Tooth reduction guide design method and apparatus thereof

Abstract

A tooth reduction guide design method and an apparatus therefor are disclosed. The tooth reduction guide design method and the apparatus therefor detect lesions by segmenting image data of a patient, classify cavities according to the locations of the detected lesions, then determine a tooth reduction library according to the types of cavities and prostheses, and can design a tooth reduction guide in accordance with the amount of tooth reduction by using the tooth reduction library.

Description

Tooth removal guide design method and device thereof

[0001] The present invention relates to an image data processing technology, and more particularly, to a technology for designing a prosthesis from image data of a lesioned tooth.

[0002] In dentistry, prosthesis refers to restoring the shape and function of a tooth by designing and fitting an artificial device to replace the missing portion of a tooth damaged by caries, trauma, or other causes. Fixed dental prosthetics include crowns, bridges, inlays, and onlays. A representative example is a crown, which is a prosthesis made of gold or ceramic to recreate the shape of the entire tooth when extensive damage has occurred to a single tooth. A bridge is a prosthesis that, when a tooth has been extracted, involves cutting down the teeth on either side of the tooth to support it and attaching an artificial tooth in the middle. Inlays and onlays are prosthetics that recreate a portion of the tooth and bond it to the tooth when the extent of the damage is limited.

[0003] For this type of dental treatment, teeth must be removed to a specific shape and the prosthesis to be fitted must be precisely designed. Typically, tooth removal is performed manually. After the tooth is removed, an impression is taken of the patient, and based on this, the prosthesis design process, which takes several days, begins. During this process, the patient must wear a temporary restoration. After several days, the designed permanent prosthesis is fitted over the removed area, completing the treatment.

[0004] Prosthodontic treatment involves tooth preparation for procedures such as crowns and bridges. Tooth preparation is a crucial step, enabling the placement of prosthetics, influencing the bond between the tooth and the prosthesis, and ensuring the prosthesis is used without loss or fracture. However, the condition and shape of the removed tooth are largely determined by the experience and skill of the practitioner. Therefore, when tooth preparation is performed by practitioners with limited experience or skill, the preparation time can be prolonged and the shape may be inadequate, leading to crowns or bridges becoming loose or easily fractured. Furthermore, unintentional excessive tooth preparation can expose the tooth pulp or increase the thickness of the prosthesis.

[0005] According to one embodiment, the present invention provides a tooth removal library suitable for the type of prosthesis, thereby enabling prediction of the amount of tooth removal and the shape of the final prosthesis, and proposes a tooth removal guide design method and device capable of designing a tooth removal guide.

[0006] A method for designing a tooth removal guide according to one embodiment includes a step of detecting a lesion by segmenting patient image data, a step of classifying a cavity according to the location of the detected lesion, a step of determining and providing a tooth removal library according to the type of cavity and prosthesis, and a step of designing a tooth removal guide according to the amount of tooth removal using the tooth removal library.

[0007] The step of detecting a lesion may include a step of detecting a lesion through segmentation in primarily acquired image data, a step of secondarily acquiring CT data including a lesioned tooth using a tooth formula designated by numbering after segmentation, and a step of detecting a lesion in the secondarily acquired CT data.

[0008] The method for designing a tooth removal guide may further include a step of aligning CT data and scan data of a patient, and a step of displaying a lesion segmented on the CT data on the scan data aligned with the CT data.

[0009] The step of classifying the cavity may include a step of assigning a plurality of different segmented areas to the crown of the lesion tooth image data depending on whether the lesion tooth is an anterior or posterior tooth, and a step of classifying the cavity grade depending on the location of the lesion within the plurality of segmented areas assigned to the anterior or posterior tooth.

[0010] The step of classifying the vortex may further include a step of classifying the vortex shape according to the location of the lesion after classifying the vortex grade.

[0011] In the step of determining and providing a tooth deletion library, the tooth deletion library can be determined to include an inner surface having a cavity shape in which tooth deletion is performed and an outer surface having a tooth shape corresponding to the tooth number of the lesioned tooth.

[0012] The method for designing a tooth deletion guide further includes a step of combining a tooth deletion library with a lesioned tooth, wherein when combined with the lesioned tooth, the lesioned tooth can be deleted based on the inner vortex shape of the tooth deletion library.

[0013] The combining step may include providing a tooth removal library and a lesion tooth, and combining the tooth removal library to the lesion tooth by a user operation signal via a manipulator that moves the tooth removal library in a predetermined direction.

[0014] The combining step may include a step of selecting feature points of the outer surface of the tooth deletion library and the lesion tooth, and a step of combining the tooth deletion library and the lesion tooth using the selected feature points.

[0015] The method for designing a tooth removal guide may further include a step of modifying a tooth removal library coupled to a lesion tooth.

[0016] The step of modifying the tooth deletion library may include the steps of providing a plurality of walls constituting an inner surface of the tooth deletion library, receiving a user manipulation signal for selecting a predetermined wall from among the plurality of walls, providing a manipulator in a direction matching the wall selected by the user manipulation signal, and moving the tooth deletion library according to the user manipulation signal for moving the manipulator in the predetermined direction.

[0017] The step of modifying the tooth deletion library may include a step of checking whether the margin of the tooth deletion library touches the occlusal surface of the opposing tooth of the lesioned tooth, and if it touches the occlusal surface of the opposing tooth of the lesioned tooth, a step of modifying the wall of the tooth deletion library using a manipulator so that it does not touch the occlusal surface of the opposing tooth of the lesioned tooth.

[0018] In the step of modifying the tooth deletion library, when modifying the tooth deletion library, certain segmentation data can be selectively displayed through the Show / Hide or Opacity adjustment interface.

[0019] At the stage of designing a tooth removal guide, the insertion direction of the tooth removal guide can be determined according to the insertion path of the inner surface of the tooth to which the tooth removal library is combined.

[0020] In the step of designing a tooth removal guide, the tooth removal guide can be designed to include a guide shape that protrudes outward to guide a tooth removal bur.

[0021] In the step of designing a tooth removal guide, the tooth removal guide can be designed to include a negative guide shape for guiding the tooth removal bur to remove the lesioned tooth in a transverse direction within the tooth removal guide.

