Competition of fracture mechanisms in monolithic dental ceramics: Flat model systems

Yu Zhang, Jae Won Kim, Sanjit Bhowmick, P. Van Thompson, E. Dianne Rekow

Research output: Contribution to journalArticle

Abstract

Monolithic (single layer) glass-ceramic restorations often fail from chipping and fracture. Using blunt indentation of a model flat porcelain-like brittle layer bonded onto a dentin-like polymer support system, a variety of fatigue fracture modes has been identified and analyzed: outer cone, inner cone, and median cracks developing in the near-contact region at the occlusal surface; radial cracks developing at the internal cementation surface along the loading axis. Our findings indicate that monolithic glass-ceramic layers are vulnerable to both occlusal surface damage and cementation internal surface fracture. Clinical issues in the longevity of ceramic restorations are discussed in relation to biting force, physical properties of ceramic crowns and luting cement, and thicknesses of ceramic and cement layers.

Original languageEnglish (US)
Pages (from-to)402-411
Number of pages10
JournalJournal of Biomedical Materials Research - Part B Applied Biomaterials
Volume88
Issue number2
DOIs
StatePublished - Feb 2009

Keywords

  • Cementation radial fracture
  • Fatigue loading
  • Llayered ceramic structures
  • Occlusal cone fracture

ASJC Scopus subject areas

  • Biomaterials
  • Biomedical Engineering

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