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

Abstract

This invention provides a polycomposite mold model and method that offer high molding accuracy and surface density, and facilitate easy removal of the molded resin after polycomposite molding, at a relatively low cost. [Solution] The molded model for the composite molding of dentures consists of a thin-skin cup model having an open internal space on the back of a three-dimensional molded part made of a thin skin of a certain thickness, and dental gypsum that is filled into the open internal space of the thin-skin cup model and solidified. After composite molding, the solidified dental gypsum is broken and detached from the internal space, the three-dimensional molded part made of the thin skin is bent or folded and deformed, and the thin skin of the three-dimensional molded part is peeled off from the polymerized main molded resin body formed by the denture base and demolded.

Description

Technical Field

[0001] The present invention relates to a polymerization molding model for a denture (false tooth) used in the polymerization molding of a denture, and a method for manufacturing a denture using the same. The denture is composed of a denture base made of a molding resin and artificial teeth attached thereto. The polymerization molding model of the present invention particularly relates to a molding model for polymerizing a three-dimensional molding surface on one side (front or back surface side) of the denture base among the dentures. Further, the method for manufacturing a denture of the present invention is a polymerization molding using the polymerization molding model of the denture

Background Art

[0002] Regarding the polymerization curing and adhesion treatment of conventional dentures, for example, a method of taking out a denture through the following steps (A) to (D) is disclosed (hereinafter, described in Patent Document 1).

[0003] '(A) Take an impression of one dental arch of a patient and make a plaster model in a flask. Place a sheet of an olefin-based thermoplastic elastomer on the mucosal surface of this model and apply hot air to heat and soften it to form a rubber elastic material layer that conforms to the shape of the mucosal surface of the model. (B) Place an olefin-based room-temperature plasticizable material on the rubber elastic material layer, extend it to a desired shape and thickness, and form a room-temperature plasticizable material layer. It is necessary for the rubber elastic material layer to appear at the periphery of the room-temperature plasticizable material layer. (C) Apply an adhesive to the surface of the room-temperature plasticizable material layer and the surface of the rubber elastic material layer and dry it. This adhesive must be applied at least to the surface of the rubber elastic material layer and the surface of the partition that appear at the periphery of the room-temperature plasticizable material layer. Sandwich a disc-shaped PMMA resin between the pre-formed plaster mold in the flask for its restoration and the above model and compress and mold it. (D) Subsequently, the pair of flasks, stacked on top of each other, are placed in a vortex or steam chamber at approximately 100°C to 120°C to polymerize and harden the PMMA resin, forming the denture base. Simultaneously, 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] Furthermore, a conventional method for manufacturing dentures and denture mucosal bases has been disclosed that includes a step of creating upper and lower divisible parts (Patent Document 2). The same document describes the steps up to removing the denture as follows.

[0005] "After the wax denture is made and tried on by the patient as needed, and fine adjustments are made, the wax denture is placed in a flask to create an upper and lower split mold. ...Next, the split mold is heated to remove the wax that has been applied to the denture mucosal base, and then resin is filled into the space created by removing the wax, that is, the space created between the denture mucosal base and the artificial teeth. After the resin is cured by polymerization, the molded denture is removed from the split mold." (Paragraphs 0029, 0030)

[0006] In addition, a method has been disclosed to provide an integrated denture with a retention device and 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, "3D data of a denture in which the retention device and denture base are integrated is created using CAD, then output with a 3D printer, and other parts are added as needed to complete the denture." [Prior art documents] [Patent Documents]

[0007] [Patent Document 1] Japanese Patent Application Publication No. 01-94850 [Patent Document 2] Japanese Patent Publication No. 2008-119210 [Patent Document 3] Japanese Patent Publication No. 2019-141553 [Disclosure of the Invention] [Problems that the invention aims to solve]

[0008] However, when conventional plaster molds or separation molds are used for three-dimensional molding with a 3D printer, the resulting three-dimensional molded body has high molding accuracy and surface density, but it becomes difficult to detach it from the denture base after the composite molding process. In other words, when a three-dimensional molded body produced by a 3D printer is used as a mold for composite molding, the resin of the denture base, which is the molding resin after the composite molding process, adheres to the molded surface of the three-dimensional molded body, resulting in a problem where the demolding process to separate the resin of the denture base requires time and skill.

[0009] In particular, if the molded body contains undercuts, it becomes difficult to remove the mold. Furthermore, using special equipment or special resins for demolding becomes expensive.