[0022] The method for designing a tooth removal guide may further include a step of designing a final prosthesis that fits the tooth removal library when designing the tooth removal guide.

[0023] A tooth removal guide design device according to another embodiment includes a data acquisition unit that acquires image data of a patient, a display unit that displays a screen, a control unit that divides the image data of the patient to detect a lesion, classifies a cavity according to the location of the detected lesion, determines a tooth removal library according to the type of cavity and prosthesis and provides the determined tooth removal guide through the display unit, and designs a tooth removal guide according to the amount of tooth removal using the tooth removal library and provides the designed tooth removal guide through the display unit.

[0024] The present invention can detect a lesion by dividing the image data of a patient, classify a cavity based on the location of the detected lesion, determine a tooth removal library based on the type of cavity and prosthesis, and design a tooth removal guide based on the amount of tooth removal using the tooth removal library.

[0025] The present invention visualizes a lesion acquired based on CT data through alignment with the scan data, and provides a tooth deletion library according to the type of prosthesis selected by the user, thereby enabling prediction of the shape of the final prosthesis with a minimum amount of tooth deletion.

[0026] The present invention designs a tooth removal guide tailored to the amount of tooth removed, and simultaneously designs a final prosthesis to match it, enabling immediate attachment of the prosthesis after tooth removal. This not only reduces patient chair time, but also alleviates the hassle of designing a temporary prosthesis after tooth removal. Furthermore, the final prosthesis can be attached immediately after tooth removal, without the need for impression taking.

[0027] FIG. 1 is a drawing showing the configuration of a tooth removal guide design device according to one embodiment of the present invention;

[0028] Figure 2 is an example drawing of CT data and scan data according to one embodiment of the present invention;

[0029] FIG. 3 is a diagram illustrating a screen for segmenting anatomical structures from CT data according to an embodiment of the present invention;

[0030] FIG. 4 is a diagram illustrating a screen for segmenting anatomical structures from scan data according to an embodiment of the present invention;

[0031] FIG. 5 is a drawing showing a screen for aligning CT data and scan data according to an embodiment of the present invention;

[0032] FIG. 6 is a drawing showing a screen that displays a lesion detected from CT data in scan data aligned with CT data according to an embodiment of the present invention.

[0033] FIG. 7 is a diagram illustrating image data of a lesion tooth classified by a vortex grade according to an embodiment of the present invention.

[0034] FIG. 8 is a drawing showing a screen for dividing a crown when a lesioned tooth is an anterior tooth according to one embodiment of the present invention.

[0035] FIG. 9 is a drawing showing a screen for dividing a crown when a lesioned tooth is a molar according to one embodiment of the present invention.

[0036] FIG. 10 is a drawing showing an example of classifying a vortex shape according to an embodiment of the present invention;

[0037] FIG. 11 is a drawing showing a screen for selecting a type of prosthesis according to one embodiment of the present invention;

[0038] FIG. 12 is a drawing illustrating a tooth removal library according to an embodiment of the present invention;

[0039] FIG. 13 is a drawing showing a screen for combining a tooth deletion library to a lesion tooth according to an embodiment of the present invention;

[0040] FIG. 14 is a diagram illustrating lesion tooth image data including an inner wall of a tooth removal library according to an embodiment of the present invention;

[0041] FIG. 15 is a drawing showing a screen for modifying the amount of tooth removal by modifying the wall of a tooth removal library using a manipulator according to one embodiment of the present invention.

[0042] FIG. 16 is a diagram illustrating lesion tooth image data including margins of a tooth deletion library according to an embodiment of the present invention;

[0043] FIG. 17 is a drawing showing a screen for designing a tooth removal guide according to one embodiment of the present invention;

[0044] FIG. 18 is a drawing showing a screen for designing the inner and outer surfaces of a tooth removal guide according to one embodiment of the present invention.

[0045] FIG. 19 is a drawing showing a tooth removal guide including a round-shaped additional guide according to one embodiment of the present invention, and a tooth removal bur mounted on the tooth removal guide.

[0046] FIG. 20 is a drawing showing a screen for outputting a tooth removal guide and a final prosthesis according to one embodiment of the present invention.

[0047] FIG. 21 is a drawing illustrating a flow of a tooth removal guide design method according to one embodiment of the present invention.

[0048] The advantages and features of the present invention, and the methods for achieving them, will become clearer with reference to the embodiments described in detail below together with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below and may be implemented in various different forms. These embodiments are provided only to ensure that the disclosure of the present invention is complete and to fully inform those skilled in the art of the scope of the invention, and the present invention is defined only by the scope of the claims. Like reference numerals designate like elements throughout the specification.

[0049] In describing 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, such detailed description will be omitted. The terms described below are terms defined in consideration of functions in embodiments of the present invention, and these may vary depending on the intention or custom of the user or operator. Therefore, the definitions should be made based on the contents throughout this specification.

[0050] Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. However, the embodiments of the present invention exemplified 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 fully explain the present invention to those skilled in the art.

[0051] FIG. 1 is a drawing illustrating the configuration of a tooth removal guide design device according to one embodiment of the present invention.

[0052] Referring to Fig. 1, the tooth removal guide design device (100) is an electronic device capable of executing an image processing program. Electronic devices include personal computers (PCs), laptops, tablets, smartphones, and the like. Image processing programs include viewer programs, image editing programs, and the like. Furthermore, the device can be incorporated into other general image processing programs.

[0053] A tooth removal guide design device (100) according to one embodiment includes a data acquisition unit (101), a storage unit (102), a control unit (103), an input unit (104), and a display unit (105).

[0054] The data acquisition unit (101) acquires image data of the patient. The acquired image data may include CT data, scan data, etc. The data acquisition unit (101) may acquire the image data through a linked medical imaging device (not shown) or a separate database, etc. Examples of CT data and scan data are described below with reference to FIG. 2. The patient's image data may be a panoramic image, a periapical image, an intraoral photograph, etc.

