Method for manufacturing dental prosthetic devices

Abstract

To provide a dental prosthesis apparatus in which positions and directions of components are determined only by combining the components without using a model by improving a shape of a combined portion of the components in order to solve such a problem that a partial plate denture has not been able to get out of a conventional method that uses the model.SOLUTION: A dental prosthesis apparatus 20 includes at least as components artificial tooth parts 21-26, denture base parts 30-33 and a various part 40. At least three contact lines that are in parallel to each other are formed with contact of two components when at least the two components of the components are combined. The two components have only a translation freedom degree in a direction of the contact lines.SELECTED DRAWING: Figure 4

Description

[Technical Field]

[0001] The present invention relates to a technology for dental prosthetic devices that allows components to be assembled without using an intraoral model (hereinafter referred to as a "model") made from gypsum material, additively manufactured resin material, or the like. [Background technology]

[0002] Among dental prosthetic devices, removable dentures can be broadly divided into complete dentures and partial dentures. Traditionally, when manufacturing dental prosthetic devices, the components that make up the denture, such as the artificial tooth parts and denture base parts, were manufactured separately, and then these components were placed on a model (working model) of the patient to determine their relative positions and orientations, and then the components were connected together using adhesive resin.

[0003] In recent years, dental prosthetic devices have come to be designed on computers using CAD / CAM technology after three-dimensional measurements of the patient's oral cavity have been taken with an intraoral scanner to create intraoral digital data (digital models). Furthermore, digitalization has progressed, with components of dental prosthetic devices being manufactured using methods such as cutting with NC machine tools and additive manufacturing with 3D printers (see, for example, Patent Document 1 and Non-Patent Document 1).

[0004] In particular, in the case of complete dentures, when all of the constituent artificial tooth parts and denture base parts are resin parts, a method for manufacturing a fully digitalized dental prosthetic device is known that completes the complete denture without using a model.

[0005] Meanwhile, partial dentures have long been used as prosthetic devices to replace partially missing teeth. Partial dentures include artificial tooth components, denture base components, and various other metal and ceramic components that are integrated with the others through a retaining lattice. These components include rests, major connectors, minor connectors, clasps, and proximal panels. Even for partial dentures, various components can be manufactured digitally. That is, they are manufactured by using CAD / CAM technology to machine various materials using NC processing or additive manufacturing, or by casting machined casting prototypes. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] JP 2022-24992 A (paragraphs 0066 to 0067, Figures 6 and 7) [Non-patent literature]

[0007] [Non-Patent Document 1] Journal of the Japanese Society of Prosthodontics, Vol. 14, No. 1 (2022), pp. 18-24, "Literature review on digitalization of partial dentures" Summary of the Invention [Problem to be solved by the invention]

[0008] However, the next step is to embed the various components arranged and fixed on the model, and then fill them with resin material to bond all the components together. Thus, with partial dentures, various components still need to be assembled with the model.

[0009] As mentioned above, dental prosthetic devices are becoming increasingly digitalized, but partial dentures have not yet been manufactured using the conventional method of using models. Therefore, in this invention, the parts that combine the components are shaped to be compatible with digital technology, so that the components can be assembled without using models. How to maketo provide. [Means for solving the problem]

[0010] The method for manufacturing a dental prosthesis according to the first invention is a method for manufacturing a dental prosthesis comprising at least an artificial tooth part, a denture base part, and various other parts as components, wherein when at least two of the components are combined, the two components come into contact with each other to form at least three parallel contact lines, and the two components have only a translational degree of freedom in the direction of the contact lines, and the positions and directions of the components when combined are uniquely determined, thereby making it possible to manufacture the dental prosthesis without using an oral cavity model. along the parallel contact lines The components can be assembled.

[0011] In the dental prosthetic device according to the first invention, when at least two of the components are combined, the two components come into contact with each other, forming at least three parallel contact lines. Since the two components have only translational freedom in the direction of the contact lines, the positions and directions of the two components when combined are uniquely determined. Therefore, the two components can be assembled without using a model. In other words, the metal component can be accurately loaded, fixed, and connected to the resin component.

