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WO2017195820A1 - Dispositif d'assistance au diagnostic de la gingivite et système d'assistance au diagnostic de la gingivite - Google Patents

Dispositif d'assistance au diagnostic de la gingivite et système d'assistance au diagnostic de la gingivite Download PDF

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Publication number
WO2017195820A1
WO2017195820A1 PCT/JP2017/017678 JP2017017678W WO2017195820A1 WO 2017195820 A1 WO2017195820 A1 WO 2017195820A1 JP 2017017678 W JP2017017678 W JP 2017017678W WO 2017195820 A1 WO2017195820 A1 WO 2017195820A1
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WO
WIPO (PCT)
Prior art keywords
gingival
diagnosis
data
point cloud
gingiva
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/JP2017/017678
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English (en)
Japanese (ja)
Inventor
正樹 神原
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Individual
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Individual
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Filing date
Publication date
Priority claimed from JP2017031801A external-priority patent/JP6378793B2/ja
Application filed by Individual filed Critical Individual
Priority to KR1020187035703A priority Critical patent/KR20190004797A/ko
Priority to EP17796180.2A priority patent/EP3456240A4/fr
Priority to CN201780029030.7A priority patent/CN109561820A/zh
Priority to US16/099,909 priority patent/US20190150825A1/en
Publication of WO2017195820A1 publication Critical patent/WO2017195820A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B1/00—Instruments for performing medical examinations of the interior of cavities or tubes of the body by visual or photographical inspection, e.g. endoscopes; Illuminating arrangements therefor
    • A61B1/04—Instruments for performing medical examinations of the interior of cavities or tubes of the body by visual or photographical inspection, e.g. endoscopes; Illuminating arrangements therefor combined with photographic or television appliances
    • A61B1/045—Control thereof
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B1/00—Instruments for performing medical examinations of the interior of cavities or tubes of the body by visual or photographical inspection, e.g. endoscopes; Illuminating arrangements therefor
    • A61B1/24—Instruments for performing medical examinations of the interior of cavities or tubes of the body by visual or photographical inspection, e.g. endoscopes; Illuminating arrangements therefor for the mouth, i.e. stomatoscopes, e.g. with tongue depressors; Instruments for opening or keeping open the mouth

