Table 8. Detection limit of the EPR signal for experimental resins and mixtures, expressed as the time period needed for disappearance of the signal under the measurements conditions.
| Experimental resins | X-band detection threshold | L-band detection threshold |
| G 100% | >6 months | >5 months |
| T 100% | 2 months | 0 day |
| U 100% | >6 months | >5 months |
| E-15 100% | 1 day | 0 day |
| E-2 100% | 1 month | 16 days |
| G/T 0.3582/0.6418 | >6 months | 3 months |
| G/T 0.5659/0.4341 | >6 months | 3 months |
| G/U 0.3582/0.6418 | >6 months | 3 months |
| G/U 0.5659/0.4341 | >6 months | 3 months |
| G/E-15 0.3582/0.6418 | 2 days | 1 hour |
| G/E-15 0.5659/0.4341 | 1 month | 3 days |
| G/T/U/E-15 0.5660/0.2340/0.1/0.1 | >6 months | 3 months |
| G/T/U/E-15 0.5660/0.1340/0.15/0.15 | >6 months | 3 months |
| G/U/E-15 0.5660/0.2170/0.2170 | 5 months | 3 months |
The mass of the sample was 30 mg, a typical medium size restoration on an incisor. G: Bis-GMA, T: TEGDMA, U: UDMA, E-15: Bis-EMA (15-ethoxy/phenol), E-2: Bis-EMA (2-ethoxy/phenol).