1. National Center for Geriatrics and Gerontology in Japan

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    1. Mentioned In 78 Articles

    2. Diagnosis of Occlusal Tooth Wear Using 3D Imaging of Optical Coherence Tomography Ex Vivo

      Explore MDPI Open Access Journals Platform Dentistry
      Diagnosis of Occlusal Tooth Wear Using 3D Imaging of Optical Coherence Tomography Ex Vivo
      The aim of this study was to assess the utility of 3D imaging of optical coherence tomography (OCT) for the diagnosis of occlusal tooth wear ex vivo. Sixty-three extracted human molars with or without visible tooth wear were collected to take digital intraoral radiography and 3D OCT images. The degree of tooth wear was evaluated by 12 examiners and scored using 4-rank scale: 1slight enamel wear; 2distinct enamel wear; 3tooth ...
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      Mentions: University of Washington Yasunori Sumi Tokyo Medical & Dental University

    3. Evaluation of dental caries, tooth crack, and age-related changes in tooth structure using optical coherence tomography

      Explore ScienceDirect Dentistry
      Evaluation of dental caries, tooth crack, and age-related changes in tooth structure using optical coherence tomography
      Optical coherence tomography (OCT) is an imaging technique that can visualize the internal biological structure without X-ray exposure. Swept-source OCT (SS-OCT) is one of the latest version of OCT, wherein the light source is a tunable laser that sweeps near-infrared wavelength light to achieve real-time imaging. The imaging depth of OCT is highly influenced by the translucency of the medium. The medium that does not transmit light and the deeper ...
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      Mentions: Yasunori Sumi Tokyo Medical & Dental University National Center for Geriatrics and Gerontology in Japan

    4. Interfacial Evaluation of CAD/CAM Resin Inlays on the Cavity Floor Using Swept-source Optical Coherence Tomography

      Explore Allen Press Dentistry
      Interfacial Evaluation of CAD/CAM Resin Inlays on the Cavity Floor Using Swept-source Optical Coherence Tomography
      Purpose: The first objective of this study was to determine whether the luting material used for computer-aided design and computer-aided manufacture resin nanoceramic inlays affected interfacial adaptation. The second objective was to investigate whether application of a universal dentin adhesive before cementation affected interfacial adaptation. The final objective was to compare the inlay-side and dentin-side interfaces in the cement space. Methods and Materials: Seventy-four class I cavities were prepared on ...
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      Mentions: National Center for Geriatrics and Gerontology in Japan Alireza Sadr Junji Tagami

    5. 3D imaging of proximal caries in posterior teeth using optical coherence tomography

      Explore Nature Publishing Group Dentistry
      3D imaging of proximal caries in posterior teeth using optical coherence tomography
      Optical coherence tomography (OCT) can create cross-sectional images of tooth without X-ray exposure. This study aimed to investigate the diagnostic accuracy of 3D imaging of OCT for proximal caries in posterior teeth. Thirty-six human molar teeth with 51 proximal surfaces visibly 6 intact, 16 slightly demineralized, and 29 distinct carious changes were mounted to take digital radiographs and 3D OCT images. The sensitivity, specificity and area under the receiver operating ...
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      Mentions: University of Washington Yasunori Sumi National Center for Geriatrics and Gerontology in Japan

    6. Method and apparatus for measuring and displaying dental plaque, gingiva, and alveolar bone

      Explore uspto.gov Dentistry , Patents
      Method and apparatus for measuring and displaying dental plaque, gingiva, and alveolar bone
      A method and an apparatus for measuring and displaying dental plaque are provided, and the method includes the steps of dividing near infrared light output from a light source into measurement light and reference light, applying the measurement light toward a tooth in an oral cavity and scanning the tooth with the measurement light, producing interference light from reflected light and back-scattered light from the tooth and the reference light ...
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      Mentions: Nobuyoshi Ozawa Yasunori Sumi National Center for Geriatrics and Gerontology in Japan

