JPH09220237A - Manufacture of dental plate - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress the variation in the quality of dental plates by forming dental plate shape data in accordance with main part model data and pattern shape data selected from a data base and photomodeling the dental plates in accordance with this shape data. SOLUTION: An impression pattern is formed this impression pattern is measured by a measuring means 2 and, then, a pattern model is formed. A means 9 for recognizing the external shape of the dental plate determines its external shape. A means 10 for selecting the main part model selects the desired main part model. A means 12 for forming a palate part forms a palate plate part. A means 13 for forming the extension plate forms the extension plate. The dental plate model is formed by connecting the gingiva, palate and extension plate of the main part model. A means 15 for forming NC data for photomodeling forms NC data in accordance with the dental plate model. As a result, the quality is made uniform.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a denture base.

[0002]

2. Description of the Related Art Conventionally, in order to manufacture a denture base, an impression is taken on the side of the missing tooth in the oral cavity, for example, the upper jaw and the lower jaw which is the opposite tooth side. Next, inject dental plaster into the impression and then
Make a model of the lower jaw. After that, the artificial teeth are arranged on the model of the upper jaw by observing the relation of the upper and lower sides, and at the same time, the tooth denture is formed to create the wax denture. Next, the wax denture is embedded in a flask with gypsum, and after the gypsum is hardened, the wax is melted and discharged. As a result, a gypsum mold having a cavity having the same shape as the denture base of wax and having an artificial tooth fixed thereto is manufactured. After that, a synthetic resin is filled in the cavity by an appropriate method such as an injection molding method or a compression molding method, and after the resin is hardened, the gypsum mold is crushed to take out a molded product, which is polished and finished to complete. in this way,
In order to manufacture a denture base, it is necessary to create a wax denture, create a gypsum mold according to the wax denture, and further perform resin molding or molding / polymerization to index the molded product.

[0003]

In the above prior art, a dental technician arranges artificial teeth on a model by using an articulator or the like and creates a dental caries to create a wax denture, so that a denture The quality of the floor depends largely on the technical skills of the dental technicians involved in the production of the floor, and there are variations in quality due to differences in the proficiency level of the dental technicians, making it difficult to set quality standards.
In recent years, research on manufacturing a dental prosthesis by using a three-dimensional system has been advanced, which tends to improve quality uniformly. For example, a method of directly photographing the inside of the oral cavity and creating processing data based on the photographed image to produce an inlay or an onlay, or a method of producing a crown prosthesis using a three-dimensional system is an abutment tooth. Take an impression of the opposite tooth and its surroundings, inject dental anhydrite into the impression and harden it to make a model, measure the shape of this model with three-dimensional measurement technology, and treat it with the treated tooth. The surrounding data is stored in a computer, a three-dimensional model is created from the data, and the general prosthesis shape selected from the database is overlaid on this three-dimensional model, and the shape required for replication is The general shape is deformed so as to match the function, NC data of this deformed shape is created, and the NC machine tool such as a milling machine is controlled by this NC data to correct the crown. Such as those that manufacture things have been proposed. However, all of these are methods of manufacturing crown portions such as crowns, inlays, and onlays, and the denture base has not been considered, and it has been difficult to manufacture a denture base using the above technique.

Therefore, it is an object of the present invention to provide a method for manufacturing a denture base that can suppress and improve quality variations.

[0005]

In order to solve the above-mentioned problems, the method for manufacturing a denture base of the present invention measures a model by impression, selects a main part model from a database based on the shape data of this model, Create denture base shape data based on the main part model data and the model shape data,
The optical modeling apparatus is controlled based on this shape data. Further, the present invention measures a model based on an impression, transmits the measurement data from a dental clinic or a laboratory to a management center, and the management center creates shape data of a denture base based on the shape data of the model, N based on data
The C data is created, this NC data is transmitted to a dental clinic or a laboratory, and the denture base is manufactured by controlling the stereolithography apparatus at the dental clinic or the laboratory.

According to the present invention, the denture base shape data is created based on the main part model data and the model shape data selected from the database, and the denture base is photoformed based on this shape data. Further, according to the present invention, a dental clinic or a laboratory obtains impression model measurement data, and a management center creates NC data of denture base shape data.
Stereolithography the denture base at the dental clinic or laboratory.

