Table 1 Mean and Standard Deviation of the ROMs’ volume (%) and Time required for attempt at removing the obturation materials (min) with or without PUI ultrasonics vibration (US)
| Â | Retreatments without PUI | Retreatments with PUI | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|
Reciprocating systems | Rotary systems | Reciprocating systems | Rotary systems | |||||||
WOG (16) | RB (16) | RM (16) | FAFO (16) | TE (16) | WOG-US (16) | RB-US (16) | RM-US (16) | FAFO-US (16) | TE-US (16) | |
ROM volume (%) | 2 ± 0.7a | 2.62 ± 1.1b | 6.8 ± 4.3a, b, c | 10.70 ± 4.1a, b, c, d | 9.51 ± 3a, b, c | 1.48 ± 1.2 | 1.31 ± 0.9 | 1.16 ± 0.9 | 1.88 ± 0.9 | 1.4 ± 1.1 |
Total | (48) 3.8 ± 3.32 | (32) 10.13 ± 3.57 | (48) 1.32 ±  | (32) 1.64 ± 1.05 | ||||||
(No: 80) P < 0.001 | (No: 80) P = 0.225 | |||||||||
6.27 ± 4.6 | 1.45 ± 1.0 | |||||||||
|  | P < 0.001 | |||||||||
Removal time (min) | 4.9 ± 0.7a | 5.4 ± 0.6b | 4.1 ± 0.6a, b, c | 4.1 ± 0.5a, b, d | 3.7 ± 0.5a, b, e |  | ||||
Total | 4.8 ± 0.8 | 3.9 ± 0.5 | ||||||||
P < 0.001 | ||||||||||