KR102320857B1 - Method for orthodontic treatment and apparatus thereof - Google Patents

Abstract

A calibration design method and apparatus are disclosed. An orthodontic design method and apparatus according to an embodiment determine a patient type including tooth extraction and non-extraction through simulation based on the set upper central central incisor position after setting the position of the upper central incisor according to the facial change.

Description

Orthodontic design method and apparatus thereof {Method for orthodontic treatment and apparatus thereof}

The present invention relates to image analysis and processing technology, and more particularly, to digital correction diagnosis and treatment plan establishment technology through image analysis.

Malocclusion is a condition in which the upper and lower teeth are not aligned properly and the occlusion of the upper and lower teeth is abnormal. Such malocclusion may cause functional problems such as mastication and pronunciation problems and aesthetic problems on the face, as well as health problems such as tooth decay and gum disease. Therefore, orthodontic treatment to make this malocclusion into a normal occlusion should be performed. In order to determine the appropriate treatment method, before orthodontic treatment, orthodontic diagnosis and treatment plan are established from clinical data in orthodontic software, and virtual setup data is created so that the teeth are arranged in an ideal shape. is required

In general orthodontic software, after two-dimensional measurement value analysis using a cephalo-lateral photograph, the patient type including extraction or non-extraction type is determined using the deviation from the average value. However, this two-dimensional analysis may cause difficulties in setting the actual three-dimensional tooth position. In addition, when it is necessary to select the type of extraction and non-extraction, especially when it is at the borderline between extraction and non-extraction, it is often dependent on the experience of the doctor. Furthermore, analysis and simulation of measurement values centered on the two-dimensional skeletal structure cannot accurately predict facial changes, which may reduce patient satisfaction after treatment.

We propose an orthodontic design method and device that can establish a more accurate orthodontic treatment plan and increase patient satisfaction after treatment through analysis and simulation of measurement values centered on facial structure that predicts facial changes when establishing an orthodontic treatment plan using software. .

An orthodontic design method according to an embodiment includes the steps of providing a facial change according to the movement amount of the central incisor of the patient, determining the position of the upper central incisor according to the facial change, and performing extraction and extraction through simulation based on the determined position of the upper central incisor. and determining the patient type, including non-extraction.

In the step of providing the facial change, in the facial scan data acquired from the patient, the distance that the upper labia enters when the central central incisors of the maxilla enter the predetermined distance, the distance that the lower labia enters when the central incisors of the lower jaw enter the predetermined distance, and when the central incisors of the maxilla enter the predetermined distance. At least one of the increasing nasolabial angles may be measured to show facial changes.

In the step of determining the position of the central central incisor, the vertical, horizontal, and frontal positions of the central central incisors of the maxilla according to facial changes in three dimensions may be determined by analyzing the patient's clinical data. The clinical data may be CT data of a patient or registration data obtained by matching the CT data and the head photograph.

The step of determining the position of the maxillary central incisor is to measure the angle formed with at least one of the SN connection line, FH connection line, PP connection line, and NA connection line based on the maxillary central incisor apex extension line that changes according to facial changes in the clinical data in the lateral direction. and determining the horizontal position of the maxillary central incisor by comparing the measured angle with a preset reference value, the reference value being changeable by the user.

In the step of determining the position of the maxillary central incisor, the vertical position of the maxillary central incisor is determined so that the maxillary central incisor, which changes according to facial changes in the lateral clinical data, is located at a preset distance below the upper lip, and the preset distance value is determined by the user. can be changed by

The step of determining the position of the central central incisor is the step of setting the front of the central incisor in the frontal direction clinical data, and after setting the frontal setting, the FACC and the repair to the occlusal plane are performed for the central incisors that change according to the change of the patient's facial appearance. Measuring the mesiodistal angle formed, and comparing the measured angle with a preset reference value to determine the frontal position of the maxillary central incisor, the reference value being changeable by the user.

The orthodontic design method may further include determining a lower central incisor position after determining the upper central incisor position. The step of determining the position of the mandibular central incisor includes measuring the angle formed with at least one of the maxillary central incisor axis extension line, the mandibular connection line, and the NB connection line based on the mandibular central incisor axis extension line in the clinical data in the lateral direction; and determining the lateral position of the mandibular central incisor by comparing the angle with a preset reference value, the reference value being changeable by the user.

The step of determining the position of the central mandibular incisor includes the steps of setting the frontal mandibular central incisor from the clinical data in the frontal direction, measuring the mesiodistal angle between the FACC and the perpendicular to the occlusal plane for the central mandibular incisor, and the measured angle. and determining the frontal position of the mandibular central incisor by comparing with a preset reference value, the reference value being changeable by the user.

Determining the patient type includes arranging the remaining individual teeth along the arch line based on the position of the determined upper central incisor, determining whether non-extraction treatment is possible from the tooth arrangement, and determining extraction if non-extraction treatment is not possible And it may include the step of determining the tooth extraction through the simulation.

The step of determining the tooth to be extracted includes the steps of selecting a predetermined tooth from the tooth arrangement and predicting the amount of tooth movement of individual teeth at the time of tooth extraction, and determining the tooth to be extracted by comparing the predicted amount of tooth movement with a preset threshold. can do.

The orthodontic design method may further include regenerating the final tooth arrangement after orthodontic treatment according to the determined patient type.

