WO2015130071A1 - Dispositif de mesure tridimensionnelle pour dents intra-orales - Google Patents

Dispositif de mesure tridimensionnelle pour dents intra-orales Download PDF

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Publication number
WO2015130071A1
WO2015130071A1 PCT/KR2015/001805 KR2015001805W WO2015130071A1 WO 2015130071 A1 WO2015130071 A1 WO 2015130071A1 KR 2015001805 W KR2015001805 W KR 2015001805W WO 2015130071 A1 WO2015130071 A1 WO 2015130071A1
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WO
WIPO (PCT)
Prior art keywords
light
unit
light guide
imaging
teeth
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Application number
PCT/KR2015/001805
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English (en)
Korean (ko)
Inventor
정성민
고민국
김경호
김민성
김종호
Original Assignee
주식회사 덴티움
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Publication date
Application filed by 주식회사 덴티움 filed Critical 주식회사 덴티움
Publication of WO2015130071A1 publication Critical patent/WO2015130071A1/fr

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    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61C—DENTISTRY; APPARATUS OR METHODS FOR ORAL OR DENTAL HYGIENE
    • A61C19/00—Dental auxiliary appliances
    • A61C19/04—Measuring instruments specially adapted for dentistry
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B5/00—Measuring for diagnostic purposes; Identification of persons
    • A61B5/0059—Measuring for diagnostic purposes; Identification of persons using light, e.g. diagnosis by transillumination, diascopy, fluorescence
    • A61B5/0062—Arrangements for scanning
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B35/00—Stereoscopic photography
    • G03B35/08—Stereoscopic photography by simultaneous recording

