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. 2020 May 6;99(8):914–921. doi: 10.1177/0022034520917675

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© The Author(s) 2020

This article is distributed under the terms of the Creative Commons Attribution-NonCommercial 4.0 License (https://creativecommons.org/licenses/by-nc/4.0/) which permits non-commercial use, reproduction and distribution of the work without further permission provided the original work is attributed as specified on the SAGE and Open Access page (https://us.sagepub.com/en-us/nam/open-access-at-sage).

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Figure 4. — Dental erosion prevention and safety of chitosan-catechol (Chi-C). (A) Erosion depth under different conditions by optical coherence tomography images. (B) The erosion depths were quantified from 3 different samples coated with secondary salivary conditioning film (S-SCF) treated with buffer, Chi-C_7.6%, Chi-C_14.5%, and Chi-C_22.4%, respectively. (C) Chi-C treatment of salivary conditioning film (SCF) caused higher L929 proliferation. Fluorescent images of L929 cells were stained with DAPI at days 1, 3, and 7. (D) Cell metabolic activity measured by XTT. Statistical differences are marked by *P < 0.05.