JP2000107203A - Manufacture of dental prosthesis - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable a model to deform effectively by registering the models in which a tool axis is inclined at a prescribed angle in a database and adjusting the tooth axis angle of the selected model based on measured shape data concerning the deformation. SOLUTION: Lots of models are grouped for the kind of a tooth and stored in accordance with various specifications in a database 6 and in each model, the tooth axis is previously set at a prescribed standard angle. A model processing part 8 forms a surface model to be the peripheral information of a tooth deficiency part from three-dimensional coordinate value measurement data which are obtained by a measuring means 2 and a margin extracting means 11 extracts a margin line from the surface model of an abutment tooth. A selecting means 9 compares and collates the surface model with the model constituting a crown shape and selects the desired model from the database 6. An articulation simulation means 10 deforms the selected model so as to be adapted at a correlative position against the surface model.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a method for producing a dental prosthesis.

[0002]

2. Description of the Related Art In an aging society in recent years, there is a demand for a method of manufacturing a dental prosthesis that is effective for restoring oral functions. By the way, in the cerebral physiology, the center of masticatory movement occupies a larger area than the motor area of the rest of the body in the lower part of the center of the cerebral cortex, and the limbic system has a center for eating, The higher centers of motor control occupy a larger area in the motor and sensory areas of the jaw and face cortex than in other parts of the body. This indicates that oral function plays a large role in stimulating brain cells, and it is important to restore oral function to a standard level in dental treatment. In order to stabilize the quality of a dental prosthesis, research has been conducted to produce a crown using a three-dimensional system. For example, an impression of an abutment tooth and its surroundings, a mating tooth, and FGP are obtained, a model is manufactured, and the shape of the model is measured by a three-dimensional measurement technique, and the treated tooth and its surrounding data and mating are measured. The data on the side is stored as measurement data in a computer, a three-dimensional measurement shape model is created from the data, and a standard model selected from the database is superimposed on the abutment of this measurement shape model and copied. The model is deformed to conform to the shape and function required in the above, NC data is created from the deformed model, and the NC data is
A device for manufacturing a crown by controlling a C machine tool has been proposed.

[0003]

In the above-mentioned prior art, it is unclear how the model selected from the database is deformed based on the measured shape data, and it has been difficult to put the model into practical use.

Accordingly, an object of the present invention is to provide a method for manufacturing a dental prosthesis that enables effective deformation of a model.

[0005]

According to the present invention, a desired model is selected from a database based on measured shape data, deformed, and machining data is created based on the deformed model. Then, in a method of manufacturing a dental prosthesis by performing NC cutting, grinding or optical shaping based on the processing data, a model in which a tooth axis is inclined at a predetermined angle is registered in the database, and the deformation is selected. Adjusting the tooth axis angle of the model based on the measured shape data.

