Table 7. Detection limit of the EPR signal for commercial composites, expressed as the time period needed for disappearance of the signal under the measurements conditions.
| Commercial composites | X-band detection threshold | L-band detection threshold |
| Filtek Supreme Ultra | 5 months | 16 days |
| Venus Diamond | 5 months | 1 day |
| IPS Empress Direct | 2 months* | 4 days |
| Tetric EvoCeram | 2 months* | 2 days |
| Amaris | 2 months | 0 day |
| GrandioSo | 2 months* | 1 day |
| Gradia Direct X | 3 months | 1 day |
| GC Kalore | 2 months | 1 day |
| Ice | 3 months | 8 days |
| N'Durance | 17 days | 3 days |
| Clearfil AP-X | >6 months | 18 days |
| Clearfil Majesty Esthetic | 3 months | 8 days |
| Synergy D6 | 2 months | 1 day |
| Esthet-X HD | 2 months | 3 days |
| TPH3 | 3 months | 4 days |
| Ceram-X | 2 months* | 10 days |
| Artiste Nano | 2 months | 4 days |
| Simile | 2 months | 3 days |
| Herculite Ultra | 18 days | 2 days |
The mass of the sample was 30 mg, a typical medium size restoration on an incisor.
*
detection threshold for the nine-lines signal. See table 8 for nitroxide-like signal threshold.