An orthodontic design apparatus according to another embodiment includes a data acquisition unit that acquires clinical data of a patient, classifies diagnostic items for facial change analysis, and sets at least one of a measurement point and a connection line for each classified diagnostic item. A control unit that determines the position of the maxillary central incisor according to the change of the patient's facial appearance by analyzing clinical data, and determines the patient type including extraction and non-extraction through simulation based on the determined position of the maxillary central incisor, and the tooth arrangement according to the treatment plan It includes an output unit that

The controller may analyze the patient's clinical data to determine vertical, horizontal, and frontal positions of the maxillary central incisors according to facial changes in three dimensions.

After arranging the remaining individual teeth along the maxillary central incisor position based on the determined position of the maxillary central incisor, the control unit determines whether non-extraction treatment is possible from the tooth arrangement, and if non-extraction treatment is not possible, determines extraction and determines the extracted tooth through simulation, By selecting a predetermined tooth from the tooth arrangement and predicting the tooth movement amount of individual teeth at the time of extraction, the tooth to be extracted can be determined.

According to the orthodontic design method and the apparatus according to an embodiment, face-centered orthodontic treatment is possible by analyzing the facial structure to predict facial changes and establishing an orthodontic treatment plan. Compared to skeletal-centered orthodontic treatment, facial-centered orthodontic treatment can predict changes in the facial expression, thereby increasing the aesthetic satisfaction of patients during treatment.

In particular, by determining the position of the maxillary central incisor according to facial changes, performing simulations based on the determined position of the maxillary central incisors, and establishing a treatment plan accordingly, facial changes can be best reflected to confirm the proper treatment status centered on the face. can At this time, after determining the position of the maxillary central incisor in three dimensions in the horizontal, vertical and frontal directions, and selecting the extraction and non-extraction patient type through simulation according to the position of the determined position of the central central incisor, the facial appearance after treatment according to the three-dimensional tooth movement is predicted. can see.

The three-dimensional measurement value analysis and simulation is difficult when setting the actual three-dimensional tooth position, which was a problem during the two-dimensional measurement value analysis and simulation, and it is necessary to choose whether to extract or not, or the boundary between extraction and non-extraction ( Borderline, where doctors rely on experience to solve problems that make mistakes.

1 is a view showing the configuration of a calibration design device according to an embodiment of the present invention;
2 is a view showing an example of dividing a tooth image for tooth movement and analysis according to an embodiment of the present invention;
3 is a view showing a tooth image forming the tooth outline in the occlusal surface according to an embodiment of the present invention;
4 is a view showing a side face image showing changes in the lips according to the amount of movement of the central incisors according to an embodiment of the present invention;
5 is a view showing a side view of the face showing a change in the Nasolabial Angle according to the amount of movement of the central incisors according to an embodiment of the present invention;
6 is a view showing an example of determining the horizontal position of the maxillary central incisors according to facial changes according to an embodiment of the present invention;
7 is a view showing an example of determining the vertical position of the maxillary central incisor according to facial changes according to an embodiment of the present invention;
8 is a view showing an example of determining the frontal position of the maxillary central incisor according to facial changes according to an embodiment of the present invention;
9 is a view showing an example of determining the lateral position of the mandibular central incisor with respect to the position of the maxillary central incisor according to an embodiment of the present invention;
10 is a view showing an example of determining the frontal position of the mandibular central incisor with respect to the position of the maxillary central incisor according to an embodiment of the present invention;
11 is a view showing a tooth arrangement centered on the determined position of the maxillary central incisor according to an embodiment of the present invention;
12 is a view showing an example of selecting a tooth to be extracted when determining tooth extraction according to an embodiment of the present invention;
13 is a view showing simulation results before and after treatment according to an embodiment of the present invention;
14 is a diagram illustrating a flow of a calibration design method according to an embodiment of the present invention.

Advantages and features of the present invention, and a method for achieving them will become apparent with reference to the embodiments described below in detail in conjunction with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, but may be implemented in various different forms, and only these embodiments allow the disclosure of the present invention to be complete, and common knowledge in the art to which the present invention pertains. It is provided to fully inform the possessor of the scope of the invention, and the present invention is only defined by the scope of the claims. Like reference numerals refer to like elements throughout.

In the description of the embodiments of the present invention, if it is determined that a detailed description of a known function or configuration may unnecessarily obscure the gist of the present invention, the detailed description will be omitted, and the terms to be described later are used in the embodiment of the present invention. These terms are defined in consideration of the function of Therefore, the definition should be made based on the content throughout this specification.

Each block in the accompanying block diagram and combinations of steps in the flowchart may be executed by computer program instructions (execution engine), which computer program instructions are executed by the processor of a general-purpose computer, special-purpose computer, or other programmable data processing device. It may be mounted so that its instructions, which are executed by the processor of a computer or other programmable data processing device, create means for performing the functions described in each block of the block diagram or in each step of the flowchart.

These computer program instructions may also be stored in a computer-usable or computer-readable memory that may direct a computer or other programmable data processing device to implement a function in a particular manner, and thus the computer-usable or computer-readable memory. It is also possible for the instructions stored in the block diagram to produce an article of manufacture containing instruction means for performing the functions described in each block of the block diagram or each step of the flowchart.

And since the computer program instructions may be mounted on a computer or other programmable data processing device, a series of operational steps is performed on the computer or other programmable data processing device to create a computer-executable process to create a computer or other programmable data processing device. It is also possible that the instructions for performing the data processing apparatus provide steps for executing the functions described in each block of the block diagram and each step of the flowchart.

