[Table/Fig-6]:

Comparison of mean change in ΔE values of Group A, Group B and Group C specimens.

Group	Sub-Group	Mean	Std. Deviation	N
Group A	A1	.9551	.21334	10
	A2	11.9481	2.47108	10
	Total	6.4516	5.89201	20
Group B	B1	1.0198	.19275	10
	B2	13.6106	2.97498	10
	Total	7.3152	6.77699	20
Group C	C1	1.0374	.24138	10
	C2	13.8882	.96288	10
	Total	7.4628	6.62763	20
Total	Sub-group 1	1.0041	.21221	30
	Sub-group 2	13.1490	2.38509	30
	Total	7.0765	6.34962	60