Residual stress profiles in veneering ceramic on Y-TZP, alumina and ZTA frameworks: measurement by hole-drilling.
OBJECTIVE
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 19 mm diameter with a 0.7 mm 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.


CONCLUSIONS
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.
Department of Biomaterials and Oral Biology, School of Dentistry, University of São Paulo, Brazil.
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KA
Fukushima
Unité de Recherches Biomatériaux Innovants et Interfaces (URB2I-EA4462), Université Paris Descartes, Sorbonne Paris Cité, Faculté de Chirurgie Dentaire, Paris, France.
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MJ
Sadoun
Department of Biomaterials and Oral Biology, School of Dentistry, University of São Paulo, Brazil.
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PF
Cesar
Unité de Recherches Biomatériaux Innovants et Interfaces (URB2I-EA4462), Université Paris Descartes, Sorbonne Paris Cité, Faculté de Chirurgie Dentaire, Paris, France; Department of Fixed Prosthodontics, Institute of Dentistry, University of Liège Hospital (ULg, CHU, LIMARC), 45 Quai G. Kurth, Liège 4020, Belgium. Electronic address: a.mainjot@chu.ulg.ac.be.
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Mainjot
D000537:Aluminum Oxide / Q000737:chemistry*; D002516:Ceramics; D003801:Dental Veneers; D008855:Microscopy, Electron, Scanning; D013314:Stress, Mechanical; D015019:Yttrium / Q000737:chemistry*; D015040:Zirconium / Q000737:chemistry*
C499362:yttria stabilized tetragonal zirconia; D015019:Yttrium; D015040:Zirconium; D000537:Aluminum Oxide
Alumina; Chipping; Hole-drilling; Residual stress; Veneering ceramic; Zirconia; Zirconia toughened alumina