Effect of Polymerization Time and Home Bleaching Agent on the Microhardness and Surface Roughness of Bulk-Fill Composites: A Scanning Electron Microscopy Study

Table 4

Percentage alteration of microhardness values of composites (between before and after bleaching measurements) and values.

Polymerization time	FB; % alteration	SF; % alteration
10 s	-	-	0.690
20 s	-		0.548
30 s	-		0.151
p	0.827	0.454

Different capital letters show the significant differences between the same columns (). Different small letters show the significant differences between the same lines in each group ().