Damage maps for layered ceramics under simulated mastication

J. H. Kim, J. W. Kim, S. W. Myoung, M. Pines, Y. Zhang

Research output: Contribution to journalArticlepeer-review


Ceramic restorations, whether monolithic (single layer) or porcelain-veneered, often chip and fracture from repeated occlusal loading. Occlusion involves the opposing tooth sliding along the cuspal incline surface with an applied biting force (off-axis loading). We hypothesized that off-axis contact-load-slide-liftoff fatigue, as compared with normal axial fatigue loading, produces different fracture modes and fatigue lifespans of layered ceramics. Monolithic glass plates were epoxy-bonded to polycarbonate substrates as a transparent model for an all-ceramic crown on dentin. Off-axis and axial (control) cyclic loading was applied through a hard sphere in water, with a mouth-motion machine. The off-axis loading is more deleterious for contact-induced occlusal surface fracture, but less harmful for flexure-induced cementation surface fracture of brittle layers than the axial loading. This is because of the tangential load component associated with the off-axis loading. Clinical relevance is discussed.

Original languageEnglish (US)
Pages (from-to)671-675
Number of pages5
JournalJournal of dental research
Issue number7
StatePublished - Jul 2008


  • Cementation radial fracture
  • Fatigue
  • Layered ceramic structures
  • Occlusal partial cone fracture
  • Off-axis loading

ASJC Scopus subject areas

  • General Dentistry


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