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Experimental groups (n=10) in accordance with the light source and time of curing tested.
| Group | Light Source | Irradiance (mW/cm2) | Irradiance (mW/cm2) at 2 mm | Time of Curing |
|---|---|---|---|---|
| G1 | QTH (Optilux 501, Sybron Kerr, Danbury, CT, USA) | 600 | 600 | 20 s |
| G2 | QTH (Optilux 501, Sybron Kerr, Danbury, CT, USA) | 600 | 600 | 40 s |
| G3 | LED (Ultralume 5, Ultradent Products Inc., South Jordan, Utah) | 800 | 820 | 20 s |
| G4 | LED (Ultralume 5, Ultradent Products Inc., South Jordan, Utah) | 800 | 820 | 40 s |