Definitions

  • the present invention relates to a three-dimensional measuring device for measuring the teeth in the oral cavity.
  • methods for treating teeth include methods such as orthodontic treatment, filling treatment, and prosthetic treatment.
  • a treatment such as a filler or a prosthesis having the same shape as the tooth.
  • Such a three-dimensional measuring apparatus is generally configured to obtain image information about an intraoral tooth through an image sensor and a lens, and thereby generate three-dimensional position information of the tooth.
  • a lens or an image sensor having a large diameter may be used, but in this case, the thickness of the measuring device is thick, which makes it difficult to insert orally.
  • such lenses usually have a short focal length, so that the length that can be inserted into the mouth is not long. Accordingly, teeth located deep within the mouth of the patient, such as molar or wisdom teeth, are not easy to measure.
  • An object of the present invention while having a sufficient length that can be inserted into the oral cavity, it is easy to use because the thickness is small, it is possible to obtain high-precision three-dimensional positional information about the oral teeth, three-dimensional measurement of the oral teeth To provide a device.
  • the three-dimensional measuring device for the oral cavity the light output unit for outputting light toward the intraoral teeth;
  • a light guiding unit having a higher refractive index than air and receiving two reflected light beams reflected from the tooth in different directions by the light and outputting the two reflected light beams;
  • An imaging unit having two imaging modules each receiving the two transmission lights to generate two image information for the tooth;
  • a processing unit for generating depth information about the shape of the tooth, based on the two image information received from the imaging unit.
  • the imaging module the lens unit for receiving the transmitted light; And an image sensor unit configured to generate the image information by receiving the transmitted light from the lens unit.
  • the lens unit may include a macro lens or a telecentric lens.
  • the two imaging modules may be arranged such that their imaging axes form an angle of 5 ° to 30 ° with each other.
  • the light guide unit may include a first light guide part, and the first light guide part may include: a transmission surface on which the reflected light is incident; And a reflective surface that forms an acute angle with the transmissive surface, and reflects the reflected light incident through the transmissive surface to output the transmitted light.
  • the light guiding unit includes a second light guiding unit, and the second light guiding unit outputs the transmitted light toward the imaging module, and generates two light emitting surfaces each perpendicular to the imaging axes of the two imaging modules. It may include.
  • the light guiding unit includes: a first light guiding unit for reflecting the reflected light back and outputting the reflected light; And a second light guide part integrally formed with the first light guide part to guide the transmitted light output from the first light guide part toward the imaging module.
  • the refractive index may be 1.01 to 2.5.
  • the light guide unit may include a material of rhodochrosite.
  • the light guide unit Having a length D 1 , where W 0 is a width of the area under measurement in the oral cavity imaged by the imaging unit, and is 5 mm to 20 mm, and D 0 is a distance from the focal length of the lens unit to the area under measurement when the refractive index is 1.
  • the e 1 may be the refractive index.
  • the light output unit may include a light source disposed in an edge region of the transmission surface.
  • the light output unit the light source for outputting the light; And a reflector reflecting light output from the light source to transmit the transmissive surface to the tooth.
  • a first polarization filter disposed in front of the light output unit in the direction in which the light is output; And a second polarization filter disposed between the light guide unit and the imaging unit to repolarize the transmitted light polarized by the first polarization filter.
  • the first polarizing filter may include a pattern perpendicular to the pattern of the second polarizing filter.
  • the three-dimensional measuring device for the intraoral teeth configured as described above, since the light reflected from the teeth is refracted through the light guide unit of the high refractive index, the length that can be inserted into the oral cavity is long, deep in the oral cavity Even teeth located can be easily taken. In addition, it is possible to obtain a clear tooth image without increasing the size of the lens unit and the image sensor unit, it is possible to improve the usability through the miniaturization of the thickness.
  • the optical axis of the light source for the tooth and the imaging axis of the imaging module for the tooth are located close to the same axis, thereby providing clear image information about the tooth. Can be obtained.
  • the configuration of the first polarizing filter and the second polarizing filter it is possible to obtain high-precision dental image information from which noise such as diffuse reflection is removed.
  • FIG. 1 is a perspective view of a three-dimensional measuring device 100 for the oral cavity in accordance with an embodiment of the present invention.
  • FIG. 2 is a side view of the three-dimensional measurement device 100 for the intraoral teeth of FIG.
  • FIG. 3 is a plan view of the three-dimensional measurement device 100 for the intraoral teeth of FIG.
  • FIG. 5 is an operation of the three-dimensional measurement device 100 for the intraoral teeth of FIG.
  • FIG. 6 is a side view of a three-dimensional measuring apparatus 100 ′ for oral teeth according to another embodiment of the present invention.
