KR20220081176A - A device and method for providing a virtual articulator - Google Patents

Abstract

According to an embodiment, the movement path of the condyle is obtained by acquiring condylar movement data representing the movement of the condyle included in the object using dynamic data on the 3D modeling image, and simulating the movement of the object based on the condylar movement data. Disclosed are a method and a device capable of providing a virtual articulator that can be reproduced as it is.

Description

DEVICE AND METHOD FOR PROVIDING A VIRTUAL ARTICULATOR

The present disclosure relates to devices and methods for providing a virtual articulator. Specifically, the present disclosure relates to a device and method capable of providing a virtual articulator that simulates the movement of an object based on the movement of the condyle.

The conventional technique for designing a dental crown requires setting of a virtual articulator in the process, and it is possible to adjust the occlusion of the prosthesis to be restored in advance through the virtual articulator and reduce the treatment time in the setting process in the patient's mouth.

However, in the conventional virtual articulator technology, the semi-adjustable articulator used by the technician is made into a library as a virtual articulator, registered, and then adjusted by inputting arbitrary data. Therefore, since the prior art does not use patient information, there is a problem in that an error occurs in the virtual articulator, and it is difficult to check specific information such as the strength (strength) of the occlusion because only the point where the occlusion touches can be confirmed. . Accordingly, in the prior art, it is difficult to match the uniform occlusal strength (strength) of the prosthesis in the process of designing and adjusting the occlusion of the prosthesis (especially the bridge case). There is this.

Accordingly, there is a need for a technology for solving the above-described problems and providing a virtual articulator suitable for a patient.

The present disclosure may provide devices and methods for providing a virtual articulator. Specifically, a device and method capable of providing a virtual articulator that simulates a movement of an object based on movement of a condyle are disclosed. The technical problem to be solved is not limited to the technical problems as described above, and various technical problems may be further included within the scope obvious to those skilled in the art.

A method of providing a virtual articulator according to a first aspect of the present disclosure includes: acquiring a 3D modeling image by matching CT data and scan data of an object; acquiring dynamic data for the 3D modeling image; obtaining condylar movement data representing movement of a condyle included in the object by using the dynamic data; and providing a virtual articulator that simulates the movement of the object based on the 3D modeling image and the condylar movement data.

In addition, the condylar movement data may include data indicating a movement path of the condyle when the object performs the forward motion and the lateral motion within a limit motion range.

Also, the condylar movement data may include a Condylar angle obtained when the forward motion of the object is performed within a limit motion range.

Also, the condylar movement data may include a Bennet angle obtained when the lateral movement of the object is performed within a limit movement range.

In addition, the 3D modeling image may include an anterior virtual tooth, and the size or position of the anterior virtual tooth may be determined such that a distance between the maxilla and the mandible in the occlusion state is included within a preset value range.

In addition, the 3D modeling image may include the posterior virtual teeth, and the size or position of the posterior virtual teeth may be determined such that the maxilla and the mandible contact each other in an occlusal state.

Also, the magnitude of the force applied when the posterior virtual teeth abut against each other in the occlusal state may correspond to the magnitude of the force applied when the posterior virtual teeth abut with each other in the occlusal state.

Also, a mutual contact area when the posterior virtual teeth abut against each other in an occlusal state may correspond to a mutual contact area when the posterior real teeth abut with each other in an occlusal state.

In addition, the method includes determining the situation for the posterior virtual tooth as one of canine guidance and a group function; and determining the size or position of the posterior virtual tooth based on the determined situation for the posterior virtual tooth.

A device for providing a virtual articulator according to the second aspect of the present disclosure obtains a 3D modeling image by matching CT data and scan data of an object, obtains dynamic data for the 3D modeling image, and uses the dynamic data a processor for obtaining condylar movement data representing movement of the condyle included in the object and providing a virtual articulator that simulates movement of the object based on the 3D modeling image and the condylar movement data; and a memory for storing the CT data and the scan data.

The device, wherein the condylar movement data includes data indicating a movement path of the condyle when the object performs an anterior movement and a lateral movement within a limit movement range.

Also, the condylar movement data may include a Condylar angle obtained when the forward motion of the object is performed within a limit motion range.

Also, the condylar movement data may include a Bennet angle obtained when the lateral movement of the object is performed within a limit movement range.

In addition, the 3D modeling image may include an anterior virtual tooth, and the size or position of the anterior virtual tooth may be determined such that a distance between the maxilla and the mandible in the occlusion state is included within a preset value range.

In addition, the 3D modeling image may include the posterior virtual teeth, and the size or position of the posterior virtual teeth may be determined such that the maxilla and the mandible contact each other in an occlusal state.

A third aspect of the present disclosure may provide a computer-readable recording medium recording a program for executing the method according to the first aspect on a computer. Alternatively, the fourth aspect of the present disclosure may provide a computer program stored in a recording medium to implement the method according to the first aspect.

According to an embodiment, it is possible to provide a virtual articulator capable of reproducing the movement path of the condyle as it is by using information when the teeth are in an occlusal state and when the teeth are in a limiting motion state.

