. 2016 Jun 13;2016:7576942. doi: 10.1155/2016/7576942

Table 2.

Median shear bond strength in MPa to zirconia surfaces before and after thermocycling (p < 0.05).

Thermocycling	Zirconia block	No primer		Z-Prime Plus
Thermocycling	Zirconia block	G-Cem	RelyX U200	G-Cem	RelyX U200
Before	Katana (Y-TZP)	30.24^A _a ^α	14.71^C _a ^α	25.21^AB _a ^α	22.56^B _a ^β
Before	NanoZR (Ce-TZP/Al₂O₃)	22.89^A _b ^α	14.24^B _a ^α	20.48^AB _b ^α	24.59^A _a ^α

After	Katana (Y-TZP)	19.09^B _a ^β	16.46^B _a ^α	23.60^AB _a ^α	29.69^A _a ^α
After	NanoZR (Ce-TZP/Al₂O₃)	14.12^B _a ^β	12.27^B _a ^α	16.15^B _b ^β	26.02^A _a ^α

Note: statistical differences are indicated by different superscript upper case letters (within a column for the same zirconia block and ageing process) or by different subscript lower case letters (within a row for the same surface treatment and aging process). Letters αβ in superscript reflect significant differences within a row for assessing effects of thermocycling within the same zirconia block.