Table 2.
Results of the surface and cross-sectional microhardness (MPa) at depths of 25-50 µm and 50-100 µm below the surface, and nano-indentation analysis represented by hardness (H) (GPa) and reduced elastic modulus (Er) (GPa)
| Control (no treatment) | NaF | NSSF | SDF | |||||
|---|---|---|---|---|---|---|---|---|
| Mean | SD | Mean | SD | Mean | SD | Mean | SD | |
| 25-50 µm depth | 12.363a,b,c | 1.842 | 23.177a,d | 1.282 | 20.160b,e | 5.816 | 34.790c,d,e | 3.058 |
| 50-100 µm depth | 24.843a,b,c | 1.792 | 30.693a,d | 2.350 | 27.463b,e | 4.371 | 39.789c,d,e | 1.116 |
| Surface | 28.118a,b,c | 3.451 | 40.479a | 5.488 | 38.004b | 10.233 | 42.895c | 3.110 |
| Surface - Er (GPa) | 6.47a | 1.369 | 4.356b | 0.734 | 5.120c | 1.094 | 10.237a,b,c | 1.682 |
| Surface - H (GPa) | 0.263 | 0.109 | 0.167a | 0.049 | 0.158b | 0.089 | 0.356a,b | 0.099 |
NaF: 5% sodium fluoride; NSSF: nanosilver sodium fluoride; SDF: silver diamine fluoride. Same superscript letters indicate statistically significant differences in the mean values at p < 0.05 (Dunnett’s T3 post-hoc multiple comparisons).