JP2012217622A - Method of manufacturing dental occlusion face part for replacement of artificial posterior tooth - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for obtaining a dental occlusion face part having a dental occlusion face side shape with the use of an artificial posterior tooth where the dental occlusion face part and a bottom part are temporarily joined by a joint part in order to obtain functional dental occlusion, and then, rapidly manufacturing, based on the obtained dental occlusion face part, the dental occlusion face part for replacement, which is different from the dental occlusion face part and is constituted of a replacement material with excellent wear resistance, by highly accurately following a difference in the dental occlusion face side shape of the dental occlusion face part with the functional dental occlusion attained therein.SOLUTION: The method is for manufacturing the dental occlusion face part for replacement for the dental occlusion face part with the functional dental occlusion attained therein with the use of a CAD/CAM system. The CAD system includes a process to acquire design data corresponding to the replacement material of the dental occlusion face part for replacement, based on three-dimensional shape data of the dental occlusion face part. The CAM system includes a process to acquire CAM data of the dental occlusion face part for replacement corresponding to a dental occlusion face part for replacement manufacturing means, based on the design data. The dental occlusion face part for replacement manufacturing means includes a process to manufacture the dental occlusion face part for replacement under control according to the CAM data.

Description

  The present invention relates to a method for producing an occlusal surface part for replacement of an artificial molar. More specifically, the present invention relates to a replacement occlusal surface portion made of a replacement material excellent in wear resistance different from the occlusal surface portion of an artificial molar tooth having a double structure of an occlusal surface portion and a bottom portion where functional occlusion is obtained. The present invention relates to a method of manufacturing by a CAM system.

  An occlusal surface portion made of either a synthetic resin or a composite material of a synthetic resin and a ceramic, which is removed after a functional occlusion mark is obtained and replaced with a material selected from metal, ceramic, composite resin, etc. For example, an artificial tooth shown in FIG. 13 has been developed which has a double structure with a bottom portion which is a synthetic resin, ceramic, or a composite material of synthetic resin and ceramic (Patent Document 1).

FIG. 13 shows an artificial molar 54 for the first molar of the lower jaw in which an occlusal surface 51 and a bottom 52 for obtaining a functional occlusion are temporarily joined by a joint 53. The occlusal surface 51 is provided with a maintenance projection 55 on the back side. The outer shape of the occlusal surface 51 has an occlusal surface side shape for obtaining a functional occlusion and a mating surface side shape of the bottom 52. The occlusal surface part 51 and the bottom part 52 are temporarily joined at the joint part 53 in a state where the separation film 56 is interposed between the occlusal part 51 and the bottom part 52 and the maintenance projection 55 is fitted in the concave part 57 of the bottom part 52. ing. The joint portions 53 are provided on the cheek and lingual sides of the artificial molars 54, respectively. Instead of the separation film 56, a separation release agent may be provided on the bottom 52.
The artificial molars in which the occlusal surface part 51 and the bottom part 52 for obtaining the functional occlusion are temporarily joined at the joint part 53 are manufactured on the manufacturer side by combining various shapes, sizes, colors, etc. for each molar tooth. It is provided to dental clinics, dental laboratories, etc., and is appropriately selected and used according to the patient.

  FIG. 14 shows a denture 60 in which the base surface of the artificial molar 54 for the first molar of the lower jaw is embedded in the denture base 59, and the patient can naturally chew it through food in normal life (normal chewing). 1 week to 1 month, the occlusal side wears and it is determined that the optimal functional occlusion mark is obtained for the patient. The temporarily bonded buccal and lingual joint 53 is a resin point for polishing. And the occlusal surface 51 is removed from the bottom 52 of the artificial molar 54. Then, the separation film 56 is removed. In the case of a release agent for separation, it is removed by peeling with an appropriate tool. Next, the removed occlusal surface 51 is replaced with a replacement occlusal surface made of a replacement material such as metal. For example, when the replacement material is a metal or a castable ceramic, a sprue is applied to the occlusal surface portion 51 and buried in a fire-resistant mold according to a common method, and the replacement occlusal surface portion of the metal or castable ceramic is cast. The cast occlusal surface for replacement is subjected to sand blasting and final polishing according to a conventional method. The obtained replacement occlusal surface is bonded to the bottom 52 of the artificial molar 54 of the denture 60 using a dental adhesive. When the replacement material is a composite resin or the like, a precise negative mold of the occlusal surface portion 51 is made of gypsum or an impression material, and the composite resin or the like is cured according to a common method to obtain a replacement occlusal surface portion. The obtained replacement occlusal surface is bonded to the bottom 52 of the artificial molar 54 of the denture 60 using a dental adhesive. The artificial tooth having a replacement occlusal surface portion made of a functional occlusion metal, castable ceramic, composite resin and the like thus obtained is very balanced and excellent in durability.

  However, after obtaining a functional occlusion on the occlusal surface part using an artificial molar whose occlusal surface part and bottom part for obtaining a functional occlusion were temporarily joined at the joint part, the wear resistance is excellent based on the obtained occlusal surface part. Manufacturing a replacement occlusal surface made of a replacement material is different in the shape of the occlusal surface of the occlusal surface where a functional occlusion suitable for each patient is obtained, and as described above, in the case of metal or castable ceramic, A lot of manual work including sprue application to the surface part is required, and a composite resin or the like requires a lot of manual work including a negative production of the occlusal surface part, which takes time. In addition, these replacement occlusal surface portions require high dimensional accuracy, and thus require high skills of dental technicians. However, there are variations depending on the level of proficiency of dental technicians, so replacement is always satisfactory. The occlusal surface part is not obtained.

