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Means and standard deviations of nanoindentation hardness values obtained for soft particles and the enamel surface
| Property | Enamel (n = 25) | Al (n = 17) | Brass (n = 20) |
| Hardness, GPa | 4.62 (0.14) | 1.29 (0.078) | 2.60 (0.15) |
| Data range | 4.33–4.99 | 1.20–1.40 | 2.26–2.91 |
Here, n denotes number of measurements.
