JP2018171308A - Artificial tooth molding data generation method, artificial tooth molding data generation program, artificial tooth manufacturing method, and artificial tooth manufacturing program - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain an accurately molded artificial tooth.SOLUTION: A molding design system generates impression data on an artificial tooth to be formed, from acquired impression information (step 102); on the basis of a material to be used for molding and a baking condition, predicts a contraction amount (step 104); corrects the impression data on the basis of a result of the prediction to generate three-dimensional molding data to be used for the molding (step 106); and performs molding and baking on the basis of the molding data (steps 108, 110). Thereby, the artificial tooth determined using the impression information can be manufactured accurately.SELECTED DRAWING: Figure 5

Description

    The present invention relates to an artificial tooth modeling data generation method, an artificial tooth modeling data generation program, an artificial tooth manufacturing method, and an artificial tooth manufacturing program.

Conventionally, restorations and prostheses (inlays, partially coated crowns, fully coated crowns, bridges, partially dentures, fully dentures, implant superstructures, etc.) that are installed in the oral cavity during dental treatment and artificial products used for them Most teeth have been manufactured by hand.
In recent years, the manufacture of artificial teeth and denture bases using CAD (Computer Aided Design) / CAM (Computer Aided Manufacturing) systems has been proposed.

  For example, Patent Document 1 proposes to manufacture a denture and a denture base by stacking layers of a composition containing a photocurable viscous mixture using a three-dimensional printer based on information generated by CAD / CAM. Yes. In Patent Document 1, since the conventional dental composition is not applicable to 3D printing due to its slow reactivity and putty, it has a low viscosity, an appropriate curing speed, and a minimum shrinkage. And proposes a simple and easily photocurable liquid resin composition formulated to be suitable for the construction of denture bases and artificial teeth using 3D printing methods with excellent mechanical properties .

  In Patent Document 2, a three-dimensional structure such as a three-dimensional living body model, an implant, or an artificial bone can be obtained without changing its shape even when exposed to high temperatures by autoclave or the like. An imaging composition suitable for production by a prototype method is proposed.

On the other hand, in an artificial tooth or a denture base using an artificial tooth as a bed denture, a large load acts by being mounted in the oral cavity. As a resin material used for modeling in a 3D printer, a photocurable resin is generally used. However, a photocurable resin is required to have a material and process more suitable for use in an oral cavity as an artificial tooth or a denture. ing.
From here on, attempts have been made to improve the finish of artificial teeth by changing the resin material for modeling artificial teeth, performing a sintering process for sintering the modeled artificial teeth, and the like.

  For example, in Patent Document 3, as biological hard tissue filler, shape data adjusted by a predetermined value is formed with respect to a measurement value obtained by measuring the shape of a prosthetic part in a living body, and the formed shape data Based on this, it has been proposed to use a fired body obtained by forming a prosthetic mold and then filling and curing the mixture of ceramic powder and curable resin in the prosthetic mold. Patent Document 3 proposes to use the inverse multiple of the shrinkage rate as a value for adjusting the shape data because shrinkage deformation occurs in the mixed resin by firing.

JP-T-2006-525150 International Publication No. 2007/122804 JP 2010-005230 A

  However, since artificial teeth and dentures are mounted in the oral cavity, slight differences in size and shape are perceived sensitively, causing the wearer to feel uncomfortable or uncomfortable.

  SUMMARY OF THE INVENTION The present invention has been made in view of the above-described facts. An artificial tooth modeling data generation method, an artificial tooth modeling data generation program, an artificial tooth manufacturing method, and an artificial tooth manufacturing program capable of manufacturing an artificial tooth with high accuracy. The purpose is to provide.

Specific embodiments for solving the above problems are as follows.
<1> Generation step for generating three-dimensional impression data of the artificial tooth to be formed, and shrinkage when a modeled object modeled by a three-dimensional modeling apparatus based on the three-dimensional modeling data is baked by a baking apparatus under predetermined baking conditions Prediction step for predicting the amount using predetermined prediction information, and impression data of the artificial tooth so that the dimension of the shaped article after firing is the same as the dimension of the artificial tooth to be formed based on the prediction result A correction step of correcting and generating the three-dimensional modeling data.