Japanese Patent No. 2694223

  This invention was devised as a result of diligent research in view of the above situation, and for each patient using an artificial molar in which the occlusal surface part and the bottom part for obtaining functional occlusion were temporarily joined at the joint part. After obtaining an occlusal surface portion having a different occlusal surface side shape, based on the obtained occlusal surface portion, a replacement occlusal surface portion made of a replacement material having excellent wear resistance, which is different from the occlusal surface portion, can be used by a dental technician with high skill and skill. The purpose of the present invention is to provide a method that can be manufactured quickly with high accuracy following the difference in occlusal surface side shape of the occlusal surface where different functional occlusions are obtained for each patient. .

In order to solve the above-mentioned problems, the present invention is (1) made of either a synthetic resin or a composite material of a synthetic resin and a ceramic, and has a double structure of an occlusal surface part and a bottom part from which a functional occlusion is obtained. A replacement occlusal surface portion made of a replacement material selected from a metal, a ceramic, and a composite resin for replacing the occlusal surface portion of an artificial molar whose joint portion is joined at the joint portion with a CAD / CAM system. A CAD system in which a CAD system acquires design data corresponding to a replacement material of a replacement occlusal surface based on the three-dimensional shape data of the occlusal surface, and a CAM system based on the design data The step of acquiring the CAM data of the replacement occlusal surface portion according to the replacement occlusal surface portion manufacturing means, the replacement occlusal surface portion manufacturing means being controlled based on the CAM data and for replacement Characterized in that it comprises a step of producing a slip surface.
Examples of the “metal” that is the replacement material in the present invention include titanium and cobalt chromium alloy, but are not limited thereto.
Examples of the “ceramic” as the replacement material in the present invention include zirconia and alumina, but are not limited thereto.
(2) In the above (1), the three-dimensional shape data of the occlusal surface is removed from the bottom by deleting the joint portion of the artificial molar having a double structure of the occlusal surface and the bottom where the functional occlusion was obtained. It is preferable that the entire shape including the occlusal surface side shape of the occlusal surface portion and the mating surface side shape of the bottom portion is three-dimensional shape data acquired by the CAD system based on the measurement data measured by the measuring means.
(3) In the above (1), the three-dimensional shape data of the occlusal surface portion includes the shape of the joint portion of the artificial molar having a double structure of the occlusal surface portion and the bottom portion where the functional occlusion is obtained. The occlusal surface side shape of the occlusal surface is a three-dimensional shape data based on the measurement data measured by the measuring means, and the mating surface side shape of the occlusal surface portion at the design stage before the functional occlusion is read out from the storage unit It is preferably 3D shape data acquired by a CAD system based on the corresponding 3D shape data.
(4) In the above (1), (2) or (3), the CAM system may acquire design data corresponding to the replacement material of the replacement occlusal surface portion via a communication means.
(5) In the above (1), (2), (3) or (4), the replacement occlusal surface manufacturing means may be a cutting / grinding means for a block of replacement material.
(6) In the above (1), (2), (3) or (4), the replacement occlusal surface manufacturing means may be a layered modeling means of a replacement material.
As the layered modeling means, a layered modeling means suitable for an optical modeling method, a powder method, a sheet lamination method, an ink jet method and the like can be exemplified. What is necessary is just to select an appropriate layered modeling means according to the replacement material.
(7) In the above (5) or (6), the replacement material is preferably zirconia.
(8) In the above (1), the CAD system inverts the three-dimensional shape data of the occlusal surface portion, and designs the mold according to the replacement material of the replacement occlusal surface portion based on the inverted three-dimensional shape data A step of acquiring data, a step of acquiring CAM data of a replacement occlusal surface part mold according to a manufacturing means of a replacement occlusal surface part mold based on the design data, and a replacement occlusal surface part mold manufacturing means Preferably, the method includes a step of manufacturing a replacement occlusal surface molding die controlled based on the CAM data.

Since the present invention is configured as described above, the following effects can be obtained.
In other words, using an artificial molar whose occlusal surface and bottom to obtain a functional occlusion were temporarily joined at the joint, after obtaining an occlusal surface having a different occlusal surface shape for each patient, the obtained occlusal surface Based on the occlusal surface part, the replacement occlusal surface part made of a replacement material that is durable against wear can be quickly and highly accurate regardless of the high skill and skill of the dental technician by using the CAD / CAM system. Can be manufactured.
More specific effects of the invention will be apparent from embodiments and the like described later.

