Microstructure and mechanical property of new IPS-Empress 2 dental glass-ceramic
Objective: The purpose of this study was to investigate the microstructure and mechanical property of new IPS-Empress 2 dental glass-ceramic. Methods: AFM, SEM and XRD were used to analyse the microstructure and crystalline phase of IPS-Empress 2 glass-ceramic. The flexural strength and fracture toughness were tested by 3-point bending method and indentation method respectively. Results: IPS-Empress 2 glass ceramic mainly consists of lithium disilicate crystal, lithium phosphate and glass matrix, which form continue interlocking structure. The crystal phase and structure were not changed after hot-pressed treatment. AFM showed nucleating agent particles of different sizes distributed in the highly polished ceramic surface. The strength and fracture toughness were 300 MPa and 3.1MPam1/2. Conclusions: The high strength and fracture toughness of IPS-Empress 2 glass ceramic are attributed to the fine lithium dislicate crystal, interlocking microstructure and crack deflection.
Division: Chinese Division Meeting
Meeting:2004 Chinese Division Meeting (Wuhan, China) Location: Wuhan, China
Year: 2004 Final Presentation ID:0 Abstract Category|Abstract Category(s):Scientific Groups
Authors
Luo, Xiaoping
( University of Nanjing, Nanjing City, N/A, China
)
Watts, David C
( University of Manchester, Manchester, N/A, United Kingdom
)
Wilson, Nairn H F
( Dental Institute, King's College London, London, N/A, United Kingdom
)
SESSION INFORMATION
Oral Session
Dental Materials: III - Ceramics and Cements