JP6542176B2 - Floor-mounted prosthetic device and method of manufacturing the same - Google Patents

Description

  The present invention relates to a floor-standing prosthetic device to be attached to an oral tissue and a method of manufacturing the same, and more particularly, to a technique for reducing weight and improving functionality.

  A maxillary or mandibular defect (jaw defect) caused by tumor excision, trauma, congenital malformation, etc. results in an aesthetic disorder caused by dysfunction such as chewing or swallowing, or a prosthetic device It is necessary to use a mandibular denture, which is In addition, when a trafficking part (through hole) is formed in the palate due to the jaw defect on the upper jaw side, articulation between the oral cavity and the nasal cavity causes dysarthria (open nose voice), foreign matter intrusion into the nasal cavity, etc. It is common to attach an obturator to the denture base to close the traffic part. There are solid, hollow and canopy open types of obturators, but if the jaw defect is large, the solid type will increase the weight and cause maintenance failure, so the hollow type and canopy open type are adopted (See Patent Document 1). Further, it is a reality that the weight of the denture especially on the upper jaw side contributes to the maintenance and reduction even in a conventional denture having no obturator.

JP, 2006-342, A

  In the manufacture of a denture having a hollow type obturator, the denture base and the obturator are separately manufactured, and the denture body (prosthetic device main body) is formed by bonding them with a polymer resin, and then the denture base is formed. The process of bonding an artificial tooth to is taken. When using the thus prepared jaw denture for a long period of time, a gap resulting from peeling or the like is generated at the joint between the denture base and the obturator, and saliva, nasal discharge, exudates or the like enter the jaw denture from the gap. Is inevitable. Then, saliva, nasal discharge, etc. which has infiltrated into the lower denture become a hotbed of bacteria by being stored in the hollow portion of the obturator, which may cause aspiration pneumonia and the like.

  On the other hand, after the denture base and the hollow obturator are separately manufactured, the conventional method of joining them is very complicated in the manufacturing process, and it takes a lot of time and man-hours to manufacture, and There is a problem that the accuracy must be dependent on the degree of skill of the dental technician.

  The present invention has been made in view of the above situation, and it is an object of the present invention to provide a floor prosthetic device that can be manufactured in a relatively short time while securing light weight, high accuracy, high performance, and durability, and a method of manufacturing the same. To aim.

  The floor-standing prosthetic device of the present invention is a floor-standing prosthetic device having a prosthetic device main body having a hollow portion and mounted on an oral tissue, wherein the prosthetic device main body is an integrally formed article made of resin as a material.

  Preferably, the prosthetic device main body has a denture base to which an artificial tooth is attached, and an obturator for prostheticing an upper jaw defect, and the hollow portion is formed in at least one of the denture base and the obturator. It was done.

  Preferably, the hollow portion is provided with a reinforcing structure that connects the inner walls of the hollow portion.

The method of manufacturing the prosthetic device of the present invention includes the steps of creating three-dimensional data of the prosthetic device body, and shaping the prosthetic device body by a 3D printer based on the three-dimensional data.

  Preferably, the prosthodontic device main body has an obturator for prostheticing an upper jaw defect, and includes a step of taking an impression of the upper jaw and the upper jaw defect to create a model, and the three-dimensional data includes the working model Acquired by 3D scanning

  Preferably, in the production of the working model, the undercut at a portion corresponding to the upper jaw defect is blocked out with wax.

  According to the endoprosthetic device according to the present invention, in the jaw denture, the aspiration pneumonia or the like caused by the infiltration of saliva or nasal fluid into the hollow portion while ensuring light weight, high accuracy, high performance and durability. It is prevented. And also in a normal denture, maintenance reduction is effectively controlled by weight being reduced. Further, according to the manufacturing method according to the present invention, it is possible to stably manufacture a highly accurate on-floor prosthetic device regardless of the level of skill of a dental technician.