[0010] Therefore, the object of the present invention is 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. [Means for solving the problem]

[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 polysynthetic model (1) of the denture according to the present invention is A resin molded surface, obtained by 3D printing, has a three-dimensional molded shape, and the molded surface of the resin has a three-dimensional convex surface in the shape of the gums facing the denture base, and is formed as a three-dimensional molded part (11) consisting of a thin membrane of a certain thickness along this molded surface, and the thin membrane cup model (100) 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 the thin membrane, Dental plaster (1DP') that has been filled and solidified in the open inner space of the thin-shell cup model (100), It is characterized by being composed of the following.

[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, The thin skin of the thin-skin cup model (100) is characterized in that it 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 consistent 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 be 1.4 mm or more and less than 2.0 mm is preferable in terms of achieving both easy demolding handling and strength. If it is less than 2.0 mm, it is the upper limit of the thickness that is easy to break and take out, and it is possible to suppress the increase in cost due to the excessive resin material.

[0018] The "thin - skin cup model (100)" has an internal space with an open back surface on the back side of the three - dimensional molding part 11. Dental plaster 1DP is filled into this internal space and solidified to become 1DP', thereby forming the "polymerization molding model (1)" of the denture.

[0019] Also, when the thin - skin body of the three - dimensional molding part (11) in the "thin - skin cup model (100)" and the "polymerization molding model" is made of a resin material mainly composed of either AP resin or ABS resin, it is preferably set to a certain thickness of more than 1.0 mm and less than 2.0 mm. For example, the "thin - skin cup model (100)" and the "thin - skin body of the three - dimensional molding part (11)" in the following examples consist of a substantially constant reference thickness of 1.5 mm ± 0.5 mm and the sum of its error thicknesses.

[0020] (3) In the polymerization molding model (1) of any of the above - mentioned dentures, Among the molding surfaces of the resin having the three - dimensional molding shape in the molding model for polymerization of the denture, after polymerization molding, a part of the internal structure other than the molding surface of the resin is destroyed and excluded, or a part of the surface structure other than the molding surface of the resin is cut, severed, bent, or folded, and at the same time, the thin - skin body of the three - dimensional molding part (11) can be peeled off from the finally - formed resin body (4) (finished - shape molding resin) after the denture base is molded and polymerized for demolding. This is the characteristic.

[0021] (4) In the polymerization molding model (1) of any of the above - mentioned dentures, The thin - skin body of the three - dimensional molding part (11) is molded with a colored resin having a color different from both the color of the gypsum and the color of the denture base resin. This is the characteristic.

[0022] After coincidence, the thin skin of the three-dimensional molding part (11) buried in the upper and lower plaster for alignment becomes visible or easy to recognize. That is, while the dental plaster DP is a natural color of the white system, when cutting the dental plaster DP' filled and solidified in the internal space with pliers, the molding material of the thin skin of the three-dimensional molding part (11) of the colored resin appears first from the plaster body for alignment in the buried state, so that the position of the denture base which is the buried molding resin can be grasped, and it becomes easy to take out without damaging the denture base.

[0023] In addition, in the method for creating a denture, a release agent application step of applying a release agent to the surface of the "thin skin cup model (100)" and the facing surface with the molding resin of the denture base is performed. By performing the release agent application, the demolding of the special resin shell after polymerization becomes easy.

[0024] (5) In the polymerization molding model (1) of any of the above dentures, The thin skin of the three-dimensional molding part (11) has an internal space with a predetermined opening shape and is open to the back side, and at the open end thereof, an opening frame (12) of a certain height is formed over the circumferential direction, and protruding frames (142, 17) are provided at a plurality of locations around this opening frame, and a fitting convex part or a fitting concave part is provided at the tip of this protruding frame.

[0025] In Examples 1 and 2 described later, a column body (14) for trial fitting and alignment with a counter-type model corresponding to the three-dimensional shape of the three-dimensional molding part 11 is attached inside the protruding frame (142), and further, a fitting convex part or a fitting concave part is provided at the tip of each column body 14, and it can be fitted and fixed with the fitting concave part or the fitting convex part provided on the corresponding counter-type model.

[0026] In Example 3 described later, the protruding frame (17) has a protruding shape that is rectangular in plan view, and the protruding shape itself forms a fitting convex part. And a fitting protruding part 27 having a fitting concave part inside is provided at the corresponding position of the opposing upper mold model (Fig. 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 projections or recesses at the ends of such columnar bodies (14) are fitted together by corresponding fitting recesses or projections, forming a combined fitting structure. One of these fitting structures is provided at a predetermined height within the protruding frames of multiple composite models, and the other fitting structure is provided in a common positional relationship with opposing models corresponding to the composite models.