[0055] Image data such as panoramic images, periapical images, and intraoral photographs can be used primarily to detect lesions, and image data such as CT images and scan data can be used secondarily to detect lesions and design tooth removal guides based on the image data.

[0056] The input unit (104) receives a user operation signal. At this time, the input unit (104) can receive a user operation signal for a user interface (UI, hereinafter referred to as 'UI') displayed on the screen.

[0057] The display unit (105) displays information on the screen. For example, the display unit (105) can display image data on the screen. The image data may include scan data, CT data, data obtained by matching two data, a panoramic image generated from the matching data, etc. An example of matching scan data and CT data will be described below with reference to FIG. 5.

[0058] The storage unit (102) stores various data, such as information required for performing the operation of the tooth removal guide design device (100) and information generated according to the operation. For example, the storage unit (102) stores patient image data, and can provide this to the control unit (103) upon user request.

[0059] The control unit (103) can segment anatomical structures from the patient's image data. An example of this will be described later with reference to FIGS. 3 and 4. At this time, the control unit (103) can segment the patient's image data to detect lesions. The lesions can be lesions occurring on teeth, for example, dental caries lesions.

[0060] The control unit (103) can classify cavities based on the location of the detected lesion. A cavity refers to a structure having a shape that matches the characteristics of the prosthesis to be restored after removing the lesioned area of ​​the tooth. Examples of cavity classification are described below with reference to FIGS. 7 to 10.

[0061] The control unit (103) can determine and provide a tooth deletion library according to the type of cavity and prosthesis. An embodiment of the tooth deletion library will be described later with reference to FIG. 12. The control unit (103) can combine the tooth deletion library with a lesioned tooth. An embodiment of combining with a lesioned tooth will be described later with reference to FIG. 13. The control unit (103) can modify the tooth deletion library combined with the lesioned tooth. An embodiment of modifying the tooth deletion library will be described later with reference to FIGS. 14 to 16.

[0062] Once the tooth deletion library is determined, the control unit (103) can design a tooth deletion guide. An example of a tooth deletion guide design will be described below with reference to FIGS. 17 to 19.

[0063] FIG. 2 is an example diagram of CT data and scan data according to one embodiment of the present invention.

[0064] Referring to FIGS. 1 and 2, the tooth removal guide design device (100) acquires image data of a patient. The tooth removal guide design device (100) can request and receive the patient's image data from an external device.

[0065] The patient's image data may be CT data (201) or scan data (202). The scan data (202) may be oral scan data obtained using an oral scanner. Alternatively, it may be data obtained by taking an impression using an impression material and then scanning the impression, or data obtained by pouring plaster on the impression, designing a plaster model, and then scanning the model.

[0066] Additionally, patient image data may include panoramic images, periapical images, intraoral photographs, etc.

[0067] FIG. 3 is a drawing illustrating a screen for segmenting an anatomical structure from CT data according to an embodiment of the present invention, and FIG. 4 is a drawing illustrating a screen for segmenting an anatomical structure from scan data according to an embodiment of the present invention.

[0068] Referring to FIGS. 1, 3, and 4, the tooth removal guide design device (100) can segment anatomical structures from CT data (201). At this time, the anatomical structures can be segmented through an artificial neural network of artificial intelligence. For example, the tooth removal guide design device (100) can learn the structures of a patient from CT data of previous patients, and then segment anatomical structures from newly acquired CT data using the learned model. The anatomical structures may be maxillary teeth (301), mandibular teeth (302), maxillary jawbone (303), mandibular jawbone (304), pulp within maxillary teeth (not shown), pulp within mandibular teeth (not shown), etc. The tooth removal guide design device (100) can also segment lesions, for example, dental caries lesions, from CT data (201). Artificial intelligence learning can be performed through the operation of artificial neural networks, which may include, but are not limited to, Conventional Neural Networks (CNN), Recurrent Neural Networks (RNN), Deep Belief Networks, and Restricted Boltzman Machines.

[0069] If the anatomical structure is a ‘teeth’, the tooth removal guide design device (100) can assign a numbering to each tooth.

[0070] The tooth removal guide design device (100) may primarily detect a lesion using a panoramic image, a periapical image, or an intraoral photograph taken before acquiring CT data (201). The lesion may be, for example, a dental caries lesion. The tooth removal guide design device (100) may acquire segmentation data by masking each tooth and crown in the panoramic image, periapical image, or intraoral photograph. Subsequently, the tooth removal guide design device (100) may acquire segmentation data by performing a separate masking operation on the lesion in the crown area. After constructing a DB through this process, the lesioned tooth can be detected from new patient data (panoramic image, periapical image, or intraoral photograph).

[0071] The tooth removal guide design device (100) can secondarily acquire CT data including the lesioned tooth using a tooth pattern designated by numbering after segmenting the lesion from the firstly acquired data (panoramic image, periapical image, or intraoral photograph). In this case, the tooth removal guide design device (100) can detect the lesion from the secondarily acquired CT data (201).

[0072] Meanwhile, the tooth removal guide design device (100) can segment anatomical structures based on scan data (202). The anatomical structures may be an upper jaw gum (410), a lower jaw gum (420), an upper jaw crown (430), a lower jaw crown (440), etc.

[0073] A tooth removal guide design device (100) can generate a tooth segmented from CT data (201) in a hexahedron shape on scan data (202). The tooth removal guide design device (100) can generate a cross-section (400) in the axial direction within the hexahedron to generate an inflection point (402) between a tooth and a gum. The tooth removal guide design device (100) can segment a tooth crown (430, 440) and a gum (410, 420) of scan data (202) by connecting the inflection points (402).

[0074] If the anatomical structure is a 'teeth', numbering may be reflected for each tooth, and the numbering may be displayed to the user in a later panoramic image. For example, the tooth deletion guide design device (100) may generate a numbering box by numbering each individual tooth based on tooth information segmented from CT data (201) and scan data (202). The numbering box refers to an area expressed as a rectangular parallelepiped on the CT data (210) and scan data (202), which are three-dimensional data, in the longest area in terms of width and height for the segmented individual teeth.

[0075] FIG. 5 is a drawing illustrating a screen for aligning CT data and scan data according to one embodiment of the present invention.

