Caracterização de uma cerâmica 3Y-TZP e avaliação do efeito de tratamentos de superfície na adesão da cerâmica ao glaze ou cimento resinoso

• Ano de defesa: 2015
• Autor(a) principal: Feitosa, Sabrina Alves [UNESP]
• Tipo de documento: Tese
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: Universidade Estadual Paulista (Unesp)
• Palavras-chave em Português: Cisalhamento; Adesão; Materiais dentários; Cimentos de resina; Dental materials
• Link de acesso: http://hdl.handle.net/11449/123710; http://www.athena.biblioteca.unesp.br/exlibris/bd/cathedra/18-05-2015/000827138.pdf

The aim of the present study was to evaluate the adhesive parameters between glaze and full-contour zirconia (FCZ) and overglazed FCZ and resin cement. Zirconia and glaze were tested to determined theirs properties. FCZ samples were divided into 5 groups: (GL) glaze application; (AL+GL) sandblasting with aluminum oxide + glaze; (CJ+GL) tribochemical silica coating (Cojet®) + glaze; (SP+GL) chemical surface treatment with piranha solution+glaze; (CJ) Cojet. Electron scanning microscopy (SEM) and atomic force microscopy (MFA) were performed to evaluate the FCZ topography. Scratch test was executed to evaluate the bonding between FCZ and glaze after the different surface pretreatment. For the bonding procedures the glazed groups [(GL), (AL+GL), (CJ+GL) and (SP+GL)] were etched with hydrofluoric acid (HF) and treated with a silane coupling agent and the group without glaze (CJ) was treated only with a silane. The resin cement was bonded to the zirconia surface using a dedicated device for the shear test (SBS). For the SBS test, half of the samples were tested after 24 h and the other half after storage and thermocycling. To evaluate the tensile retention of FCZ crowns cemented on epoxy resin (G10) specimens simulating fullcontour crowns were made. Pretreated groups [(GL), (CJ+GL), (SP+GL) and (CJ)] were bonded with a resin cement without MDP (Multilink Automix, 3M). The group without surface pretreatment (PF) was bonded with a MDP-based resin cement (Panavia F, Kuraray). The adhesive data were statistically analysed (ANOVA e Tukey test). FCZ showed high density, homogeneous microstructure and mechanical properties similar to the traditional zirconia. FCZ glaze was characterized as a leucite with irregular shape and size morphology. The scratch test pattern was similar for all the evaluated groups and classified as a cohesive failure of the glaze. The shear data suggested that the chemicall ...