In addition, in the prior art, a virtual articulator was implemented by correcting a specific numerical value. However, according to an embodiment of the present invention, it is possible to provide a virtual articulator that reproduces the movement path of the condyle as it is by reflecting even a change in movement during minute movement. can

In addition, it is possible to precisely 3D model the virtual teeth by placing and correcting the virtual teeth on the 3D modeling image based on the virtual articulator that reproduces the movement path of the condyle.

The effect of the present disclosure is not limited to the above effect, but it should be understood to include all effects inferred from the configuration of the invention described in the detailed description or claims of the present disclosure.

1 is a schematic diagram illustrating an example of a configuration of a device according to an embodiment.
2 is a flowchart illustrating a method for a device to provide a virtual articulator according to an embodiment.
3 is a diagram for describing an operation in which a device acquires CT data and scan data, according to an exemplary embodiment.
4 and 5 are diagrams for explaining an operation in which a device acquires static data and dynamic data on an object, respectively, according to an exemplary embodiment.
6 to 8 are diagrams for explaining an operation in which a device uses dynamic data to update a 3D modeling image in which CT data and scan data are matched, according to an exemplary embodiment.
9 to 15 are diagrams for explaining an operation in which a device acquires condylar movement data from a 3D modeling image and based on dynamic data, according to an exemplary embodiment.
16 to 17 respectively show a display screen on the working side and a display screen on the balance side provided to the user during leftward movement.
18 shows a display screen provided to a user during a forward movement.
19 to 20 are diagrams for explaining an operation in which the device provides information on the distance between the maxilla and the mandible in an occlusal state based on a simulation result through a virtual articulator, according to an embodiment.
21 to 22 are diagrams for explaining an operation in which a device determines an anterior virtual tooth based on a virtual articulator, according to an exemplary embodiment.
23 to 24 are diagrams for explaining an operation of determining, by a device, a virtual posterior tooth based on a virtual articulator, according to an exemplary embodiment.
25 is a diagram for explaining an operation in which a device determines a situation for a posterior virtual tooth as one of K-Nine guidance and a group function, according to an embodiment.
26 is a flowchart illustrating an example of a method for a device to provide a virtual articulator according to an embodiment.

Terms used in the embodiments are selected as currently widely used general terms as possible while considering functions in the present disclosure, but may vary according to intentions or precedents of those of ordinary skill in the art, emergence of new technologies, and the like. In addition, in a specific case, there is a term arbitrarily selected by the applicant, and in this case, the meaning will be described in detail in the description of the corresponding invention. Therefore, the terms used in the present disclosure should be defined based on the meaning of the term and the contents of the present disclosure, rather than the simple name of the term.

In the entire specification, when a part “includes” a certain element, it means that other elements may be further included, rather than excluding other elements, unless otherwise stated. In addition, the “… wealth", "… The term “module” means a unit that processes at least one function or operation, which may be implemented as hardware or software, or a combination of hardware and software.

Hereinafter, embodiments of the present disclosure will be described in detail with reference to the accompanying drawings so that those of ordinary skill in the art to which the present disclosure pertains can easily implement them. However, the present disclosure may be implemented in several different forms and is not limited to the embodiments described herein.

Hereinafter, embodiments of the present disclosure will be described in detail with reference to the drawings.

1 is a schematic diagram illustrating an example of a configuration of a device 100 according to an embodiment, and FIG. 2 is a flowchart illustrating a method of providing a virtual articulator by the device 100 according to an embodiment.

1 to 2 , a device 100 according to an embodiment may include a processor 110 and a memory 120 .

In operation S210, the processor 110 may obtain a 3D modeling image by matching the CT data and the scan data of the object. For example, the processor 110 may acquire CT data and scan data of the oral cavity of an object (eg, a patient) through photographing, scanning, memory, or a communication device, and according to a pre-stored registration algorithm, CT data and A 3D modeling image may be generated by matching the other one of the scan data based on one preset one.

In an embodiment, the CT data may include multidimensional image data taken to analyze the oral cavity of a subject (eg, a patient) (refer to FIG. 3A ), for example, 3D computed tomography (CT). ) image, but is not limited thereto, and may include various types of medical images such as, for example, DICOM (Digital Imaging and Communications in Medicine) digital images, and after obtaining a medical image of a patient The oral part may be used. As such, the technical scope of the present disclosure is not limited to a specific type of medical image.

In an embodiment, the scan data includes 3D stereoscopic information about the oral cavity of the object (eg, a patient) (see FIG. 3( b )), and for example, the maxilla and the mandible in a digital scanning method using an oral scanner. It may be oral scan data acquired for can be (eg surface data).

In an embodiment, the 3D modeling image may include 3D modeling data for the oral cavity of an object (eg, a patient) obtained according to the registration of CT data and scan data, and a specific view (eg, Axial View, It can be understood as a concept encompassing one or more cross-sectional images that are extracted or processed based on Cross View, Coronal View, etc.).

In an embodiment, the processor 110 may match the CT data and the scan data based on a resin marker obtained from each of the CT data and the scan data, for example, by analyzing the CT data and the scan data, respectively. A plurality of (eg, 3) resin markers are created based on a reference tooth (eg, right corner region, anterior and both molars, etc.) or a resin marker is created through user input, and coordinate information is mutually Different CT data and scan data can be matched.

