Article (Scientific journals)
Influence of zirconia framework thickness on residual stress profile in veneering ceramic: Measurement by hole-drilling.
MAINJOT, Amélie; Schajer, G. S.; Vanheusden, Alain et al.
2012In Dental Materials, 28 (4), p. 378-384
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Abstract :
[en] OBJECTIVES: Framework design is reported to influence chipping in zirconia-based restorations, which is an important cause of failure of such restorations. Residual stress profile in the veneering ceramic after the manufacturing process is an important predictive factor of the mechanical behavior of the material. The objective of this study is to investigate the influence of framework thickness on the stress profile measured in zirconia-based structures. METHODS: The stress profile was measured with the hole-drilling method in bilayered disc samples of 20mm diameter with a 1.5mm thick veneering ceramic layer. Six different framework thicknesses from 0.5mm to 3mm were studied. Two different cooling procedures were also investigated. RESULTS: Compressive stresses were observed in the surface, and tensile stresses in the depth of most of the samples. The slow cooling procedure was found to promote the development of interior tensile stresses, except for the sample with a 3mm thick framework. With the tempering procedure, samples with a 1.5mm thick framework exhibited the most favorable stress profile, while thicker and thinner frameworks exhibited respectively in surface or interior tensile stresses. Significance: The measurements performed highlight the importance of framework thickness, which determine the nature of stresses and can explain clinical failures encountered, especially with thin frameworks. The adequate ratio between veneering ceramic and zirconia is hard to define, restricting the range of indications of zirconia-based restorations until a better understanding of such a delicate veneering process is achieved.
Disciplines :
Dentistry & oral medicine
Author, co-author :
MAINJOT, Amélie  ;  Centre Hospitalier Universitaire de Liège - CHU > Institut de dentisterie - prothèse fixée
Schajer, G. S.
Vanheusden, Alain ;  Université de Liège - ULiège > Département de science dentaire > Prothèse dentaire fixe - Anatomie bucco-dentaire
Sadoun, M. J.
Language :
English
Title :
Influence of zirconia framework thickness on residual stress profile in veneering ceramic: Measurement by hole-drilling.
Publication date :
2012
Journal title :
Dental Materials
ISSN :
0109-5641
eISSN :
1879-0097
Publisher :
Elsevier Science, Kidlington, United Kingdom
Volume :
28
Issue :
4
Pages :
378-384
Peer reviewed :
Peer Reviewed verified by ORBi
Commentary :
Copyright (c) 2011 Academy of Dental Materials. Published by Elsevier Ltd. All rights reserved.
Available on ORBi :
since 23 January 2012

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