PMID: 18717169Aug 23, 2008Paper

Mechanical properties of dental zirconia ceramics changed with sandblasting and heat treatment

Dental Materials Journal
Hideo SatoSeiji Ban

Abstract

Two types of tetragonal zirconia polycrystals (TZP), a ceria-stabilized TZP/Al2O3 nanocomposite (CZA) and a conventional yttria-stabilized TZP (Y-TZP), were sandblasted with 70-microm alumina and 125-microm SiC powders, then partially annealed at 500-1200 degrees C for five minutes. Monoclinic ZrO2 content was determined by X-ray diffractometry and Raman spectroscopy. Biaxial flexure test was conducted on the specimens before and after the treatments. Monoclinic ZrO2 content and biaxial flexure strength increased after sandblasting, but decreased after heat treatment. However, in both cases, the strength of CZA was higher than that of Y-TZP. Raman spectroscopy showed that a compressive stress field was introduced on the sample surface after sandblasting. It was concluded that sandblasting induced tetragonal-to-monoclinic phase transformation and that the volume expansion associated with such a phase transformation gave rise to an increase in compressive stress on the surface of CZA. With the occurrence of such a strengthening mechanism in the microstructure, it was concluded that CZA was more susceptible to stress-induced transformation than Y-TZP.

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Citations

Jul 26, 2011·Lasers in Medical Science·Meryem Gülce Subaşı, Özgür İnan
Aug 1, 2013·Dental Materials : Official Publication of the Academy of Dental Materials·Shaymaa E Elsaka
Sep 12, 2013·Dental Materials : Official Publication of the Academy of Dental Materials·Alexandra GrigoreUlrich Lohbauer
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Sep 30, 2010·Dental Materials Journal·Makoto NodaSeiji Ban
Apr 10, 2010·Dental Materials Journal·Yuji OkudaSeiji Ban
Jul 23, 2011·Dental Materials Journal·Kazuo OhkumaHideo Ogura
May 2, 2014·Journal of Materials Science. Materials in Medicine·Cedomir OblakTomaz Kosmac
Jun 26, 2014·Dental Materials : Official Publication of the Academy of Dental Materials·Evaggelia PapiaPer Vult von Steyern
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Mar 30, 2013·Dental Materials : Official Publication of the Academy of Dental Materials·Dan LiuChi-Wai Kan
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