Fracture resistance of all-ceramic crowns placed on a preparation with a slice-formed finishing line

  1. J. ÅKESSON1,
  2. A. SUNDH2,3,
  3. G. SJÖGREN4

Article first published online: 31 MAY 2009

DOI: 10.1111/j.1365-2842.2009.01962.x

Issue

Journal of Oral Rehabilitation

Journal of Oral Rehabilitation

Volume 36, Issue 7, pages 516–523, July 2009

Additional Information

How to Cite

ÅKESSON, J., SUNDH, A. and SJÖGREN, G. (2009), Fracture resistance of all-ceramic crowns placed on a preparation with a slice-formed finishing line. Journal of Oral Rehabilitation, 36: 516–523. doi: 10.1111/j.1365-2842.2009.01962.x

Author Information

  1. 1

    National Dental Health Service, County Council of Västerbotten, Vindeln, Sweden

  2. 2

    National Dental Health Service, County Council of Västerbotten, Norsjö, Sweden

  3. 3

    Cad.esthetics AB, Skellefteå, Sweden

  4. 4

    Dental Materials Science, Faculty of Medicine, Umeå University, Umeå, Sweden

*Dr Göran Sjögren, Dental Materials Science, Faculty of Medicine, Umeå University, SE-901 87 Umeå, Sweden. E-mail: goran.sjogren@odont.umu.se

Publication History

  1. Issue published online: 10 JUN 2009
  2. Article first published online: 31 MAY 2009
  3. Accepted for publication 29 April 2009

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Keywords:

  • all-ceramic crowns;
  • CAD/CAM;
  • dental ceramics;
  • densely-sintered magnesia partially stabilized zirconia;
  • zirconia;
  • yttrium-oxide partially stabilized zirconia

Summary  The purpose of this study was to determine the fracture resistance of all-ceramic crowns with a core of a zirconia ceramic, using various stabilizing oxides and luted on a preparation with a slice-formed finishing line. Ten cores made of HIPed yttrium-oxide partially stabilized zirconia (HIPed Y-TZP) and five cores of densely-sintered magnesia partially stabilized zirconia (Mg-PSZ) were made. The Mg-PSZ cores and five of the HIPed Y-TZP cores were made with a thickness of 0·2 mm. A further five cores 0·1-mm thick were made of HIPed Y-TZP. All 15 cores were then veneered with a feldspar ceramic and luted onto a stylized steel master die model with a slice-formed finishing line. The specimens were then loaded until fracture occurred. The HIPed Y-TZP specimens with the 0·2 mm core exhibited significantly higher fracture resistance than the Mg-PSZ specimens (P = 0·004) and the HIPed Y-TZP specimens with the 0·1 mm core (P = 0·001). The fracture resistance of the Mg-PSZ specimens was significantly (P = 0·015) higher than that of the HIPed Y-TZP specimens with the 0·1 mm core. The fracture resistance determined was equal or superior to reported values for bite forces and all-ceramic crowns. Thus, it seems likely that the type of restorations evaluated have the potential for successful use on a slice-formed preparation. However, long-term studies are essential in order to assess the performance of this ceramic system in a clinical context.

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