WO2022103141A1 - 교합 정렬 방법 및 교합 정렬 장치 - Google Patents
교합 정렬 방법 및 교합 정렬 장치 Download PDFInfo
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- WO2022103141A1 WO2022103141A1 PCT/KR2021/016307 KR2021016307W WO2022103141A1 WO 2022103141 A1 WO2022103141 A1 WO 2022103141A1 KR 2021016307 W KR2021016307 W KR 2021016307W WO 2022103141 A1 WO2022103141 A1 WO 2022103141A1
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- alignment
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- maxillary
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61C—DENTISTRY; APPARATUS OR METHODS FOR ORAL OR DENTAL HYGIENE
- A61C7/00—Orthodontics, i.e. obtaining or maintaining the desired position of teeth, e.g. by straightening, evening, regulating, separating, or by correcting malocclusions
- A61C7/002—Orthodontic computer assisted systems
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/0059—Measuring for diagnostic purposes; Identification of persons using light, e.g. diagnosis by transillumination, diascopy, fluorescence
- A61B5/0082—Measuring for diagnostic purposes; Identification of persons using light, e.g. diagnosis by transillumination, diascopy, fluorescence adapted for particular medical purposes
- A61B5/0088—Measuring for diagnostic purposes; Identification of persons using light, e.g. diagnosis by transillumination, diascopy, fluorescence adapted for particular medical purposes for oral or dental tissue
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61C—DENTISTRY; APPARATUS OR METHODS FOR ORAL OR DENTAL HYGIENE
- A61C19/00—Dental auxiliary appliances
- A61C19/04—Measuring instruments specially adapted for dentistry
- A61C19/05—Measuring instruments specially adapted for dentistry for determining occlusion
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61C—DENTISTRY; APPARATUS OR METHODS FOR ORAL OR DENTAL HYGIENE
- A61C9/00—Impression cups, i.e. impression trays; Impression methods
- A61C9/004—Means or methods for taking digitized impressions
- A61C9/0046—Data acquisition means or methods
- A61C9/0053—Optical means or methods, e.g. scanning the teeth by a laser or light beam
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- G—PHYSICS
- G06—COMPUTING OR CALCULATING; COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T7/00—Image analysis
- G06T7/0002—Inspection of images, e.g. flaw detection
- G06T7/0012—Biomedical image inspection
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- G—PHYSICS
- G06—COMPUTING OR CALCULATING; COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T7/00—Image analysis
- G06T7/30—Determination of transform parameters for the alignment of images, i.e. image registration
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- G—PHYSICS
- G06—COMPUTING OR CALCULATING; COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T2207/00—Indexing scheme for image analysis or image enhancement
- G06T2207/10—Image acquisition modality
- G06T2207/10028—Range image; Depth image; 3D point clouds
-
- G—PHYSICS
- G06—COMPUTING OR CALCULATING; COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T2207/00—Indexing scheme for image analysis or image enhancement
- G06T2207/30—Subject of image; Context of image processing
- G06T2207/30004—Biomedical image processing
- G06T2207/30036—Dental; Teeth
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- G—PHYSICS
- G16—INFORMATION AND COMMUNICATION TECHNOLOGY [ICT] SPECIALLY ADAPTED FOR SPECIFIC APPLICATION FIELDS
- G16H—HEALTHCARE INFORMATICS, i.e. INFORMATION AND COMMUNICATION TECHNOLOGY [ICT] SPECIALLY ADAPTED FOR THE HANDLING OR PROCESSING OF MEDICAL OR HEALTHCARE DATA
- G16H30/00—ICT specially adapted for the handling or processing of medical images
- G16H30/40—ICT specially adapted for the handling or processing of medical images for processing medical images, e.g. editing
Definitions
- the present invention relates to an occlusion alignment method and an occlusion alignment apparatus, and more particularly, to a method for determining an optimal occlusal position using a tooth area and an apparatus using the same.
- the occlusal surface of the patient may be obtained based on the obtained 3D model.
- the obtained occlusal surface may appear differently depending on the patient's dental strength.
- the periodontal ligament of the patient is pressed according to the periodontal force, and the height at which the periodontal ligament can be pressed anatomically is about 0.2 mm. If the patient's dental strength is strong, the periodontal ligament may be compressed too much. Conversely, if the patient's dental strength is weak, the periodontal ligament may be pressed too little. That is, since the degree of occlusion obtained is different according to the dental strength of the patient, compensation is necessary for the acquired data in consideration of the patient's dental strength.
- the present invention provides an occlusal alignment method and an occlusal alignment device for performing compensation alignment in order to have an optimal occlusion between the maxilla and the mandible of a patient.
- the occlusal alignment method extracts at least one tooth area data from the acquired maxillary scan data and mandibular scan data, and adjusts the occlusal position of the maxillary scan data and the mandibular scan data using the extracted tooth area data provide a way
- the occlusal alignment apparatus includes components for performing the occlusal alignment method, an area extractor for extracting tooth area data, and alignment data having an optimal occlusal position using the extracted tooth area data It includes a compensation aligning unit that performs the process of obtaining .
- the occlusal alignment method and occlusal alignment apparatus according to the present invention may further include additional components in addition to the above-described components.
- the occlusion is properly compensated and aligned with respect to the patient's bite obtained and measured by the three-dimensional scanning method, so that the occlusal force is taken into account in consideration of the patient's dental strength. This has the advantage of optimizing alignment.
- FIG. 1 is a flowchart of an occlusal alignment method according to the present invention.