It is a longitudinal cross-sectional view which shows the mounting state of the jaw denture which concerns on embodiment. It is a three-sided view of a jaw denture concerning an embodiment. It is a perspective view from the diagonally downward of the denture base which made the gingival region a section. It is a perspective view from diagonally upper of the obturator which cut the principal part. It is a figure which shows the process of making the silicone impression of an upper jaw defect part from a working model. It is a perspective view of the obturator model. It is a figure which shows the plane and oblique view of a denture base model. It is a figure which shows the preparation procedure of a jaw denture frame model. It is a figure which shows the manufacture state of a denture base and obturator by 3D printer. It is a figure which shows the assembly procedure of a jaw denture.

  Hereinafter, an embodiment in which the present invention is applied to a jaw denture and a method for manufacturing the same will be described in detail with reference to FIGS.

<Composition of jaw dentures>
FIG. 1 is a longitudinal cross-sectional view showing a wearing state of a jaw denture according to the embodiment. Fig. 2 is a trihedral view of a jaw denture according to the embodiment, Fig. 2 (a) shows a front, Fig. 2 (b) shows a plane, and Fig. 2 (c) shows a left side. FIG. 3 is a perspective view of the denture base from the obliquely lower side, with the gingival section being sectioned. FIG. 4 is a perspective view from the obliquely upper side of the obturator in which the main part is cut.

  As shown in FIG. 1, the patient 1 not only loses the teeth of the maxilla 2 and retracts and absorbs the lower part of the jaw ridge 3 and maxilla 4 but also includes the defect part 6 including the palate 5 by excision of the tumor. Are present on the palate 7. The jaw denture 20 has a jaw denture main body composed of a denture base 22 holding an artificial tooth 21 and an obturator 25 for closing the traffic section 8 due to a defect of the palate 7, and can be chewed by the artificial tooth 21 While preventing nasal dissemination etc. caused by the communication between the oral cavity 9 and the nasal cavity 10. In FIG. 1, reference numeral 11 denotes a mandible (alveolar part), reference numeral 12 denotes a tooth of a lower jaw 13, and reference numeral 14 denotes a tongue.

  As shown in FIG. 2, the denture base 22 has an arch-like gingival portion 23 to which the artificial tooth 21 is adhered and a plate-like palate portion 24 in close contact with the lower surface of the palate 7. As shown in FIG. 3, the gingival region 23 is composed of a relatively thick outer shell 23a, a hollow portion 23b surrounded by the outer shell 23a, and a reinforcing structure 23c provided in the hollow portion 23b. The reinforcing structure 23c is composed of a large number of thin plates vertically and horizontally arranged at predetermined intervals, and its end portion is continuous with the inner wall of the outer shell 23a.

  As shown in FIG. 2, the obturator 25 has a dome shape that seals the defect portion 6 (see FIG. 1) of the palate 7, and the lower end is continuous with the denture base 22. As shown in FIG. 4, the obturator 25 is composed of a very thin shell 25a, a hollow portion 25b surrounded by the shell 25a, and a reinforcing structure 25c provided in the hollow portion 25b. The reinforcing structure 25c is composed of a large number of thin plates vertically and horizontally arranged at predetermined intervals, and its end is continuous with the inner wall of the shell 25a and the denture base 22 (see FIG. 2).

<Procedure for making a prosthetic denture>
FIGS. 5 (a) to 5 (c) are diagrams showing a process of applying a silicone impression of the upper jaw defect from the working model.
As shown in FIG. 5A, a worker (a dental technician or the like) manufactures a working model 30 with anhydrite etc. based on the impression acquisition with the silicone impression material of the upper jaw of the patient 1, as shown in FIG. 5 (a). Next, as shown in FIG. 5 (b), the worker fills the defective portion 32 of the palate 31 in the working model 30 with a silicone impression material 35 of appropriate viscosity and hardens it. Next, the operator sets the joint surface SC between the denture base 22 and the obturator 25 and cuts the surplus portion of the silicone impression material 35 in a planar shape at the joint surface SC. Next, the worker manufactures an occlusal floor and performs occlusal acquisition with the occlusal device, and then removes the hardened silicone impression material 35 as the obturator model 36, as shown in FIG. 5 (c).

