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Table 4 Hardness, elastic modulus and degraded layer thickness of the different samples of femoral heads in relation to the in vivo times after implantation

From: Comparison of zirconia degradation in dental implants and femoral balls: an X-ray diffraction and nanoindentation study

In vivo time (h) Hardness (GPa) Average stiffness (N/mm) Elastic modulus (GPa) Ec* Degraded layer thickness (μm)
0 16.7 ± 0.6 110 ± 9 247.8 ± 12.3 0
1124 15.8 ± 0.4 105 ± 7 243.9 ± 11.0 20 ± 8
2207 15.2 ± 0.5 100 ± 10 240.7 ± 10.1 160 ± 29
2507 14.5 ± 0.6 95 ± 9 238.6 ± 13.1 390 ± 50
3120 14.0 ± 0.8 96 ± 7 230.0 ± 10.0 709 ± 95
3789 13.3 ± 0.4 88 ± 9 224.1 ± 12.8 1300 ± 201
4123 13.1 ± 0.4 87 ± 4 216.2 ± 10.9 1800 ± 301
5120 12.0 ± 0.8 84 ± 7 207.8 ± 12.7 3807 ± 278
5350 12.2 ± 0.4 83 ± 9 202.3 ± 14.8 5099 ± 413
5888 11.8 ± 0.8 81 ± 8 201.8 ± 10.8 5308 ± 555