Table 3.

Mean bond values and standard deviation (MPa) with and without PTF and according to each experimental condition (*).

Adhesive	Groups	PTF inclusion	PTF exclusion
Adper single bond	1	14.0 ± 5.7d	14.8 ± 3.1D
	2	18.1 ± 3.6c, d	18.1 ± 3.6C, D
	3	37.7 ± 3.7a	37.7 ± 3.7A
XP bond	1	14.7 ± 4.2d	16.2 ± 4.2C, D
	2	19.7 ± 1.6c	20.5 ± 1.1C
	3	26.0 ± 4.4b	26.0 ± 4.4B

(*) Lowercase letters indicated significant difference between “pretest (PTF) failure inclusion” (P < 0.05); capital letters indicated significant difference between “PTF exclusion” (P < 0.05).