Masking Ability of Bleach Shade Composite Resins in Different Thicknesses

Table 3

The results of the Mann–Whitney U test: comparisons of MA of different thicknesses.

Thickness 1 (mm)	Thickness 2 (mm)	Mean rank of thickness 1	Mean rank of thickness 2	value
0.5	1	49.3	41.7	0.166
	1.5	52.1	38.9	0.016
	2	51.3	39.7	0.035
1	1.5	48.8	42.2	0.225
	2	48.7	42.3	0.250
1.5	2	44.9	46.1	0.824