JPH11333667A - Profile machining method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To increase an area of a tool in contact with a lump object and shorten machining time by machining the lump object using a side face part of the tool. SOLUTION: An external shape 17 in which an approximate shape of a crown model is projected on a porcelain square column block 15 on an XY plane is ground by a side face of a diamond bar tool 19. When a large amount is ground, an interval of a profile 18 is widened, and when a small amount is ground, the interval of the profile 18 is reduced so that cutting operation is done by turning and reciprocating around a block 15. After that, the block 15 cut up to the external shape 17 is rotated by 90 deg. around X-axis. As for this rotation amount, it is preferable that it is rotated per 90 deg.. The external shape in which the approximate shape of the crown model is projected on XZ plane is formed by cutting plural times.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for performing automatic measurement by computer control and automatic processing based on the measurement information, and by using an automatic measurement and automatic processing means represented by a CAD / CAM apparatus, the precision is improved. The present invention relates to a system for measuring and manufacturing a dental prosthesis, other dental materials, medical materials, various imitations, and a workpiece that is the same, similar, or corresponding to an object to be measured.

[0002]

2. Description of the Related Art When a lump is cut or ground by a CAD / CAM apparatus or an NC machine tool, there are a roughing step and a finishing step. The former roughly processes a block of a certain size up to approximation of a target shape. At that time, a thick cutting or grinding tool is used. The latter is
After roughing, it is processed to the desired shape. In the processing method in the case of performing the above steps, the processing has been performed in such a manner that the block is dug down with a cutting or grinding tool in order from the upper surface of the lump. This method has intensively used only the tip of a cutting or grinding tool such as an end mill or diamond bar. In the case of a general NC machine tool or CAD / CAM device, the workpiece and the workpiece are separately installed, or the measuring device and the processing device are separated. When producing a dental prosthesis, an abutment tooth is impressed and an abutment tooth plaster model is produced. On top of that, the shape of the dental prosthesis was created with wax, and replaced with metal or the like by casting. During this time, labor and man-hours were required, and the quality varied. Dental prostheses (especially crowns) on NC machine tools
Is being researched and developed for practical use. In the process of manufacturing the dental prosthesis, a dental prosthesis model is made of wax or resin, the shape of the dental prosthesis model is measured faithfully, and finished by cutting or grinding with an NC machine tool. Although there is only an inlay, there is a system in which a tooth on which a cavity has been formed is photographed by a camera, three-dimensional shape data is created in gray scale, and a cutting process is performed.

[0003]

In the conventional method, when cutting or grinding a square or cylindrical lump, a cutting or grinding tool is dug down from the upper surface of the lump in order. Therefore, only the tip of a cutting or grinding tool such as an end mill or a diamond bar is used, and the tool is severely damaged. Therefore, the life of the tool is short. Furthermore, the blades and diamond grindstones attached to the parts other than the tip were not used, resulting in waste. In addition, since the amount of engraving is concentrated on one point of the tool, processing time was required. Since the workpiece and the workpiece are separately installed, there is a problem that the workpiece and the measured data are shifted unless the position of the workpiece is accurately reproduced. In particular, when reproducing a three-dimensional shape, the workpiece and the workpiece are sometimes rotated, and the problem of alignment of the rotation is added, which further complicates the measurement. In order to eliminate this, it has been necessary to accurately measure the position of the object to be measured and to install the object to be processed, and time and labor have been expended. Further, when measurement and processing are performed in the same work area, dirt due to processing may affect the measurement.
In the field of dentistry, the production of dental prostheses required almost manual labor and was delayed in mechanization. Only recently have dental CAD / CAM devices been developed. But,
When performing machining, there is a problem that time and running costs are extremely high because of the application of the above method. In addition, a three-dimensional shape measurement model must be manufactured with high accuracy using wax or resin. In other words, if the three-dimensional shape measurement model is bad, a poor dental prosthesis is obtained.
In particular, producing a dental prosthesis with a good margin line and good conformity requires a high level of skill in a dental CAD / CAM apparatus and a casting method, and requires much labor and time. In addition, stable quality supply was also an issue. In the case of gray scale, the accuracy and resolution of the camera are not enough to withstand the accuracy of the dental prosthesis. As a result, the spread of mechanization in the dental field is also a factor behind the delay.

