Assessment of natural enamel lesions with optical coherence tomography in comparison with microfocus X-ray computed tomography

Jorge Espigares, Alireza Sadr, Hidenori Hamba, Yasushi Shimada, Masayuki Otsuki, Junji Tagami, Yasunori Sumi

Research output: Contribution to journalArticle

19 Citations (Scopus)

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.

Original languageEnglish
Article number014001
JournalJournal of Medical Imaging
Volume2
Issue number1
DOIs
Publication statusPublished - Jan 1 2015
Externally publishedYes

Keywords

  • X-ray imaging
  • dentistry
  • enamel
  • optical coherence tomography
  • optical properties
  • tissue characterization

ASJC Scopus subject areas

  • Radiology Nuclear Medicine and imaging

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