Fatigue Fracture Strength of Implant-Supported Full Contour Zirconia and Metal Ceramic Fixed Partial Dentures

  • Fariborz Vafaee Mail Associate Professor, Implant Research Center, Department of Prosthodontics, School of Dental Medicine, Hamedan University of Medical Sciences, Hamedan, Iran
  • Farnaz Firouz Assistant Professor, Department of Prosthodontics, School of Dental Medicine, Hamedan University of Medical Sciences, Hamedan, Iran
  • Masoumeh Khoshhal Assistant Professor, Implant Research Center, Department of Periodontics, School of Dental Medicine, Hamedan University of Medical Sciences, Hamedan, Iran
  • Amirarsalan Hooshyarfard Postgraduate Student, Department of Periodontics, School of Dental Medicine, Hamedan University of Medical Sciences, Hamedan, Iran
  • Armaghan Shahbazi Postgraduate Student, Department of Prosthodontics, School of Dental Medicine, Hamedan University of Medical Sciences, Hamedan, Iran
  • Ghodratollah Roshanaei Associate Professor, Modeling of Noncommunicable Diseases Research Center, Department of Biostatistics and Epidemiology, School of Public Health, Hamedan University of Medical Sciences, Hamedan, Iran
Fatigue, Zirconium Oxide, Co-Cr Alloy, Fracture Strength


Objectives: Zirconia restorations have been suggested as a more durable and more appealing alternative to metal restorations. However, their mechanical properties may be negatively affected by fatigue due to superficial stresses or low temperature degradation. This study aimed to assess the fatigue fracture strength of three-unit implant-supported full contour zirconia and pre-sintered cobalt-chromium (Co-Cr) alloy posterior fixed partial dentures (FPDs).
Materials and Methods: In this in-vitro experimental study, 28 posterior three-unit implant-supported FPDs were fabricated of full contour zirconia and pre-sintered Co-Cr alloy, and were cemented on implant abutments. To simulate the oral environment, FPDs were subjected to 10,000 thermal cycles between 5-55°C for 30 seconds, and were then transferred to a chewing simulator (100,000 cycles, 50 N, 0.5 Hz). Afterwards, fatigue fracture strength was measured using a universal testing machine. Data were analyzed by Mann-Whitney U test.
Results: The mean and standard deviation of fracture strength were 2108.6±440.1 N in full contour zirconia, and 3499.9±1106.5 N in pre-sintered Co-Cr alloy. According to Mann- Whitney U test, the difference in this respect was statistically significant between the two groups (P=0.007).
Conclusions: Since the fracture strength values obtained in the two groups were significantly higher than the maximum mean masticatory load in the oral environment, both materials can be used for fabrication of posterior three-unit FPDs, depending on the esthetic demands of patients.


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How to Cite
Vafaee F, Firouz F, Khoshhal M, Hooshyarfard A, Shahbazi A, Roshanaei G. Fatigue Fracture Strength of Implant-Supported Full Contour Zirconia and Metal Ceramic Fixed Partial Dentures. Front Dent. 14(3):165-172.
Original Article