Definitions

  • the present invention relates to a gingival diagnosis support apparatus and a gingival diagnosis support system that support gingival diagnosis by a dentist.
  • an object of the present invention is to provide a gingival diagnosis support apparatus and a gingival diagnosis support system that support objective gingival diagnosis by a dentist.
  • a gingival diagnosis support apparatus is suitable for a gingival diagnosis, a cross-sectional data extraction unit that extracts cross-sectional data in the depth direction of a gingival margin from three-dimensional point cloud data on the front surface of the oral cavity, and And a gingival diagnosis data generation unit that generates gingival diagnosis data by processing into a form.
  • the gingival diagnosis data generation unit may generate a two-dimensional graph having the first axis in the left-right direction of the front of the oral cavity and the second axis in the depth direction as gingival diagnosis data.
  • the gingival diagnostic data generation unit may generate a two-dimensional graph having the first axis in the vertical direction of the front of the oral cavity and the second axis in the depth direction as gingival diagnostic data.
  • a gingival diagnosis support apparatus includes a contour extraction unit that extracts a contour of a gingival margin from a front photographic image of teeth and gingiva, and generates contour point cloud data, and contour point cloud data
  • a curve approximation unit that derives an approximate curve by performing function fitting on the point cloud data at the boundary between teeth and gingiva, and data for gingival diagnosis by overlaying the approximate curve on the point cloud data at the boundary between teeth and gingiva
  • a gingival diagnosis data generating unit includes a contour extraction unit that extracts a contour of a gingival margin from a front photographic image of teeth and gingiva, and generates contour point cloud data, and contour point cloud data
  • a curve approximation unit that derives an approximate curve by performing function fitting on the point cloud data at the boundary between teeth and gingiva, and data for gingival diagnosis by overlaying the approximate curve on the point cloud data at the boundary between teeth and gingiva
  • a gingival diagnosis data generating unit includes a contour extraction unit that extracts a contour of a ging
  • the gingival diagnosis support apparatus may further include a correlation calculation unit that calculates an index indicating the degree of correlation between the point cloud data at the boundary between the tooth and the gingiva and the approximate curve.
  • a gingival diagnosis support system includes the above gingival diagnosis support apparatus, an imaging apparatus that generates original image data to be processed by the gingival diagnosis support apparatus, and gingival diagnosis data generated by the gingival diagnosis support apparatus. And a display device for displaying.
  • the gingival diagnosis data is generated from the three-dimensional point cloud data of the front of the patient's oral cavity or the front photographic image of the teeth and gingiva, and the dentist can perform gingival diagnosis by referring to the gingival diagnosis data.
  • the gingival diagnosis data can be stored as digital data to track the aging of the patient's gingiva, and the quality of preventive diagnosis can be improved.
  • Configuration diagram of a gingival diagnosis support system The figure which shows the two-dimensional image of the oral cavity front which concerns on an example The figure which shows the three-dimensional point cloud data of the oral cavity front corresponding to FIG. 2A The figure which shows an example of the data for gingival diagnosis obtained from the three-dimensional point cloud data of FIG. 2B The figure which shows an example of the data for gingival diagnosis obtained from the two-dimensional point cloud data of FIG. 2B Configuration diagram of a gingival diagnosis support system according to a second embodiment The figure which shows the front photographic image of the tooth and gingiva which concern on an example The figure which shows the outline point cloud data obtained from the photographic image of FIG.
  • FIG. 4A The figure which shows the data for gingival diagnosis which overlapped the approximate curve on the point cloud data of the boundary of the tooth and gingiva in FIG. 4B
  • FIG. 5A The figure which shows the data for gingival diagnosis which overlaid the approximate curve on the point cloud data of the boundary of the tooth and gingiva in FIG. 5B
  • FIG. 6A Furthermore, the figure which shows the front photographic image of the tooth and gingiva concerning another example
  • FIG. 6A The figure which shows the data for gingival diagnosis which overlaid the approximate curve on the point cloud data of the boundary of the tooth and gingiva in FIG. 6B
  • FIG. 1 is a configuration diagram of a gingival diagnosis support system according to the first embodiment.
  • the gingival diagnosis support system 100A according to the present embodiment includes an imaging device 10A, a gingival diagnosis support device 20A, and a display device 30.
  • the imaging device 10A is a device that generates three-dimensional point cloud data on the surface of the subject.
  • a three-dimensional measurement device using a phase shift method can be used as the imaging device 10A.
  • the imaging apparatus 10 ⁇ / b> A includes a projector 11, a camera 12, and an image processor 13.
