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. 2020 Mar 17;20(6):1659. doi: 10.3390/s20061659

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© 2020 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).

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Enamel caries: (A) 3D OCT image; (B) cross-sectional OCT image along the red line in (A). Arrow shows a wedge-shaped area with increased scattering approximately half the thickness of the enamel, indicating demineralization with no surface breakdown; (C) photographic presentation of occlusal enamel with stained fissure (arrow); (D) OCT en face intensity projection; (E) radiograph showed no visible lesion; (F) cross-section view with shallow enamel dye penetration confirming demineralization without surface breakdown (score 1). The dynamic slicing 3D video is presented in Supplementary Materials: Video 2.