1. The effect of different aging protocols on the flexural strength and phase transformations of two monolithic zirconia ceramics.
- Author
-
Kelesi, Maria, Kontonasaki, Eleana, Kantiranis, Nikolaos, Papadopoulou, Lambrini, Zorba, Triantafyllia, Paraskevopoulos, K M, and Koidis, Petros
- Subjects
- *
PHASE transitions , *FLEXURAL strength , *ZIRCONIUM oxide , *FOURIER transform infrared spectroscopy , *THERMOCYCLING , *DETERIORATION of materials - Abstract
Introduction: The aim of the present study was to investigate how different aging protocols can affect the flexural strength and phase transformations of yttrium-stabilized zirconia ceramics (Y-TZP) for monolithic restorations. Materials and methods: Bar-shaped specimens from two zirconia ceramics bars were divided into three groups: a. no treatment (c), b. aging in an autoclave (a), and c. thermal cycling (t). The flexural strength was determined by the 3-point bending test and statistical analysis was performed to determine significant differences (p < 0.05). Weibull statistics was used to analyze the dispersion of strength values while surface microstructural analysis was performed through X-ray diffraction analysis (XRD), Fourier transform infrared spectroscopy (FTIR), and scanning electron microscopy (SEM). Results: Aging did not significantly affect the flexural strength but differences were recorded between the two groups, with group A presenting higher strength values and m-phase percentages. Conclusions: The observed differences between the two ceramics could be attributed to variations in composition and processing. [ABSTRACT FROM AUTHOR]
- Published
- 2020
- Full Text
- View/download PDF