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. 2021 Dec 21;14(1):14. doi: 10.3390/polym14010014

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© 2021 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 (https://creativecommons.org/licenses/by/4.0/).

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Colorimetric measurements of the considered aligners after 7 and 14 days of immersion into different staining solutions: (a) Erkodur (EK), (b) Essix Plastic (EP), (c) Ghost Aligner (GA), (d) Zendura (ZN) and (e) Invisalign (IL).