JPH10192305A - Production of artificial adaptation material and its device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To embody a machine tool capable of working an artificial tooth as the ultimate approximate shape working member. SOLUTION: The purpose of this method is to make the artificial tooth of a basic and ideal form adaptable to the inlay, crown, etc., intrinsic to a patient by correcting the artificial material adaptable thereto. The artificial material having the extremely high adaptability is produced in an extremely short working time by selecting the existing artificial material and correcting and working the material according to part to be adapted. Namely, the adaptation section is measured and the correction part of the preset artificial material is selected in accordance with the measurement. The mainly the correction part of the selected artificial material is then worked.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to the manufacture of dental materials or members.

[0002]

2. Description of the Related Art Dental materials are mainly manufactured by hand, and a great deal of labor is required because many metals and ceramics are required for processing. Also, the processing accuracy varies from person to person, and includes many craftsman elements. In recent years, mechanization has been considered, and as one of the methods, there is a method of processing dental materials using an NC machine tool. However, at present, the material and color tone of the workpiece and the processing method thereof have not been established yet.

[0003]

When machining dental materials with an NC machine tool, it has been the current practice to start cutting from a block of hard resin block, ceramics or metal. In this case, the cutting process is performed from the block corresponding to the size of the dental material in the final form, but there is a problem that the cutting process still takes time. In addition, when fabricating inlays, crowns, and other items that require aesthetics, it is necessary to cut hard resin or ceramic blocks with an NC machine tool, and then apply color and apply a transparent layer on the surface to adjust the color tone. is there. From the above,
Even if dental work is performed using NC machine tools, labor saving is still far from being achieved. Not only dental materials but also artificial joints such as artificial hip joints, artificial limbs and artificial limbs which have a joint with a living body, and artificial materials which require joining with an indefinite part cannot avoid the same problem. Met.

[0004]

The artificial teeth used for dentures and the like have good esthetics, all kinds of teeth are prepared, and there are many kinds. However, when using this artificial tooth as, for example, an inlay or a crown, it is necessary to consider the shape specific to the patient, and the artificial tooth cannot be used as it is. Therefore, the present invention has realized a machining machine tool capable of machining an artificial tooth as an ultimate approximate shape machining member. In other words, the purpose is to modify and apply a basic and ideal form of artificial tooth to the inlay and crown etc. unique to the patient, select an existing artificial material and modify it according to the application site By processing,
This realizes the production of an artificial material having a short processing time and a very high applicability.

[0005]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention proposes a method of measuring a portion to be applied, selecting a preset correction portion of an artificial material based on the measurement, and processing a correction portion mainly of the selected artificial material. However, the application site is a deficient part of a living tissue, a deficient part of a structure, a part unique and irregular to a tissue or the like, a tooth deficient part, or a pendant, medal, or ring mainly composed of a sculpture. It shows the surface shape and the like of an object for creating accessories such as accessories, ornaments, imitations and the like. Based on the measurement, and, data indicating the shape of the application site obtained by the measurement, a model, a mold and the like, in an indirect formation such as those obtained by being molded from the application site,
The surface shape of this indirect formation is brought into contact with the probe,
The surface shape is measured indirectly using laser, ultrasonic wave, stereo photography, etc. on the object obtained by converting the amount of mechanical displacement into an electric signal such as numerical data or this indirectly formed object, and numerical information is obtained. Etc. are shown. It should be noted that the indirectly formed product may not be created as described above, but may be a measurement of the directly applied portion. In addition, the preset artificial material has a general-purpose shape which is statistically, empirically, or has been created in a commercially effective manner in consideration of fashion and the like in advance. A database is created in such a manner that data in which the shape, color, pattern, and other characteristics of each artificial material are numerical values, codes, and other information are uniquely associated. Determining the correction part for the artificial material is based on the premise that if there are a plurality of artificial materials described above, one of them is selected. Does not show only the case where there is an artificial material, but as a result of the above-described prediction, a case where the number of corrected portions is small as a whole, and in other cases, one artificial material is also included. Specifically, this selection means that the measured data and the artificial material data are compared numerically, chromatically, two-dimensionally, or three-dimensionally. By selecting according to the palatability, or from the indirect formation obtained from the shape of the application site, create a selection formation obtained by molding mainly the selected site, etc. Matching or nearly matching or directly selecting an existing artificial material that seems appropriate, such as by directly applying an artificial material, but indicating the same or similar shape derived based on at least the shape of the application site, or The present invention is not limited to the above, and selects a shape that seems appropriate. The comparison is
In addition to performing both shapes at the same magnification, either one or both may be performed in a reduced or enlarged state, especially if you want to precisely compare the main parts of the comparison, expand that part and compare it, etc. By reducing and doing a simple comparison,
Higher precision and faster production is possible. Furthermore, the correction part is mainly processed for the selected artificial material.
The correction portion indicates a portion that is determined to be necessary in comparison with the data, or a portion that is empirically and statistically deemed to need to be constantly corrected. After the correction section is performed, correction processing is performed based on the measurement data. This processing is mainly performed by a processing machine tool. Machining machine tools are NC machine tools, CAD / CA
An apparatus using M, an apparatus that performs machining such as cutting, drilling, and assembling based on data such as numerical values and codes, a robot, and the like are shown. In addition, when setting a correction portion for an artificial material, in addition to simply determining a correction portion, a case in which a difference in shape between measurement data and accumulated data of an existing artificial material is corrected in terms of data, In some cases, the data is corrected based on the correction data according to the preference or the like.

