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. 2018 Oct 30;13:347. doi: 10.1186/s11671-018-2768-y

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© The Author(s). 2018

Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.

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Fig. 9 — Profiles of nanoscratch tracks on the outer enamel of the normal tooth, mild dental fluorosis, and severe dental fluorosis and four restorative materials. Normal tooth enamel (NTE), mild dental fluorosis enamel (MFE), severe dental fluorosis enamel (SFE), IPS e.max CAD (IPS), polymer-infiltrated-ceramic network (PICN), Lava™ ultimate (LVU), and Fltek™ Z350XT (Z350)