According to the present invention, a selected model can be effectively deformed based on its surrounding shape.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described below with reference to FIGS. FIG. 1 is an embodiment of an apparatus configured for manufacturing a crown, and is a three-dimensional CAD / CAM1.
Measurement means 2, processing means 3, display 4,
It comprises input means 5. The three-dimensional CAD / CAM 1 includes a database 6 of a model forming a crown with a tooth axis set at a predetermined angle in advance, a measurement data memory 7, a model processing unit 8, a selection unit 9, and an abutment simulation unit 1.
0, a margin extracting unit 11, a margin matching surface forming unit 12, and a processing data creating unit 13. The occlusal simulation means 10 has a relative position / size setting means 14, an interference area determining means 15, a tooth axis adjusting means 16, an enlarging / reducing means 17, and an interference portion deforming means 18. A large number of models are stored in the database 6 according to various specifications, grouped by tooth type, and the tooth axis of each model is set in advance to a standard predetermined angle. In these models, shape data such as a surface model created by a conventional method using three-dimensional CAD based on three-dimensional coordinate value data is stored. The model processing unit 8 creates a surface model as the surrounding information of the tooth defect site from the three-dimensional coordinate value measurement data obtained by the measurement unit 2, and the margin extraction unit 11 extracts a margin line from the surface model of the abutment tooth. . The selection means 9 compares and compares the surface model, which is information on the defect site and its surroundings, with the model constituting the crown shape, and selects a desired model from the database 6. The occlusal simulation means 10 deforms the selected model so as to be compatible with the compared and matched Surfes model at its relative position. The margin matching surface forming means 12 forms a surface between the maximum ridge or the lower part of the deformed model and the margin line to create a crown-shaped surf model that fits the margin line.
The measuring means 2 can use an appropriate device capable of inputting measurement data of the abutment tooth and its surroundings to the measurement data memory 7. For example, when a contact type or non-contact type three-dimensional measuring machine is used, , Take impressions as usual, create models,
The shape of this model is measured by a coordinate measuring machine and stored in the measurement data memory 7. In this case, the measurement data is desirably stored as data obtained by performing a smoothing process by converting the point sequence data into a wire frame. In this embodiment, the crown is operated in an interactive manner with the display contents of the display 4. As shown in FIGS. 2 to 8, the procedure for manufacturing the crown is shown in FIGS. The teeth 22 to 24 on the mating side are measured by the measuring means 2 and input to the measurement data memory 7. Further, information such as the type related to the defect site is input by the input means 5. The model processing unit 8 creates an abutment tooth 19 made of a surf-es model and teeth 22 to 24 as surrounding information from the measurement data. The margin extracting means 11 extracts a margin line 25 from the abutment tooth 19. The selecting means 9 compares and compares the teeth 22 to 24, which are the surrounding information composed of the surf model, with the models in the designated group, and selects a desired model 26. Relative position / size setting means 1 of occlusion simulation means 10
4 indicates the relative positions of the upper and lower jaws 20 and 23 and 21 of the healthy teeth.
Is set based on the occlusal relationship between and the selected tooth axis 2
The relative positions of the model 26 in the seven directions are set based on the surrounding teeth 20 to 24 and the pound's line 28, and the model 26 becomes the contact portion 30 between the adjacent teeth 20 and 21 and the largest protruding portion 29 at this set position. Enlarge or reduce.
In this case, the relative positions of the upper and lower jaws may be adjusted using a positioning portion such as an uneven portion provided in advance to the model. The interference area determination means 15 determines the area of the interference portion 31 between the model 26 and the opposing tooth 22 as shown in FIGS. As shown in FIG. 7, the tooth axis adjusting means 16 determines each interference area while moving the tooth axis 27 in a predetermined range, for example, + and -θ ° in the X and Y directions, and determines the tooth axis 27A at a position where the interference area is the smallest.
Set. The enlarging / reducing means 17 enlarges or reduces the model 26 at this set position, if necessary, such that the model 26 becomes the contact portion 30 between the adjacent teeth 20 and 21 and the maximum protruding portion 29.
As shown in FIG. 7, in the cusp 32 having the interference part 31, the interference part deforming means 18 moves the control point P <b> 1 substantially at the center of the interference part 31 to the position of P <b> 2 which engages with the opposing tooth 22 and moves to the designated range H. Is to be deformed smoothly. As shown in FIG. 8, the margin adapting surface forming means 12 creates a surface 33 composed of a surf model between the maximum ridge portion 29 of the deformed model 26 and the margin line 25. The processing data creating means 13 is a crown model 3 comprising a deformed model 26, a surface 33 and an abutment tooth 19 as shown in FIG.