<2> The artificial tooth modeling data generation method according to <1>, wherein the prediction information includes a material used for modeling in the three-dimensional modeling apparatus, and firing conditions of a firing time and a firing temperature in the firing apparatus.
<3> The prediction information includes the three-dimensional modeling data used for modeling the artificial tooth to be formed and the three-dimensional sintering data after firing the modeled article <1> or <2>. Method for generating modeling data for artificial teeth.
<4> An acquisition step of acquiring the three-dimensional sintered data from the shaped object fired by the firing device, the impression data of the artificial tooth to be formed, the prediction result for the impression data of the artificial tooth to be formed, The update step of updating the prediction information based on the generated three-dimensional modeling data and the acquired three-dimensional sintering data, according to any one of <1> to <3> Artificial tooth modeling data generation method.
<5> The artificial tooth according to any one of <1> to <4>, wherein the impression data of the artificial tooth to be formed is impression data of an artificial tooth in which a root side of the artificial tooth is cut to form a denture Modeling data generation method.
<6> An artificial tooth modeling data generation program for causing a computer to execute each step of the artificial tooth modeling data generation method according to any one of <1> to <6>.

<7> A reception step of receiving impression information including dimensions of the artificial tooth to be formed, a generation step of generating three-dimensional impression data of the artificial tooth to be formed from the impression information, and three-dimensional based on three-dimensional modeling data Prediction step for predicting the amount of shrinkage when the modeled object modeled by the modeling apparatus is baked by the baking apparatus under the predetermined baking conditions using the predetermined prediction information, and the size of the modeled object after baking based on the prediction result Correcting the impression data of the artificial tooth so as to be the same as the size of the artificial tooth to be formed, and generating the three-dimensional modeling data, and the three-dimensional modeling generated by the correction step Based on the data, a modeling step of generating a modeled object by the three-dimensional modeling apparatus, and a baking step of baking the modeled object by the baking apparatus to form the artificial tooth , Process for producing an artificial tooth comprising a.

<8> Comparing the step of obtaining three-dimensional sintering data from the fired shaped article fired by the firing step, the three-dimensional sintering data, and the impression data of the artificial tooth to be formed An evaluation step for evaluating the fired molded article, and the method for manufacturing an artificial tooth according to <7>.
<9> The artificial tooth manufacturing method according to <8>, including an update step of updating the prediction information based on an evaluation result of the evaluation step.
<10> An artificial tooth manufacturing program for causing a computer to execute each step of the artificial tooth manufacturing method according to any one of <7> to <9>.

  As described above, according to the present invention, there is an effect that an artificial tooth can be manufactured with high accuracy.

It is a schematic block diagram of the modeling design system which concerns on this Embodiment. It is a flowchart which shows the manufacturing process of the artificial tooth which concerns on this Embodiment. It is a perspective view which shows the outline of the denture base in which an artificial tooth is used. It is a perspective view which shows the outline of the magnitude | size of the artificial tooth to form, a molded article, and a sintered compact. It is a flowchart which shows the outline of the manufacturing process of an artificial tooth. It is a schematic perspective view which shows the artificial tooth of an Example.

Hereinafter, an example of an embodiment of the present invention will be described in detail with reference to the drawings.
FIG. 2 shows an outline of the manufacturing process of the artificial tooth (bed denture) according to the present embodiment, and FIG. 3 shows an example of a denture base in which the artificial tooth is used.

  As shown in FIG. 2, the artificial tooth manufacturing process includes an impression acquisition process 80 as a reception unit, a modeling design process 82 as a design unit, a modeling process 84 as a modeling unit, a curing process 86 as a curing unit, and a firing unit. The baking process 88 is included. The artificial tooth is generated through an impression acquisition process 80, a modeling design process 82, a modeling process 84, a curing process 86, and a baking process 88, and is finished in a finishing process 90. The curing process 86 may be included in the modeling process 84.

  In the modeling process 84 of the present embodiment, a rapid prototype method is applied to create a three-dimensional image (three-dimensional model) of the artificial tooth. As a modeling technique in the modeling process 84, in addition to a binder injection method, a directional energy volume method, a material extraction method, a material injection method, a powder bed fusion method, a sheet lamination method, a liquid tank photopolymerization method, a lamination modeling method, Any of an optical modeling method, a powder modeling method, a hot melt lamination method, an ink jet method, and the like may be applied. In the present embodiment, a photocurable resin (photocurable ceramic composite resin; hereinafter also referred to as a photocurable ceramic resin) is used as a resin material for manufacturing artificial teeth. An additive manufacturing technique to which the method is applied, a 3D printer (3D printing apparatus) as a so-called three-dimensional modeling apparatus is used.

  The impression acquisition process 80 acquires (accepts) impression information related to the dimensions of the artificial teeth to be manufactured. Moreover, in the impression acquisition process 80, the material (component of a photocurable ceramic resin) used for modeling of an artificial tooth may be specified, and the material used for the manufacture of the artificial tooth (component of the material) is included in the impression information. ) Is preferably included. Furthermore, it is preferable that the impression information includes a firing condition when firing the shaped object in the firing step 88, and in the impression acquisition step 80, the firing condition may be obtained.

