The Journal of Advanced Prosthodontics

The Korean Academy of Prosthodonitics (대한치과보철학회)
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Biaxial flexural strength and phase transformation of Ce-TZP/$Al_2O_3$ and Y-TZP core materials after thermocycling and mechanical loading

  • Gungor, Merve Bankoglu (Department of Prosthodontics, Faculty of Dentistry, Gazi University) ;
  • Yilmaz, Handan (Department of Prosthodontics, Faculty of Dentistry, Gazi University) ;
  • Aydin, Cemal (Department of Prosthodontics, Faculty of Dentistry, Gazi University) ;
  • Nemli, Secil Karakoca (Department of Prosthodontics, Faculty of Dentistry, Gazi University) ;
  • Bal, Bilge Turhan (Department of Prosthodontics, Faculty of Dentistry, Gazi University) ;
  • Tiras, Tulay (Department of Physics, Faculty of Science, Anadolu University)
  • Received : 2013.12.19
  • Accepted : 2014.05.07
  • Published : 2014.06.30
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Abstract

PURPOSE. The purpose of the present study was to evaluate the effect of thermocycling and mechanical loading on the biaxial flexural strength and the phase transformation of one Ce-TZP/$Al_2O_3$ and two Y-TZP core materials. MATERIALS AND METHODS. Thirty disc-shaped specimens were obtained from each material. The specimens were randomly divided into three groups (control, thermocycled, and mechanically loaded). Thermocycling was subjected in distilled water for 10000 cycles. Mechanical loading was subjected with 200 N loads at a frequency of 2 Hz for 100000 times. The mean biaxial flexural strength and phase transformation of the specimens were tested. The Weibull modulus, characteristic strength, 10%, 5% and 1% probabilities of failure were calculated using the biaxial flexural strength data. RESULTS. The characteristic strengths of Ce-TZP/$Al_2O_3$ specimens were significantly higher in all groups compared with the other tested materials (P<.001). Statistical results of X-ray diffraction showed that thermocycling and mechanical loading did not affect the monoclinic phase content of the materials. According to Raman spectroscopy results, at the same point and the same material, mechanical loading significantly affected the phase fraction of all materials (P<.05). CONCLUSION. It was concluded that thermocycling and mechanical loading did not show negative effect on the mean biaxial strength of the tested materials.

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References

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