    7. Three-dimensional assessment of proximal contact enamel using optical coherence tomography

      Explore ScienceDirect Dentistry
      Three-dimensional assessment of proximal contact enamel using optical coherence tomography
      Objective The purpose of this study was to detect and investigate the association of enamel microcracks with demineralization at proximal contact areas of premolars, using 3D swept-source optical coherence tomography (SS-OCT). Methods Extracted maxillary and mandibular premolars (n = 50 each), without any visible tooth cracks, were examined for demineralization of interproximal contact areas, using the International Caries Detection and Assessment System (ICDAS). SS-OCT was used to evaluate demineralization and detect ...
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      Mentions: University of Washington Yasunori Sumi Tokyo Medical & Dental University

    8. Assessment of root caries under wet and dry conditions using swept-source optical coherence tomography (SS-OCT)

      Explore jstage.jst.go.jp Dentistry
      Assessment of root caries under wet and dry conditions using swept-source optical coherence tomography (SS-OCT)
      The purpose of this study was to compare optical properties of root caries under two observing conditions using swept-source optical coherence tomography (SS-OCT). In vitro and natural root caries were observed by SS-OCT under wet and dry conditions, followed by confocal laser scanning microscope (CLSM) and transverse microradiography (TMR). Signal intensity (SI), distance between SI peaks (SI-distance) and optical lesion depth were obtained from OCT. Lesion depth was measured from ...
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      Mentions: University of Washington Yasunori Sumi Tokyo Medical & Dental University

    9. Assessment of enamel cracks at adhesive cavosurface margin using three-dimensional swept-source optical coherence tomography

      Explore ScienceDirect Dentistry
      Assessment of enamel cracks at adhesive cavosurface margin using three-dimensional swept-source optical coherence tomography
      Objectives Swept-source optical coherence tomography (SS-OCT) can construct cross-sectional images of internal biological structures. The aim of this study was to evaluate enamel cracks at the cavosurface margin of composite restorations using SS-OCT. Methods Bowl-shaped cavities were prepared at two locations (mid-coronal and cervical regions) on the enamel surface of 60 bovine teeth. Half of the cavities (30) were treated with phosphoric acid gel. A two-step self-etch adhesive (Clearfil SE ...
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      Mentions: National Center for Geriatrics and Gerontology in Japan Alireza Sadr Junji Tagami

    10. Resolution characteristics of optical coherence tomography for dental use

      Explore Resolve a DOI Dentistry
      Resolution characteristics of optical coherence tomography for dental use
      OBJECTIVES: The purpose of this study was to clarify resolution characteristics of optical coherence tomography (OCT) for dental use. METHODS: Two types of swept-source OCT machines (SS-OCTs) were employed in this study. To clarify their resolution characteristics, we newly developed a glass chart device with a ladder pattern of wavelengths, which ranged from (4 x 2) m to (1024 x 2) m, as well as a star-target pattern, a grid ...
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      Mentions: Santec Yasunori Sumi Tohru Kurabayashi

    11. A pilot study to assess the morphology and progression of non-carious cervical lesions

      Explore ScienceDirect Dentistry
      A pilot study to assess the morphology and progression of non-carious cervical lesions
      Objective This longitudinal pilot study aimed to morphologically and quantitatively investigate the progress of non-carious cervical lesions (NCCLs) by using swept-source optical coherence tomography (SS-OCT). Methods The samples examined comprised sets of NCCL epoxy resin replicas obtained from 10 lesions in 6 patients who attended annual dental visits over 4 or 5 years. SS-OCT images of the replicas were analyzed in terms of the maximum depth (D max ) and corresponding ...
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      Mentions: Yasunori Sumi National Center for Geriatrics and Gerontology in Japan Junji Tagami

    12. Three-Dimensional Analysis of Enamel Crack Behavior Using Optical Coherence Tomography

      Explore Journal of Dental Research Dentistry
      Three-Dimensional Analysis of Enamel Crack Behavior Using Optical Coherence Tomography
      The aim of this study was to nondestructively analyze enamel crack behavior on different areas of teeth using 3D swept source-optical coherence tomography (SS-OCT). Ten freshly extracted human teeth of each type on each arch ( n = 80 teeth) were inspected for enamel crack patterns on functional, contact and nonfunctional, or noncontact areas using 3D SS-OCT. The predominant crack pattern for each location on each specimen was noted and analyzed. The ...
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      Mentions: Yasunori Sumi Tokyo Medical & Dental University National Center for Geriatrics and Gerontology in Japan

