Microstructure and mechanical property of a new IPS-Empress 2 dental glass-ceramic.
- Author:
Xiao-ping LUO
1
;
D C WATTS
;
N H F WILSON
;
N SILSONS
;
Ya-qin CHENG
Author Information
- Publication Type:Journal Article
- MeSH: Aluminum Silicates; chemistry; Compressive Strength; Dental Porcelain; chemistry; Materials Testing; Microscopy, Electron, Scanning; Tensile Strength; X-Ray Diffraction
- From: Chinese Journal of Stomatology 2005;40(2):147-149
- CountryChina
- Language:Chinese
-
Abstract:
OBJECTIVETo investigate the microstructure and mechanical properties of a new IPS-Empress 2 dental glass-ceramic.
METHODSAFM, SEM and XRD were used to analyze the microstructure and crystal phase of IPS-Empress 2 glass-ceramic. The flexural strength and fracture toughness were tested using 3-point bending method and indentation method respectively.
RESULTSIPS-Empress 2 glass-ceramic mainly consisted of lithium disilicate crystal, lithium phosphate and glass matrix, which formed a continuous interlocking structure. The crystal phases were not changed before and after hot-pressed treatment. AFM showed nucleating agent particles of different sizes distributed on the highly polished ceramic surface. The strength and fracture toughness were 300 MPa and 3.1 MPam(1/2).
CONCLUSIONThe high strength and fracture toughness of IPS-Empress 2 glass ceramic are attributed to the fine lithium disilicate crystalline, interlocking microstructure and crack deflection.
