Method and apparatus for providing periodontal chart

Abstract

A method and an apparatus for providing a periodontal chart are disclosed. The method and apparatus for providing a periodontal chart may match CT data and scan data of a patient, segment an anatomical structure from the matched data, measure periodontal pocket information for each tooth from the matched data, and display the measured periodontal pocket information through a periodontal chart.

Description

Method for providing a periodontal chart and device therefor

[0001] The present invention relates to an image data processing technology, and more specifically, to a technology for diagnosing by analyzing image data.

[0002] Periodontal disease is an inflammatory disease caused by oral bacteria. It destroys the alveolar bone surrounding the teeth, leading to tooth loss, making early diagnosis and treatment crucial. Therefore, it's crucial to establish an accurate diagnosis to enhance patient understanding of periodontal disease and improve patient consent for treatment.

[0003] Periodontal disease occurs in various areas of each tooth, and even within the same oral cavity, the severity of the disease varies. Therefore, a method for recognizing this and assessing its prognosis is necessary. Measuring periodontal pocket depth and attachment loss is a common assessment. These measurements can be performed using a probe. The probe is fixed parallel to the tooth's long axis and inserted into the periodontal pocket. The tooth is then divided into buccal and lingual surfaces, with measurements taken at the distal, middle, and mesial areas of each surface. Therefore, periodontal pocket measurements are performed for each tooth across the entire dentition, covering the six locations mentioned above (three buccal and three lingual) and are an essential component of periodontal disease screening. Periodontal pocket measurement is not only a component of initial periodontal examinations but is also a frequent procedure during maintenance checkups. However, patients experience pain each time they measure periodontal pockets. Furthermore, measuring six locations on each tooth is cumbersome, and the measurement area becomes inaccurate as the field of view becomes obstructed toward the molars. Furthermore, measuring periodontal pockets requires a constant force, which is difficult to achieve each time. Furthermore, rounding off calculations with 1mm increments inevitably leads to errors. Furthermore, when measuring using two-dimensional images such as periapical radiographs or panoramic radiographs, measurement errors can be significant depending on the shooting angle.

[0004] According to one embodiment, the present invention proposes a periodontal chart providing method and device capable of easily, conveniently, and accurately measuring periodontal pocket information without causing pain to the patient and providing the measured periodontal pocket information through a periodontal chart.

[0005] A method for providing a periodontal chart according to one embodiment includes a step of aligning CT data and scan data of a patient with periodontal disease, a step of segmenting anatomical structures from the aligned data, a step of extracting reference points targeting tooth regions from the aligned data from which anatomical structures are segmented, a step of measuring periodontal pocket information for each tooth using the extracted reference points, and a step of displaying the measured periodontal pocket information through a periodontal chart.

[0006] The step of measuring periodontal pocket information for each tooth may include a step of measuring periodontal pocket depth (Probing Pocket Depth: PPD), a step of measuring gingival recession (Gingival Recession: GR), and a step of measuring clinical attachment loss (CAL) by calculating the sum of the periodontal pocket depth and gingival recession.

[0007] Periodontal pocket depth is the distance between the gingival line and the bone level on the tooth axis, gingival recession is the distance between the alveolar line and the gingival line on the tooth axis, and attachment loss is the distance between the alveolar line and the bone level on the tooth axis.

[0008] The reference points include the alveolar point and the gingival point, and one or more points having a depth value lower than a threshold value on the tooth axis are extracted, and if the point is close to the root direction, it can be extracted as an alveolar point, and if it is close to the crown direction, it can be extracted as a gingival point.

[0009] In the step of measuring periodontal pocket information for each tooth, the tooth is divided into four sections in the buccal, lingual, mesial, and distal directions, periodontal pocket information is measured for each of the four sections, and in the step of displaying the periodontal pocket information through a periodontal chart, the periodontal pocket information measured for each of the four sections of the tooth can be displayed in each section of the periodontal chart that matches each of the four sections of the tooth.

[0010] In the step of displaying through the periodontal chart, the buccal and lingual directions of the teeth are grouped, and the mesial and distal directions are grouped and provided on the periodontal chart. However, the 'periodontial chart of the buccal and lingual directions' and the 'periodontial chart of the mesial and distal directions' can be changed and displayed according to a user operation signal.

[0011] At the stage of displaying through a periodontal chart, the severity information of periodontitis can be distinguished according to the periodontal pocket depth value, and the periodontitis severity information can be distinguished and displayed on the periodontal chart as identifiable visual information.

[0012] At the stage of displaying through a periodontal chart, if the value displayed on the periodontal chart deviates from the preset standard dimension, visual information about the value itself can be displayed differently.

[0013] In the step of displaying through a periodontal chart, panoramic data can be generated from CT data after data alignment, and a periodontal chart can be displayed together with the generated panoramic data.