[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 has 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 consistent thickness and the support column row 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] Furthermore, the composite model of the embodiment described later includes a "lower mold" model consisting of one of the above composite models, which is three-dimensionally molded and has a molded surface for shaping the lower surface of the denture base, The device consists of an "upper mold" model, which is three-dimensionally molded and has a molded surface for forming the upper surface of the denture base, and a composite model which is formed by combining the upper and lower mold 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 in a predetermined position and height. The other of the upper and lower models has a mating hole (11H) for mating and holding the tip of the artificial tooth (and clasp (bar) attachment).

[0033] Furthermore, as a method for attaching artificial teeth and clasp (bar) attachments, a composite method is used in which the tip of the artificial tooth (and clasp (bar) attachment) is held in the retaining hole. Alternatively, a method can be employed in which the tip of the artificial tooth (and clasp (bar) attachment) is bonded to a retaining hole formed after the composite molding is completed, and then the composite molding is performed while the tooth is still in place. This method can be either one or a combination thereof.

[0034] In Example 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 described above is characterized in that the material of the molded surface of the thin-skin body of the thin-skin 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: "A three-dimensional measurement step in which the three-dimensional shape of the denture mounting surface and its surrounding area in the subject's oral cavity is measured in three dimensions by a three-dimensional scan (3D scan)." A three-dimensional molding step is performed in which a thin-shell cup model (100) having a three-dimensional shape based on the three-dimensional measurement on its molded surface is three-dimensionally molded with a constant thickness using a three-dimensional printer. A composite model molding process (A) consists of a filling and hardening step, in which dental plaster is filled into the internal space of a thin-shell cup model (100) and hardened to obtain a composite model of any of the above (1) to (7). The mold setting process (B) consists of "a mold release agent application step of applying a mold release agent to the molded surface of the three-dimensional molded part (11) of the polysynthesis model, and a placement step of placing the obtained polysynthesis model in a closable polymerization container," "A closing step involves closing the top of the polymerization vessel to form a nearly sealed molded space containing the polypolymer model, This molding process (C) consists of 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, and Demolding process (D) consists of "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 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," It comprises each of the following processes: 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.

[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 attachment 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) In the mold setting step (B), a wax buildup step (b2) is further performed in which a heat-molded wax (WX) is built up at a predetermined position on the polymerization molding model while being molded into the final molded shape, and an artificial tooth (43) to be used as a denture is placed on the heat-molded wax (WX) by trial fitting using an upper and lower mold impression model. The molding process (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 allowed to solidify to obtain an upper mold. The molding process (C) includes a mold closing step (c1) in which a molten wax is heated and melted, and the resulting wax flows out of the mold through an outlet (501) pre-formed on the side of the mold, thereby forming an internal mold space (RS) that conforms to the molded shape of the denture base. In the aforementioned upper mold filling step, the filled dental plaster solidifies as the upper mold, causing the artificial teeth, positioned in the correct location, to adhere tightly to the upper mold. In the closing step, the artificial tooth in its normal position, held within the embedded pocket (2P) of the upper mold, is held in that position in the upper part of the mold space. Furthermore, in the polymerization step of the molding process (C) described above, the molded resin that has been 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 making any of the dentures described above, During or before / after the thin-layer removal step of the demolding process, the dental plaster that has been filled and solidified in the internal space of either the upper mold or the lower mold and the other thin-layer body in the closed state is removed in the order of one then the other. The polysynthetic model (1) of the denture described in claim 1 is characterized in that the molded surface of the resin that is in close contact with the molded resin is bent into a convex shape and elastically deformed to demold the molded resin. [Effects of the Invention]

[0040] By employing the above-described means, the present invention makes it possible to provide a composite mold model that has high molding accuracy and surface density, and from which the molded resin (molded resin) can be easily demolded after composite molding, as well as a method for manufacturing dentures that allows for easy demolding from the molded resin (molded resin) after composite molding. [Brief explanation of the drawing]