In step S220, the processor 110 may acquire dynamic data for the 3D modeling image. This will be described with further reference to FIGS. 4 and 5 .

4 and 5 are diagrams for explaining an operation in which the device 100 acquires static data and dynamic data of an object, respectively, according to an exemplary embodiment.

Referring to FIG. 4 , the processor 110 may acquire static data about the object, and for example, scan the oral cavity of the object (eg, patient) in a static occlusion state or process the patient's teeth by imitation of the patient's teeth. Static data can be obtained by photographing the occlusal state of artificial tooth structures (eg, artificial maxilla, artificial mandible).

In an embodiment, the static data represents static occlusion data, and for example, may include data recording a static occlusion state in which the maxillary and mandibular teeth are in contact with the patient's mouth closed.

Referring to FIG. 5 , the processor 110 may acquire dynamic data on the object, and for example, the intraoral movement of the object (eg, a patient) using at least one of a photographing method and a video recording method. Dynamic data can be obtained by photographing.

In an embodiment, the dynamic data represents dynamic occlusal data, and based on the occlusal state, a forward movement (refer to FIG. 5(a) ) and a leftward movement (refer to FIG. 5(b) for an oral cavity of a subject (eg, a patient)) ) and rightward movement (see Fig. 5(c)), for example, when the patient moves forward, leftward, and rightward, respectively, the maxillary and mandibular teeth do not come into contact with each other. It may include data recording the moment. In an embodiment, each of the forward movement, the left movement, and the right movement may be performed within the range of the limit movement.

In operation S230 , the processor 110 may obtain condylar movement data indicating movement of the condyle included in the object by using the dynamic data. In an embodiment, the condylar movement data may include data indicating a movement path of the condyle when the object performs an anterior movement and a lateral movement within a limit movement range.

Hereinafter, various embodiments of step S230 will be described in more detail with reference to FIGS. 6 to 15 .

6 to 8 are diagrams for explaining an operation in which the device 100 updates a 3D modeling image in which CT data and scan data are matched using dynamic data, according to an exemplary embodiment.

6 to 8, the processor 110 updates the 3D modeling image by matching the dynamic data to the 3D modeling image to which the CT data and the scan data are matched, and analyzes the movement of the condyle in the updated 3D modeling image. Condylar movement data may be obtained. For example, the processor 110 uses a specific number (eg, three) of points (eg, anterior teeth, both molars) (eg, anterior teeth, both molars) set by the user based on the teeth (see identification number 610), dynamic data of forward movement (see Fig. 6(b)) is registered to the 3D modeling image (see Fig. 6(a)), and the dynamic data of the left movement (see Fig. 7(b)) is registered to the 3D modeling image (Fig. 7(a)) refer), by registering the dynamic data of the right movement (refer to FIG. 8(b)) to the 3D modeling image (refer to FIG. 8(a)), it is possible to complete the registration of the 3D modeling image and the dynamic data.

9 to 15 are diagrams for explaining an operation in which the device 100 acquires condylar movement data from a 3D modeling image and based on dynamic data, according to an exemplary embodiment.

Referring to FIG. 9 , the processor 110 is based on the medial pole 910 of the mandible, the lateral pole 920 of the mandible and the uppermost 930 of the mandible in the 3D modeling image. Thus, the condylar movement data can be obtained by determining the central position 940 of the condyle indicating a reference point for acquiring the movement path of the condyle, and analyzing the movement of the condyle based on the determined central position 940 of the condyle. For example, by analyzing the 3D modeling image of Coronal View to detect an inflection point on the mandible, the medial bone 910 of the mandible, the lateral bone 920 of the mandible, and the uppermost part 930 of the mandible are extracted, and the mandible A first straight line connecting the medial bone 910 of the head and the lateral bone 920 of the mandibular head horizontally and a second straight line extending vertically from the uppermost part 930 of the mandible are determined, and the first straight line and the second straight line are determined. The point where the straight lines meet may be determined as the central position 940 of the condyle, and the medial bone 910 of the mandible, the lateral bone 920 of the mandible, and the uppermost portion 930 of the mandible may all be determined as reference points. have.

Referring to FIG. 10 , the condylar movement data may include a Condylar angle 1030 obtained when the forward motion of the object is performed within a limit motion range. In FIG. 10 , a first reference plane 1010 may be set by a user as a reference plane for measuring an angle (eg, FH Plane), and the second reference plane 1020 is a reference plane determined according to motion analysis of the condyle, and the forward motion It may be obtained by connecting the first point 940a which is the central position 940 of the anterior condyle and the second point 940b which is the central position 940 of the condyle after the anterior movement. In addition, the condylar angle 1030 represents the limit angle at which the condyle can move during the forward movement of the object, for example, the first reference plane 1010 and the second reference plane ( 1020) may be a slope between In addition, the condylar path 1040 indicates the distance the center of the condyle moves during the forward movement of the object, and for example, at the first point 940a, which is the center of the condyle in the occlusal state, is the center of the condyle during the forward limiting motion. It may be a trajectory moved to the second point 940b.

