Influence of different surface treatments on the bond strength between composites and resin cement
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Abstract
Purpose: Evaluate the influence of different surface treatments on bond strength (BS) between composite and a resin cement. Material and Methods: - 75 discs (10x2 mm)of Filtek P90, Filtek Z250 and Filtek Z350 XT (3M ESPE), were divided into 5 groups according to the treatment: C= control - no treatment; sandblasting J= aluminum oxide (50μm); sandblasting JE = + 99.3% ethanol for 5 min; silica coating S = (3M-ESPE Cojet - 30 microns); SS = silica coating + silane., Resin cement was inserted(3M ESPE-RelyX ARC) in PVC tubes (0.5 x 0.80 mm) attached on the composite discs surface. After 24 hours of artificial saliva storage at 37oC, the specimens were tested for microshear crosshead speed of 1.0 mm/min. Data were evaluated in two-way ANOVA and Tukey's test (5%) for contrast. Results: Sandblasting with aluminum oxide (S) increased the BS for composites Z350 and P90. Except for ethanol treatment, the remaining treatments did not improve the BS for Z250. Also, silica coating followed by silane application showed similar results as control for all composites.
Conclusion: BS values were dependent on the type of composite and the surface treatment used. Sandblasting with aluminum oxide seems to be an effective surface treatment for composites and may lead to higher BS values, while the use of ethanol might result in lower BS values.
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