[0004]

SUMMARY OF THE INVENTION The present invention makes it possible to effectively use not only the tip of a cutting or grinding tool such as an end mill or a diamond bar, but also a blade of a cylindrical portion (side portion) or a diamond grindstone. .

[0005] As a method, first, a cutting or grinding tool is approached from the outside of a lump on the XY plane, and rough processing is performed to a contour at a cylindrical portion (a side portion of the tool) of the tool. Next, the lump is rotated by 90 ° about the X axis, and the outline is similarly roughened on the XZ plane. Finishing is done in the same way. However, depending on the desired shape,
In some cases, the finishing process is performed on the XY plane, and the finishing process is performed in the same manner by inverting the X axis by 180 °.

[0006] According to this method, the entire outer shape obtained by projecting the processing shape on the XY plane can be processed by the cylindrical portion of the cutting or grinding tool. Further, if the object is rotated by 90 ° on the X axis and becomes possible on the XZ plane in the same manner, an intended object can be obtained only by the process depending on the shape. In addition, if the lump that has been rough-processed by this method is to be subjected to finish processing according to the final target shape, the tool tip will be mainly used in the finishing stage, and rough processing and finishing Processing can be performed continuously without changing tools during processing. By separating the work area for measurement and processing, measurement can be performed in a clean area. The positioning of the workpiece and the workpiece can be solved by installing them on the same axis. The same can be said of the fact that the rotational axis precision, which is a particular problem, exists on the same axis.

Creation of three-dimensional shape data such as cutting and grinding is performed by using an abutment gypsum model manufactured from a dental impression. As the current dental technicians are doing, extract the necessary part of the abutment gypsum model, and place the gingival side below that line in the Z-axis direction so that the margin line of the abutment gypsum model at that part is easy to see. Trim to overhang on top. On the trimmed abutment tooth plaster model, a three-dimensional shape measurement model is created from the largest protruding part to the occlusal surface using wax, instantly polymerized resin, etc. according to the size and shape of the adjacent teeth and opposing teeth.

[0008] From the maximum ridge to the margin line, the ridge is appropriately formed or not formed so as to overhang at the ridge. After that, the abutment gypsum model and the measurement model with the abutment gypsum model are measured by a three-dimensional shape measuring device. The overhang part of the data obtained by measurement is deleted from the data. The data can be deleted by a method in which the margin line or the largest ridge line processes the two-dimensional contour in the Z-axis direction and deletes the data below those lines, or the Z line having no moving amount in the X-axis and Y-axis directions. There is a method to delete only the data moved in the axial direction. The data obtained by measuring the abutment tooth plaster model and subjected to margin line data processing were converted into male and female and mirror, and used as the inner surface shape data of a dental prosthesis such as a crown. At that time, the inner surface shape data
There is a case where offset is performed in the normal direction in consideration of the cement portion. The data and the data obtained by processing the data of the maximum prosperity line were prepared, and the portion of the maximum prosperity was surfaced from the margin line to obtain three-dimensional shape data of one dental prosthesis. A three-dimensional shape measurement model was created in the oral cavity using instant polymerized resin, etc., and in the same manner as above, three-dimensional shape data was acquired and processed, and a dental prosthesis was made using the inner surface shape data This is a more preferable three-dimensional shape measurement model. In this case, the three-dimensional shape measurement model produced in the oral cavity is bitten by the patient to a certain extent, thereby obtaining an ideal occlusal surface shape. Therefore, it is possible to provide a dental prosthesis that does not make the patient feel uncomfortable.

