1. Yasunori Sumi

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    1. Mentioned In 73 Articles

    2. Nondestructive assessment of current one-step self-etch dental adhesives using optical coherence tomography

      Nondestructive assessment of current one-step self-etch dental adhesives using optical coherence tomography
      This study aimed to nondestructively evaluate sealing performance of eight one-step self-etch adhesives (1-SEAs) using optical coherence tomography (OCT). The two-step self-etch adhesive (2-SEA) served as the control. Round tapered class-I cavities ( D = 4 mm , H = 2 mm ) were prepared in bovine incisors, treated with each adhesive ( n = 5 ), and restored with a flowable resin composite. Cross-sections were obtained from each restoration using swept-source OCT with 1310-nm laser. The average ...
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    3. Symposium on Dental OCT June 20th 2013 in Tokyo, Japan.

      Symposium on Dental OCT June 20th 2013 in Tokyo, Japan.
      Tokyo Medial and Dental University will hold a special symposium in Tokyo on June 20 (Thu) on the development and application of Optical Coherence Tomography in Dentistry. The symposium is sponsored by Tokyo Medical and Dental University, and some of the pioneers of dental OCT from Japan and US will talk about the latest developments in the field (see the list of speakers at http://www.tmdu.net/oct/ ) . All ...
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    4. Monitoring remineralization of enamel subsurface lesions by optical coherence tomography

      Monitoring remineralization of enamel subsurface lesions by optical coherence tomography
      Optical coherence tomography (OCT) is a potential clinical tool for enamel lesion monitoring. Swept-source OCT findings were compared with cross-sectional nanohardness findings of enamel. Subsurface bovine enamel lesions in three groups were subjected to (1) deionized water (control), (2) phosphoryl oligosaccharide of calcium (POs-Ca) or (3) POs-Ca with 1 ppm fluoride for 14 days. B-scans images were obtained at 1310-nm center wavelength on sound, demineralized and remineralized areas after 4 ...
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    5. Non-invasive assessment of corneal crosslinking changes using polarization sensitive optical coherence tomography

      Non-invasive assessment of corneal crosslinking changes using polarization sensitive optical coherence tomography
      Collagen crosslinking (CXL) has shown promising results in the prevention of the progression of keratoconus and corneal ectasia. However, techniques for in vivo and in situ assessment of the treatment are limited. In this study, ex vivo porcine eyes were treated with a chemical CXL agent (glutaraldehyde), during which polarization sensitive optical coherence tomography (PS-OCT) recordings were acquired simultaneously to assess the sensitivity of the technique to assess changes in ...
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    6. 3D Assessment of Void and Gap Formation in Flowable Resin Composites Using Optical Coherence Tomography

      3D Assessment of Void and Gap Formation in Flowable Resin Composites Using Optical Coherence Tomography
      Purpose: To investigate the effect of composite type and cavity size on gap and void formation using optical coherence tomography (OCT). Materials and Methods: Class I cavities of two depths (2 mm or 4 mm; 4 mm diameter) were prepared, treated with Tri-S Bond (Kuraray Medical), and bulk filled with either Surefil SDR Flow (SF; Dentsply) or Clearfil Majesty LV (MJ; Kuraray Medical) to form four groups. After 24 h ...
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    7. Noninvasive cross-sectional imaging of proximal caries using swept-source optical coherence tomography (SS-OCT) in vivo

      Noninvasive cross-sectional imaging of proximal caries using swept-source optical coherence tomography (SS-OCT) in vivo
      The aim of this study was to determine the diagnostic accuracy of swept-source optical coherent tomography (SS-OCT) in detecting and estimating the depth of proximal caries in posterior teeth in vivo. SS-OCT images and bitewing radiographs were obtained from 86 proximal surfaces of 53 patients. Six examiners scored the locations according to a caries lesion depth scale (04) using SS-OCT and the radiographs. The results were compared with clinical observations ...
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    8. Detection of Root Surface Fractures with Swept-Source Optical Coherence Tomography (SS-OCT)

      Detection of Root Surface Fractures with Swept-Source Optical Coherence Tomography (SS-OCT)
      Objective: The purpose of this study was to compare optical coherence tomography (OCT) with the existing technologies, to assess its accuracy and utility in detecting vertical root fractures of extracted human teeth. Background data: The detection of root fractures in teeth that have undergone root canal treatment is challenging because of the great difficulty in differentiating these fractures from morphologic or radiographic anomalies. OCT methods are based on depth-resolved optical ...
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    9. Non-destructive characterization of voids in six flowable composites using swept-source optical coherence tomography

      Non-destructive characterization of voids in six flowable composites using swept-source optical coherence tomography
      ... Ali Saghiri^c, * Marc Campillo-Funollet^e, * Hidenori Hamba^a, * Yasushi Shimada^a, * Junji Tagami^a^, ^d, * Yasunori Sumi^f * ^a Cariology and Operative Dentistry, Graduate School of Medical and Dental Sciences, Tokyo ...
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    10. Validation of swept source optical coherence tomography (SS-OCT) for the diagnosis of smooth surface caries in vitro

      Validation of swept source optical coherence tomography (SS-OCT) for the diagnosis of smooth surface caries in vitro
      Objective An accurate evaluation of the extent of dental caries and possible progress of the lesion from enamel into dentin is very important in clinical dentistry. Dentists need an imaging technology that can noninvasively and reliably quantify the extent of caries. This study aimed to evaluate the effectiveness of non-polarized swept source optical coherence tomography (OCT) in evaluating the extent of caries on smooth enamel surfaces. Methods One-hundred and twenty-seven ...
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    11. Estimation of the Enamel and Dentin Mineral Content from the Refractive Index

      Estimation of the Enamel and Dentin Mineral Content from the Refractive Index
      Recent advances in the field of optics have enabled accurate and localized measurement of optical properties of biological substrates. This work aimed to elucidate the relationship between the local refractive index ( n ) and mineral content (MC) of enamel and dentin. De- and remineralized lesions in bovine enamel and dentin blocks were sectioned into 300- to 400-m-thick slices, and placed on a metal plate to capture images of sound, de- and ...
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    12. Concurrent Evaluation of Composite Internal Adaptation and Bond Strength in a Class-I Cavity

      Concurrent Evaluation of Composite Internal Adaptation and Bond Strength in a Class-I Cavity
      Objectives This study investigated class-I cavity floor adaptation by swept-source optical coherence tomography (OCT) in combination with microtensile bond strength (MTBS) using different filling methods. Methods Two adhesive systems; Tokuyama Bond Force and Tri-S Bond Plus were used in conjunction with a universal composite (Estelite Sigma Quick) placed either incrementally (oblique) or in bulk with or without a flowable composite lining (Palfique Estelite LV). Ten serial B-scan images were obtained ...
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    13. 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
      ..., Corresponding author contact information ^, E-mail the corresponding author , * Alireza Sadr, DDS, PhD^†, * Yasunori Sumi, DDS, PhD^‡, * Junji Tagami, DDS, PhD^∗^, ^† * ^∗ Department of Restorative Sciences, Graduate S...
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    14. 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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    15. 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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    16. 31-45 of 73 « 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.