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May 6, 2026European Journal Of Oral Sciences0 citationsOpen Access

Improving fatigue resistance of translucent 4Y‐PSZ zirconia through glass gradation

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FSFelipe Machado de SouzaLALarissa M.M. AlvesESEdisa O. Sousa

Key Points

  • This research aims to improve the fatigue resistance and mechanical reliability of translucent zirconia through the use of glass gradation.
  • Investigated the impact of glass gradation on 4Y-PSZ zirconia performance under fatigue stress.
  • Conducted fractography analyses to assess failure mechanisms in glass-graded and control specimens.
  • Evaluated the effects of hydrothermal aging on mechanical performance of zirconia.
  • Mechanical performance was maintained despite hydrothermal aging in glass-graded specimens.
  • Fractography indicated different failure modes between glass-graded and control zirconia samples.
  • Glass gradation enhanced fatigue reliability and characteristic strength without compromising stability.

Abstract

values suggested similar life-stress relationships. Hydrothermal aging did not significantly affect mechanical performance, although phase transformation occurred in the control group. Fractography revealed surface-initiated failures in controls and interface-related crack initiation in glass-graded specimens. Graded glass infiltration improved the fatigue reliability and characteristic strength without compromising hydrothermal stability of 4Y-PSZ. These results suggest that glass-graded 4Y-PSZ may expand the clinical applicability of translucent zirconia for long-span (≥4-unit) prosthetic reconstructions.

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Cite This Study

Souza et al. (2026) studied this question.

synapsesocial.com/papers/69fa983604f884e66b532104https://doi.org/10.1111/eos.70101
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  4. 4Impact of Mechanical and Thermal Aging on the Surface Integrity and Optical Stability of 4Y and 5Y High-translucency Zirconia: A Comparative Study2026
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