In addition, each block or step may represent a module, segment, or portion of code comprising one or more executable instructions for executing specified logical functions, and in some alternative embodiments the blocks or steps referred to in the block or steps. It should be noted that it is also possible for functions to occur out of sequence. For example, it is possible that two blocks or steps shown one after another may be performed substantially simultaneously, and also the blocks or steps may be performed in the reverse order of the corresponding functions, if necessary.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. However, the embodiments of the present invention illustrated below may be modified in various other forms, and the scope of the present invention is not limited to the embodiments described below. The embodiments of the present invention are provided to more completely explain the present invention to those of ordinary skill in the art to which the present invention pertains.

1 is a view showing the configuration of a calibration design apparatus according to an embodiment of the present invention.

Referring to FIG. 1 , the orthodontic design device 1 performs orthodontic design to help straighten teeth in actual dentistry. Orthodontic design work is a virtual tooth setup in which the patient's clinical data is acquired, the treatment plan is established by performing a simulation through diagnosis and analysis using the clinical data through software control, and the teeth are rearranged according to the established treatment plan. It refers to a series of processes that create data.

The calibration design device 1 according to an embodiment may include an electronic device capable of executing a calibration design program, and a server communicating with the electronic device through a network. The electronic device includes a computer, a notebook computer, a laptop computer, a tablet PC, a smart phone, a mobile phone, a personal media player (PMP), and personal digital assistants (PDA).

The orthodontic design device 1 according to an embodiment analyzes the facial structure of the patient and predicts facial changes while establishing an orthodontic treatment plan, thereby enabling facial-centered orthodontic treatment. Compared to skeletal-centered orthodontic treatment, facial-centered orthodontic treatment can predict changes in the facial expression, thereby increasing the aesthetic satisfaction of patients during treatment.

For orthodontic treatment focusing on facial changes, first, the position of the maxillary central incisors according to facial changes is determined, and then a treatment plan is established. For example, the position of the maxillary central incisors is determined three-dimensionally in the horizontal, vertical and frontal directions. And by determining the extraction and non-extraction patient types through simulation centering on the position of the determined maxillary central incisor, it is possible to predict facial changes after treatment according to three-dimensional tooth movement.

In addition, we intend to perform three-dimensional measurement value analysis and simulation for orthodontic treatment centered on facial changes. The three-dimensional measurement value analysis and simulation-based orthodontic treatment plan establishment method has difficulties in setting the actual three-dimensional tooth position, which was a problem during the two-dimensional measurement value analysis and simulation, and it is necessary to choose whether to extract or not. When you are at the borderline between extraction and non-extraction, you can solve the problem of making mistakes that doctors rely on experience.

Hereinafter, the configuration of the calibration design device 1 having the above-described characteristics will be described below with reference to FIG. 1 .

Referring to FIG. 1 , the calibration design apparatus 1 according to an embodiment includes a data acquisition unit 10 , a storage unit 12 , a control unit 14 , an input unit 16 , and an output unit 18 .

The data acquisition unit 10 acquires clinical data from a patient. Clinical data necessary for orthodontic treatment include cephalo-lateral photographs, CT data, panoramic data, face scan data, cephalometric X-ray data, and frontal radiographs (PA X-rays). ray) data, etc.

The scan data is data having information on actual teeth including damaged teeth. The scan data may be dental model scan data obtained by scanning a plaster model created by imitating a patient's oral cavity with a 3D scanner. As another example, it may be oral scan data obtained by scanning the inside of the patient's oral cavity using a 3D intra-oral scanner. The acquired scan data may be stored in the storage unit 12 .

CT data may be obtained by generating tomographic images of the patient's head using computed tomography (CT), segmenting the tooth boundaries in each tomography image, and combining them into one. These scan data and CT data are images obtained by imaging the maxillary teeth under the maxillary teeth with the patient’s mouth open, images obtained by imaging the mandibular teeth above the mandibular teeth with the patient’s mouth open, and local area imaging with the mouth closed. images, oral radiographs, etc. The acquired CT data may be stored in the storage unit 12 . The CT data may be CBCT data. The CT data may be data in a three-dimensional form.

The control unit 14 prepares data prior to analyzing the patient's clinical data. Data preparation may include matching between data, separating individual teeth, extracting feature information, and extracting reference information. Data registration refers to matching between two data constituting clinical data, and the two data may be head radiograph and CT data, head radiograph data and CT data, and oral scan data and CT data, respectively.

The control unit 14 separates the individual teeth from at least one of data on which registration is performed or two data constituting clinical data. Individual tooth separation can be performed using a tooth number. Also, it is possible to extract feature information from the separated individual teeth. The characteristic information includes, for example, a tooth axis, an occlusal point, a tooth direction, a contact point with surrounding teeth, a Facial Axis of the Clinical Crown (FACC), a FA point, and the like. FA points are the focal point of FACC.

After determining the position of the maxillary central incisor according to the facial change, the controller 14 determines the patient type including extraction and non-extraction through simulation based on the determined position of the central central incisor. In this case, facial correction treatment is possible by determining the position of the maxillary central incisors according to facial changes. Compared to skeletal-centered orthodontic treatment, facial-centered orthodontic treatment can check the amount of facial changes, which can increase the aesthetic satisfaction of patients during treatment.