  • Projector 11 projects sinusoidal stripe pattern light onto the subject surface while shifting the phase.
  • the camera 12 captures reflected light from the subject surface and generates a captured image.
  • the image processor 13 analyzes the image captured by shifting the phase of the fringe pattern light, and acquires the three-dimensional shape (three-dimensional point cloud data) of the subject surface from the phase difference. According to such a phase shift method, three-dimensional measurement with an accuracy of about several tens of ⁇ m in the depth direction is possible in a relatively short time.
  • the imaging apparatus 10A can use a spatial code method, a light cutting method, or the like in addition to the phase shift method.
  • three-dimensional measurement based on triangulation may be performed using the camera 12 as a stereo camera.
  • the imaging device 10A is used to acquire three-dimensional point cloud data of the patient's oral front.
  • FIG. 2A shows an example of a two-dimensional image of the front of the oral cavity imaged by the imaging device 10A.
  • FIG. 2B shows three-dimensional point cloud data of the front surface of the oral cavity corresponding to FIG. 2A.
  • the imaging device 10 ⁇ / b> A allows the front of the oral cavity in the range of 157 mm in the left-right direction (X range), 102 mm in the vertical direction (Y range), and 142.6 mm in the depth direction (Z range).
  • Three-dimensional point cloud data is acquired.
  • the gingival diagnosis support apparatus 20A receives the three-dimensional point cloud data of the front surface of the oral cavity from the imaging apparatus 10A, processes the three-dimensional point cloud data, and assists gingival diagnosis by the dentist. It is a device that generates business data.
  • the gingival diagnosis support apparatus 20A can be configured by a general-purpose computer such as a PC (Personal Computer) or a server device, for example.
  • the gingival diagnosis support apparatus 20A can also be realized as SaaS (Software as a Service) on the cloud.
  • the imaging device 10A, the gingival diagnosis support device 20A, and the display device 30 are connected to each other via a network such as the Internet.
  • the gingival diagnosis support apparatus 20A includes a cross-section data extraction unit 21 and a gingival diagnosis data generation unit 25.
  • the cross-section data extraction unit 21 and the gingival diagnosis data generation unit 25 can be realized by software, hardware, or a combination thereof.
  • the cross-section data extraction unit 21 extracts cross-section data in the depth direction of the gingival margin from the three-dimensional point cloud data in front of the oral cavity. That is, the cross-section data extraction unit 21 extracts point group data on the XZ plane at an arbitrary Y range position and / or point group data on the YZ plane at an arbitrary X range position in the three-dimensional point group data on the front surface of the oral cavity.
  • the gingival diagnosis data generation unit 25 processes the depth direction cross-sectional data of the gingival margin into a format suitable for gingival diagnosis, and generates gingival diagnosis data.
  • the gingival diagnosis data generation unit 25 uses the two-dimensional graph with the horizontal axis of the oral cavity front as the horizontal axis and the depth direction as the vertical axis and / or the vertical direction of the oral cavity as the horizontal axis and depth direction as the gingival diagnosis data.
  • a two-dimensional graph with a vertical axis is generated.
  • the gingival diagnostic data in FIG. 2C is a two-dimensional graph with the horizontal axis of the front of the oral cavity as the horizontal axis and the vertical axis as the depth direction, and corresponds to point group data on the XZ plane in the line L1 shown in FIG. 2A.
  • the line L1 is a line indicating an arbitrary Y range position in the three-dimensional point cloud data in front of the oral cavity.
  • 2D is a two-dimensional graph in which the vertical direction of the front of the oral cavity is the horizontal axis and the depth direction is the vertical axis, and corresponds to the point group data on the YZ plane in the line L2 shown in FIG.
  • the portion protruding forward in the two-dimensional image of the front surface of the oral cavity in FIG. 2A is represented by a large vertical axis value in the two-dimensional graphs of FIGS. 2C and 2D. That is, in the two-dimensional graph, swelling at the gingival margin is expressed by a large vertical axis value.
  • the display device 30 is a device that displays gingival diagnosis data generated by the gingival diagnosis support apparatus 20A.
  • the display device 30 displays the two-dimensional image of the front of the oral cavity in FIG. 2A and the gingival diagnosis data in FIGS. 2C and / or 2D side by side.
  • the dentist can objectively determine the swelling degree of the gingival margin by looking at these images displayed on the display device 30.
  • FIG. 3 is a configuration diagram of a gingival diagnosis support system according to the second embodiment.
  • the gingival diagnosis support system 100B according to the present embodiment includes an imaging device 10B, a gingival diagnosis support device 20B, and a display device 30.
  • the imaging device 10B is a device that captures a still image of a subject.
  • a general digital still camera can be used as the imaging device 10B.
  • the imaging device 10B is used to acquire front photographic images of the patient's teeth and gingiva.
  • 4A, 5A and 6A show various examples of frontal photographic images of teeth and gums.
