Table 3. Incidence of bond failure modes.

Mode of bond failure	Incidence (%) of bond failures
	Feldspar-based ceramic (FP)				Zirconia-based ceramic (ZR)
	Etch-and Bond cement (EB)		Self-adhesive cement (SA)		Etch-and-Bond cement (EB)		Self-adhesive cement (SA)
	Non-aged	Aged	Non-aged	Aged	Non-aged	Aged	Non-aged	Aged
Adhesive (D)	40	10	20	40	10	40	40	30
Adhesive (C)	40	70	20	20	30	40	40	40
Mixed	20	20	60	40	60	20	20	30
Cohesive (D)	0	0	0	0	0	0	0	0
Cohesive (C)	0	0	0	0	0	0	0	0

D = Dentin interface, C = Ceramic interface, FP = feldspar-based ceramic, ZR = Zirconia-based ceramic, EB = Etch-and-Bond cement, SA = Self-adhesive cement