  Next, the operator blocks out the undercut of the defect portion 32 in the working model 30 with wax, and then scans the working model 30 with the optical 3D scanner. As a result, since palatal impression data of the patient 1 can be obtained, a virtual working model on the side of the denture base 22 is created in the computer. Also, an occlusal model (not shown) manufactured based on occlusion acquisition is scanned by an optical 3D scanner to create a virtual occlusion model in a computer.

(Creating an obturator model)
FIG. 6 is a perspective view of the obturator model.
Next, after scanning the obturator model 36 with the optical 3D scanner, the operator integrates the acquired obturator impression data with the inverted data of the missing part of the virtual work model using three-dimensional CAD software. . As a result, as shown in FIG. 6A, a solid obturator model 45 including all irregularities is created in the computer with respect to the missing part 32 of the palate 31 in the working model 30. Next, the worker sets the outer wall of the obturator model 45 to a predetermined thickness (for example, 0.2 mm) and the internal filling rate to 0% in order to reduce the weight of the jaw denture 20, as shown in FIG. 6 (b). As shown, it changes into what consists of a very thin shell 45a and the hollow part 45b enclosed by the shell 45a. However, since the strength of the entire jaw denture 20 is reduced as it is, a reinforcing structure 45c in which thin plates having a predetermined thickness (for example, 0.25 mm) are arranged in the longitudinal and lateral directions is provided in the hollow portion 45b. The reinforcing structure 45 c is continuous with the inner wall of the shell 45 a of the obturator model 45 and the palate 44 (described later) of the denture base model 42.

(Creating denture base model)
FIG. 7 is a plan view and a perspective view of a denture base model.
The operator uses a three-dimensional CAD software based on the virtual work model or virtual occlusion model on the side of the denture base 22 described above, and as shown in FIG. 7A, a denture base comprising a gum portion 43 and a palate 44 Design a model 42. At this time, the operator compensates for the loss of fine morphological data, and determines the shapes of the positioning convex portion and the interdental papilla taking into consideration the joining of the artificial tooth 21 and the denture base 22. Next, the operator sets the outer wall of the gingival portion 43 (dental cavity portion) to a predetermined thickness (for example, 0.5 mm) and the internal filling rate to 0% in order to reduce the weight of the jaw denture 20, as shown in FIG. As shown to (b), it changes into what consists of the hollow part 43b enclosed by the outer shell 43a and the outer shell 43a. Also in the gingival region 43 of the denture base model 42, the hollow portion is a reinforcing structure 43c in which thin plates having a predetermined thickness (for example, 0.25 mm) are vertically and horizontally arranged so as not to decrease the strength required for wrinkles and the like. Provided in 43b. The reinforcing structure 43c is continued to the inner wall of the outer shell 43a.

(Combination of denture base model and obturator model)
FIG. 8 is a diagram showing a procedure for creating a jaw denture frame model.
The operator performs alignment on the computer using the joint surface SC (cutting plane) of the silicone impression material 35 as shown in FIG. 8A, and as shown in FIG. 8B, a denture base model. A jaw denture frame model 40 in which the B.42 and the obturator model 45 are integrated is created.

(Manufacture of jaw dentures)
FIG. 9 is a view showing a production state of a denture base and an obturator by a 3D printer.
FIG. 10 is a view showing an assembling procedure of the lower denture.
After the creation of the jaw denture frame model 40, as shown in FIG. 9, the operator sets the base 52 on the table 51 of the heat melting laminated 3D printer (not shown), and then the jaw denture frame model 40. Send and start digital data. Then, the molten PLA (polylactic acid resin) filament 54 is discharged from the three-dimensionally moving printer nozzle 53, and the denture base 22 and the obturator 25 are shaped seamlessly on the base 52. When the denture base 22 and the obturator 25 are completed, the worker performs fine shape correction and surface treatment.

  Next, the operator reproduces the virtual occlusion model described above on a virtual articulator, and corrects the data into a superposition of denture base data on a virtual work model. Next, the worker designs the artificial tooth 21 as a bridge on the abutment tooth previously applied to the denture base 22 using three-dimensional CAD software. Next, the worker molds the artificial tooth 21 from the hybrid resin block 61 as shown in FIG. 10A using a CAM cutting machine (not shown). When the artificial tooth 21 is obtained, the worker assembles the artificial tooth 21 to the gingival portion 43 of the denture base 22 as shown in FIG. 10 (b), and integrates the denture base 22 and the artificial tooth 21 by welding processing. Make the denture 20 complete.

