Dental Materials
Volume 24, Issue 5 , Pages 611-617, May 2008

A study of the bending resistance of implant-supported reinforced alumina and machined zirconia abutments and copies

  • Anders Sundh

      Affiliations

    • Dental Materials Science, Faculty of Medicine, Umeå University, 901 87 Umeå, Sweden
    • D.D.S. National Dental Health Service, County Council of Västerbotten, Norsjö, Sweden and Manager of Research and Development, Cad.esthetics AB, Skellefteå, Sweden
    • ,
  • Göran Sjögren

      Affiliations

    • Dental Materials Science, Faculty of Medicine, Umeå University, 901 87 Umeå, Sweden
    • Corresponding Author InformationCorresponding author. Tel.: +46 90 785 61 32; fax: +46 90 77 56 17.

Received 30 August 2006; accepted 31 May 2007.

Abstract 

Objectives

The purpose of the present study was to evaluate the bending resistance of implant-supported CAD/CAM-processed restorations made out of zirconia or manually shaped made out of reinforced alumina.

Methods

Units of abutments and copies made of (i) a prefabricated hot isostatic pressed (HIPed) yttrium oxide partially-stabilized zirconia (Y-TZP) (Denzir), (ii) a prefabricated densely-sintered magnesia partially stabilized zirconia (Mg-PSZ) (Denzir-M) or, copies made of (iii) a prefabricated partially-sintered, porous reinforced alumina ceramic (RN synOcta-In-Ceram) were subjected to static loading perpendicularly at the long axis. The abutments were attached to either stainless steel analogs or titanium implant fixtures. The Y-TZP and Mg-PSZ copies were bonded onto the ceramic abutments with a dual-cured resin composite (Rely-X Unicem). Units of titanium abutment attached to a titanium implant fixtures were used as reference.

Results

The units comprising Denzir abutments as delivered (p<0.05) and heat-treated Denzir copies bonded to the Denzir abutments as delivered (p<0.01) and attached to stainless steel analogs exhibited significantly higher bending resistance than the control. The heat-treated Denzir copies bonded to the heat-treated Denzir M abutments attached to titanium implant fixtures and the In-Ceram specimens attached to stainless steel analogs showed significantly (p<0.05) lower bending resistance than the heat-treated Denzir copies bonded to the Denzir abutments as delivered and attached to stainless steel analogs. No statistically significant (p>0.05) differences were seen among the other groups studied.

Significance

All the ceramic abutments and copies exhibited values that were equal or superior to that of the control and exceeded the reported value, up to 300 N, for maximum incisal bite forces. To assess the clinical behavior long-term clinical studies should be conducted.

Keywords: CAD/CAM, Dental ceramics, Dental implants, Mg-PSZ, Titanium, Y-TZP

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PII: S0109-5641(07)00162-5

doi:10.1016/j.dental.2007.05.021

Dental Materials
Volume 24, Issue 5 , Pages 611-617, May 2008

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