[0041] [Figure 1] Perspective view of the thin-shell cup model (100) of Example 1. [Figure 2] A perspective view of manufacturing state 1, obtained by inverting the perspective view of Figure 1 vertically. [Figure 3] Cross-sectional view of XX in Figure 2. [Figure 4] A perspective view of the polycomposite model in the polycomposite model molding process (A) (filling and curing step a) of Example 1. [Figure 5] Cross-sectional view of XX in the polycomposite model molding process (A) (filling and curing step a) and mold setting process (B) (attachment placement step b1) of Example 1. [Figure 6] Cross-sectional view of XX during the mold setting process (B) (wax buildup step b2) of Example 1. [Figure 7] Cross-sectional view of XX during the mold setting process (B) (upper mold filling step b4) of Example 1. [Figure 8] Cross-sectional view of XX in the main molding process (C) (closed mold step c1, polymerization treatment step c2) of Example 1. [Figure 9] Cross-sectional view of XX during the demolding process (D) (demolition step d1) of Example 1. [Figure 10] Cross-sectional view of XX during the demolding process (D) (gypsum removal step d2) of Example 1. [Figure 11] Cross-sectional view of XX during the demolding process (D) (thin skin removal step d3) of Example 1. [Figure 12] A perspective view showing the back surface of the thin-shell cup model (100) of Example 2. [Figure 13] Figure 12 shows a YY cross-sectional view of the thin-shell cup model (100) of Example 2. [Figure 14] Y'-Y' cross-section of the composite model of Example 2, in which dental gypsum is filled into the internal space. [Figure 15] Plan view (a1) and bottom view (a2) of the composite model (1) of Example 2. [Figure 16] Cross-sectional view of the state after the artificial tooth placement step, where temporary molded wax (WR) etc. is placed on a composite model. [Figure 17] A cross-sectional view of the state during the molding step when the corresponding upper mold is being molded. [Figure 18] Cross-sectional view of the state after the molding step, showing the upper mold silicone (2S'), etc., disassembled after molding. [Figure 19] Cross-sectional view of the state before the closing step when the upper silicon (2S') mold is closed. [Figure 20] Cross-sectional view of the state during the closing step when the upper silicon (2S') mold is closed. [Figure 21] Cross-sectional view of the state during the molding resin filling step, when molding resin RG is injected and filled. [Figure 22] Cross-sectional view of the state during the polymerization step in which a closed-type polysynthesis model is polymerized. [Figure 23] Cross-sectional view of the state during the demolding step after removing the upper silicone mold (2S'). [Figure 24] Cross-sectional view of the state after the demolding step, when the main molded resin body (4) is demolded from the heavy composite model. [Figure 25] Bottom view of the thin-shell cup model (100) of Example 3. [Figure 26] Plan view of the thin-shell cup model (100) of Example 3. [Figure 27] Cross-sectional view AA in Figure 16. [Figure 28] Cross-sectional view of the AA position of the composite denture model of Example 3. [Figure 29] Bottom view of the composite model of the denture according to Example 3. [Figure 30] Diagram illustrating the state during the closing step of Example 3. [Best Mode for Carrying Out the Invention]

[0042] The best mode for carrying out the present invention will be described below with reference to the figures shown as Examples 1 and 2.

[0043] In each embodiment, the polysynthetic model (1) of the denture according to the present invention is, The denture is constructed by three-dimensional printing of resin, forming a three-dimensional molded part (11) whose molded surface has a three-dimensional convex surface in the shape of a gingiva facing the denture base, and which consists of a thin membrane of a constant thickness along this molded surface, and a thin membrane cup model (100) having an open internal space on the back side of the three-dimensional molded part (11) made of a thin membrane, and dental gypsum (DP) which is filled and solidified in the open internal space of the thin membrane cup model (100).

[0044] In this molded model for composite denture, after composite molding, the plaster is normally destroyed and detached from the internal space, the three-dimensional molded part (11) consisting of a thin skin is bent or folded and deformed, and the thin skin of the thin skin cup model (100) is peeled off from the polymerized main molded resin body (4) (molded resin with the finished shape) that has been molded as the denture base and demolded.

[0045] The thin-skin cup model (100) is characterized in that the thin skin is formed in the three-dimensional molded part (11) that constitutes the molded surface of the denture base with a substantially constant thickness of more than 1.0 mm and less than 2.0 mm (ideally 1.4 mm to 1.8 mm), with an error range of ±0.5 mm or less. Setting the thickness to more than 1.0 mm ensures more optimal molding accuracy and shape retention, even though the thin skin is made of a general-purpose molded resin. Setting the thickness to less than 2.0 mm makes it easier to break and remove the thin skin itself. In other words, the upper limit is the upper limit of thickness for easier removal, and is a numerical range that suppresses the increase in costs due to excess resin material. The lower limit is a value to ensure better molding accuracy and shape retention.