The controller 14 may determine the patient type through a three-dimensional tooth movement simulation by analyzing the CT data or matching data obtained by matching the CT data and other clinical data (eg, a head photograph). In two-dimensional data analysis, it may be difficult to determine the actual two-dimensional tooth position, and when it is necessary to select extraction or non-extraction, or when it is at the borderline between extraction and non-extraction, it often relies on experience. This two-dimensional analysis may cause difficulties in determining the actual three-dimensional tooth position.

The controller 14 according to an embodiment determines the position of the maxillary central incisor according to the facial change in the vertical, horizontal, and frontal directions through three-dimensional analysis of clinical data.

E.g. In order to determine the horizontal position of the maxillary central incisor, the control unit 14 forms with at least one of the SN connection line, the FH connection line, the PP connection line, and the NA connection line based on the apical axis extension line of the maxillary central incisor that changes according to facial changes in the clinical data in the lateral direction. Measure the angle. Next, the horizontal position of the maxillary central incisor is determined by comparing the measured angle with a preset reference value. The reference value can be changed by the user. An embodiment of determining the horizontal position of the maxillary central incisor will be described later with reference to FIG. 6 .

For determining the vertical position of the maxillary central incisor, the control unit 14 determines the vertical position of the maxillary central incisors so that the maxillary central incisors, which change according to facial changes in the lateral clinical data, are located below a preset distance from the lower upper labial region. The preset distance value can be changed by the user. An embodiment of determining the vertical position of the maxillary central incisor will be described later with reference to FIG. 7 .

To determine the frontal position of the maxillary central incisors, the controller 14 measures the mesio-distal angle between the FACC and the perpendicular to the occlusal plane for the maxillary central incisors that change according to facial changes in the clinical data in the frontal direction. Then, comparing the measured angle with a preset reference value to determine the frontal position of the maxillary central incisor. The reference value can be changed by the user. An embodiment of determining the frontal position of the maxillary central incisor will be described later with reference to FIG. 8 .

After the controller 14 determines the upper central incisor position, the controller 14 may determine the lower central incisor position. The position of the mandibular central incisors in the lateral and frontal directions can be determined.

For example, in order to determine the lateral position of the central mandibular incisor, the control unit 14 forms with at least one of a central maxillary central incisor axial extension line, a mandibular connection line, and an NB connection line based on the mandibular central incisor axial extension line in the clinical data in the lateral direction. Measure the angle. Next, the horizontal position of the mandibular central incisor is determined by comparing the measured angle with a preset reference value. The reference value can be changed by the user. An embodiment of determining the lateral position of the mandibular central incisor will be described later with reference to FIG. 9 .

To determine the frontal position of the mandibular central incisors, the frontal of the mandibular central incisors is set from the frontal clinical data, and the mesio-distal angle between the FACC and the perpendicular to the occlusal plane is measured for the central mandibular incisors. Next, the frontal position of the mandibular central incisor is determined by comparing the measured angle with a preset reference value. An embodiment of determining the frontal position of the mandibular central incisor will be described later with reference to FIG. 10 .

The controller 14 according to an embodiment determines the patient type including extraction and non-extraction through simulation based on the determined position of the upper central incisor. For example, the controller 14 arranges the remaining individual teeth along the arch line based on the position of the determined upper central incisor. Then, it is determined from the tooth arrangement whether non-extraction treatment is possible, and when non-extraction treatment is possible, the patient type is determined as the non-extraction type. On the other hand, when non-extraction treatment is not possible, extraction is determined, and extraction teeth are determined through simulation. In order to determine a tooth to be extracted, a tooth movement amount of individual teeth is predicted at the time of extraction by selecting a predetermined tooth from a tooth arrangement. In addition, the extracted tooth may be determined by comparing the predicted tooth movement amount with a preset threshold. An embodiment of determining the tooth extraction will be described later with reference to FIG. 12 .

The control unit 14 regenerates the final tooth arrangement after orthodontic treatment according to the determined patient type, and the output unit 14 may display the final arrangement of teeth on a dental image, for example, a CT image. An embodiment thereof will be described later with reference to FIG. 13 .

The storage unit 12 stores various data such as information necessary for performing the operation of the calibration design device 1 and information generated according to the operation. The storage unit 12 may provide data to the control unit 14 for data analysis of the control unit 14 .

The output unit 18 displays a screen including clinical data, a patient type classification result (whether tooth extraction or non-extraction), and a tooth arrangement generated through the control unit 14 .

The input unit 16 receives a user manipulation signal. For example, an operation signal for user correction such as movement and rotation of the tooth arrangement data displayed on the screen is received through the output unit 18 . The input unit 16 may receive a user manipulation signal for adding, deleting, or changing a diagnostic item for patient type classification. In addition, a reference value for categorizing a patient type for each diagnosis item may be input from the user.

2 is a diagram illustrating an example of segmenting a tooth image for tooth movement and analysis according to an embodiment of the present invention.

Referring to FIG. 2 , by analyzing a dental image, for example, CT data, a tooth region is divided into left, right, anterior and posterior teeth. The left and right regions may be divided based on a midline. Anterior and posterior regions can be divided to establish an esthetic treatment plan. Anterior teeth and molars are anatomically positioned differently. According to the anatomical location, anterior teeth refer to three teeth on each side and a total of six teeth on the left and right based on the midline. Molars are the teeth behind the anterior teeth. Anterior and posterior teeth have different morphological characteristics. According to the morphological characteristics, anterior teeth and molars can be distinguished by looking at the shape of the crown. And the molars have cusps. In addition, by looking at the width of the occlusal surface with the opposing teeth, it is also possible to distinguish the anterior teeth from the posterior teeth.

