PMID- 25588178 OWN - Quintessenz Verlags-GmbH CI - Copyright Quintessenz Verlags-GmbH OCI - Copyright Quintessenz Verlags-GmbH TA - Int J Prosthodont JT - The International Journal of Prosthodontics IS - 1942-4426 (Electronic) IS - 0893-2174 (Print) IP - 1 VI - 28 PST - ppublish DP - 2015 PG - 75-78 LA - en TI - Reliability and Failure Modes of Two Y-TZP Abutment Designs LID - 10.11607/ijp.3879 [doi] FAU - Mitsias, Miltiadis E. AU - Mitsias M FAU - Thompson, Van P. AU - Thompson V FAU - Pines, Mitchel AU - Pines M FAU - Silva, Nelson R. F. A. AU - Silva N CN - AB - Fracture strength and accelerated fatigue reliability of two zirconia abutment systems were tested. Thirty-six implants with a Morse taper (MT; n = 18) or cone (C; n = 18) design were restored with metallic crowns. Loads were applied as single load to failure (SLF) or mouth-motion cycles using a step-stress accelerated life testing (SALT) method. SLF mean values were 690 ± 430 N and 209 ± 25 for MT and C groups, respectively. In terms of the SALT results, 8 specimens survived (50,000 cycles) and 7 failed (maximum load 400 N) in the MT group; whereas for the C group all abutments failed before the maximum number of cycles. Failure mode was fracture of the Y-TZP abutments for both groups. Higher reliability for a mission of 50,000 cycles at 175 N for MT versus C designs was determined, and significant differences in fracture modes were observed. AID - 849639