[0014] In the step of displaying through a periodontal chart, when a user operation signal is received targeting a predetermined area of ​​the periodontal chart, a tooth area matching the predetermined area of ​​the periodontal chart can be displayed as identifiable visual information on the panoramic data.

[0015] In the step of displaying a periodontal chart, when displaying a tooth area matching a predetermined area of ​​the periodontal chart on the panoramic data, the tooth area can be clipped and displayed after being processed in a state where it is rotated to the front so that it can be seen by the user.

[0016] At the stage of displaying through the periodontal chart, the furcation information for each tooth can be displayed on the periodontal chart.

[0017] The method for providing a periodontal chart may further include a step of overlapping the first matching data before the re-examination and the second matching data after the re-examination, or overlapping and displaying the periodontal chart before the re-examination and the periodontal chart after the re-examination, depending on whether the patient has re-examined.

[0018] A periodontal chart providing device according to another embodiment includes a data acquisition unit that acquires image data of a periodontal disease patient, a display unit that displays a screen, and a control unit that aligns CT data and scan data of the patient, segments anatomical structures from the aligned data, extracts reference points for tooth areas from the segmented anatomical structures, measures periodontal pocket information for each tooth using the extracted reference points, and displays the measured periodontal pocket information on a periodontal chart through the display unit.

[0019] The present invention can measure periodontal pocket information easily, simply, and accurately without causing pain to the patient, and can provide the measured periodontal pocket information through a periodontal chart.

[0020] The present invention measures periodontal pockets for each tooth using CT images and scan images, two data sets unaffected by shooting angle and posture, and provides a periodontal chart including periodontal pocket information for each tooth on panoramic data generated using the CT images. This allows patients to measure periodontal pockets without experiencing pain, allows measurement of all areas of each tooth (rather than just six areas (three buccal and three lingual)), and provides accurate measurements. Furthermore, because a periodontal chart can be generated and provided immediately after patient data is acquired, it can aid in the user's rapid diagnosis.

[0021] The present invention superimposes the matching data of the first and second visits, or superimposes and displays the periodontal charts of the first and second visits, thereby enabling a user to compare them and understand the change in the patient's oral condition.

[0022] The present invention can display periodontitis severity information in a user interface (UI) and separately display the location of the corresponding tooth. Furthermore, by linking with a patient management program using numbered teeth, periodontal pocket measurement values ​​for teeth with periodontitis can be entered and displayed on an electronic chart. Therefore, users can establish treatment plans for teeth with periodontitis.

[0023] Figure 1 is a drawing showing the configuration of a periodontal chart providing device according to one embodiment of the present invention;

[0024] Figure 2 is an example drawing of CT data and scan data according to one embodiment of the present invention;

[0025] FIG. 3 is a drawing showing a screen for aligning CT data and scan data according to an embodiment of the present invention;

[0026] FIG. 4 is a diagram illustrating a screen for segmenting anatomical structures from CT data according to an embodiment of the present invention;

[0027] FIG. 5 is a drawing showing a screen for dividing a structure from scan data according to an embodiment of the present invention;

[0028] FIG. 6 is a drawing showing a screen for measuring periodontal pocket information according to one embodiment of the present invention;

[0029] FIG. 7 is a diagram illustrating a screen for measuring attachment loss according to various embodiments of the present invention;

[0030] Figure 8 is a drawing showing a root canal point according to one embodiment of the present invention;

[0031] FIG. 9 is a diagram illustrating an example of generating panoramic data according to an embodiment of the present invention;

[0032] FIG. 10 is a drawing illustrating a periodontal chart provision screen according to one embodiment of the present invention;

[0033] FIG. 11 is a diagram illustrating a periodontal chart for an individual tooth according to one embodiment of the present invention;

[0034] FIG. 12 is a drawing showing a screen that visually distinguishes and displays a tooth area matching a predetermined area when a predetermined area is selected in a periodontal chart according to an embodiment of the present invention.

[0035] FIG. 13 is a drawing showing a screen displaying a cross-sectional image of a tooth and a three-dimensional image of a tooth according to an embodiment of the present invention.

[0036] FIG. 14 is a drawing showing a screen that displays images in superimposition according to an embodiment of the present invention.

[0037] FIG. 15 is a diagram illustrating a flow chart providing method according to one embodiment of the present invention.

[0038] 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.

[0039] 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.

[0040] 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.

[0041] FIG. 1 is a drawing illustrating the configuration of a periodontal chart providing device according to one embodiment of the present invention.

[0042] Referring to Figure 1, the periodontal chart provider (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 applied to other general image processing programs.

[0043] A periodontal chart providing 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).

[0044] The data acquisition unit (101) acquires image data of a periodontal disease 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.