[0012] The second invention The method for manufacturing dental prosthetic devices is as follows: The two components come into contact with each other. A "spigot joint" with no rotational degrees of freedom is constructed It is characterized by:

[0013] In the dental prosthetic device according to the second invention, a contact surface is formed when the two components come into contact with each other, and the contact line according to the first invention is included in the contact surface, so that the position and direction of the two components when assembled are uniquely determined. Therefore, the two components can be assembled without using a model. Furthermore, because the two components come into surface contact with each other, the two components can be bonded together with a small amount of resin material. [Effects of the Invention]

[0014] With the dental prosthetic device of the present invention, even for partial dentures made up of various metal components, the position and direction of the components can be determined without using a model. Since the production of dental prosthetic devices can be fully digitized, the number of manufacturing steps can be reduced, which also leads to a reduction in the number of visits the patient needs to make to the clinic. [Brief explanation of the drawings]

[0015] [Figure 1] FIG. 2 is a schematic diagram illustrating the contact state between two components in the dental prosthetic device according to the first invention. [Figure 2] FIG. 2 is a schematic diagram illustrating a state in which two components of the dental prosthetic device according to the first invention have translated in the direction of the contact line and separated from each other. [Figure 3] FIG. 10 is a schematic diagram illustrating a state in which two components of the dental prosthetic device according to the second invention have translated in the direction of the contact line and separated from each other. [Figure 4] FIG. 1 is an exploded perspective view of components illustrating a partial denture according to Example 1. [Figure 5] FIG. 5 is a detailed view of part A in FIG. 4. [Figure 6] This is a perspective view of the right half of the completed partial denture. [Figure 7] FIG. 10 is a perspective view of components of a partial denture according to Example 2. DETAILED DESCRIPTION OF THE INVENTION

[0016] (First embodiment) 1 is a schematic diagram illustrating the contact state between two components in a dental prosthesis device 7 according to a first embodiment. As shown in FIG. 1, the first component 1 is represented by a solid line, and the second component 2 is represented by a two-dot chain line.

[0017] When first component 1 and second component 2 are combined, first component 1 and second component 2 come into contact with each other, forming contact lines 3, 4, and 5. Contact lines 3, 4, and 5 are parallel to one another. Arrow 6 is a straight line parallel to the three contact lines (3 to 5) and indicates the direction of the translational degree of freedom that the two components have.

[0018] 2 is a schematic diagram illustrating a state in which the first component 1 and the second component 2 are separated from each other in the dental prosthesis device 7 according to the first embodiment. As shown in FIG. 2, three parallel contact lines are formed, and thus the dental prosthesis device 7 according to the first embodiment has only a translational degree of freedom in the direction of the contact lines (the direction of arrow 6).

[0019] In this way, by determining the shapes of the first component 1 and the second component 2 that make up the dental prosthetic device 7 so that when the two components are combined, they come into contact with each other to form at least three parallel contact lines 3, 4, and 5, the dental prosthetic device 7 can have only a translational degree of freedom in the direction of the contact lines. In other words, the position and direction of the first component 1 and the second component 2 when combined are uniquely determined. Therefore, the two components can be assembled without using a model.

[0020] In the dental prosthesis device 7 according to the first embodiment, as shown in Figures 1 and 2, the three contact lines 3, 4, and 5 formed by the contact between the first component 1 and the second component 2 are approximately the same length. However, the lengths of the three contact lines may be different. Furthermore, the contact lines may be short, as long as the components have only the degree of translational freedom in the direction of the contact lines.

[0021] (Second embodiment) 3 is a schematic diagram illustrating a state in which the third component 10 and the second component 2 are separated from each other in a dental prosthesis device 14 according to the second embodiment. As shown in FIG. 3, the two components 2 and 10 come into contact with each other to form a contact surface 11 (12, 13), and the contact surface 11 (12, 13) includes a contact line 3 (4, 5). As a result, the dental prosthesis device 14 according to the second embodiment has only a translational degree of freedom in the direction of the contact line (the direction of arrow 6).

[0022] In this way, by determining the shapes of the third component 10 and the second component 2 that make up the dental prosthesis device 14 so that the two components come into contact with each other when combined to form a contact surface 11 (12, 13), the third component 10 and the second component 2 can be made to have only a translational degree of freedom in the direction of the contact line. In other words, the position and direction of the third component 10 and the second component 2 when combined are uniquely determined. Therefore, the two components can be assembled without using a model.

[0023] The third component 10 and the second component 2 shown in FIG. 3 can be considered to constitute a "spigot joint" that does not have a rotational degree of freedom, which is one of the "spigot joints" in mechanical engineering.

[0024] In the first and second embodiments, for ease of understanding, an example has been described in which one of the two components of the dental prosthetic device according to the present invention fits snugly into the other. However, this is only an example, and it goes without saying that a part of one component may be a convex portion (male portion) and a part of the other component may be a concave portion (female portion). In this case, it is sufficient that the mating portion of the convex portion (male portion) and the concave portion (female portion) is as in the first or second embodiment. [Example]

[0025] A more specific partial denture 20 according to Example 1 will be described below with reference to FIGS. 4, 5 and 6. FIG.

[0026] The partial denture 20 according to Example 1 can be made by assembling all of the components in one step, and then bonding all of the bonding surfaces with adhesive resin or room temperature curing resin. Finally, the partial denture 20 can be made according to the usual method, with occlusion adjustment and so on.