  The artificial tooth dimensions include length, width and thickness, and the artificial tooth dimensions include shape. The information on the artificial tooth includes a position in the oral cavity. In each artificial tooth, the length may be the length in the vertical direction (Z-axis direction), the width may be the length in the X-axis direction, and the thickness may be the length in the Y-axis direction. .

  The modeling design process 82 generates impression data that is three-dimensional data of artificial teeth based on the impression information. Further, in the modeling design process 82, based on the generated impression data, the shrinkage amount at the time of firing is predicted using prediction information described later, and modeling data that is three-dimensional data used in the modeling process 84 is generated. Moreover, in the modeling design process 82, the baking conditions applied in the baking process 88 are set with the material (component of a photocurable ceramic resin) used for modeling of an artificial tooth.

  The modeling process 84 models the artificial tooth using the set artificial tooth material. In the modeling process 84, modeling is performed based on the modeling data created in the modeling design process 82. In the curing step 86, the artificial tooth model using the photo-curable ceramic resin is further photocured.

  In the firing step 88, the hardened artificial tooth model is fired based on the firing conditions set in the modeling design step 82, thereby generating a sintered product from which organic components and the like have been removed from the artificial tooth model. . Thereafter, in the finishing step 90, the sintered product is finished with various finishing treatments such as coloring, so that an artificial tooth as a product is finished. Further, when the artificial tooth is finished as a plate denture, the plate denture is assembled in the finishing step 90.

  As shown in FIG. 3, the denture base 14 in which the artificial tooth 10 is used includes a denture base 14. The denture base 14 has a floor portion 16 to which the artificial tooth 10 is fixed. A plurality of socket portions 18 are formed on the floor portion 16. The denture base 14 is mounted on the upper or lower jaw side in the oral cavity. In the denture base 14 of the present embodiment, the floor portion 16 is curved, and when being mounted in the oral cavity, the inner side of the curvature of the floor portion 16 is set to the lingual side on the back side of the oral cavity, and the outer side of the curve Is placed on the lip side outside the oral cavity.

  At least two of the plurality of socket portions 18 are adjacent to each other. In the denture base 14 according to the present embodiment, all the socket portions 18 are arranged in a row on the curved floor portion 16, and the plurality of socket portions 18 are adjacent to each other in the row direction.

  The artificial tooth 10 used as the bedded denture 12 is shaped in a state in which a so-called tooth cut is performed in which the root portion is removed. Each shape of the socket part 18 is made into the shape of a shallow hole, and is matched with the shape of the root of the artificial tooth 10 manufactured by being cut into a tooth. Each of the socket parts 18 is fitted with an artificial tooth 10 manufactured in a state where the teeth are cut and fixed by an adhesive.

  On the other hand, as shown in FIG. 2, an evaluation step 92 is provided in the artificial tooth manufacturing step according to the present embodiment. In the evaluation step 92, it is evaluated whether or not a sintered product having the same dimensions as the artificial tooth 10 to be formed is obtained. At this time, in the evaluation process 92, the sintering data as the three-dimensional data of the sintered product is acquired, the impression data of the artificial tooth 10 formed from the modeling design process 82 is acquired, and the impression data and the modeling data are compared. By doing so, the sintered product is evaluated. In the evaluation step 92, the sintered product evaluated as having the same dimensions as the artificial tooth 10 to be formed is finished as the artificial tooth 10 (or the denture base 12) in the finishing step 90.

  In FIG. 4, the artificial tooth 10 to be formed, a modeled article of the modeled artificial tooth 10 (modeled object represented by the modeled data) 10 </ b> A, and a sintered product obtained by firing the modeled object 10 </ b> A (represented by the sintered data) The outline of the sintered product 10B is shown in a perspective view. In FIG. 4, the tooth-cut artificial tooth 10 and a shaped article 10 </ b> A and a sintered article 10 </ b> B in the manufacturing process of the artificial tooth 10 are shown. In FIG. 4, the X, Y, and Z axes are shown with the root side (the denture base 14 side) of the artificial tooth 10 being the positive side of the Z axis.

  In the manufacturing process of the present embodiment, a modeled product 10A of the artificial tooth 10 is generated using a photocurable ceramic resin, and the generated modeled product 10A is fired to form a sintered product 10B. For this reason, there is a difference in dimensions between the modeled object 10A and the sintered object 10B obtained by firing the modeled object 10A, and the sintered object 10B is contracted with respect to the modeled object 10A.

  The shrinkage of the sintered product 10B is affected by the material of the modeled product (component of the photocurable ceramic resin), firing conditions, and the like. In the firing step 88, a temperature history such as a firing time or a temperature change in the firing time is determined as a firing condition. Further, it is considered that the shrinkage of the sintered product 10B is influenced by the environmental temperature, the environmental humidity, and the like when the model 10A is modeled.