[0045] 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.

[0046] 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 can include scan data, CT data, data obtained by matching two data, panoramic data generated from the matching data, etc.

[0047] The storage unit (102) stores various data, such as information required for the operation of the periodontal chart provider (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.

[0048] According to one embodiment, the control unit (103) aligns the patient's CT data and scan data acquired through the data acquisition unit (101). An example of data alignment will be described below with reference to FIG. 3.

[0049] The control unit (103) can segment anatomical structures from the matching data. An example of segmenting anatomical structures is described below with reference to FIGS. 4 and 5.

[0050] The control unit (103) can extract reference points for the tooth area from the aligned data in which the anatomical structure is segmented and measure periodontal pocket information for each tooth using the extracted reference points. The reference points may be the CEJ line, the gingival margin line, the bone level, the tooth axis, etc.

[0051] Periodontal pocket information for each tooth may include Probing Pocket Depth (PPD), Gingival Recession (GR), and Clinical Attachment Loss (CAL). Here, periodontal pocket depth is the distance between the gingival line and the bone level on the tooth axis. Gingival recession is the distance between the alveolar line and the gingival line on the tooth axis. Clinical Attachment Loss is the distance between the alveolar line and the bone level on the tooth axis. An example of measuring periodontal pocket information is described below with reference to FIGS. 6 and 7.

[0052] The control unit (103) can display the measured periodontal pocket information on a periodontal chart via the display unit (105). An example of the periodontal chart is described below with reference to FIGS. 10 to 12.

[0053] FIG. 2 is an example diagram of CT data and scan data according to one embodiment of the present invention.

[0054] Referring to FIGS. 1 and 2, the periodontal chart provider (100) acquires image data of a patient. The periodontal chart provider (100) can request and receive the patient's image data from an external device.

[0055] 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 to create a plaster model and then scanning the model.

[0056] FIG. 3 is a drawing illustrating a screen for aligning CT data and scan data according to one embodiment of the present invention.

[0057] Referring to FIGS. 1 and 3, the periodontal chart providing device (100) can align CT data (201) and scan data (202) of a patient having different coordinate information. If the patient is edentulous, the periodontal chart providing device (100) can create a matching point at a predetermined location (e.g., a resin marker) to align the two data (201, 202). In contrast, in the case of a partially edentulous patient with some teeth remaining, the periodontal chart providing device (100) can create a matching point at a characteristic point of the tooth or a predetermined location (e.g., a resin marker) to align the two data (201, 202). For example, the periodontal chart providing device (100) can manually align by selecting a 1-point or 3-point point (300) by a user operation signal. Reference numeral 301 in Fig. 3 is a screen illustrating the alignment process, and reference numeral 302 is a screen illustrating the result of the alignment. At this time, the data in which CT data (201) and scan data (202) are aligned is referred to as 'aligned data'.

[0058] FIG. 4 is a drawing illustrating a screen for segmenting an anatomical structure from CT data according to an embodiment of the present invention, and FIG. 5 is a drawing illustrating a screen for segmenting a structure from scan data according to an embodiment of the present invention.

[0059] Referring to FIGS. 1, 4, and 5, the periodontal chart providing device (100) can segment anatomical structures from the CT data (201) after matching the CT data (201) and the scan data (202). The periodontal chart providing device (100) can segment anatomical structures through an artificial neural network of artificial intelligence. For example, the periodontal chart providing device (100) can learn the structures of patients from CT data of previous patients, and then segment anatomical structures from new CT data using the learned model. The anatomical structures may be maxillary teeth (401), mandibular teeth (402), maxillary jawbone (403), mandibular jawbone (404), etc. The artificial intelligence learning can be performed through the operation of an artificial neural network, and the artificial neural network can include, but is not limited to, Conventional Neural Networks (CNN), Recurrent Neural Networks (RNN), Deep Belief Networks, Restricted Boltzman Machines, etc.

[0060] In this case, if the anatomical structure is a ‘teeth’, the periodontal chart provider (100) can assign a number to each tooth.

[0061] Likewise, the periodontal chart provider (100) can segment anatomical structures from the scan data (202) after matching the CT data (201) and the scan data (202). The anatomical structures may be an upper jaw gum (510), a lower jaw gum (520), an upper jaw crown (530), a lower jaw crown (540), etc.

[0062] The periodontal chart providing device (100) can generate a tooth segmented from CT data (201) in the form of a hexahedron on scan data (202). Subsequently, the periodontal chart providing device (100) can generate a cross-section (500) in the tooth axis direction within the hexahedron, and can generate an inflection point (502) between the tooth and the gum. Subsequently, the periodontal chart providing device (100) can segment the tooth crown (530, 540) and the gum (510, 520) of the scan data (202) by connecting the inflection points (502).

