Effect of hydration on assessment of early enamel lesion using swept-source optical coherence tomography

Authors

  • Amir Nazari,

    1. Cariology and Operative Dentistry, Department of Restorative Sciences, Tokyo Medical and Dental University, 1-5-45 Yushima, Bunkyo-ku, Tokyo 113-8549, Japan
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  • Alireza Sadr,

    Corresponding author
    1. Cariology and Operative Dentistry, Global Center of Excellence GCOE Program, IRCMSTBD, Tokyo Medical and Dental University, 1-5-45 Yushima, Bunkyo-ku, Tokyo 113-8549, Japan
    • Phone: 81-3-5803-5483, Fax: 81-3-5803-0195
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  • Marc Campillo-Funollet,

    1. SUNY at Buffalo, School of Dental Medicine, Department of Restorative Dentistry, Buffalo, NY, USA
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  • Syozi Nakashima,

    1. Cariology and Operative Dentistry, Department of Restorative Sciences, Tokyo Medical and Dental University, 1-5-45 Yushima, Bunkyo-ku, Tokyo 113-8549, Japan
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  • Yasushi Shimada,

    1. Cariology and Operative Dentistry, Department of Restorative Sciences, Tokyo Medical and Dental University, 1-5-45 Yushima, Bunkyo-ku, Tokyo 113-8549, Japan
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  • Junji Tagami,

    1. Cariology and Operative Dentistry, Department of Restorative Sciences, Tokyo Medical and Dental University, 1-5-45 Yushima, Bunkyo-ku, Tokyo 113-8549, Japan
    2. Cariology and Operative Dentistry, Global Center of Excellence GCOE Program, IRCMSTBD, Tokyo Medical and Dental University, 1-5-45 Yushima, Bunkyo-ku, Tokyo 113-8549, Japan
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  • Yasunori Sumi

    1. National Center for Geriatrics and Gerontology, Obu, Aichi 474-8522, Japan
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Abstract

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 (DH). A linear regression was found between DH and the square root of demineralization time (R2 = 0.99). Significant differences were found in DH between sound and demineralized enamel, and between different periods of demineralization (p < 0.001). Hydration state affects the reflectivity of demineralized porous enamel, and the effect can be potentially used for assessment of early enamel lesion using OCT. (© 2013 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim)

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