  • FIG. 1 is a perspective view of a three-dimensional measuring device 100 for the oral cavity in accordance with an embodiment of the present invention.
  • the three-dimensional measuring device (hereinafter, abbreviated as 'three-dimensional measuring device') for oral teeth is configured to hold the housing 110 with one hand and insert directly into the patient's mouth. . Specifically, the operator inserts the three-dimensional measuring device 100 into the oral cavity, and then photographs the tooth (T) requiring treatment, as well as an image of the tooth (T), as well as depth information on the shape of the tooth (T). Can be obtained. As such, the depth information and the image information obtained through the imaging may be used as three-dimensional information about the tooth (T), and thus may be used to manufacture the same type of treatment as the tooth (T).
  • the three-dimensional measuring apparatus 100 has a suitable length so that the operator can easily image the teeth (T) located deep in the mouth of the patient, such as molar or wisdom teeth, it will be described in detail below.
  • FIG. 2 is a side view of the three-dimensional measuring apparatus 100 for the intraoral teeth of FIG. 1
  • FIG. 3 is a plan view of the three-dimensional measuring apparatus 100 for the intraoral teeth of FIG. 1.
  • the 3D measuring apparatus 100 may include a light output unit 120, a filter unit 130, a light guide unit 140, an imaging unit 150, and a processing unit 160. .
  • the light output unit 120 is configured to output light L 1 .
  • the light output unit 120 may include a light source 121.
  • the light source 121 may be disposed to surround the edge region of the transmissive surface 142 of the light guide unit 140, which will be described later, and output light L 1 toward the intraoral tooth T.
  • the light output unit 120 may further include a controller for adjusting on / off or brightness of the light source 121.
  • the filter unit 130 may include a first polarization filter 131 and a second polarization filter 132.
  • the first polarization filter 131 may be disposed between the light source 121 and the tooth (T). As a result, the first polarization filter 131 may polarize the light L 1 output from the light source 121.
  • the second polarization filter 132 may be disposed between the light emitting surface 146 of the light guide unit 140 and the imaging unit 150, which will be described later. In this arrangement, the second polarization filter 132 may re-polarize the transmission light L 3 due to the light L 1 polarized by the first polarization filter 131.
  • the pattern of the first polarization filter 131 and the pattern of the second polarization filter 132 may be formed to be perpendicular to each other.
  • the light guide unit 140 may be formed of a light transmissive material such as glass. Specifically, the light guide unit 140 may have a refractive index of 1.01 to 2.5, for example, may be made of a material of rhodochrosite (tung manganese). The light guide unit 140 may include a first light guide 141 and a second light guide 145.
  • the first light guide part 141 may include a transmissive surface 142 and a reflective surface 143.
  • the transmission surface 142 is a surface facing the tooth (T).
  • the transmission surface 142 is configured such that two reflected light beams L 2 reflected from the teeth T in different directions by the light L 1 of the light source 121 are incident.
  • the reflective surface 143 is configured to form an acute angle with the transmissive surface 142.
  • the reflective surface 143 may reflect back the reflected light L 2 incident through the transmission surface 142 to output the transmitted light L 3 .
  • the second light guide part 145 is configured to guide the transmitted light L 3 output from the first light guide part 141 toward the imaging unit 150 described later. To this end, the second light guide part 145 may be integrally formed with the first light guide part 141.
  • the second light guide part 145 may include a light exit surface 146.
  • the light exit surface 146 is formed on the opposite side of the reflective surface 143 and is configured to output the transmitted light L 3 reflected back from the first light guide portion 141 toward the imaging module 151.
  • the light exit surface 146 may be configured to be perpendicular to each of the imaging axes X of the two imaging modules 151 described later.
  • the imaging unit 150 may include two imaging modules 151.
  • the two imaging modules 151 may be arranged such that their imaging axes X are at an angle of 5 ° to 30 °, specifically 7 ° to 15 °.
  • the imaging module 151 may include a lens unit 152 and an image sensor unit 153.
  • the lens unit 152 is configured to receive the transmission light L 3 and may be configured as a macro lens or a telecentric lens.
  • the image sensor unit 153 may be configured to receive the transmission light L 3 from the lens unit 152 and generate image information about the tooth T.
  • the processing unit 160 is a component for generating depth information about the shape of the tooth T.
  • the imaging unit 150 may generate two image information about the teeth T through the two image sensor units 153, and the processing unit 160 may be received from the image sensor unit 153. By combining two pieces of image information, depth information that is three-dimensional information about the shape of the tooth T can be generated.
  • the operator may first insert the 3D measuring device 100 into the oral cavity of the patient, so that the transmission surface 142 may face the tooth (T). Thereafter, the operator may operate the light source 121 by manipulating a switch or the like.
  • the light L 1 output from the light source 121 is incident toward the tooth T via the first polarization filter 131.
  • the light L 1 incident on the tooth T is reflected at the surface of the tooth T, which may be referred to as reflected light L 2 in the present embodiment.