- 2 to 5 are for explaining maxillary scan data, mandibular scan data, and occlusal scan data in the occlusal alignment method according to the present invention.
- FIG. 6 is for explaining the cheek area data excluded when extracting the tooth area in the occlusal alignment method according to the present invention.
- FIG. 7 is for explaining the generation of first alignment data by aligning maxillary scan data, mandibular scan data, and occlusal scan data in the occlusal alignment method according to the present invention.
- FIG. 8 is a detailed flowchart of the step of adjusting the occlusal position in the occlusal alignment method according to the present invention.
- 9 to 11 are for explaining the step of adjusting the occlusal position in the occlusal alignment method according to the present invention.
- FIG. 14 is a detailed flowchart of a step of selecting at least one of first alignment data and second alignment data in the occlusal alignment method according to the present invention.
- 15 is for explaining an example of a separation diagram that is a basis for selection in the occlusal alignment method according to the present invention.
- 16 is a block diagram of an occlusal alignment device according to the present invention.
- FIG. 1 is a flowchart of an occlusal alignment method according to the present invention.
- the occlusal alignment method includes the steps of obtaining scan data including maxillary scan data, mandibular scan data, and at least one occlusal scan data (S110), and extracting tooth area data from the scan data (S120) , aligning the scan data (S130), adjusting the occlusal positions of the maxillary scan data and the mandibular scan data (S140), and selecting data according to a predetermined criterion (S150).
- a sophisticated three-dimensional model can be obtained, and the user can provide optimal treatment to the patient.
- 2 to 5 are for explaining maxillary scan data, mandibular scan data, and occlusal scan data in the occlusal alignment method according to the present invention.
- FIG. 2 shows scan data of the maxilla 101
- FIG. 3 shows scan data of the mandible 102
- FIG. 4 shows the first occlusion scan data 103
- FIG. 5 shows the second occlusion scan data 104 .
- other additional scan data may be acquired.
- third occlusal scan data (not shown) may be acquired.
- partial scan data (not shown) for precise data acquisition of a specific part in the oral cavity may be additionally acquired.
- Acquiring scan data may mean photographing the inside of the patient's oral cavity using a three-dimensional scanner.
- the scan data may include the maxilla, the mandible, and the occlusal state of the patient, and the scan data may be combined and aligned to generate a three-dimensional model of the patient's entire oral cavity.
- the step of obtaining scan data ( S110 ) may be performed using a three-dimensional scanner that can obtain data by scanning the inside of the patient's mouth, for example, a handheld-scanner, more specifically can be performed through an intraoral scanner.
- the 3D scanner can scan teeth, gingiva, and arch in the oral cavity, and obtain information such as curvature and color of each.
- FIG. 6 is for explaining the cheek area data 501, 502, 503 excluded when the tooth area is extracted in the occlusal alignment method according to the present invention.
- the step of extracting tooth area data from the acquired scan data 100 may be performed.
- the step of extracting the data it is possible to classify which object each data means based on the information of the scan data 100 .
- the scan data 100 according to the artificial intelligence learned algorithm is the gingival area data 200, the tooth area data 300, and the cheek area data 501, 502, 503. can be distinguished from each other.
- the 'buccal area' may mean an inner region of the cheek.
- the artificial intelligence learned algorithm may be an algorithm in which the structure of the oral cavity related to teeth, gingiva, etc. is learned using deep learning technology.
- the algorithm at least one of those including a Deep Neural Network (DNN), a Convolution Neural Network (CNN), a Recurrent Neural Network (RNN), a Generative Adversarial Network (GAN), etc. may be used, and in the algorithm
- DNN Deep Neural Network
- CNN Convolution Neural Network
- RNN Recurrent Neural Network
- GAN Generative Adversarial Network
- the data learned by the method may be the shape of teeth, gingiva, and cheeks, or their colors.
- the tooth area data 300 is extracted using artificial intelligence
- the present invention is not limited thereto, and various methods of extracting the tooth area data 300 may be used.
- the tooth area data 300 may be extracted from the scan data 100 as necessary. More specifically, in the step of extracting data ( S120 ), data corresponding to the tooth area may be distinguished from the maxillary scan data 101 , and data corresponding to the tooth area may be classified from the mandibular scan data 102 . It is advantageous to obtain an optimal occlusion to use the tooth area data 300 among the scan data 100 . That is, by performing the step ( S140 ) of adjusting the occlusal position, which will be described later, using the tooth region data 300 , it is possible to prevent the occlusal position from being erroneously adjusted by a region other than the tooth region.
- the occlusal position may be adjusted by using the tooth area data 300 or the gingival area data 200 and the tooth area data 300 together so as not to be extracted in the extraction step (S120).
- the step of extracting the data ( S120 ) may also perform a process of segmentation of each tooth while extracting the tooth area data 300 .
- the process of individualizing teeth may also be performed according to an AI-learned algorithm, and types of teeth may be individually identified according to the shape, color, shade, curvature, size, etc. of the teeth.
- the process of individualizing teeth may mean dividing teeth included in the maxillary scan data 101 or the mandibular scan data 102 to be individualized into molars, canines, incisors, and the like, respectively.
- the identified teeth may be assigned a tooth number according to the location in which the tooth is placed.
- the tooth number may be assigned based on a universal numbering system (Universal numbering system).
- the step of extracting the data (S120) is shown to be performed before the step (S130) of aligning the scan data, but is not necessarily limited to the order, and is performed before the step (S140) of adjusting the occlusal position. It is also possible to allow the maxillary scan data 101 and mandibular scan data 102 to be adjusted using the tooth area data when adjusting the occlusal position.
