Reliability and fatigue damage modes of zirconia and titanium abutments.
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;23:56-59.
Department of Biomaterials and Biomimetics, New York University College of Dentistry (NYUCD), New York, USA. mmitsias@msn.com
Miltiadis E
ME
Mitsias
Nelson R F A
NR
Silva
Mitchel
M
Pines
Christian
C
Stappert
Van P
VP
Thompson
D000044:Dental Abutments; D015921:Dental Implants; D003776:Dental Porcelain; D019232:Dental Restoration Failure; D003799:Dental Stress Analysis; D008422:Materials Testing; D014025:Titanium; D015019:Yttrium; D015040:Zirconium
D015921:Dental Implants; C499362:yttria stabilized tetragonal zirconia; D003776:Dental Porcelain; D015019:Yttrium; D015040:Zirconium; D014025:Titanium