Table 1. Masking ability of the zirconia specimens on the 5M3 shade substrate.

		Thickness (mm)
		0.7	1.0	1.2	1.5
Shade of zirconia	1M1	ta < yb < Wc < Oc < Bd	ta < ya < wb < oc < bd	oa < yb < tc < wd < be	wa,b < ob < tb,c < bc < yc
	1M2	oa < tb < bc < yd < we	ta < wb < yb < bc < Od	wa < tb < yb < ob < bc	ta < ob < bb < wb < yb
	2M1	oa < wb < bc < tc < yd	ta < ba < oa,b < wb < yc	wa = oa < yb < bc < td	oa < bb < wc < yc < td
	2M2	ya < tb < wb < bc < od	ta < ya < bb < wb < oc	ta < wa < bb < yc < od	ta < wa < yb < oc < bd
	2M3	wa < bb < yb < oc < tc	ya < wa < bb < tc < od	ta < wb < bc < yc < od	oa < tb < wb < yc < bc
	3M2	oa < ba < ta < yb < wc	ya < ba < wa < tb < Oc	wa < ba < yb < tb < oc	wa < ya < bb < tb < ob
	4M2	oa < ba < ta < Wb < Yc	ba < tb < wc < oc < Yd	ta < ob < yc < wc < bc	ta < yb < bb < ob < wb
	5M2	ta < yb < wc < Od < Be	ya < tb < bb < oc < wc	ta < wb < yb < oc < bd	ta < yb < wb < oc < bd

^*W(w), Y(y), T(t), B(b) and O(o), respectively, represent the ΔE values of different groups using try-in pastes in shades of white, yellow, transparent, bleach and opaque; Capital letters (W, Y, T, B, O) mean 2.6 ≤ ΔE < 5.5; Lowercases (w, y, t, b, o) mean ΔE < 2.6; Same superscripts represent no statistical difference between the groups.