It is the schematic which shows an example of the system for manufacturing the occlusal surface part for replacement used for this invention. It is a perspective view which shows the three-dimensional measuring apparatus using the laser beam as a measurement means. It is a flowchart which shows an example of the method of manufacturing the occlusal surface part for replacement by the system shown in FIG. It is a flowchart which shows the other example of the method of manufacturing the occlusal surface part for replacement by the system shown in FIG. FIG. 4 is a flowchart showing a method of manufacturing a replacement occlusal surface part by processing a semi-sintered zirconia block with an NC cutting / grinding apparatus in the flowchart of FIG. 3 using zirconia as a replacement material. 5 shows a replacement material in the flowchart of FIG. 5, where (a) is a semi-sintered zirconia block, and (b) is a perspective view of a semi-sintered replacement occlusal surface portion that has been cut and ground. In the flowchart of FIG. 3, the replacement material is zirconia, and powder zirconia is layered using a layered manufacturing apparatus to produce a replacement occlusal surface portion. It is explanatory drawing of the occlusal surface part for replacement in step S34 of the flowchart of FIG. FIG. 4 is a flowchart showing a method of manufacturing a replacement occlusal surface portion by using titanium as a replacement material and processing a titanium block by an NC cutting / grinding apparatus in the flowchart of FIG. 3. In the flowchart of FIG. 3, it is a flowchart which shows the method of processing the shaping | molding die which shape | molds a substitution material as a zirconia, and shape | molds powder zirconia by NC cutting and grinding apparatus, and manufactures the replacement occlusal surface part. In the flowchart of FIG. 10, (a) is an explanatory diagram corresponding to step S54, (b) is a step S55, and (c) is an explanatory diagram corresponding to step S56. It is the schematic which shows the other example of the system for manufacturing the occlusal surface part for replacement used for this invention. It is an example of the artificial molar which is a mandibular first molar which consists of the occlusal surface part and bottom which will be removed after the conventional functional occlusion seal is obtained, (a) is an exploded perspective view, (b) is a perspective view. (C) is explanatory drawing which shows a cheek tongue surface. It is explanatory drawing which shows the denture using the artificial molar shown in FIG.

DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments for carrying out the present invention will be shown, and the present invention will be described in more detail. Of course, the present invention is not limited to the following embodiments.
In the embodiment of the present invention, the replacement occlusal surface portion manufactured by the replacement occlusal surface portion manufacturing means includes one that can be used as the replacement occlusal surface portion by appropriate post-processing.

As shown in FIG. 1, the system for manufacturing the replacement occlusal surface portion includes a measuring means 1, a CAD system 2, a storage unit 3, a CAM system 4, and a replacement occlusal surface portion manufacturing means 5. The CAD system 2 is connected to the measuring unit 1, the storage unit 3, and the CAM system 4, and the replacement occlusal surface part manufacturing unit 5 is connected to the CAM system 4.
The system for manufacturing the replacement occlusal surface portion shown in FIG. 1 shows a configuration as a dedicated system suitable for a specific replacement material, and the replacement occlusal surface portion manufacturing means 5 is also a single type of replacement material. Explains. For example, as described later, it can be said that the replacement material is zirconia, and the semi-sintered zirconia block is cut and ground to produce a replacement occlusal surface portion.

Examples of the system for manufacturing the replacement occlusal surface portion include a measurement unit 1, a CAD system 2, a storage unit 3, a CAM system 4, and a replacement occlusal surface portion manufacturing unit 5 integrated in one place. It is not limited to.
For example, the distributed type, that is, the measurement means 1 is installed in a measurement center (dental clinic, dental laboratory, etc.), and the measurement data of the occlusal surface portion where the functional occlusion measured by the measurement means 1 is obtained is an Internet line or a dedicated line. It may be transmitted to a design / processing center provided with the CAD system 2, the storage unit 3, the CAM system 4, and the replacement occlusal surface part manufacturing unit 5 via a communication unit. In this case, the measurement data may be stored in a portable memory such as a USB memory, transported, and the measurement data may be captured at the design / processing center.
The design / processing center is distributed between the design center and the processing center, and the design data obtained by the design center is transmitted to the processing center via communication means such as the Internet line, dedicated line, Ethernet line, etc. It may be.
These design / processing centers, design centers, processing centers, etc. correspond to large-scale technical laboratories and companies.

Next, individual components of the system for manufacturing the replacement occlusal surface shown in FIG. 1 will be described.
The measurement means 1 can obtain measurement data (also referred to as “three-dimensional coordinate data”) of the occlusal surface where the functional occlusion is obtained.
What is necessary is just to measure the occlusal surface part by which the functional occlusion was obtained by the measurement means 1 in the state which took out the denture from the patient in the dental clinic, removed the junction part, and removed from the bottom part. In this case, the patient uses a temporary denture until the replacement occlusal surface is manufactured, the replacement occlusal surface is bonded to the bottom, and the obtained denture is mounted in the oral cavity. Become. Moreover, when measuring the occlusal surface side shape of the occlusal surface part including the shape of a joint part without removing the occlusal surface part from which the functional occlusion was obtained from the denture taken out from the patient in the dental clinic, it is obtained. Measurement data and three-dimensional shape data (design data) corresponding to the shape of the mating surface with the bottom acquired by the manufacturer at the design stage of the occlusal surface to obtain functional occlusion . In this case, when the measurement is completed, the denture is returned to the patient, and the patient can use the denture as it is. Thereafter, when the replacement occlusal surface portion is manufactured, the joint portion is removed, the occlusal surface portion where the functional occlusion is obtained is removed, and the replacement occlusal surface portion is bonded to the bottom. In addition, you may measure the occlusal surface side shape of the occlusal surface part including the shape of a junction part with the measurement means 1 with the dentures mounted in the oral cavity.