  From here, as prediction information, the material of the resin used for the modeling of the modeled object (the resin component of the photocurable ceramic resin and the component ratio for each resin component), the modeling environment (for example, temperature and humidity in the modeling process 84), In addition to the firing conditions (for example, firing time, firing temperature, and temporal change in firing temperature), information associated with modeling data and sintering data is used.

  In the modeling design process 82 of the present embodiment, a contraction amount (a contraction rate may be sufficient) when generating the sintered product 10B from the modeled object 10A is predicted, and the impression data is corrected according to the predicted contraction amount. By generating modeling data (modeled object 10A), a sintered product 10B having the same dimensions as the artificial tooth 10 formed by dimensions and the like is obtained. In the modeling design process 82, the prediction information is updated using the sintering data acquired in the evaluation process 92. In addition, in the evaluation step 92, when it is evaluated that there is a difference in the dimensions or the like between the artificial tooth 10 to be formed and the sintered product, the impression data is corrected again based on the updated prediction information, and the modeling data is obtained. Regeneration is performed, and the sintered product is recreated based on the regenerated modeling data.

  FIG. 1 is a block diagram showing a schematic configuration of a modeling design system 20 according to the present embodiment. In the present embodiment, the modeling design system 20 has a processing function in the modeling design process 82. The modeling design system 20 may be responsible for the processing function in at least one of the impression acquisition process 80 and the evaluation process 92, and the modeling design system 20 may be responsible for the processing function in the modeling process 84.

  In the present embodiment, a CAD (Computer Aided Design) system is used in the modeling design system 20, and a processing function in the modeling design process 82 is carried out by the CAD system. Moreover, the modeling design system 20 of this Embodiment bears the processing mechanism in the impression acquisition process 80, the modeling process 84, and the evaluation process 92 as an example, and can function also as a manufacturing system of the artificial tooth 10. .

  The modeling design system 20 includes an arithmetic processing unit 22, a main storage unit 24, an input unit 26, an output unit 28, an auxiliary storage unit 30, and an interface unit 32. The arithmetic processing unit 22, the main storage unit 24, and an input unit 26, an output unit 28, an auxiliary storage unit 30, and an interface unit 32 are configured by a computer connected to each other via a bus 34.

  The main storage unit 24 stores an operation program (OS) or the like of the arithmetic processing unit 22. The arithmetic processing unit 22 reads out and executes the operation program from the main storage unit 24 so that the modeling design system 20 operates. To do. The input unit 26 is provided with input devices such as a keyboard, a mouse, and a tablet, and the output unit 28 is provided with output devices such as a display and a printer.

  On the other hand, the interface unit 32 of the modeling design system 20 is used for a three-dimensional scanner (hereinafter referred to as a 3D scanner) 36 as a three-dimensional reading device used as a reading unit in the impression acquisition process 80 and the evaluation process 92, and a modeling process 84. A three-dimensional printer (hereinafter referred to as a 3D printer) 38 as a three-dimensional modeling apparatus and a firing apparatus 40 used in the firing step 88 are connected. In the present embodiment, an environmental sensor 42 that detects environmental conditions such as temperature and humidity during modeling in the modeling process 84 is provided, and the environmental sensor 42 is connected to the modeling design system 20 together with the 3D printer 38. . The 3D scanner 36, the 3D printer 38, the baking apparatus 40, and the environment sensor 42 can transmit and receive data (information) to and from each other via a public communication network such as a LAN (Local Area Network) or the Internet. It is connected to the. As a result, even if the 3D scanner 36, the 3D printer 38, the baking apparatus 40, and the modeling design system 20 are provided in different locations (for example, remote locations), the modeling design system 20 can provide the 3D scanner 36, the 3D printer 38, and The baking apparatus 40 is controllable.

  As the auxiliary storage unit 30 of the modeling design system 20, for example, a nonvolatile storage medium capable of rewriting information such as a hard disk device is used. For example, a modeling design program 44 such as commercially available CAD software (3D CAD software) is installed in the auxiliary storage unit 30. The auxiliary storage unit 30 stores an impression acquisition program 46, a modeling program 48, a firing program 50, an evaluation program 52, and the like. Further, the auxiliary storage unit 30 is formed with a database 54 of prediction information, and stores a prediction program 56 and a learning program 58.