[0076] Referring to FIGS. 1 and 5, the tooth removal guide design device (100) can align CT data (201) and scan data (202). An example of aligning CT data and scan data will be described below with reference to FIG. 5.

[0077] The tooth removal guide design device (100) can align CT data (201) and scan data (202) of a patient with different coordinate information. In the case of a partial edentulous patient in which some teeth remain, the tooth removal guide design device (100) can create alignment points at characteristic points of the teeth and predetermined locations (e.g., resin markers) to perform alignment between the two data (201, 202). For example, the tooth removal guide design device (100) can perform manual alignment by selecting a 1-point or 3-point point (500) by a user operation signal. Reference numeral 501 of FIG. 5 is a screen illustrating the alignment process, and reference numeral 502 is a screen illustrating the result of the completed alignment. At this time, the data in which the CT data (201) and the scan data (202) are aligned is referred to as 'alignment data'.

[0078] FIG. 6 is a drawing illustrating a screen that displays a lesion detected in CT data according to one embodiment of the present invention in scan data aligned with the CT data.

[0079] Referring to FIGS. 1 and 6, the tooth removal guide design device (100) can generate a tooth segmented from the CT data in the form of a hexahedron on the scan data by aligning the CT data and the scan data. In addition, the tooth removal guide design device (100) can display a lesion (600) segmented from the CT data within a hexahedron (601) of the scan data.

[0080] The tooth deletion guide design device (100) can selectively display segmented upper and lower teeth, upper and lower jaw dimensions, upper and lower jaw bones, lesions, and segmented crowns and gums on scan data through a Show / Hide or Opacity control UI while the user is designing a tooth deletion guide. Accordingly, the user can modify the tooth deletion library while viewing multiple segmented data at the same time.

[0081] FIG. 7 is a diagram illustrating image data of a lesion tooth classified by vortex grade according to one embodiment of the present invention.

[0082] Referring to FIGS. 1 and 7, the tooth removal guide design device (100) determines whether the lesioned tooth is an anterior or posterior tooth based on the tooth type information in which the lesion is detected. Depending on whether the lesioned tooth is an anterior or posterior tooth, the crown may be divided differently in the scan data. For example, if the lesion is an anterior tooth, the crown may be divided into 15 equal parts in the scan data, and if the lesion is a posterior tooth, the crown may be divided into 27 equal parts in the scan data. An embodiment of this will be described later with reference to FIGS. 8 and 9.

[0083] The tooth removal guide design device (100) can classify the cavity grade according to whether the lesioned tooth is an anterior or posterior tooth and the location of the lesion. The classified cavity grades can include a class 1 cavity (701), a class 2 cavity (702), a class 3 cavity (703), a class 4 cavity (704), a class 5 cavity (705), and a class 6 cavity (706).

[0084] Class 1 cavity (701) is the target of all teeth, and is a cavity formed on the occlusal surface of the molars and the lingual surface of the anterior teeth.

[0085] The second-class vortex (702) is the target of the molar and is the adjacent vortex of the molar.

[0086] The third-grade cavities (703) are the anterior teeth and are adjacent cavities of the anterior teeth (excluding the incisal margin).

[0087] The 4th grade cavities (704) are the anterior teeth and are adjacent cavities (including the incisal edge) of the anterior teeth.

[0088] Grade 5 cavity (705) is a cavity formed within 1 / 3 of the gingiva on the buccal or lingual surface, and is applicable to all teeth.

[0089] The 6th grade cavity (706) is a cavity formed on the incisal edge of anterior teeth or the cusp of posterior teeth, and is the target of all teeth.

[0090] In the case of anterior teeth, they can be included in class 1 cavities (701), class 3 cavities (703), class 4 cavities (704), class 5 cavities (705), and class 6 cavities (706). In the case of posterior teeth, they can be included in class 1 cavities (701), class 2 cavities (702), class 5 cavities (705), and class 6 cavities (706). Anterior teeth can include upper and lower central incisors, upper and lower lateral incisors, and upper and lower canines. Posterior teeth can include upper and lower first premolars, upper and lower second premolars, upper and lower first molars, upper and lower second molars, and upper and lower third molars.

[0091] Classified vortex grade information can be automatically entered and displayed in patient management programs.

[0092] FIG. 8 is a drawing showing a screen for dividing a crown when a lesioned tooth is an anterior tooth according to one embodiment of the present invention, and FIG. 9 is a drawing showing a screen for dividing a crown when a lesioned tooth is a molar tooth according to one embodiment of the present invention.

[0093] When the lesioned tooth corresponds to an anterior tooth, the tooth removal guide design device (100) divides the crown into three parts in the cervical direction from the cross-sectional direction on the scan data as shown in FIG. 8, divides the central 1 / 3 and cervical 1 / 3 areas of the divided area into two parts in the buccal and lingual directions, and divides them into three parts from the mesial direction to the distal direction, thereby allocating a total of 15 divided areas.

[0094] If the lesioned tooth corresponds to a molar, the tooth removal guide design device (100) can divide the crown into three equal parts from the occlusal direction to the cervical direction on the scan data as shown in FIG. 9, and divide it into three equal parts from the mesial direction to the distal direction, thereby allocating a total of 27 divided regions. The allocated divided regions can be managed with different numbers.

[0095] FIG. 10 is a drawing illustrating an example of classifying a vortex shape according to one embodiment of the present invention.

[0096] Referring to FIGS. 1 and 10, when a lesion is included in the segmented area described above with reference to FIGS. 8 and 9, the cavity shape can be classified in detail even in a specific cavity grade. For example, as shown in FIG. 10, when a tooth in which a lesion (1000) is detected is a molar and is located on the mesial surface and the occlusal surface, the tooth removal guide design device (100) classifies the cavity grade as a 'molar 2nd class cavity' because the lesion (1000) is located at numbers 6 and 15. In addition, since the mesial and occlusal areas must be deleted, the cavity shape can be classified in detail as a 'MO (Mesial-Occlusal) cavity'.

[0097] The tooth removal guide design device (100) can provide the shape of a cavity classified in detail through a screen of the linked patient management program without the user having to input it separately.

