Table 3.
Mean surface roughness (nanometer) of the four composite resins after different aging conditions
| Composite | Prior to silica coating | After silica coating | ||||||
|---|---|---|---|---|---|---|---|---|
| Non-aged control | Thermocycling | Water storage | Citric acid immersion | Non-aged control | Thermocycling | Water storage | Citric acid immersion | |
| AS | 9 ± 1 | 37 ± 6 | 54 ± 21 | 39 ± 18 | 409 ± 26 | 510 ± 69 | 360 ± 14 | 335 ± 12 |
| G | 7 ± 1 | 43 ± 17 | 53 ± 7 | 20 ± 12 | 351 ± 24 | 511 ± 29 | 392 ± 13 | 342 ± 41 |
| TE | 8 ± 3 | 79 ± 13 | 30 ± 5 | 25 ± 2 | 346 ± 15 | 494 ± 124 | 378 ± 13 | 364 ± 8 |
| FS | 4 ± 1 | 65 ± 24 | 41 ± 7 | 22 ± 5 | 411 ± 18 | 463 ± 74 | 418 ± 20 | 329 ± 111 |
Surface roughness was measured prior to and after silica coating. ± denotes standard deviations over three specimens. For abbreviations, see Table 1