In FIG. 2, a grid paper in the image is displayed to confirm the amount of tooth movement. The grid paper is a guide for checking the amount of movement and is an optional option in the software. Hereinafter, they may also be displayed in the images of the drawings to be described later, but will be omitted for convenience of description.

3 is a view showing a tooth image forming the tooth outline in the occlusal surface according to an embodiment of the present invention.

Referring to FIG. 3 , the tooth outline is formed on the occlusal surface to compare before and after treatment. 6 The anterior teeth form the tooth shape including the contact part. In contrast, the posterior teeth form the shape of the teeth as they are in the shape of the occlusal surface.

4 is a view showing a side face image showing changes in the lips according to the amount of movement of the central incisors according to an embodiment of the present invention.

Referring to FIG. 4 , when the maxillary central incisor enters X (mm) in the facial lateral image, the patient's upper labia enters Y (mm) (X : Y). Also, if the mandibular central incisor enters X' (mm), the patient's lower labia enters Y' (mm) (X' : Y'). The degree of entry of the upper or lower lip can be known by the degree of protrusion of the Pn (Pronasale)-Pog' (Soft tissue Pogonion) connection line in the facial lateral image. Pn (Pronasale) is the most protruding part of the tip of the nose, and Pog' (Soft tissue Pogonion) is the frontmost point of the jawbone.

The amount of change in the upper order according to the movement amount of the upper central incisors and the amount of change in the lower order according to the movement amount of the lower central incisors can be set by the user. This is because, when establishing an orthodontic plan, desired facial changes are different for each patient or dentist.

5 is a view showing a side view of the face showing a change in the Nasolabial Angle according to the amount of movement of the central incisor according to an embodiment of the present invention.

Referring to FIG. 5 , when the maxillary central incisor enters X (mm) in the facial lateral image, the nasal angle increases by Y (°) (X: Y).

6 is a diagram illustrating an example of determining the horizontal position of the maxillary central incisor according to a facial change according to an embodiment of the present invention.

Referring to FIGS. 1 and 6 , the orthodontic design device 1 determines the horizontal position of the maxillary central incisor that changes according to the facial change in the side clinical data 60 . The horizontal position of the maxillary central incisors is determined by adjusting the maxillary central incisors anteriorly and posteriorly. As shown in FIG. 6 , the clinical data 60 may be matched data obtained by matching the patient's head photograph 62 and the 3D CT data 64 . By using the three-dimensional CT data 64, an actual three-dimensional tooth position can be derived.

The information necessary for determining the horizontal position of the maxillary central incisor is the maxillary central incisor extension line 600, SN connecting line (SN Plane), FH connecting line (FH Plane), PP connecting line (Palatal Plane), and NA connecting line (NA) that change according to facial changes. Plane), etc.

The SN connection line (SN Plane) is a line connecting S-N and marks the frontal cranial base. S (Sella) is the focal point of Sella turcica. N(Nasion) is the lowest point of the frontonasal suture. The FH connecting line (FH Plane) is a line connecting Po-Or, and the inside indicates the plane. Po (Porion) is the apex of the external foramen, and Or (Orbital) is the lowest point of the orbit. The PP connection line (Palatal Plane) is a line connecting the PNS-ANS and marks the palatal plane. The posterior nasal spine (PNS) is the posterior nasal spine of the hard palate, and the anterior nasal spine (ANS) is the anterior nasal spine of the hard palate. The NA connection line (NA Plane) is a line connecting N-A. Point A is the most posterior point on the curve between the maxillary basal bone and the alveolar process.

The orthodontic design device (1) measures the angle (°) (①) between the maxillary central incisor axial extension line 600 and the SN connection line (SN Plane), and the angle between the maxillary central incisor axial extension line 600 and the FH connection line (FH plane) (°) ( ②), the angle (°)(③) between the maxillary central incisor apical extension line 600 and the PP connection line (Palatal Plane), and the angle between the maxillary central incisor axis extension line 600 and the NA connection line (NA Plane) (°)(④), respectively. measure Then, the horizontal position of the maxillary central incisor is determined by comparing the measured angle value with a preset reference value and adjusting the position of the maxillary central incisor axial extension line 600 in a direction in which the measured angle value coincides with the preset reference value. The preset reference value can be changed by the user.

7 is a diagram illustrating an example of determining the vertical position of the maxillary central incisor according to a facial change according to an embodiment of the present invention.

Referring to FIGS. 1 and 7 , the orthodontic design device 1 determines the vertical position of the maxillary central incisor that changes according to the facial change in the side clinical data 60 . The vertical position of the maxillary central incisors is determined by adjusting the maxillary central incisors up and down. As shown in FIG. 7 , the clinical data 60 may be matched data obtained by matching the patient's head photograph 62 and the 3D CT data 64 . By using the three-dimensional CT data 64, an actual three-dimensional tooth position can be derived.

The orthodontic design device 1 determines the vertical position of the maxillary central incisors so that the maxillary central incisors 700, which change according to facial changes in the clinical data 60, are located below a preset distance (mm) (①) from the upper labial and lower 710. decide In this case, the preset distance value may be changed by the user.

8 is a diagram illustrating an example of determining the frontal position of the maxillary central incisor according to a facial change according to an embodiment of the present invention.