[0098] FIG. 11 is a drawing illustrating a screen for selecting a type of prosthesis according to one embodiment of the present invention.

[0099] Referring to FIGS. 1 and 11, the amount of tooth removal and the method of tooth removal vary depending on the type of prosthesis. The tooth removal guide design device (100) provides a UI (1100) for selecting the type of prosthesis, so that the user can select the type of prosthesis to be used. The types of prosthesis include gold (1110), resin (1120), and ceramic (1130).

[0100] The tooth removal guide design device (100) can deactivate a certain type of prosthesis depending on the lesion type. For example, in the case of an anterior tooth with a lesion, 'gold (1101)' can be deactivated.

[0101] FIG. 12 is a diagram illustrating a tooth deletion library according to one embodiment of the present invention.

[0102] The tooth removal guide design device (100) can automatically determine and recommend a tooth removal library based on the tooth type number of the lesion tooth (e.g., tooth 26), the cavity shape (MO Cavity), and the type of prosthesis.

[0103] A tooth removal library can be provided based on theoretical values ​​for how much height and width of a lesioned tooth should be removed depending on the type of prosthesis.

[0104] The tooth deletion library may include an inner surface (1210) having the same shape as the inner surface of the final prosthesis, and an outer surface (1220) having a shape of a tooth formula corresponding to the tooth formula number of the lesioned tooth. For example, if the lesioned tooth (1200) is 'the maxillary left first molar, which is tooth number 26', the inner surface (1210) of the tooth deletion library may have a cavity shape in which tooth deletion is performed, and the outer surface (1220) of the tooth deletion library may have a general occlusal surface shape of the maxillary left first molar. Furthermore, the outer surface (1220) of the tooth deletion library may have an occlusal surface shape of the maxillary left first molar in accordance with the tooth deletion amount targeting a tooth area that fits the assigned segmentation area.

[0105] When the tooth deletion library is combined with a lesioned tooth (1200), the lesioned tooth (1200) can be deleted based on the cavity shape of the inner surface (1210) of the tooth deletion library. In addition, since the outer surface (1220) of the tooth deletion library may have a slightly different shape although the shape of the occlusal surface is almost similar for each person, designs having various occlusal surface shapes can be provided. The tooth deletion guide design device (100) can separately select the outer surface (1220) of the tooth deletion library by a user operation signal.

[0106] FIG. 13 is a drawing illustrating a screen for combining a tooth deletion library to a lesioned tooth according to one embodiment of the present invention.

[0107] Referring to FIGS. 1 and 13, when a tooth removal library (1310) is determined as illustrated in (a), the tooth removal guide design device (100) can provide the tooth removal library (1310) at a predetermined location, for example, at the top. Subsequently, the tooth removal guide design device (100) can couple the tooth removal library (1310) to the lesion tooth (1330) by a user operation signal via a manipulator (1320) that corrects the tooth removal library (1310) in a predetermined direction.

[0108] As another example, as illustrated in (b), the tooth removal guide design device (100) can select feature points (e.g., 3 points) of the outer surface (1220) of the tooth removal library (1310) and the lesion tooth (1330) in the scan data, and combine the tooth removal library and the lesion tooth (1330) using the selected feature points. For example, in the case of the upper left first molar and the MO Cavity of the Class 2 cavity, if the type of prosthesis is gold, the tooth removal guide design device (100) can combine the shape of the outer surface of the tooth removal library for the gold of the upper left first molar with the shape of the occlusal surface of the upper left first molar in the scan data. At this time, the feature points include a groove, a cusp, an angle, a marginal ridge, and a triangular ridge, which are expressed in the shape of the outer surface of the scan data and the tooth removal library. For the anterior teeth, the characteristic features may include the groove, cusp, marginal ridge, angle, and cingulum.

[0109] At this time, the tooth removal guide design device (100) can be combined manually by a user operation method, and after being combined automatically, can also be combined by a user operation by a fine modification method.

[0110] Through the tooth extraction library and tooth-to-tooth integration, patients can fully understand how their teeth will be treated before treatment. Doctors can predict the tooth extraction process in advance and thoroughly verify the accuracy of the results to ensure no errors.

[0111] FIG. 14 is a diagram illustrating lesion tooth image data including an inner wall of a tooth removal library according to one embodiment of the present invention.

[0112] Referring to FIGS. 1 and 14, when the tooth removal library is coupled to a lesioned tooth, the tooth removal guide design device (100) can determine whether there is contact between the pulp and the tooth removal library and whether the lesion can be completely removed, thereby providing a guidance message. When there is contact between the pulp and the tooth removal library, the tooth removal guide design device (100) can provide a guidance message, for example, "endodontic treatment is required."

[0113] As illustrated in FIG. 14, when the tooth removal library comes into contact with the pulp (1410) of the tooth, the user can reduce the amount of tooth removal and thus the contact with the pulp by modifying the engraved pulp wall (1424) on the inner surface of the tooth removal library.

[0114] The wall (1420) of the tooth extraction library may include a distal wall (1421), an axial wall (1422), a gingival wall (1423), a pulpal floor (1424), a facial wall (1425), and a lingual wall (1426). Additionally, if there is a lesion on the distal side, a mesial wall may be included.

[0115] FIG. 15 is a drawing showing a screen for modifying the amount of tooth removal by modifying the wall of a tooth removal library using a manipulator according to an embodiment of the present invention, and FIG. 16 is a drawing showing lesion tooth image data including a margin of a tooth removal library according to an embodiment of the present invention.

[0116] Referring to FIGS. 1, 15, and 16, a tooth removal guide design device (100) provides a manipulator (1500) for modifying a wall of a tooth removal library, and the wall of the tooth removal library can be modified by a user operation through the manipulator (1500). By modifying the wall of the tooth removal library through the manipulator (1500), the amount of tooth removal can be reduced, thereby reducing contact with the dental pulp.

[0117] As another example, if the tooth removal library is smaller than the lesion, the amount of tooth removal can be increased by modifying the wall of the tooth library using the manipulator (1500).

