JP7207709B2 - Manufacturing method, prosthesis manufacturing support device and program - Google Patents

Description

TECHNICAL FIELD The present invention relates to a dental prosthesis, a manufacturing method, a prosthesis manufacturing support device, and a program.

Conventionally, techniques related to dental prostheses and methods of manufacturing the same have been proposed. For example, in Patent Document 1, a dental prosthesis to be mounted in a cavity or crowned on an abutment tooth has a structure that can be accurately fixed to the cavity or the abutment tooth, and this dental prosthesis is Disclosed are a method of designing using a computer and a method of manufacturing a dental prosthesis designed by this designing method using a CAD/CAM system or an apparatus using a CAD system. In these methods, the entire surface of the dental prosthesis facing the cavity or the abutment tooth, excluding a plurality of protrusions that come into contact with the cavity or the abutment tooth and, if necessary, a portion near the margin line Make sure that there is enough cement space in the In order to design this dental prosthesis crowned on the abutment tooth by computer, the abutment is based on the three-dimensional measurement data obtained by measuring a plaster model prepared based on the impression taken from the patient's oral cavity. A plurality of protrusions that contact the tooth and, if necessary, a portion near the margin line are provided, and a cement space is set in the entire surface facing the cavity or the abutment tooth except for the contact portion.

Further, Patent Document 2 discloses a dental measuring and processing system that makes it possible to obtain a highly accurate prosthesis. In the case of a crown, this dental measurement and processing system provides data on the occlusal surface of the model for creating the prosthesis, data on the region from the occlusal surface to the maximum ridge on the side surface, and the contact line between the abutment tooth and the crown ( Margin line) data, and in the case of prosthesis models with steep undulations, partial or complete dentures, etc., based on data showing the oral environment such as height and width at the time of occlusion , to process.

JP 2007-215763 A WO2001/091664

As in the conventional technology described above, CAD/CAM systems have recently been used to manufacture prostheses that fit abutment teeth and inner crowns. is thought to increase. In general, it is said that when the conus angle is 6 degrees, the most suitable retention force of the prosthesis for the abutment tooth or the like is exhibited. The cornus angle is half the cone angle formed by extending the taper of the axial surface on the side surface of the abutment tooth or inner crown. However, in reality, it is difficult to unify the conus angles of the abutment teeth and inner crowns to a specific angle due to factors such as the condition and position of the teeth. It is desired to create a prosthesis with high quality.

On the other hand, when creating a prosthesis with good compatibility corresponding to various conus angles, if the cement space for joining the outer surface of the abutment tooth and the inner surface of the prosthesis is fixed, the prosthesis with good angle compatibility Even if the prosthesis is manufactured, there are cases where the prosthesis is lifted when it is attached, making it difficult for dentists to attach the prosthesis, and on the contrary, the prosthesis cannot exhibit an appropriate holding force, making it easy to remove the prosthesis.

The present invention has been devised in view of such circumstances, and provides a dental treatment that secures good attachability, prevents the prosthesis from lifting during attachment, and provides an appropriate retention force to prevent the prosthesis from coming off. The present invention provides a prosthesis for use, a manufacturing method thereof, a prosthesis manufacturing support device, and a program.

In order to solve the above-mentioned problems, there is provided a method for manufacturing a dental prosthesis to be placed over an abutment tooth or an inner crown, comprising: measuring the conus angle of the abutment tooth or the inner crown; A method of manufacturing a dental prosthesis to determine the thickness of the cement space between the tooth or inner crown and the dental prosthesis, wherein measuring the conus angle of the abutment tooth or inner crown Measure the third conus angle at an arbitrary position and the fourth conus angle at a position substantially orthogonal to the position where the third conus angle was measured, and average the third conus angle and the fourth conus angle to cement A method of manufacturing a dental prosthesis is provided, characterized by determining a space .
According to this, by determining the thickness of the cement space between the abutment tooth or the like and the prosthesis based on the cornus angle, it is possible to secure good mountability, prevent the prosthesis from lifting during mounting, and achieve an appropriate thickness. Therefore, it is possible to provide a method for manufacturing a dental prosthesis that has a sufficient retention force to prevent the prosthesis from coming off. Furthermore, according to this, by determining the cement space from the average of two conus angles, a method for manufacturing a dental prosthesis that prevents both detachment and lifting over the entire circumference of the side surface of the abutment tooth or the like. can be provided.

