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Viscoelastic analysis of a dental metal-ceramic system

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Abstract

Porcelain-fused-to-metal (PFM) restorations used in prosthetic dentistry contain thermal stresses which develop during the cooling phase after firing. These thermal stresses coupled with the stresses produced by mechanical loads may be the dominant reasons for failures in clinical situations. For an accurate calculation of these stresses, viscoelastic behavior of ceramics at high temperatures should not be ignored.

In this study, the finite element technique is used to evaluate the effect of viscoelasticity on stress distributions of a three-point flexure test specimen, which is the current international standard, ISO 9693, to characterize the interfacial bond strength of metal-ceramic restorative systems. Results indicate that the probability of interfacial debonding due to normal tensile stress is higher than that due to shear stress. This conclusion suggests modification of ISO 9693 bond strength definition from one in terms of the shear stress only to that accounting for both normal and shear stresses.

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Acknowledgements

Şebnem Özüpek and Utku Cemal Ünlü gratefully acknowledge the financial support of the Scientific Research Projects Fund of Boğaziçi University.

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Authors and Affiliations

  1. Department of Mechanical Engineering, Boğaziçi University, Bebek, Istanbul, 34342, Turkey

    Şebnem Özüpek & Utku Cemal Ünlü

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  1. Şebnem Özüpek
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  2. Utku Cemal Ünlü
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Correspondence to Şebnem Özüpek.

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Özüpek, Ş., Ünlü, U.C. Viscoelastic analysis of a dental metal-ceramic system. Mech Time-Depend Mater 16, 427–437 (2012). https://doi.org/10.1007/s11043-012-9170-4

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  • DOI: https://doi.org/10.1007/s11043-012-9170-4

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