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A comparison of fracture strength of yttrium-oxide-partially-stabilized zirconia ceramic crowns with varying core thickness, shapes and veneer ceramics
Umeå University, Faculty of Medicine, Department of Odontology, Dental Materials Science.
Umeå University, Faculty of Medicine, Department of Odontology, Dental Materials Science.
2004 (English)In: Journal of Oral Rehabilitation, ISSN 0305-182X, E-ISSN 1365-2842, Vol. 31, no 7, 682-688 p.Article in journal (Refereed) Published
Abstract [en]

The fracture strengths of stylized all-ceramic crowns manufactured using an yttrium-oxide-partially-stabilized (Y-TZP) zirconia ceramic core (Denzir) veneered with lithium disilicate glass-ceramics (IPS Empress 2 or IPS Eris) were evaluated. The Denzir cores were manufactured in two ways: either with different thicknesses in different parts of the restoration, called an ‘adapted Denzir core’; or with a uniform core thickness of 0.5 mm. IPS Empress 2 all-ceramic crowns served as reference. There was no significant difference between the crowns with an ‘adapted Denzir core’ veneered with the two brands of glass-ceramics. No significant difference was seen between the crowns with a 0.5 mm Denzir core veneered with the two brands of glass-ceramics. The crowns with an ’adapted Denzir core’ exhibited significantly higher values than those with a 0.5 mm Denzir core and than the IPS Empress 2 crowns used as reference. No significant differences were seen among the IPS Empress 2 crowns used as reference and the crowns with a 0.5 mm Denzir core. The mode of failure varied among the Empress 2 crowns and the crowns with a core of a Y-TZP zirconia ceramic. Long-term studies are necessary to assess the clinical performance of this restorative system.

Place, publisher, year, edition, pages
2004. Vol. 31, no 7, 682-688 p.
Keyword [en]
All-ceramic crowns, CAD/CAM, Dental ceramics, Glass-ceramics, Fracture strength, Y-TZP, Zirconia
National Category
Dentistry
Identifiers
URN: urn:nbn:se:umu:diva-6431DOI: 10.1111/j.1365-2842.2004.01284.xPubMedID: 15210030OAI: oai:DiVA.org:umu-6431DiVA: diva2:146100
Available from: 2007-12-13 Created: 2007-12-13 Last updated: 2017-12-14Bibliographically approved
In thesis
1. Zirconia as a biomaterial for odontological applications: effects of composition and manufacturing processes on fracture resistance
Open this publication in new window or tab >>Zirconia as a biomaterial for odontological applications: effects of composition and manufacturing processes on fracture resistance
2010 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Background: Ceramics have long been amongst the most biocompatible materials known but their mechanical properties have limited their use. During the past few decades zirconia has aroused particular interest as a biomaterial because of its greater flexural strength, fracture resistance and toughness compared to other bioceramics. Technological inventions and developments have made the processing of zirconia-based ceramics possible and thus also the successful processing of dental restorations constructed from this type of material. The properties of zirconia-based ceramics can, however, be affected by, for example, shape, composition, manufacturing processes and subsequent handling. It was, therefore, of particular interest to study in what way recently introduced zirconia-based ceramics intended for odontological applications could be affected by the shape, manufacturing process, composition, grinding and veneering.

Methods: By means of newly invented and developed CAM-Software systems with improvements in grinding technology and strategy and hardware technology, cores for single crowns, fixed partial denture (FPD) frameworks and implant-supported abutments and copies were manufactured from a hot isostatic-pressed (HIPed) yttria-stabilized tetragonal zirconia polycrystal (Y-TZP) ceramic. In addition, zirconia-based ceramics intended for odontological applications but made from other compositions and/or using different manufacturing techniques were studied. The effects were determined of shape, composition, manufacturing process, heat treatment and veneering of the cores/frameworks on the fracture or bending resistance of various types of ceramic single crowns, FPD frameworks and implant-supported abutments and copies.

Results: Different thicknesses in different parts of HIPed Y-TZP cores improved the fracture resistance compared with cores of a uniform thickness resulting in a thicker veneer layer. Machining, heat treatment and veneering affected the fracture resistance of the zirconia-based ceramics studied. In addition, the quality of sintering and composition and type of veneering porcelain used influenced the fracture resistance of zirconia-based ceramics.

Conclusion: The results obtained indicate that zirconia-based ceramics have the potential for use as a material in odontological applications. The mechanical properties of zirconia ceramics are, however, affected by, among other things, the shape, composition, manufacturing processes and subsequent handling of the material. These findings have to be taken in consideration in the production processes of zirconia-based ceramic restorations. To further improve their function more studies are needed to elucidate the effects of various manufacturing and handling techniques on the properties of zirconia-based ceramics.

Place, publisher, year, edition, pages
Umeå: Umeå universitet, 2010. 50 p.
Series
Umeå University odontological dissertations, ISSN 0345-7532 ; 114
Keyword
CAD/CAM, ceramics, HIPing, Mg-PSZ, veneering, Y-TZP, zirconia
Identifiers
urn:nbn:se:umu:diva-37578 (URN)978-91-7459-073-9 (ISBN)
Public defence
2010-12-03, Sal B By1D, Norrlands universitetssjukhus, Umeå, 09:00 (Swedish)
Opponent
Supervisors
Available from: 2010-11-12 Created: 2010-11-09 Last updated: 2010-11-15Bibliographically approved

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