Processing data is created based on the shape data of 4 and a crown is manufactured by controlling the processing means 3. In this case, the margin matching surface forming means 12 selects, for example, the margin line 25 and the maximum ridge portion 29 of the crown model 26 and forms a surf-es model therebetween. A point corresponding to the margin is selected from the shape data, and a wire frame is formed at this point. Further, the amount of deformation by the occlusion simulation means 10 can be reduced by using a model selected from the database 6 using data obtained by measuring the teeth of the patient before loss. Further, the model forming the crown shape may be formed so as to extend below the maximum protruding portion. Further, the margin matching surface forming means 12 may form the margin matching surface after deforming the lower end shape of the deformed crown model in accordance with the margin line shape. As described above, in the above embodiment, the model selected from the database is effectively deformed by adjusting the tooth axis based on the interference area with the mating side at the relative position with the surrounding shape data. Therefore, a crown having good compatibility can be manufactured. Hereinafter, the second embodiment of the present invention will be described.
An embodiment will be described with reference to FIGS. In this embodiment, the same parts as those in the above embodiment are denoted by the same reference numerals, and the description of the same parts will be omitted. FIG. 10 shows an embodiment of an apparatus configured to manufacture a bridge, and a database 6 registers a model in which a tooth axis is set to a standard angle in advance according to a predetermined dental arch as shown in FIG. . In addition, a missing part corresponding shape forming means 41, a missing part fitting surface forming means 42,
It is basically the same as the first embodiment except that a connecting portion forming means 43 is added. The missing portion corresponding shape means 41 creates the shape of the base corresponding to the missing portion according to the shape of the alveolar ridge at the missing portion. The missing portion fitting surface forming means 42 creates a surface connecting the base shape and the model. The connecting portion forming means 43 connects a plurality of models in the mesio-distal direction. And
In this embodiment, the operation is performed in an interactive manner with the display contents of the display 4. The procedure for manufacturing the bridge is shown in FIGS.
As shown in the figure, the abutment tooth 19 in the oral cavity, the abutment tooth missing portion 44,
The adjacent teeth 20 and 21 and the mating teeth 22 to 24 and 45 are measured by the measuring means 2 and input to the measurement data memory 7. Further, information relating to the defect site is input by the input means 5. The model processing unit 8 creates an abutment tooth 19, an abutment tooth missing part 44, and teeth 20 to 24, 45, which are surrounding information, based on the measurement data. The margin extracting means 11 extracts a margin line 25 from the abutment tooth 19. The selecting means 9 sequentially compares and compares the teeth 20 to 24, 45, which are the surrounding information composed of the surf-es model, with the models in the designated group to obtain a plurality of desired models 26, 26.
A and 26B are selected. Relative position / size setting means 17
Sets the relative position of the upper and lower jaws based on the occlusal relationship between the healthy teeth 21 and 45, and selects the model 2 in the direction of the selected tooth axis 27.
6, 26A, 26B relative position of surrounding teeth 20-24,
45 and based on Pound's line 28,
In this set position, the models 26 and 26B
3 so that the contact portion 30 is formed between 0, 21 and the largest ridge portion 29.
The arranged models 26, 26A, and 26B are collectively enlarged or reduced as a set. The interference area determining means 15 determines the area of the interference part 31 between the models 26, 26A, 26B and their mating teeth 22 to 24. The tooth axis adjusting means 16 determines each interference area while moving the tooth axis 27 in the X and Y directions, for example, by + and -θ, respectively, and sets each tooth axis 27 as the tooth axis 27A at the position where the interference area is the least. The enlarging / reducing means 17 moves the model 26,
26A and 26B are enlarged or reduced so as to form a contact portion 30 between the adjacent teeth 20 and 21 and the largest protruding portion 29. In the cusp having the interference portion 31, the interference portion deforming means 18 moves the control point P1 substantially at the center of the interference portion 31 to the position of P2 which bites the opposing tooth to smoothly deform the designated range H. It is. The margin fitting surface forming means 12 is provided with a surface 33 composed of a surf between the maximum protruding portion 29 of the deformed models 26, 26A and 26B and the margin line 25.
Create The missing portion corresponding shape means 41 creates the shape of the base 46 corresponding to the missing portion according to the alveolar ridge shape of the missing portion. The missing part fitting surface forming means 42 creates a surface 47 connecting the shape of the base part 46 and the model. The connecting portion forming means 43 forms a connecting portion 48 for connecting the plurality of models 26, 26A, 26B in the mesio-distal direction. The processing data creating means 13 is provided with the deformed models 26, 26A, 26B and the surface 3
