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Linear regression analysis comparing Young’s modulus of elasticity between the five groups (with Essix C + as a comparator)
| Young’s modulus | Coefficient | P value | 95% confidence interval | |
|---|---|---|---|---|
| Essix C + (base comparison) | Reference | |||
| Duran 1 | 334.6 | 0.09 | − 64.20 | 733.34 |
| Duran 1.5 | 705.8 | < 0.01 | 307.04 | 1104.58 |
| Vivera | 1044.6 | < 0.01 | 645.84 | 1443.38 |
| Zendura | 333.9 | 0.09 | − 64.88 | 732.66 |
