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Unstable cracking (chipping) of veneering porcelain on all-ceramic dental crowns and fixed partial dentures

Paper ID Volume ID Publish Year Pages File Format Full-Text
1323 81 2009 10 PDF Available
Title
Unstable cracking (chipping) of veneering porcelain on all-ceramic dental crowns and fixed partial dentures
Abstract

The central argument of this study is that residual stresses developed during the preparation of all-ceramic crowns and fixed partial dentures coupled with contact-induced cracking are the origin of the excessive chipping observed in clinical applications. The aim of this paper is to provide a simple basic analysis of the causes of residual stress development in ceramics and identify the key thermo-mechanical parameters responsible for these stresses and the resultant contact-induced failure. For simplicity, a bilayer planar geometry is considered. The key outcomes are the critical role of thermo-elastic properties and the thickness of the structures. The approach is then used to evaluate the propensity for unstable cracking of a range of crown structures, including substructures of a range of ceramics, and to show that two specific combinations are most prone to this behaviour, namely porcelain fused to glass ceramics and zirconia substrates. In addition, a simple approach for the minimization of the likelihood for such behaviour and chipping is proposed.

Keywords
Porcelain chipping; Dental crowns; Residual stresses
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Unstable cracking (chipping) of veneering porcelain on all-ceramic dental crowns and fixed partial dentures
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Publisher
Database: Elsevier - ScienceDirect
Journal: Acta Biomaterialia - Volume 5, Issue 5, June 2009, Pages 1668–1677
Authors
,
Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us