Table 1.
The mean values (standard deviation) of all groups together with their statistical comparison obtained from different power levels of lasers applied to the external surface of the root canal.a,b
| Power |
KTP laser |
Nd:YAG laser |
||||
|---|---|---|---|---|---|---|
| Energy | Apical 1/3 | Middle 1/3 | Coronal 1/3 | Apical 1/3 | Middle 1/3 | Coronal 1/3 |
| 1 W | 2.11 (0.4) A,a | 1.63 (0.3) B,a | 1.51 (0.1) C,a | 4.47 (0.9) | 3.33 (0.7) d | 3.05 (0.8) d |
| 1.5 W | 2.54 (0.5) A,b | 2.26 (0.5) B,b | 2.14 (0.5) C,b | 6.96 (0.7) | 5.90 (1.2) e | 5.37 (0.8) e |
| 2 W | 4.87 (0.7) c | 4.57 (1.0) c | 4.16 (1.0) c | 11.60 (1.3) | 9.09 (1.3) f | 8.52 (0.8) f |
KTP laser = potassium titanyl phosphate laser; Nd:YAG = neodymium-doped:yttrium aluminum garnet.
a
By two-way analysis of variance: F = 359.690, P < 0.001, P < 0.05 (n = 30 specimens/experimental condition).
b
Values with same small (horizontal rows) and big (vertical columns) superscript letters show no statistical difference at P > 0.05 by Tukey test.