In an embodiment, the processor 110 performs a forward motion based on the first point 940a, which is the center of the condyle in a static state of an object (eg, a patient) displayed on the 3D modeling image, the condyle at the limiting motion point. Based on the line connecting the second point 940b, which is the center of , the condylor angle 1030 and the condylor path 1040 during the forward movement may be obtained, and specific examples thereof are as follows.

First, referring to FIG. 11 , the processor 110 provides a user interface capable of receiving a user's selection input for the upper ear canal 1110 and the lower orbital edge 1120 on the 3D modeling image of Coronal View, and the user's A plane connecting the upper edge 1110 of the external auditory meatus and the lower edge 1120 of the orbit determined according to the selection input may be set as the first reference plane 1010 .

Next, referring to FIG. 12 , the processor 110 detects an inflection point on the 3D modeling image of the Coronal view to determine the uppermost portion 1210 of the mandibular fossa and the lowermost portion 1220 of the articular elevation, or 3D modeling of the Coronal View A user interface capable of receiving a user's selection input for the uppermost part of the mandible 1210 and the lowermost part of the articular elevation 1220 on the image is provided, and the uppermost part of the mandible 1210 and the lowest part of the joint elevation are provided according to the user's selection input. The chamber 1220 may be determined, and a plane connecting the determined uppermost portion 1210 of the mandibular fossa and the lowermost portion 1220 of the joint ridge may be set as the second reference plane 1020 .

Then, the processor 110 may determine the condylor angle 1030 by connecting the first reference plane 1010 and the second reference plane 1020, and accordingly, with respect to the acquired dynamic data of the forward movement, It is possible to reproduce the condyler path 1040 representing the motion path to the extent. However, such a movement path may be limited by the user or the state of the remaining teeth (eg, up to the point where the cut surface of the maxillary anterior part and the cut surface of the mandibular anterior part engage), and in one embodiment, By providing a control point that divides the motion path for each of the plurality of sections (eg, 0.5 mm units) to set, the motion path can be limited according to a user's correction input for the control point.

13 to 15 , the condylar movement data may include a Bennet angle 1310 obtained when a lateral motion of the object is performed within a limit motion range. 13 to 15 , the Bennett angle 1310 represents a limit angle at which the condyle can move during lateral movement of the object, and may be, for example, an angle measured when the patient turns the chin to the side as much as possible. Also, the Bennett path 1320 represents a distance moved by the condyle during the lateral motion of the object.

In one embodiment, the processor 110 is a line connecting the center of the condyle at the limiting motion point during lateral movement based on the center of the condyle in a static state of the object (eg, patient) appearing on the 3D modeling image. Based on the lateral motion, the Bennett angle 1310 and the Bennett path 1320 may be obtained, and a specific embodiment thereof is as follows.

First, the processor 110 may obtain the first reference surface 1010 as a reference surface for measuring the angle, and may use the first reference surface 1010 determined when the condylor angle 1030 is obtained as it is.

Next, the processor 110 acquires a third reference plane 1330 parallel to the first reference plane 1010, and analyzes the movement of the condyle on the opposite side (non-working side) of the movement direction in the third reference plane 1330, The movement distance and angle can be obtained. For example, as shown in FIG. 13 exemplifying the leftward motion, the third reference plane 1330 that is an axial plane cut in parallel with respect to the first reference plane 1010 that is the FH plane is on the opposite side of the progress direction of the leftward motion. It is possible to measure the limit motion distance and angle of the condylar center position 940 located on the right side (refer to identification number 1340) moved according to the leftward motion. As another example, as shown in FIG. 14 illustrating a rightward movement, the left side (identification number) on the opposite side of the proceeding direction of the rightward movement in the third reference plane 1330 cut in parallel with respect to the first reference plane 1010 1410), the central position 940 of the condyle may measure the limit movement distance and angle moved according to the rightward movement. For another example, as shown in FIG. 15 , the fourth reference plane 1510 which is a sagittal plane with the center of the condyle in the third reference plane 1330 which is an axial plane cut in parallel with respect to the first reference plane 1010 which is the FH plane. ) can measure the distance and angle moved.

Accordingly, the processor 110 may reproduce the motion path up to the limit of motion with respect to the acquired dynamic data of the lateral motion. However, the motion path may be limited by the user or the condition of the remaining teeth (e.g., to the point where the maxillary buccal cusp and the mandibular buccal cusp meet, or to the point where the maxillary lingual cusp and the mandibular buccal cusp meet). In an embodiment, the movement path may be limited according to the user's correction input for the control point by providing a control point for the movement path for each preset plurality of sections (eg, in units of 0.5 mm) in the left lateral movement or the right lateral movement. have.

In operation S240 , the processor 110 may provide a virtual articulator that simulates the movement of the object based on the 3D modeling image and the condylar movement data. In an embodiment, the processor 110 may obtain a virtual articulator by applying condylar movement data on a 3D modeling image to which CT data, scan data, and dynamic data are registered, and static movement and dynamic movement through the virtual articulator By simulating the motion (forward and lateral motion), it is possible to reproduce the motion path up to the limit of motion for the forward, left and right motions of the maxilla and mandible.