- the step of extracting the data (S120) may be performed simultaneously with the step of obtaining the scan data (S110).
- the tooth area data 300 may be divided, and then the tooth area data 300 is used in the step (S140) of adjusting the occlusal position. can do.
- the occlusal alignment method includes aligning scan data ( S130 ).
- the user may acquire the maxillary scan data 101 , the mandibular scan data 102 , and at least one occlusal scan data 103 and 104 for the inside of the patient's mouth.
- the occlusal scan data 103 and 104 may refer to data obtained by scanning the buccal surfaces of the maxilla and mandible in a bite position where the maxilla and the mandible are engaged with each other when the patient closes his/her mouth. there is.
- the occlusal scan data 103 and 104 may include a part of the tooth area data of the maxillary scan data 101 and a part of the tooth area data of the mandibular scan data 102 . Since the occlusal scan data 103 and 104 include a portion of the maxillary scan data 101 and the mandibular scan data 102, the scan data 100 is aligned through the occlusal scan data 103 and 104 to obtain the first alignment data. can create The maxillary scan data 101 , the mandibular scan data 102 , and the occlusal scan data 103 and 104 may be aligned to generate first alignment data.
- the alignment may be performed using all areas of the maxillary scan data 101 and the mandibular scan data 102 .
- the step of arranging the scan data ( S130 ) may include the tooth area data 300 of the maxillary scan data 101 , the tooth area data 300 of the gingival area data 200 and the mandibular scan data 102 , and the gingiva. Sorting may be performed using the area data 200 or the like.
- the overlapping portion between the maxillary scan data 101 and the occlusal scan data 103, 104 is matched, and the overlapping between the mandibular scan data 102 and the occlusal scan data 103, 104 is The parts can be matched.
- the maxillary scan data 101 , the mandibular scan data 102 , and the occlusal scan data 103 and 104 may be aligned at the same time.
- the generated first alignment data represents the inside of the patient's oral cavity, and the user may provide a treatment suitable for the patient through the first alignment data.
- the first alignment data is obtained by automatically and/or manually aligning the maxillary scan data 101, the mandibular scan data 102, and the occlusal scan data 103, 104 when the occlusal scan data 103, 104 is acquired.
- a plurality of occlusal scan data 103 and 104 used to generate the first alignment data may be acquired.
- the occlusal scan data 103 and 104 are different from the first occlusal scan data 103 obtained by scanning one side of the maxilla and the mandible in the occlusion state and the first occlusal scan data 103 in the occlusion state.
- the second occlusion scan data 104 obtained by scanning the other side of the maxilla and the mandible may be included. That is, the first alignment data may be generated using one or more occlusal scan data 103 and 104 .
- the maxillary scan data 101 and the mandibular scan data 102 are It can be more precisely aligned.
- more sophisticated first alignment data can be obtained, and the user can provide a more suitable treatment to the patient.
- the occlusal state of the patient may be changed when the occlusal scan data 103 and 104 are acquired.
- the first occlusal scan data ( 103) and alignment of the second occlusion scan data 104 are not uniformly performed, so there is a disadvantage in that optimized aligned data cannot be obtained.
- the occlusal alignment method according to the present invention includes a step (S140) of performing compensation alignment, adjusting the occlusal position.
- FIGS. 9 to 11 are for explaining the step of adjusting the occlusal position in the occlusal alignment method according to the present invention.
- 12 and 13 are for explaining the step of adjusting the occlusal position in the occlusal alignment method according to another embodiment of the present invention.
- the occlusal position is adjusted by moving at least one of the maxillary scan data 101 and the mandibular scan data 102 aligned in the first alignment data.
- adjusting the occlusal position may mean that the maxillary scan data 101 approaches the mandibular scan data 102 .
- adjusting the occlusal position may mean that the maxillary scan data 101 moves away from the mandibular scan data 102 .
- Adjusting the occlusal position may be the movement of the maxillary scan data 101 in a state where the mandibular scan data 102 is fixed.
- the mandibular scan data 102 is may be moving.
- the adjusting of the occlusal position ( S140 ) may be such that the maxillary scan data 101 and the mandibular scan data 102 appropriately move to each other to adjust the occlusal position.
- Adjusting the occlusal position includes generating at least one line from the extracted tooth area data (S141), selecting a line below a predetermined threshold (S142), and maxillary scan data based on the selected line Adjusting the distance between the mandibular scan data (S143), and reducing the threshold value includes the step of repeatedly performing the above step (S144).
- At least one line may be generated ( S141 ) from the tooth area data 300 extracted in the step of extracting the above-described data ( S120 ).
- the line is generated with reference to the tooth area 301 of the maxillary scan data 101 and the tooth area 302 of the mandibular scan data 102, and the maxillary scan data 101 and/or the mandibular scan data 102 . ) and/or an imaginary line connecting the faces.
- at least one point on the surface of the tooth areas 301 and 302 means only points formed on the occlusal surface among the tooth areas 301 and 302 of the maxillary scan data 101 and/or the mandibular scan data 102. It is not, and may refer to all points formed on the occlusal side, labial side ( ⁇ ), lingual side ( ⁇ ), and buccal side ( ⁇ ).
- the line may be generated from a nearest neighboring test or a Ray intersection test.
- the nearest neighbor test is at least one surface of the tooth area 302 of the mandibular scan data 102 that is the closest from at least one point of the surface of the tooth area 301 of the maxillary scan data 101 .
- method to find the point of Illustratively, the nearest neighbor search test may be performed by decomposing the space using spatial search algorithms and finding the nearest point in the decomposed space.