In order to solve the above-mentioned problems, there is provided a prosthesis manufacturing assisting apparatus for assisting manufacturing of a dental prosthesis to be placed over an abutment tooth or an inner crown, wherein an image of the abutment tooth or the inner crown is captured. An image acquisition unit, a conus angle measurement unit for measuring the conus angle of the abutment tooth or the inner crown captured in the image, and a cement between the abutment tooth or the inner crown and the dental prosthesis based on the measured conus angle. a cement space determination unit that determines the thickness of the space; and an output processing unit that outputs the determined thickness of the cement space . The third conus angle and the fourth conus angle at a position substantially orthogonal to the position where the third conus angle was measured are measured, and the cement space determination unit determines the cement space from the average of the third conus angle and the fourth conus angle. There is provided a prosthesis manufacturing support device characterized by determining
According to this, by outputting different thicknesses of the cement space according to the conus angle of the abutment tooth, etc., based on the image of the abutment tooth, etc., it is possible to ensure good attachment and prevent the prosthesis from lifting during attachment. It is possible to provide a prosthesis-manufacturing assisting apparatus that assists in the manufacture of a dental prosthesis that prevents the detachment of the prosthesis by providing an appropriate retaining force.

In order to solve the above problems, there is provided a program for causing a computer to execute an information processing method for supporting manufacturing of a dental prosthesis to be placed over an abutment tooth or an inner crown, wherein the abutment tooth or the inner crown is imaged. Measure the conus angle of the abutment tooth or inner crown based on the image obtained, determine the thickness of the cement space between the abutment tooth or inner crown and the dental prosthesis based on the measured conus angle, and determine the cement space A program for causing a computer to execute an information processing method, wherein the measurement of the conus angle of the abutment tooth or the inner crown is performed by measuring the third conus at an arbitrary position of the abutment tooth or the inner crown and a fourth conus angle at a position substantially orthogonal to the position where the third conus angle was measured, and determining the cement space from the average of the third conus angle and the fourth conus angle. A program is provided.
According to this, by outputting different thicknesses of the cement space according to the conus angle of the abutment tooth, etc., based on the image of the abutment tooth, etc., it is possible to ensure good attachment and prevent the prosthesis from lifting during attachment. It is possible to provide a program for causing a computer to execute an information processing method that prevents and assists in manufacturing a dental prosthesis that has an appropriate retention force to prevent disengagement of the prosthesis.

INDUSTRIAL APPLICABILITY As described above, according to the present invention, there is provided a dental prosthesis that secures good mountability by a dentist, prevents the prosthesis from lifting during mounting, and provides an appropriate retention force to prevent the prosthesis from coming off. A prosthesis, a manufacturing method thereof, a prosthesis manufacturing support device, and a program can be provided.

FIG. 4 is a side view for explaining the measurement of the taper angle based on the gypsum model of the abutment tooth; FIG. 4 is a schematic diagram for explaining the cone angle (taper angle) of the abutment tooth. FIG. 2 is a schematic diagram for explaining the cement space of the dental prosthesis in the first embodiment according to the present invention; 4 is a flow chart showing a method for manufacturing a dental prosthesis according to the first embodiment of the present invention; 4 is a table showing the cement space according to the conus angle of the dental prosthesis in the first embodiment of the present invention; FIG. 4 is a block diagram of a prosthesis manufacturing support device in a second embodiment according to the present invention; The figure which shows the example of the display screen of the output display part of the prosthesis manufacturing assistance apparatus in 2nd Example which concerns on this invention.

Hereinafter, each embodiment according to the present invention will be described with reference to the drawings.

<First embodiment>
A dental prosthesis 1 according to this embodiment will be described with reference to FIGS. 1 to 5. FIG. The prosthesis 1 is placed directly on an abutment tooth formed to attach the prosthesis 1, or on an implant (artificial tooth root) embedded in a bone such as a tooth root or jaw, or an inner crown attached to the abutment tooth. It is an artificial object used for dental treatment. The abutment tooth or inner crown is usually formed to form a closed cone in the direction of the occlusal plane and is formed to fit the outer crown provided inside the prosthesis 1 .