16 to 17 respectively show a display screen on the working side and a display screen on the balance side provided to the user during leftward movement, and FIG. 18 shows a display screen provided to the user during forward movement. 16 to 18 , the processor 110 may reproduce the movement of the condyle through a virtual articulator and provide an occlusal compass that provides a motion path, occlusal strength, and occlusal area, and a user's selection input (eg, : It is possible to display only the part selected by the user through the user interface that receives the button click).

Accordingly, the processor 110 may acquire a virtual articulator capable of dynamic motion on the 3D modeling image based on the patient data through the above-described steps, and the articulator shape, movement angle and path, etc. are not specified in the articulator, but the patient's It has a special advantage in that it is an articulator shape that can reproduce the movement of the condyle as it is in the shape of the patient's teeth based on CT data and scan data.

After step S240, the processor 110 may determine a virtual tooth superimposed on the 3D modeling image based on the virtual articulator, and in an embodiment, the virtual tooth is superimposed on the 3D modeling image, and a simulation result through the virtual articulator The virtual tooth may be updated based on the . For example, the processor 110 sets a margin indicating the interface between the tooth and the prosthesis based on the inflection point or the curvature of the toothless region on the 3D modeling image, determines the shape of the virtual tooth from the pre-stored library, and the margin And based on the shape, it is possible to prepare a virtual tooth (eg, a virtual crown) to be restored to a tooth-free area on the 3D modeling image. At this time, some different processes may be performed depending on whether the region to be restored virtual teeth corresponds to the anterior part or the posterior part, and the details thereof will be described in more detail with further reference to FIGS. 19 to 25 .

19 to 20 are diagrams for explaining an operation in which the device 100 provides information on the distance between the maxilla and the mandible in an occlusal state based on a simulation result through a virtual articulator, according to an embodiment.

Referring to FIG. 19 , the processor 110 determines whether a virtual tooth to be restored is an anterior or a posterior region, and when there is no virtual tooth on the 3D modeling image, the contact area for each region between the remaining teeth (eg, between the maxilla and the mandible) Alternatively, a result of simulating the contact strength may be displayed. In an embodiment, the contact intensity may be expressed in a contour form in proportion to the distance between the residual values, for example, a contact point between the residual values may be expressed in red. At this time, it is possible to record traces of the collision surface between the residual values (eg, impenetrable), and express them in different colors from the movement in dynamic data (eg, forward, left, right), which is intuitive to the user. screen can be provided.

Referring to FIG. 20 , the processor 110 determines whether a virtual tooth to be restored is an anterior or a posterior region, when there is a virtual tooth on the 3D modeling image, the contact area for each region between the remaining teeth (eg, between the maxilla and the mandible) Alternatively, a result of simulating the contact strength may be displayed. In one embodiment, if there is an opposing tooth for the virtual tooth to be restored or the upper and lower jaws need to be restored at the same time, the penetrating state may be displayed at the time of collision, and the contact area and intensity may be displayed differently, , Also, it is possible to provide a screen that a user can compare more easily by arranging a screen showing a penetrating state when collided with the screen shown in FIG. 20 in one window.

21 to 22 are diagrams for explaining an operation in which the device 100 determines an anterior virtual tooth based on a virtual articulator, according to an exemplary embodiment.

Referring to FIG. 21 , the 3D modeling image may include an anterior virtual tooth, and the size or location of the anterior virtual tooth may be determined such that the distance between the maxilla and the mandible in the occlusal state is included within a preset value range. That is, when the tooth to be restored is the anterior portion, the size and position may be adjusted so that a proper distance is maintained without contacting the antagonist in the occlusal state.

For example, as shown in FIG. 21(a), when there is contact with the anterior virtual tooth, the contact area and intensity for each area of the virtual tooth are set to 0, or the mandible is occluded in a static state (eg, CO state). ), it is possible to provide a display screen to the user by automatically transforming the virtual tooth into a form away from a preset value (eg, 0.5 mm) in the degree of closeness of the contour line that appears.

For another example, as in Fig. 21(b), if there is no contact with the anterior virtual tooth, the distance between the anterior virtual tooth and the antagonist may be large, so the mandible may be occluded in a static state (eg, CO state). When a virtual tooth is formed in a shape separated from a preset value (eg, 0.5 mm), the shape of the virtual tooth may be changed when performing a forward motion during a dynamic motion thereafter.

Referring to FIG. 22 , the size of the virtual anterior teeth may be updated so that the distance between the maxilla and the mandible is included within a preset value range in an exercise state. For example, if the tooth to be restored is an anterior, if there is a contact penetrating the anterior virtual tooth, the contact area and intensity for each region of the remaining anterior region when there is no anterior virtual tooth is the same, and the occlusal contact with the virtual tooth has the same area and strength The shape of the virtual tooth can be changed to provide If there is no contact with the virtual tooth, the lingual surface of the maxilla and the cut surface of the mandible are virtual until the incisal surface of the maxilla and the incisal surface of the mandible meet when the range of motion is greater than the preset value (eg 0.5mm) using the condylor angle information. The shape of the virtual tooth may be changed so that the occlusion of the same area and intensity is brought into contact with the virtual tooth while the contact area and intensity for each region of the remaining anterior portion are the same when there are no teeth.