[0063] Here, if the anatomical structure is a 'teeth', the periodontal chart providing device (100) can perform numbering on each tooth, and the numbering can be displayed to the user later on the segmented panoramic data. For example, the periodontal chart providing device (100) can generate a numbering box by numbering each individual tooth based on the segmented tooth information from the CT data (201) and the scan data (202). The numbering box means an area expressed as a rectangular parallelepiped on the CT data (210) and the scan data (202), which are three-dimensional data, respectively, in the longest area in terms of the width and height for the segmented individual teeth.

[0064] FIG. 6 is a drawing illustrating a screen for measuring periodontal pocket information according to one embodiment of the present invention.

[0065] Referring to Fig. 6, through curvature analysis of the inflection point for the tooth area (600) of the aligned data, the places where the depth becomes deep (having a negative (-) value because they become sunken) (610) can be distinguished as the alveolar point (620) and the gingival point (630), respectively. Looking at the color map shown on the right side of Fig. 6, the point with the deepest depth can be confirmed in the area marked in dark red. In addition, the point that appears closer to the crown direction based on the tooth can be defined as the alveolar point (620), and the point that appears closer to the root direction can be defined as the gingival point (630).

[0066] In other words, the periodontal chart providing device (100) can extract one or more points on the tooth axis having a depth value lower than a threshold value, and if the point is close to the root direction, extract it as a cervical point, and if the point is close to the crown direction, extract it as a gingival point.

[0067] And, when the periodontal chart providing device (100) divides the tooth area (600) into cross sections parallel to the tooth axis, it can create multiple alveolar points and gingival points on each cross section.

[0068] The periodontal chart providing device (100) can create a periodontal line by connecting the periodontal points created in each cross-section, and can create a gingival line by connecting the gingival points created in each cross-section.

[0069] The alveolar line is the boundary between the anatomical crown and the anatomical root in the scan data, and the gingival line is the boundary between the clinical crown and the clinical root in the scan data.

[0070] The periodontal chart provider (100) can measure periodontal pocket depth (640) and gingival recession (650) values ​​using the alveolar line and gingival line. Furthermore, the periodontal chart provider (100) can measure attachment loss (660) values ​​using these two measurement values.

[0071] Periodontal pocket depth (640) refers to the distance between the gingival line and the bone level (670) on the tooth axis (680).

[0072] Gingival recession (650) refers to the distance between the alveolar line and the gingival line on the tooth axis (680).

[0073] Attachment loss (660) is the distance between the alveolar line and the bone level (670) on the tooth axis (680), and is a value calculated by adding the periodontal pocket depth (640) and gingival recession (650).

[0074] The periodontal chart providing device (100) can distinguish and display information on the severity of periodontitis according to the periodontal pocket depth (640). For example, the periodontal chart providing device (100) can distinguish mild periodontitis when the periodontal pocket depth (640) is about 3 to 4 mm, moderate periodontitis when it is about 5 to 6 mm, and severe periodontitis when it is about 7 mm or more. The periodontal chart providing device (100) can distinguish the severity information into identifiable visual information, for example, gradation, and display it on the periodontal chart.

[0075] FIG. 7 is a drawing illustrating a screen for measuring attachment loss according to various embodiments of the present invention.

[0076] Referring to Figure 7, if the gingival line is lower root-wise than the alveolar line, the gingival recession has a negative (-) value, if the gingival line and the alveolar line are the same, the gingival recession has a value of 0, and if the gingival line is higher coronally than the alveolar line, the gingival recession has a positive (+) value.

[0077] (a) is when the gingiva is swollen and the gingival recession is a negative (-) value, for example, about -3 mm, that is, when the distance between the gingival line and the gingival line on the tooth axis (680) has a negative (-) value. In this case, since the gums have gone beyond the gingival line, the periodontal chart provider (100) can diagnose the disease as gingival hyperplasia. In this case, when the periodontal pocket depth is 6 mm, the attachment loss is 6 mm + (-3 mm) = 3 mm.

[0078] (b) is the case where there is no gingival recession, gingival recession is 0 mm, periodontal pocket depth is 6 mm, and attachment loss is 6 mm + (0 mm) = 6 mm.

[0079] (c) is a case where the gingival recession is 3 mm, the gingival recession is 3 mm, the periodontal pocket depth is 6 mm, and the attachment loss is 6 mm + (+3 mm) = 9 mm.

[0080] FIG. 8 is a drawing illustrating a root canal point according to one embodiment of the present invention.

[0081] Referring to Fig. 8, the periodontal chart provider (100) can additionally provide furcation information to the periodontal chart when the tooth corresponds to a multi-rooted tooth. A multi-rooted tooth is a tooth that includes a portion where the root is divided, and may be, for example, a maxillary first premolar, a maxillary first molar, a maxillary second molar, a maxillary third molar, a mandibular first molar, a mandibular second molar, or a mandibular third molar.