    13. Optical analysis of enamel and dentin caries in relation to mineral density using swept-source optical coherence tomography

      Explore SPIE | Journal Dentistry
      Optical analysis of enamel and dentin caries in relation to mineral density using swept-source optical coherence tomography
      The aim of this study was to evaluate the signal intensity and signal attenuation of swept source optical coherence tomography (SS-OCT) for dental caries in relation to the variation of mineral density. SS-OCT observation was performed on the enamel and dentin artificial demineralization and on natural caries. The artificial caries model on enamel and dentin surfaces was created using Streptococcus mutans biofilms incubated in an oral biofilm reactor. The lesions ...
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      Mentions: Yasunori Sumi Tokyo Medical & Dental University National Center for Geriatrics and Gerontology in Japan

    14. The effectiveness of optical coherence tomography for evaluating peri-implant tissue: A pilot study

      Explore KoreaMed Synapse Ophthalmology
      The effectiveness of optical coherence tomography for evaluating peri-implant tissue: A pilot study
      Purpose Optical coherence tomography (OCT) has been investigated as a novel diagnostic imaging tool. The utilisation of this equipment has been evaluated through several studies in the field of dentistry. The aim of this preliminary study was to determine through basic experiments the effectiveness of OCT in implant dentistry. Materials and Methods To assess detection ability, we captured OCT images of implants in each of the following situations: (1) implants ...
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      Mentions: Yasunori Sumi Tokyo Medical & Dental University National Center for Geriatrics and Gerontology in Japan

    15. Method and apparatus for measuring and displaying dental plaque

      Explore uspto.gov Dentistry , Patents
      Method and apparatus for measuring and displaying dental plaque
      A method and an apparatus for measuring and displaying dental plaque are provided, and the method includes the steps of dividing near infrared light output from a light source into measurement light and reference light, applying the measurement light toward a tooth in an oral cavity and scanning the tooth with the measurement light, producing interference light from reflected light and back-scattered light from the tooth and the reference light ...
      Read Full Article
      Mentions: Nobuyoshi Ozawa Yasunori Sumi National Center for Geriatrics and Gerontology in Japan

    16. Assessment of bacterial demineralization around composite restorations using swept-source optical coherence tomography (SS-OCT)

      Explore Elsevier Health Dentistry
      Assessment of bacterial demineralization around composite restorations using swept-source optical coherence tomography (SS-OCT)
      Objective To observe the bacterial demineralization of the enamel and dentin around composite restorations bonded with one-step and two-step self-etch adhesive systems using swept-source optical coherence tomography (SS-OCT). Methods Forty class V cavities (2.5-mm surface diameter, 2.0-mm maximum depth) were prepared on cervical areas of 20 human molars. The specimens were either treated with one-step adhesive (Clearfil Tri-S Bond ND Quick; TS) or two-step adhesive (Clearfil SE Bond ...
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      Mentions: Yasunori Sumi Tokyo Medical & Dental University National Center for Geriatrics and Gerontology in Japan
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  4. About National Center for Geriatrics and Gerontology in Japan

    National Center for Geriatrics and Gerontology in Japan

    National Center for Geriatrics and Gerontology (NCGG), established March 1, 2004, is the sixth highly specialized medical center of its kind in Japan. It was set up under the Ministry of Health, Welfare and Labor establishment law as an institute to diagnose, treat, survey and research specific diseases as well as to train health personnel.

  5. Related Topics

    1. Optical Coherence Tomography for In-vivo Assessment of Class-III Composite Restoration
      72 articles also mentioned Yasunori Sumi
    2. Hydration and Demineralization Effects on Reflectivity of Enamel Using SS-OCT
      11 articles also mentioned Syozi Nakashima