[0118] As another example, since the alignment between the CT data and the scan data may not be 100% accurate, the walls of the tooth removal library can be modified through the manipulator (1500).

[0119] Referring to Fig. 16, the tooth removal guide design device (100) can check whether the margin (1600) of the tooth removal library is in contact with the occlusal surface of the opposing tooth of the lesioned tooth. The margin (1600) is the outermost area where the lesioned tooth and the final prosthesis come into contact. The antagonist refers to the tooth on the opposite side of the lesioned tooth. If the lesioned tooth is the upper left first molar, the lower left first molar corresponds to this.

[0120] When the occlusal surface of the opposing tooth of the lesioned tooth and the margin (1600) are in contact, the tooth removal guide design device (100) can modify the wall of the tooth removal library through the manipulator (1500) so that it does not touch the occlusal surface of the opposing tooth of the lesioned tooth. At this time, the tooth removal guide design device (100) can provide the occlusal point and the distance from the opposing tooth as a color map. In the case of the margin of the inlay, since the thickness is not sufficiently secured, there is a risk of it breaking when the occlusal point is in contact.

[0121] Referring to FIG. 15, a manipulator (1500) may be generated when a user operation signal (e.g., a click) is received to select a predetermined wall of a tooth removal library. At this time, the wall selected by the user, e.g., a dimension wall (1424), may be highlighted and displayed, and the lesioned tooth may be made transparent to allow the internal dimension to be visible. Accordingly, since the user can view the lesion together, the user can check whether the lesion can be completely removed, whether it is close to the dimension, etc., and modify the wall of the tooth removal library.

[0122] When the mesial wall, distal wall, or axial wall is selected, a manipulator can be created in the mesiodistal direction of the affected tooth. When the gingival wall or pulp wall is selected, a manipulator can be created in the coronal and pulp directions of the affected tooth. When the buccal wall or lingual wall is selected, a manipulator can be created in the buccolingual direction of the affected tooth.

[0123] After selecting a wall, the user can drag the wall in the desired direction to adjust the movement size of the tooth removal library wall by the desired amount. To prevent excessive tooth removal, additional scales may be provided on the manipulator (1500). Figure 15 illustrates an example in which a tooth removal wall has been adjusted in the crown direction due to contact with the tooth.

[0124] The tooth deletion library modified by the user using the manipulator can be additionally stored in the storage unit.

[0125] FIG. 17 is a drawing illustrating a screen for designing a tooth removal guide according to one embodiment of the present invention.

[0126] Referring to FIGS. 1 and 17, a tooth removal guide design device (100) designs a tooth removal guide (1700) to be combined with lesion tooth image data (1701). The lesion tooth image data (1701) may be scan data (202 of FIG. 2).

[0127] At this time, the tooth removal guide design device (100) can determine the insertion direction of the tooth removal guide (1700) according to the insertion path of the inner surface of the tooth to which the tooth removal library is combined. The insertion direction of the tooth removal guide (1700) refers to the insertion direction when the tooth removal guide (1700) is actually fastened to the oral cavity of a patient.

[0128] For example, the tooth removal guide design device (100) can average the three-dimensional angles for each of the plurality of walls of the tooth removal library and determine the insertion direction of the tooth removal guide (1700) according to the averaged angle. If there are multiple lesions in the adjacent area of ​​the tooth, the tooth removal library can determine the insertion direction of the tooth removal guide (1700) according to the insertion path of the inner surface of the plurality of lesions combined.

[0129] The tooth removal guide design device (100) can determine the insertion direction of the tooth removal guide (1700) by considering the block out area of ​​the lesion tooth image data (1701). The tooth removal guide design device (100) generates the tooth removal guide (1700) by blocking out a predetermined area in the tooth shape of the lesion tooth image data (1701) based on a predetermined insertion direction, and the area generated in the tooth shape in the guide insertion direction is a 'block out area'. The tooth removal guide design device (100) can generate the tooth removal guide (1700) above the undercut according to the block out area. The lesion tooth image data (1701) may be scan data (202 of FIG. 2).

[0130] FIG. 18 is a drawing showing a screen for designing the inner and outer surfaces of a tooth removal guide according to one embodiment of the present invention.

[0131] Referring to FIGS. 1 and 18, the tooth removal guide design device (100) can design the shape of the cover portion of the tooth removal guide (1700). For example, the cover portion of the tooth removal guide (1700) can include at least one adjacent tooth on both sides of the diseased tooth. The tooth removal guide (1700) can be created over an undercut to fit the insertion path of the inner surface of the tooth to which the tooth removal library is combined. The thickness of the tooth removal guide (1700) can be such that it does not break.

[0132] Unlike the implant placement guide (which moves only in the longitudinal direction), the tooth removal guide (1700) must move the tooth removal bur (1900 of FIG. 19) in both the longitudinal and transverse directions. Accordingly, as illustrated in FIG. 18, the tooth removal guide (1700) may include an externally protruding guide shape (1720) to guide the tooth removal bur (1900 of FIG. 19) so that the tooth removal bur (1900 of FIG. 19) can enter the inside of the diseased tooth to a certain depth.

[0133] Meanwhile, as illustrated in FIG. 18, the tooth removal guide (1700) may include an engraved guide shape (1710) to guide the tooth removal bur (1900 of FIG. 19) to remove the lesioned tooth in a transverse direction within the tooth removal guide (1700).

[0134] When a tooth removal guide (1700) is mounted on a tooth removal bur (1900 of FIG. 19), it is guided to enter vertically while removing the first lesioned tooth by the externally protruding guide shape (1720). In addition, the tooth removal bur (1900 of FIG. 19) can be guided by the externally protruding guide shape (1720). The tooth removal guide (1700) can be provided in an open shape with a predetermined range, for example, 2 / 3, left in a circular shape so that the user can see it. The tooth removal guide (1700) in the externally protruding guide shape (1720) can serve to guide the tooth removal bur (1900 of FIG. 19) until it comes into contact with the engraved guide shape (1710) within the tooth removal guide (1700).

