, or folded and deformed, and the thin skin of the thin skin cup model can be peeled off and demolded from the polymerized molded resin body formed into a denture base.

4. The polysynthetic model according to claim 1, characterized in that the three-dimensional molded part, which consists of a thin skin, is molded with a colored resin that is different in color from both the gypsum color and the color of the molded resin of the denture base.

5. The heavy composite model according to claim 1, characterized in that the thin-shell cup model has an internal space that is open to the back side in a predetermined opening shape, and an opening frame of a certain height is formed around the circumferential direction of the open end, and columnar bodies are attached at multiple locations around this opening frame for aligning to predetermined fixed positions or fixed orientations.

6. The composite model of a denture according to claim 1, characterized in that a number of partial support column rows are erected in the internal space of the thin-shell cup model, intersecting each other and spaced apart within the internal space.

7. The polysynthetic model of a denture according to claim 1, characterized in that the material of the molded surface of the thin-shell cup model is made of an ultraviolet-curing resin mainly composed of an acrylic polymer agent.

8. A composite model molding process comprising: a three-dimensional measurement step of three-dimensionally measuring the three-dimensional shape of the denture mounting surface and its surrounding area in the oral cavity of the subject by three-dimensional scanning; a three-dimensional molding step of three-dimensionally molding a thin-shell cup model having the three-dimensional shape based on the three-dimensional measurement on its molded surface with a constant thickness using a three-dimensional printer; and a filling and hardening step of filling the internal space of the thin-shell cup model with dental gypsum and hardening it to obtain a composite model according to any one of claims 1 to 7; a setting step comprising: an artificial tooth placement step of placing all necessary artificial teeth in appropriate positions on top of the obtained composite model via the molding resin of the finished denture base; and a release agent application step of applying a release agent to the molded surface of the composite model; a final molding process comprising: a closing step of closing the upper part of the composite model to form a substantially sealed mold space including the composite model; and a polymerization treatment step of sandwiching (inserting), filling (injecting), or building up molding resin in the mold space and performing a heat polymerization treatment; and A method for making dentures comprising the steps of: "a plaster removal step of removing dental plaster from a polymerized plaster mass demolded from a polymerization container after polymerization treatment by breaking or cutting the dental plaster; and a thin film removal step of peeling off and removing a thin film adhering to the surface of the molded resin after polycomposite molding to obtain a finished denture base made of molded resin," wherein in the demolding step, the molded surface of the resin is bent and deformed by bending, cutting, tearing, or rupturing a portion of the resin other than the molded surface of the polycomposite molded model according to any one of claims 1 to 7, and a denture is obtained by demolding from the molded resin.

9. The method for manufacturing a denture according to claim 8, further comprising, in the mold setting step, an accessory placement step of pre-positioning accessories to be attached to the finished denture base at predetermined positions on the polymerization molding model after the release agent application step.

10. The mold setting step further comprises a wax buildup step (b2) in which hot-molded wax is built up in a predetermined position on a polymerization model while being molded into the final molded shape, and artificial teeth to be used as dentures are placed in the final molded position by trial fitting using upper and lower impression models on the hot-molded wax, the final mold setting step further comprises an upper mold setting step (b4) in which dental plaster is filled into the space above the built-up wax and artificial teeth, or the upper mold resin is closed and solidified to create a closed upper mold, the closing step of the final mold setting step includes a mold space formation step in which the hot-molded wax is heated and melted and flows out of the mold through an outlet channel previously formed on the side of the mold, or the upper and lower molds are separated and the wax is removed to form an internal mold space that conforms to the final molded shape of the denture base, and as the dental plaster or upper mold resin filled in by the upper mold setting step solidifies as the upper mold, the artificial teeth placed in the correct position adhere closely to the upper mold. The method for manufacturing a denture according to claim 9, wherein in the closing step, an artificial tooth in its normal position, held by the upper mold, is held in the upper part of the mold space while maintaining that tight contact position, and in the polymerization step of the molding process, the molded resin sandwiched, filled, or built up in the formed mold space is heat-polymerized integrally with the artificial tooth.

11. The method for manufacturing a denture according to claim 9, characterized in that, during or before / after the thin-skin removal step of the demolding process, the method includes a plaster removal step of removing the dental plaster that has been filled and solidified in the internal space of each thin-skin body of the upper or lower mold in a closed state, thereby causing the molded surface of the resin that is in close contact with the molded resin to be bent into a convex shape and elastically deformed, thereby demolding from the molded resin in the heavy composite model of the denture according to claim 1.

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