Influence of Different Adhesive Systems on the Bond Strength of Fiber Post to Root Dentin

Fernanda CAMPOS, Hugo Ramalho SARMENTO, Maria Luiza Lima ALVES, Rafael Santiago de SOUSA, RODRIGO Othávio de Assunção e SOUZA, André Rômulo Rozado de SOUSA

Abstract


Purpose: To evaluate the influence of different adhesive systems on the bond strength of fiber post luted to root dentine. The hypothesis was that the bond strength is influenced by the adhesive system.
Method: The canals of thirty single-root bovine roots (16mm in length) were prepared using the preparation drill (FGM) until 12mm. 14 mm of each root was embedded with acrylic resin and the specimens were allocated into three groups (n=10), considering the factor “adhesive” (3 levels): Gr1- Scotchbond Multipurpose Plus (3M ESPE), Gr2- One Step (Bisco) and Gr3- Excite DSC (Ivoclar Vivadent). The adhesive systems were applied using a microbrush, according to the manufacture’s recommendations. The fiber posts (White Post DC, FGM) were luted with dual resin cement (All-Cem). After, the cores with composite resin (Llis, FGM) were made and each set of root/post/core was submitted to the mechanical cycling (Erios, Brazil) (106 cycles, 84N, 4 Hz, inclination of 45º, 37ºC, water). Each specimen was cut in 4 samples (1.8mm in thickness), which were submitted to the push-out test in a universal testing machine (ServoPulser – Shimadzu) (50Kgf, 1mm/min). The data (MPa) were analyzed using ANOVA (1-way) and Tukey test (5%).
Results: The factor “adhesive” (P=0.00352) influenced the bond strength significantly (ANOVA 1-way). Gr1 (6.8±3.8 MPa)a presented higher bond strength values than Gr2 (3.1±1.5 MPa)b and similar to Gr3 (4.4±3.3)a,b. Moreover, Gr3 and Gr2 were similar between them (Tukey test). The hypothesis was accepted.
Conclusion: Based on the results, it’s licit to conclude that the light cured adhesive system should not be used for the adhesive luting fiber post procedures.

Keywords


Pinos de fibra. Teste Push-out. Sistema adesivo.



DOI: http://dx.doi.org/10.4034/pboci.v11i3.827

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