Avaliação da resistência à flexão biaxial de materiais reforçados submetidos a diferentes tratamentos de superfície

Abstract

The present work had the objective of evaluating the influence of surface treatment on the biaxial flexural strength of hybrid ceramics subjected to mechanical fatigue stress. Samples of 12 mm diameter disk by 1.2 mm thickness were obtained from lithium disilicate ceramic blocks (IPS e.max CAD, ivoclar-vivadent) and hybrid ceramics (Enamic, VITA, Lava ultimate , 3M ESPE). Each material received 4 surface treatments (n = 15): 10% hydrofluoric acid and silane (HF); Blasting with 50μm aluminum oxide and silane (O); Blasting with Rocatec® 30μm and silane (R); and application of Monobond Etch & Prime (M). In addition, three samples were included in each group for the purpose of complementary qualitative analyzes. The IPS.emax CAD (E), Vita enamic (V) and ultimate lava (L) were fed the resin X resin (3M ESPE) after each surface treatment and were subjected to the mechanical cycling test for 1.0x106 cycles and subsequently to the biaxial flexion test (ISO 6872) immersed in water. The samples designated the qualitative analyzes were submitted to optical profilometry, scanning electron microscopy (SEM) and dispersive energy dispersive X-ray (EDX). The data obtained in this study were submitted to the statistical analysis of variance (ANOVA) and to the multiple comparison test of turkey. The tests showed a statistically significant difference in biaxial flexural strength in the IPS.emax and Lava ultimate materials (P <0.05) and in the surface roughness of all materials except the VM group.