As shown in the gypsum model of the abutment tooth in FIG. 1, the prosthesis 1 is appropriately selected by the dentist, considering the condition and position of the tooth to be treated, the mounting direction of the prosthesis 1 to the tooth, and the like. It is formed. In the gypsum model of the abutment tooth shown in FIG. 1(A), the cone angle formed by extending the taper of the axial surface is approximately 39.4°, that is, the conus angle is 19.7°. The gypsum model of the abutment tooth shown in FIG. 1(B) is formed with a cone angle of about 18° and a conus angle of 9°. In this way, the shape of the abutment tooth or inner crown is formed considering the shape of the original tooth, the degree of treatment, its position (median side or posterior tooth side), and the mounting direction. The shapes of the abutment teeth and inner crowns are different one by one.

The cone angle (conus angle) of the abutment tooth and inner crown may be measured by any method, and is not particularly limited. Measurement may be performed by applying a goniometer to a gypsum model prepared based on the obtained impression, or may be measured from an auxiliary line drawn on a photographed image of the gypsum model. may be measured by an application that measures the angle based on the captured image. Moreover, it is preferable to measure the cone angle (conus angle) at two or more points. For example, the conus angle (first conus angle) on the buccal side and the tongue side is measured, and the conus angle (second conus angle) at a position (axial plane) perpendicular to the position (axial plane) where the conus angle is measured is measured. Measure. Then, it is preferable to determine a cement space, which will be described later, based on these conus angles.

The cone angle and conus angle of the abutment tooth 2 will be described with reference to FIG. The abutment tooth 2 is formed to protrude from the gum GM in the shape of a truncated cone. The abutment tooth 2 shown in this drawing is schematically expressed as a straight line for the generatrix of the axial surface for simplification. The cone angle of the abutment tooth 2 is obtained based on the taper angle of the axial surface at the margin (the boundary portion between the abutment tooth 2 and the prosthesis 1) when the generatrix is straight. When the generatrix is not straight but has a curvature and the side surface is rounded, the cone angle of the abutment tooth 2 can be an angle obtained by averaging the taper angle of the axial surface at the margin and the taper angle near the top. .

Also, if the generatrix is not a straight line but is bent once in the middle and the side surface is composed of two surfaces, the cone angle of the abutment tooth 2 is the length of the longer generatrix of the two straight generatrixes. The taper angle may be the cone angle of the abutment tooth 2, or if the generatrix of the two straight lines has approximately the same length, the average of the taper angles of the two generatrices is the cone angle of the abutment tooth 2. It can be a corner. The cone angle Aa of the abutment tooth 2 shown in this figure (A) is larger than the cone angle Ab of the abutment tooth 2 shown in this figure (B). Therefore, the conus angle Aa/2 of the abutment tooth 2 shown in this figure (A) is larger than the conus angle Ab/2 of the abutment tooth 2 shown in this figure (B).

3, the prosthesis 1 and the cement space 3 corresponding to the abutment tooth 2 shown in FIGS. 2(A) and 2(B) will be described. As shown in FIG. 3 , the inner side (corresponding to the outer crown) of the prosthesis 1 is formed to match the shape of the abutment tooth 2 and fit the abutment tooth 2 . On the inside of the prosthesis 1 fitted to the side of the abutment tooth 2 the cone angle formed from its axial plane is the same as the cone angle of the abutment tooth 2 . That is, the inner cone angle of the prosthesis 1 in FIG. 3(A) is equal to the cone angle Aa of the abutment tooth 2 in this figure. Also, the inner taper angle of the prosthesis 1 in FIG. 3(B) is equal to the cone angle Ab of the abutment tooth 2 in this figure.