  • the reflected light L 2 may pass through the transmission surface 142 and be incident toward the reflection surface 143.
  • the reflected light L 2 is reflected back from the reflective surface 143 and output toward the lens unit 152, which may be referred to as a transmission light L 3 in the present embodiment.
  • the light source 121 since the light source 121 is disposed close to the transmission surface 142 (the edge region of the transmission surface 142), the light L 1 and the reflected light L 2 output from the light source 121 are provided. The angle between them can be reduced relatively. Accordingly, the reflected light L 2 is not the light L 1 incident obliquely toward the tooth T, but the light incident in the direction relatively parallel to the traveling direction of the reflected light L 2 toward the tooth T ( L 1 ). Thereafter, the reflected light L 2 is reflected back from the reflecting surface 143 and is incident to the imaging unit 150.
  • the imaging axis (X) [transmission of the light (L 1) an image pickup unit 150 to the traveling direction axis and the teeth (T) of the source 121 to the tooth (T) light (L 3 Since the angle formed by the traveling direction axis of the X) becomes relatively small, the imaging unit 150 may acquire an image in which noise is minimized.
  • the first polarization filter 131 and the second polarization filter 132 may have a pattern perpendicular to each other, it is possible to remove diffuse reflection that may be generated by the light L 1 of the light source 121.
  • the tooth T is illuminated by the first polarized light L 1 by the first polarization filter 131, and the reflected light L 2 reflected from the surface of the tooth T is second polarized again. Since it is polarized by the filter 132, according to the present exemplary embodiment, noise generated in the process of reflecting the first polarized light L 1 on the surface of the tooth T may be minimized. Accordingly, excellent raw data of the image information of the tooth T can be obtained, and thus, the tooth T image having higher precision than the case of post-processing the acquired image information in software can be obtained. .
  • the reflected light L 2 reflected from the teeth T may be composed of two reflected in different directions. As described above, the two reflected light beams L 2 having different viewing angles may be reflected by the reflecting surface 143 to be incident to each imaging module 151. Then, by obtaining depth information about the shape of the tooth T through the image sensor unit 153 and the processing unit 160, it is possible to obtain a three-dimensional shape for the tooth T by a conventional stereo vision method. have.
  • FIG. 4 is a flowchart of the transmission light L 3 under 1 atmosphere of pressure
  • FIG. 5 is an operation diagram of the three-dimensional measuring apparatus 100 of FIG. 1.
  • the focal angle ⁇ 0 is an inherent value determined by lens processing of the lens unit 152 and may have a value of 1 ° to 45 °.
  • Focal angle ( ⁇ 0 ) is Will follow.
  • the width W 0 is a width of an area to be measured in the oral cavity imaged by the imaging unit 150, and may generally have a value of 5 mm to 20 mm so that one or more teeth T may be imaged.
  • the length D 0 refers to the length from the focal length f of the lens unit 152 to the area under measurement when the light guide unit 140 is not provided. It can typically have a value of 30 mm to 200 mm.
  • the light exit surface 146 when the light exit surface 146 is positioned at the focal length f of the lens unit 152, It may have a length (D 1 ) to satisfy.
  • the width W 0 and the transmission light L 3 of the region to be measured may be shown on one plane as shown in this drawing. .
  • the refractive index e 1 is the refractive index of the light guide unit 140.
  • the light guide unit 140 is composed of rhodochrosite having a refractive index e 1 of 1.847, width W 0 is 11 mm, length D 0 is 45 mm, and focal angle ⁇ 0 is In the case of 14.041 °, the length D 1 of the light guiding unit 140 may have 83.562 mm. According to such a configuration, when the image area to be measured having the same width W 0 is to be captured using the same lens unit 152, the length of the light guide unit 140 that can be inserted into the oral cavity becomes about 38.6 mm long. Therefore, the operator can easily insert the three-dimensional measurement apparatus 100 to the teeth (T) located deep in the oral cavity of the patient to proceed with the imaging process for the teeth (T).
  • FIG. 6 is a side view of a three-dimensional measuring apparatus 100 ′ according to another embodiment of the present invention.
  • the light output unit 120 ′ may include a light source 121 ′ and a reflector 122.
  • the light source 121 ′ may be disposed above the second light guide portion 145 ′.
  • the reflector 122 may be attached to an upper surface of the second light guide portion 145 ′.
  • the reflector 122 may reflect the light L 1 output from the light source 121 ′ and transmit the light through the transmission surface 142 to enter the tooth T.
  • the first polarization filter 131 ′ may be disposed between the light source 121 ′ and the reflector 122.
  • the imaging unit 150 may obtain an image with the noise minimized as in the above-described embodiment.
  • the first light guide part 141 ′ and the second light guide part 145 ′ may be manufactured separately and then connected to each other. According to such a structure, it is more economical than the case where the first light guide portion 141 'and the second light guide portion 145' are manufactured integrally, and the manufacturing process can be facilitated.
  • the three-dimensional measuring device for the oral cavity tooth as described above is not limited to the configuration and operation of the embodiments described above.
  • the above embodiments may be configured such that various modifications may be made by selectively combining all or part of the embodiments.

