1. Articles from Masahiro YOSHIYAMA

    1-7 of 7
    1. Assessment of Demineralization Inhibition Effects of Dentin Desensitizers Using Swept-Source Optical Coherence Tomography

      Assessment of Demineralization Inhibition Effects of Dentin Desensitizers Using Swept-Source Optical Coherence Tomography

      The purpose of this study was to evaluate the mechanism of action and the inhibiting effects of two types of desensitizers against dentin demineralization using pre-demineralized hypersensitivity tooth model in vitro. In this study, we confirmed that a hypersensitivity tooth model from our preliminary experiment could be prepared by immersing dentin discs in an acetic acid-based solution with pH 5.0 for three days. Dentin discs with three days of demineralization were prepared and applied by one of the desensitizers containing calcium fluoro-alumino-silicate glass (Nanoseal, NS) or fluoro-zinc-silicate glass (Caredyne Shield, CS), followed by an additional three days of demineralization ...

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

      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: 1—slight enamel wear; 2—distinct enamel wear; 3—tooth wear with slight dentin exposure; 4—tooth wear with distinct involvement of dentin. The degree of tooth wear was validated by the histological view of confocal laser ...

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

      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 structure beyond the range of light penetration depth are not relevant for OCT imaging. In OCT, sound enamel is almost transparent at the OCT wavelength range, and enamel and dentin ...

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    4. 3D imaging of proximal caries in posterior teeth using optical coherence tomography

      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 characteristic curve (AUC) for the diagnosis of enamel caries and dentin caries were calculated to quantify the diagnostic ability of 3D OCT in comparison with digital radiography. Diagnostic accuracy was ...

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    5. Diagnosis of Occlusal Caries with Dynamic Slicing of 3D Optical Coherence Tomography Images

      Diagnosis of Occlusal Caries with Dynamic Slicing of 3D Optical Coherence Tomography Images

      Detecting the extent of occlusal caries is a clinically important but challenging task required for treatment decision making. The aim of this study was to assess the diagnostic power of 3D swept-source optical coherence tomography (OCT) for evaluation of occlusal caries in comparison with X-ray radiography. Extracted human molars not exhibiting American Dental Association (ADA) criteria advanced caries were mounted in a silicone block and digital dental radiographs were captured from the buccal side. Subsequently, occlusal surfaces were scanned with a prototype Yoshida Dental OCT. Thirteen examiners evaluated the presence and extent of caries on radiographs and dynamically sliced 3D ...

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

      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 microcracks. Demineralization progression was divided into 4 types by depth: 0 for sound enamel and Type I, II, and III for enamel demineralization penetrating into the outer third, the middle ...

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

      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 CLSM; lesion depth (LD TMR ) and mineral loss (ML) were obtained from TMR. In vitro root caries under wet and dry conditions showed different OCT images and SI patterns. Lesion ...

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    1-7 of 7
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  2. Topics in the News

    1. (6 articles) Tokyo Medical & Dental University
    2. (6 articles) National Center for Geriatrics and Gerontology in Japan
    3. (6 articles) University of Washington
    4. (2 articles) Avinger
    5. (1 articles) University of Hong Kong
    6. (1 articles) Columbia University
    7. (1 articles) University of Erlangen
    8. (1 articles) University of Pennsylvania
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    Assessment of root caries under wet and dry conditions using swept-source optical coherence tomography (SS-OCT) Three-dimensional assessment of proximal contact enamel using optical coherence tomography Diagnosis of Occlusal Caries with Dynamic Slicing of 3D Optical Coherence Tomography Images 3D imaging of proximal caries in posterior teeth using optical coherence tomography Evaluation of dental caries, tooth crack, and age-related changes in tooth structure using optical coherence tomography Diagnosis of Occlusal Tooth Wear Using 3D Imaging of Optical Coherence Tomography Ex Vivo Assessment of Demineralization Inhibition Effects of Dentin Desensitizers Using Swept-Source Optical Coherence Tomography Portable Optical Coherence Elastography System With Flexible and Phase Stable Common Path Optical Fiber Probe Strategies to Improve Convolutional Neural Network Generalizability and Reference Standards for Glaucoma Detection From OCT Scans Automatic detection of retinopathy with optical coherence tomography images via a semi-supervised deep learning method Reduced Retinal Microvascular Perfusion in Patients With Stroke Detected by Optical Coherence Tomography Angiography Optical coherence tomography angiography findings in diabetic macular edema