Efeito de diferentes soluções na limpeza sônica dos precipitados do ácido fluorídrico sobre a resistência de união entre uma cerâmica feldspática e um cimento resinoso

Abstract

The objective of this study was to evaluate the hypotheses: different ultrasonic cleaning media of the hydrofluoric acid precipitates influence the values of union resistance between ceramic feldspatic and resinous cement. Twenty blocks of Vita VM7 ceramic (VITA ® ) were obtained. The cementation surface of each block was duplicated in resin composite (W3D ® ). Ceramic blocks were randomly assigned in to 4 groups (n = 5/per group): G1 – etching with 9,6% AFL (Dentsply ® ) for 20s + rinsing with water spray for 60s + drying (Control); G2 – 9,6% AFL for 20s + rinsing with water spray for 60s + ultrasonic cleaning (Vitasonic ® ) in distilled water for 4 min + drying; G3 – 9,6% HF for 20s + rising with water spray for 60s + ultrasonic cleaning in acetone 99,5% 4 min + drying; G4 – 9,6% AFL for 20s + rinsing with water spray for 60s + ultrasonic cleaning in alcohol 70% for 4 min + drying . The ceramic blocks were silanized Porcelain Primer (Dentsply ® ) and cemented to the composite blocks using the resin cement RelyXTM ARC. The cemented blocks were sectioned in to axes (X and Y) with a diamond disk under coolant irrigation in order to obtain microbars with 1,0 mm² of bonding area. Each bar was attached to an adapted device and the microtensile test was performed using a universal testing machine (crosshead speed: 1 mm/min. The bond strengths and SD in Mpa were as follows: G1) 16,60 ± 0,52a; G2) 18,75 ± 0,37b; G3) 16,09 ± 0,92a e; G4)15,75 ± 1,38a. Utrasonic cleaning media after etching resulted in signifant difference among the groups (p < 0,05) (One-way ANOVA and Tuckey test). Only ultrasonic cleaning in distilled water demonstrated the highest bon strength with the tested resin-cement to feldspatic ceramic. Ultrasonic cleaning in acetone 99,5% and alcohol 70% did not affect the bond results.