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Reliability and failure modes of two Y-TZP abutment designs.

The International journal of prosthodontics (2015-01-15)
Miltiadis E Mitsias, Van P Thompson, Mitchel Pines, Nelson R F A Silva
ABSTRACT

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.

MATERIALS
Product Number
Brand
Product Description

Sigma-Aldrich
Yttrium sputtering target, diam. × thickness 2.00 in. × 0.25 in., 99.9% trace metals basis
Zirconium, foil, 50mm disks, thickness 0.05mm, annealed, 99.2%
Zirconium, foil, light tested, 25x25mm, thickness 0.025mm, annealed, 99.2%
Zirconium, foil, 25mm disks, thickness 0.5mm, annealed, 99.2%
Zirconium, foil, light tested, 100x100mm, thickness 0.025mm, annealed, 99.2%
Zirconium, foil, not light tested, 150x150mm, thickness 0.009mm, 99.2%
Zirconium, foil, 6mm disks, thickness 0.015mm, 99.2%
Zirconium, foil, light tested, 50x50mm, thickness 0.0125mm, 99.2%
Zirconium, foil, 4mm disks, thickness 0.075mm, annealed, 99.2%
Zirconium, foil, light tested, 25x25mm, thickness 0.006mm, 99.2%
Zirconium, foil, not light tested, 50x50mm, thickness 0.001mm, 99.2%
Zirconium, foil, 6mm disks, thickness 0.5mm, annealed, 99.2%
Zirconium, foil, not light tested, 100x100mm, thickness 0.004mm, 99.2%
Zirconium, foil, 50mm disks, thickness 0.075mm, annealed, 99.2%
Zirconium, foil, light tested, 25x25mm, thickness 0.02mm, 99.2%
Zirconium, foil, 2m coil, thickness 0.025mm, annealed, 99.2%
Zirconium, foil, 4mm disks, thickness 0.009mm, 99.2%
Zirconium, foil, light tested, 150x150mm, thickness 0.025mm, annealed, 99.2%
Zirconium, foil, not light tested, 25x25mm, thickness 0.003mm, 99.2%
Zirconium, foil, 8mm disks, thickness 0.075mm, annealed, 99.2%
Zirconium, foil, 6mm disks, thickness 0.016mm, 99.2%
Zirconium, foil, light tested, 50x50mm, thickness 0.015mm, 99.2%
Zirconium, foil, 4mm disks, thickness 0.125mm, annealed, 99.2%
Zirconium, foil, light tested, 25x25mm, thickness 0.007mm, 99.2%
Yttrium, foil, 25mm disks, thickness 0.50mm, as rolled, 99%
Zirconium, foil, light tested, 100x100mm, thickness 0.016mm, 99.2%
Zirconium, foil, 8mm disks, thickness 0.009mm, 99.2%
Zirconium, foil, not light tested, 100x100mm, thickness 0.005mm, 99.2%
Zirconium, foil, light tested, 25x25mm, thickness 0.05mm, annealed, 99.2%
Zirconium, foil, 4mm disks, thickness 0.0125mm, 99.2%