[0009] It is also possible to adopt a method in which the preparation of the three-dimensional shape measurement model is omitted. A database of a general three-dimensional shape model is prepared in advance, processed on a computer, and made into three-dimensional shape data of one dental prosthesis using the inner surface shape data obtained by the above method. It is a method of doing. Furthermore, in this field, a mass of wax or resin containing the minimum necessary information such as contact points, motion paths, prosperity, etc. in the oral cavity or on a model is produced and measured, and a prepared tooth profile database is measured in three dimensions. A method of processing and inserting a deformed shape to fit the data is also presented. In the case of coping of a dental prosthesis, it is performed only with the trimmed abutment plaster model. The trimmed abutment plaster model is measured with a three-dimensional shape measuring device, and data processing is performed on the overhang portion below the margin line. The data is used as the inner surface shape data in the same manner as described above. Further, the data is extracted from a margin line above a certain height, and a certain amount is offset in the normal direction. The data and the margin line are covered to form outer surface shape data. These inner and outer surface shape data become coping shape data. Processing data can also be created for denture bases in the same manner as this coping.

The material of the lump is ceramics, metal, synthetic resin, wood, and other materials that can be subjected to three-dimensional processing by a three-dimensional processing machine tool, and is not particularly limited as long as it can be processed. The tool is not particularly limited as long as it can process an end mill, a diamond bar, a grindstone and other massive objects, that is, a workpiece. The same applies to the processing plane. For example, the same axis is not particularly limited as long as the coordinate axes are the same according to a rectangular coordinate axis, a cylindrical coordinate axis, a spherical coordinate axis, and a certain functional expression. In addition, the abutment tooth model, the material of the workpiece and the workpiece, the method of manufacturing the workpiece, the method of measuring or acquiring the three-dimensional shape, the offset method and amount of the processing method and data, and the overhang direction are not particularly limited. .

[0011]

By using a cylindrical portion (a side portion of a tool) of a tool (cutting or grinding tool) to process a lump, the area of the tool corresponding to the lump increases. Thereby, the machining time is shortened and the life of the tool is extended. In addition, the tools used for roughing and finishing were separated, but the roughing and finishing were separated from the side of the tool, and the finishing was separated from the tip of the tool. No, it can be processed. Separate measurement area and processing area,
By installing the workpiece and the workpiece on the same axis,
The influence of the measurement due to the contamination of the processing is eliminated, and the alignment is simplified. A dental prosthesis with a good fit of the abutment teeth and a matching margin line can be produced simply and in a short time without depending on human skill.

[0012]

Embodiment 1 A cutting apparatus used as the present invention is based on an NC machine tool used as a machine for processing a die or the like. With this device, the crown of the dental prosthesis was ground. However, NC machine tools for cutting general dies and the like are large in size, and the cutting accuracy is not suitable for medical materials or dental materials. Therefore, the cutting machine tool 3 shown in FIG. 1 has a reduced size and improved cutting accuracy. The NC machine tool 3 in FIG. 1 is divided into a three-dimensional shape measurement area 4 and a three-dimensional machining area 5. In the three-dimensional shape measurement area 4, a three-dimensional shape measurement probe 6 with a contact element 8 is installed. The three-dimensional shape measurement probe 6 is mounted on an X-, Y-, and Z-axis table, and can move three-dimensionally. An AC servomotor with an encoder was used for the power of each shaft. In the three-dimensional processing area 5, a spindle motor 7 is installed. Similarly to the three-dimensional shape measurement area 4, the spindle motor 7 can move three-dimensionally. The operation was controlled by connecting the personal computer 2 to the NC machine tool 3. Furthermore,
A water injection nozzle 32 was provided, and the three-dimensional processing area 5 was waterproofed for the purpose of cooling and removing processing waste from the workpiece. A jig 10 for mounting the measurement model 11 in the three-dimensional shape measurement area 4 and a jig 9 for mounting the workpiece 15 in the three-dimensional processing area 5 are internally connected, and are encoders used for powering the respective shafts. The jigs 9 and 10 can be rotated by an attached AC servomotor. When the measured data is processed as it is, it is processed into a mirror-inverted shape with the measurement model 11. Therefore, the data once measured is mirror-reversed on the X axis and the Y axis by the
Data is sent to the machine tool for processing.

