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Investigation of the Effects of Multiple Firing and Thermal Aging Processes on the Mechanical Propery of Zirconia Core Materials

Purpose: It is thought that the most detrimental effect on the long-term mechanical behavior of zirconia ceramics in the oral cavity is temperature and humidity factors. This decay facilitates in a humid atmosphere; The slow conversion of the metastable tetragonal phase to the monoclinic phase. To investigate the effect of number of firings and aging on the mechanical property of zirconium substructured restorations in-vitro. Materials and Methods: Zirconia infrastructure (Vita İncream and Ceramill ZI glass) ceramics belonging to two different systems were used. 50 zirconia discs with a diameter of 12.0 mm and a height of 1.2±0.2 mm were prepared from zirconium infrastructure blocks stabilized with yttrium in accordance with the ISO 6872 standard, and each group was divided into five subgroups according to the number of firing and thermal aging (n=10). Fracture test were applied to the samples, which were aged for 10000 cycles in the aging device. The obtained data were statistically evaluated with one-way analysis of variance Kruskall-Walis tests. Results: As a result of the statistical analysis, there was no statistically significant difference in the biaxial flexural strength values of the Vita In-Ceram YZ and Ceramill Zİ ceramic materials in the thermal aging process applied as a result of firing processes repeated 1, 3 and 5 times.

Fatih Çetin
Dicle University, Dental Faculty-Diyarbakir
Turkey

Ayşe Meşe
Dicle University, Dental Faculty-Diyarbakir
Turkey

 


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