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

Figure 1.

Figure 1

XRD patterns of the considered aligners: (a) Erkodur (EK); (b) Essix Plastic (EP); (c) Ghost Aligner (GA); (d) Zendura (ZN); (e) Invisalign (IL).