23 to 24 are diagrams for explaining an operation of determining, by the device 100, a virtual posterior tooth based on a virtual articulator, according to an exemplary embodiment.

23 to 24 , the 3D modeling image includes the posterior virtual teeth, and the size or position of the posterior virtual teeth may be determined so that the maxilla and the mandible contact each other in an occlusal state. That is, when the tooth to be restored is the posterior part, it can be adjusted so that it comes into contact with the opposing tooth in the occlusal state, and has an average contact area and contact strength with other teeth.

In one embodiment, the magnitude of the force applied when the posterior virtual teeth abut with each other in the occlusal state may correspond to the magnitude of the force applied when the posterior real teeth abut with each other in the occlusal state, and in another embodiment, A mutual contact area when the posterior virtual teeth abut against each other in an occlusal state may correspond to a mutual contact area when the posterior real teeth abut against each other in an occlusal state.

For example, in the occlusal state, when the tooth to be restored is the posterior part and there is a contact with the virtual tooth, the processor 110 sets the occlusal point on the virtual tooth to be the same as the contact area and intensity for each area of the remaining posterior part when there is no virtual tooth. can be given If there is no contact with the virtual tooth, when the mandible is occluded in a static state (CO state), the shape of the virtual tooth may be changed so that the virtual tooth only comes into contact with the position of the contact point. At this time, if the shape is changed to fit only the occlusal contact point, the shape may be undesirably displayed because other external parts (eg, cusp slope or triangular ridge) do not match well. In this case, it is possible to support the user to add by providing a menu plate capable of user manipulation regarding the shape, and to perform automatic adjustment. For example, when 0.3 mm floats from the occlusal point at the first point and 0.5 mm rises from the occlusal point at the second point (refer to identification number 2410), the area of the occlusion point may be raised by 0.3 mm and 0.5 mm as a whole (identification number). 2420). The area is divided into the first point and the second point with the main groove 2430 as the center, and the user selects the divided area through the menu plate and raises or lowers the area to adjust the height. In the case of molars, the main groove 2430 may divide four regions into two, and in the case of premolars, the main groove 2430 may divide two regions into one.

For another example, in the dynamic movement, when the tooth to be restored is the posterior part and there is a contact with the virtual tooth, the processor 110 sets the contact area and intensity for each area of the virtual tooth to 0, but the mandible moves so that it is sufficiently aroused. A virtual tooth may be formed in a shape separated by a set value (eg, 0.5 mm, user setting) from the path, that is, the movement path of the condylor angle.

In an embodiment, the processor 110 determines a situation for the posterior virtual tooth as one of canine guidance and a group function, and based on the determined situation for the posterior virtual tooth, The size or location can be determined. This will be further described with reference to FIG. 25 .

25 is a view for explaining an operation in which the device 100 determines a situation for a posterior virtual tooth as one of K-Nine guidance and a group function, according to an embodiment.

Referring to FIG. 25 , the processor 110 may determine a situation for the posterior virtual tooth as one of K-Nine guidance and a group function based on lateral movement among dynamic data. For example, if the tooth to be restored is the posterior part, it is possible to analyze the situation in which the teeth touch each other in the process of moving the mandible left and right to distinguish whether it is a K9 guidance or a group function, and adjust the posterior virtual teeth in a different way accordingly.

In one embodiment, the processor 110 determines the situation for the posterior virtual teeth as a group function when several teeth are being simultaneously contacted in the posterior region according to lateral movement among the dynamic data, only the canine teeth are in contact, and the rest are not in contact If not, it can be decided by K-Nine Guidance. For example, the group function may mean a case where teeth 4, 5, and 6 touch each other, and K-Nine guidance may mean a situation where only teeth 3 and teeth 4, 5, and 6 do not touch, and the processor 110 ) can 3D model the virtual tooth by correcting the virtual tooth in a corresponding manner according to such a situation.

In one embodiment, when the processor 110 performs a dynamic lateral motion, when the situation for the posterior virtual tooth is determined as a group function and the tooth to be restored is the anterior, if there is contact with the virtual tooth, the Bennett angle 1310 In the movement path, the contact area and intensity for each area of the virtual tooth can be set to 0, and when the maxilla and the mandible need to be restored at the same time, the contact area and intensity for each area can be set to 0 by deleting the mandible. If there is no contact with the virtual tooth, the virtual tooth may be formed in a form separated by a set value (eg, 0.5 mm) from the path of the mandible on the line where there is no contact between the central occlusion and the forward movement.

In an embodiment, when the tooth to be restored is a canine and the situation for the posterior virtual tooth is determined by K-Nine guidance, the processor 110 may occlude the virtual tooth so that the cusp of the maxilla and the apex of the mandible are in contact with the virtual tooth. can change the shape of In addition, if the tooth to be restored is an anterior excluding the canine, the contact area and intensity for each area of the virtual tooth may be set to 0.

In one embodiment, the processor 110 determines that the tooth to be restored is the posterior part, and if the virtual tooth is in contact, the situation for the posterior virtual tooth on the working side (eg, the moving side during lateral movement) is determined as K-Nine guidance, virtual The contact area and intensity for each area of the tooth may be set to 0.

