Table 2.
Effects of Extended Moisture Absorption on Mechanical Performance for Thiol-Michael and BisGMA/TEGDMA Composite Systems.
| Condition: Resin System | Young’s Modulus, GPa | Flexural Strength, MPa | Toughness, J·m-3 |
|---|---|---|---|
| Before water conditioning | |||
| BisGMA/TEGDMA | 7.4 (0.3) | 57 (11) | 0.91 (0.28) |
| PETMP/DVS | 2.3 (0.3) | 24 (2) | 4.0 (0.7) |
| SiTSH/DVS | 4.5 (0.7) | 41 (6) | 1.4 (0.4) |
| After 22 mo of water sorption | |||
| BisGMA/TEGDMA | 4.2 (0.3) | 21 (5) | 0.19 (0.1) |
| PETMP/DVS | 0.28 (0.05) | 9.1 (1.2) | 0.98 (0.39) |
| SiTSH/DVS | 4.3 (0.2) | 45 (3) | 1.0 (0.4) |
With 50 wt% functionalized silica filler composites cured with 2 wt% NPPOC-TMG and 100 mW/cm2 of 320-390 nm at ambient temperature. Values are presented as mean (SD).
BisGMA/TEGDMA, 2,2-bis[p-(3-methacryloxy-2-hydroxypropoxy) phenyl]propane / triethylene glycol dimethacrylate; DVS, divinyl sulfone; NPPOC-TMG, 2-(2-nitrophenyl)-propyloxycarbonyl-1,1,3,3-tetramethylguanidine; PETMP, pentaerythritol tetra(3-mercaptopropionate); SiTSH, silane thiol; SR368, tris(2-hydroxyethyl)isocyanurate triacrylate.