Referring to FIGS. 1 and 8 , the orthodontic design device 1 determines the frontal position of the maxillary central incisor that changes according to the facial change in the frontal clinical data 60 . As shown in FIG. 8 , the clinical data 60 may be matched data obtained by matching the patient's head photograph 62 and the 3D CT data 64 . By using the three-dimensional CT data 64, an actual three-dimensional tooth position can be derived.

The orthodontic design device 1 sets the frontal position of the maxillary central incisors in order to determine the frontal positions of the maxillary central incisors. You can use Andrew's 6 keys - Angulation for this. At this time, the facial axis 　of the clinical crown (FACC) 800 and the Occ plane vertical line 810 to the occlusal plane 810 targeting the maxillary central incisors that change according to the change in the patient's facial features ) to measure the mesio-distal angle formed by Then, by comparing the measured angle with a preset reference value, the position of the front of the maxillary central incisor is adjusted in a direction in which the measured angle value coincides with the preset reference value. The preset reference value can be changed by the user.

9 is a diagram illustrating an example of determining the lateral position of the mandibular central incisor with respect to the position of the maxillary central incisor according to an embodiment of the present invention.

Referring to FIGS. 1 and 9 , the orthodontic design device 1 determines the position of the central central incisor of the mandible, and then determines the position of the lateral position of the central incisor of the mandible in consideration of the occlusal relationship in the clinical data of the side. As shown in FIG. 9 , the clinical data 60 may be matched data obtained by matching the patient's head photograph 62 and the 3D CT data 64 . By using the three-dimensional CT data 64, an actual three-dimensional tooth position can be derived.

Information necessary for determining the lateral position of the mandibular central incisor includes the maxillary central incisor apical extension line 600, the mandibular central incisor apical extension line 900, the mandibular bone connection line (Mandibular Plane), and the NB connection line (NB Plane).

The Mandibular Plane is a line connecting Go-Me. Go(Gonion) is the intersection of the tangent of the lower edge of the mandible and the tangent of the trailing edge of the mandible, and Me(Menton) is the lowest point on the outline of the mandibular joint and it is on the intersection of the mandible. The NB connection line (NB Plane) is a line connecting N-B. N(Nasion) is the lowest point of the frontonasal suture. Point B is the most posterior point on the curve between the mandibular alveolar process and the pogonion.

The orthodontic design device (1) is the angle (°) (①) between the pubis extension line of the mandibular central incisor (900) and the pubis extension line of the maxillary central incisors (600), the angle (°) between the central incisors extension line (900) of the mandible and the mandibular plane (°) Measure (②), the angle (°) (③) between the mandibular central incisor extension line 900 and the NB connection line (NB Plane), respectively. And the lateral position of the mandibular central incisor is determined by comparing the measured angle value with the preset reference value and adjusting the position of the mandibular central incisor axial extension line 900 in the direction in which the measured angle value matches the preset reference value. . The preset reference value can be changed by the user.

10 is a diagram illustrating an example of determining the frontal position of the mandibular central incisor with respect to the position of the maxillary central incisor according to an embodiment of the present invention.

Referring to FIGS. 1 and 10 , the orthodontic design device 1 determines the position of the maxillary central incisor, and then determines the frontal position of the mandibular central incisor with respect to the position of the maxillary central incisor in the frontal clinical data 60 . As shown in FIG. 10 , the clinical data 60 may be matched data obtained by matching the patient's head photograph 62 and the 3D CT data 64 . By using the three-dimensional CT data 64, an actual three-dimensional tooth position can be derived.

The orthodontic design device 1 sets the frontal position of the mandibular central incisors in order to determine the frontal positions of the mandibular central incisors. You can use Andrew's 6 keys - Angulation for this. At this time, the mesiodistal angle formed by the facial axis 　of the clinical crown (FACC) 900 and the perpendicular (Occ plane vertical line) 910 to the occlusal plane 910 was measured for the mandibular central incisor. do. Then, by comparing the measured angle with a preset reference value, the position of the front of the mandibular central incisor is adjusted in a direction in which the measured angle value coincides with the preset reference value. The preset reference value can be changed by the user. When setting the frontal position of the mandibular central incisor, the upper and lower occlusal relationships and treatment limitations can be additionally considered. For example, the position of the mandibular central incisor may be determined by applying an average value of the relationship between the upper and lower jaws to the determined position of the central central incisor.

11 is a view showing a tooth arrangement centering on the determined position of the maxillary central incisor according to an embodiment of the present invention.

1 and 11 , the orthodontic design device 1 analyzes clinical data, for example, CT data 64 of a patient to determine whether to treat non-extraction treatment. In order to determine whether or not to treat non-extraction treatment, the remaining individual teeth are arranged along the arch line based on the position of the maxillary central incisor 1100 determined on the occlusal surface of the CT data 64 . The maxillary central incisor position 1100 is a position determined in the vertical, horizontal and frontal directions, respectively.

Then, it is determined whether non-extraction treatment is possible from the tooth arrangement arranged along the arch line. At this time, it is possible to determine whether non-extraction treatment is possible in consideration of upper and lower occlusal relationships and treatment limitations. For example, it is possible to determine whether non-extraction treatment is possible by simulating tooth movement during non-extraction treatment and checking whether tooth movement exceeds a threshold. If non-extraction treatment is possible, treatment simulation is performed with non-extraction treatment. In contrast, when non-extraction treatment is not possible, extraction is decided and treatment simulation is performed.

