Effect of Laser and Conventional Office Bleaching and Polishing on the Color Change of Stained Nanohybrid and Microhybrid Composite Resin

Table 7

ANOVA test of mean color change after stain-removal procedures compared with baseline (ΔE₃).

Source	Type III sum of squares	df	Mean Square	F	Sig.
Corrected model	50.442^a	5	10.088	2.639	0.037
Intercept	903.258	1	903.258	236.266	0.000
Composite	9.769	1	9.769	2.555	0.046
Method	20.480	2	10.240	2.678	0.081
Composite method	22.555	2	11.277	2.950	0.094
Error	156.745	41	3.823
Total	1,095.540	47
Corrected total	207.188	46

^aR² = 0.243 (adjusted R² = 0.151). Interacion between composite and method and its effect on ΔE. ANOVA, analysis of variance.