Adhesion to eroded dentin submitted to different surface treatments

Ramos-Oliveira, Thayanne Monteiro; Ramos, Thaysa Monteiro; Garbui, Bruna Uglik; Hanashiro, Fernando Seishim; Freitas, Patricia Moreira de

Objective:

This in vitro study measured the microshear bond strength (μSBS) of a composite resin to sound and artificially eroded dentin, submitted to surface treatment with diamond bur (DB) or Er,CrYSGG laser (L). Material and

Methods:

Bovine radicular dentin samples were randomly divided into six groups (n = 11) G1- positive control (sound dentin), G2- negative control (eroded dentin), G3-eroded dentin treated with Er,CrYSGG laser at 1.5 W, G4-eroded dentin treated with Er,CrYSGG laser at 2.0 W, G5-eroded dentin treated with Er,CrYSGG laser at 2.5 W and G6-eroded dentin treated with diamond bur. Erosive cycling was performed by immersion in 0.05M citric acid (pH 2.3; 10 min; 6x/day) and in remineralizing solution (pH 7.0, 1 h, between acid attacks), for 5 days. Three composite resin cylinders were bonded to the samples with etchand-rinse adhesive system and after 24 h storage in distilled/deionized water (37 ºC), samples were submitted to microshear bond strength test and mean values (MPa) were analyzed by one-way ANOVA and Tukey tests (α = 0.05).

Results:

G1 (19.9 ± 7.6A) presented the highest μSBS mean followed by G6 (12.2 ± 3.8B), which showed no statistically significant difference compared with the other groups, except from G4. The lowest μSBS value was found for G4 (7.1±1.5C), which did not differ statistically from G2 (7.5 ± 1.8B,C), G3 (8.4 ± 1.8B,C) and G5 (8.6 ± 3.2B,C). Analysis of the fracture pattern revealed a higher incidence of adhesive fractures for all experimental groups.

Conclusion:

The results indicate none of the surface treatments (diamond bur and Er,CrYSGG laser irradiation at the parameters used in this in vitro study), associated with the etch-and-rinse adhesive system, did not enhance composite resin bonding to eroded dentin...

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