  According to the jaw denture 20 according to the present embodiment, since the seamless structure does not have a joint between the denture base 22 and the obturator 25, it is caused by the infiltration of saliva or nasal fluid into the hollow portion 25b of the obturator 25. Aspiration pneumonia etc. are effectively prevented. Further, since the reinforcing structure 23c is disposed in the hollow portion 23b of the obturator 25, it is possible to reduce the deformation of the obturator 25 and to prevent the occurrence of tearing while realizing the weight reduction of the jaw denture 20. In addition, since the hollow portion 23b is provided in the gingival portion 23 of the denture base 22 and the reinforcing structure 23c is disposed in the hollow portion 23b, good chewing by the artificial tooth 21 and the like can be achieved while further reducing the weight of the jaw denture 20. Is possible.

  On the other hand, according to the method of manufacturing the jaw denture 20 according to the present embodiment, since the three-dimensional CAD and 3D printer are adopted for design and manufacture, the high precision jaw denture 20 can be stably stabilized regardless of the level of skill of the dental technician. It becomes possible to produce. In addition, by creating a denture base model and an obturator model as a database, it is possible to improve the production efficiency of the denture.

  Although the specific embodiments have been described above, aspects of the present invention are not limited thereto. For example, although the above-mentioned embodiment applies the present invention to a jaw denture and a method for manufacturing the same, it is naturally also possible to have another type of floor prosthesis and a method for manufacturing the same. It is applicable. Further, in the above embodiment, an impression was obtained using a silicone impression material on the upper jaw to manufacture a working model, but in order to reduce the burden on the patient, an intraoral optical scanner, MRI, CT or the like is used It may be possible to obtain an impression without contact. Further, the reinforcing structure disposed in the hollow portion may be a honeycomb core or the like, and ceramics or lithium disilicate may be adopted as a material of the artificial tooth. In addition, as the 3D printer, those by the optical forming method, the ink jet method, etc. may be adopted, and instead of the polylactic acid resin, acrylic resin, polycarbonate resin, nylon resin, polyether ether ketone resin may be used as the material of the prosthetic device body. May be adopted. In addition, the specific shape and the like of the prosthetic device main body can be appropriately changed.

  The present invention can be effectively used for a floor-mounted prosthetic device attached to oral tissue and a method of manufacturing the same.

2 upper jaw 6 defect portion 20 jaw denture 21 artificial tooth 22 denture base 23 gingival portion 23 a outer shell 23 b hollow portion 23 c reinforcing structure 24 palate 25 obturator 25 a outer shell 25 b hollow portion 25 c reinforcing structure 30 working model 31 palate 32 defect portion 40 jaw denture frame model 42 denture base model 45 obturator model

Claims (5)

What is claimed is: 1. A floor-mounted prosthetic device having a prosthetic device body having a hollow portion and mounted on oral tissue, comprising:
The prosthetic device body is an integrally formed product made of resin ,
The floor-standing prosthetic device is provided with a reinforcing structure that connects the inner walls of the hollow portion in the hollow portion . The prosthetic device body has a denture base to which an artificial tooth is attached, and an obturator for prostheses of an upper jaw defect portion,
The floor-standing prosthetic device according to claim 1, wherein the hollow portion is formed in at least one of the denture base and the obturator. A method of manufacturing a floor-mounted prosthetic device mounted on the oral cavity tissue according to claim 1 , wherein
Creating three-dimensional data of the prosthetic device body;
And D. forming the prosthetic device body with a 3D printer based on the three-dimensional data. The prosthetic device body has an obturator for prostheticing an upper jaw defect,
Including the steps of impressing the upper and upper jaw defects and creating a model,
The three-dimensional data is acquired by 3D scanning the working model,
A method of making a prosthetic device according to claim 3 . 5. The method of manufacturing a prosthetic device according to claim 4 , wherein the undercut at a portion corresponding to the upper jaw defect portion is blocked out with wax when manufacturing the working model.

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