- the nearest neighbor search test is performed using the spatial search algorithm, it is possible to quickly find a point in a short distance and generate a line.
- the nearest neighbor search test is not limited to using a spatial search algorithm, and may be performed using various algorithms such as machine learning.
- five maxillary points P11 , P12 , P13 , P14 , and P15 may be generated in the maxillary tooth region 301 of the maxillary scan data 101 .
- the maxillary points P11 , P12 , P13 , P14 , and P15 may be generated based on mesh data constituting the tooth region 301 of the maxillary scan data 101 . More specifically, in mesh data constituting the tooth region 301 of the maxillary scan data 101, vertices of the mesh data may be generated as maxilla points P11, P12, P13, P14, and P15.
- a ray intersection test may be performed at each of the maxillary points P11, P12, P13, P14, and P15.
- the ray intersection test may generate rays from each of the maxillary points P11 , P12 , P13 , P14 , and P15 in the direction of a normal vector of each of the points P11 , P12 , P13 , P14 , and P15 .
- the light beam may strike the mandibular scan data 102 .
- At least some of the generated rays may reach and intersect the mandibular scan data 102 to generate mandibular points P21, P22, P23, P24, and P25.
- mandibular tooth region 302 of the mandibular scan data 102 five mandibular points P21 , P22 , P23 , P24 , and P25 intersecting the rays may be generated.
- the mandibular points P21, P22, P23, P24, and P25 may be formed in the tooth area 302 of the mandibular scan data 102, but may not necessarily be vertices of the mesh constituting the tooth area 302. there is.
- the mandibular points P21 , P22 , P23 , P24 , and P25 may be vertices of the mesh in the tooth region 302 , or may be a portion on the mesh plane in the tooth region 302 .
- the maxillary points P11, P12, P13, P14, P15 and the mandibular points P21, P22, P23, P24, P25 intersecting the A distance can be obtained.
- the distance between the points may be the shortest straight line distance.
- a first line 401 having a first distance l1 appears between the first maxillary point P11 and the first mandibular point P21, and the second maxillary point P12 and the second mandibular point
- a second line 402 having a second distance l2 appears between P22, and a third line having a third distance l3 between the third maxillary point P13 and the third mandible point P23.
- 403 appears
- a fourth line 404 having a fourth distance 14 appears between the fourth maxillary point P14 and the fourth mandibular point P24, and a fifth maxillary point P15 and a fifth
- a fifth line 405 having a fifth distance 15 may appear between the mandibular points P25 .
- the generation of five points in each of the maxillary tooth region 301 and the mandibular jaw region 302 is merely exemplary, and a ray cross-examination is performed at all points constituting the maxillary tooth region 301, and the generation At least some of the aligned lines may be used to perform compensating alignment.
- vertices of mesh data in the maxillary tooth region 301 are generated as maxillary points P11, P12, P13, P14, and P15, and the maxillary points P11, P12, P13, P14, and P15 are
- the mandibular points P21 , P22 , P23 , P24 , and P25 are generated by performing a ray crossover examination, the present invention is not limited thereto.
- the vertices of the mesh data in the mandibular tooth region 302 are generated as mandibular points P21, P22, P23, P24, and P25, and ray intersection inspection at the mandibular points P21, P22, P23, P24, and P25. may be performed to generate maxillary points P11, P12, P13, P14, and P15.
- a predetermined threshold may be selected ( S142 ). Exemplarily, lines having a threshold value of 0.5 mm or less may be selected.
- compensation alignment may refer to an Iteration Closest Point (ICP) alignment that minimizes the sum of distances between points included in selected lines in order to compensate for a patient's weak dental strength. Meanwhile, when the sum of the distances between points included in the selected lines is reduced, the distance between the maxillary scan data 101 and the mandibular scan data 102 may be adjusted.
- ICP Iteration Closest Point
- compensation alignment may be repeatedly performed by reducing the threshold value ( S144 ).
- compensation alignment is performed based on lines having a length of 0.5 mm or less as a first threshold value, then compensation alignment is performed based on lines having a length of 0.2 mm or less as a second threshold value.
- the positions of the maxillary scan data and the mandibular scan data may be moved so that the sum of the lengths of the selected lines is minimized.
- the length sum may mean the sum of absolute distances between the maxillary point and the mandibular point of the selected line.
- the sum l1 of the first length l1 of the first line 401 , the fourth length l4 of the fourth line 404 , and the fifth length l5 of the fifth line 405 may be moved so that +l4+l5) is minimized.
- the optimal compensation alignment has been performed through the corresponding threshold.
- data obtained by performing optimal compensation alignment is referred to as second alignment data, and the user may select at least one of the second alignment data and the first alignment data.
- the compensation alignment is performed using only points in the tooth region
- the ray intersection inspection is performed at the points in the gingival regions 201 and 202 and compensation alignment may be performed.
- a process of adjusting the occlusal position is shown when the maxillary scan data and the mandibular scan data are formed close to each other because the patient's dental strength is strong. It is generated with reference to the tooth area 301 of the maxillary scan data and the tooth area 302 of the mandibular scan data.
- five maxillary points (P11, P12, P13, P14, P15) are formed in the tooth area 301 of the maxillary scan data 101, and the maxillary points (P11, P12, P13, P14, P15)
- the ray cross examination is performed at , so that five mandibular points P21, P22, P23, P24, and P25 at which the rays strike the tooth region 302 of the mandibular scan data 102 may be formed.