In an embodiment, the processor 110 determines the contact area and intensity of the residual posterior region when there is no virtual tooth when the situation for the posterior virtual tooth on the working side (eg, the moving side during lateral movement) is determined as a group function. Occlusal contact with an occlusal area can be given to the virtual tooth within a range that is less than the front tooth and larger than the back tooth. In the case of 2 molars, occlusal contact may not be provided.

In one embodiment, when the processor 110 has no contact with the virtual tooth and the situation for the posterior virtual tooth is determined as a group function on the working side, the contact area and intensity of each remaining posterior region when there is no virtual tooth is in front The shape of the virtual tooth may be changed so that the virtual tooth has an occlusal contact area within a range that is less than the tooth and larger than the tooth behind the tooth. In an embodiment, the occlusal contact area may be quantified and displayed through an area calculation.

In an embodiment, the processor 110 may display the first 3D modeling image not including the virtual tooth and the second 3D modeling image including the virtual tooth together, so that a more intuitive comparison from the user's point of view is possible. Possible interfaces can be provided.

The processor 110 according to an embodiment may perform a series of operations for providing the virtual articulator, may be implemented as a central processor unit (CPU) that controls overall operation of the device 100 , and the memory 120 ), the display and other components may be electrically connected to control the data flow between them.

In an embodiment, the memory 120 may store CT data and scan data. In an embodiment, the memory 120 is implemented as a non-volatile memory such as a solid state disk (SSD) or a hard disk drive (HDD) and may be used to store overall data required for the device 100, and other general purpose Additional components may be included.

In addition, it can be understood by those skilled in the art that other general-purpose components other than those shown in FIG. 1 may be further included in the device 100 . According to an embodiment, the device 100 includes an algorithm for 3D image data processing, a communication module for communicating with other devices through a wired/wireless network, a user interface receiving module for receiving a user input, and displaying the above-mentioned information. It may further include a display, and according to another embodiment, some of the components shown in FIG. 1 may be omitted.

26 is a flowchart illustrating an example of a method for the device 100 to provide a virtual articulator according to an embodiment.

Referring to FIG. 26 , in step S2610, the device 100 acquires the patient's CT data, scan data, and dynamic data, respectively, and in step S2620, the CT data and scan data are matched to obtain a 3D modeling image, yes For example, if there are many foundations or prostheses in the right corner of the tooth, registration can be performed using a resin marker.

In operation S2630, the device 100 may match the matched 3D modeling image and dynamic data on the limit motion. In an embodiment, the device 100 determines the condylar angle 1030 by detecting the center of the condylar according to the forward movement of the dynamic data, and the distance the condylar moves to the limiting motion through the condylar angle 1030 and measuring the angle, determining the Bennett angle 1310 by detecting the center of the condyle according to the lateral movement of the dynamic data, and measuring the distance and angle the condyle moved to the limiting motion through the Bennett angle 1310 have. Accordingly, it is possible to reproduce the motion up to the limiting motion, and to limit the motion path from the forward motion to the point where the maxillary buccal cusp and the mandibular buccal cusp engage on the working side to the point where the cut surfaces of the maxillary anterior and mandibular incisors engage.

In step S2640, the device 100 sets a margin through inflection of the deleted tooth on the 3D modeling image, determines the shape of the virtual tooth based on the library in step S2650, and determines the shape of the virtual tooth based on the margin set in step S2660. location can be determined.

In operation S2670, the device 100 may display the occlusal state on the 3D modeling image based on the static data, the dynamic data, and the condylar movement data.

In an embodiment, if the tooth to be restored is an anterior, the device 100 may determine a contact area and/or contact strength for each region of a residual tooth in the absence of the virtual tooth and in the presence of the virtual tooth, respectively. If the virtual tooth is in contact, the virtual tooth may be formed in such a way that the contact area and intensity for each area of the virtual tooth are set to 0, or the closeness of occlusion is 0.5 mm away from the path in which the mandible moves. If there is no contact with the virtual tooth, a lot of contact may occur, so the virtual tooth can be formed 0.5 mm away from the path of the mandible and the shape of the virtual tooth can be changed during forward movement.

In another embodiment, if the tooth to be restored is the posterior part, the device 100 may determine the contact area and/or contact intensity for each region of the residual tooth in the absence of the virtual tooth and in the presence of the virtual tooth, respectively. If there is contact with the virtual teeth, occlusal contact with the same area and intensity may be applied to the virtual teeth while the contact area and intensity for each region of the residual posterior part when there is no virtual tooth are the same (in this case, in the case of the occlusal point, the occlusal contact may vary depending on the arrangement state). If there is no contact with the virtual tooth, it must be in contact, so the shape of the virtual tooth is changed so that the virtual tooth only touches the contact point location according to the path of the movement of the mandible, and the protruding part to match the occlusal contact point is matched with the shape of the remaining virtual teeth. It provides a menu plater that adjusts to fit, so that the user can add it, or, for example, if 0.3mm from the occlusal point at the first point and 0.5mm from the occlusal point at the second point, then the area of the occlusal point as a whole is 0.3mm and 0.5mm can be raised. The first point and the second point may divide the entire area with the groove as the center, and the area may be given by k square millimeters based on the occlusal area.

