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

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

Zirconium, powder, −100 mesh

Sigma-Aldrich

Yttrium, chips, 99.9% trace rare earth metals basis

Sigma-Aldrich

Zirconium, foil, thickness 0.1 mm, 99.98% trace metals basis

Sigma-Aldrich

Zirconium, sponge, ≥99% trace metals basis

Sigma-Aldrich

Zirconium, rod, diam. 6.35 mm, ≥99% trace metals basis

Zirconium, foil, not light tested, 25x25mm, thickness 0.003mm, 99.2%

Zirconium, foil, light tested, 50x50mm, thickness 0.015mm, 99.2%

Zirconium, foil, light tested, 25x25mm, thickness 0.006mm, 99.2%

Zirconium, foil, 8mm disks, thickness 0.25mm, annealed, 99.2%

Zirconium, foil, 8mm disks, thickness 0.5mm, annealed, 99.2%

Zirconium, foil, 6mm disks, thickness 0.075mm, annealed, 99.2%

Zirconium, foil, light tested, 25x25mm, thickness 0.01mm, 99.2%

Zirconium, foil, 4mm disks, thickness 0.01mm, 99.2%

Zirconium, foil, 4mm disks, thickness 0.25mm, annealed, 99.2%

Zirconium, foil, 6mm disks, thickness 0.25mm, annealed, 99.2%

Zirconium, foil, light tested, 50x50mm, thickness 0.05mm, annealed, 99.2%

Zirconium, foil, 50mm disks, thickness 0.25mm, annealed, 99.2%

Zirconium, foil, light tested, 25x25mm, thickness 0.01mm, 99.2%

Zirconium, foil, 6mm disks, thickness 0.01mm, 99.2%

Zirconium, foil, 50mm disks, thickness 0.016mm, 99.2%

Zirconium, foil, light tested, 50x50mm, thickness 0.008mm, 99.2%

Yttrium, foil, not light tested, 100x100mm, thickness 0.025mm, as rolled, 99%

Zirconium, foil, not light tested, 25x25mm, thickness 0.005mm, 99.2%

Zirconium, foil, light tested, 50x50mm, thickness 0.01mm, 99.2%

Zirconium, foil, light tested, 200x300mm, thickness 0.02mm, 99.2%

Zirconium, foil, 4mm disks, thickness 0.075mm, annealed, 99.2%

Zirconium, foil, 6mm disks, thickness 0.009mm, 99.2%

Zirconium, foil, 25mm disks, thickness 0.125mm, annealed, 99.2%

Zirconium, foil, 2m coil, thickness 0.075mm, annealed, 99.2%

Zirconium, foil, 5m coil, thickness 0.025mm, annealed, 99.2%