The microtensile bond strengths after 24 h and 6 m of the experimental groups and control group (MPa, x̄ ± s, n = 9)a.
| Groups | 24 h | 6 m |
|---|---|---|
| U55% | 28.56 ± 0.73Ac | 25.88 ± 2.94Bb |
| U60% | 31.79 ± 2.22Ab,c | 27.66 ± 4.01Ba,b |
| U65% | 39.00 ± 1.82Aa | 28.51 ± 4.11Ba,b |
| U70% | 35.80 ± 1.21Aa,b | 33.79 ± 2.31Aa |
| SB2 | 26.53 ± 2.75Ad | 21.91 ± 2.92Bb |
a
Different lowercase letters represent statistically significant differences within the same column (P < 0.05; vertical comparisons); different capital letters represent statistically significant differences within the same line (P < 0.05; horizontal comparisons).