Effect of surface treatment on the shear bond strength of a resin-based cement to porcelain
Nagayassu, Marcos Paulo; Shintome, Luciana Keiko; Uemura, Eduardo Shigueyuki; Araújo, José Eduardo Junho de.
Braz. dent. j
; 17(4): 290-295, 2006. tab, ilus
Artículo
en Inglés
| LILACS | ID: lil-442396
The purpose of this in vitro study was to evaluate the effect of different surface treatments on the shear bond strength of a resin-based cement to porcelain. Sixty pairs of 50 percent aluminous porcelain discs were fabricated. In each pair, one disc measured 6 mm in diameter X 3 mm thickness (A) and the other measured 3 mm in diameter X 3mm thickness (B). The specimens were randomly assigned to 6 groups (n=10 pairs of discs), according to the surface treatment etching with 10 percent hydrofluoric acid for 2 or 4min (G1 and G2); 50-æm particle aluminum oxide sandblasting for 5 s (G3); sandblasting followed by etching for 2 or 4min (G4 and G5) and control - no treatment (G6). A silane agent was applied to the treated surface of both discs of each pair. Bistite II DC dual-cure resin cement was applied and the B discs were bonded to their respective A discs. Specimens were stored in distilled water at 37°C for 24 h and were tested in shear strength at a crosshead speed of 2 mm/min. Means in MPa were G1 14.21 ± 4.68; G2 8.92 ± 3.02; G3 10.04 ± 2.37; G4 12.74 ± 5.15; G5 10.99 ± 3.35; G6 6.09 ± 1.84. Data were compared by one-way ANOVA and Tukey's test at 5 percent significance level. Bond strength recorded after 2-min acid etching was significantly higher than 4-min etching (p<0.05) and control (p<0.05), but did not differ significantlyfrom sandblasting alone (p>0.05) or followed by etching for 2 or 4 min (p>0.05). Within the limitations of an in vitro study, it may be concluded that 2-min hydrofluoric acid etching produced a favorable micromechanical retention that enhanced resin cement bond strength to porcelain.
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