Processing data is created based on the shape data of the bridge model 49 composed of 3, 47, the connecting portion 48, and the abutment tooth 19,
By controlling the processing means 3, a bridge is manufactured.
As described above, in the above-described embodiment, the model selected from the database is adjusted and the shape of the model is effectively adjusted by adjusting the tooth axis based on the interference area with the mating side at the relative position with the surrounding shape data. Therefore, it is possible to manufacture a bridge having good compatibility. Hereinafter, the third embodiment of the present invention will be described.
An embodiment will be described with reference to FIGS. In this embodiment, the same parts as those in the above embodiment are denoted by the same reference numerals, and the description of the same parts will be omitted. FIG. 18 shows an embodiment of an apparatus configured to manufacture a partial denture base.
Floor outline recognition means 52, palate formation means 53,
Floor wing forming means 54, gingival and tooth connecting means 55,
First embodiment except that a denture base model forming unit 56, an optical molding NC data creating unit 57, a jig model forming unit 58, a crown deformation model forming unit 59, and a cutting NC data creating unit 60 are added. Same as the example. In the database 6, a large number of models are stored grouped by type according to various specifications, and as shown in FIG. 23, the models are arranged in advance with the tooth axis set to a standard predetermined angle in advance. It consists of an artificial tooth model and a gingival part formed with silver teeth. The floor outline recognition unit 52 recognizes the shape of the floor outline in accordance with the surface model. The selection means 9 selects the best matching model from the database 6 based on the surface model. The occlusal simulation means 10 determines the relative position of each artificial tooth and gingival part constituting the model in relation to the model shape data. The palate forming means 53 forms a palate having a predetermined thickness in accordance with the mucosal surface shape of the model in the range of the floor contour recognized by the floor contour recognition means 52. The floor wing forming unit 54 forms a floor wing in accordance with the floor outline recognized by the floor outline recognition unit 52. The connecting means 55 connects the artificial tooth model and the gingival part with the positional relationship determined by the occlusal simulation means 10. The denture base model forming means 56 connects the gingival part, the palate part, and the floor wing part of the model to form a surface model of the partial denture base. In this case, the model of the partial denture base refers to shape model data composed of a floor and artificial teeth or shape model data of only the floor. The optical shaping NC data creating means 57 creates data for controlling the optical shaping apparatus 3. The jig model forming means 58 creates a crown model in the arrangement state determined by the occlusal simulation means 10. Interference part deforming means 18
Creates a crown deformation model based on the interference region of the positional relationship determined by the occlusal simulation means 10. Cutting NC
The data creating means 60 creates data for controlling the processing means 3. The database 6 manufactures a large number of standard dentures in which artificial teeth are arranged and teeth are formed according to clinical cases.
This is measured by the above-described three-dimensional measuring device to obtain three-dimensional coordinate value data, and a three-dimensional C
Shape data such as a surface model created by a conventional method using AD is stored. In this case, the direction of the tooth axis is set in the artificial tooth model. The optical shaping apparatus 51 is shown in FIG.
0, a Z-axis elevator 63 is provided in a tank 62 containing a photo-curable resin 61 so as to be able to move up and down, and XY
The laser head 65 of the operation axis 64 is configured to irradiate a laser 66 such as an ultraviolet ray from the laser head 65.
The table 67 of the third processing means 3
The jig 68 machined in the above is detachably attached via a position adjusting mechanism 69. FIG. 21 shows the position adjusting mechanism 69.
An artificial tooth 70 is fitted into a jig 68. The jig 68 is stored in a case 71, and the case 71
An axial rail 72, a feed screw 73, and a motor 74 are provided through a frame 75, and a Y-axis rail 76, a feed screw 77, and a motor 78 are provided through a frame 79. Rail 80, feed screw 81,
The motor 82 is provided via a frame (not shown). The jig 68 and the position adjusting mechanism 69 described above are configured to be individually adjustable corresponding to, for example, the front teeth, the left molars, and the right molars. And the motors 74, 7
8, 82 are controlled in accordance with the movement position of the main part model adjusted by the occlusal simulation means 10. In the present embodiment, the operation is performed in an interactive manner with the contents displayed on the display 4. For example, the partial denture base 9 of the upper jaw shown in FIG.
The procedure for manufacturing 7 is as follows: the upper and lower jaw models 84 and 85 are created based on the impression shown in FIG. The measurement is performed and the three-dimensional coordinate value data is input to the measurement data memory 7. In addition, the input means 5 is used to input the type of the partial denture base, the location of the missing tooth, and the size and type of the artificial tooth to be used. Next, the model processing unit 8 creates model models 87 and 88. Next, the floor outer shape recognition means 52 determines the outer shape of the floor according to the shape data of the survey line 86 in the model model 87.