[0046] Furthermore, if the thin film is made of a resin material mainly composed of either AP resin or ABS resin, it is preferable to set it to a constant thickness of (more than 1 mm but less than 2 mm). In the embodiment, the "thin film cup model (100)" has a constant thickness of 1.5 mm ± error of 0.5 mm or less.

[0047] (Furthermore, it is preferable that a thickness-variable portion (a protrusion or groove) that serves as a trigger for bending or pulling and tearing is provided in a part of the opening frame 12 connected to the lower part of the three-dimensional molded portion (11).) In the molding method, the demolding step, in which the polymerized molded resin body (4) (molded resin in the finished shape) is peeled off and demolded, includes a dividing step in which the thin-skin cup model (100) is bent and deformed, or broken and torn or cut and divided.

[0048] The aforementioned dental gypsum DP is preferably a low-expansion gypsum with a hardening expansion rate of less than 0.1% (more precisely, 0.08% to 0.2%). If the expansion rate is high, cracks will form during hardening. Because the gypsum can be easily broken, the denture base will not be damaged by forceps.

[0049] The thin skin of the three-dimensional molded part (11) of the thin-skin cup model (100) is molded in a 3D printer using a colored resin that is different in color from both the plaster color and the denture base resin color. By using white dental plaster, when the lower part of the plaster is broken with forceps, the embedded molded resin and the thin-skin cup model (100) are easier to find and remove from the embedded plaster body.

[0050] By molding with different colored resins, the thin-skin cup model (100) embedded in the upper and lower plaster layers after polymerization is easier to find and remove.

[0051] In the aforementioned "thin-shell cup model (100)," it is preferable that a release agent is applied to the model surface facing the special resin that will become the denture resin. Applying a release agent facilitates the demolding of the special resin shell after polymerization.

[0052] In the interior space on the reverse side, numerous partial "support column rows" are erected, intersecting each other and spaced apart within the space.

[0053] The structure is resistant to deformation and maintains surface moldability (less affected by hardening expansion). Furthermore, because the "support column rows" are erected in a three-dimensional truss 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 Figures 1 to 8, the "lower mold" model consists of one of the aforementioned composite models, which is three-dimensionally molded and has a molded surface for shaping the lower surface of the denture base, A "top" model, which is three-dimensionally molded and has a molding surface for shaping the upper surface of the denture base, is made up of one of the aforementioned composite mold models. By combining these upper and lower mold models facing each other, a composite mold is performed to shape the denture base in the manner shown in Figures 1 to 7, and the denture after composite molding can be removed from the upper and lower molds.

[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 fabrication state 1, obtained by inverting the perspective view of Figure 1 vertically. Figure 3 is a cross-sectional view of XX, 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 XX in the composite model molding process (A) (filling and curing step a) and mold setting process (B) (attachment placement step b1) of Example 1. Figure 6 is a cross-sectional view of XX in the mold setting process (B) (wax build-up step b2) of Example 1. Figure 7 is a cross-sectional view of XX in the mold setting process (B) (upper mold filling step b4) of Example 1. Figure 8 is a cross-sectional view of XX in the main molding process (C) (closing step c1, polymerization step c2) of Example 1. Figure 9 is a cross-sectional view of XX during the demolding process (D) (demolition step d1) of Example 1. Figure 10 is a cross-sectional view of XX during the demolding process (D) (gypsum removal step d2) of Example 1. Figure 11 is a cross-sectional view of XX 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 YY 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, and four artificial teeth and clasps 4P placed on top of the composite model. Figure 17 is a cross-sectional view during the impression-taking step, in which the upper mold corresponding to the lower mold of the composite model, including the temporary molded wax W, artificial teeth, and clasps 4P, was molded from silicone resin (2S). Figure 18 is a cross-sectional view after the impression-taking step, in which the upper mold silicone (2S'), artificial teeth 43, and clasps 4P are separated from the temporary molded wax W and composite model. Figures 19 and 20 are cross-sectional views of the state before and during the molding step, when the artificial tooth 43 is temporarily fixed to the upper silicone mold (2S') and molded onto the composite model. Figure 21 is a cross-sectional view during the molding resin filling step, when the molding resin RG is injected and filled into the molding space of the closed composite model. Figure 22 is a cross-sectional view during the polymerization step, when the closed composite model after molding resin filling is polymerized in a polymerization container. Figure 23 is a cross-sectional view during the demolding step, when the upper silicone mold (2S') is removed. Figure 24 is a cross-sectional view after the demolding step, when the main molded resin body (4) is demolded from the composite model.