The measuring means 1 may be any means that can measure the three-dimensional shape of the object to be measured, and is preferably a non-contact type measuring means, but may be a contact type measuring means.
As the non-contact type measuring means, a three-dimensional measuring apparatus using laser light is preferable.

The three-dimensional measuring apparatus 10 using the laser beam shown in FIG. 2 rotates the rotating table 14 by using the rotating table 14 to rotate the measuring object 13 mounted on the measuring object mounting tool 12 installed on the mounting table 11. The measuring unit 16 rotates around the Z axis, which is the axis of the axis, moves in the X axis direction and the Y axis direction by the XY table 15, and further measures the three-dimensional coordinates of the shape of the object to be measured. While one laser sensor 17 itself is rotationally moved on the same plane including the Z axis around a desired point on the Z axis, laser light is applied to the surface of the object to be measured by one laser sensor 17 of the measuring unit 16. The laser beam reflected from the surface of the object to be measured is received, the position of the laser sensor 17 when the laser beam is received by the measuring unit 16, the light receiving angle of the laser beam, the laser beam The 3D coordinates of each point on the surface of the object to be measured are measured based on the amount of light received and the time from irradiation to light reception, and the 3D coordinate data (points of the shape of the object to be measured based on these multiple measurement points. Group data) can be obtained (see JP 2006-126033 A).
When measuring the occlusal surface part from which the functional occlusion in the state of being removed from the bottom part is obtained using the three-dimensional measuring device 10 using laser light, for example, a maintenance protrusion is provided on the measurement object wearing tool 12 as a dental utility wax. It may be temporarily fixed with, for example.

  As the measuring means, an appropriate device such as a non-contact type measuring device that obtains three-dimensional coordinate data by a computer based on an image taken of the object to be measured can be adopted.

The measuring unit 1 may include an appropriate storage unit such as a hard disk, and may store the measured measurement data.
The measured three-dimensional coordinate data may be recorded on a recording medium, and the three-dimensional coordinate data may be read when recorded on the recording medium in the CAD system.

Although not shown, the CAD system 2 usually includes an input device such as a keyboard and a mouse, and an output device such as a display and a printer.
The CAD system 2 takes in the measurement data (three-dimensional coordinate data) of the occlusal surface part where the functional occlusion measured by the measuring means 1 by CAD software is obtained, acquires the three-dimensional shape data of the occlusal surface part, and stores it from the storage unit 3. Various data such as the characteristics of the replacement material are taken in, and design data corresponding to the replacement material is acquired.
The storage unit 3 also stores three-dimensional shape data corresponding to the mating surface side shape with the bottom of the occlusal surface portion at the design stage before the functional occlusion is marked. The storage unit 3 stores, as necessary, three-dimensional data of the joint at the design stage, three-dimensional data of the occlusal surface side shape of the occlusal surface at the design stage, three-dimensional data of the entire occlusal surface at the design stage, and the like. It may be.

  The molars of the molars differ from patient to patient, and the types of molars are the first premolar, second premolar, first premolar, second premolar, third premolar, maxillary left and right, mandibular left and right Since there are 20 types in total, for example, when the molar size is 3 types of S, M, and L, the three-dimensional corresponding to the mating surface side shape with the bottom of the occlusal surface portion at the design stage before the functional occlusion is marked As the shape data, 20 × 3 = 60 types are stored in the storage unit 3. In addition, the occlusal surface may not be designed for the third molar, and in this case, 16 × 3 = 48 types are stored in the storage unit 3. If the left and right molars have a symmetrical shape, half the number may be stored in the storage unit 3. If the molar size includes not only the three types of S, M, and L, but also the classification according to gender, age, color tone, etc., it is necessary to store more types of data in the storage unit. Needless to say.

  When the measurement data is data including the occlusal surface side shape measured by the measuring means 1 and the mating surface side shape of the occlusal surface portion and the bottom portion, the entire shape of the occlusal surface portion removed from the bottom portion after the joint portion is deleted, The three-dimensional shape data of the occlusal surface is acquired by the CAD system 2 based on the measurement data. In the present invention, the “occlusal surface side shape” is not limited to the shape of only the occlusal surface, but is also used to mean the shape including the occlusal surface and the surrounding shape.

  In addition, when the measurement data is data obtained by measuring the occlusal surface side shape of the occlusal surface portion including the shape of the joint portion of the artificial molar having a double structure of the occlusal surface portion and the bottom portion where the functional occlusion was obtained, The three-dimensional shape data is the three-dimensional shape data corresponding to the mating surface side shape of the three-dimensional shape data based on the measurement data and the bottom of the occlusal surface portion at the design stage before the functional occlusion marking read from the storage unit 3 Is acquired by the CAD system based on the above.

  In addition, when the measuring means 1 is limited to what measures the whole shape of the occlusal surface part removed from the bottom part by deleting the joint part, the occlusal surface part in the design stage before the functional occlusion is recorded in the storage unit 3. It is not necessary to store the three-dimensional shape data corresponding to the mating surface side shape with the bottom.