In the present invention, it is suitably used for preparing an artificial tooth to be applied to a tooth defect part as an application site. As a means for correcting the artificial tooth to a patient-specific shape, a cutting tool, a grinding tool, a polishing tool, a laser, or the like is used. The above-mentioned artificial tooth refers to an artificially manufactured tooth that is used for the purpose of restoring function and esthetics in place of a missing tooth. The material is porcelain, resin or a mixture of these and metal. The modification of the artificial tooth is basically processing a part of the artificial tooth having the shape of a tooth. For example, the modification of the occlusal surface of the artificial tooth to the occlusal surface specific to the patient, and support for dental treatment. This shows modifying an artificial tooth to a trapezoidal or cavity-formed shape, and the like. The above examples are not limited to this.

[0007]

[Function] When an artificial tooth used for dentures or the like is used as a crown, for example, it is possible to measure the abutment part of the patient and use the measured abutment part of the artificial tooth only by cutting. I can do it. When an artificial tooth is used as a dental restoration other than dentures, it can be applied only by modifying the shape to be suitable for the patient, so that the production time can be greatly reduced. Also, artificial teeth are said to be aesthetically better than porcelain baked and cast crowns that are usually produced by dental technicians.
The use of the artificial tooth as a crown, for example, means that a crown with the best esthetics can be obtained in the current state of dental technics. As described above, the operation and the like when an artificial tooth is created by using the present invention have been described, but similarly for other artificial materials, the processing time is shortened, the aesthetics are improved, the burden on the manufacturer is reduced,
It is possible to measure the downsizing of the apparatus due to the decrease in the data processing amount.

[0008]