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  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Biomedical Technology (AREA)
  • Biophysics (AREA)
  • Veterinary Medicine (AREA)
  • Public Health (AREA)
  • Animal Behavior & Ethology (AREA)
  • Oral & Maxillofacial Surgery (AREA)
  • Epidemiology (AREA)
  • Dentistry (AREA)
  • Nuclear Medicine, Radiotherapy & Molecular Imaging (AREA)
  • Radiology & Medical Imaging (AREA)
  • Physics & Mathematics (AREA)
  • Pathology (AREA)
  • Heart & Thoracic Surgery (AREA)
  • Medical Informatics (AREA)
  • Molecular Biology (AREA)
  • Surgery (AREA)
  • Dental Tools And Instruments Or Auxiliary Dental Instruments (AREA)
  • Endoscopes (AREA)

Abstract

La présente invention concerne un dispositif de mesure tridimensionnelle pour dents intra-orales comprenant les éléments suivants : une unité de sortie optique permettant d'émettre de la lumière en direction des dents intra-orales ; une unité de guidage de lumière qui possède un indice de réfraction supérieur à l'air, et reçoit deux lumières réfléchies qui sont réfléchies par la lumière provenant des dents dans différentes directions, puis émet les lumières réfléchies sous forme de deux lumières transmises ; une unité de photographie comportant deux modules de photographie, lesdits modules de photographie recevant les deux lumières transmises et produisant deux éléments d'informations d'image concernant les dents ; et une unité de traitement pour la production d'informations de profondeur concernant la forme des dents sur la base des deux éléments d'informations d'image reçues depuis l'unité de photographie.
PCT/KR2015/001805 2014-02-26 2015-02-25 Dispositif de mesure tridimensionnelle pour dents intra-orales WO2015130071A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
KR10-2014-0022839 2014-02-26
KR1020140022839A KR101524605B1 (ko) 2014-02-26 2014-02-26 구강내 치아에 대한 3차원 측정 장치

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108136600A (zh) * 2015-09-28 2018-06-08 株式会社理光 系统
US20220079717A1 (en) * 2019-05-21 2022-03-17 Medit Corp. Three-dimensional intraoral scanner

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101859505B1 (ko) * 2017-05-16 2018-05-21 한국광기술원 공초점 방식을 이용한 3차원 구강 스캐너

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KR20100087629A (ko) * 2009-01-28 2010-08-05 파나소닉 주식회사 구강 내 측정 장치 및 구강 내 측정 시스템
JP2010220713A (ja) * 2009-03-23 2010-10-07 Panasonic Corp 口腔内スキャナーと、それを用いた口腔内画像測定装置
KR20100114843A (ko) * 2009-04-16 2010-10-26 케어스트림 헬스 인코포레이티드 인트라 오랄 이미징 장치 및 치아의 표면 이미지를 구하는 방법
KR20110068954A (ko) * 2011-01-26 2011-06-22 데오덴탈 주식회사 구강용 스캐너

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Publication number Priority date Publication date Assignee Title
KR20100087629A (ko) * 2009-01-28 2010-08-05 파나소닉 주식회사 구강 내 측정 장치 및 구강 내 측정 시스템
JP2010220713A (ja) * 2009-03-23 2010-10-07 Panasonic Corp 口腔内スキャナーと、それを用いた口腔内画像測定装置
KR20100114843A (ko) * 2009-04-16 2010-10-26 케어스트림 헬스 인코포레이티드 인트라 오랄 이미징 장치 및 치아의 표면 이미지를 구하는 방법
KR20110068954A (ko) * 2011-01-26 2011-06-22 데오덴탈 주식회사 구강용 스캐너

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108136600A (zh) * 2015-09-28 2018-06-08 株式会社理光 系统
EP3356092A4 (fr) * 2015-09-28 2018-09-19 Ricoh Company, Ltd. Système
US10737391B2 (en) 2015-09-28 2020-08-11 Ricoh Company, Ltd. System for capturing an image
CN108136600B (zh) * 2015-09-28 2021-03-23 株式会社理光 系统
US20220079717A1 (en) * 2019-05-21 2022-03-17 Medit Corp. Three-dimensional intraoral scanner

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