| Autor: |
Silva Sousa, Ana Beatriz, Jardilino Silami, Francisca Daniele, Roberti Garcia, Lucas da Fonseca, Naves, Lucas Zago, Panzeri Pires-de-Souza, Fernanda de Carvalho |
| Předmět: |
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| Zdroj: |
Journal of Adhesive Dentistry; 2013, Vol. 15 Issue 2, p137-144, 8p, 8 Black and White Photographs, 3 Charts, 1 Graph |
| Abstrakt: |
Purpose: To evaluate the effect of two adhesive systems and different aging protocols on the bond strength of a repaired microhybrid composite. Materials and Methods: Eighty test specimens (n = 20) and 10 control specimens measuring 8 x 4 mm were fabricated of a microhybrid composite (4 Seasons, shade A2) and grouped according to time/aging protocol: G1: 24 h in artificial saliva; G2: 7 days in artificial saliva; G3: 30 days in artificial saliva; G4: artificial accelerated aging (AAA) for 384 h; G5: control. After aging, samples were submitted to three types of surface treatment: SB2: Adper Single Bond 2, a two-step adhesive (3M ESPE); SB3: Adper Scotchbond Multi-Purpose, a three-step adhesive (3M ESPE); C: without application of adhesive (control). After this, test specimens were repaired with the same composite of a different shade (C3), and submitted to the microtensile test at a crosshead speed of 0.5 mm/min. Failure modes were analyzed by scanning electron microscopy (Jeol JSM 7500). Statistical analy- sis was performed using ANOVA and Tukey's test (p < 0.05). Results: G2/SB2 presented significantly lower bond strength values in comparison with the other groups (p < 0.05). The control group presented the highest bond strength values, which differed statistically significantly from SB3, G3/SB2, and G4/SB2 (p < 0.05). Fractographic analysis demonstrated that most samples presented predominantly cohesive failures, excepting GI/SB2, which presented mixed and cohesive failures, and G4/SB2 and G1/SB3, which showed adhesive failures. Conclusion: The repair was more effective when performed after a short period of time and when the 3-step ad- hesive system (SB3) was used. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
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