[0082] The periodontal chart providing device (100) can designate the points to be masked in 1, 2, or 3 places when masking teeth in an axial cross-sectional image (800) of CT data for a segmented multi-rooted tooth as the positions at which the roots are separated, and can detect these as each root furcation point (810, 820, 830). At this time, the detected root furcation points (810, 820, 830) may be different for each root location. If the root furcation points (810, 820, 830) do not come into contact with the bone level, they can be indicated as reference numeral 830.

[0083] FIG. 9 is a diagram illustrating an example of generating panoramic data according to an embodiment of the present invention.

[0084] Referring to FIG. 1 and FIG. 9, the periodontal chart providing device (100) can generate three-dimensional panoramic data (900) using CT data.

[0085] Below, a method for generating 3D panoramic data (900) using CT data will be described.

[0086] First, the periodontal chart provider (100) acquires a maximal intensity projection (MIP) image of a scout image in an axial state to acquire a dental arch.

[0087] Next, the periodontal chart provider (100) selects the largest area from the acquired maximum intensity projection image.

[0088] Next, the periodontal chart provider (100) generates a bounding box for the separated tooth and obtains a dental arch for the tooth based on a line passing through the center of the bounding box. From the second molar or third molar to the temporomandibular joint (TMJ), the dental arch can be determined based on a line passing through the center of the maximum intensity projection image.

[0089] In cases where teeth are missing, the periodontal chart provider (100) can set dental arch reference points. When setting the bounding box of a separated tooth, the tooth in the empty area can be calculated based on the average axes of adjacent teeth if there are teeth on either side, thereby generating a bounding box and tooth profile. If there is no tooth at the rearmost position, the bounding box can be generated based on the anterior tooth axis, thereby generating a tooth profile.

[0090] Next, the periodontal chart provider (100) can create a dental arch for the teeth based on a line passing through the center of the bounding box.

[0091] The generated dental arch does not have an ideal arch shape because it is generated centered on the teeth. Accordingly, the periodontal chart provider (100) can correct the closed curve through a thinning algorithm and generate two-dimensional panoramic data from the corrected dental arch.

[0092] In order to generate 3D panoramic data (900), the thickness of the image must be given in the Z-axis direction from the generated dental arch (since a 2D panorama was generated). At this time, the thickness can be generated as a thickness that includes both the maxilla and mandible. That is, the periodontal chart providing device (100) can determine the thickness of the 3D panoramic data (900) by reflecting the thickness of the thickest jaw bone based on the generated dental arch.

[0093] FIG. 10 is a drawing illustrating a periodontal chart provision screen according to an embodiment of the present invention, and FIG. 11 is a drawing illustrating a periodontal chart for an individual tooth according to an embodiment of the present invention.

[0094] Referring to FIGS. 1, 10, and 11, the periodontal chart providing device (100) can provide a periodontal chart (1000) together with dental image data, for example, 3D panoramic data (900). The periodontal chart providing device (100) can measure gingival recession, periodontal pocket depth, and attachment loss values ​​on data obtained by aligning CT data and scan data based on a tooth axis, and then display the gingival recession, periodontal pocket depth, and attachment loss values ​​through the periodontal chart (1000).

[0095] The periodontal chart providing device (100) can display gingival recession, periodontal pocket depth, and attachment loss values ​​for each tooth in the form of a graph through the periodontal chart (1000). At this time, the periodontal chart may not be displayed for a lost tooth. This is indicated by an X in the drawing. As another example, a processed tooth shape can be inserted into the corresponding area for a lost tooth, and the periodontal chart values ​​can be estimated and displayed using this. Specifically, the periodontal chart providing device (100) can form a hexahedron that fits the shape of a processed tooth, and estimate periodontal chart values ​​measured based on the tooth axis in each area divided into four according to the axis of the processed tooth. The estimated values ​​here can be displayed differently from the measured values ​​for the actual tooth.

[0096] The periodontal chart providing device (100) can divide a predetermined tooth (910) in the shape of a hexahedron designated by numbering in 3D panoramic data (900), for example, tooth number 36 (mandibular left first molar) of FIG. 10, into four parts in the buccal (911), mesial (912), lingual (913) and distal (914) directions, and display periodontal pocket depth, gingival recession and attachment loss values ​​measured based on the tooth axis on each of the four divided areas on the periodontal chart (1000). For example, the periodontal chart provider (100) can display periodontal pocket depth, gingival recession, and attachment loss values ​​measured on the buccal surface (911), mesial surface (912), lingual surface (913), and distal surface (914) of a tooth (910) based on the tooth axis on the periodontal chart (1000). At this time, the average value of the four divided areas can be displayed separately.

