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. 2022 Feb 4;9:rbac007. doi: 10.1093/rb/rbac007

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© The Author(s) 2022. Published by Oxford University Press.

This is an Open Access article distributed under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0/), which permits unrestricted reuse, distribution, and reproduction in any medium, provided the original work is properly cited.

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Figure 3. — Characterization of TPU as the raw material of the clear aligners. (A) ¹H NMR spectrum of TPU in DMSO-d₆ and DSC curves (the cooling down curve and the second heating up curve) of the clear aligner film material. (B) The mechanical tests of the clear aligner film material: tensile test, stress-relaxation test, three-point bending test and right-angle tearing test.