[0057] Figures 25 and 26 are the bottom view and top view of the thin-shell cup model (100) of Example 3. Figure 27 is a cross-sectional view of AA in Figure 16. Figure 28 is a cross-sectional view of the AA-corresponding position 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 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, 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 clasp 4C is set in a fixed position on the heavy composite mold model before the mold is closed is also shown (Figure 19).

[0061] (Upper and lower occlusal alignment using interlocking posts) In addition to the above, one or the other of the upper and lower models may each have a fitting column 14 for aligning the upper and lower models together, and a corresponding fitting 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 aforementioned molded surface is characterized by being composed of a release layer that is "highly safe for living organisms and easily removable (containing a surfactant / general separating agent as the main component)" 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 of making dentures) In the method for manufacturing dentures of the present invention, A measurement step involves three-dimensionally measuring the three-dimensional shape of the denture mounting surface and its surrounding area within the subject's oral cavity using 3D scanning, A three-dimensional molding step is performed in which a thin-shell cup model (100) having a three-dimensional shape obtained by 3D scanning is three-dimensionally molded with a constant thickness using a three-dimensional printer, A filling and hardening step to obtain a composite model by filling the internal space of a thin-shell cup model (100) with plaster and hardening it, A mold release agent application step in which a mold release agent is applied to the molded surface of the thin film, A closing step in which the lower and upper molds of the thin-shell cup model (100) are joined together to form the internal mold space, A polymerization treatment step in which molding resin is sandwiched or filled into the space inside the mold and subjected to 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 it, thereby demolding it from the molded resin. The denture base is characterized in that the three-dimensional convex surface of the three-dimensional molded part (11) facing the underside of the denture base is 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 YY 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 of 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 were three-dimensionally printed by a 3D printer, appear below the opening frame 12.

[0071] In Figures 25 and 26, the support column rows 154 and 155, each having axial components in the X, Y, and Z directions and intersecting each other at an oblique angle, 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 mainly composed of an acrylic polymer agent (5-35% by weight of the 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) of an oral cavity model of one jaw of a subject with four anterior teeth remaining, and a 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, 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 gypsum 2DP into the polymerization container and solidifying it into solidified gypsum 2DP' (see Figures 7-8).

[0078] Specifically, wax is applied to the aforementioned mold model to create a temporary denture base shape, Multiple dentures are attached to the pre-formed wax in the correct occlusal position. The upper part of the lower mold model, to which wax has been applied and the denture has been attached, is covered with dental plaster to form a female mold in the 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 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 / 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 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 release solution such as a separating agent or 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.

[0082] <Effects and Effects> • By using a 3D printer to create resin models, male molds with high temperature resistance and high-precision surface texture can be obtained at low cost. • The internal support column rows (several patterns are shown as examples) facilitate the filling of ordinary plaster, and the removal of the plaster after hardening is also easy. Due to its thin molding process with a thickness of 1.0 to 2.0 mm, it offers excellent fracture resistance and superior demolding and removal capabilities compared to internally filled 3D molding. (Purpose and effects of the invention)

[0083] (Basic structure of the composite denture model (1)) The composite denture model (1) of the present invention is formed by three-dimensional printing of elastic resin, and the molded surface for composite denture formation has a three-dimensional convex surface that has a three-dimensional shape consisting of the gum shape of the denture wearer and the shape of the remaining teeth 11T if remaining teeth are present, and is formed as a three-dimensional molded part (11) consisting of a thin skin of a certain thickness along this molded surface, and a thin-skin cup model (100) having an open internal space on the back side of the three-dimensional molded part (11) consisting of a thin skin, It consists of dental plaster (1DP') that has been filled and solidified in the open internal space of the thin-shell cup model (100).

[0084] The three-dimensional convex surface of the three-dimensional molded portion (11) consists of a three-dimensional shape including 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 which the denture is to be worn, 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 in the oral cavity 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, which is then three-dimensionally molded (three-dimensional molding step) using a three-dimensional printer.

[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] (Demorphing process) The three-dimensional convex surface of the molded surface of the resin having the aforementioned three-dimensional molded shape can be partially destroyed and removed after polypolymerization, or partially cut, cleaved, bent, or folded to deform a portion 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 into a denture base.

[0088] (Resin color) Preferably, the three-dimensional molded part (11), which consists of a thin membrane, is molded from a colored resin that is different in color from both the gypsum color of the 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). If the three-dimensional molded part (11), which is embedded in the gypsum during demolding, can be recognized by color, the main molded resin body (4) will be less likely to be damaged.