[0097] In Fig. 11, the periodontal chart (1000) is divided into four areas and displayed as rectangular areas of the same size, but the periodontal chart providing device (100) may also display the areas by dividing them into the same size as the width of a hexahedron corresponding to the buccal surface (911), mesial surface (912), lingual surface (913), and distal surface (914) of the tooth (910).

[0098] The periodontal chart providing device (100) can group the buccal and lingual directions of teeth and group the mesial and distal directions to provide a periodontal chart. At this time, the periodontal chart providing device (100) can change and display the 'periodontial chart of the buccal and lingual directions' and the 'periodontial chart of the mesial and distal directions' according to a user operation signal for a user interface, for example, a toggle button.

[0099] Conventional periodontal charts required periodontal pocket information to be measured at three points each on the buccal and lingual surfaces, and these measurements had to be recorded individually on the periodontal chart. Therefore, the graphs of these three points on the buccal and lingual surfaces were linearly plotted.

[0100] However, the present invention measures periodontal pocket information in the axial direction for each surface corresponding to the buccal surface, lingual surface, mesial surface, and distal surface of the tooth, and displays the measurement values ​​for each surface on a periodontal chart, so the graph is displayed as a gentle curve.

[0101] When providing a periodontal chart (1000), the periodontal chart provider (100) can set reference dimensions for distinguishing the severity of periodontitis and display each area corresponding to the set reference dimensions as identifiable visual information. For example, as illustrated in FIG. 10, reference dimensions for mild periodontitis, moderate periodontitis, and severe periodontitis can be displayed on the periodontal chart using orange, pink, and blue gradients, respectively.

[0102] At this time, if the periodontal pocket information measurement values ​​are included within the visually distinct areas of the periodontal chart (e.g., orange, pink, and blue gradients in Figure 10), the user can visually recognize at a glance that there is a possibility of periodontitis.

[0103] It can be visually distinguished and displayed on the periodontal chart itself, but as another example, if the value displayed on the periodontal chart deviates from the preset standard dimensions, the value itself can be displayed with different visual information including color, thickness, size, shape, etc.

[0104] The periodontal chart providing device (100) can provide periodontal pocket information including gingival recession, periodontal pocket depth, and attachment loss measured based on the tooth axis as a graph, rather than displaying values ​​rounded to the nearest 1 mm. Accordingly, the user can make a more accurate diagnosis. The periodontal chart providing device (100) determines that a diagnosis is necessary because there is a high possibility that the gums have receded severely or the bone has dissolved severely if the gingival recession and periodontal pocket depth values ​​are above a specific value or the slope of the graph progresses gradually and then deviates from a predetermined reference angle. Accordingly, the periodontal chart providing device (100) can display identifiable visual information about the teeth in the corresponding area. For example, when receiving a user signal to hover the mouse over a predetermined tooth (910) in the shape of a hexahedron in the 3D panorama data (900), the periodontal chart providing device (100) can display identifiable visual information, such as a separate color, thickness, size, shape, etc. In Figure 10, it is indicated by a red hexahedron.

[0105] The periodontal chart (1000) can display furcation information for each tooth.

[0106] FIG. 12 is a drawing illustrating a screen that visually distinguishes and displays a tooth area matching a predetermined area when a predetermined area is selected in a periodontal chart according to one embodiment of the present invention.

[0107] Referring to FIGS. 1 and 12, the periodontal chart providing device (100) can display the corresponding areas on the periodontal chart as identifiable visual information when the standard dimensions for mild periodontitis, moderate periodontitis, and severe periodontitis are set by user operation. For example, in FIG. 10, periodontitis severity information can be displayed on the periodontal chart as orange, pink, and blue gradients. The visual information can include color, thickness, size, shape, etc.

[0108] When the periodontal chart providing device (100) receives a user manipulation signal (e.g., a mouse over signal) in a predetermined area (e.g., a black line in FIG. 12) (1210) of the periodontal chart (1000), the device can display a tooth area, e.g., a buccal surface (911), matching the predetermined area (1210) of the periodontal chart (1000) on the 3D panoramic data by distinguishing it as identifiable visual information.

[0109] As another example, when the periodontal chart provider (100) receives a user manipulation signal (e.g., a mouse over signal) in a predetermined area (e.g., a mesial surface) of a periodontal chart (1000), the device can clip the tooth area matching the predetermined area of ​​the periodontal chart (1000) on the 3D panoramic data so that the tooth area, e.g., the mesial surface (912), is visible, and then process the area so that it is rotated to the front so that it can be seen by the user, and then display the image.

[0110] FIG. 13 is a drawing illustrating a screen displaying a cross-sectional image of a tooth and a three-dimensional image of a tooth according to one embodiment of the present invention.