  The arithmetic processing unit 22 reads out and executes the modeling design program 44, the impression acquisition program 46, the modeling program 48, the firing program 50, the evaluation program 52, the prediction program 56, and the learning program 58 from the auxiliary storage unit 30, thereby performing the modeling design. The system 20 includes a modeling design section (modeling design process 82), an impression acquisition section (impression acquisition process 80), a modeling section (modeling process 84), a firing section (firing process 88), an evaluation section (evaluation process 92), and a prediction section. The processing function as the (modeling design process 82) and the learning unit (modeling design process 82) is executed.

  The predicted information database 54 includes a material of a modeled object (information for specifying the content of the resin used as the photo-curable ceramic resin and the content of each content, or the product name of the resin manufacturer), a modeling environment (for example, , Temperature and humidity in the modeling step 84), and firing conditions (for example, firing time, firing temperature, and temporal change in firing temperature, etc., collectively referred to as temperature history) are associated and stored. Further, the database 54 corresponds to a combination of a material of a modeled object (a component of a photocurable ceramic resin), a modeling environment (for example, temperature and humidity in the modeling process 84), and a firing condition (for example, a temperature history). The amount of shrinkage (and shrinkage) of the sintered product is stored. As these prediction information, a preset initial value (default value) may be stored, or may be sequentially accumulated by manufacturing the artificial tooth 10.

  The prediction information stored in the database 54 may store model data, average data, or reference data indicating the average artificial tooth 10 or the general artificial tooth 10.

Further, the prediction information stored in the database 54 includes three-dimensional data (modeling data) of a modeled object before firing, three-dimensional data (sintered three-dimensional data after sintering), and three-dimensional data of a sintered object obtained by firing the modeled object. Data) is stored. The modeling data and the sintering data include dimensions and the like (length, thickness, width, shape, tooth position, etc.) corresponding to each tooth type. Further, the prediction information accumulated in the database 54 includes the difference between the shaped object and the sintered object obtained from the modeling data and the sintered data, the shrinkage amount of the sintered object, and the shrinkage rate of the sintered object.
Further, each time the artificial tooth 10 is manufactured, the database 54 accumulates impression data that is three-dimensional data of the artificial tooth 10 obtained from the impression information of the artificial tooth 10 to be formed.

  In the modeling design system 20, various types of prediction information are stored in the database 54, and by using the stored prediction information, it is possible to manufacture a sintered product with high accuracy for the artificial tooth 10 to be formed.

  Next, the modeling design system 20 (modeling system) of the present embodiment will be specifically described with reference to FIG. FIG. 5 is a flowchart showing the manufacturing process of the artificial tooth 10 in the modeling design system 20.

  In manufacturing the artificial tooth 10, in the first step 100, impression information of the artificial tooth 10 to be formed is acquired. For obtaining impression information, for example, when there is a sample (for example, an actual tooth) of the artificial tooth 10 to be formed, the sample is mounted on the 3D scanner 36 and read. Thereby, a three-dimensional image of the sample is obtained. Moreover, when there is designation | designated of the material used for manufacture of the artificial tooth 10, the information regarding the material (The content of resin, the ratio for every containing component, and the brand name of a resin manufacturer may be received. In addition, if there are designations of firing conditions such as firing temperature and firing time when the artificial tooth 10 is manufactured, the designation of firing conditions is received.

  In addition, as for impression information such as a sample three-dimensional image, the modeling design system 20 may accept impression information input via a network. When three-dimensional impression data is input instead of the sample three-dimensional image, the three-dimensional impression data may be received as impression information.

  In the next step 102, impression data is generated as three-dimensional data of the artificial tooth 10 to be formed based on the acquired impression information. The impression data is generated using commercially available 3D CAD software or the like, and the impression data can be created from impression information (a sample three-dimensional image or the like). Moreover, when manufacturing the artificial tooth 10 used as the denture base 12, the impression data of the shape cut by the teeth are created.

  When the impression data is created, in step 104, the amount of shrinkage that occurs in the sintered product when the shaped product is fired to produce the sintered product is predicted. At this time, when the resin material and baking conditions are specified as the impression information, the shrinkage amount is read from the prediction information based on the specified resin material and baking conditions. In addition, when at least one of the resin material and the firing condition is not designated, the undesignated condition (at least one of the resin material and the firing condition) and the 3D printer 38 connected to the modeling design system 20 and the firing are used. Set according to the device 40.

  When the shrinkage amount is predicted, the environment sensor 42 detects the temperature and humidity (environment temperature and environment humidity) of the installation environment of the 3D printer 38 used for modeling, and the shrinkage amount including the environment temperature and the environment humidity is determined. It is more preferable to predict.

  Thereafter, in step 106, the impression data is corrected based on the predicted contraction amount, thereby generating modeling data as three-dimensional data for modeling the modeled object. When correcting impression data based on the predicted shrinkage amount (shrinkage rate), the impression data is enlarged in the Z-axis direction, and the enlarged impression data is divided along the Z-axis in accordance with the resolution of the 3D printer 38. Thereafter, each divided data (data indicating a planar shape) is enlarged along the XY axis plane. Thereby, impression data is correct | amended easily and with high precision, and modeling data can be produced | generated.

