Table 3. Masking ability of the zirconia specimens on the precious-metal substrate.

		Thickness (mm)
		0.7	1.0	1.2	1.5
Shade of zirconia	1M1	ta < yb < Oc < Bd < Wd	ya < ob < tc < bd < we	oa < tb < Bb < Yb < Wc	oa < tb < bb < yc < wd
	1M2	oa < yb < tc < Bc < Wd	ya < Tb < Wc < Bd < Oe	ba < wb < yb < Tc < Od	ta < yb < wc < od < be
	2M1	wa < oa < Yb < Bc < Tc	Oa < Wb = Tb < Yc < Bc	ya < bb < oc < wd < td	wa < bb < ob < yc < td
	2M2	ba < Ob < Wb,c < Yc < Td	ya < tb < bb = ob < wc	ya < tb < bc < wd < od	ya < tb < bc < wd < oe
	2M3	oa < ba < wc < Yd < Td	ta < wa < yb < bc < Od	ta < bb < wc < oc < yd	ba < yb < tb < oc < wd
	3M2	Ba < Tb < Ob,c < Wc < Yd	Ta < Wb < Bb < Yc < Oc	ba < ya,b < tb < Wc < Oc	ba < ob < tb < yc < wd
	4M2	Oa < Bb < Wc < Yc < Td	ta < wb < yb < Bc < Od	ba < tb < yb < wb < Oc	ya < wa < tb < oc < bc
	5M2	ba < yb < tc < wc < od	ta < ya < wb < bc < Od	ta < wa < ya < ob < bc	ta < bb < yb < wc < od

^*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.