Table 4.
Comparison of internal and marginal discrepancies (μm) between different groups
| Internal discrepancy | Mean | Std. Deviation | Std. Error Mean | 95% Confidence Interval of the Difference | P-Value | ||
| Lower | Upper | ||||||
| Pair 1 | Vita—Nacera | 13.87500 | 8.48712 | 2.68386 | 7.80368 | 19.94632 | 0.001 |
| Pair 2 | Nacera—Zirconia | -31.02500 | 5.10508 | 1.61437 | -34.67695 | -27.37305 | 0.000 |
| Pair 3 | Zirconia—PEKK | 19.73750 | 5.61757 | 1.77643 | 15.71893 | 23.75607 | 0.000 |
| Pair 4 | Vita—PEKK | 2.58750 | 7.32719 | 2.31706 | -2.65405 | 7.82905 | 0.293 |
| Pair 5 | Vita—Zirconia | -17.15000 | 7.55370 | 2.38869 | -22.55359 | -11.74641 | 0.000 |
| Pair 6 | Nacera—PEKK | -11.28750 | 4.19327 | 1.32603 | -14.28718 | -8.28782 | 0.000 |
| Marginal discrepancy | Mean | Std. Deviation | Std. Error Mean | 95% Confidence Interval of the Difference | P-Value | ||
| Lower | Upper | ||||||
| Pair 1 | Vita – Zirconia | -16.10000 | 15.68403 | 4.95973 | -27.31968 | -4.88032 | 0.010 |
| Pair 2 | Vita—PEKK | 8.07500 | 14.43282 | 4.56406 | -2.24962 | 18.39962 | 0.111 |
| Pair 3 | Vita—Nacera | 4.17500 | 11.54704 | 3.65149 | -4.08525 | 12.43525 | 0.282 |
| Pair 4 | Zirconia—PEKK | 24.17500 | 4.45666 | 1.40932 | 20.98690 | 27.36310 | 0.000 |
| Pair 5 | Zirconia—Nacera | 20.27500 | 7.98823 | 2.52610 | 14.56057 | 25.98943 | 0.000 |
| Pair 6 | PEKK—Nacera | -3.90000 | 8.54010 | 2.70062 | -10.00922 | 2.20922 | 0.183 |