  • the photographic image captured by the imaging device 10B may be either a color or a grace case.
  • the gingival diagnosis support apparatus 20B receives the three-dimensional point cloud data of the front surface of the oral cavity from the imaging apparatus 10B, processes the three-dimensional point cloud data, and assists the gingival diagnosis by the dentist. It is a device that generates business data.
  • the gingival diagnosis support apparatus 20B can be configured by a general-purpose computer such as a PC or a server apparatus, for example.
  • the gingival diagnosis support apparatus 20B can also be realized as SaaS on the cloud.
  • the imaging device 10B, the gingival diagnosis support device 20B, and the display device 30 are connected to each other via a network such as the Internet.
  • the gingival diagnosis support apparatus 20B includes a contour extraction unit 22, a curve approximation unit 23, a correlation calculation unit 24, and a gingival diagnosis data generation unit 25.
  • the contour extracting unit 22, the curve approximating unit 23, the correlation calculating unit 24, and the gingival diagnosis data generating unit 25 can be realized by software, hardware, or a combination thereof.
  • the contour extracting unit 22 extracts the contour of the gingival margin from the front photo image of the teeth and gums, and generates contour point cloud data. Specifically, the contour extracting unit 22 calculates a difference in luminance or contrast between adjacent pixels in a photographic image, and extracts a portion where the difference is large as a contour.
  • 4B, 5B, and 6B show examples of contour point group data obtained from the photographic images of FIGS. 4A, 5A, and 6A, respectively.
  • FIG. 4B, FIG. 5B and FIG. 6B by extracting the outline of the gingival margin from the front photo image of the tooth and gingiva, the boundary between the tooth and gingiva is expressed as outline point group data.
  • the curve approximating unit 23 performs function fitting on the point cloud data at the boundary between the teeth and the gingiva among the contour point cloud data generated by the contour extracting unit 22 to derive an approximate curve.
  • a polynomial of an arbitrary order can be used as the approximate curve. This is because there are individual differences, individual differences, secular differences, etc. in the approximate curve of the boundary between teeth and gingiva. Accordingly, the polynomial of the approximate curve is not limited in the function fitting, and an approximate curve that can approximate the boundary between the teeth and the gingiva with a smaller error is found.
  • the correlation calculation unit 24 calculates an index indicating the degree of correlation between the point cloud data at the boundary between the teeth and the gingiva and the approximate curve.
  • a correlation coefficient R or a determination coefficient R ⁇ 2 can be used as the index.
  • the gingival diagnosis data generation unit 25 generates gingival diagnosis data in which an approximate curve is superimposed on the point cloud data at the boundary between the teeth and the gingiva.
  • FIG. 4C, FIG. 5C, and FIG. 6C show gingival diagnosis data in which approximate curves are superimposed on the point cloud data at the boundary between the teeth and gingiva in FIGS. 4B, 5B, and 6B, respectively.
  • gingival diagnosis data is represented as a two-dimensional graph.
  • the approximate curve shown in FIG. 4C is a second order polynomial, and the approximate curves shown in FIGS. 5C and 6C are fourth order polynomials.
  • the gingival diagnosis data may include, for example, the determination coefficient R ⁇ 2 between the point cloud data at the boundary between the tooth and the gingiva calculated by the correlation calculation unit 24 and the approximate curve.
  • the degree of correlation between the point cloud data at the boundary between the teeth and the gingiva and the approximate curve can be known numerically.
  • the display device 30 is a device that displays gingival diagnosis data generated by the gingival diagnosis support device 20B.
  • the display device 30 displays the front photographic images of the teeth and gingiva of FIGS. 4A, 5A, and 6A and the gingival diagnostic data of FIGS. 4C, 5C, and 6C side by side.
  • the dentist can objectively determine the jaggedness or smoothness of the boundary between the teeth and the gingiva, the degree of error from the approximate curve, and the like.
  • the original image data acquired by the imaging devices 10A and 10B is stored in a storage device (not shown), and the gingival diagnosis support devices 20A and 20B Arbitrary original image data may be read from the storage device and analyzed. Further, the gingival diagnosis data generated by the gingival diagnosis support apparatuses 20A and 20B may be stored in the storage device. Thereby, it becomes easy to follow the secular change of each patient's gingiva, and more accurate diagnosis of gingiva and prevention of gingivitis based on the secular change can be performed.
  • past diagnosis results by the dentist may be stored together, and the gingival diagnosis support apparatuses 20A and 20B may be machine-learned about the diagnosis tendency of the dentist.
  • diagnosis result in the past similar example can be presented to the dentist with respect to the newly generated gingival diagnosis data.
  • the gingival diagnosis support devices 20A and 20B can propose gingival diagnosis criteria to the dentist based on a large amount of past diagnosis results.