[0135] After the tooth removal bur (1900 of FIG. 19) enters along the externally protruding guide guide shape (1720) of the tooth removal guide (1700), the lesioned tooth can be removed in accordance with the engraved guide shape (1710) of the tooth removal guide (1700).

[0136] FIG. 19 is a drawing showing a tooth removal guide including an additional guide in a round shape according to one embodiment of the present invention, and a tooth removal bur mounted on the tooth removal guide.

[0137] Referring to FIGS. 1 and 19, since the cutting edge of the tooth removal burr (1900) can remove the tooth removal guide (1700), as shown in FIG. 19, the tooth removal burr (1900) may include an additional guide (1730) of a round shape (positive shape) that is easy to rotate. At this time, the tooth removal burr (1900) may be mounted on the additional guide (1730). In addition, a round-shaped engraved guide (1710 of FIG. 18) that fits the additional guide (1730) of a round shape (positive shape) that is easy to rotate may be created inside the tooth removal guide (1700).

[0138] FIG. 20 is a drawing illustrating a screen for outputting a tooth removal guide and a final prosthesis according to one embodiment of the present invention.

[0139] Referring to FIG. 1 and FIG. 20, the designed tooth removal guide (1700) and the final prosthesis (2000) can be 3D printed using a 3D printer or milled using a milling device.

[0140] The tooth deletion guide design device (100) can create a final prosthesis (2000) by deleting a tooth deletion library provided area for a prosthesis, adding or deleting an area on the outer surface using a brush, etc., and then modifying the area by assigning an additional occlusal point or modifying the occlusal point of the margin area by a user operation signal.

[0141] The tooth removal guide design device (100) designs a tooth removal guide according to the amount of tooth removal using a tooth removal library, and simultaneously designs a final prosthesis (2000) that matches the tooth removal library, so that the final prosthesis (2000) can be bonded immediately after the removal of the lesioned tooth. Accordingly, not only can the patient's chair time be reduced, but the hassle of having to design a temporary prosthesis after the patient's tooth is removed can be reduced. In addition, the final prosthesis (2000) can be bonded immediately after the tooth is removed without an impression taking process.

[0142] FIG. 21 is a drawing illustrating a flow of a tooth removal guide design method according to one embodiment of the present invention.

[0143] Referring to FIG. 1 and FIG. 21, the tooth removal guide design device (100) detects a lesion by segmenting the patient's image data (S2110).

[0144] In the lesion detection step (S2110), the tooth removal guide design device (100) can detect a lesion through segmentation from the primarily acquired image data. Subsequently, after segmentation, CT data including the lesioned tooth is secondarily acquired using the tooth pattern designated by numbering, and the lesion can be detected from the secondarily acquired CT data. At this time, the lesion may be a dental caries lesion.

[0145] Next, the tooth removal guide design device (100) classifies the cavity according to the location of the detected lesion (S2120).

[0146] In the cavity classification step (S2120), the tooth removal guide design device (100) can align the patient's CT data and scan data, and display the lesion segmented on the CT data on the scan data aligned with the CT data. Subsequently, the tooth removal guide design device (100) can classify the cavity grade according to whether the tooth having the lesion segmented on the CT data is an anterior tooth or a posterior tooth. For example, the tooth removal guide design device (100) can assign a plurality of different segmented areas to the crown of the scan data according to whether it is an anterior tooth or a posterior tooth, and classify the cavity grade according to the location of the lesion within the plurality of segmented areas assigned to each anterior tooth or posterior tooth. Furthermore, after classifying the cavity grade, the tooth removal guide design device (100) can classify the cavity shape according to the location of the lesion.

[0147] Next, the tooth removal guide design device (100) determines and provides a tooth removal library according to the type of cavity and prosthesis (S2130).

[0148] In the tooth deletion library provision step (S2130), the tooth deletion guide design device (100) can determine the tooth deletion library to include an inner surface having a cavity shape in which tooth deletion is performed and an outer surface having a tooth shape corresponding to the tooth shape number of the lesioned tooth.

[0149] A tooth removal guide design device (100) can combine a tooth removal library with a lesioned tooth. When combined with a lesioned tooth, the lesioned tooth can be removed based on the inner cavity shape of the tooth removal library.

[0150] In the bonding step, the tooth removal guide design device (100) provides a tooth removal library and a lesion tooth, and can bond the tooth removal library to the lesion tooth by a user operation signal through a manipulator that moves the tooth removal library in a predetermined direction.

[0151] In the combining step, the tooth deletion guide design device (100) can select the outer surface of the tooth deletion library and the feature points of the lesion tooth, and combine the tooth deletion library and the lesion tooth using the selected feature points.

[0152] The tooth removal guide design device (100) can modify a tooth removal library coupled to a lesioned tooth. For example, the tooth removal guide design device (100) can provide a plurality of walls constituting the inner surface of the tooth removal library. At this time, when the tooth removal guide design device (100) receives a user manipulation signal for selecting a predetermined wall from among the plurality of walls, the tooth removal guide design device (100) can provide a manipulator in a direction matching the wall selected by the user manipulation signal. Subsequently, the tooth removal guide design device (100) can move the tooth removal library according to the user manipulation signal for moving the manipulator in a predetermined direction.

[0153] In the tooth deletion library modification step, the tooth deletion guide design device (100) checks whether the margin of the tooth deletion library touches the occlusal surface of the opposing tooth of the lesioned tooth, and if it touches the occlusal surface of the opposing tooth of the lesioned tooth, the wall of the tooth deletion library can be modified using a manipulator so as not to touch the occlusal surface of the opposing tooth of the lesioned tooth.

[0154] In the tooth deletion library modification step, the tooth deletion guide design device (100) can selectively display predetermined segmentation data through a Show / Hide or Opacity adjustment interface when modifying the tooth deletion library.

[0155] Next, the tooth removal guide design device (100) designs a tooth removal guide according to the amount of tooth removal using the tooth removal library (S2140).

[0156] In the tooth removal guide design step (S2140), the tooth removal guide design device (100) can determine the insertion direction of the tooth removal guide according to the insertion path of the inner surface of the lesion tooth to which the tooth removal library is combined.