[0006]

Embodiments of the present invention will be described below with reference to the accompanying drawings. FIG. 1 shows an embodiment of an apparatus configured to manufacture a denture base, which comprises a three-dimensional CAD / CAM 1, a measuring unit 2, a stereolithography apparatus 3, a display 4, and an input unit 5. The three-dimensional CAD / CAM 1 includes a database 6 of a main part model including at least an artificial tooth and a gingiva part, a measurement data memory 7, a model processing part 8, a floor outer shape part recognition means 9, and a main part model selection means 10. Occlusal simulation means 11, palate forming means 12,
Floor wing part forming means 13, denture base model forming means 14,
It is composed of the stereolithography NC data creating means 15. In the database 6, a large number of main model models are grouped and stored according to various specifications. The model processing unit 8 creates a surface model, which is model shape data, from the three-dimensional coordinate value measurement data obtained by the measuring means 2. The floor outline recognition unit 9 recognizes the shape of the floor outline according to the surface model. The main part model selecting means 10 selects the most suitable main part model from the database 6 based on the surface model. The occlusal simulation means 11 determines the position of the main part model in relation to the model shape data. The palate forming means 12 forms a palate having a predetermined thickness according to the shape of the mucosal surface of the model in the range of the floor outline recognized by the floor outline recognition unit 9. The floor wing portion forming means 13 forms a floor wing portion according to the floor outer shape portion recognized by the floor outer shape portion recognizing means 9. The denture base model forming means 14 forms a surface model of the denture base by connecting the gingival portion of the selected main body model, the palate portion, and the floor wing portion. In this case, the model of the denture base refers to the shape model data including the floor and artificial teeth or the shape model data of only the floor. The stereolithography NC data creating means 15 produces data for controlling the stereolithography device 3. The measuring means 2 can use an appropriate device capable of inputting measured data to the measured data memory 7. For example, when a contact type or non-contact type three-dimensional measuring machine is used, an impression is taken as in the prior art, A model is created by injecting and hardening dental anhydrite into the model, a survey line of the denture base outer shape part is formed on the model, and the shape of the model is measured by a coordinate measuring machine and stored in the measurement data memory 7. In this case, it is desirable that the measurement data be stored as data in which point sequence data is wireframed and smoothed. Similarly, when a CT scan is used, the model is stored in the measurement data memory 7 as three-dimensional data measured by the method. In the main part model database 6, a large number of main parts of a bed denture in which artificial teeth are arranged and a tooth is formed are manufactured in accordance with clinical cases, and three-dimensional coordinate value data is measured by measuring the above-mentioned three-dimensional measuring machine. Then, shape data such as a surface model created by a conventional method using three-dimensional CAD / CAM based on the three-dimensional coordinate value data is stored. A large number of jigs in which artificial teeth are arranged are prepared according to each model, and the jigs are set in the stereolithography apparatus 3. The stereolithography device 3 is
As shown in FIG. 3, a Z-axis elevator 18 is provided to be movable up and down in a tank 17 containing a photocurable resin 16, and X
The laser head 20 of the Y scanner 19 is configured to emit a laser 21 such as ultraviolet rays, and the above-described jig 23 is detachably attached to the table 22 of the Z-axis elevator 18 via the position adjusting mechanism 24. There is. FIG.
Shows an example of the position adjusting mechanism 24, which has a jig 23 made in a female mold with gypsum or the like according to the artificial tooth arrangement state of the main part model, and the artificial tooth 25 is fitted into the jig 23. There is. The jig 23 is housed in the case 26, and the case 26
Is provided with a rail 27, a feed screw 28, and a pulse motor 29 for the X-axis direction via a frame 30, and a rail 31, a feed screw 32, and a pulse motor 33 for the Y-axis direction via a frame 35A. Rail 3 for Z-axis direction
4, a feed screw 35, and a pulse motor 36 are provided via a frame (not shown). The jig 23 and the position adjusting mechanism 24 described above are provided for the front tooth portion, the left molar portion, and the right molar portion, respectively, so that they can be adjusted individually. The pulse motors 29, 33, 36 are controlled according to the moving position of the main part model adjusted by the occlusion simulation means 11. In this embodiment,
It is operated in an interactive manner with the display contents of the display 4, and for example, when the partial floor 37 of the upper jaw shown in FIG. 12 is manufactured, the procedure according to the impression shown in FIG.
8 and 39 are formed, the survey line 40 of the denture base outer shape part is formed in the groove, and the models 38 and 39 are measured by the three-dimensional measuring machine which is the measuring means 2, and the three-dimensional coordinate value data is stored in the measurement data memory 7. input. Further, the input means 5 inputs specification data such as the type of the partial denture 37, the location of the missing tooth, the size and type of the artificial tooth to be used. Next, the model processing unit 8 creates a wire frame model from the measurement data, and further, a model model 41 including a surface model,
Create 42. Next, the floor outer shape recognizing unit 9 determines the outer shape of the denture base according to the shape data of the survey line 40 in the model model 41. Next, the main part model selecting means 10 sequentially reads out a plurality of main part models in the group selected based on the specification data, and the occlusal simulation means 11 adjusts the shape of the maxillary ridge as shown in FIG. A simulation of occlusion is performed with the mandibular model model 42 that is the remaining tooth, the main part model 43 that most occludes is selected, and the position of the main part model 43 is determined. This main model 43
Is composed of at least an artificial tooth 44 and a gum portion 45.
Next, as shown in FIG. 8, the palate forming means 12 creates a palate 46 having a predetermined thickness according to the mucosal surface shape of the model model 41 of the maxilla in the range of the denture base outline. Next, as shown in FIG. 9, the floor wing portion forming means 13 creates a floor wing portion 47 having a predetermined thickness according to the outer shape of the denture base and its mucous membrane surface shape. Next, the denture base model forming means 14 connects the gingiva part 45, the palate part 46 and the floor wing part 47 of the selected main part model 43 as shown by the wavy line in FIG. By removing the gingiva part 45 according to the shape of the ridge of the model model 41, a denture base model 48 which is a surface model is created as shown in FIG. The model 48 in this case shows shape data including a floor and artificial teeth. Stereolithography NC data creation means 1