Therefore, a cement space 3 having approximately the same thickness is ensured between the side surface of the abutment tooth 2 and the inner side surface of the prosthesis 1 that conforms to the side surface. Here, the cement space 3 refers to a gap secured between the abutment tooth 2 and the inner side of the prosthesis 1 in order to apply the cement used to fix the prosthesis 1 to the abutment tooth 2. . Even if the generatrix is curved/bent, a cement space 3 having approximately the same thickness can be secured between the side surface of the abutment tooth 2 and the inner side surface of the prosthesis 1 corresponding to the side surface. preferable.

As shown in FIG. 3(A), the abutment tooth 2 having a relatively large cone angle Aa and the prosthesis 1 are formed inside the prosthesis 1 so as to secure a cement space 3 with a predetermined thickness Wa. It is Further, as shown in FIG. 3B, the abutment tooth 2 having a relatively small cone angle Ab and the prosthesis 1 are arranged inside the prosthesis 1 so as to secure a cement space 3 with a predetermined thickness Wb. is formed. Here, the relationship of Wa<Wb is established. That is, the thickness Wa of the cement space 3 of the abutment tooth 2 and the prosthesis 1 having a relatively large conus angle Aa/2 is equal to the thickness Wa of the cement space 3 of the abutment tooth 2 and the prosthesis 1 having a relatively small conus angle Ab/2. It is thinner than the thickness Wb of the space 3 . That is, the thickness Wa of the cement space 3 of the first conus angle (Aa) is thinner than the thickness Wb of the cement space 3 of the second conus angle (Ab<Aa) smaller than the first conus angle (Wa<Wb).

More specifically, as shown in FIG. 5, as a result of many experiments conducted by the inventor, for example, when the conus angle is 19° or more, the cement space is 0 μm, and when the conus angle is 10° or more and less than 12° It has been found that a cement space of 20 μm is preferable for , and a cement space of 45 μm is preferable when the conus angle is less than 5°. The thickness of the cement space at the top of the truncated cone is not particularly limited, but since it is usually preferable to apply the same thickness of cement, it is recommended that the thickness be the same as the thickness of the cement space at the tapered axial surface. preferable.

The abutment tooth 2 is usually formed by a dentist, but the prosthesis 1 is usually formed to fit the abutment tooth 2 by a dental technician. Also, the attachment of the prosthesis 1 to the abutment tooth 2 is usually performed by a dentist. If the fitting of the prosthesis 1 made by the dental technician to the abutment tooth 2 is loose, the prosthesis 1 is likely to separate from the abutment tooth 2 during the mounting operation by the dentist. occurs. However, since the thickness Wa of the cement space 3 in the abutment tooth 2 having a large conus angle is thinner than the thickness Wb of the cement space 3 in the abutment tooth 2 having a small conus angle, both separation prevention and lifting prevention are achieved. It is possible to provide a dental prosthesis 1 that combines Although the abutment tooth 2 has been described above as an example, the same applies to a tooth root (including an artificial tooth root) or an inner crown attached to the abutment tooth.

Thus, by providing the dental prosthesis 1 in which the thickness of the cement space 3 between the abutment tooth 2 and the prosthesis 1 differs according to the conus angle of the abutment tooth 2 etc., the dentist can It is possible to secure good attachability by securing the prosthesis 1 and prevent the prosthesis 1 from lifting up at the time of attachment, and to prevent the prosthesis 1 from being detached by providing an appropriate retaining force. When the cornus angle is relatively small, it is easier to attach the prosthesis 1 to the abutment tooth 2 if there is a certain amount of loose cement space, so it is preferable to make the cement space thicker. Conversely, when the conus angle is relatively large, it is easy to attach the prosthesis 1 to the abutment tooth 2, so a thick cement space is not required, and a gap between the abutment tooth 2 and the like and the prosthesis 1 is large. It is preferable to mount while preventing detachment by exhibiting a retaining force resulting from the fact that the shape is small and substantially matched.

A method for manufacturing the prosthesis 1 will be described with reference to FIG. Note that S in the flow chart means a step. In S100, the conus angle (third conus angle) formed from the buccal axial surface and the lingual axial surface of the abutment tooth 2 is measured. As described above, the measurement method is not particularly limited, and for example, measurement may be performed using a goniometer based on the gypsum model of the abutment tooth 2 . In S102, a conus angle (fourth conus angle) formed from an axial plane perpendicular to the axial plane on which the third conus angle was measured (an axial plane perpendicular to the dentition direction) is measured. For example, in the case of the abutment tooth of a back tooth, the fourth conus angle is the conus angle formed by the mesial side axial surface and the distal side axial surface of the abutment tooth 2 .