Embodiment 1 An embodiment of the present invention will be described with reference to FIG. In FIG. 1, reference numeral 111 denotes a measuring unit which measures an application site such as a tooth missing portion, a shape of an artificial tooth attachment portion, and a shape of a person's face. The physical displacement of the probe caused by the unevenness of the probe is measured, and the shape data is calculated from the displacement. In addition, a non-contact shape measuring device using a laser, an ultrasonic wave, or a stereo photograph method may be used. The measuring unit 111 mainly measures the entire application site,
Depending on the type of application site, only a part of the application site may be measured. In this case, since the measurement time can be reduced, the molding of the application unit is omitted and the shape of the application unit is directly measured. Therefore, the measurement can be performed in a short time so as not to burden the patient even in a state where the mouth is opened, such as a tooth missing portion. Reference numeral 112 denotes a data storage unit that stores shape data and surface color data of a plurality of artificial tooth models created in advance as samples. The shape data is preferably formed of numerical values, signs, and the like that can be compared or calculated with the data obtained by the measuring unit 111. The data storage means is a hard disk, CD-RO
A personal computer or the like provided with a storage unit such as an M or a modem or the like for obtaining the data using a communication line is suitably used. The data storage means 112 is not necessarily required to be made into an electronic database according to the amount of the model and the like, and is a catalog in which the features of each model are arranged to the extent that they can be viewed or a catalog in which the features are projected. Is also good. Reference numeral 113 denotes selection means, which includes visual selection, compares measured data obtained by the measurement means 111 with various data called out from the data storage means 112, compares the main parts or the entire shape, and performs approximation. Alternatively, the same degree is obtained by, for example, converting to a difference amount, and a model of the artificial tooth which is considered to be optimal is selected. or,
The selection means 113 further molds the model obtained by molding from the application section to create a mold, directly applies an existing artificial tooth to the mold, and selects an artificial tooth that roughly matches. You may. Reference numeral 114 denotes a correction unit setting unit that sets a portion requiring correction in advance or sets a portion determined based on the difference between the shape of the selected artificial tooth model and the shape obtained from the measurement data. . still,
If the correction unit is set in advance, it may not be necessary. Reference numeral 115 denotes a processing unit, which uses, for example, the above-described apparatus, and is a cutting apparatus or the like according to input numerical data. This is for performing a cutting process based on data obtained by the measuring unit 111 or based on comparison data between the measuring unit 111 and the data storage unit 112.

The operation will be described below. From the tooth missing part,
After forming a molded model such as an abutment tooth, the surface shape of the model is measured by the measuring unit 111. Measuring means 1
The data measured at 11 is transmitted to the selection means 113 as binary or text data indicating the shape. The selection unit 113 sequentially calls the existing artificial tooth data from the data storage unit 112 with respect to the input shape data, and compares or compares the main parts or all of them in a template-like manner to determine a match / mismatch and a match probability within an allowable range. Calculate and select an artificial tooth model having the optimal shape. At that time, in order to reduce the amount of comparison operation processing,
Alternatively, a portion where the shape of the data input from the device changes rapidly may be extracted as a feature point, and only the portion corresponding to this feature point may be compared with the artificial tooth model data obtained from the data storage unit 112. . In the artificial tooth model selected by the selection unit 113, detailed measurement or detection of a portion having a remarkable difference is performed, and only data of a part that requires processing is set in the data obtained by the measurement unit 111. Is output to the processing means 115 in an appropriate form. Processing means 115
Is for cutting the selected artificial tooth model based on the measurement data set by the correction unit setting means 114. The data storage unit 112, the selection unit 113, and the correction unit setting unit 114 can be replaced with software such as a personal computer as described above. However, when the correction unit is set in advance, the existing model can be easily replaced. In the case where the means can be selected, the means may not be executed by the microcomputer but may be manually operated by the user.

Embodiment 2 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. 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.
The miniaturization and the cutting accuracy have also been improved. The cutting machine tool 3 in FIG. 2 three-dimensionally corrects and cuts an artificial tooth in three axes of X, Y, and Z axes. The configuration of each axis is such that an X-axis table 4 is mounted on a Y-axis table 5, an artificial tooth is mounted thereon, and a spindle motor 8 and a cutting drill 9 are mounted on a Z-axis table 6. That is, the artificial tooth moves two-dimensionally (in a plane), and the height is supplemented by a cutting drill. An AC servomotor 7 is used for the power of each axis, and feedback control is performed by an encoder. Also, a spindle motor 8 is used as power for the cutting drill.
It was used. Each operation was controlled by the personal computer 2 by connecting the cutting machine tool 3 to the personal computer 2.
Further, a rotating jig 116 for fixing the artificial tooth or the measured object was attached, and the artificial tooth or the measured object was fixed. The portion to be corrected and cut is only the margin line including the occlusal surface and the abutment tooth surface, and the other portion is used as a patient-specific crown using the shape of the artificial tooth.

