Abstract
Laser irradiation after the immediate application of dentin bonding systems (DBSs) and prior to their polymerization has been proposed to increase bond strength. The objective of this study was to evaluate the effect of diode laser irradiation (λ = 970 nm) on simplified DBSs through microtensile bond strength tests. Forty healthy human molars were randomly distributed among four groups (n = 10) according to DBSs used [Adper™ SingleBond 2 (SB) and Adper™ EasyOne (EO)], and the respective groups were irradiated with a diode laser (SB-L and EO-L). After bonding procedures and composite resin build-ups, teeth were stored in deionized water for 7 days and then sectioned to obtain stick-shaped specimens (1.0 mm2). The microtensile test was performed at 0.5 mm/min, yielding bond strength values in MPa, which were evaluated by two-way ANOVA followed by Tukey's test (p < 0.05) for individual comparisons. For both adhesive systems, diode laser irradiation promoted significant increases in bond strength values (SB: 33.49 ± 6.77; SB-L: 43.69 ± 8.15; EO: 19.67 ± 5.86; EO-L: 29.87 ± 6.98). These results suggest that diode laser irradiation is a promising technique for achieving better performance of adhesive systems on dentin.
Highlights
Because the influence of diode laser irradiation associated with simplified dentin bonding systems (DBSs) has not been well established, the aim of this study was to evaluate, through the microtensile bond strength test, the effect of diode laser irradiation on two simplified DBSs applied to human dentin
Similar results have already been reported with the Nd:YAG laser irradiation of simplified DBSs,[14,15] suggesting that near-infrared laser irradiation is a promising technique for achieving a more reliable link to dentin; the underlying mechanism is still unknown
It was recently found that a warm air stream can provide immediate increases in bond strength values of simplified DBSs,[17] which could explain the favorable results obtained with the laser irradiation technique
Summary
For better adhesion to dentin, some authors have suggested the use of lasers for dentin conditioning, as laser irradiation can provide an apparently microretentive surface, free of a smear layer and open dentinal tubules.[9,10] despite this notable morphology, laser-treated dentin has been reported to provide bond strength values only equal to or lower than those of dentin treated in the traditional manner.[11,12]. A different approach was suggested to promote better adhesion to dentin via lasers. Gonçalves et al.[13] proposed the laser irradiation of already infiltrated dentin adhesive systems, prior to their polymerization. This technique promoted increased bond strength values of simpli-
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