A crown model 11 is prepared on a gypsum model used for dental treatment with an instant polymerization resin, and a measurement model rib 12 capable of positioning measurement with an adhesive.
And installed in the above apparatus. The crown model 1
Sample No. 1 was measured by a three-dimensional shape measuring probe 6 and processed by a personal computer 2 as measurement data. In addition, the personal computer 2 processed the measurement data into grinding data. The grinding data is two types of data, namely, rough processing data for processing from a lump to approximation of a target shape and finish processing for processing from rough processing to a target shape. In order to grind the crown, porcelain, which is actually used for dental prostheses, was formed into prismatic blocks and prepared. The porcelain prism block 15 was installed in the apparatus in the same manner as the measurement model 11 for three-dimensional shape measurement. The grinding method is performed by flowing grinding data prepared by the personal computer 2 to the cutting machine 3. The grinding process is divided into roughing and finishing. Φ2mm as a rough machining tool,
A φ1 mm diamond bar tool is used for finishing.

The rough working is performed by the working method of the present invention. 2, 4 and 5 are views of the block to be cut as viewed from above, and FIG. 3 is a view as viewed from the side. The numbers assigned to the blocks may be different but are the same. Outline 1 in which the approximate shape of crown model 11 is projected on porcelain prism block 15 on the XY plane shown in FIG.
7 (indicated by the dotted line) was ground on the side surface of the diamond bar tool 19 having a diameter of 2 mm. Numeral 18 shows the cutting state as a contour on a line. One contour of the contour 18 indicates one cut, and indicates a state in which the cut changes over time in a plurality of cuts sequentially from the outside to the inside. The interval between contours and the number of cuts indicated by that contour are:
It is determined by comparing the measured data and the size of the cutting block at the stage before cutting, and when cutting a large amount, the interval is widened, and the small part is set so as to reduce the interval while the block is set. The cutting operation is performed in a reciprocating manner while making a round around the periphery. In addition, as shown in the figure, it is preferable that the contour makes a round trip so as to reciprocate without ending in the middle, but the contour is not limited to this, and the contour may stop and return in the middle. . This is suitable when the difference between the model and the block has a large difference between the parts and it is not necessary to make a round. Between contours,
According to the above-described control, the range of 0.01 mm to 2 mm is preferable. However, if the material is, for example, a porous material, it is appropriately selected according to the state of porosity, shape, and the like. Then, the block 22 cut to the outer shape 17 shown in FIG.
As shown in FIG. 4, it was rotated 90 ° about the X axis. The rotation amount is preferably rotated every 90 °, but is not limited as long as the contact of the processing surface with the processing tool is good, and the rotation amount is appropriately adjusted. The outer shape 23 (indicated by a dotted line) where the approximate shape of the crown model is projected on the XZ plane is cut a plurality of times as shown in FIG.
Formed. Reference numeral 24 denotes a contour formed by one cutting. As shown in FIG. 1, cutting is performed from the outside to the inside, and the distance between the contours is preferably 0.01 mm to 2 mm, but is appropriately selected as described above. After roughing the XZ plane by the above-described grinding, the wafer was rotated by 90 ° about the X axis. FIG. 5 shows the state after rotation. FIG. 5 shows an abutment tooth surface. The abutment tooth surface side (inner surface) of the crown model 11 was ground on the contour line 21 to complete the roughing. One contour line 1
It is formed by one cutting, and the interval is preferably
The distance is 0.01 mm to 2 mm, and the interval is not limited, and is appropriately selected according to the material, for example, the state of porosity, shape, and the like in the case of a porous material. If the interval between contour lines that form the contour is large, the surface is rough, and if it is small, the surface is fine, so it is preferable that the surface is fine. An interval of about 1 mm is preferred. Replace the φ2mm diamond bar tool with a φ1mm diamond bar,
Finishing of the tooth surface side (inner surface) of the abutment of the porcelain crown was performed by a general method. One layer from the approximate shape to the target shape was ground, and then the object to be cut (porcelain prismatic block) was inverted by 180 ° about the X axis to finish-grind the occlusal surface of the crown. The finished crown was removed from the apparatus, the ribs were cut off by hand, and hand-polished to complete.