  Further, the storage unit 3 can acquire various design characteristics of the replacement material so that the CAD system 2 can obtain design data of the replacement occlusal surface corresponding to the replacement material based on the three-dimensional shape data of the occlusal surface. Data used for the design of the replacement occlusal surface is stored.

In addition, as the memory | storage part 3, the memory | storage part in the server of the artificial tooth maker where the data of the occlusal surface part etc. in the design stage before functional occlusion marking are preserve | saved may be sufficient. In this case, data is read from the storage unit in the server via communication means such as the Internet line, dedicated line, Ethernet line or the like.
For example, as will be described later, when a replacement material is zirconia and a semi-sintered zirconia block is cut and ground to produce a replacement occlusal surface portion, the three-dimensional shape data of the occlusal surface portion and the half-fired captured from the storage unit 3 are used. Based on the shrinkage rate due to the complete sintering of the sintered zirconia, the design data of the replacement occlusal surface portion taking into account the shrinkage rate is acquired. In addition, the calculation regarding the data regarding the rest for holding | maintaining a semi-sintered zirconia block in NC cutting and grinding processing apparatus is added to the design data of the replacement occlusal surface part is made.

When the thickness of the adhesive layer needs to be adjusted when the replacement occlusal surface is bonded to the bottom with a dental adhesive, calculation is performed to obtain design data with the adhesive layer offset. .
In the design of the replacement occlusal surface portion, the occlusal surface portion or the like is usually displayed on a display in a three-dimensional graphic (for example, displayed as a solid model) so that the three-dimensional shape can be confirmed.
In addition, you may preserve | save the design data of the occlusal surface part for replacement | exchange obtained by the CAD system in a memory | storage part.

When the CAD system and the CAM system are distributed and different computers are used, the CAM system 4 usually includes an input device such as a keyboard and a mouse, and an output device such as a display and a printer. If not, it will be shared with the CAD system.
The CAM system 4 acquires design data of the replacement occlusal surface by CAM software, and acquires CAM data for controlling the replacement occlusal surface manufacturing means 5.
For example, when the replacement occlusal surface manufacturing means 5 is an NC cutting / grinding apparatus and the workpiece is a semi-sintered zirconia block, machining control data of the NC cutting / grinding apparatus is acquired as CAM data. The
Note that the CAM system may include a storage unit such as a hard disk for storing CAM data, and store the obtained CAM data of the replacement occlusal surface.

The replacement occlusal surface portion manufacturing means 5 takes in the CAM data of the replacement occlusal surface portion, and manufactures the replacement occlusal surface portion based on the CAM data.
For example, when the replacement occlusal surface manufacturing means 5 is an NC cutting / grinding device and the workpiece is a semi-sintered zirconia block, the semi-sintered zirconia block mounted on the NC cutting / grinding device is processed and controlled. Cutting and grinding are performed based on the data.

Next, a method for manufacturing the replacement occlusal surface portion using the system for manufacturing the replacement occlusal surface portion shown in FIG. 1 will be described.
In FIG. 3, the entire shape of the occlusal surface portion from which the joint portion is removed and the functional occlusion removed from the bottom portion is measured by the measuring means 1, and the replacement occlusal surface portion is manufactured using the measured measurement data. 3 is a flowchart illustrating a method.

  A denture (see Fig. 14) with an occlusal surface and bottom double-sided artificial molar embedded in the denture base is used for 1 week to 1 month, and the occlusal surface wears out, and the optimal functional occlusion is obtained for the patient. When it is determined that the joint portion has been removed, the joint portion is deleted at the resin point for polishing, and the occlusal surface portion is removed from the bottom of the artificial molar. Then, the separation film is removed. In the case of a release agent for separation, it is removed by peeling with an appropriate tool.

In the measuring means 1, the entire occlusal surface portion from which the joint portion is deleted and the functional occlusion removed from the bottom portion is measured, and the occlusal surface portion including the occlusal surface side shape and the mating surface side shape of the occlusal surface portion and the bottom portion is measured. Measurement data of the entire shape is acquired (step S1).
In the CAD system 2, the measurement data acquired in step S1 is acquired, the three-dimensional shape data of the occlusal surface portion is acquired, and the material of the replacement occlusal surface portion and the replacement occlusal surface portion manufacturing means are obtained based on the three-dimensional shape data. Design data is acquired (step S2).
In the CAM system 4, the design data acquired in step S2 is taken in, and CAM data for controlling the replacement occlusal surface manufacturing means is acquired (step S3).
The replacement occlusal surface portion manufacturing means 5 takes in the CAM data acquired in step S3, and the replacement occlusal surface portion manufacturing means is controlled based on the CAM data to manufacture the replacement occlusal surface portion (step S4).

  FIG. 4 shows that the occlusal surface side shape of the occlusal surface portion including the shape of the joint portion is measured by the measuring means 1 without removing the occlusal surface portion from which the functional occlusion is obtained from the denture, and the obtained measurement data and the functional occlusion are obtained. A method of manufacturing a replacement occlusal surface using three-dimensional shape data (design data) corresponding to the shape of the mating surface with the bottom acquired by the manufacturer at the design stage of the occlusal surface to obtain It is a flowchart.