12 is a diagram illustrating an example of selecting a tooth to be extracted when determining tooth extraction according to an embodiment of the present invention.

1 and 12, the orthodontic design device 1 includes an extraction tooth in consideration of upper and lower occlusal relationships and treatment limitations through three-dimensional analysis of clinical data, for example, CT data 64 of a patient. It is possible to determine the extraction conditions. For example, after arranging 6 anterior teeth, when a predetermined tooth is extracted from the tooth arrangement, the tooth movement amount of individual teeth (anterior and posterior) is predicted, and the extracted tooth is determined using the tooth movement amount prediction result. First, check the amount of movement of individual teeth when the #4 tooth is extracted. In FIG. 12 , after selecting tooth #4 as an extraction tooth, the right (left side of the drawing) extraction space is Xmm, and the tooth movement amount of the right posterior part is Xmm. In addition, it can be seen that the left (right side of the drawing) tooth extraction space is Ymm, and the tooth movement amount of the left posterior part is Ymm. At this time, when the amount of tooth movement exceeds a preset treatment threshold, the #4 tooth is determined to be unsuitable as an extraction tooth. In this case, the final extracted tooth is determined after performing the same simulation by selecting tooth #5.

13 is a diagram illustrating simulation results before and after treatment according to an embodiment of the present invention.

1 and 13, the orthodontic design device 1 regenerates the final tooth arrangement after orthodontic treatment according to the patient type by inputting the determined patient type into the tooth arrangement. In FIG. 13, reference numeral 1300 denotes a tooth arrangement before orthodontic treatment, and reference numeral 1310 denotes a final tooth arrangement after orthodontic treatment. Since a three-dimensional tooth movement simulation is performed through the CT data 64, it is possible to check the desired treatment status after selecting tooth extraction and non-extraction.

14 is a diagram illustrating a flow of a calibration design method according to an embodiment of the present invention.

1 and 14, the orthodontic design device 1 provides a facial change according to the movement amount of the central incisor of the patient (S1410). For example, in facial scan data obtained from a patient, when the upper central incisor enters a predetermined distance, the distance through which the upper labia enters may be measured and displayed. In addition, in the face scan data, it is possible to show the distance the lower lip enters when the mandibular central incisor enters a predetermined distance. In the facial scan data, it may show an increasing nasal angle when the maxillary central incisor is moved a predetermined distance.

Next, the orthodontic design device 1 determines the position of the maxillary central incisor according to the facial change (S1420). In the determining of the position of the central central incisor ( S1420 ), the orthodontic design apparatus 1 may analyze the patient's clinical data to determine the vertical, horizontal, and frontal positions of the central central incisors in the maxilla according to facial changes in three dimensions. In this case, the clinical data is the CT data of the patient or the matching data obtained by matching the CT data and the head photograph, and is three-dimensional data.

In the determining the position of the maxillary central incisors ( S1420 ), the orthodontic design device 1 may determine the horizontal position of the maxillary central incisors. For example, in clinical data in the lateral direction, the angle formed with at least one of the SN connection line, FH connection line, PP connection line, and NA connection line is measured based on the maxillary central incisor axial extension line that changes according to facial changes, and the measured angle and the pre-measured angle are measured. The horizontal position of the maxillary central incisor can be determined by comparing the set reference values.

In the determining the position of the maxillary central incisors ( S1420 ), the orthodontic design device 1 may determine the vertical position of the maxillary central incisors. For example, in clinical data in the lateral direction, the vertical position of the maxillary central incisor may be determined so that the maxillary central incisor, which changes according to a facial change, is located below a preset distance from the lower part of the upper labia.

In the positioning step (S1420) of the maxillary central incisors, the orthodontic design device 1 may determine the frontal position of the maxillary central incisors. For example, the frontal maxillary central incisor is set in frontal clinical data, and after the frontal setting, the mesio-distal angle between the FACC and the perpendicular to the occlusal plane is measured for the maxillary central incisor that changes according to the patient's facial changes. And by comparing the measured angle with a preset reference value, it is possible to determine the frontal position of the maxillary central incisor.

After determining the upper central incisor position, the orthodontic design device 1 may determine the lower central incisor position, and may determine the lateral position and the frontal position of the mandibular central incisor.

When determining the lateral position of the mandibular central incisor, the orthodontic design device (1) measures the angle formed with at least one of the maxillary central incisor axial extension line, the mandibular connection line, and the NB connection line based on the central mandibular central incisor extension line in the lateral clinical data. After that, the lateral position of the mandibular central incisor can be determined by comparing the measured angle with a preset reference value.

When determining the frontal position of the mandibular central incisor, the orthodontic design device 1 sets the frontal of the mandibular central incisor from the frontal clinical data, and then measures the mesio-distal angle between the FACC and the perpendicular to the occlusal plane for the mandibular central incisor. Next, the frontal position of the mandibular central incisor is determined by comparing the measured angle with a preset reference value.

Next, the orthodontic design device 1 arranges the remaining individual teeth along the maxillary central incisor position based on the determined position (S1430). And based on the determined position of the maxillary central incisor, the patient type including extraction and non-extraction is determined through simulation (S1440). For example, it is determined whether non-extraction treatment is possible from the tooth arrangement. Determination of extracted teeth For example, after selecting a predetermined tooth from a tooth arrangement and predicting the tooth movement amount of individual teeth during extraction, the extracted tooth is determined by comparing the predicted tooth movement amount with a preset threshold.

