Table 2. Nano-hardness of composite materials used in this study.
| Material | Nano-hardness (GPa) |
|---|---|
| Estelite Flow Quick | 0.303 (0.062) |
| Esthet X | 0.657 (0.076) |
| Filtek Supreme Plus | 0.873 (0.107) |
| Z100 | 1.101 (0.256) |
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