1. Syozi Nakashima

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    1-13 of 13
    1. Mentioned In 13 Articles

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

      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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    3. Microgaps and Demineralization Progress around Composite Restorations

      Microgaps and Demineralization Progress around Composite Restorations
      This study investigated the influence of adhesives and marginal sealing on demineralization progress using optical coherence tomography (OCT). Cavities (4 2 mm) were prepared in bovine incisors and restored using Clearfil SE Protect (SP), Bond Force (BF), Scotchbond Universal (SB), or G-Bond Plus (GB), followed by Estelite Flow Quick flowable composite. The control group received no adhesive ( n = 10). After 3-d incubation in artificial saliva and 10,000 thermal cycles ...
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    4. Clinical assessment of non carious cervical lesion using swept-source optical coherence tomography

      Clinical assessment of non carious cervical lesion using swept-source optical coherence tomography
      ( A ) We determined the attenuation coeffcient ( t ) threshold of SS-OCT signal for the detection of demineralization (1.21) from in vitro study. DEM: demineralized dentin, sound: sound dentin. ( B ) Using the t threshold, we observed NCCLs in vivo to detect the demineralization in cervical dentin. SS-OCT scanning was performed along the red line. ( C ) SS-OCT image obtained along the red line in B. In SS-OCT, brightness of dentin beneath the ...
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    5. 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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    6. 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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    7. 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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    8. 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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    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
      ...uantitative estimation of lesion depth and mineral loss with cavitated dentin lesions in vitro. Yuko Natsume, Syozi Nakashima, Alireza Sadr, Yasushi Shimada, Junji Tagami and Yasunori Sumi, "Estimation of lesion progress...
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    10. Demineralization Affects Refractive Indices of Human Enamel and Dentin

      Demineralization Affects Refractive Indices of Human Enamel and Dentin
      Objectives: Dental hard tissues and biomaterials can be non-destructively assessed using optical coherence tomography (OCT), an emerging diagnostic tool. Swept Source (SS)-OCT has an improved imaging resolution and speed. Depth resolved data obtained in B-scans can be used to assess the quality and depth-resolved information on the tissues. The measurements are affected by the optical properties of the tissue, such as refractive index (RI). The aim of this study ...
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    11. Hydration and Demineralization Effects on Reflectivity of Enamel Using SS-OCT

      Hydration and Demineralization Effects on Reflectivity of Enamel Using SS-OCT
      Objective: The aim of this study was to determine the effect of hydration in assessment of reflectivity and depth measurements of demineralised enamel lesion using Swept-source Optical Coherence Tomography (SS-OCT). Methods: Bovine enamel blocks were used. B-scans of all specimens were obtained and recorded as reference using SS-OCT (OCT2000, Santec, Japan). The specimens were kept in a demineralizing solution adjusted at pH 4.8 at 37degrees-C. After 3, 9 and ...
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  2. About Syozi Nakashima

    Syozi Nakashima is at the Cariology and Operative Dentistry, Department of Restorative Sciences, Tokyo Medical and Dental University.