Table 1.
Mean hardness values in Shore A units and standard deviations.*
| Silver nanoparticle concentration, ppm | Hardness, Shore A units | ||
|---|---|---|---|
|
| |||
| 24 h | 7 days | 28 days | |
| 0 | 31.2 (0.6) A,a | 31.3 (0.5) A,a | 31.1 (0.5) A,a |
| 10 | 28.9 (0.5) B,b | 28.8 (0.7) B,b | 28.9 (0.8) B,b |
| 20 | 28.2 (0.6) C,bd | 28.2 (0.6) C,bd | 28.1 (0.7) C,d |
| 40 | 27.5 (0.7) D,d | 27.5 (0.7) D,d | 27.6 (0.7) D,d |
| 80 | 25.9 (0.4) E,e | 26.3 (0.5) E,e | 26.2 (0.8) E,e |
| 120 | 22.8 (0.4) F,f | 22.9 (0.5) F,f | 22.8 (0.5) F,f |
| 200 | 21.4 (1.0) G,g | 21.3 (1.1) G,g | 21.3 (0.8) G,g |
Notes:
*
Groups with the same uppercase superscript letters; (A–G) for each row and lowercase superscript letters; (a–g) for each column are not significantly different at the p < 0.05 level.