In S104, the average of the third conus angle and the fourth conus angle is calculated. In S106, the thickness of the cement space 3 between the abutment tooth 2 and the prosthesis 1 is determined based on the average cornus angle and the cornus angle cement space correspondence table 50 shown in FIG. In this way, the third conus angle at an arbitrary position and the fourth conus angle at a position substantially perpendicular to the position at which the third conus angle was measured are measured, and the relationship between the third conus angle and the fourth conus angle It is preferred to determine the cement space 3 from the average. According to this method, by determining the cement space from the average of two conus angles, a method for manufacturing a dental prosthesis 1 that prevents both detachment and lifting over the entire circumference of the side surface of the abutment tooth or the like. can be provided. Note that conus angles at three or more locations may be measured, and determination may be made based on the average or median value of these conus angles.

In this way, by determining the thickness of the cement space between the abutment tooth 2 and the like and the prosthesis 1 based on the measured conus angle, it is possible to ensure good mountability by the dentist, and the prosthesis 1 at the time of mounting. It is possible to provide a method for manufacturing a dental prosthesis 1 that prevents the prosthesis 1 from rising and provides an appropriate retaining force to prevent the prosthesis 1 from coming off.

<Second embodiment>
A dental prosthesis manufacturing support apparatus 100 according to the present embodiment will be described with reference to FIGS. 6 and 7. FIG. In order to avoid duplication of description, the same components are given the same reference numerals, and the description thereof is omitted. The prosthesis manufacturing support device 100 is a device that supports manufacturing of the dental prosthesis 1 to be put on the abutment tooth or the inner crown. The prosthesis manufacturing support apparatus 100 includes a captured image acquisition unit 10 that acquires an image of the abutment tooth or the inner crown, and a conus angle measurement unit that measures the conus angle of the abutment tooth or the like captured in the acquired image. 20, a cement space determination unit 30 that determines the thickness of the cement space between the abutment tooth or the like and the prosthesis 1 based on the measured conus angle, and an output processing unit 40 that outputs the determined thickness of the cement space. are provided in the processing unit Prc.

The prosthesis manufacturing assisting apparatus 100 further includes a conus angle cement space correspondence table 50 and an image storage section 60 for storing acquired images in the storage section Mem. In addition, the prosthesis manufacturing support apparatus 100 further includes an imaging unit Cam that images the abutment tooth or the inner crown, a communication unit Com that acquires images from other devices or the like via a network, and a target from the acquired images. and an output display unit Dsp for outputting the thickness of the cement space output by the output processing unit 40 .

A captured image acquisition unit 10 acquires an image showing the abutment tooth 2 and the like for which the conus angle is to be measured in order to determine the cement space with the prosthesis 1 . The captured image acquisition unit 10 acquires an image specified for measuring the conus angle by the operation input unit Opr from the images stored in the image storage unit 60 . The image stored in the image storage unit 60 may be an image of the abutment tooth 2 or the like captured by the imaging unit Cam provided in the prosthesis manufacturing support apparatus 100, or may be an image captured by the communication unit from another device. It may be an image obtained via Com. Here, the images stored in the image storage unit 60 are an image showing the buccal axial surface and the lingual axial surface of the abutment tooth 2, and an axial surface orthogonal to the buccolingual axial surface. It is assumed that the images are stored in pairs.

The conus angle measuring unit 20 measures the conus angle based on the abutment tooth 2 and the like appearing in the acquired image. The method of measuring the conus angle in the conus angle measuring unit 20 is as follows. First, as shown in FIG. , the taper angle of the left axial surface of the abutment tooth) is measured, and then the taper angle of the other axial surface of the abutment tooth 2 (the right axial surface of the abutment tooth in this figure) is measured. . Then, the cone angle of the abutment tooth 2 can be calculated from the taper angle on one side and the taper angle on the other side (for example, the cone angle of the abutment tooth in this figure is 39.440°). Assuming that this figure is an image showing the buccolingual axial surface of the abutment tooth 2, using FIG. Calculate the angle (the abutment cone angle in this figure is 17.992°). In addition, since the generatrix of the side face of the abutment tooth 2 in this figure is almost straight, the taper angle of the axial face at the margin is used only for the calculation. Since the conus angle of this abutment tooth 2 is half of the average cone angle of both, it is calculated as (39.440°+17.992°)/4=14.358°. In the case of an artificial inner crown, the cone angle is often the same regardless of where it is measured, so the conus angle may be obtained based on one cone angle.

