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Competition of fracture mechanisms in monolithic dental ceramics: Flat model systems
Author(s) -
Zhang Yu,
Kim JaeWon,
Bhowmick Sanjit,
Thompson Van P.,
Rekow E. Dianne
Publication year - 2009
Publication title -
journal of biomedical materials research part b: applied biomaterials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.665
H-Index - 108
eISSN - 1552-4981
pISSN - 1552-4973
DOI - 10.1002/jbm.b.31100
Subject(s) - materials science , cementation (geology) , ceramic , composite material , fracture (geology) , indentation , brittleness , layer (electronics) , cement
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. © 2008 Wiley Periodicals, Inc. J Biomed Mater Res Part B: Appl Biomater, 2009