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| Groups | No preheating | Preheating |
|---|---|---|
| Universal Restorative | 64.21 (1.60) a, B | 70.08 (1.41) a, A |
| Filtek Supreme Ultra | 54.66 (2.32) b, B | 58.13 (1.04) b, A |
* Tukey’s post-hoc test: different capital letters in the same row indicate a statistically significant differences. Different lowercase letters in the same column indicate statistically significant differences. Standard deviation in parentheses.