The cement space determination unit 30 refers to the conus angle cement space correspondence table 50 stored in the storage unit Mem, and determines the thickness of the cement space between the abutment tooth 2 etc. and the prosthesis 1 corresponding to the measured conus angle. (in this figure the cement spacing is 15 μm).

The output processing unit 40 outputs at least the cement space thickness determined by the cement space determination unit 30 . FIG. 7 shows a display screen output by the output processing unit 40 to the output display unit Dsp that can be viewed by the user. The output processing unit 40 generates an image of the abutment tooth 2 to be measured (image showing the buccolingual direction and the axial plane in the direction perpendicular to the direction), two cone angles measured from the image, and their The average conus angle calculated from the cone angle and the thickness of the cement space based on the conus angle are output to the output display unit Dsp. display to the person. Note that the output processing unit 40 may output the thickness of the cement space as data to another device via the communication unit Com.

In this way, based on the image of the abutment tooth, etc., by outputting different thicknesses of the cement space according to the conus angle of the abutment tooth, etc., it is possible to ensure good attachment and prevent the prosthesis from lifting during attachment. It is possible to provide a prosthesis manufacturing assisting apparatus 100 that assists in manufacturing a dental prosthesis that prevents detachment of the prosthesis and provides appropriate retention force to prevent detachment of the prosthesis.

As shown in FIG. 6, the prosthesis manufacturing assisting apparatus 100 includes a processing unit Prc, which includes a CPU (Central Processing Unit) and an MPU (Micro Processing Unit), a ROM (Read Only Memory), a RAM (Random Access Memory), and the like. a storage unit Mem such as a memory device, a communication unit Com of a network interface connected to the Internet or a LAN (Local Area Network), an operation input unit Opr such as a touch panel, an output display unit Dsp such as a display for displaying information, etc. and these are connected to each other via a transmission line such as an internal bus.

The processing unit Prc has a processor such as a CPU capable of executing programs and its peripheral circuits. The processing unit Prc performs arithmetic processing for executing the functions of the captured image acquisition unit 10, the cornus angle measurement unit 20, the cement space determination unit 30, and the output processing unit 40, and supports prosthesis manufacturing. It has a control unit Ctl that controls the overall operation of the device 100, and transmits and receives control signals and information signals (data) to and from the other components described above.

In the ROM of the storage unit Mem, generally, an IPL (Initial Program Loader) that is executed first after power-on is recorded. Ctl once writes these to a RAM for temporarily storing them, and those programs are executed by the control unit Ctl. The programs stored in the storage unit Mem are operating system programs and various application programs (including programs for the prosthesis manufacturing support apparatus 100).

A program for the prosthesis manufacturing support apparatus 100 is usually downloaded from the outside via the communication unit Com and installed in the prosthesis manufacturing support apparatus 100 . The installed program for the prosthesis manufacturing support apparatus 100 is started by the user using the operation input unit Opr. When activated, the control unit Ctl is configured to execute the processing of the program for the prosthesis manufacturing support apparatus 100 and perform various arithmetic processing necessary for control. The functions performed by the measurement unit 20, the cement space determination unit 30, and the output processing unit 40 are executed/controlled as part of the functions of the processing unit Prc. As described above, when the user requests the prosthesis manufacturing support apparatus 100 to output the thickness of the cement space of the target abutment tooth or the like via the operation input section Opr, the output display section Display cement space thickness via Dsp.