In the case of performing the roughing method in which the diamond bar tool is dropped downward from the normal upper surface in order, it takes about 4 hours. Also, only a few roughing operations could be performed with one diamond bar tool. In the case of performing the roughing method by effectively using the processing surface of the processing tool as in the present invention, the processing was completed in about one hour. Also, 1
Four to five grinding operations were completed with the diamond bar tool. Conventionally, the work area was cleanly cleaned each time measurement was performed. However, as shown in FIG. 1, the measurement area 4 and the processing area 5 were separated, so that it was not necessary to clean the work area for each measurement. In addition, the measured object and the work are placed coaxially, and the rib stopper 33 for adjusting the amount of rib to be inserted into the jig for each can ensure the positioning, reproducing the three-dimensional shape of the crown model. did it.
It should be noted that the present invention is not limited to the example as long as it is performed on the side surface of the processing tool up to the target shape in accordance with the contour.

[0016]

Example 2 The apparatus used in Example 1 was used to grind an inlay of a dental prosthesis from a porcelain prism block. It is shown in FIGS. 6, 7 and 8 (a) (b). An inlay model was prepared using an instant polymerization resin on a plaster model used for dental treatment, and grinding data was prepared in the same manner as in Example 1. Φ3mm and φ1 that can be used for both roughing and finishing of porcelain prism block 25
A diamond bar tool 31 having a diamond grindstone having a diameter of 1 mm was installed. A diamond bar tool 3 is used to project up to the outer shape 26 in which the approximate shape of the inlay model is projected on the XY plane.
Contour processing was performed on the cylindrical portion (side surface portion) of the thick part having a diameter of φ3 mm. The distance between the contours of the contour 27 in the contour processing of the present embodiment is preferably 0.01 mm to 3 mm.
For example, if the material is a porous material, the material is not limited to this range and is appropriately selected according to the porosity, the shape, and the like. Thereafter, the porcelain prism block 28 was rotated 90 ° about the X axis. Grinding was performed in the same manner up to the outer shape 29 (indicated by a dotted line) where the approximate shape of the inlay model was projected on the XZ plane. Reference numeral 30 denotes a contour formed by one cutting. Contour 3
The contour interval of 0 is 0.01 mm to 3 mm, and a material such as a porosity or a shape of a porous material is appropriately selected.

Next, before proceeding to the finishing processing, the porcelain prism block subjected to the rough processing was reversely rotated by 90 ° about the X axis so as to be on the XY plane before the rough processing. This state is shown in FIG.
(B). One layer from an approximate shape to a target shape was ground in the same manner as a general finishing process. Thereafter, the object to be cut (porcelain prism block) was inverted by 180 ° about the X axis, and the back side of the inlay was finish-ground. What was used for the finishing processing at this time was processing using a φ1 mm thin portion of the diamond bar tool 31. The finished inlay was removed from the device, the ribs were cut off by hand, and polished by hand to complete.

When processing this inlay, it can be processed in the same manner as described above using only a φ1 mm diamond bar tool. However, this diamond bar tool 3 having both φ3 mm for roughing and φ1 mm for finishing
When using No. 1, since a large amount of grinding could be performed at the time of roughing, the grinding was completed in about half the time. Further, by performing the method according to the present invention, it is possible to continuously perform from roughing to finishing. The shape is not limited to the example as long as the processing up to the target shape is performed on the side surface of the processing tool in conformity with the contour and the processing can be performed with one processing tool.

[0019]

Example 3 Using the apparatus of Example 1, the shape of the abutment tooth plaster model and the shape of the incomplete occlusal surface wax model were used.
A dental prosthesis crown was made. An impression was taken from the oral cavity of the patient, and an abutment tooth plaster model was raised. As shown in FIG. 9, an abutment gypsum model 34 was prepared by trimming 35 a gingival portion below a margin line 36. FIG. 10 shows a wax model 37 prepared on the trimmed abutment gypsum model according to neighboring teeth and opposing teeth. At that time, in the usual wax-up, the crown shape is produced by paying attention to the important margin line and matching, but in the case of the present invention, if the underside of the maximum protruding portion 38 is overhanging, It may be in such a state.

