Effect of Crystallinity on Strength and Fracture Toughness of Li2O-Al2O3-CaO-SiO2 Glass-Ceramics |
| |
Authors: | Kenneth J. Anusavice Nai-zheng Zhang |
| |
Affiliation: | Department of Dental Biomaterials, College of Dentistry, University of Florida, Gainesville, Florida 32610-0446 |
| |
Abstract: | The influence of crystal volume fraction on fracture toughness ( K I C ) and indentation strength was analyzed for Li2O-Al2O3-CaO-SiO2 (LACS) and LACS glass-ceramics containing 0.58 mmol% AgNO3 (LACS-0.58Ag) or 0.78 mmol% AgNO3 (LACS-0.78Ag). The mean flexure strength, indentation strength, and KI C values of the LACS-0.78Ag groups increased with volume fraction of crystallinity. To achieve the greatest strength and KI C in LACS-Ag specimens, a high volume fraction of crystallinity (95%) had to be produced. However, the relationship between volume fraction of crystal phase and translucency had to be analyzed to determine the influence of crystallization on the potential esthetic results that are essential for dental applications. Addition of AgNO3 to LACS glass produced a change from surface crystallization to bulk crystallization. |
| |
Keywords: | |
|
|