  When modeling data is created in this way, the process proceeds to step 108 to perform modeling processing. In the modeling process, the resin of the set material is stacked in layers based on the modeling data using the 3D printer 38. Thereby, 10A of modeling objects modeled based on modeling data are obtained. The modeling design system 20 detects the environmental conditions (environmental temperature and environmental humidity) of the installation environment of the 3D printer 38 at the time of modeling by the environmental sensor 42, stores the detected environmental conditions in the database 54, and uses them as prediction information. include.

  In step 110, a firing process is performed on the shaped article 10A that has been shaped and further cured. The firing process uses the firing device 40 to fire the shaped article 10A based on the set firing time and firing temperature. Thereby, the sintered product 10B is obtained. The modeling design system 20 acquires a temperature history for the sintered product 10B that has been fired, and stores it in the database 54 as prediction information.

  Thereafter, in step 112, the sintered product 10B obtained by firing is mounted on the 3D scanner 36 and read. Sintering data, which is three-dimensional data of the sintered product 10B, is obtained from the three-dimensional image of the sintered product 10B obtained in this way.

  In step 114 and step 116, the sintered product 10B for the artificial tooth 10 is evaluated by comparing the sintered data with the impression data. At this time, the size of the sintered product 10B indicated by the sintering data is compared with the size and the like of the artificial tooth 10 (the size, shape, and dimensions included in the impression information include length, thickness, and width). If the size of the sintered product 10B matches or can be considered to match the size of the artificial tooth 10 (when the size of the sintered product 10B is within a predetermined error range with respect to the artificial tooth 10), good And an affirmative determination is made in step 116. The shape is indicated by three-dimensional data.

  If an affirmative determination is made in step 116, the process proceeds to step 118 and the sintering data is stored in the database 54 in association with the original impression data.

  On the other hand, when it cannot be considered that the size of the sintered product 10B matches the size of the artificial tooth 10 (when the size of the sintered product 10B exceeds the predetermined error range with respect to the artificial tooth 10), It is evaluated and a negative determination is made in step 116.

  If a negative determination is made in step 116, the routine proceeds to step 120. In this step 120, a difference (difference, shrinkage amount and shrinkage rate) of the sintering data with respect to the modeling data is calculated, and the modeling data together with the calculation result, modeling data, resin material, modeling environment information, firing temperature, firing It is stored in the database 54 in association with time, firing history, and the like. At the same time, in step 120, the prediction information is updated.

  Thereafter, the process proceeds to step 104, where the original impression data is corrected based on the updated prediction information, and the artificial tooth 10 is remade. Moreover, when the sintered product 10B evaluated as good is created, the created sintered product 10B is finished as the artificial tooth 10 and the denture 12 is created.

  As described above, the modeling design system 20 generates impression data of the artificial tooth 10 to be formed, predicts a contraction amount when the model 10A is fired under a predetermined firing condition, and creates modeling data based on the prediction result. Is generated. For this reason, the sintered product 10B suitable for the artificial tooth 10 can be formed with high accuracy, and the artificial tooth 10 to be formed can be manufactured with high accuracy.

  Moreover, since the prediction information used for prediction includes the material of the resin, which is a material used for modeling, and the firing time and firing temperature applied as firing conditions, the shrinkage amount of the sintered product 10B can be predicted with high accuracy. In addition, it is preferable to include environmental conditions such as environmental temperature and environmental humidity at the time of modeling in the prediction information. Thereby, for example, the moisture content in the model changes, and the shrinkage after firing changes. Even so, the amount of contraction can be predicted with high accuracy.

  Furthermore, it is preferable that the prediction information includes impression data of the artificial tooth 10 to be formed, modeling data of the modeled object 10A, and modeled data of the sintered product 10B, thereby requesting (requesting) the same artificial tooth 10 to be manufactured. ), The requested artificial tooth 10 can be manufactured with high accuracy.

  In the modeling design system 20, since the sintering data is acquired from the sintered product 10B and the prediction information is updated (learned) based on the acquired sintering data, as the number of artificial teeth 10 to be manufactured increases, The contraction amount can be predicted with higher accuracy, and the artificial tooth 10 can be manufactured with higher accuracy.

  Further, the modeling design system 20 generates impression data of the artificial tooth 10 from which the root side is removed (tooth cut), so that the artificial tooth 10 is used as the denture base 12 in the finishing step 90. Can be easily assembled.

