Change in Surface Roughness of Esthetic Restorative Materials after Exposure to Different Immersion Regimes in a Cola Drink

Table 6

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 (𝑅𝑎, 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