Abstract
Objective: The aim of the study was to evaluate the effect of a universal adhesive and different primers on the bond strength to zirconia ceramic. Materials and Methods: Seventy-five zirconia ceramic samples were obtained and divided into five groups (n=15): G1–Scothbond Universal (SBU); G2 – silane + SBU; G3 - Signum Zirconia Bond; G4 - Z-Prime Plus; G5 - MZ Primer. A cone of composite resin was built. The specimens were stored in 100% relative humidity with distilled water at 37°C for 48 h and then submitted to a tensile bond strength test in a universal testing machine at a crosshead speed of 0.5 mm/min. The type of failure that occurred during the de-bonding procedure was analyzed. Results: The mean results of the bond strength test (MPa) followed by the same letter represent no statistical difference by ANOVA and Tukey’s post-hoc test (p<0.05): G2=27.55a (±6.99), G4=23.71a (±5.65), G1=22.64a (±5.67), G5=13.64b (±5.49), G3=7.54c (±4.75). G2 and G4 exhibited predominantly cohesive failure in the composite resin cone. G1 and G5 had predominantly mixed failures, and G3 exhibited only adhesive failures. Conclusion: The SBU and Z-Prime Plus provided higher bond strength to zirconia ceramic.
Highlights
For indirect restorations, different luting techniques can be employed, and the literature has shown that the use of adhesive techniques provides an increase in the fracture resistance of teeth [1, 2]
The micromechanical bond is achieved by the penetration of the adhesive on the surface irregularities caused by acid etching
The hypothesis was rejected because the study showed differences in the bond strength to zirconia ceramic with the application of zirconia primers and the Scothbond Universal (SBU)
Summary
Different luting techniques can be employed, and the literature has shown that the use of adhesive techniques provides an increase in the fracture resistance of teeth [1, 2]. The process of bonding silica-based ceramics to resinous materials has been well established. One of the most effective treatment is hydrofluoric acid etching associated with silane application [3, 4]. 930 The Open Dentistry Journal, 2018, Volume 12 increase the wettability of the resinous material on the surface of the ceramic [5, 6]. The micromechanical bond is achieved by the penetration of the adhesive on the surface irregularities caused by acid etching. The chemical bond is achieved by silane, which promotes the bond between Si-containing surfaces and organic polymeric materials [7, 8]
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