1. Yasunori Sumi

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    1. Mentioned In 75 Articles

    2. Noninvasive Cross-Sectional Visualization of Enamel Cracks by Optical Coherence Tomography In Vitro

      Noninvasive Cross-Sectional Visualization of Enamel Cracks by Optical Coherence Tomography In Vitro
      Introduction Current methods for the detection of enamel cracks are not very sensitive. Optical coherence tomography (OCT) is a promising diagnostic method for creating cross-sectional imaging of internal biological structures by measuring echoes of backscattered light. In this study, swept-source OCT (SS-OCT), a variant of OCT that sweeps the near-infrared wavelength at a rate of 30 kHz over a span of 110 nm centered at 1,330 nm, was examined ...
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    3. Effect of hydration on assessment of early enamel lesion using swept-source optical coherence tomography

      Effect of hydration on assessment of early enamel lesion using swept-source optical coherence tomography
      Establishing reproducible methodologies for assessment of early enamel lesions using optical coherence tomography (OCT) appears to be challenging. This in vitro study longitudinally evaluated the subsurface enamel lesion progression after 3, 9 and 15 days by cross-sectional scanning using 1310 nm centered swept-source OCT (SS-OCT) under hydrated and dry conditions. The positive difference between the depth-integrated OCT signals at dry and hydrated conditions were calculated and adopted as dehydration parameter ...
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    4. Noninvasive cross-sectional imaging of incomplete crown fractures (cracks) using swept-source optical coherence tomography

      Noninvasive cross-sectional imaging of incomplete crown fractures (cracks) using swept-source optical coherence tomography
      Aim:  To investigate the ability of swept-source optical coherence tomography (SS-OCT) to detect incomplete crown fractures (cracks) in extracted teeth. Methodology:  Cracks were created by subjecting 30 porcine premolars to impaction by a steel rod plunging from the occlusal tip. SS-OCT images and stereomicroscopic photographs of the surface were acquired for each specimen before and after impaction. For evaluation, the focused light beam of SS-OCT was projected from 3 directions ...
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    5. Effects of structural orientation of enamel and dentine on light attenuation and local refractive index: An optical coherence tomography study

      Effects of structural orientation of enamel and dentine on light attenuation and local refractive index: An optical coherence tomography study
      ...l the corresponding author ^, E-mail the corresponding author , * Yasushi Shimada^a, * Junji Tagami^a^, ^b, * Yasunori Sumi^c * ^a Cariology and Operative Dentistry, Department of Restorative Sciences, Tokyo Medical...
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    6. Relationship between refractive index and mineral content of enamel and dentin using SS-OCT and TMR

      Relationship between refractive index and mineral content of enamel and dentin using SS-OCT and TMR
      The aim of this work was to investigate relationship between refractive index (n) and mineral content (MC) (vol %) of enamel and dentin using swept-source optical coherence tomography (SS-OCT) and transverse microradiography (TMR). Enamel and dentin blocks were partitioned into three regions. The middle partition of each sample was covered with a nail polish to protect the sound area during exposure to the treatment solutions. Samples were demineralized in a demineralizing ...
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    7. Longitudinal assessment of subsurface artificial root caries lesions by optical coherence tomography in comparison with transverse microradiography

      Longitudinal assessment of subsurface artificial root caries lesions by optical coherence tomography in comparison with transverse microradiography
      We previously demonstrated that a swept-source optical coherence tomography system (SS-OCT) without polarization-sensing could quantitatively estimate the progress of cavitated dentin lesions in vitro. The purpose of the current study was to investigate the ability to estimate the lesion development in non-cavitated dentin lesions with a surface layer. Bovine root dentin specimens were subjected to different periods of demineralization (1 to 14 days). Cross-sectional images of the specimens before and ...
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    8. Non-destructive assessment of cavity wall adaptation of class V composite restoration using swept-source optical coherence tomography