  Furthermore, in the finishing step 90, the operator manually finishes the sintered product 10B as the artificial tooth 10 and attaches it to the denture base 14. For this reason, if the size of the sintered product 10B is different from the size of the artificial tooth 10 to be formed, it is necessary for the operator to perform a cutting operation or a polishing operation manually. In contrast, in the present embodiment, the sintered data 10B is evaluated by comparing the sintered data with the impression data, so that the work in the finishing step 90 becomes extremely easy.

  In addition, although the modeling design system 20 has the processing function with respect to the impression acquisition process 80, the modeling process 84, the baking process 88, and the evaluation process 92 in this Embodiment, it is not restricted to this. In addition to the modeling design system 20, a computer for control may be provided in the impression acquisition process 80, the modeling process 84, the baking process 88, and the evaluation process 92. In this case, the computer provided in each of the impression acquisition process 80, the modeling process 84, the baking process 88, and the evaluation process 92 can transmit and receive data via a LAN, a public communication line network, etc. It is preferable to be connected to. Thereby, from the reception of the request for the artificial tooth 10 to be formed to the manufacture of the sintered product 10B to be the artificial tooth 10 to be formed can be performed easily and with high accuracy.

  Hereinafter, an embodiment of the present invention will be described in detail. In this embodiment, the present invention is applied to the manufacture of artificial teeth, and the present invention is not limited to the following embodiments.

In the examples, artificial teeth were manufactured using the following materials and equipment.
・ Material: Ceramic resin for 3D printer (manufactured by Tethon 3D, components: porcelain powder, methacrylate monomer, methacrylate oligomer, initiator)
・ CAD software: Geometric Design X (3D Systems)
・ 3D printer: Desktop 3D printer Form1 + (Formlabs)
・ 3D printer software: Preform V2.10.2 (Formlabs)
-3D scanner: CaraDS360 Scan 3.2 (manufactured by Hereaus Kulzer)
UV curing device: HiLitePower (made by Hereaus Kulzer)
・ 3D analysis software: Netfabbb for Autodesk (manufactured by Autodesk)
-Electric furnace: FO100 (manufactured by Yamato Science Co., Ltd.)

<Making artificial teeth>
Maxillary denture design data (artificial tooth data, shape data) and teeth cut data of a patient were acquired, and artificial tooth data was corrected based on the teeth cut data using 3D CAD software. Thereby, each tooth cut data from right first tooth to right seventh tooth and left first tooth to left seventh tooth shown in FIG. 6 was created. In FIG. 6, each of the teeth is shown with the root portion facing upward.

  Next, the created artificial tooth data (each tooth cut data) is read into the 3D printer software, the shrinkage rate is predicted based on the materials used in the 3D printer and the firing conditions applied in the electric furnace, and the predicted shrinkage rate is taken into account. Then, each was enlarged by 19% in the X, Y, and Z axis directions (creation of modeling data based on prediction information).

  Next, using CAD software, artificial teeth represented by modeling data were arranged and tilted at an angle of 5-30% to support. The support was density (support number density): 1.0 and point size (support diameter): 1.0 to 1.2 mm.

Next, an artificial tooth was formed using a desktop 3D printer using a ceramic resin for a 3D printer.
After completion of the modeling process, the model was removed from the printer platform of the desktop 3D printer and immersed in isopropyl alcohol. After immersion for 10 minutes, the modeled object is taken out, dried, and then the artificial tooth part and the support part are separated, and the support part remaining on the artificial tooth part is removed using a dental handpiece, and the artificial tooth as a modeled article is obtained. Finished.
Next, the artificial tooth finished as a model was UV cured for 15 minutes using a UV curing device.

Thereafter, the UV-cured artificial teeth were sintered using an electric furnace. The firing temperature profile as the firing condition was set as follows.
・ 0 ° C-650 ° C (Temperature increase rate: 30 ° C / hr)
・ 650 ° C-1000 ° C (temperature increase rate: 95 ° C / hr)
・ 1000 ° C-1150 ° C (Temperature increase rate: 130 ° C / hr)
・ 1150 ° C (1 hr)
After firing, it was cooled and the fired artificial teeth were taken out.

<Evaluation of artificial teeth>
Based on the obtained floor shape data, a denture base was prepared by CAD / CAM. When artificial teeth were put into the artificial tooth pocket portion of the denture base, the artificial teeth before firing did not enter the socket portion, but the artificial teeth after firing entered the artificial tooth pocket portion without any problem.

  Each of the fired artificial teeth was scanned using a 3D scanner to obtain 3D data (three-dimensional data) after each firing. The error of the 3D scanner is about 30 μm.

  In addition, each artificial tooth before firing is scanned using a 3D scanner to obtain 3D data before firing.

