| Autor: |
Ramos CM; Department of Dentistry, Endodontics and Dental Materials, Bauru School of Dentistry, University of São Paulo, Alameda Octávio Pinheiro Brisola, 9-75, Vila Universitária, Bauru SP, 17012-901, Brazil., Tabata AS, Cesar PF, Rubo JH, Fracisconi PA, Sanches Borges AF |
| Jazyk: |
angličtina |
| Zdroj: |
Applied spectroscopy [Appl Spectrosc] 2015 Jul; Vol. 69 (7), pp. 810-4. Date of Electronic Publication: 2015 Jun 01. |
| DOI: |
10.1366/14-07793 |
| Abstrakt: |
The aim of this study was to perform micro-Raman spectroscopy as an alternative and nondestructive method to identify the phase transformation of zirconia after mechanical stress. The groups evaluated were experimental zirconia, zirconcad, IPS e.max ZirCad, and In Ceram YZ. Ten specimens were constructed for each group (n = 30) and subjected to a three-point bending test with a crosshead speed of 0.5 mm/min. The fractured surfaces were analyzed by micro-Raman spectroscopy. The laser power was kept at 10 mW, and scanning was performed in three regions of the fractured surface: (i) near the source of the failure (region of tensile stress), (ii) central to the fractured surface, and (iii) far from the source of failure. All materials showed the characteristic bands of tetragonal and monoclinic phases of zirconia. All zirconia studied showed a monoclinic phase in the tensile stress region. Micro-Raman spectroscopy was effective in detecting the presence of crystalline phases in polycrystals ceramics. |
| Databáze: |
MEDLINE |
| Externí odkaz: |
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