Table 2.

Mean (SD) of the retentive strength (MPa) of the zirconium oxide (Y-TZP) crown-copings for the 4 types of self-adhesive resin cements (SARC) groups pre-aging and post-aging.

Cement Type	Treatment	Sample No.	Mean Retentive Value (MPa)	Standard Deviation
U-200	1	15	2.73	0.63
	2	15	2.29	0.6
	Total	30	2.51	0.65
G-Cem	1	15	2.73	0.29
	2	15	2.82	0.52
	Total	30	2.78	0.42
TheraCem	1	15	2.58	0.7
	2	15	2.51	0.49
	Total	30	2.55	0.59
Panavia	1	15	2.6	0.31
	2	15	3.06	0.8
	Total	30	2.83	0.64
Total	1	60	2.66	0.51
	2	60	2.67	0.67
	Total	120	2.67	0.59

Treatment: 1—non-aged group; 2—aged group.