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  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Surgery (AREA)
  • Biomedical Technology (AREA)
  • Medical Informatics (AREA)
  • Optics & Photonics (AREA)
  • Pathology (AREA)
  • Radiology & Medical Imaging (AREA)
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  • Engineering & Computer Science (AREA)
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  • Heart & Thoracic Surgery (AREA)
  • Nuclear Medicine, Radiotherapy & Molecular Imaging (AREA)
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  • Dentistry (AREA)
  • Oral & Maxillofacial Surgery (AREA)
  • Dental Tools And Instruments Or Auxiliary Dental Instruments (AREA)
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Abstract

L'invention concerne un dispositif d'assistance au diagnostic de la gingivite (20A) qui est pourvu d'une unité d'extraction de données de section transversale (21) pour extraire des données de section transversale dans la direction de la profondeur d'une partie périphérique de gingivite à partir de données de groupes de points tridimensionnels de l'avant d'une bouche, et une unité de production de données de diagnostic de gingivite (25) destinée à convertir les données de section transversale en un format approprié au diagnostic de la gingivite et produire des données de diagnostic de la gingivite, l'unité de production de données de diagnostic de la gingivite (25) produisant, en tant que données de diagnostic de gingivite, un graphique bidimensionnel dans lequel la direction gauche-droite ou la direction de haut en bas de l'avant de la bouche est le premier axe et le sens de la profondeur est le second axe, par exemple.
PCT/JP2017/017678 2016-05-10 2017-05-10 Dispositif d'assistance au diagnostic de la gingivite et système d'assistance au diagnostic de la gingivite Ceased WO2017195820A1 (fr)

Priority Applications (4)

Application Number Priority Date Filing Date Title
KR1020187035703A KR20190004797A (ko) 2016-05-10 2017-05-10 치주 조직 진단 지원장치 및 치주 조직 진단 지원시스템
EP17796180.2A EP3456240A4 (fr) 2016-05-10 2017-05-10 Dispositif d'assistance au diagnostic de la gingivite et système d'assistance au diagnostic de la gingivite
CN201780029030.7A CN109561820A (zh) 2016-05-10 2017-05-10 牙龈诊断辅助装置和牙龈诊断辅助系统
US16/099,909 US20190150825A1 (en) 2016-05-10 2017-05-10 Gum diagnosis assisting apparatus and gum diagnosis assisting system

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
JP2016094486 2016-05-10
JP2016-094486 2016-05-10
JP2017-031801 2017-02-23
JP2017031801A JP6378793B2 (ja) 2016-05-10 2017-02-23 歯肉診断支援装置および歯肉診断支援システム

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WO2017195820A1 true WO2017195820A1 (fr) 2017-11-16

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PCT/JP2017/017678 Ceased WO2017195820A1 (fr) 2016-05-10 2017-05-10 Dispositif d'assistance au diagnostic de la gingivite et système d'assistance au diagnostic de la gingivite

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US12329596B2 (en) 2018-10-11 2025-06-17 Kuraray Noritake Dental Inc. Dental treatment assistance device, dental treatment assistance system, dental treatment assistance method, dental treatment assistance program, and dental product sales promotion device

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2001212081A (ja) * 2000-01-31 2001-08-07 Matsushita Electric Ind Co Ltd 口腔撮像装置
JP2005168520A (ja) * 2003-12-05 2005-06-30 Morita Mfg Co Ltd 診断用撮影器
JP2009183323A (ja) * 2008-02-01 2009-08-20 Satoru Shinpo 歯周疾患検査装置
US20120015316A1 (en) * 2001-04-13 2012-01-19 Rohit Sachdeva Unified three dimensional virtual craniofacial and dentition model and uses thereof
JP2012157692A (ja) * 2011-01-11 2012-08-23 Advance Co Ltd 口腔内撮影表示システム
JP2015116303A (ja) 2013-12-18 2015-06-25 メディア株式会社 歯周病診断支援装置及びその方法並びにプログラム

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2001212081A (ja) * 2000-01-31 2001-08-07 Matsushita Electric Ind Co Ltd 口腔撮像装置
US20120015316A1 (en) * 2001-04-13 2012-01-19 Rohit Sachdeva Unified three dimensional virtual craniofacial and dentition model and uses thereof
JP2005168520A (ja) * 2003-12-05 2005-06-30 Morita Mfg Co Ltd 診断用撮影器
JP2009183323A (ja) * 2008-02-01 2009-08-20 Satoru Shinpo 歯周疾患検査装置
JP2012157692A (ja) * 2011-01-11 2012-08-23 Advance Co Ltd 口腔内撮影表示システム
JP2015116303A (ja) 2013-12-18 2015-06-25 メディア株式会社 歯周病診断支援装置及びその方法並びにプログラム

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See also references of EP3456240A4 *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US12329596B2 (en) 2018-10-11 2025-06-17 Kuraray Noritake Dental Inc. Dental treatment assistance device, dental treatment assistance system, dental treatment assistance method, dental treatment assistance program, and dental product sales promotion device

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