Table 1.
Tested materials divided in groups, their compositions, and marginal preparations. All the groups were tested as received by manufacturers and after simulated artificial chewing for 1 year.
| Group | Material | Composition | Preparation |
|---|---|---|---|
| G1a (n = 10) | NobelProcera Zirconia (Nobel Biocare) |
ZrO2 + Y2O3 + HfO2 > 99%, Y2O3 4.5-5.4%, HfO2 < 5%, Al2O3 < 0.5% | Feather-edge |
| G1b (n = 10) | Slight-chamfer | ||
| G1c (n = 10) | Deep-chamfer | ||
| G2a (n = 10) | LAVA Classic (3M ESPE) |
3 mol% Y-TZP + Al2O3 | Feather-edge |
| G2b (n = 10) | Slight-chamfer | ||
| G2c (n = 10) | Deep-chamfer | ||
| G3a (n = 10) | LAVA Plus (3M ESPE) |
3 mol% Y-TZP + Al2O3 0.1% + ionic staining components | Feather-edge |
| G3b (n = 10) | Slight-chamfer | ||
| G3c (n = 10) | Deep-chamfer |