  Table 1 shows 3D data before firing (size before sintering) and 3D data after firing (size after sintering) for each artificial tooth. In Table 1, “X”, “Y”, and “Z” indicate dimensions in the respective directions of the X axis, the Y axis, and the Z axis. Table 1 shows the shrinkage ratio before and after firing together with the volume before firing, the surface area before firing, the volume after firing, and the surface area after firing calculated for each artificial tooth.

As shown in Table 1, the artificial teeth before and after firing, for example, the average lengths in the X, Y, and Z axis directions contracted by 23%, 22%, and 24%, respectively. In addition to the different rates, there is also variation in the contraction rate itself of the axial length of each tooth. Also, the shrinkage rate of volume and surface area is different for each tooth.
Accordingly, since the shrinkage rate (axial length, volume, surface area) varies depending on the shape of each tooth, the shrinkage rate before and after firing is calculated for each of the first to seventh teeth on the left and right. Thus, it is expected that artificial teeth having no difference in size and shape can be obtained with respect to maxillary denture design data by recreating and manufacturing modeling data.

Next, using 5 patients as test subjects, a denture base actually provided with artificial teeth (bed dentures) was created, and the created denture bases were worn on each subject for 2 days, and hearing about the wearing feeling was performed. .
As a result, the impression that no discomfort or discomfort was produced in the oral cavity was obtained from any subject.

DESCRIPTION OF SYMBOLS 10 Artificial tooth 10A Modeling object 10B Sintered object 20 Modeling design system 36 3D scanner 38 3D printer (three-dimensional modeling apparatus)
40 Firing device 42 Environmental sensor

Claims (10)

A generation step for generating three-dimensional impression data of the artificial tooth to be formed;
A predicting step of predicting a shrinkage amount when a modeled object modeled by a three-dimensional modeling apparatus based on three-dimensional modeling data is baked by a baking apparatus under predetermined baking conditions using predetermined prediction information;
A correction step of correcting the impression data of the artificial tooth so that the dimension of the molded article after firing is the same as the dimension of the artificial tooth to be formed based on the prediction result, and generating the three-dimensional modeling data;
Method for generating artificial tooth modeling data including   The artificial tooth modeling data generation method according to claim 1, wherein the prediction information includes a material used for modeling in the three-dimensional modeling apparatus, and a firing condition of a firing time and a firing temperature in the firing apparatus.   3. The prediction information according to claim 1, wherein the prediction information includes the three-dimensional modeling data used for modeling the artificial tooth to be formed, and three-dimensional sintering data after firing the modeled article. Artificial tooth modeling data generation method. An acquisition step of acquiring the three-dimensional sintering data from the modeled object fired by the firing device;
The prediction information based on the impression data of the artificial tooth to be formed, the prediction result for the impression data of the artificial tooth to be formed, the generated three-dimensional modeling data, and the acquired three-dimensional sintering data. An update step to update;
The method for generating artificial tooth modeling data according to any one of claims 1 to 3, further comprising:   5. The artificial tooth according to claim 1, wherein the impression data of the artificial tooth to be formed is impression data of an artificial tooth that is made into a denture by removing the root side of the artificial tooth. 6. Modeling data generation method.   An artificial tooth modeling data generation program for causing a computer to execute each step of the artificial tooth modeling data generation method according to any one of claims 1 to 5. A reception step for receiving impression information including dimensions of the artificial tooth to be formed;
Generating the three-dimensional impression data of the artificial tooth to be formed from the impression information;
A predicting step of predicting a shrinkage amount when a modeled object modeled by a three-dimensional modeling apparatus based on three-dimensional modeling data is baked by a baking apparatus under predetermined baking conditions using predetermined prediction information;
A correction step of correcting the impression data of the artificial tooth so that the dimension of the molded article after firing is the same as the dimension of the artificial tooth to be formed based on the prediction result, and generating the three-dimensional modeling data;
Based on the three-dimensional modeling data generated by the correction step, a modeling step for generating a modeled object by the three-dimensional modeling apparatus;
A firing step of firing the shaped article by the firing apparatus to form the artificial tooth;
The manufacturing method of the artificial tooth containing this. Obtaining three-dimensional sintering data from the fired shaped article fired by the firing step;
An evaluation step for comparing the three-dimensional sintering data with the impression data of the artificial tooth to be formed, and evaluating the fired molded article;
The manufacturing method of the artificial tooth of Claim 7 containing this.   The method for manufacturing an artificial tooth according to claim 8, further comprising an update step of updating the prediction information based on an evaluation result of the evaluation step. On the computer,
The artificial tooth manufacturing program for performing each step of the manufacturing method of the artificial tooth of any one of Claims 7-9.