Table 1. Properties of the materials used in this study.
| Product | Manufacturer | Shade | #Batch number |
Matrix | Filler particle size in μm | Filler weight in % (wt) | Type |
|---|---|---|---|---|---|---|---|
| Filtek Z550 | 3M ESPE,St.Paul, MN, USA | A2 | N502352 | Bis-GMA, UDMA, Bis-EMA, TEGMA, PEGDMA |
20 nm silica, 1-10 µm zirconia/silica particles | 82% | Nanohybrid |
| Filtek Z250 | 3M ESPE,St.Paul, MN, USA | A2 | N535897 | Bis-GMA, UDMA, Bis-EMA |
0.01-3.5 μm zirconia/silica particles |
82% | Microhybrid |
| Bis-GMA- Bisphenol A-glycidyl methacrylate; UDMA- Urethane dimethacrylate; Bis-EMA- Ethoxylatedbisphenol-A-dimethacrylate; TEGDMA- Triethylene glycol dimethacrylate; PEGDMA - polyethylene glycol dimethacrylate | |||||||