[0027] 4 is an exploded perspective view of components illustrating the partial denture 20 according to Example 1. The partial denture 20 is composed of three artificial tooth parts 21, 22, and 23 in the mandibular left molar region, three artificial tooth parts 24, 25, and 26 in the mandibular right molar region, a left denture base polishing surface part 30, a left denture base mucosal surface part 31, a right denture base polishing surface part 32, a right denture base mucosal surface part 33, and various parts 40.

[0028] The above components of the partial denture 20 are conventionally fabricated using digital techniques by taking an optical impression using an intraoral scanner and then recording the jaw position.

[0029] The artificial tooth parts 21-26 may be designed using CAD / CAM technology to have a shape that meets the needs of each individual patient, and may be machined or additively manufactured. The artificial tooth parts 21-26 may also be prefabricated artificial teeth. The shape of the artificial tooth parts 21-26 may be a single tooth with each part being independent, or two or more tooth parts may be connected.

[0030] The denture base polishing surface portions 30, 32 and the denture base mucosal surface portions 31, 33 can also be manufactured by cutting or additive manufacturing using CAD / CAM technology. The denture base polishing surface portions 30, 32 are bases on which the artificial tooth components 21-26 are placed. The denture base polishing surface portions 30, 32 are formed with sockets 34-39 for embedding the artificial tooth components 21-26. Various known medical resin materials can be used for these components.

[0031] The various components 40 are manufactured by, for example, a known lost wax casting method using a medical metallic material.

[0032] Figure 5 is a detailed view of part A in Figure 4, and illustrates the assembly of the left denture mucosal surface portion 31 and various components 40. A plurality of contact surfaces 41, 42, 43, 44, ... are formed on the left denture mucosal surface portion 31. These contact surfaces 41, 42, 43, 44, ... include parallel contact lines. In addition, a plurality of contact surfaces 45, 46, 47, 48, ... are formed on the various components 40, corresponding to the contact surfaces of the left denture mucosal surface portion 31. These contact surfaces 45, 46, 47, 48, ... also include parallel contact lines.

[0033] As a result, the left denture mucosal surface portion 31 and the various components 40 have only a translational degree of freedom in the direction of the contact line 50. Therefore, the position and direction when the left denture mucosal surface portion 31 and the various components 40 are combined are uniquely determined. In other words, the left denture mucosal surface portion 31 and the various components 40 can be assembled without using a model.

[0034] In order to bond the left denture base mucosal surface portion 31 and the various components 40, a resin material is filled into the contact surface between them during assembly. As shown in Figure 5, the left denture base mucosal surface portion 31 and the various components 40 are assembled in a tightly contacting state, so the amount of adhesive resin material exposed to the outside can be kept to a minimum.

[0035] 6 is a perspective view of the left half of the completed partial denture 20. By sandwiching and fixing the various metal components 40 (retention grid) between the left denture base mucosal surface portion 31 and the left denture base polished surface portion 30, all of the components, including the artificial tooth components 21 to 23, can be produced simultaneously, and all of the components can be easily assembled and connected along the parallel contact lines installed on each component.

[0036] In other words, the components of the partial denture 20, the three artificial tooth parts 21, 22, 23 that will become the left molars of the lower jaw, the left denture base polishing surface part 30, the left denture base mucosal surface part 31, and various parts 40 can be assembled, glued, and completed without using a model.

[0037] (Attachment / detachment direction guide axis) The attachment / detachment direction guide axis and attachment / detachment direction guide hole that are useful when assembling the denture base polishing surface portion and the denture base mucosal surface portion will be explained below using the left denture base polishing surface portion 30 and the left denture base mucosal surface portion 31 in Example 1 as examples.

[0038] 4, an attachment / detachment direction guide axis 51 and an attachment / detachment direction guide axis 52 are erected on the left denture base mucosal surface portion 31 toward the left denture base polishing surface portion 30. In addition, a attachment / detachment direction guide hole 53 and an attachment / detachment direction guide hole 54 are formed in the left denture base polishing surface portion 30 at positions corresponding to the attachment / detachment direction guide axis 51 and the attachment / detachment direction guide hole 52. When the attachment / detachment direction guide axis 51 and the attachment / detachment direction guide hole 53 are combined, and when the attachment / detachment direction guide axis 52 and the attachment / detachment direction guide hole 54 are combined, only the translational degree of freedom in the direction of the contact line is retained, similar to the third constituent element 10 and the second constituent element 2 in the second embodiment.