- the first distance, the second distance, the third distance, the fourth distance, and the fifth distance are respectively between the maxillary points (P11, P12, P13, P14, P15) and the mandibular points (P21, P22, P23, P24, P25).
- the compensation alignment may mean adjusting the occlusal position by moving the maxillary scan data in a direction away from the mandibular scan data as a whole so that the sum of the distances between points included in the selected lines is reduced.
- lines having a distance equal to or less than a threshold value are illustrated as solid lines, and lines having a distance greater than a threshold value are illustrated by dotted lines. That is, the first line 401 and the fifth line 405 have a distance exceeding the threshold value, and thus are not used for compensation alignment, and the second line 402 , the third line 403 , and the fourth line Line 404 has a distance below the threshold and thus can be used for compensating alignment.
- the overlapping portion between the tooth area 301 of the maxillary scan data 101 and the tooth area 302 of the mandibular scan data 102 is reduced.
- additional alignment may be performed while decreasing the threshold value.
- the first line 401 , the second line 402 , and the fifth line 405 have a distance equal to or less than the new threshold value, so they can be used for compensation alignment, and the third line 403 . ), and the fourth line 404 may not be used for compensating alignment because it has a distance that exceeds the new threshold.
- the new threshold value may be set smaller than the previous threshold value so that fine compensation alignment is performed gradually.
- the above-described process may be equally applied even when the occlusion of the maxillary scan data 101 and the mandibular scan data 102 is misaligned. That is, even when the maxillary scan data 101 is partially shifted with respect to the mandibular scan data 102 , the maxillary scan data 101 and the mandibular scan data 102 are performed through the nearest neighbor search test and/or light beam as described above.
- a three-dimensional model having an appropriate occlusal position may be obtained through an alignment process based on the generation of virtual lines through the cross-examination and a selected line among the lines.
- the rays may strike a portion of the mandibular scan data 102 in a diagonal direction. Therefore, in this case, when the maxillary scan data 101 and the mandibular scan data 102 are ICP-aligned, compensation alignment is performed so that the scan data 101 and 102 are moved in the diagonal direction. As a result, the maxillary scan data 101 and Even when the occlusion of the mandibular scan data 102 is misaligned, the compensation alignment process as described above may be performed in the same manner.
- the user when acquiring the maxillary scan data 101 , the user also acquires cheek region data 501 other than the tooth region 301 in the process of scanning the buccal surface of the molar teeth.
- the cheek region data 502 , 503 other than the tooth region 302 may be acquired together. If the ball area data 501 , 502 , and 503 acquired together are not excluded when the compensation alignment is performed, data used for compensation alignment in the aforementioned ray intersection inspection may function. Accordingly, when the ball area data 501 , 502 , and 503 that are substantially unnecessary for occlusal position compensation act as the data underlying the compensation alignment, there is a possibility that rather sophisticated occlusal position compensation is hindered. Therefore, when performing compensation alignment according to the step S140 of adjusting the occlusal position, the cheek area data 501 , 502 , and 503 of the maxillary scan data 101 and the mandibular scan data 102 should not be used.
- adjusting the occlusal position ( S140 ) includes a predetermined number or more of vertices of the mesh constituting the tooth area 301 of the maxillary scan data 101 and the tooth area 302 of the mandibular scan data 102 . It may be done only in cases where When the points constituting the tooth regions 301 and 302 are insufficient, the occlusion may be misaligned if the step of adjusting the occlusal position ( S140 ) is performed. Accordingly, when the number of points forming the tooth regions 301 and 302 is small, the second alignment data according to the step S140 of adjusting the occlusal position may not be generated.
- data not extracted in the step of extracting data ( S120 ) may include tongue area data, soft tissue data, etc. in addition to the cheek area data 501 , 502 , and 503 described above. That is, in the data extraction step ( S120 ), only the tooth area 301 and 302 data and the gingival area 201 and 202 data of the maxillary scan data 101 and the mandibular scan data 102 may be extracted and used. .
- FIG. 14 is a detailed flowchart of the step of selecting at least one of the first alignment data and the second alignment data in the occlusal alignment method according to the present invention, and FIG. This is to explain the separation degree as an example.
- the occlusal alignment method according to the present invention may select at least one of the first alignment data and the second alignment data according to a predetermined criterion ( S150 ). More specifically, the occlusal alignment method according to the present invention enables selection of data capable of providing optimal treatment to a patient by performing more elaborate occlusal alignment among the first alignment data and the second alignment data.
- the separation degree of the second alignment data may be obtained ( S151 ).
- the separation degree may mean the sum of distances from at least one of the maxillary scan data 101 and the mandibular scan data 102 to the occlusal scan data 103 and 104 .
- the separation degree may be the sum of the first separation distance d1, the second separation distance d2, the third separation distance d3, and the fourth separation distance d4 as shown in FIG. 15 .
- the first separation distance d1 is the distance between the maxillary scan data 101 and the first occlusion scan data 103
- the second separation distance d2 is the distance between the mandibular scan data 102 and the first occlusion scan data 103
- the distance, the third separation distance d3 is the distance between the maxillary scan data 101 and the second occlusion scan data 104, and the fourth separation distance d4 is the mandibular scan data 102 and the second scan data 104.
- the separation degree may mean the sum of all separation distances (d1+d2+d3+d4).
- the separation distance can be obtained using the above-described cross-beam inspection
- the separation distance is the maxillary scan data 101 or the mandibular scan data 102 occlusal scan data (103, 104) may mean the length of a line formed between the one point and a point obtained by intersecting a ray.
