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3 2012, 0 - : 0-0 Back to browse issues page
.Influence of veneer thickness on residual stress profile in veneering ceramic: Measurement by hole-drilling
Amélie K. Mainjot * , Gary S. Schajer , Alain J. Vanheusden , Michaël J. Sadoun
Abstract:   (2820 Views)
Objectives

 The veneering process of frameworks induces residual stresses and can initiate cracks when combined with functional stresses. The stress distribution within the veneering ceramic as a function of depth is a key factor influencing failure by chipping. This is a well-known problem with Yttria-tetragonal-zirconia-polycrystal based fixed partial dentures. The objective of this study is to investigate the influence of veneer thickness on the stress profile in zirconia- and metal-based structures.

Methods

 The hole-drilling method, often used for engineering measurements, was adapted for use with veneering ceramic. The stress profile was measured in bilayered disc samples of 20AWT IMAGEmm diameter, with a 1AWT IMAGEmm thick zirconia or metal framework. Different veneering ceramic thicknesses were performed: 1AWT IMAGEmm, 1.5AWT IMAGEmm, 2AWT IMAGEmm, 2.5AWT IMAGEmm and 3AWT IMAGEmm.

Results

 All samples exhibited the same type of stress vs. depth profile, starting with compressive at the ceramic surface, decreasing with depth up to 0.5–1.0AWT IMAGEmm from the surface, and then becoming compressive again near the framework, except for the 1.5AWT IMAGEmm-veneered zirconia samples which exhibited interior tensile stresses. Stresses in the surface of metal samples were not influenced by veneer thickness. Variation of interior stresses at 1.2AWT IMAGEmm from the surface in function of veneer thickness was inverted for metal and zirconia samples.

Significance

 Veneer thickness influences in an opposite way the residual stress profile in metal- and in zirconia-based structures. A three-step approach and the hypothesis of the crystalline transformation are discussed to explain the less favorable residual stress development in zirconia samples.


  Source: Dental Materials

  Full text

Keywords: Residual stress, Hole-drilling, Zirconia, Veneering ceramic, Thickness
     
Type of Study: Research | Subject: Cosmetic and Restorative Dentistry
Received: 2012/02/9 | Accepted: 2015/12/16 | Published: 2015/12/16
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K. Mainjot A, S. Schajer G, J. Vanheusden A, J. Sadoun M. .Influence of veneer thickness on residual stress profile in veneering ceramic: Measurement by hole-drilling. 3 2012;
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جامعه اسلامی دندانپزشکان Islamic Dental Association of IRAN

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