Shear bond strength of veneering porcelain to zirconia: Effect of surface treatment by CNC-milling and composite layer deposition on zirconia

• Autor(a) principal: Nascimento, Rubens Maribondo do
• Data de Publicação: 2016
• Outros Autores: Santos, Rafaela Luiz Pereira, Silva, Filipe Samuel, Souza, Júlio César Matias de, Motta, Fabiana Villela da, Carvalho, Oscar, Henriques, Bruno
• Tipo de documento: Artigo
• Idioma: eng
• Título da fonte: Repositório Institucional da UFRN
• Texto Completo: https://repositorio.ufrn.br/handle/123456789/45569
• topic: Zirconia; Feldspathic porcelain; Shear bond strength; Composite interlayer; CNC-created surface holes

Objectives: The purpose of this study was to evaluate the shear bond strength of veneering feldspathic porcelain to zirconia substrates modified by CNC-milling process or by coating zirconia with a composite interlayer. Methods: Four types of zirconia–porcelain interface configurations were tested: RZ – porcelain bonded to rough zirconia substrate (n1⁄416); PZ – porcelain bonded to zirconia substrate with surface holes (n1⁄416); RZI – application of a composite interlayer between the veneering porcelain and the rough zirconia substrate (n1⁄416); PZI – application of a composite interlayer between the porcelain and the zirconia substrate treated by CNC-milling (n1⁄416). The composite interlayer was composed of zirconia particles reinforced porcelain (30%, vol%). The mechanical properties of the ceramic composite have been determined. The shear bond strength test was performed at 0.5 mm/min using a universal testing machine. The interfaces of fractured and untested specimens were examined by FEG-SEM/EDS. Data was analyzed with Shapiro–Wilk test to test the assumption of normality. The one-way ANOVA followed by Tukey HSD multiple comparison test was used to compare shear bond strength results (α1⁄40.05). Results: The shear bond strength of PZ (100715 MPa) and RZI (96711 MPa) specimens were higher than that recorded for RZ (control group) specimens (89715 MPa), although not significantly (p40.05). The highest shear bond strength values were recorded for PZI specimens (138719 MPa), yielding a significant improvement of 55% relative to RZ specimens (po0.05)