[0157] In the tooth removal guide design step (S2140), the tooth removal guide design device (100) can design the tooth removal guide to include a guide shape protruding outward to guide the tooth removal bur.

[0158] In the tooth removal guide design step (S2140), the tooth removal guide design device (100) can design the tooth removal guide to include a negative guide shape for guiding the tooth removal bur to remove the lesion tooth in a transverse direction inside the tooth removal guide.

[0159] Next, the tooth removal guide design device (100) can simultaneously design a final prosthesis that fits the tooth removal library when designing the tooth removal guide (S2150).

[0160] Next, the tooth removal guide design device (100) can output a tooth removal guide and a final prosthesis.

[0161] The present invention has been described above, focusing on specific embodiments thereof. Those skilled in the art will appreciate that the present invention can be implemented in modified forms without departing from its essential characteristics. Therefore, the disclosed embodiments should be considered illustrative rather than limiting. The scope of the present invention is set forth in the claims, not the foregoing description, and all differences within the scope equivalent thereto should be construed as being encompassed by the present invention.

Claims

In a tooth removal guide design method of a tooth removal guide design device, A step of segmenting the patient's image data to detect a lesion; A step of classifying cavities according to the location of the detected lesion; A step of determining and providing a tooth removal library according to the type of cavity and prosthesis; and Step of designing a tooth removal guide according to the amount of tooth removal using a tooth removal library; A method for designing a tooth removal guide, characterized in that it includes: In the first paragraph, the step of detecting a lesion is A step of detecting a lesion through segmentation from the initially acquired image data; A step of secondarily acquiring CT data including the lesioned tooth using the tooth numbering designated after segmentation; and A step of detecting lesions from secondarily acquired CT data; A method for designing a tooth removal guide, characterized in that it includes: In the first paragraph, the tooth removal guide design method Step of aligning the patient's CT data and scan data; and A step of displaying a segmented lesion on CT data in scan data aligned with the CT data; A method for designing a tooth removal guide, characterized in that it further includes. In the first paragraph, the step of classifying the vortex is A step of assigning a plurality of different segmentation zones to the crown of the lesion tooth image data depending on whether the lesion tooth is an anterior or posterior tooth; and A step of classifying the lesion grade according to the location of the lesion within multiple segmented areas assigned to each anterior or posterior tooth; A method for designing a tooth removal guide, characterized in that it includes: In the fourth paragraph, the step of classifying the vortex is After classifying the vortex grade, a step of classifying the vortex shape according to the location of the lesion; A method for designing a tooth removal guide, characterized in that it further includes. In the first paragraph, the step of determining and providing a tooth deletion library is A method for designing a tooth removal guide, characterized in that a tooth removal library is determined to include an inner surface having a cavity shape in which tooth removal is performed and an outer surface having a tooth shape corresponding to the tooth shape number of a lesioned tooth. In the first paragraph, the tooth removal guide design method further comprising a step of combining the tooth deletion library to the lesion tooth; A tooth removal guide design method characterized in that, when combined with a lesioned tooth, the lesioned tooth is removed based on the inner cavity shape of a tooth removal library. In the 7th paragraph, the combining step A step of providing a tooth deletion library and a lesion tooth; A step of combining a tooth removal library with a lesion tooth by a user operation signal through a manipulator that moves the tooth removal library in a predetermined direction; A method for designing a tooth removal guide, characterized in that it includes: In the 7th paragraph, the combining step A step of selecting the outer surface of the tooth deletion library and the feature points of the lesion tooth; and A step of combining the tooth deletion library and the lesioned tooth using the selected feature points; A method for designing a tooth removal guide, characterized in that it includes: In the 7th paragraph, the tooth removal guide design method A step of modifying a tooth deletion library coupled to a lesion tooth; A method for designing a tooth removal guide, characterized in that it further includes. In the 9th paragraph, the step of modifying the tooth deletion library is A step of providing a plurality of walls constituting the inner surface of a tooth removal library; A step of receiving a user operation signal for selecting a predetermined wall among a plurality of walls; A step of providing a manipulator in a direction matching a wall selected by a user operation signal; and A step of moving a tooth removal library according to a user operation signal for moving the manipulator in a predetermined direction; A method for designing a tooth removal guide, characterized in that it includes: In the 9th paragraph, the step of modifying the tooth deletion library is A step of checking whether the margin of the tooth removal library touches the occlusal surface of the opposing tooth of the lesioned tooth; and A step of modifying the wall of the tooth removal library using a manipulator so that it does not touch the occlusal surface of the opposing tooth of the lesioned tooth when it touches the occlusal surface of the opposing tooth of the lesioned tooth; A method for designing a tooth removal guide, characterized in that it includes: In the 9th paragraph, the step of modifying the tooth deletion library is A method for designing a tooth deletion guide, characterized in that when modifying a tooth deletion library, predetermined segmentation data is selectively displayed through a Show / Hide or Opacity adjustment interface. In the first paragraph, the step of designing a tooth removal guide is A method for designing a tooth removal guide, characterized in that the insertion direction of the tooth removal guide is determined according to the insertion path of the inner surface of the lesion tooth combined with the tooth removal library. In the first paragraph, the step of designing a tooth removal guide is A method for designing a tooth removal guide, characterized in that the tooth removal guide is designed to include an externally protruding guide shape for guiding a tooth removal bur. In the first paragraph, the step of designing a tooth removal guide is A method for designing a tooth removal guide, characterized in that the tooth removal guide is designed to include a negative guide shape for guiding the tooth removal bur to remove a lesioned tooth in a transverse direction within the tooth removal guide. In the first paragraph, the tooth removal guide design method Step of designing the final prosthesis to fit the tooth removal library; A method for designing a tooth removal guide, characterized in that it further includes. A data acquisition unit that acquires the patient's image data; a display section for displaying a screen; and A control unit that segments the patient's image data to detect a lesion, classifies a cavity based on the location of the detected lesion, determines a tooth removal library based on the cavity and prosthesis type and provides the library through the display unit, and designs a tooth removal guide based on the amount of tooth removal using the tooth removal library and provides the guide through the display unit; A tooth removal guide design device characterized by including:

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