      Non-destructive assessment of cavity wall adaptation of class V composite restoration using swept-source optical coherence tomography
      Abstract: The purpose of this study was to evaluate gap formations under class V restoration using swept-source optical coherence tomography (SS-OCT). Wedge-shaped cavities were prepared on the buccal surface of 40 extracted premolar teeth at 2 locations; 1) cemento-enamel junction (CEJ) with enamel and cementum margin and 2) root surfaces with cementum margin. The cavity was treated with Clearfil S3 Bond, restored with Clearfil Majesty and polished with abrasive disks ...
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    9. Estimation of lesion progress in artificial root caries by swept source optical coherence tomography in comparison to transverse microradiography

      Estimation of lesion progress in artificial root caries by swept source optical coherence tomography in comparison to transverse microradiography
      ...tated dentin lesions in vitro. Yuko Natsume, Syozi Nakashima, Alireza Sadr, Yasushi Shimada, Junji Tagami and Yasunori Sumi, "Estimation of lesion progress in artificial root caries by swept source optical coherence tomo...
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    10. Non-invasive quantification of resin–dentin interfacial gaps using optical coherence tomography: Validation against confocal microscopy

      Non-invasive quantification of resin–dentin interfacial gaps using optical coherence tomography: Validation against confocal microscopy
      ... The Corresponding Author ^, ^E-mail The Corresponding Author , Yasushi Shimada^a, Junji Tagami^a^, ^b and Yasunori Sumi^c ^a Cariology and Operative Dentistry, Graduate School of Medical and Dental Sciences, Tokyo Me...
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    11. Non-destructive 3D imaging of composite restorations using optical coherence tomography: marginal adaptation of self-etch adhesives

      Non-destructive 3D imaging of composite restorations using optical coherence tomography: marginal adaptation of self-etch adhesives
      Objectives To investigate the potential use of swept-source optical coherence tomography (SS-OCT) as a new tool to evaluate marginal adaptation of composite restorations in class I cavities. Methods Round-shaped class I cavities (3 mm diameter x 1.5 mm depth) were prepared on buccal enamel of bovine teeth with cavity floor located in dentin. The cavities were restored with a flowable resin composite (Clearfil Majesty LV) using two-step self-etch adhesive ...
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    12. 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 ...
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    13. Panasonic Developing Swept Source Optical Coherence Tomography System for Dental Applications

      Panasonic Developing Swept Source Optical Coherence Tomography System for Dental Applications
      ...oping an Swept Source OCT system designed for dental purposes, in collaboration with researchers led by Prof. Yasunori Sumi form National Center for Geriatrics and Gerontology, Japan and Prof. Junji Tagami, Global COE, T...
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    14. Local Refractive Index of Human Enamel and Dentin by OCT

      Local Refractive Index of Human Enamel and Dentin by OCT
      Objectives: The aim of this study was to evaluate Swept Source Optical Coherence Tomography (SS-OCT) for measuring Refractive Index of sound Enamel and Dentin at different locations. Materials & Method: Enamel and Dentin slabs (300µm-thick) were sectioned to obtain enamel prisms cross-cut or long-cut and dentin with tubule orientations parallel, oblique or perpendicular to the cutting surface. Each slice was fine polished under running water, and then each placed on a ...
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    15. Marginal Adaptation of Self-Etch Adhesives by 3D Optical Coherence Tomography

      Marginal Adaptation of Self-Etch Adhesives by 3D Optical Coherence Tomography
      Objectives: The aim of this study was to investigate Swept Source Optical Coherence Tomography (SS-OCT) as a new tool to evaluate marginal adaptation of enamel and dentin restorations. Materials and Methods: Round-shaped class I cavities (3mm diameter, 1.5mm depth) were prepared on the buccal enamel of bovine teeth with the floor located in dentin. The cavities were restored with a flowable resin composite (Clearfil Majesty LV) using two-step self-etch ...
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    16. 46-60 of 75 « 1 2 3 4 5 »
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  2. About Yasunori Sumi

    Yasunori Sumi, DDS, is the Director at the Division of Oral and Dental Surgery, Department of Advanced Medicine, National Hospital for Geriatric Medicine, National Center for Geriatrics and Gerontology, Japan.