Sliding contact fatigue of graded zirconia with external esthetic glass

L. Ren, M. N. Janal, Y. Zhang

Research output: Contribution to journalArticlepeer-review


Veneer chipping and fracture are common failure modes for porcelain-veneered zirconia dental restorations. We hypothesized that the graded glass/zirconia/glass with external esthetic glass (e-GZG) can increase the lifetime and improve resistance to veneer chipping and fracture relative to porcelainveneered zirconia, while providing necessary esthetics. Previously, we have demonstrated that a graded glass-zirconia surface possesses excellent resistance to occlusal-like sliding contact fatigue. Here, we investigated the sliding contact fatigue response of this graded glass-zirconia surface with external esthetic glass. This external glass is essential for shade options, for preventing excessive wear of opposing dentition, and for protecting Y-TZP from hydrothermal degradation. e-GZG plates were bonded to composite blocks and subjected to prolonged sliding contact up to 10 million cycles at 200 N in water. The resistance to sliding contact fatigue of e-GZG matches that of monolithic Y-TZP, and both of these materials demonstrated lifetimes that were orders of magnitude longer than that of porcelain-veneered zirconia. Graded e-GZG is a promising restorative material.

Original languageEnglish (US)
Pages (from-to)1116-1121
Number of pages6
JournalJournal of dental research
Issue number9
StatePublished - Sep 2011


  • allceramic restorations
  • external esthetic glass
  • fatigue damage
  • graded glass-zirconia structure
  • modulus gradient
  • sliding contact loading

ASJC Scopus subject areas

  • General Dentistry


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