Then, the orthodontic design device 1 regenerates the final tooth arrangement after orthodontic treatment according to the determined patient type (S1450).

So far, the present invention has been looked at focusing on the embodiments thereof. Those of ordinary skill in the art to which the present invention pertains will understand that the present invention can be implemented in modified forms without departing from the essential characteristics of the present invention. Therefore, the disclosed embodiments should be considered in an illustrative rather than a restrictive sense. The scope of the present invention 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 invention.

Claims (15)

providing a facial change according to the amount of movement of the central incisor of the patient;
determining the position of the upper central incisor according to the confirmed facial change after confirming the facial change according to the central incisor movement amount;
After determining the upper central incisor position, determining the lower central incisor position; and
arranging the remaining individual teeth along the arch line based on the determined position of the upper central incisor, and determining whether tooth extraction or non-extraction is performed from the tooth arrangement; including,
When determining tooth extraction, a predetermined tooth is selected from the tooth arrangement to predict the tooth movement amount of individual teeth at the time of extraction,
An orthodontic design method, characterized in that by comparing a predicted tooth movement amount with a preset threshold, and selecting another tooth as an extraction tooth when the tooth movement amount exceeds a preset treatment threshold. The method of claim 1 , wherein providing a facial change comprises:
In the facial scan data obtained from the patient, at least one of the distance at which the upper labia enters when the central central incisors of the maxilla enter a predetermined distance, the distance where the lower labia enters when the central incisors of the mandible enter a predetermined distance, and the non-labial angle that increases when the central incisors of the maxilla enter a predetermined distance. Orthodontic design method, characterized in that by measuring the facial changes. The method of claim 1, wherein determining the position of the maxillary central incisor comprises:
An orthodontic design method, characterized in that the vertical, horizontal and frontal positions of the maxillary central incisors are determined according to facial changes in 3D by analyzing the patient's clinical data. 4. The method of claim 3, wherein the clinical data is
An orthodontic design method, characterized in that the patient's CT data or CT data and matching data obtained by matching the head photograph. The method of claim 1, wherein determining the position of the maxillary central incisor comprises:
measuring an angle formed with at least one of an SN connection line, an FH connection line, a PP connection line, and an NA connection line based on the maxillary central incisor axial extension line that changes according to facial changes in the clinical data in the lateral direction; and
determining a horizontal position of the maxillary central incisor by comparing the measured angle with a preset reference value; includes,
A calibration design method, characterized in that the reference value can be changed by the user. The method of claim 1, wherein determining the position of the maxillary central incisor comprises:
Determine the vertical position of the maxillary central incisor so that the maxillary central incisor, which changes according to facial changes in the lateral clinical data, is located at a preset distance below the upper labial,
A calibration design method, characterized in that the preset distance value is changeable by a user. The method of claim 1, wherein determining the position of the maxillary central incisor comprises:
setting the frontal maxillary central incisor frontal in the frontal direction clinical data;
After the frontal setting, measuring the mesio-distal angle between the FACC and the perpendicular to the occlusal plane for the maxillary central incisors that change according to the change in the patient's facial features; and
determining the frontal position of the maxillary central incisor by comparing the measured angle with a preset reference value; includes,
A calibration design method, characterized in that the reference value can be changed by the user. The method of claim 1, wherein determining the mandibular central incisor position comprises:
measuring an angle formed with at least one of a maxillary central incisor apical extension line, a mandibular connection line, and an NB connection line based on the central mandibular central incisor extension line in the clinical data in the lateral direction; and
determining the lateral position of the mandibular central incisor by comparing the measured angle with a preset reference value; includes,
A calibration design method, characterized in that the reference value can be changed by the user. The method of claim 8, wherein the determining of the mandibular central incisor position comprises:
setting the frontal mandibular central incisor in the frontal direction clinical data;
Measuring the mesiodistal angle between the FACC and the perpendicular to the occlusal plane for the mandibular central incisor; and
determining the frontal position of the mandibular central incisor by comparing the measured angle with a preset reference value; includes,
A calibration design method, characterized in that the reference value can be changed by the user. delete delete The method of claim 1, wherein the calibration design method is
Regenerating the final tooth arrangement after orthodontic treatment according to the patient type including whether or not extraction and non-extraction;
Calibration design method, characterized in that it further comprises. a data acquisition unit for acquiring clinical data of a patient;
Classify diagnostic items for facial change analysis and provide facial changes according to the amount of movement of the central incisors of the patient by analyzing the acquired clinical data while at least one of a measurement point and a connecting line is set for each classified diagnostic item, and After confirming the change, the position of the maxillary central incisors is determined according to the confirmed facial changes, the position of the mandibular central incisors is determined after the position of the maxillary central incisors is determined, the remaining individual teeth are arranged along the arch line based on the determined position of the maxillary central incisors, and the teeth are arranged a control unit for determining whether tooth extraction or non-extraction is performed; and
an output unit for displaying the tooth arrangement according to the treatment plan; includes,
the control unit
When determining tooth extraction, after predicting the tooth movement amount of individual teeth at the time of extraction by selecting a predetermined tooth from the tooth arrangement, the predicted tooth movement amount is compared with a preset threshold point. Orthodontic design device, characterized in that selecting the tooth as an extraction tooth. 14. The method of claim 13, wherein the control unit
An orthodontic design device, characterized in that it determines the vertical, horizontal, and frontal positions of the maxillary central incisors according to facial changes in three dimensions by analyzing the patient's clinical data. delete

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