- the process of obtaining the separation distance is the same as measuring the length of a line by performing a beam cross inspection between the maxillary scan data 101 and the mandibular scan data 102 .
- the separation degree may be a distance (shortest distance) from at least one of the maxillary scan data 101 and the mandibular scan data 102 to the occlusal scan data 103 and 104 .
- the separation degree may mean a volume between at least one of the maxillary scan data 101 and the mandibular scan data 102 and the occlusal scan data 103 and 104 . That is, the degree of separation may be any value indicating the degree of separation between at least one of the maxillary scan data 101 and the mandibular scan data 102 and the occlusal scan data.
- a degree of separation which is a distance between at least one of the maxillary scan data 101 and the mandibular scan data 102 , and the occlusal scan data 103 and 104 may be obtained.
- a degree of separation obtained from the first alignment data is called a first degree of separation
- a degree of separation obtained from the second alignment data is called a second degree of separation.
- the second degree of separation and the first degree of separation may be compared ( S152 ). In this case, it may be determined whether the second separation degree of the second alignment data is within a predetermined range. For example, it may be determined whether the second separation degree of the second alignment data is within a predetermined multiple range of the first separation degree of the first alignment data.
- the predetermined multiple range may be, for example, 1.5 to 2 times. That is, the step of comparing the second degree of separation with the first degree of separation may include determining a case in which the second degree of separation falls within a range of 2 times or less, specifically, 1.5 times or less, of the first degree of separation.
- the second separation degree falls within a predetermined multiple range of the first separation degree, it may be determined that a three-dimensional model having an optimal occlusal position is obtained while the second alignment data does not significantly distort the inside of the patient's oral cavity.
- the second separation degree does not fall within a predetermined multiple range of the first separation degree, it can be determined that a three-dimensional model distorting the inside of the patient's oral cavity has been obtained, and in this case, it is reasonable to use the first alignment data .
- the second alignment data may be selected ( S153 ), and otherwise, the first alignment data may be selected ( S154 ). Accordingly, by selecting alignment data having an optimal occlusal position within a range that does not distort the inside of the patient's oral cavity, there is an advantage in that the user can provide optimal treatment to the patient.
- the second alignment data different from the first alignment data is generated according to the compensation alignment, and the process of selecting more suitable alignment data by comparing the separation between the first alignment data and the second alignment data may operate according to the user's selection.
- the second alignment data is generated and the step of selecting any one of the first alignment data and the second alignment data is selectively performed.
- the generating of the first alignment data is essentially performed, and the generating of the second alignment data may be optionally performed by a user who wants to additionally compensate the first alignment data.
- an occlusal alignment device that implements the occlusal alignment method according to the present invention as an apparatus will be described.
- the content overlapping with the above-described occlusal alignment method will be briefly mentioned or omitted.
- 16 is a block diagram of an occlusal alignment device according to the present invention.
- the occlusal alignment device 1 includes a scan unit 11 , a region extraction unit 12 , a DB unit 13 , an alignment unit 14 , a compensation alignment unit 15 , and data It includes a selection unit 16 and a display unit 17 .
- a scan unit 11 the region extraction unit 12
- a DB unit 13 the region extraction unit 12
- an alignment unit 14 the alignment unit 14
- a compensation alignment unit 15 the compensation alignment unit 15
- data It includes a selection unit 16 and a display unit 17 .
- the scan unit 11 may acquire scan data by scanning the inside of the patient's oral cavity.
- the scan data includes maxillary scan data, mandibular scan data, and at least one occlusal scan data.
- the maxillary scan data and mandibular scan data have information on teeth, gingiva, and cheeks in the patient's oral cavity.
- the occlusal scan data has an area overlapping each of the maxillary scan data and the mandibular scan data in the patient's bite position, and the initial positions of the maxillary scan data and the mandibular scan data can be aligned through the occlusal scan data. there is.
- the scan data acquisition process of the scan unit 11 is the same as described above, and the scan unit 11 may be a 3D scanner.
- the region extractor 12 may extract tooth region data from the maxillary scan data and the mandibular scan data acquired by the scan data acquisition process of the scan unit 11 . Such a process may be performed through a pre-learned artificial intelligence algorithm.
- the artificial intelligence algorithm may be mounted in the DB unit 13 .
- the pre-learned artificial intelligence algorithm may learn the tooth learning data stored in the DB unit 13 in a deep learning manner and distinguish characteristics of the data representing the tooth.
- the region extractor 12 extracts tooth region data from scan data (maxillary scan data and mandibular scan data) to use the tooth region data when performing compensation alignment for adjusting the occlusal position.
- By performing compensatory alignment using the tooth area data it is possible to exclude ball area data, etc. that interfere with precise adjustment of the occlusal position, and there is an advantage in that the compensation alignment unit 15 can perform precise compensatory alignment.
- the region extractor 12 may extract not only the tooth region data but also the gingival region data. Accordingly, compensation alignment may be performed using the extracted tooth area data and gingival area data.
- the aligner 14 may generate the first alignment data by aligning the scan data acquired by the scan unit 11 .
- the aligner 14 may align the maxillary scan data, the mandibular scan data, and at least one occlusal scan data at the same time.
- two or more occlusal scan data can be used.
- the occlusal scan data includes first occlusal scan data obtained by scanning one side of the maxilla and mandible in an occlusion state, and scanning the other side of the maxilla and mandible at positions different from the first occlusal scan data in an occlusal state.
- the second occlusion scan data may be included.
- the maxillary scan data and the mandibular scan data may be more precisely aligned.
- the process of generating the first alignment data is the same as described above.