  A denture (see Fig. 14) with an occlusal surface and bottom double-sided artificial molar embedded in the denture base is used for 1 week to 1 month, and the occlusal surface wears out, and the optimal functional occlusion is obtained for the patient. If it judges that it was done, it will measure by the measurement means 1 without removing an occlusal surface part from a bottom part, and the measurement data of the occlusal surface side shape of the occlusal surface part including the shape of a junction part will be acquired (step S11).

  In the CAD system 2, the measurement data acquired in step S <b> 11 is captured, and the processing of removing the shape of the joint portion from the occlusal surface side shape is performed by CAD software. The tertiary of the occlusal surface side shape from which the shape of the joint portion is removed. Get original shape data. For this purpose, for example, the three-dimensional data of the joint at the design stage stored in the storage unit 3 may be used. On the other hand, three-dimensional shape data corresponding to the mating surface side shape with the bottom of the occlusal surface portion at the design stage before the functional occlusion marking corresponding to the occlusal surface portion where the functional occlusion stored in the storage unit 3 is obtained is read out. Then, based on the acquired three-dimensional shape data of the occlusal surface side shape and the three-dimensional shape data corresponding to the mating surface side shape of the bottom portion read from the storage unit 3, for example, a data overlay process Thus, the three-dimensional shape data of the entire shape of the occlusal surface portion is acquired. Then, based on the acquired three-dimensional shape data of the overall shape of the occlusal surface portion, the design data corresponding to the material of the replacement occlusal surface portion and the replacement occlusal surface portion manufacturing means is acquired (step S12). Of course, the measurement data of the occlusal surface side shape of the occlusal surface portion including the shape of the joint portion obtained in step S11 and the three-dimensional data of the entire occlusal surface portion acquired by the manufacturer at the design stage stored in the storage unit 3 Needless to say, the three-dimensional data of the occlusal surface portion obtained by the functional occlusion may be acquired by performing, for example, a superimposing process on the three-dimensional data of the joint portion.

In the CAM system 4, the design data acquired in step S12 is taken in, and CAM data for controlling the replacement occlusal surface manufacturing means is acquired (step S13).
The replacement occlusal surface portion manufacturing means 5 takes in the CAM data acquired in step S13, the replacement occlusal surface portion manufacturing means is controlled based on the CAM data, and the replacement occlusal surface portion is manufactured (step S14).

This will be described more specifically.
FIG. 5 is a flowchart showing a method of manufacturing a replacement occlusal surface part by processing a semi-sintered zirconia block with an NC cutting / grinding apparatus in FIG. 3 using zirconia as a replacement material.
In the measuring means 1, the entire occlusal surface portion from which the joint portion is deleted and the functional occlusion removed from the bottom portion is measured, and the occlusal surface portion including the occlusal surface side shape and the mating surface side shape of the occlusal surface portion and the bottom portion is measured. Measurement data for the entire shape is acquired (step S21).

  In the CAD system 2, the measurement data acquired in step S21 is acquired, the three-dimensional shape data of the occlusal surface portion is acquired, and based on the three-dimensional shape data, the material of the replacement occlusal surface portion is zirconia, and the semi-sintered zirconia block is completed. The design data for NC cutting / grinding processing in consideration of the shrinkage rate in the sintering is acquired (step S22). In this case, a calculation is usually performed in which data relating to a rest for holding the semi-sintered zirconia block in the NC cutting / grinding device is added to the design data of the replacement occlusal surface portion. Calculation is performed to obtain design data with an offset corresponding to the adhesive layer as necessary.

  The CAM system 4 takes in the design data acquired in step S22, and acquires CAM data (processing control data) for controlling the NC cutting / grinding apparatus (step S23).

  In the NC cutting / grinding apparatus, the CAM data acquired in step S23 is taken in, the NC cutting / grinding apparatus is controlled based on the CAM data, and the semi-sintered zirconia block 22 with the rest 21 shown in FIG. The semi-sintered replacement occlusal surface part 23 with the rest 21 shown in FIG. 6B is manufactured by cutting and grinding (step S24). The rest 21 is removed thereafter.

The semi-sintered replacement occlusal surface portion that has been cut and ground is completely sintered according to a conventional method to obtain a replacement occlusal surface portion (step S25).
Post-processing such as shape correction and polishing of the replacement occlusal surface portion is performed according to a conventional method (step S26).
The replacement occlusal surface is bonded to the bottom using a dental adhesive (step S27).

We explained how to make semi-sintered zirconia block by NC cutting / grinding machine and manufacture replacement occlusal surface part. However, using design data of multiple replacement occlusal surface parts, semi-sintered zirconia disk has multiple replacement occlusions You may make it manufacture a surface part.
Completely sintered blocks are difficult to process and require expensive high-hardness cutting / grinding tools, ultrasonic processing tools, etc., and long-time processing is required, but semi-sintered zirconia blocks require cutting and grinding. Since grinding performance is good, cutting and grinding tools are inexpensive, and there is an advantage that high-precision machining can be performed in a short time.

FIG. 7 is a flowchart showing a method for manufacturing a replacement occlusal surface portion by making a replacement material in FIG. 3 using zirconia and powder zirconia by a layered manufacturing apparatus.
In the measuring means 1, the entire occlusal surface portion from which the joint portion is deleted and the functional occlusion removed from the bottom portion is measured, and measurement data including the occlusal surface side shape and the mating surface side shape of the occlusal surface portion and the bottom portion is obtained. Obtain (step S31).

