Influência de diferentes tratamentos de superfície na durabilidade da união entre um cimento resinoso e uma cerâmica policristalina de zircônia tetragonal parcialmente estabilizada com ítria.

Abstract

Purpose: This study evaluated the influence of air-particle-abrasion and different solutions application on the shear bond strength of resin cement to zirconia ceramic (Y-TZP). Materials and method: Sintered zirconia blocks (N=180) (Lava, 3M ESPE), with final dimensions of 5.25 x 3.74 x 4.5 mm, were embedded in acrylic resin, polished and randomly distributed among 18 groups (n=10), according to the factors: "solution (8 levels) and air-particle-abrasion" (2 levels): Ctr (control without treatment), AP- Alloy Primer/Kuraray, MP- Monobond Plus/Ivoclar, MZP- Metal Zircônia Primer/Ivoclar, MZ- MZ Primer/Angelus, ReX- Relyx Ceramic Primer/3M ESPE, Sg- Signum Zirconia Bond/Kulzer, SbU- Scotchbond Universal/3M ESPE and ZP- Z Prime Plus/Bisco. The same solutions were also used after zirconia sandblasting: Ctr.S, AP.S, MP.S, MZ.S, ReX.S, Sg.S, SbU.S and ZP.S (*.S = sandblasting). Prior sandblasting, the zirconia/acrylic resin assemblents were ultrasonic cleaned for 5min (Vitasonic, Germany). The .S groups were air abraised with Al2O3 particles (110μm, 2.5 bar, 20s at 10mm), with an assistance of a chairside air-abrasion device (Bioart, Brazil) and another ultrasonic cleaned was performed. After dry the solutions were applied according to the manufactors´ recommendations. The resin cement (Rely X ARC, 3M ESPE) cylinders were bonded and polymerized to zirconia surface, with the aid of a silicone mold (Ø = 3.5, height = 3 mm). All samples were stored in distilled water (60 days at 370 C), and after were subjected to shear test (1 mm/min). Data were analyzed by ANOVA (e-way) and Tukey test (α=5%). Results: Air-particle abrasion (p=0.0001) and solution (p=0.0001) factors significantly affected the bond strength (ANOVA) All samples of the groups Ctr, Ctr.S, ReX, MZ.S and MZP, MZP.S showed premature failure (debonding). Thus, they were not included in the statistical analysis. In addition, air-abrasion increased the bond strength (With: 110.78A MPa; Without: 70.92B MPa) and the solution SbU (142.91a MPa) promoted higher adhesion between ceramic/resin cement than MP (100.15bc MPa), AP (90.03c MPa), ReX (34.03d MPa) and MZ (23.66d MPa), and was similar to Sg (131.78ab MPa) and ZP (113.37bc MPa) (Tukey). Conclusion: Air-abrasion with 110 μm Al2O3 followed by solutions application increased the bond strength to zirconia, except for SbU, that presented the highest value of bond strength.