Table 1.
Percent of the cell viability of tetragonal zirconia, cubic zirconia, lithium disilicate, zirconia-reinforced lithium silicate, and hybrid-ceramic samples after 24, 72, and 168 h
| Time (h) | Groups | Mean | SD | 95% CI for mean | |
|---|---|---|---|---|---|
|
| |||||
| Lower bound | Upper bound | ||||
| 24 | TZr | 57.90a | 13.93 | 23.30 | 92.49 |
| CZr | 49.13a | 3.00 | 41.67 | 56.59 | |
| LDS | 49.00a | 3.02 | 41.20 | 56.51 | |
| ZLS | 64.90a | 10.97 | 37.63 | 92.16 | |
| HyC | 52.63a | 5.25 | 39.59 | 65.67 | |
| 72 | TZr | 68.60a | 1.73 | 64.29 | 72.91 |
| CZr | 61.30a,b | 11.20 | 33.48 | 89.11 | |
| LDS | 75.87a | 5.02 | 63.38 | 88.35 | |
| ZLS | 45.97b | 11.30 | 17.88 | 74.88 | |
| HyC | 74.33a | 5.46 | 60.76 | 87.90 | |
| 168 | TZr | 51.50a | 3.81 | 42.03 | 60.97 |
| CZr | 64.7a | 3.60 | 55.75 | 73.65 | |
| LDS | 55.67a | 10.43 | 29.76 | 81.57 | |
| ZLS | 55.05a | 9.91 | 29.60 | 80.80 | |
| HyC | 46.50a | 3.34 | 38.20 | 54.80 | |
The groups with different lowercase letters showed significant statistical differences in each studied time (P<0.05; Tukey HSD). TZr: Tetragonal zirconia; CZr: Cubic zirconia; LDS: Lithium disilicate; ZLS: Zirconia-reinforced lithium silicate; HyC: Hybrid ceramic; HSD: Honest significant difference; CI: Confidence interval; SD: Standard deviation