Commercial presentation effect on adhesive properties of a universal adhesive

Objectives:
The effect of the commercial presentation of a universal adhesive system (Tetric N-Bond Universal [TNU]) on bond strength (SBU) and nanoleakage (NL) on dentin was evaluated.


Methods: The occlusal enamel of 30 molars was removed and the adhesives were applied to the surface of the dentin according to the following: commercial presentation - bottle [B] or pen [P]; and mode of application - with phosphoric acid (TE) or without phosphoric acid (self-etch SE). These teeth were then restored with composite resin and sectioned to obtain specimens (sticks), which were tested for bond strength (SBU) and nanoleakage (NL). The data were analyzed by one-way ANOVA and Tukey's test (α = 0.05).
Results: For SBU, the following results were obtained (MPa): P-SE = 56.5 ± 4.5; B-SE = 47.01 ± 3.7; P-TE = 60.8 ± 3.4; And B-TE = 55 ± 5.2. For NL (%) the following results were obtained: P-SE = 4.40 ± 2.25; B-SE = 7.8. 3.21; P-TE = 6.53 ± 1.85; and B-TE = 9.12 ± 2.66. It was observed a higher SBU for the pen adhesive, in both strategies (p <0.05). For NL, there was no statistical difference between groups (p> 0.05).
Conclusions: In the adhesive properties of the adhesives tested, the pen presentation showed better performance when compared to bottle at the bond strength.