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Table 1.
Material properties
| Young’s modulus (MPa) | Poisson’s ratio | |
|---|---|---|
| Teeth | 19.6 × 103 | 0.3 |
| PDL | 0.67 | 0.45 |
| Bone | 13.7 × 103 | 0.3 |
| Clear aligner | 816 | 0.36 |
| Attachment | 12.5 × 103 | 0.36 |