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Showing mean difference in surface roughness (R a, μm) and microhardness (HV) among various sub groups of group IV—composite resin (Filtek Z 350).
| Subgroup | Subgroup | Surface roughness (R a, μm) | ||
|---|---|---|---|---|
| Mean difference | (P value) | Significance | ||
| Subgroup IVA (Control) | Subgroup IVB | −0.014 | >0.05 | NS |
| Subgroup IVC | −0.018 | >0.05 | NS | |
| Subgroup IVD | −0.022 | >0.05 | NS | |
| Subgroup IVE | −0.029 | >0.05 | NS | |
