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.

<p>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).