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Comparison between SEM micrographs of Zendura (ZN) aligner before and after 2 weeks of immersion into staining beverages; (a) as-received sample; (b) sample immersed into artificial saliva (A); (c) sample immersed into nicotine (B); (d) sample immersed into red wine (C); (e) sample immersed into coffee (D).
