Efeito de diferentes métodos de condicionamento e do agente cimentante na durabilidade de união a novos materiais CAD/CAM

Abstract

The object of the present study was to evaluate the effect of two different types of surface treatments on the adhesive resistance to microcillion after cementing four types of glass ceramics reinforced with two types of resin cement, one self-etching / self-adhesive and the other conventional, after being subjected to thermocycling. The ceramics used were: Vita Enamic, Vita Suprinity and Vita Mark II. 35 blocks were made of each ceramic, 2mm thick, polished on one side. On this polished face of 15 samples from each group, he applied the surface treatment with hydrofluoric acid (HF) and silane, in another 15 the treatment was with Monobond Etch and Prime, and the final 5 received no surface treatment. From each ceramic group, 15 samples treated (5 without treatment, 5 with HF and 5 with monobond) were sent to qualitative tests of scanning electron microscopy and profilometry. The remaining 20 samples were divided into two subgroups containing 10 specimens with HF treatment and 10 with monobond and received cementation cylinders from two different cements, so that half of the HF treatment samples were cemented with Multlink Speed and the other half with Multlink N After thermocycling, these 20 samples were submitted to shear tests in the universal testing machine (EMIC), and the results were analyzed by the Two-way ANOVA, D'Agostino & Pearson and Tukey tests. The results revealed higher mean bond strength values for the Enamic group when the surface treatment was carried out with HF and silane, and the influence of cement only occurred for groups treated with Monobond, with the self-adhesive cement being higher than the conventional one. For the Vita Mark II group, the values were higher for the groups treated with HF and the Monobond group with self-etching cement, with no statistical differences between them, but for the monobond group with conventional cement. For Suprinity ceramics, there was no influence on the type of surface treatment, but on the type of cement, with the highest average bond values found for groups that received self-adhesive cement. With the results obtained it was concluded that both the surface treatment and the type of cement used can influence the bond strength, depending on the type of the ceramic, and for the Enamic and Vita Mark ceramics the surface treatment with HF and silane promotes a union with higher average values and for Suprinity, the most expressive average values occur with cementation of self-etching resin cement.