Next, the selecting means 9 sequentially reads out a plurality of models in the group selected based on the information on the partial denture base, and matches the lower jaw model model 88 which is the remaining teeth with the occlusal ridge shape by the occlusal simulation means 10. Of the best matching model 89
Is selected, and the position of the model 89 is determined. This model 8
9 comprises at least an artificial tooth 90 and a gingival part 91. The relative position / size setting means 14 and the interference area determination means 15 perform the same settings as in the above embodiment. Connecting means 5
5 connects the artificial tooth model 90 and the gingival part 91 in the positional relationship determined by the occlusal simulation means 10. The palate forming means 53 forms a palate 92 having a predetermined thickness in accordance with the mucous membrane surface shape of the model in the range of the floor contour recognized by the floor contour recognition means 52. The floor wing forming means 54 forms the floor wing 93 in accordance with the floor contour recognized by the floor contour recognition means 52. The denture base model forming means 56 connects the gingival part 91 of the model 89, the palate part 92, and the floor wing part 93 to form a denture base model 94. The optical shaping NC data creating means 57 creates NC data for controlling the optical shaping device 51 according to the denture base model 94. The jig model forming means 58 forms a crown model whose tooth axis has been adjusted based on the positional relationship determined by the occlusal simulation means 10, and performs cutting N
NC data is created by the C data creation means 60 according to the model. The interference section deforming means 18 deforms the same as in the above embodiment, forms a deformed model thereof, and creates NC data according to the model by the cutting NC data generating means 60. Then, a crown-shaped recess 96 is formed on a block 95 made of a material which is easy to be processed by the processing means 4 in accordance with the jig model.
Is cut to produce a jig 68 shown in FIG. In addition, the table 67 of the Z-axis elevator 63 of the optical shaping apparatus 51 includes:
A jig 68 in which artificial teeth 70 are arranged is attached to the recess 96 in the same manner as the denture base model, and the jig 68 is set to a set position under the control of the position adjusting mechanism 69. In this state, the laser 66 is sequentially irradiated and the table 67 is lowered, whereby the denture base 97 is manufactured. In this case, since the laser is irradiated to the set artificial teeth, the interdental papilla between the artificial teeth is also molded with a clear resin. Next, the manufactured denture base is set on the processing means 3, and the cusp of the artificial tooth is cut so as not to interfere according to the deformed state of the interference portion of the crown deformed model. Thereafter, polishing and finishing are performed to complete the process. As described above, in the above embodiment, the model selected from the database is effectively deformed by adjusting the tooth axis based on the interference area with the mating side at the relative position with the surrounding shape data. Therefore, it is possible to manufacture a partial denture base having good compatibility. When a partial floor corresponding to the upper and lower jaws is required, an upper and lower jaw partial floor model that has been adjusted in advance from the database 6 is selected, and the gingival part, the palate part, and the floor of the model are selected. What is necessary is just to connect a wing part and create a denture base model. When a clasp is provided as required, the clasp may be set together with the artificial tooth on the jig. Further, in the above embodiment, the case where the artificial tooth is set in the stereolithography apparatus has been described as an example.
Instead of setting the artificial teeth, the floor portion may be stereo-molded, and then the artificial teeth may be adhered to the floor. In this case, the jig and the position adjusting mechanism shown in FIG. 4 can be omitted. In this case, in the denture base model forming means,
The shape data of only the floor having the artificial tooth fitting concave portion is created. Further, the denture base may be manufactured by cutting or grinding without using stereolithography. Further, the interference portion deforming means may be provided as needed. Hereinafter, a fourth embodiment of the present invention will be described with reference to FIGS. In this embodiment, the same parts as those in the above embodiment are denoted by the same reference numerals, and the description of the same parts will be omitted. FIG. 27 shows an embodiment of an apparatus configured to manufacture a denture base, which includes an occlusal floor measurement data memory 101, an occlusal floor model processing unit 102, an alignment reference point extracting unit 103, a relative position setting unit 104, and an alignment reference plane. The third embodiment is substantially the same as the third embodiment except that the forming means 105 is added, the tooth axis adjustment is performed according to the alignment reference plane instead of the interference area, and the determination of the interference area is performed only to deform the interference section. It is. The arrangement reference point extracting means 103 recognizes the arrangement reference points and linearly connects them to create a wire frame. The arrangement reference plane forming means 105 connects the arrangement reference lines of the upper and lower jaws as shown in FIGS. The palate forming means 53 cuts the floor of the occlusal floor model. The floor wing forming means 54 cuts the floor wing of the occlusal floor model. In this embodiment, for example, in order to manufacture the upper and lower jaw floors 106 and 107 shown in FIG. 35, upper and lower jaw models 108 and 109 having the impression shown in FIG.