A procedure for modifying and cutting an artificial tooth into a crown will be exemplified below. The dentist forms the abutment,
A quick-to-polymerize resin to be used for dental treatment is put on the place in an appropriate tooth form. Thereafter, the patient performs the occlusion as it is, and removes the immobilized instantly polymerized resin mass. A margin line of the taken-out lump is formed and used as a three-dimensional measurement model. Before attaching the three-dimensional measurement model 11 to the cutting device 3 of the present invention, a rib (handle) 28 for attaching to the cutting device is attached. At this time, a dedicated rib mounting jig shown in FIG. 7 is used. The structure of the rib mounting jig is the slider type fixed device 21
It is fixed in the XY directions by a and b and the screw-shaped pin type fixing devices 25a and b. The slider-type fixing devices 21a and 21b are the same as the principle of positioning the paper centered by a facsimile or a printer. When one slider fixing device is moved, the other slider fixing device moves by the same amount in the opposite direction. Further, the three-dimensional measurement model 11 is fixed using the screw-shaped Z-axis pin type fixing device 24.
An aluminum rib 28 was attached to the fixed three-dimensional measurement model 11 with an adhesive using a dedicated rib attachment jig. The occlusal surface of the three-dimensional measurement model 11 prepared as described above was measured by a three-dimensional shape measuring instrument installed in the cutting device of the present invention. Further, the measurement model 11 was inverted by 180 ° by the rotating jig 116, and the portion of the abutment tooth surface was measured in the same manner, and this was used as the three-dimensional shape data of the measurement model.
The three-dimensional measurement data was processed by the personal computer 2 on the cutting data of the cutting device of the present invention. The artificial tooth is subjected to a correction cutting process to be used for a dental prosthesis other than dentures, and it is necessary to correct the artificial tooth part 29 of the occlusal surface shown in FIG. With the margin line portion 30 alone, the side surface 31 can be basically used without performing a modified cutting process. That is, since the part for measuring and cutting the three-dimensional shape is limited, the time for measuring and cutting the three-dimensional shape can be reduced.

Artificial teeth 16 for use in modified cutting
Select a color tone, shape and size from among commercially available products.
As a means of selecting, the point cloud data is created by measuring the shape (including the size) of the artificial tooth in advance by each manufacturer in three-dimensional shape, and the guidelines for the color tone used in dentistry according to the point cloud data Is performed using a database prepared in advance. FIG. 12 shows a procedure for selecting an artificial tooth to be subjected to correction cutting using the database. First, the mesio-distal and bucco-lingual lengths of the margin line of the measurement data of the abutment tooth surface including the margin line of the three-dimensional measurement model are calculated. Search the database for slightly larger artificial teeth based on the calculated results. Further, the occlusal surface measurement data of the three-dimensional measurement model is similarly searched from the database.
Regarding the color tone, the dentist visually checks the neighboring teeth of the patient,
Judge with the shade guide and search on the database. From the above three types of search results, the optimal artificial tooth for performing the corrective cutting is selected. Selected artificial tooth 1
6 is set on a dedicated rib mounting device in a state where ribs are attached to the three-dimensional measurement model, and the size is confirmed. A rib attaching operation is performed by using a dedicated rib attaching device that uses the selected artificial tooth 16 at the time of the measurement model. At this time, the positions of the slider-type fixing devices 21a and 21b and the screw-type pin type fixing devices 25a and 25b for fixing in the XY directions and the position of the screw-type Z-axis pin type fixing device 24 were determined by attaching ribs to the measurement model. Use location.
However, the position in the XY directions is finely adjusted to the center. The screw-shaped Z-axis pin type fixing device 24 is fixed in accordance with the screw-shaped Z-axis pin type fixing device 24 at the lowest position. The artificial tooth 16 fixed as described above is attached to the aluminum rib 2
8 was attached with an adhesive. The artificial tooth 16 with ribs was set in the cutting device 3, the occlusal surface was subjected to a modified cutting process, which was inverted by 180 °, and the abutment tooth surface was subjected to a modified cutting process.
Thereafter, the rib 28 attached to the artificial tooth is removed, and the modified cutting artificial tooth is used as a dental prosthesis (crown) for the patient. FIG. 11 shows a flowchart of the above operation. What was done by the above-mentioned method is a dental CAD /
The measurement time was shorter than when a dental prosthesis was manufactured from blocks simply by measuring with a CAM device, and the aesthetics were also good. The present invention is not limited to the case where a dental prosthesis other than dentures can be manufactured using a computer using artificial teeth. In addition, since the slider-type fixed device described above holds a part of the shape of the three-dimensional measurement model, it is possible to determine the coincidence or non-coincidence by placing an existing artificial tooth in the retained shape. It can be

