1. Articles from Nobuyoshi Ozawa

    1-7 of 7
    1. Method and apparatus for measuring and displaying dental plaque, gingiva, and alveolar bone

      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, generating an optical coherence tomographic image based on a scattering intensity value of the interference light, extracting a dental plaque region having a specific scattering intensity value from the optical ...

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    2. Method and apparatus for measuring and displaying dental plaque

      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, generating an optical coherence tomographic image based on a scattering intensity value of the interference light, extracting a dental plaque region having a specific scattering intensity value from the optical ...

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    3. Swept-source optical coherence tomography as a new tool to evaluate defects of resin-based composite restorations

      Swept-source optical coherence tomography as a new tool to evaluate defects of resin-based composite restorations
      Objectives : Current diagnostic imaging modalities for resin-based composites (RBC) do not possess sufficient resolution and cross-sectional tomographic imaging to detect defects of RBC restorations in real-time. The purpose of this in vivo study was to investigate swept-source optical coherence tomography (SS-OCT) as a new tool to evaluate defects of RBC restorations. Methods : We evaluated for the failure of RBC restorations in 52 patients (11 male, 41 female) at the Division of Oral and Dental Surgery, National Center for Geriatrics and Gerontology, Japan. SS-OCT images of the 132 RBC restorations were obtained in order to investigate their marginal adaptation, porosity and ...
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    4. Application of optical coherence tomography (OCT) to nondestructive inspection of dentures

      Application of optical coherence tomography (OCT) to nondestructive inspection of dentures
      The porosity of denture base resins continues to be one of the undesirable characteristics of acrylic resins. It is commonly accepted that porosity of the denture not only often leads to denture fractures, but also may function as a reservoir of potential pathogens. The purpose of this study was to present the first OCT images of finished dentures using a new advanced-type OCT scanner we have developed, and to discuss the application of our new OCT system for nondestructive inspection of dentures. Ten newly fabricated full dentures of outpatient of the National Center for Geriatrics and Gerontology in Japan were ...
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    5. Validation of swept-source optical coherence tomography (SS-OCT) for the diagnosis of occlusal caries

      Validation of swept-source optical coherence tomography (SS-OCT) for the diagnosis of occlusal caries
      Objectives Detection of pit and fissure caries by current methods is not highly sensitive. In this laboratory study, we examined the use of a swept-source optical coherence tomography (SS-OCT) as a diagnostic tool for occlusal caries. Methods One-hundred and eleven investigation sites of occlusal fissures were selected from 62 extracted teeth and examined visually using conventional dental equipment without any magnification. SS-OCT observations were carried out on the same locations as where the conventional examination had been performed. The teeth were then sectioned using a diamond saw and directly viewed under a confocal laser scanning microscope (CLSM). Presence and extent ...
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    6. In vivo imaging of human labial glands using advanced optical coherence tomography

      Objective Optical coherence tomography (OCT) has emerged as a high-resolution noninvasive clinical imaging application. The purpose of this study was to show OCT images of human labial glands obtained using a swept-source (SS) OCT system. Study design Labial gland OCT imaging was carried out using our new SS-OCT system for 5 healthy volunteers using a hand-held in vivo OCT scanning probe. The labial tissue was scanned in a superior to inferior direction in 2 and 3 dimensions. Results The resulting 2- and 3-dimensional ultrahigh-resolution images of in vivo OCT human labial minor salivary glands revealed the epithelium, connective tissue, lobes ...
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    7. Evaluation of oral vascular anomalies using optical coherence tomography

      Optical coherence tomography (OCT) is a new method of biomedical imaging that can generate high-resolution, cross-sectional images of microstructures. The purpose of this study was to present the first OCT images of oral vascular anomalies using a new advanced OCT scanner that we have developed, and to discuss the application of our system for oral soft tissues. Knowledge of the size and area of the vascular structures can be useful for the diagnosis and choice of the best treatment. Before excision, oral vascular malformations were assessed by OCT in vivo. Histopathological sections were taken and compared with the OCT images ...
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    1-7 of 7
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  2. Topics in the News

    1. (7 articles) Nobuyoshi Ozawa
    2. (7 articles) Yasunori Sumi
    3. (6 articles) National Center for Geriatrics and Gerontology in Japan
    4. (5 articles) Tokyo Medical & Dental University
    5. (2 articles) Changho Chong
    6. (2 articles) Tohru Kurabayashi
    7. (2 articles) Santec
    8. (1 articles) University of Melbourne
    9. (1 articles) Alireza Sadr
    10. (1 articles) Kazuo Shimozato
    11. (1 articles) University of Washington
    12. (1 articles) University of Melbourne
    13. (1 articles) Dresden University of Technology
    14. (1 articles) University of Bonn
    15. (1 articles) Julia Walther
    16. (1 articles) Frank G. Holz
    17. (1 articles) Edmund Koch
    18. (1 articles) Steffen Schmitz-Valckenberg
    19. (1 articles) Abbot
    20. (1 articles) Avinger
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    Validation of swept-source optical coherence tomography (SS-OCT) for the diagnosis of occlusal caries Application of optical coherence tomography (OCT) to nondestructive inspection of dentures Swept-source optical coherence tomography as a new tool to evaluate defects of resin-based composite restorations Method and apparatus for measuring and displaying dental plaque Method and apparatus for measuring and displaying dental plaque, gingiva, and alveolar bone Carotid Disease and Retinal Optical Coherence Tomography Angiography Parameters in Type 2 Diabetes: The Fremantle Diabetes Study Phase II Retinal Vascular Density on Optical Coherence Tomography Angiography and Age-related Central and Peripheral Hearing Loss in a Southern Italian Older Population Optical coherence tomography outcomes from SPRINT-MS, a multicenter, randomized, double-blind trial of ibudilast in progressive multiple sclerosis Microvascular alterations in children with optic disk drusen evaluated by optical coherence tomography angiography Polarization sensitive optical coherence tomography for imaging microvascular information within living tissue without polarization-induced artifacts Validation of an Automated Quantification of Relative Ellipsoid Zone Reflectivity on Spectral Domain-Optical Coherence Tomography Images In Vivo Endoscopic Optical Coherence Tomography of the Healthy Human Oral Mucosa: Qualitative and Quantitative Image Analysis