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Journal of Medical Imaging

Assessment of natural enamel lesions with optical coherence tomography in comparison with microfocus x-ray computed tomography
Author(s): Jorge Espigares; Alireza Sadr; Hidenori Hamba; Yasushi Shimada; Masayuki Otsuki; Junji Tagami; Yasunori Sumi
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Paper Abstract

A technology to characterize early enamel lesions is needed in dentistry. Optical coherence tomography (OCT) is a noninvasive method that provides high-resolution cross-sectional images. The aim of this study is to compare OCT with microfocus x-ray computed tomography (μCT) for assessment of natural enamel lesions in vitro. Ten human teeth with visible white spot-like changes on the enamel smooth surface and no cavitation (ICDAS code 2) were subjected to imaging by μCT (SMX-100CT, Shimadzu) and 1300-nm swept-source OCT (Dental SS-OCT, Panasonic Health Care). In μCT, the lesions appeared as radiolucent dark areas, while in SS-OCT, they appeared as areas of increased signal intensity beneath the surface. An SS-OCT attenuation coefficient based on Beer–Lambert law could discriminate lesions from sound enamel. Lesion depth ranged from 175 to 606  μm in SS-OCT. A correlation between μCT and SS-OCT was found regarding lesion depth (R=0.81, p<0.001) and also surface layer thickness (R=0.76, p<0.005). The images obtained clinically in real time using the dental SS-OCT system are suitable for the assessment of natural subsurface lesions and their surface layer, providing comparable images to a laboratory high-resolution μCT without the use of x-ray.

Paper Details

Date Published: 11 February 2015
PDF: 8 pages
J. Med. Imag. 2(1) 014001 doi: 10.1117/1.JMI.2.1.014001
Published in: Journal of Medical Imaging Volume 2, Issue 1
Show Author Affiliations
Jorge Espigares, Tokyo Medical and Dental Univ. (Japan)
Alireza Sadr, Univ. of Washington School of Dentistry (United States)
Tokyo Medical and Dental Univ. (Japan)
Hidenori Hamba, Tokyo Medical and Dental Univ. (Japan)
Yasushi Shimada, Tokyo Medical and Dental Univ. (Japan)
Masayuki Otsuki, Tokyo Medical and Dental Univ. (Japan)
Junji Tagami, Tokyo Medical and Dental Univ. (Japan)
Yasunori Sumi, National Ctr. for Geriatrics and Gerontology (Japan)

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