Abstract
Objective: This study evaluated microleakage of composite restorations submitted to marginal treatment with Nd:YAG laser and surface sealant. Background Data: Previous studies have demonstrated that Nd:YAG-lased enamel melted and became recrystallized with a morphologic appearance similar to lava, and has been used clinically in the sealing of enamel pits and fissures. Methods: Class V cavities in enamel of human premolars were restored with composite resin (Z100, 3M) and randomly divided in six groups: G1, control; G2, surface sealant marginal treatment; G3 to G6, were treated with pulsed Nd:YAG laser (1.064 μm) marginal treatment, contact fiberoptic (300 pm), air cooling, for 30 seconds, powers of 1.2–2 W, repetition rates of 20–30 Hz, energies of 40–100 mJ. Teeth were impermeabilized, immersed in a rhodamine dye, sectioned, and evaluated under stereomicroscope microscopy with scores. Results: There were significant differences between marginal treatments; there were no differences between groups 1, 2, and 4, and 3, 5, and 6; lower values of microleakage were at groups 3, 5, and 6 (Kruskal-Wallis, p = 0.05). Conclusion: Nd:YAG laser showed improved marginal sealing and decreased microleakage of composite resins restorations.
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