Artículos de revistas
Durability of feldspathic veneering ceramic on glass-infiltrated alumina ceramics after long-term thermocycling.
Minerva stomatologica, v. 59, n. 7-8, p. 393-399, 2010.
Universidade Estadual Paulista (UNESP)
This study compared the bond strength durability of a feldspathic veneering ceramic to glass-infiltrated reinforced ceramics in dry and aged conditions. Disc shaped (thickness: 4 mm, diameter: 4 mm) of glass-infiltrated alumina (In-Ceram Alumina) and glass-infiltrated alumina reinforced by zirconia (In-Ceram Zirconia) core ceramic specimens (N=48, N=12 per groups) were constructed according to the manufacturers' recommendations. Veneering ceramic (VITA VM7) was fired onto the core ceramics using a mold. The core-veneering ceramic assemblies were randomly divided into two conditions and tested either immediately after specimen preparation (Dry) or following 30000 thermocycling (5-55 oC±1; dwell time: 30 seconds). Shear bond strength test was performed in a universal testing machine (cross-head speed: 1 mm/min). Failure modes were analyzed using optical microscope (x20). The bond strength data (MPa) were analyzed using ANOVA (α=0.05). Thermocycling did not decrease the bond strength results for both In-Ceram Alumina (30.6±8.2 MPa; P=0.2053) and In-Ceram zirconia (32.6±9 MPa; P=0.3987) core ceramic-feldspathic veneering ceramic combinations when compared to non-aged conditions (28.1±6.4 MPa, 29.7±7.3 MPa, respectively). There were also no significant differences between adhesion of the veneering ceramic to either In-Ceram Alumina or In-Ceram Zirconia ceramics (P=0.3289). Failure types were predominantly a mixture of adhesive failure between the veneering and the core ceramic together with cohesive fracture of the veneering ceramic. Long-term thermocycling aging conditions did not impair the adhesion of the veneering ceramic to the glass-infiltrated alumina core ceramics tested.
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Bond strength of a resin cement to high-alumina and zirconia-reinforced ceramics: The effect of surface conditioning Valandro, Luiz Felipe; Özcan, Mutlu; Bottino, Marco Cícero; Bottino, Marco Antonio; Scotti, Roberto; Della Bona, Alvaro
Silva, O. M M; Souza, J. V C; Nono, M. C A; Martins, G. V.; Ribeiro, M. V.; Machado, J. P B
Bond strength of a resin cement to high-alumina and zirconia-reinforced ceramics: The effect of surface conditioning Federal University of Santa Maria; University of Groningen; Materials Science and Technology Center; Universidade Estadual Paulista (UNESP); University of Bologna; University of Passo Fundo; Faculty of Medical Sciences (2006-07-13)Purpose: The aim of this study was to evaluate the effect of two surface conditioning methods on the microtensile bond strength of a resin cement to three high-strength core ceramics: high alumina-based (In-Ceram Alumina, ...