[0039] When assembling the left denture base mucosal surface portion 31 and the left denture base polishing surface portion 30, the position of the tip of the removal direction guide axis 51 (52) can be confirmed from above the removal direction guide hole 53 (54). Therefore, by referring to the removal direction guide axis 51 (52), not only can the two be positioned accurately, but the degree of lifting in particular can also be clearly observed. The right denture polishing surface portion 32 and the right denture base mucosal surface portion 33 are also provided with exactly the same removal direction guide axis and removal direction guide hole.

[0040] After the usual try-in in the patient's mouth, the fabricator takes all of the components and heats and polymerizes the resin material at a dental laboratory to combine them, then polishes and completes the fabricated partial denture. However, the partial denture 20 according to Example 1 begins functioning in the patient's mouth on the same day, which can reduce the number of visits the patient needs to make to the clinic.

[0041] As described above, according to the dental prosthetic device of the present invention, if the polished surface of the denture base to which the artificial tooth components are attached and the mucosal surface of the denture base to which the metal components are attached are all manufactured and integrated at the same time in a dental laboratory, a functional partial denture can be provided on the same day. [Example]

[0042] A partial denture 60 according to Example 2 will be described below with reference to Fig. 7. Fig. 7 is a perspective view of the components of the partial denture 60 according to Example 2. Of the components that make up the partial denture 60, a denture base mucosal surface portion 61 and various parts 62 are combined together.

[0043] As shown in Figure 7, when the denture base mucosal surface portion 61 and various components 62 are combined, the denture base mucosal surface portion 61 and various components 62 come into contact with each other, forming at least three parallel contact lines, and the denture base mucosal surface portion 61 and various components 62 only have a translational degree of freedom in the direction of the contact lines (direction of arrow 63).

[0044] Therefore, the position and direction when the denture base mucosal surface portion 61 and the various components 62 are combined can be determined uniquely. In other words, the denture base mucosal surface portion 61 and the various components 62 can be assembled without using a model. When joining the components, most of the resin used for adhesion can be contained within, minimizing exposure of the autopolymerizing resin to the outside.

[0045] Conventionally, the manufacturing process for partial dentures has involved a resin polymerization method using a mold-by-implantation method using a model, and even in recent denture manufacturing methods where digitalization has progressed, this has remained an unresolved process that lacked continuity with the digitalization. However, as shown in Examples 1 and 2, the present invention makes it possible to propose a completely digital manufacturing method for partial dentures that does away with the conventional method.

[0046] The dental prosthetic device of the present invention allows users to confirm the completed or postoperative state of the dental prosthetic device before assembly, simulating the process leading to optimal clinical results. This experience allows users to consider in advance the individual problems and issues that must be addressed, which is an extremely important process that helps them make accurate clinical diagnoses and provide objective instructions to the fabricator. This process, which previously required excellent judgment and trial and error with skilled manufacturing techniques, can now be performed by anyone using CAD / CAM technology.

[0047] Furthermore, the dental prosthetic device of the present invention can simplify the conventional method of manufacturing a dental prosthetic device by eliminating the unnecessary transitional labor required in the past when manufacturing a partial denture, thereby making it more economical.

[0048] Although preferred embodiments of the present invention have been described above, the present invention is not limited to these embodiments. Addition, omission, substitution, and other modifications of components are possible without departing from the spirit of the present invention. Furthermore, since this can be considered a result of an increase in the number of missing teeth in a partial denture, it is easy to imagine that the present invention can also be applied to the production of so-called metal-base dentures, where complete dentures are made of a composite material of metal and resin. The present invention is not limited by the above description, but is defined by the appended claims. [Explanation of symbols]

[0049] 1: First component 2: Second component 3, 4: Contact line 7: Dental prosthetic device (first embodiment) 10: The third component 11~13: Contact surface 14: Dental prosthetic device (second embodiment) 20: Partial dentures (dental prosthetic devices) 21~26: Artificial tooth parts 30: Left side denture base polished surface part 31: Left dental mucosa of the face 32: Right-side dental bed grinding of the face 33: Right side of the dental prosthesis mucosa face 40: Various parts 40~48: Contact surface 60: Partial bed replacement (bed repair device) 61: Dental Cavity Mucosa Facial 62: Various parts

Claims

1. A method for manufacturing a dental prosthetic device having at least an artificial tooth part, a denture base part, and various parts as constituent elements, comprising: A method for manufacturing a dental prosthetic device, wherein when at least two of the components are combined, the two components come into contact with each other, forming at least three mutually parallel contact lines, and the two components have only a translational degree of freedom in the direction of the contact lines, and the position and direction of the components when combined are uniquely determined, thereby allowing the components to be assembled along the parallel contact lines without using an intraoral model.

2. 2. The method for manufacturing a dental prosthetic device according to claim 1, wherein the two components come into contact with each other to form a "spigot joint" that has no rotational degree of freedom.

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