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The micro-hardness value of native, acid-etched and remineralised enamel.
| Sample | Mean Knoop hardness value (KHN) ± standard deviation (S.D.) |
|---|---|
| Natural Enamel | 343.73 ± 21.45 |
| Acid-etched enamel | 66.55 ± 19.25 |
| Remineralised enamel in group A for 5 h remineralisation | 322.55 ± 31.90 |
| Remineralised enamel in group B for 5 h remineralisation | 305.68 ± 40.05 |