According to an embodiment of the present invention, in the process of designing a dental crown with software, a virtual articulator can be provided based on patient data, and user satisfaction is more effective and occlusal adjustment is possible in manufacturing a patient-customized crown. can improve

In addition, the movement of the condyle can be reproduced as it is by using the patient's dynamic data, and the occlusal style of the residual teeth can be determined according to the simulation result, and a crown customized for the patient can be manufactured through the appropriate restoration process.

In addition, the patient's occlusion status can be analyzed by controlling the patient's dynamic data, and the result of this analysis can be reflected in the patient's treatment process to support the improvement of treatment performance.

Throughout the drawings, for convenience of explanation, the shapes of condyles and virtual teeth are shown in two dimensions, but embodiments expressed in three dimensions based on 3D modeling data may be included. Determination and correction of values for various items such as the central position, the Condylor angle, the Bennett angle, the shape, size, and position of the virtual tooth may be performed. Also, throughout the specification, the expression “providing” information may include displaying or transmitting/receiving corresponding information. Also, some of the above-described operations may be implemented in variously modified forms in terms of order, function, and branching.

Meanwhile, the above-described method can be written as a program that can be executed on a computer, and can be implemented in a general-purpose digital computer that operates the program using a computer-readable recording medium. In addition, the structure of the data used in the above-described method may be recorded in a computer-readable recording medium through various means. The computer-readable recording medium includes a storage medium such as a magnetic storage medium (eg, ROM, RAM, USB, floppy disk, hard disk, etc.) and an optically readable medium (eg, CD-ROM, DVD, etc.) do.

A person of ordinary skill in the art related to this embodiment will understand that it may be implemented in a modified form within a range that does not deviate from the essential characteristics of the above description. Therefore, the disclosed methods are to be considered in an illustrative rather than a restrictive sense. The scope of the present disclosure is indicated in the claims rather than the foregoing description, and all differences within the scope equivalent thereto should be construed as being included in the present disclosure.

100: device
110: processor
120: memory

Claims (16)

A method of providing a virtual articulator, comprising:
acquiring a 3D modeling image by matching the CT data and the scan data of the object;
acquiring dynamic data for the 3D modeling image;
obtaining condylar movement data representing movement of a condyle included in the object by using the dynamic data; and
providing a virtual articulator simulating the movement of the object based on the 3D modeling image and the condylar movement data.
The method of claim 1,
The condylar movement data is
and data indicating a movement path of the condyle when the subject performs an anterior movement and a lateral movement within a limit movement range.
The method of claim 1,
The condylar movement data is
A method comprising: a Condylar angle obtained when the forward motion of the object is performed within a limit motion range.
The method of claim 1,
The condylar movement data is
and a Bennet angle obtained when the lateral motion of the object is performed within a limit motion range.
The method of claim 1,
The 3D modeling image includes an anterior virtual tooth,
The size or position of the anterior virtual tooth is determined such that the distance between the maxilla and the mandible in the occlusal state is within a preset value range.
The method of claim 1,
The 3D modeling image includes posterior virtual teeth,
The size or position of the posterior virtual teeth is determined so that the maxilla and the mandible are in contact with each other in an occlusal state.
7. The method of claim 6,
The magnitude of the force applied when the posterior virtual teeth abut against each other in the occlusal state corresponds to the magnitude of the force applied when the posterior real teeth abut with each other in the occlusal state, the method.
7. The method of claim 6,
The method, wherein the mutual contact area when the posterior virtual teeth abut against each other in the occlusal state corresponds to the mutual contact area when the posterior real teeth abut with each other in the occlusal state.
7. The method of claim 6,
determining the situation for the posterior virtual tooth as one of canine guidance and a group function; and
Determining the size or position of the posterior virtual tooth based on the determined situation with respect to the posterior virtual tooth; further comprising, the method.
A device for providing a virtual articulator, comprising:
A 3D modeling image is obtained by matching the CT data and the scan data of the object, the dynamic data of the 3D modeling image is obtained, and the condylar movement data representing the movement of the condyle included in the object by using the dynamic data a processor that obtains and provides a virtual articulator that simulates the movement of the object based on the 3D modeling image and the condylar movement data; and
A device comprising a; a memory for storing the CT data and the scan data.
11. The method of claim 10,
The condylar movement data is
A device comprising: data indicating a movement path of the condyle when the object performs a forward motion and a lateral motion within a limit motion range.
11. The method of claim 10,
The condylar movement data is
A device comprising a Condylar angle obtained when the forward motion of the object is performed within a limit motion range.
11. The method of claim 10,
The condylar movement data is
A device comprising a Bennet angle obtained when the lateral motion of the object is performed within a limit motion range.
11. The method of claim 10,
The 3D modeling image includes an anterior virtual tooth,
The size or position of the anterior virtual tooth is determined such that the distance between the maxilla and the mandible in the occlusion state is within a preset value range.
11. The method of claim 10,
The 3D modeling image includes posterior virtual teeth,
The size or position of the posterior virtual teeth is determined so that the maxilla and the mandible come into contact with each other in an occlusal state.
10. A computer-readable recording medium recording a program for executing the method of any one of claims 1 to 9 on a computer.

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