And the three-dimensional coordinate value data is input to the measurement data memory 7. In this case, the arrangement reference point 110 is input by manual operation, or the arrangement reference point is formed in a convex or concave shape at the time of model creation so that it can be recognized after shape measurement. Next, as shown in FIG. 30, the occlusal floors 111 and 112 created on the model are measured, and the three-dimensional coordinate value data is input to the occlusal floor measurement data memory 101. Further, information relating to the denture base to be manufactured is input by the input means 5. Next, the model processing unit 8 creates model models 113 and 114 from the measurement data. Similarly, the occlusal floor model processing unit 102 creates occlusal floor models 115 and 116 from the measurement data. Arrangement reference point extracting means 10
3 recognizes the arrangement reference points 110 shown in FIG. 29 and connects them linearly to form an arrangement reference line 11 made of a wire frame.
7, 118 are created. Next, the model selecting means 9 sequentially reads out a plurality of models in the group selected based on the information on the denture base, and fits the models 119 and 12 which are most suitable.
0 and the relative position setting means 104 selects the model 11
Determine the position of 9,120. This model 119,12
0 has at least a crown portion and a gingival portion. The relative position setting means 104 determines the positions of the upper and lower jaw model models 113 and 114 and the occlusal floor models 115 and 116 by using the occlusal floor model 1.
It is determined based on the shape of the occlusal ridge 121 of 15,116,
At this position, the relative position is determined while enlarging or reducing the upper and lower jaw models 113 and 114 based on the shapes of the occlusal floor models 115 and 116. Arrangement reference plane forming means 10
5 is an alignment reference line 117, 1 as shown in FIGS.
18 and the alignment reference plane 1 based on the shape of the bite ridge 121.
22 is formed. The tooth axis adjusting means 16 includes an alignment reference plane 122.
Is adjusted so that the tooth axis 27 of each crown model is adjusted to the above.
The connecting means 55 connects the gingival model and the crown model. The palate forming means 53 is an occlusal floor model 115,11
6 is cut from the alveolar portion 121A, and the floor wing forming means 54 is connected to the occlusal floor models 115 and 116.
Is cut from the gingival part. The denture base model forming means 56 creates denture base models 123 and 124 by connecting the model with the tooth axis adjusted, the floor and the floor wing. The stereolithography NC data creating means 57 is a denture base model 123, 12
In step 4, data for controlling the optical shaping apparatus 51 is created.
Thereafter, the denture base is manufactured by the same operation as in the third embodiment.
As described above, in the above embodiment, the model selected from the database is effectively modified by adjusting the tooth axis based on the occlusal floor model,
A partial denture base with good compatibility can be manufactured. The present invention is not limited to the above embodiments, and various modifications can be made within the scope of the present invention. For example, although the shape data has been described using the surf model, it may be a solid or the like. The FGP impression may be used as needed. The adjustment range of the tooth shaft may be appropriately selected. Further, an appropriate method is possible such that the deformation of the interference portion is performed only by moving the control point without specifying the range H. Further, a CT scan or the like may be used as the coordinate measuring machine. Also, instead of measuring a model, Japanese Patent Application Laid-Open No. 4-504219,
Alternatively, the inside of the oral cavity may be directly measured as in JP-A-54251 and JP-A-7-117389. In addition, the tooth axis movement range and the movement method may be appropriately selected at the time of tooth axis adjustment by the tooth axis adjustment means. It may be. Deformation refers to enlargement, reduction, rotation, and the like. In the production of a prosthetic crown, Japanese Patent Laid-Open Publication No.
A gap for the adhesive may be provided on the inner surface of the crown prosthesis by an appropriate method such as that disclosed in Japanese Patent No. 377. The enlargement / reduction means may enlarge or reduce only the mesio-distal direction, or may finely adjust the position set by the tooth axis adjustment means as needed. The method of positioning the upper and lower jaw measurement data may be appropriately selected. For example, three positioning sections may be provided on the upper and lower jaw plaster models, and measurement may be performed including the positioning sections. A dedicated jig such as 178122 may be used.