- the first alignment data generated by the alignment unit 14 represents the scanned interior of the patient's oral cavity, but adjustment of the occlusal position may be required according to the occlusal state of the patient. Accordingly, the occlusal position may be adjusted by moving at least one of the maxillary scan data and the mandibular scan data based on the first alignment data.
- the optimal occlusal position may be obtained by moving the maxillary scan data and the mandibular scan data to be formed closer to each other.
- the optimal occlusal position can be obtained by moving the maxillary scan data and the mandibular scan data to be formed away from each other.
- predetermined points on the maxillary scan data and the mandibular scan data may be selected based on the mesh constituting the tooth region data.
- At least some of the vertices of the mesh data constituting the tooth region of the maxillary scan data are determined as the maxillary point, and the part of the mandibular scan data that the light beam hits is determined as the mandibular point by performing a ray crossing inspection at the maxillary point.
- the length of the line connecting the points may be adjusted so that the sum of the distances is minimized. That is, in order to minimize the sum of the distances between the points, the maxillary scan data and/or the mandibular scan data may be moved so that the sum of the lengths of the selected lines is minimized.
- the length may be adjusted based on selected lines less than or equal to the threshold.
- the compensation alignment unit 15 may obtain an optimal occlusal position by repeatedly performing the above process while gradually decreasing the threshold value.
- the optimal occlusal position may mean a position at which the sum of distances between selected lines is minimized, and data having the optimal occlusal position is called second alignment data.
- the second alignment data may be different from the first alignment data. The process of performing compensation alignment to obtain the second alignment data is the same as described above.
- the data selection unit 16 may select at least one of the first alignment data and the second alignment data according to a predetermined criterion (within a predetermined multiple range) by comparing the separation between the first alignment data and the second alignment data.
- a predetermined criterion within a predetermined multiple range
- the concept of the separation degree is the same as described above, and when the second separation degree of the second alignment data is equal to or less than twice the first separation degree of the first alignment data (more specifically, 1.5 times or less), data selection Unit 16 may select the second alignment data as data to provide a treatment plan to the patient.
- the data selection unit 16 is used as data to provide a treatment plan to the patient. 1 Sort data can be selected.
- the user can provide high-quality treatment to the patient.
- the display unit 17 may be any device capable of visually displaying the process by which the occlusal alignment method according to the present invention is performed and the operations performed by the occlusal alignment device, and may include a monitor, a tablet screen, a beam projector, and the like. Display devices may be used.
- the present invention provides an occlusal alignment method and an occlusal alignment apparatus for performing compensatory alignment so that the maxilla and mandible of a patient have optimal occlusion.
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Abstract
Description
Claims (20)
- 상악 스캔 데이터 및 하악 스캔 데이터에서 적어도 하나 이상의 치아 영역의 데이터를 추출하는 단계; 및상기 치아 영역 데이터를 이용하여 상기 상악 스캔 데이터 및 상기 하악 스캔 데이터의 교합 위치를 조정하는 단계; 를 포함하는 것을 특징으로 하는 교합 정렬 방법.
- 청구항 1에 있어서,상기 데이터를 추출하는 단계는,상기 상악 스캔 데이터 및 상기 하악 스캔 데이터의 볼(buccal) 영역 데이터를 추출하지 않는 것을 특징으로 하는 교합 정렬 방법.
- 청구항 1에 있어서,상기 데이터를 추출하는 단계는,상기 상악 스캔 데이터 및 상기 하악 스캔 데이터의 상기 치아 영역과 치은 영역만을 추출하는 것을 특징으로 하는 교합 정렬 방법.
- 청구항 1에 있어서,상기 상악 스캔 데이터 및 하악 스캔 데이터는,교합 상태(bite position)에서 상악 및 하악을 스캔하여 생성된 적어도 1개의 교합 스캔 데이터에 의해 정렬되어 제1 정렬 데이터를 생성하는 것을 특징으로 하는 교합 정렬 방법.
- 청구항 4에 있어서,상기 교합 스캔 데이터는 복수개 획득되며,상기 제1 정렬 데이터는 복수개의 상기 교합 스캔 데이터, 상기 상악 스캔 데이터, 및 상기 하악 스캔 데이터가 동시에 정렬되어 생성되는 것을 특징으로 하는 교합 정렬 방법.
- 청구항 4에 있어서,상기 교합 위치를 조정하는 단계는,상기 치아 영역 데이터를 기초로, 상기 상악 스캔 데이터와 상기 하악 스캔 데이터 사이에 적어도 하나의 라인을 형성하고, 상기 라인의 길이에 기초하여 상기 상악 스캔 데이터와 상기 하악 스캔 데이터 간 거리를 조절하여 상기 제1 정렬 데이터와 상이한 제2 정렬 데이터를 생성하는 것을 특징으로 하는 교합 정렬 방법.
- 청구항 6에 있어서,상기 라인은,상기 상악 스캔 데이터 및 상기 하악 스캔 데이터 중 적어도 하나의 스캔 데이터의 치아 영역을 이루는 메쉬 데이터의 적어도 하나의 지점과,상기 지점과 최근접 이웃하는, 다른 스캔 데이터의 치아 영역을 이루는 메쉬 데이터의 적어도 하나의 지점을 연결하여 형성되는 것을 특징으로 하는 교합 정렬 방법.
- 청구항 6에 있어서,상기 라인은,상기 상악 스캔 데이터 및 상기 하악 스캔 데이터 중 적어도 하나의 스캔 데이터의 치아 영역을 이루는 메쉬 데이터의 적어도 하나의 지점과,상기 지점에서 생성된 광선이 다른 스캔 데이터의 치아 영역에 닿는 부분을 연결하여 형성되는 것을 특징으로 하는 교합 정렬 방법.