Example 3 Unlike Example 2, only the abutment tooth surface and the margin line portion of the artificial tooth were modified and cut by the cutting machine tool 3, and the artificial tooth was used as a crown. Examples are shown below.

[0014] First create a model, modify cutting the abutment teeth surfaces and the margin line portion, and several prepared in accordance with the size and site of the shell crown 32 of the artificial tooth having the same shape to be used. From these several types, the shell crown 32 used for the three-dimensional shape measurement model was selected in light of the abutment tooth, the adjacent tooth, and the like.
The shell crown 32 is a resin crown in which the inside is hollow as shown in FIG. The hollow portion of the shell crown 32 was immediately filled with a polymerized resin 33 and attached to the formed abutment teeth 34. Thereafter, the teeth were engaged with each other with an opposing tooth, and the curing of the polymerized resin 33 was immediately confirmed. As shown in FIG. 14, the immediate polymerization resin 36ab overflowing with the removed shape 35 was cut off with a knife to obtain a three-dimensional shape measurement model.

Measurement, Selection and Correction of Model The measurement model shown in FIG. 15 and the three-dimensional shape measurement model prepared as described above are immediately poured into a polymerization resin 38 into a jig 39 for attaching an artificial tooth to the cutting machine tool 3. 35 was pressed in, and the resin 38 was immediately cured.
Thereafter, the jig 39 was attached to the cutting machine 3 with the three-dimensional shape measurement model 35 attached. The stylus 37 mounted on the contact type three-dimensional measuring device 10 of the cutting machine tool 3 was used for contact measurement of the abutment tooth surface and the margin line (range 41a to 41b) of the three-dimensional shape measurement model 35. . The measured data was converted to corrected cutting data by CAD / CAM software to prepare for corrected cutting.

FIG. 16 shows a state where the jig 39 with the three-dimensional shape measurement model 35 is removed from the cutting machine tool 3 after the completion of the processing measurement, and the three-dimensional shape measurement model 35 is further removed from the jig 39. The jig 39 in this state can also be a selecting means similarly to the above embodiment. An existing artificial tooth 42 having the same occlusal surface shape was attached to the jig 39 with an adhesive. In the state shown in FIG. 17, the jig 39 with the artificial tooth 42 is attached to the cutting machine tool 3 via the attachment rib 40,
Correction cutting was performed on the artificial tooth 42 based on the correction cutting data. Fixing artificial tooth 42 to jig 39
And used as a crown. Compared with Example 2, the time could be reduced to about half since there was no step of measuring and cutting the three-dimensional shape of the occlusal surface. The present invention is not limited to the case where a dental prosthesis other than dentures can be manufactured using a computer using artificial teeth.

[0017]

By using the processing apparatus of the present invention to modify an artificial tooth used for dentures or the like to a dental prosthesis other than dentures, the time required for producing a dental prosthesis other than dentures is greatly reduced. I can do it. In addition, a dental prosthesis other than dentures having good esthetics can be obtained.

[Brief description of the drawings]

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

FIG. 2 is an external view of a modified cutting machine tool according to the embodiment of the present invention.

FIG. 3 is a diagram illustrating that a three-dimensional measurement model is created from formed abutment teeth.

FIG. 4 shows an artificial tooth before modified cutting.

FIG. 5 is an artificial tooth after a modified cutting process.

FIG. 6 is a view in which artificial teeth after modified cutting are mounted on the formed abutment teeth.

FIG. 7 is an external view of a rib mounting jig.