[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 columnar bodies (14) that extend in the height direction (vertical direction) of the three-dimensional molded part are attached at multiple locations around this opening frame (12) to be fixed in predetermined fixed positions or fixed orientations.

[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 array) In the thin-shell cup model (100), a partial support column row (151, 152, 153) consisting of numerous thin columns is 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 this support column row consists of a combination of multiple column rows from vertical column row 151, horizontal column row 152, and height-direction column row 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 relates to a method for manufacturing dentures, comprising the following steps: a composite model molding step (A), type The process comprises, in order, a setting process (B), a main molding process (C), and a demolding process (D).

[0094] The heavy synthesis model molding process (A) is, "A three-dimensional measurement step in which the three-dimensional shape of the denture mounting surface and its surrounding area inside the subject's oral cavity is measured in three dimensions using a three-dimensional shape measuring (3D scanning) device, A three-dimensional molding step is performed by using a three-dimensional printer to create a three-dimensional model (100) with a constant thickness, which has a three-dimensional shape (including a three-dimensional convex surface) on its molded surface based on the three-dimensional measurement. The process consists of a "filling and hardening step" in which dental plaster is filled into the internal space of a thin-shell cup model (100) and hardened to obtain the polysynthetic model (1) of the present invention.

[0095] typeThe setting process (B) includes 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, The process consists of a "mold release agent application step," which involves applying a mold release agent to the molded surface of a heavy synthetic model.

[0096] This molding process (C) is "A closing step involves closing the top of the composite model to form a nearly sealed mold space containing the composite model, The process consists of a polymerization step in which molding resin is sandwiched (inserted), filled (injected), or built up in the space inside the mold and then subjected to heat polymerization treatment.

[0097] The demolding process (D) consists of "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." It comprises each of the following steps.

[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] (The upper mold and artificial tooth are tightly attached) In the mold setting step (B), molten wax (WX) is piled up at a predetermined position on the polymerization molding model while being molded into the final molded shape, and further comprising a wax buildup step (b2) in which artificial teeth (43) to be used as dentures are fitted to the final molded position on the molten wax (WX) using upper and lower impression models, The molding process (C) further comprises an upper mold setting step (b4) in which dental plaster is filled into the space above the built-up wax and artificial tooth, or an upper mold resin (such as silicone resin) is used to close and solidify the upper mold, thereby creating a closed upper mold state. The molding process (C) includes a mold closing step (c1) in which a mold space formation step is made by heating and melting a hot-melting wax and allowing it to flow out of the mold through an outlet passage (501) previously formed on the side of the mold, or by separating the upper and lower molds and removing the wax, thereby forming a mold space (RS) that conforms to the molded shape of the denture base. In the aforementioned upper mold setting step, the filled dental plaster or upper mold resin solidifies as the upper mold, causing the artificial teeth positioned in the correct positions to adhere tightly to the upper mold. In the closing step, the artificial tooth held in the normal position by the upper mold is held in the upper part of the mold space while maintaining that tight contact position. Furthermore, in the polymerization step of the molding process (C) described above, the molded resin that has been sandwiched (inserted), filled (injected), or built up in the formed mold space is heated and polymerized integrally with the artificial tooth.

[0101] During or before / after the thin-layer removal step of the demolding process, the 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 body of the closed upper or lower mold is removed. The polysynthetic model (1) of the denture described in claim 1 is characterized in that the molded resin body (4) (molded resin with a finished shape) is demolded 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. [Explanation of Symbols]

[0102] Heavy composite model 1 Thin-skin cup model 100 Remaining tooth model 11T Opening frame 12 Thickness 12T Opening frame 12 Fitting column 14, 24 Internal molded parts 16, 26 Inner frame 162 Inner frame space 160 Stationary metal 16M Thin-skin cup model (100) (upper type model) 2 Support column rows 151, 152, 251, 252 Upper mold resin (silicone resin) 2S This molded resin body 4 Artificial teeth 43 Clasp (accessory) 4C Bar plate (included) 4P Derivation routes 501, 201 Polymerization container (lower polymerization frame) 5,7 Upper polymerization frame (polymerization lid) 6,72 Molded resin RG Mold space RS Heat-melting wax WX Dental plaster 1DP, 1DP', 2DP, 2DP' forceps KT Release agent PR Heavy composite model molding process A Three-dimensional measurement step 3D Modeling Steps Filling and curing step a2, Mold setting process B Release agent application step, attached placement step b1 Artificial tooth placement steps b2, c11 Wax buildup step b2 Upper type set step b4 Main molding process C Closing step (mold space formation step) c1, Closed step c21 Polymerization treatment steps c2, c22 Demolding process D Plaster removal steps d2, d3 Thin layer removal step d3

