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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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Sound enamel. (A) gray-scale three-dimensional (3D) OCT image; (B) cross-sectional OCT image along the red line in (A) and (D) with intact enamel with bright band across the fissure base extending over the cusps (arrow), suggesting a developmental feature (not acquired caries); (C) photographic presentation of occlusal enamel with seemingly intact fissure (arrow); (D) OCT en face intensity projection; (E) radiograph; (F) cross-sectional photograph with no dye at the observed fissure (arrow) confirming sound surface (score 0). The dynamic slicing 3D video is presented in Supplementary Materials: Video 1.