Surface Measurement of Model FIG. 11 shows a three-dimensional shape measurement of the wax model 37. Abutment tooth 34 with wax model 37
Is set on the fixed adapter 40, and the rib 41 of the fixed adapter 40 is attached to the mounting jig 10 in the measurement area 4 of the apparatus of FIG.
And fixed. The contact element 8 of the device of FIG. 1 is run on the surface 39 of the wax model 37 and the X, Y
And Z coordinate points were obtained. The shape of the wax model 37 below the largest protruding portion 38 is not acquired because it is overhanging, and is acquired as a shape obtained by extending the contour of the largest protruding portion 38 downward. At that time, the personal computer 2 is set so that the contact element 8 does not hit the fixed adapter 40, and when the contact element 8 falls on the lower limit line 43, XY is set.
Escape in the plane direction. Then wax model 3
7 was removed, and the shape of the surface 42 of the abutment tooth plaster model 34 was measured in the same manner. It is shown in FIG. Also in this case, the lower side of the margin line 36 is trimmed 35, and due to the overhang state, that is, the protrusion of the margin line,
The measurement probe 8 is not in contact with the trimming portion, and data cannot be obtained. Therefore, similarly to the surface 39 of the wax model 37, the surface 42 shape data of the abutment gypsum model 34 is used. FIG. 13 shows the surface shape 42 data.

Processing of Measurement Data Three-dimensional shape data is created from data obtained by measuring each shape. FIG. 14 shows a method of processing data obtained by measuring the shape of an abutment tooth plaster model. The shape data in which the margin line 36 of the abutment tooth plaster model 34 is overhanged below the margin line 36 is data that has not moved in the X and Y axis directions and has moved in the Z axis direction. The boundary line between the data moving in the X, Y and Z-axis directions and the data moving in the Z-axis direction without the movement amount in the X- and Y-axis directions becomes a margin line 36, and the boundary line, ie, the margin Line 36
Data below the Z axis is deleted. The remaining data becomes the abutment shape data.

Thereafter, the upper data is offset by 50 μm in the normal direction from the boundary line, that is, the portion of the line 46 at a certain height from the margin line 36, and the data below the line 46 is offset from the lines 46 to 36. Data 45 was prepared by reducing the amount and connecting to line 36.

At this time, the certain height is the margin line 3
6 to 1.0 mm. Further, the offset surface tension data 45 was converted into male and female to obtain crown inner surface shape data. The purpose of the offset is to make the crown easier to set smoothly, and also because of the space in the cement layer where the crown will coalesce. Also, the escape of the machining tool is taken into consideration. Further, crown outer surface processing data processing is performed in the same manner as described above. This offset value is determined by the amount of the adhesive, the amount of ease of setting, and the like, and is preferably in the range of 20 μm to 100 μm, and the curve obtained based on the offset value and the margin line is as follows:
It is preferable to determine a smooth curve such as a spline curve or a Bezier curve, but the present invention is not limited to this. FIG. 15 shows the surface shape data 39 of the wax model 37. The data below the Z-axis from the largest ridge 38 was deleted. The method of deleting data is the same as described above. The remaining occlusal surface shape data 47 and inner surface shape data 49 were synthesized. In the synthesis, the alignment between the occlusal surface shape data 47 and the inner surface shape data 49 was based on the installation position of the abutment plaster model 34. After that, a surface 48 is formed based on the surface data from the largest protruding portion 38 to the margin line 36 to form one crown shape data 50. Surface data was created by calculating control points during that time. As a method of generating a curved surface by using the margin line 36 and the maximum protruding portion 38 as boundary curves and using control points between them as a boundary curve, there are methods using a Bezier curve, a spline curve, and the like. The surface data was calculated. The rib shape data 51 for gripping the workpiece during grinding is replaced with the crown shape data 5.
0. It is shown in FIGS.

Based on the crown shape data 50, a porcelain prism block was ground with a diamond bar tool in the same manner as in Example 1 to produce a crown for a dental prosthesis. Conventionally, the matching of the margin lines and the inner surface that required advanced technology were successfully performed. Further, even if the wax model is made rougher than before, it is a method not related to the accuracy of the dental prosthesis.

