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Volume 23 , Issue 1
January/February 2010

Pages 5659

Reliability and Fatigue Damage Modes of Zirconia and Titanium Abutments

Miltiadis E. Mitsias, DDS, MSc/Nelson R.F.A. Silva, DDS, MSc, PhD/Mitchel Pines, DDS/Christian Stappert, DDS MSc, PhD/Van P. Thompson, DDS, PhD

PMID: 20234894

The fracture strength and accelerated fatigue reliability of metal and zirconia abutment systems were tested. Implants with either titanium (Ti, n = 9) or zirconia abutments (Zr, n = 18) were restored with metal crowns. Loads were applied as either a monotonic load to failure or mouth-motion cycles using a step-stress accelerated life testing method. At failure, monotonic loads were 1,475 625 N for Ti and 690 430 N for Zr. In step-stress testing, the Ti group was truncated at 70,000 cycles and a 900-N load with no fractures. In the Zr group, eight specimens survived and seven failed, with a maximum load of 400 N. Strength and reliability were significantly higher for the Ti abutments compared to the Zr. Int J Prosthodont 2010;23:5659.

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