  In the CAD system 2, the measurement data acquired in step S31 is acquired, the three-dimensional shape data of the occlusal surface portion is acquired, the material of the replacement occlusal surface portion is zirconia based on the three-dimensional shape data, and the powder zirconia is additive manufacturing. The design data of the laminated cross-section aggregate taking into account the rate of change (shrinkage rate, etc.) in sintering is acquired (step S32). Calculation is performed to obtain design data with an offset corresponding to the adhesive layer as necessary.

  In the CAM system 4, the design data acquired in step S32 is taken in, and CAM data for controlling the additive manufacturing apparatus is acquired (step S33).

In the additive manufacturing apparatus, the CAM data acquired in step S33 is taken in, the additive manufacturing apparatus is controlled based on the CAM data, and the replacement occlusal surface portion shown in FIG. 8 is manufactured (step S34).
The replacement occlusal surface portion is completely sintered according to a conventional method to obtain the replacement occlusal surface portion (step S35).
Post-processing such as correction of the shape of the occlusal surface portion for replacement and polishing is performed according to a conventional method (step S36).
The replacement occlusal surface is bonded to the bottom using a dental adhesive (step S37).

FIG. 9 is a flowchart showing a method of manufacturing the replacement occlusal surface portion by using titanium as the replacement material and processing the titanium block with an NC cutting / grinding apparatus in FIG.
In the measuring means 1, the entire occlusal surface portion from which the joint portion is deleted and the functional occlusion removed from the bottom portion is measured, and the occlusal surface portion including the occlusal surface side shape and the mating surface side shape of the occlusal surface portion and the bottom portion is measured. Measurement data of the entire shape is acquired (step S41).

  In the CAD system 2, the measurement data acquired in step S41 is acquired, the three-dimensional shape data of the occlusal surface portion is acquired, and the material of the replacement occlusal surface portion is titanium based on the three-dimensional shape data. Design data for grinding is acquired (step S42). In this case, usually, calculation is performed in which data relating to the rest for holding the titanium block in the NC cutting / grinding apparatus is added to the design data of the replacement occlusal surface portion. Calculation is performed to obtain design data with an offset corresponding to the adhesive layer as necessary.

  The CAM system 4 takes in the design data acquired in step S42, and acquires CAM data (machining control data) for controlling the NC cutting / grinding apparatus (step S43).

In the NC cutting / grinding device, the CAM data acquired in step S43 is taken in, the NC cutting / grinding device is controlled based on the CAM data, and the titanium block is cut and ground to produce the replacement occlusal surface portion ( Step S44). The rest is removed thereafter.
Post-processing such as shape correction and polishing of the replacement occlusal surface portion is performed according to a conventional method (step S45).
The replacement occlusal surface is bonded to the bottom using a dental adhesive (step S46).

FIG. 10 shows a replacement material in FIG. 3 which is made of a zirconia replacement material, filled with powdered zirconia, and manufactured by a means for manufacturing a replacement occlusal surface mold for forming, for example, an NC cutting / grinding apparatus. It is a flowchart which shows the method of manufacturing the occlusal surface part for medical use.
In the measuring means 1, the entire occlusal surface portion from which the joint portion is deleted and the functional occlusion removed from the bottom portion is measured, and the occlusal surface portion including the occlusal surface side shape and the mating surface side shape of the occlusal surface portion and the bottom portion is measured. Measurement data of the entire shape is acquired (step S51).

  In the CAD system 2, the measurement data acquired in step S51 is acquired, the three-dimensional shape data of the occlusal surface portion is acquired, the material of the replacement occlusal surface portion is zirconia based on the three-dimensional shape data, and the powder zirconia is filled. In order to mold, design data of a mold (negative mold) that anticipates the shrinkage rate in complete sintering of zirconia is acquired (step S52). The three-dimensional shape data of the mold (negative) is obtained by inverting the three-dimensional shape data of the occlusal surface. If necessary, calculation for obtaining design data with an offset corresponding to the adhesive layer is performed.

  The CAM system 4 takes in the design data acquired in step S52 and acquires CAM data (machining control data) for controlling the NC cutting / grinding apparatus (step S53).

In the NC cutting / grinding apparatus, the CAM data acquired in step S53 is taken in, the NC cutting / grinding apparatus is controlled based on the CAM data, and the replacement occlusal surface forming dies 31, 31 shown in FIG. Manufactured (step S54). If a synthetic resin is used for the mold, the cost becomes low.
In addition, you may manufacture the occlusal surface part shaping | molding die for substitution with an additive manufacturing apparatus.

The obtained molds 31, 31 are filled with powdered zirconia as shown in FIG. 11B to form the replacement occlusal surface 32 (step S55).
As shown in FIG. 11C, the replacement occlusal surface portion 32 is taken out from the molds 31, 31 (step S56).
The replacement occlusal surface portion is completely sintered to obtain a replacement occlusal surface portion (step S57).
Post-processing such as shape correction and polishing of the replacement occlusal surface portion is performed according to a conventional method (step S58).
The replacement occlusal surface is bonded to the bottom using a dental adhesive (step S59).