- 청구항 6에 있어서,상기 라인은 복수개 획득되며,상기 교합 위치를 조정하는 단계는,상기 상악 스캔 데이터와 상기 하악 스캔 데이터 간 거리를 조절하기 위해 소정 임계값 이하의 길이를 갖는 라인들을 선택하는 것을 특징으로 하는 교합 정렬 방법.
- 청구항 9에 있어서,상기 교합 위치를 조정하는 단계는,선택된 상기 라인들의 길이합이 최소가 되도록 상기 상악 스캔 데이터와 상기 하악 스캔 데이터의 거리를 조절하는 것을 특징으로 하는 교합 정렬 방법.
- 청구항 10에 있어서,상기 교합 위치를 조정하는 단계는,상기 임계값을 감소시켜 소정 횟수 반복적으로 수행되는 것을 특징으로 하는 교합 정렬 방법.
- 청구항 6에 있어서,소정 기준에 따라 상기 제1 정렬 데이터와 상기 제2 정렬 데이터 중 적어도 하나를 선택하는 단계; 를 더 포함하고,상기 소정 기준은,상기 제1 정렬 데이터의 상기 상악 스캔 데이터 및 상기 하악 스캔 데이터 중 적어도 하나로부터 상기 교합 스캔 데이터까지의 거리인 제1 이격도와,상기 제2 정렬 데이터의 상기 상악 스캔 데이터 및 상기 하악 스캔 데이터 중 적어도 하나로부터 상기 교합 스캔 데이터까지의 거리인 제2 이격도를 기초로 하는 것을 특징으로 하는 교합 정렬 방법.
- 청구항 12에 있어서,상기 선택하는 단계는,상기 제2 이격도가 상기 제1 이격도의 소정 배수범위 이내이면 상기 제2 정렬 데이터를 선택하는 것을 특징으로 하는 교합 정렬 방법.
- 환자의 구강 내부를 스캔하여 상악 스캔 데이터, 하악 스캔 데이터, 및 적어도 하나의 교합 스캔 데이터를 획득하는 스캔부;상기 스캔부로부터 획득한 스캔 데이터들로부터 치아 영역 데이터를 추출하는 영역 추출부; 및상기 치아 영역 데이터를 이용하여 상기 상악 스캔 데이터 및 상기 하악 스캔 데이터의 교합 위치를 조정하는 보상 정렬부; 를 포함하는 것을 특징으로 하는 교합 정렬 장치.
- 청구항 14에 있어서,상기 영역 추출부는,상기 상악 스캔 데이터 및 상기 하악 스캔 데이터의 볼 영역 데이터를 추출하지 않는 것을 특징으로 하는 교합 정렬 장치.
- 청구항 14에 있어서,상기 상악 스캔 데이터 및 하악 스캔 데이터는,교합 상태(bite position)에서 상악 및 하악을 스캔하여 생성된 적어도 1개의 교합 스캔 데이터에 의해 정렬되어 제1 정렬 데이터를 생성하는 것을 특징으로 하는 교합 정렬 장치.
- 청구항 16에 있어서,상기 보상 정렬부는,상기 치아 영역 데이터를 기초로, 상기 상악 스캔 데이터와 상기 하악 스캔 데이터 사이에 적어도 하나의 라인을 형성하고, 상기 라인의 길이에 기초하여 상기 상악 스캔 데이터와 상기 하악 스캔 데이터 간 거리를 조절하여 상기 제1 정렬 데이터와 상이한 제2 정렬 데이터를 생성하는 것을 특징으로 하는 교합 정렬 장치.
- 청구항 17에 있어서,상기 라인은,최근접 이웃탐색 검사 및 광선 교차 검사 중 선택되는 1종 이상의 방식을 이용하여 형성되는 것을 특징으로 하는 교합 정렬 장치.
- 청구항 17에 있어서,소정 기준에 따라 상기 제1 정렬 데이터와 상기 제2 정렬 데이터 중 적어도 하나를 선택하는 데이터 선택부; 를 더 포함하고,상기 소정 기준은,상기 제1 정렬 데이터의 상기 상악 데이터 및 상기 하악 데이터 중 적어도 하나로부터 상기 교합 스캔 데이터까지의 거리인 제1 이격도와,상기 제2 정렬 데이터의 상기 상악 데이터 및 상기 하악 데이터 중 적어도 하나로부터 상기 교합 스캔 데이터까지의 거리인 제2 이격도를 기초로 하는 것을 특징으로 하는 교합 정렬 장치.
- 청구항 19에 있어서,상기 데이터 선택부는,상기 제2 이격도가 상기 제1 이격도의 소정 배수범위 이내이면 상기 제2 정렬 데이터를 선택하는 것을 특징으로 하는 교합 정렬 장치.
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| US18/036,542 US12527655B2 (en) | 2020-11-13 | 2021-11-10 | Occlusion alignment method and occlusion alignment apparatus |
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| KR1020210010977A KR102502588B1 (ko) | 2020-11-13 | 2021-01-26 | 교합 정렬 방법 및 교합 정렬 장치 |
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Also Published As
| Publication number | Publication date |
|---|---|
| EP4245254A4 (en) | 2024-07-24 |
| US20240008966A1 (en) | 2024-01-11 |
| US12527655B2 (en) | 2026-01-20 |
| EP4245254A1 (en) | 2023-09-20 |
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