Table 4 Micro-tensile bond strength values (MPa) (means ± standard deviations) and statistical analysis of all experimental groups

ND

11.94 ± 0.99^a

15.82 ± 1.44^b

12.95 ± 1.38^a

12.23 ± 1.03^a

13.40 ± 0.90^a

12.13 ± 1.03^a

16.88 ± 1.85^b

16.42 ± 0.70^b

SD

11.14 ± 0.71^a

14.71 ± 0.57^b

11.04 ± 0.93^a

14.38 ± 0.91^b

13.65 ± 0.62^c

12.92 ± 0.63^d

19.01 ± 2.55^e

19.80 ± 1.42^e

P value

< 0.05

< 0.05

< 0.05

< 0.05

> 0.05

> 0.05

> 0.05

< 0.05