5 creates control data according to the denture base model 48. Table 22 of Z-axis elevator 18 of stereolithography apparatus 3
A jig 23 having artificial teeth 44 arranged in accordance with the selected model is attached to, and the jig 23 is set under the control of the position adjusting mechanism 24 in a state determined by the occlusion simulation. In this state, the laser 21 is sequentially irradiated and the table 22 is lowered to manufacture a denture base. In this case, since the laser emitted according to the artificial tooth shape data irradiates the set artificial teeth, the interdental papilla between the artificial teeth is also resin-molded neatly. After that, polishing and finishing are performed to obtain a product, but if necessary, the artificial teeth are adjusted to be engaged. As described above, in the above-described embodiment, the model based on the impression is measured, the main part model including at least the artificial tooth and the gingival part is selected from the database based on the shape data of the model, and the main part model data and the model shape data are selected. Since the denture base shape data is created based on the above and the stereolithography apparatus is controlled based on this shape data, the quality of the denture base can be made uniform. Further, the number of manufacturing steps is reduced as compared with the conventional one, and the efficiency can be improved. FIG. 13 and FIG. 14 show another embodiment, in which the same parts as those in the above embodiment are designated by the same reference numerals and the description of the same parts is omitted. FIG. 13 is a system configured to manufacture a denture base. The management center 51 and the dental clinic 52 or the laboratory are connected via the communication lines 55 such as telephone lines via the input / output devices 53 and 54. In the dental clinic 52 or the laboratory, the arithmetic processing means 1 including a personal computer and the measuring means 2 are provided.
The optical modeling apparatus 3, the display 4, and the input means 5 are provided. The management center 51 is provided with a three-dimensional CAD / CAM 56 composed of an image workstation, an input means 57, and a display 58. The three-dimensional CAD / CAM 56 has a main part model including at least artificial teeth and gingiva. Database 6, measurement data memory 7, model processing unit 8, and floor outline recognition unit 9
A main part model selecting means 10, an occlusion simulation means 11, a palate forming means 12, a floor wing forming means 13, a denture model forming means 14, and a stereolithographic NC data creating means 15. ing. For example, the procedure for producing the partial denture 37 of the lower jaw shown in FIG. 12 is as follows: As shown in FIG. 14, a dental clinic 52 or a laboratory is used to create upper and lower jaw models 38, 39 according to the impression shown in FIG. The survey line 40 of the denture base outer shape portion is formed, the models 27 and 28 are measured by the three-dimensional measuring machine which is the measuring means 2, the three-dimensional coordinate value data is obtained and stored in the memory of the arithmetic processing means 1. In addition, specification data such as the type of the partial denture 37, the location of the missing tooth portion, the size and type of the artificial tooth to be used are input by the input means 5. Then, the measurement data and the attribute data are transmitted from the dental clinic 52 or the laboratory to the management center 51 via the input / output devices 53 and 54 through the communication line 55. The management center 51 receives this and stores the measurement data in the measurement data memory 7 and the attribute data in a memory (not shown). In the management center 51, the model processing unit 8 creates a wireframe model from the measurement data,
Furthermore, model models 41 and 42 composed of surface models
Create Hereinafter, the denture base model 48, which is a surface model, is created in the same manner as in the above embodiment. The stereolithography data creating means 15 creates NC data according to the denture base model 48. Then, the NC data is transmitted from the management center 51 to the dental clinic 52 or the laboratory through the communication line 55. In the dental clinic 52 or the laboratory, the denture base is manufactured by controlling the stereolithography apparatus 3 as in the above-described embodiment. As described above, in the present embodiment, it is possible to manufacture a denture base by a three-dimensional system and suppress variations in quality. Further, since it is only necessary to equip the management center with expensive three-dimensional CAD / CAM, it is possible to reduce the economic burden on the dental clinic and the laboratory. In each of the above embodiments, the upper jaw partial floor has been described as an example, but the lower jaw partial floor can be manufactured by the same procedure. In addition, when there is a partial floor that mates with the upper and lower jaws, a partial floor model of the upper and lower jaws, which has been occlusally adjusted in advance, is selected from the main body database 6, and the gingiva and palate of the main body model are selected. A denture base model, which is a surface model, may be created by connecting the above and the above-mentioned floor wings, and similarly, in the case of all dentures as well, occlusal adjustment is performed in advance from the main part model database 6 A model may be selected and a denture base model which is a surface model may be created by connecting the gingival part of the main part model, the palate part, and the floor wing part. Further, the denture base thus manufactured is occlusally adjusted and polished to finish. Furthermore, instead of finishing the stereolithographic denture base as it is as a plate denture, a stereolithographic denture base is used as a master model to obtain an impression of this, and wax is poured into this impression to make a wax denture. A floor may be manufactured, and the wax denture base may be replaced with a resin or a metal by a conventional method to manufacture a resin or metal denture base. If a clasp is provided as needed, the jig 23 can be set together with the artificial tooth. Further, in the above embodiment, the case where the artificial tooth is set in the stereolithography apparatus has been described as an example, but the denture base may be formed without setting the artificial tooth, and then the artificial tooth may be bonded to the floor. In this case, the jig and the position adjusting mechanism shown in FIG. 4 can be omitted. In this case, it is preferable that the main part model data registered in the main part model database be a combination of artificial tooth shape data and floor shape data having an artificial tooth fitting recess, and a denture base model In the forming means, the shape data of only the floor having the artificial tooth fitting concave portion is created.