It can also be provided as a program for a computer to execute as an information processing method that functions as the prosthesis manufacturing support apparatus 100 . That is, it is a program for causing a computer to execute an information processing method for supporting the manufacture of a dental prosthesis to be attached to an abutment tooth or an inner crown, and Measure the conus angle of the tooth, determine the thickness of the cement space between the abutment tooth and the prosthesis based on the measured conus angle, and cause the computer to execute the information processing method of outputting the determined thickness of the cement space provide a program for

In this way, based on the image of the abutment tooth, etc., by outputting different thicknesses of the cement space according to the conus angle of the abutment tooth, etc., it is possible to ensure good attachment and prevent the prosthesis from lifting during attachment. It is possible to provide a program for causing a computer to execute an information processing method that prevents and assists in manufacturing a dental prosthesis that has an appropriate retention force to prevent disengagement of the prosthesis.

This program is a program for the prosthesis manufacturing support apparatus 100, is installed in the prosthesis manufacturing support apparatus 100, and is started by the user using the operation input unit Opr. When this program is started, it is executed as functions performed by the captured image acquisition unit 10, the conus angle measurement unit 20, the cement space determination unit 30, and the output processing unit 40. FIG.

It should be noted that the present invention is not limited to the exemplified embodiments, and can be implemented with a configuration that does not deviate from the content described in each item of the claims. That is, although the present invention has been particularly illustrated and described primarily with respect to particular embodiments, there may be modifications, quantities, Various modifications can be made to other detailed configurations by those skilled in the art.

1 dental prosthesis 2 abutment tooth (inner crown)
3 Cement space Aa, Ab Conical angle (taper angle)
Wa, Wb Cement space thickness GM Gums 100 Prosthesis manufacturing support device 10 Captured image acquisition unit 20 Conus angle measurement unit 30 Cement space determination unit 40 Output processing unit 50 Conus angle cement space correspondence table 60 Image storage unit Prc Processing unit Mem Memory unit Com Communication unit Cam Imaging unit Opr Operation input unit Dsp Output display unit

Claims (3)

A method for manufacturing a dental prosthesis to be placed over an abutment tooth or an inner crown,
measuring the conus angle of the abutment tooth or the inner crown;
A method for manufacturing a dental prosthesis, wherein the thickness of the cement space between the abutment tooth or the inner crown and the dental prosthesis is determined based on the measured conus angle,
The conus angle of the abutment tooth or the inner crown is measured at a third conus angle at an arbitrary position of the abutment tooth or the inner crown, and at a position substantially orthogonal to the position at which the third conus angle is measured. Measure the fourth conus angle of
determining a cement space from the average of the third conus angle and the fourth conus angle;
A method for manufacturing a dental prosthesis, characterized by: A prosthesis manufacturing assisting device for assisting manufacturing of a dental prosthesis to be put on an abutment tooth or an inner crown,
a captured image acquisition unit that acquires an image of the abutment tooth or the inner crown;
a conus angle measuring unit that measures the conus angle of the abutment tooth or the inner crown imaged in the image;
a cement space determination unit that determines the thickness of the cement space between the abutment tooth or the inner crown and the dental prosthesis based on the measured conus angle;
an output processing unit that outputs the determined thickness of the cement space;
with
The conus angle measuring unit measures a third conus angle at an arbitrary position on the abutment tooth or the inner crown and a fourth conus angle at a position substantially orthogonal to the position at which the third conus angle is measured. death,
The cement space determination unit determines the cement space from an average of the third conus angle and the fourth conus angle.
A prosthesis manufacturing support device characterized by : A program for causing a computer to execute an information processing method for supporting the manufacture of a dental prosthesis to be placed over an abutment tooth or an inner crown,
measuring the conus angle of the abutment tooth or the inner crown based on the captured image of the abutment tooth or the inner crown;
determining the thickness of the cement space between the abutment tooth or the inner crown and the dental prosthesis based on the measured conus angle;
Output the determined cement space thickness,
A program for causing a computer to execute an information processing method ,
The conus angle of the abutment tooth or the inner crown is measured at a third conus angle at an arbitrary position of the abutment tooth or the inner crown, and at a position substantially orthogonal to the position at which the third conus angle is measured. Measure the fourth conus angle of
determining a cement space from the average of the third conus angle and the fourth conus angle;
A program characterized by

Images