Effect of glaze cooling rate on mechanical properties of conventional and pressed porcelain on zirconia
| Autor: | Renata Garcia Fonseca, Diogo Longhini, Igor Studart Medeiros, Gelson Luis Adabo, Cibele Oliveira de Melo Rocha |
|---|---|
| Přispěvatelé: | Universidade Estadual Paulista (Unesp), Universidade de São Paulo (USP) |
| Jazyk: | angličtina |
| Rok vydání: | 2016 |
| Předmět: |
Materials science
Scanning electron microscope Glaze Temperature 030206 dentistry 02 engineering and technology 021001 nanoscience & nanotechnology Microstructure Dental Porcelain 03 medical and health sciences 0302 clinical medicine Dental porcelain Fracture toughness Flexural strength Residual stress Material resistance Materials Testing Cubic zirconia Zirconium Composite material 0210 nano-technology General Dentistry |
| Zdroj: | Scopus Repositório Institucional da UNESP Universidade Estadual Paulista (UNESP) instacron:UNESP Brazilian Dental Journal, Volume: 27, Issue: 5, Pages: 524-531, Published: OCT 2016 Brazilian Dental Journal v.27 n.5 2016 Brazilian Dental Journal Fundação Odontológica de Ribeirão Preto (FUNORP) instacron:FUNORP |
| Popis: | The aim of this study was to characterize a conventional and a pressed porcelain for zirconia core as to biaxial flexural strength (BFS), apparent fracture toughness (FT) and microstructure composition, and to investigate the effect of glaze cooling rate on the BFS of the zirconia/porcelain bilayers. Monolayers of conventional porcelain Vita VM9 and pressed porcelain Vita PM9 (n=15) (12 mm diameter x 1.2 mm thick) were prepared for the BFS test (MPa). Apparent fracture toughness (MPa.m1/2) was measured by indentation technique (n=15). t-Student test was performed for statistical analysis. Scanning electron microscopy and x-ray diffraction were used to analyze the porcelain's microstructure. For the BFS of bilayers, zirconia discs (12 mm diameter x 1 mm thick) (Vita In-Ceram YZ) were veneered with the two porcelains (1 mm thick). After the glaze firing simulation, the specimens were submitted to fast or slow cooling (n=15). Apparent fracture toughness (MPa.m1/2) was measured on the porcelain surface of bilayers (n=15) and residual stress was calculated. Two-way ANOVA (porcelain and cooling method) was used for the bilayer analysis (a=0.05). Vita PM9 monolayer exhibited significantly higher BFS (p |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|