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Lifetime of alumina‐ and zirconia ceramics used for crown and bridge restorations
Author(s) -
Tinschert Joachim,
Natt Gerd,
Mohrbotter Nina,
Spiekermann Hubertus,
Schulze Karen A.
Publication year - 2007
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.30599
Subject(s) - materials science , cubic zirconia , weibull modulus , crown (dentistry) , composite material , weibull distribution , ceramic , fracture toughness , bridge (graph theory) , fracture mechanics , dental porcelain , flexural strength , aluminum oxide , forensic engineering , aluminium , engineering , mathematics , medicine , statistics
The lifetime of a ceramic is dependent on the presence of incidental cracks and their gradual propagation under the conditions of the oral cavity. The objective of this study was to examine the long‐term strength of glass‐infiltrated alumina‐ and various zirconia ceramics currently used in CAD/CAM systems to manufacture crown and bridge frameworks. Fracture mechanics were applied to determine characteristic strength ( σ o ), Weibull modulus ( m ), fracture toughness ( K Ic ), and the subcritical crack growth parameters n and B . Based on these parameters, lifetime diagrams were generated which allowed the evaluation of the long‐term behavior. The results showed that in a moist environment, the glass‐infiltrated alumina‐ and some zirconia ceramics have a high susceptibility to subcritical crack growth. Zirconia ceramics with an alumina oxide content of 0.25 wt %, however, exhibited the highest initial and most favorable long‐term strength, and should therefore be suitable for crown and bridge restorations. © 2006 Wiley Periodicals, Inc. J Biomed Mater Res Part B: Appl Biomater, 2007