In this embodiment, a wax model was prepared from an abutment gypsum model. However, if you have an abutment model,
One piece of crown shape data may be used based on model data created in the patient's mouth or existing occlusal surface data that is transformed or transformed. A boundary line such as a margin line or a maximum protruding portion can also be extracted by measuring a contour of a maximum area on an XY plane in advance, comparing the contour with data obtained by shape measurement, and deleting an overhang portion. . Although the crown of a dental prosthesis has been illustrated, a connecting crown can be made in a similar manner. For bridges, prepare pontic (dummy) data,
It can be dealt with by performing transformation or conversion. Further, the material of the abutment tooth model, the workpiece and the workpiece, the three-dimensional shape measuring method, the processing method, the offset method and amount of data, and the overhang direction are not limited to the examples.

[0026]

Example 4 Using the apparatus of Example 1, a coping (frame) was prepared from an abutment tooth plaster model. Impressions were taken from the oral cavity of the patient, and a cast tooth plaster model was raised. FIG.
An abutment plaster model 34 was prepared by trimming 35 the gingival part below the margin line 36 as shown in FIG. The shape of the gypsum abutment model was measured in the same manner as in Example 3 (FIG. 1).
2). After that, delete the overhang data,
Abutment tooth shape data 44 was used. Further, similarly, the data below the boundary line, that is, the line 46 having a height of 1.0 mm from the margin line 36 is deleted, and the data is reduced by 50 in the normal direction.
Data 45 μm offset and data 45 covering the margin line 36 were prepared. The offset surface tension data 45 was subjected to male / female and mirror conversion to obtain coping inner surface shape data 52. Coping outer shape data 53
Is data obtained by deleting data below the line at a height of 0.6 mm from the margin line 36 of the abutment tooth shape data 44, offsetting it by 0.5 mm in the normal direction, and covering the margin line 36. It is. Fig. 18
Shown in In FIG. 19, the coping inner shape data 52 and the outer surface shape data 53 are synthesized into one coping shape data 54 and processing rib data 55 is added. On the basis of this data, ordinary titanium cutting was performed by the apparatus of Example 1. A portion of the rib was cut from the completed titanium coping 56. A porcelain material 57 was baked on this titanium coping 56 to complete the process. As shown in FIG.

The frame of the connecting crown or bridge, as well as the denture base, can be produced in a similar manner. The material of the abutment tooth model and the workpiece, the three-dimensional shape measurement method, the processing method, the data offset method and amount, and the overhang direction are not limited to the examples.

[0028]

According to the present invention, when machining to a certain desired shape, it is possible to shorten the machining time, extend the life of the machining tool, and reduce the number of man-hours. In addition, it has become possible to easily perform the fitting of the inner surface of the dental prosthesis and the matching of the margin line, which require precision in the dental field. This has led to a significant promotion of the spread of mechanization, especially in the field of dentistry. As a result, the skill of the dental technician is not required, and the man-hour and labor required for the production of the dental prosthesis can be reduced, thereby leading to the supply of a high-quality dental prosthesis.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of the apparatus of the present invention.

FIG. 2 is a diagram of an XY plane roughing (crown model)

FIG. 3 is a side view of the contour machining of FIG. 2;

FIG. 4 is a diagram of a rough XZ plane (crown model)

FIG. 5 is a diagram of rough removal of an abutment tooth surface (inner surface).

FIG. 6 is a diagram of an XY plane roughing (inlay model).

FIG. 7 is a side view of the contour machining of FIG. 6;

FIG. 8A is a view of an XZ plane rough removal (inlay model), and FIG. 8B is a view in which FIG.

FIG. 9 shows a trimmed abutment tooth plaster model.

FIG. 10 is a view obtained by waxing up in FIG.

FIG. 11 is a diagram showing a three-dimensional shape measurement on the occlusal surface side after waxing up;

FIG. 12 is a diagram showing a three-dimensional shape measurement of a trimmed abutment tooth plaster model.

