[en] OBJECTIVES: The residual stress profile developed within the veneering ceramic during the manufacturing process is an important predicting factor in chipping failures, which constitute a well-known problem with yttria-tetragonal-zirconia polycrystal (Y-TZP) based restorations. The objectives of this study are to measure and to compare the residual stress profile in the veneering ceramic layered on three different polycrystalline ceramic framework materials: Y-TZP, alumina polycrystal (AL) and zirconia toughened alumina (ZTA). METHODS: The stress profile was measured with the hole-drilling method in bilayered disk samples of 19mm diameter with a 0.7mm thick Y-TZP, AL or ZTA framework and a 1.5mm thick layer of the corresponding veneering ceramic. RESULTS: The AL samples exhibited increasing compressive stresses with depth, while compressive stresses switching into interior tensile stresses were measured in Y-TZP samples. ZTA samples exhibited compressive stress at the ceramic surface, decreasing with depth up to 0.6mm from the surface, and then becoming compressive again near the framework. SIGNIFICANCE: Y-TZP samples exhibited a less favorable stress profile than those of AL and ZTA samples. Results support the hypothesis of the occurrence of structural changes within the Y-TZP surface in contact with the veneering ceramic to explain the presence of tensile stresses. Even if the presence of Y-TZP in the alumina matrix seems to negatively affect the residual stress profiles in ZTA samples in comparison with AL samples, the registered profiles remain positive in terms of veneer fracture resistance.
Research center :
d‐BRU - Dental Biomaterials Research Unit - ULiège [BE]
Disciplines :
Materials science & engineering Dentistry & oral medicine
Author, co-author :
Fukushima, K. A.
Sadoun, M. J.
Cesar, P. F.
MAINJOT, Amélie ; Centre Hospitalier Universitaire de Liège - CHU > Institut de dentisterie - prothèse fixée
Language :
English
Title :
Residual stress profiles in veneering ceramic on Y-TZP, alumina and ZTA frameworks: Measurement by hole-drilling
Publication date :
February 2014
Journal title :
Dental Materials
ISSN :
0109-5641
eISSN :
1879-0097
Publisher :
Elsevier, Netherlands
Volume :
30
Issue :
2
Pages :
105-111
Peer reviewed :
Peer Reviewed verified by ORBi
Commentary :
Copyright (c) 2013 Academy of Dental Materials. Published by Elsevier Ltd. All rights reserved.
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