[0111] Referring to FIGS. 1 and 13, when a periodontal chart providing device (100) receives a user manipulation signal (e.g., a mouse double-click signal) for selecting a predetermined tooth from 3D panoramic data, it can provide a 3D tooth image (1320) for the numbering area of ​​the selected tooth together with a cross-sectional image (1310) as illustrated in FIG. 13. At this time, the cross-sectional image (1310) can be provided based on the tooth axis of the selected tooth.

[0112] FIG. 14 is a drawing illustrating a screen for displaying overlapping images according to one embodiment of the present invention.

[0113] Referring to FIGS. 1 and 14, the periodontal chart provider (100) can display the first matching data prior to the re-examination and the second matching data upon re-examination by superimposing them, depending on whether the patient has re-examined. The treatment data prior to the re-examination and the treatment data upon re-examination can be distinguished based on the date the data was acquired in the patient management program.

[0114] Whether or not a patient is re-examined can be determined by whether there are multiple (two or more) CT data and scan data for a specific patient from the patient management program.

[0115] When there are multiple CT data and scan data, two aligned data, i.e., first aligned data (1410) and second aligned data (1420), can be displayed by overlapping based on landmarks of the CT data, according to the user's selection.

[0116] Next, the periodontal chart providing device (100) can create 3D panoramic data by configuring one dental arch and display it in an overlapping manner as shown in FIG. 14.

[0117] Furthermore, the periodontal chart provider (100) can additionally generate a periodontal chart by calculating or adding values ​​measured through multiple surfaces (e.g., buccal surface, lingual surface, mesial surface, and distal surface) for individual teeth of the second matching data, similar to individual teeth of the first matching data.

[0118] The periodontal chart provider (100) can display the periodontal charts of the first and second visits in an overlapping manner, thereby facilitating comparison of the periodontal charts and making it easier to understand the patient's oral health status.

[0119] FIG. 15 is a diagram illustrating a flow chart providing method according to one embodiment of the present invention.

[0120] Referring to FIG. 1 and FIG. 15, the periodontal chart providing device (100) aligns the patient's CT data and scan data (S1510).

[0121] Next, the periodontal chart provider (100) segments anatomical structures from the matching data (S1520).

[0122] Next, the periodontal chart providing device (100) extracts reference points for the tooth area from the aligned data in which the anatomical structure is segmented and measures periodontal pocket information for each tooth using the extracted reference points (S1530). The periodontal chart providing device (100) can create a bounding box based on the tooth axis and measure the alveolar line, gingival line, and bone level in four divided areas within the bounding box. The reference points may be the alveolar line, gingival line, bone level, and tooth axis.

[0123] In the periodontal pocket information measurement step (S1530) for each tooth, the periodontal chart providing device (100) can measure the periodontal pocket depth, gingival recession, and attachment loss based on the tooth axis.

[0124] Next, the periodontal chart provider (100) displays the measured periodontal pocket information through a periodontal chart (S1540).

[0125] In the periodontal pocket information measurement step (S1530) for each tooth, the periodontal chart provision device (100) can divide the tooth into four sections in the buccal, lingual, mesial, and distal directions, and measure periodontal pocket information for each of the four sections. Then, in the periodontal chart display step (S1540), the periodontal pocket information measured for each of the four sections of the tooth can be displayed in each section of the periodontal chart that matches each of the four sections of the tooth.

[0126] In the periodontal chart display step (S1540), the periodontal chart providing device (100) can group the buccal and lingual directions of the teeth and group the mesial and distal directions and provide them on the periodontal chart. At this time, the periodontal chart providing device (100) can change and display the 'periodontial chart of the buccal and lingual directions' and the 'periodontial chart of the mesial and distal directions' according to a user operation signal.

[0127] In the periodontal chart display step (S1540), the periodontal chart providing device (100) can distinguish periodontitis severity information according to the periodontal pocket depth value and display the periodontitis severity information as identifiable visual information on the periodontal chart.

[0128] In the periodontal chart display step (S1540), the periodontal chart providing device (100) can generate panoramic data from CT data after data alignment and display a periodontal chart together with the generated panoramic data.

[0129] In the periodontal chart display step (S1540), when the periodontal chart providing device (100) receives a user manipulation signal targeting a predetermined area of ​​the periodontal chart, it can display a tooth area matching the predetermined area of ​​the periodontal chart on the panoramic data by distinguishing it as identifiable visual information. At this time, when the periodontal chart providing device (100) displays a tooth area matching the predetermined area of ​​the periodontal chart on the panoramic data, it can clip the tooth area, process it in a state where it is rotated to the front so that it can be seen by the user, and then display it.

[0130] In the periodontal chart display step (S1540), the periodontal chart providing device (100) can display the root furcation information for each tooth on the periodontal chart.

