Table 1.

Mean and standard deviations in MPa for the shear bond strength (SBS) among the study groups.

Surface preparation methods	Ceramic type						P-value within surface preparations
	VITA Suprinity® PC (n = 30)			IPS e. max (n = 30)
	Group (N)	N (%) of Samples de-bonded after aging	Mean SBS in MPa (SD)	Group (N)	N (%) of Samples de-bonded after aging	Mean SBS in MPa (SD)
HFA	GI (10)	1 (10%)	8 b c (4.5)	GIV (10)	3 (30%)	5.4 c (1.4)	0.000∗∗∗
Soflex discs	GII (10)	5 (50%)	5.6 c (2)	GV (10)	2 (20%)	12 a b (4)
Soflex discs & HFA	GIII (10)	0 (0%)	16 a (5)	GVI (10)	0 (0%)	14 a b (3.3)
P-value between ceramic types	0.04∗

N: number, SD: standard deviation, SBS: shear bond strength, MPa: mega-pascal.

∗,∗∗∗: denotes statistical significance (critical region: P < 0.05, P < 0.001).

^a,b,c: denotes Post-hoc Tukey's statistical differences between the groups (critical region: P < 0.05).