Claims

1. A thin-skin cup model is formed by three-dimensional printing of elastic resin, in which the molded surface has a three-dimensional convex surface in the shape of the gingiva, including the portion facing the denture base, and the three-dimensional molded part is made of a thin skin of a certain thickness along this molded surface, and the thin skin has an open internal space on the back side of the three-dimensional molded part, and A molded model for a composite type denture, comprising: dental plaster filled and solidified in the open internal space at the bottom of a thin-shell cup model; A composite model of a denture, characterized in that, after composite molding, the dental plaster 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 main molded resin body and demolded.

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 molded surface of the thin-shell cup model can be modified after polycomposition by destroying and removing a portion of the internal structure other than the molded surface, or by cutting, cleaving, bending, or folding a portion of the surface structure other than the molded surface, and the thin-shell body of the thin-shell cup model can be peeled off and demolded from the polymerized molded resin body formed from the denture base, as described in claim 1.

4. The composite model of a denture 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 thin-shell cup model is characterized in that the internal space 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, as described in claim 1.

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-shelled cup model is an ultraviolet-curing resin mainly composed of an acrylic polymer agent.

8. "A three-dimensional measurement step in which the three-dimensional shape of the denture mounting surface and its surrounding area in the subject's oral cavity is measured in three dimensions by three-dimensional scanning, A three-dimensional molding step in which a thin-shell cup model having a three-dimensional shape based on the aforementioned three-dimensional measurement on its molded surface is three-dimensionally molded with a constant thickness using a three-dimensional printer, A composite model molding process comprising a filling and hardening step of filling the internal space of a thin-shell cup model with dental plaster and hardening it to obtain a composite model according to any one of claims 1 to 7, "The artificial tooth placement step involves positioning all necessary artificial teeth in the appropriate locations on top of the obtained composite model, via the molding resin of the finished denture base." The mold setting process consists of a mold release agent application step, in which a mold release agent is applied to the molded surface of the heavy synthetic model. "A closing step involves closing the top of the composite model to form a nearly sealed mold space containing the composite model, This molding process consists of a polymerization step in which molding resin is sandwiched, filled, or built up in the mold space and subjected to heat polymerization, and The demolding process consists of "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 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," It comprises each of the following processes: A method for manufacturing dentures, characterized in that, in the demolding step, the molded surface of the thin-shell cup model is bent and deformed by folding, cutting, tearing, or breaking a portion other than the molded surface of the thin-shell cup model in the heavy composite model of dentures according to any one of claims 1 to 7, and the dentures are demolded from the main molded resin to obtain dentures.

9. In the mold setting process, after the release agent application step, the process further includes an accessory placement step in which accessories to be attached to the finished denture base are pre-positioned in predetermined locations on the polymerization molding model. The method for manufacturing dentures according to claim 8.

10. In the mold setting step, molten wax is deposited onto a predetermined position on the polymerization model while being molded into the final shape, and the process further includes a wax buildup step in which artificial teeth to be used as dentures are fitted onto the molten wax using upper and lower impression models and placed in the final molded position. The molding process further comprises an upper mold setting step in which dental plaster is filled into the space above the built-up molten wax and artificial tooth, or the upper mold resin is closed and solidified to create a closed upper mold. The molding process includes a mold-forming step in which, in the mold-closing step, the molten wax is heated and melted and allowed to flow 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 molten wax is removed, thereby forming an internal mold space that conforms to the molded shape of the denture base. In the aforementioned upper mold setting step, the filled dental plaster or upper mold resin solidifies as the upper mold, causing the artificial teeth positioned in the correct positions to adhere tightly to the upper mold. In the closing step, the artificial tooth held in the normal position by the upper mold is held in the upper part of the mold space while maintaining that tight contact position. The method for manufacturing a denture according to claim 9, wherein in the polymerization step of the molding process, the molded resin sandwiched, filled, or built up in the formed mold space is integrally heated and polymerized with the artificial tooth.

11. During or before / after the thin-layer removal step of the demolding process, the 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 body of the closed upper or lower mold is removed. A method for manufacturing a denture according to claim 9, characterized in that, in the polysynthetic model of the denture described in claim 1, the molded surface of a thin cup model that is in close contact with the molded resin is bent into a convex shape and elastically deformed to demold the denture from the molded resin.

Images