  In the case where the replacement material is a composite resin, since the uncured composite resin is polymerized and cured, for example, since it can be performed according to the method of FIGS. 7 and 10 described above, detailed description is omitted. It is not limited to this.

The system for manufacturing the replacement occlusal surface portion is not limited to a dedicated system suitable for the specific replacement material shown in FIG. 1, and may be a general-purpose system suitable for a plurality of replacement materials.
FIG. 12 shows a system for manufacturing a replacement occlusal surface portion having a plurality of replacement occlusal surface portion manufacturing means.

  As shown in FIG. 12, the system for manufacturing the replacement occlusal surface portion includes a measuring means 41, a CAD system 42, a storage unit 43, a CAM system 44, a replacement occlusal surface portion manufacturing means 45, and a replacement occlusal surface portion manufacturing means 46. I have. The CAD system 42 is connected to the measuring unit 41, the storage unit 43, and the CAM system 44. The replacement occlusal surface part manufacturing unit 45 and the replacement occlusal surface part manufacturing unit 46 are connected to the CAM system 44, respectively.

  The replacement occlusal surface part manufacturing means 45 can be exemplified by an NC cutting / grinding apparatus, and the replacement occlusal surface part manufacturing means 46 can be exemplified by an additive manufacturing apparatus.

  The storage unit 43 stores necessary data and the like corresponding to the replacement material so that the design data of the replacement occlusal surface corresponding to the plurality of replacement materials can be obtained.

  When the replacement material and the replacement occlusal surface manufacturing means are specified, processing suitable for the replacement material and the replacement occlusal surface manufacturing means is performed. The operation of each component when the replacement material and the replacement occlusal surface manufacturing means are specified in the general-purpose system suitable for a plurality of replacement materials when the replacement material and replacement occlusal surface manufacturing means are specified are the replacement material, Since it is the same as the operation of the dedicated system in FIG. 1 in which the replacement occlusal surface portion manufacturing means is designated, detailed description will be omitted.

DESCRIPTION OF SYMBOLS 1 Measuring means 2 CAD system 3 Memory | storage part 4 CAM system 5 Replacement occlusal surface part manufacturing means

Claims (8)

An artificial molar made of either a synthetic resin or a composite material of a synthetic resin and a ceramic, having a double structure of an occlusal surface part and a bottom part where functional occlusion was obtained, and the occlusal surface part and the bottom part joined at a joint part A replacement occlusal surface portion made of a replacement material selected from a metal, a ceramic, and a composite resin for replacing the occlusal surface portion, using a CAD / CAM system,
The CAD system acquires design data corresponding to the replacement material of the replacement occlusal surface based on the three-dimensional shape data of the occlusal surface;
A step in which the CAM system acquires CAM data of the replacement occlusal surface portion according to the replacement occlusal surface portion manufacturing means based on the design data;
A method for producing a replacement occlusal surface portion of an artificial molar, wherein the replacement occlusal surface portion manufacturing means includes a step of manufacturing a replacement occlusal surface portion controlled based on the CAM data.   The occlusal surface side of the occlusal surface portion is removed from the bottom portion by removing the joint portion of the artificial molar having a double structure of the occlusal surface portion and the bottom portion from which the functional occlusion was obtained. 2. The artificial molar according to claim 1, wherein the entire shape including the shape on the mating surface side of the shape and the bottom is three-dimensional shape data acquired by a CAD system based on measurement data measured by the measuring means. Manufacturing method of occlusal surface part for replacement.   The three-dimensional shape data of the occlusal surface portion includes the shape of the joint portion of the artificial molar having a double structure of the occlusal surface portion and the bottom portion where the functional occlusion is obtained. CAD based on the three-dimensional shape data corresponding to the three-dimensional shape data based on the measured measurement data and the mating surface side shape of the bottom portion of the occlusal surface portion in the design stage before the functional occlusion marking read out from the storage unit The method for manufacturing an occlusal surface part for replacement of an artificial molar according to claim 1, which is three-dimensional shape data acquired by the system.   4. The method of manufacturing an artificial occlusal replacement occlusal surface according to claim 1, 2 or 3, wherein the CAM system acquires design data corresponding to the replacement material of the replacement occlusal surface through communication means. .   5. The method for manufacturing a replacement occlusal surface portion of an artificial molar according to claim 1, wherein the replacement occlusal surface portion manufacturing means is means for cutting and grinding a block of replacement material.   5. The method for manufacturing an occlusal surface part for replacement of an artificial molar according to claim 1, wherein the replacement occlusal surface part manufacturing means is a layered modeling means of a replacement material.   The method for manufacturing an occlusal surface part for replacement of an artificial molar according to claim 5 or 6, wherein the replacement material is zirconia. The CAD system reverses the three-dimensional shape data of the occlusal surface portion, and acquires design data of a mold corresponding to the replacement material of the replacement occlusal surface portion based on the inverted three-dimensional shape data;
A step in which the CAM system acquires the CAM data of the replacement occlusal surface mold according to the manufacturing means of the replacement occlusal surface mold based on the design data;
2. The method for producing a replacement occlusal surface part for artificial molars according to claim 1, wherein the replacement occlusal surface part forming die manufacturing means includes a step of manufacturing a replacement occlusal surface part forming die controlled based on the CAM data.

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