FIG. 8 is a view for explaining rib attachment to a three-dimensional measurement model by a rib attachment jig.

FIG. 9 is a view for explaining rib attachment to an artificial tooth using a rib attachment jig.

FIG. 10 is a view for explaining a portion of a modified cutting process of an artificial tooth.

FIG. 11 is a flowchart of a procedure of an artificial tooth correcting process.

FIG. 12 is a search flowchart for selecting an artificial tooth in a database.

FIG. 13 is a view for explaining the measurement model production using a shell crown and an instant polymerization resin.

FIG. 14 is a view showing a measurement model removed from an abutment tooth.

FIG. 15 is a diagram in which a measurement model is attached to a dedicated jig.

FIG. 16 is a diagram in which a measurement model is removed after measurement.

FIG. 17 is a view in which an artificial tooth to be modified is attached to the jig of FIG. 15;

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 PC CRT 2 Personal computer main body 3 Correction cutting machine body 4 X-axis table 5 Y-axis table 6 Z-axis table 7 Servo motor attached to encoder 8 Spindle motor 9 Cutting drill 10 Contact type 3D measuring device 11 3D measurement Model 12 Cable for exchanging data between general-purpose personal computer and modified cutting machine tool 13 Cross-section of patient's abutment tooth formed 14 Natural root of patient 15 Gingival cross-section 16 Cross-section of artificial tooth before modified cutting 17 Modified cutting The occlusal surface of the processed artificial tooth 18 The margin line of the artificial tooth that has been subjected to the modified cutting 19 The abutment tooth surface of the artificial tooth that has been subjected to the modified cutting 20 Attaching a rib (handle) to the three-dimensional measurement model and the artificial tooth Grooves 21a, b Slider-type fixed device 22a, b Gears for synchronizing slider-type fixed device 23 A gear for synchronizing a slider-type fixed device 24 A Z-axis pin-type fixed device 25a, b A pin-type fixed device 26 A plate 27 for fixing a rib attaching jig to a table 27 Moves and fixes a plate of 26 Rib (handle) for attaching 3D measurement model and artificial teeth to cutting machine tool 29 Range of occlusal surface side for modifying and cutting artificial teeth 30 Abutment tooth surface for modifying and cutting artificial teeth Side range 31 The side part where the artificial tooth is not modified and cut 32 Shell crown (the occlusal surface has the same shape as the artificial tooth) 33 Immediately polymerized resin filling part 34 Abutment tooth 35 Three-dimensional shape measurement model 36a, b 37 stylus to be attached to the contact type three-dimensional measuring device 10 38 three-dimensional shape measurement model and immediate polymerization resin for fixing artificial teeth 39 measurement model and artificial The cutting machine 3 handle 41a for attaching the jig to the jig 40 cutting machine 3 for mounting the artificial tooth to the range 42 fixes the cutting of the margin line and abutment surfaces to b measured

Claims (5)

[Claims] 1. A method for manufacturing an artificially applied material, comprising: measuring an application site; selecting a preset artificial material based on the measurement; and mainly processing a correction portion of the selected artificial material. Method. 2. A measuring means for measuring a portion to be applied, an existing artificial material prepared in advance so as to be applicable to the applied portion and a storing means for storing the information, a measurement data obtained by the measuring means, An artificially applied material manufacturing apparatus comprising: a selection unit that compares accumulated information to select an appropriate artificial material; and a processing unit that mainly processes a correction unit for the artificial material selected by the selection unit. 3. The method and apparatus for producing an artificial application material according to claim 1, wherein the artificial application material is a living tissue prosthesis, a dental prosthesis, a dental filler, or an artificial tooth. 4. A method and apparatus for producing a dental material other than dentures using artificial teeth, wherein the artificial teeth used for dentures and the like are modified into a suitable shape when used as dental materials other than dentures. 5. An artificial tooth used for dentures or the like, wherein a member obtained by enlarging or reducing an artificial tooth, a mass of artificial teeth made of a material with little modification is used, and used as a dental material other than dentures. 4. A method and an apparatus for producing a dental material according to 4.