Resistência de união entre zircônia (Y-TZP) e cerâmica de cobertura após diferentes tratamentos de superfície (plasma de baixa temperatura (experimental), liner e jateamento com diferentes granulações de óxidos de alumínio)

• Autor(a) principal: Camargo, Danielle de Almeida [UNESP]
• Data de Publicação: 2017
• Tipo de documento: Trabalho de conclusão de curso
• Idioma: por
• Título da fonte: Repositório Institucional da UNESP
• Texto Completo: http://hdl.handle.net/11449/156635; http://www.athena.biblioteca.unesp.br/exlibris/bd/capelo/2018-06-12/000900649.pdf
• topic: Zircônio; Cerâmica; Gases em plasma; Resistência ao cisalhamento; Zirconium

The obtainment of a durable zirconia/veneer ceramic interface bond is a preoccupation for clinical success of metal-free restorations. However, in the existing evidences indicates that the technique with improved predictability and durability has not yet been determined. To increase the bond strength between the yttria stabilized tetragonal zirconia (Y-TZP) to the veneer ceramic and, consequently, reduce the incidence of shear fractures during the life of the prosthesis, several Y-TZP zirconia surface treatments were proposed prior to the coating process. A new method of surface treatment of zirconia using a plasma enhanced chemical vapor deposition (PECVD) is advancing in the researches in order to obtain better knowledge and results. The aim of the present study was to evaluate the bond strength between the zirconia (without and with surface treatments) to the veneer ceramic after 24 hours of storage in distilled water at room temperature. For this, a total of 60 Y-TZP samples (13×5.4×5 mm) were divided in 6 groups, according the surface treatment: control - no treatment (C), airborne-particle with 27 μm aluminum oxide (Al27), airborne-particle with 110 μm aluminum oxide (Al110), airborne-particle with 250 μm aluminum oxide (Al250), zirconia liner (L) and the film by PECVD (P). The bond strength test between the zirconia and the cover ceramic was performed in a universal test machine (Instron Model 4400 Universal Testing System, Instron Coorporation) using a transverse velocity of 1 mm/min at the zirconia / veneer ceramic interface. The samples were submitted to the bond strength test after 24 hours storage at room temperature. The data were submitted to the test of adherence to the normal curve and submitted to analysis of variance and Tukey HSD test (α = 0.05). The shear strength between Y-TZP and cover...