[0131] Furthermore, the periodontal chart provider (100) can display the first matching data before the re-examination and the second matching data of the re-examination by overlapping them, depending on whether the patient has re-examined.

[0132] Furthermore, the periodontal chart provider (100) can display the periodontal chart before the re-examination and the periodontal chart after the re-examination by overlapping them.

[0133] 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

1. In the periodontal chart providing method of the periodontal chart providing device, Step of aligning the patient's CT data and scan data; Step of segmenting anatomical structures from the aligned data; A step of extracting reference points for the tooth area from the aligned data in which the anatomical structure is segmented and measuring periodontal pocket information for each tooth using the extracted reference points; and A step of displaying the measured periodontal pocket information through a periodontal chart; A method for providing a periodontal chart, characterized by including:

2. In paragraph 1, the step of measuring periodontal pocket information for each tooth is Step of measuring the periodontal pocket depth (Probing Pocket Depth: PPD); A step for measuring gingival recession (GR); and A step of measuring clinical attachment loss (CAL) by calculating the sum of periodontal pocket depth and gingival recession; A method for providing a periodontal chart, characterized by including:

3. In paragraph 2, Periodontal pocket depth is the distance between the gingival line and the bone level on the tooth axis. Gingival recession is the distance between the alveolar line and the gingival line on the tooth axis. A method of providing a periodontal chart, wherein attachment loss is characterized by the distance between the alveolar line and the bone level on the tooth axis.

4. In paragraph 1, The above reference points include the alveolar point and the gingival point, A method for providing a periodontal chart, characterized in that one or more points having a depth value lower than a threshold value on the tooth axis are extracted, and if the point is close to the root direction, the point is extracted as a cervical point, and if the point is close to the crown direction, the point is extracted as a gingival point.

5. In paragraph 1, the step of measuring periodontal pocket information for each tooth is The tooth is divided into four sections in the buccal, lingual, mesial, and distal directions, and periodontal pocket information is measured for each of the four sections. The steps indicated by the periodontal chart are A method for providing a periodontal chart, characterized in that periodontal pocket information measured for each of the four divided regions of a tooth is displayed in each region of a periodontal chart matching each of the four divided regions of a tooth.

6. In paragraph 5, the step of indicating through a periodontal chart A method for providing a periodontal chart, wherein the buccal and lingual directions of teeth are grouped, and the mesial and distal directions are grouped and provided on a periodontal chart, and the 'periodontial chart of the buccal and lingual directions' and the 'periodontial chart of the mesial and distal directions' are changed and displayed according to a user operation signal.

7. In paragraph 1, the step of indicating through a periodontal chart A periodontal chart providing method characterized by distinguishing periodontitis severity information according to periodontal pocket depth value and displaying periodontitis severity information as identifiable visual information on a periodontal chart.

8. In paragraph 1, the step of indicating through a periodontal chart A method for providing a periodontal chart, characterized in that when a value displayed on a periodontal chart deviates from a preset standard dimension, visual information about the value itself is displayed in a different manner.

9. In paragraph 1, the step of indicating through a periodontal chart A method for providing a periodontal chart, characterized in that it generates panoramic data from CT data after data alignment and displays a periodontal chart together with the generated panoramic data.

10. In paragraph 1, the step of indicating through a periodontal chart A method for providing a periodontal chart, characterized in that when a user operation signal is received for a predetermined area of ​​a periodontal chart, a tooth area matching the predetermined area of ​​the periodontal chart is displayed on the panoramic data as identifiable visual information.

11. In paragraph 10, the step of displaying a periodontal chart A method for providing a periodontal chart, characterized in that when displaying a tooth area matching a predetermined area of ​​a periodontal chart on panoramic data, the tooth area is clipped, processed in a state where it is rotated to the front so that it can be seen by the user, and then displayed.

12. In paragraph 1, the step of indicating through a periodontal chart A method for providing a periodontal chart characterized by displaying furcation information for each tooth on a periodontal chart.

13. In paragraph 1, the method for providing a periodontal chart is Depending on whether the patient has re-examined, a step of overlapping the first matching data before re-examination and the second matching data after re-examination or overlapping and displaying the periodontal chart before re-examination and the periodontal chart after re-examination; A method for providing a periodontal chart, characterized in that it further includes:

14. Data acquisition unit for acquiring image data of a periodontal disease patient; a display section for displaying a screen; and A control unit that aligns a patient's CT data and scan data, segments anatomical structures from the aligned data, extracts reference points targeting tooth areas from the segmented aligned data, measures periodontal pocket information for each tooth using the extracted reference points, and displays the measured periodontal pocket information on a periodontal chart through a display unit; A periodontal chart providing device characterized by including:

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