Influência do tratamento de superfície na qualidade adesiva da interface de cerâmica Y-TZP com cimento resinoso

Abstract

Consider the efficacy of Selective Infiltration Etching (SIE) treatment as a procedure to modify the zirconia surface resulting in higher interfacial fracture toughness. After sintering, the CAD/CAM Y-TZP was subjected to 5 different surface treatments consisting of no treatment group (G1), SIE followed by hydrofluoric acid treatment (G2), heat treated at 750 °C (G3), hydrofluoric acid treated (G4) and airborneparticle abrasion with alumina particles (G5). Atomic Force Microscopy evaluated the effect of surface treatment on roughness by three different parameters: Ra, Rsk and surface area variation. The ceramic/resin cement interface was analyzed by Fracture Mechanics KI test with failure mode determined by fractography analysis. Weibull’s analysis was also performed to evaluate the structural integrity of the adhesion zone. G2 and G4 specimens showed very similar, and high Ra values but different surface area variation (33% for G2 and 13% for G4) and they presented the highest fracture e toughness (KIC). Weibull’s analysis showed G2 (SIE) tendency to exhibit higher KIC values than the other groups but with more data scatter and a higher early failure probability than G4 specimens. Selective glass infiltration etching surface treatment was effective in modifying the zirconia surface roughness, increasing the bonding area and hence mechanical imbrications at the zirconia/resin cement interface resulting in higher fracture toughness (KIC) values with higher KIC values obtained when failure probability above 20% is expected.