Table 1.
Percentage change in the median concentration of particles in various size ranges during the procedures, with respect to the baseline levels (measured in the ten-minute period prior to the start of the procedure). For the final two procedures (repair and the use of 3-in-1 air-water syringe used to remove etch), the values show the percentage change in the single data point recorded during the procedure, relative to the baseline
| Procedure | Number | Duration (mins) | Very small (0.08-0.26 μm) | Small (0.26-0.9 μm) | Medium (0.9-2.6 μm) | Large (2.6-10 μm) |
|---|---|---|---|---|---|---|
| Standard debond | 1 | 11:00 | 104.7 | 111.7 | 97.3 | 136.7 |
| 2 | 11:00 | 104.4 | 119.5 | 82.0 | 78.7 | |
| 3 | 4:00 | 144.2 | 246.0 | 155.1 | 86.3 | |
| Average | - | 117.8 | 159.1 | 111.5 | 100.6 | |
| Debond without air | 1 | 4:10 | 152.9 | 344.1 | 149.4 | 86.1 |
| 2 | 5:00 | 171.8 | 140.4 | 225.5 | 367.8 | |
| 3 | 4:00 | 328.3 | 410.2 | 3040.3 | 5195.5 | |
| Average | - | 217.7 | 298.2 | 1138.4 | 1883.1 | |
| Debond with water | 1 | 9:00 | 96.0 | 133.2 | 161.1 | 89.4 |
| 2 | 3:50 | 100.8 | 246.7 | 1523.9 | 6831.7 | |
| Average | - | 98.4 | 190.0 | 842.5 | 3460.5 | |
| Debond with fast handpiece | 1 | 11:00 | 135.2 | 84.8 | 150.0 | 430.1 |
| 2 | 11:00 | 96.9 | 146.7 | 294.4 | 179.8 | |
| 3 | 11:00 | 89.1 | 140.9 | 401.5 | 168.2 | |
| Average | - | 107.1 | 124.1 | 282.0 | 259.4 | |
| Repair (standard debond) | 1 | 0:30 | 415.9 | 328.8 | 668.5 | 103.4 |
| 3-in-1 air-water syringe | 1 | 0:30 | 81.2 | 94.3 | 157.5 | 110.7 |