[0007]

According to the present invention, it is possible to provide a method for manufacturing a dental prosthesis which enables an effective change of a model.

[Brief description of the drawings]

FIG. 1 is a block diagram of a first embodiment.

FIG. 2 is a flowchart.

FIG. 3 is a schematic explanatory view showing a tooth axis direction of a model.

FIG. 4 is a diagram illustrating the relationship between a model and surrounding shape data.

FIG. 5 is a diagram illustrating the relationship between a model and surrounding shape data.

FIG. 6 is a diagram illustrating the relationship between a model and surrounding shape data.

FIG. 7 is a schematic explanatory view showing tooth axis adjustment and deformation of an interference portion.

FIG. 8 is a schematic explanatory view showing a state of forming a margin matching surface.

FIG. 9 is an explanatory diagram showing crown shape data.

FIG. 10 is a block diagram showing a second embodiment of the present invention.

FIG. 11 is a flowchart.

FIG. 12 is a schematic explanatory diagram showing a registration state of a model.

FIG. 13 is a diagram illustrating the relationship between a model and surrounding shape data.

FIG. 14 is a schematic explanatory view showing a shape corresponding to a defective portion.

FIG. 15 is a diagram illustrating the relationship between a model and surrounding shape data.

FIG. 16 is an explanatory diagram showing a margin matching surface and a missing portion matching surface.

FIG. 17 is a perspective view showing shape data of a bridge.

FIG. 18 is a block diagram showing a third embodiment of the present invention.

FIG. 19 is a flowchart.

FIG. 20 is a schematic explanatory view showing an optical shaping apparatus.

FIG. 21 is a schematic explanatory view showing a jig and a position adjusting mechanism.

FIG. 22 is a plan view showing a model having an impression.

FIG. 23 is a plan view showing a model.

FIG. 24 is an explanatory view showing a denture base model.

FIG. 25 is a plan view showing a denture base.

FIG. 26 is a perspective view of a jig.

FIG. 27 is a block diagram showing a fourth embodiment of the present invention.

FIG. 28 is a flowchart.

FIG. 29 is a plan view showing a model with an impression.

FIG. 30 is a plan view showing an occlusal floor.

FIG. 31 is a plan view showing a model.

FIG. 32 is an explanatory diagram showing a relative position setting state.

FIG. 33 is an explanatory diagram showing a relative position setting state.

FIG. 34 is an explanatory diagram showing a denture base model.

FIG. 35 is a plan view showing a denture base.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 3D CAD / CAM 2 Measuring means 3 Processing means 6 Database 9 Selection means 16 Tooth axis adjustment means

Claims (1)

[Claims] 1. A desired model is selected from a database based on measured shape data, deformed, and processing data is created based on the deformed model. NC processing, grinding, or optical processing is performed based on the processing data. In the method of manufacturing a dental prosthesis by performing a shaping process, a model in which a tooth axis is inclined at a predetermined angle is registered in the database, and the deformation adjusts a tooth axis angle of the selected model based on measured shape data. A method for producing a dental prosthesis, comprising: