. 2018 Feb 28;2018:9189354. doi: 10.1155/2018/9189354

Table 2.

Microtensile bond strengths (mean ± SD, MPa) for all specimen groups.

Resin cement	Polishing method	Water storage time
Resin cement	Polishing method	24 hours	2 years
Etch-and-rinse	A	24.4 ± 7.6^aA	25.6 ± 7.8^aA
Etch-and-rinse	B	24.4 ± 9.0^aA	23.5 ± 7.3^aA
Self-etch	A	60.8 ± 14.4^bA	15.7 ± 8.5^bB
Self-etch	B	71.3 ± 11.8^cA	28.0 ± 12.6^aB
Self-adhesive	A	21.9 ± 5.8^aA	7.3 ± 5.0^cB
Self-adhesive	B	36.5 ± 6.3^dA	8.8 ± 2.6^cB

Means with same letters are not significantly different by Turkey's test (p > 0.05). Means with the same lowercase letters within same column are not statistically different, and means with the same uppercase letters within same row are not statistically different.