FIG. 13 is a diagram in which the data below the margin line of the data obtained by measuring the three-dimensional shape in FIG. 12 are deleted.

FIG. 14 is a diagram in which the data of FIG. 13 is subjected to offset and male / female conversion to obtain internal machining data.

FIG. 15 is a view of the data obtained by measuring the three-dimensional shape of FIG.

FIG. 16 is a surface view from the margin line to the maximum ridge line.

FIG. 17 is a diagram in which processing rib data is combined with crown shape data.

FIG. 18 is a diagram in which coping inner / outer surface shape data is created.

FIG. 19 is a diagram in which processing rib data is combined with coping shape data.

FIG. 20: Baking porcelain on titanium coping

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 CRT of a general-purpose personal computer 2 General-purpose personal computer main body 3 Processing machine tool main body 4 3D shape measurement area 5 3D processing area 6 3D shape measurement probe 7 Spindle motor 8 Contact element 9 Jig (rotatable) 10) Jig for gripping the object to be measured (rotatable) 11 Crown model of dental prosthesis 12 Measurement rib with positioning stopper 13 Cable for sending 3D shape measurement data to general-purpose personal computer 14 Data for controlling NC machine tool 15 Porcelain prism block 16 Rib to be gripped by a processing machine tool 17 Crown model projected on XY plane of 15 18 Crown model Locus of grinding tool in contour processing on XY plane 19 Grinding tool 20 Crown Porcelain prism block after model contour machining 21 Abutment tooth Contour lines on the side (inner surface) 22 Porcelain prism block side profiled on XZ plane 23 Crown model projected on XZ plane of 20 24 Trajectory of grinding tool in contour processing on XZ plane 25 Porcelain prism block 26 25 Inlay model projected on XY plane 27 Inlay model Trajectory of grinding tool in contour processing on XY plane 28 Porcelain prism block after inlay model contour processing 29 Inlay model projected on XZ plane of 28 30 XZ Trajectory of the grinding tool in contour processing on a plane 31 Grinding tool (for both roughing and finishing) 32 Nozzle for water injection 33 Stopper for rib positioning 34 Abutment tooth plaster model trimming the gingival part below the margin line 35 Over Hanging trimmed part 36 Abutment tooth plaster model Margin line 37 Wax model 38 Maximum prosperity (line) of wax model 39 Data measured on wax model surface 40 Fixed adapter 41 Fixed adapter rib 42 Data measured on abutment gypsum model surface 43 Lower limit line in Z-axis direction of contact element 44 Abutment tooth shape data 45 Data obtained by offsetting the abutment tooth shape data 46 A line with a certain height from the margin line 47 Occlusal surface shape data 48 Data covering the margin line to the maximum bulge 49 Internal surface shape data (support 50 Crown shape data 51 Rib shape data 52 Coping inner surface shape data 53 Coping outer surface shape data 54 Coping shape data 55 Machining rib data 56 Titanium coping 57 Ceramic material 58 Overha Unnecessary three-dimensional shape data grayed

 ──────────────────────────────────────────────────の Continued on the front page (72) Inventor Tadashi Hamaya 1-10-33-205 Saginumadai, Narashino-shi, Chiba

Claims (6)

[Claims] 1. A processing method for forming a contour to a target shape or an approximate shape thereof by contouring a workpiece using a side portion of a processing tool. 2. The processing method according to claim 1, wherein a surface obtained by rotating or moving a workpiece or a processing tool is contour-processed. 3. A method for performing measurement or machining by coaxially placing an object to be measured and an object to be processed, or performing measurement or processing by rotating or moving the object to be measured and an object to be coaxially provided, and That device. 4. The three-dimensional shape data is created by deleting overhanging data from the measured data obtained by measuring the three-dimensional shape and complementing the deleted data based on the required three-dimensional shape data. how to. 5. A method for creating three-dimensional shape data from one or a plurality of data based on the data obtained in claim 4. 6. The method for creating three-dimensional shape data according to claim 5, wherein a deformation, conversion, surface covering or offset process is performed.