[0007]

The present invention can suppress variations in the quality of the denture base.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of the present invention.

FIG. 2 is a flowchart.

FIG. 3 is a schematic explanatory view showing an optical modeling apparatus.

FIG. 4 is a schematic explanatory view showing a jig and a position adjusting mechanism.

FIG. 5 is a plan view showing a model with an impression.

FIG. 6 is an explanatory diagram showing an occlusion simulation state.

FIG. 7 is a plan view showing a main part model selection state.

FIG. 8 is a plan view showing a state in which a palate portion is formed.

FIG. 9 is a plan view showing a state in which a floor wing portion is formed.

FIG. 10 is a plan view showing a denture base formation state.

FIG. 11 is an explanatory diagram showing a denture base formation state.

FIG. 12 is a perspective view showing a denture base.

FIG. 13 is a block diagram showing another embodiment of the present invention.

FIG. 14 is a flow chart diagram.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Three-dimensional CAD / CAM 2 Measuring means 3 Stereolithography device 6 Main part database 10 Main part model selecting means 14 Denture base forming means

Claims (2)

[Claims] 1. A model according to an impression is measured, a main part model is selected from a database based on the shape data of the model, and denture base shape data is created based on the main part model data and the model shape data, A method for manufacturing a denture base, which comprises controlling a stereolithography apparatus based on the shape data. 2. A model according to an impression is measured, the measurement data is transmitted from a dental clinic or a laboratory to a management center, and the management center creates shape data of a denture base based on the shape data of the model. Manufacture of a denture base characterized in that NC data is created based on the data, the NC data is transmitted to a dental clinic or a laboratory, and a dental prosthesis is manufactured by controlling an optical modeling device in the dental clinic or the laboratory. Method.