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Fracture resistance of all-ceramic zirconia bridges with differing phase stabilizers and quality of sintering
Umeå University, Faculty of Medicine, Department of Odontology, Dental Materials Science.
Umeå University, Faculty of Medicine, Department of Odontology, Dental Materials Science.
2006 (English)In: Dental Materials, ISSN 0109-5641, E-ISSN 1879-0097, Vol. 22, no 8, 778-784 p.Article in journal (Refereed) Published
Abstract [en]

OBJECTIVES: The mechanical properties of zirconia ceramics are affected of stabilizing oxides and quality of sintering. The purpose of this study was to investigate the fracture resistance of frameworks manufactured using prefabricated zirconia blanks with differing stabilizing oxides and quality of sintering.

METHODS: After dynamic loading in water, the fracture resistance was determined of stylized three-unit fixed partial dentures made of prefabricated homogenous ceramic green-body yttria-stabilized zirconia (Y-TZP) blanks (Vita YZ) or of densely-sintered magnesia partially stabilized zirconia (Mg-PSZ) blanks (Denzir-M); (i) as supplied from the manufacturer, (ii) after subjection to heat treatment in a way similar to veneering, and (Hi) after veneering with a feldspar-based ceramic.

RESULTS: After veneering, the load at fracture of the Vita YZ specimens was significantly higher (p<0.05) than that of Denzir-M. The load necessary to fracture Denzir-M as supplied after machining was significantly (p<0.05) higher than that of heat-treated Denzir-M, Vita YZ as supplied and heat-treated Vita YZ specimens. There was no significant difference (p>0.05) between the heat-treated and veneered Denzir-M specimens. For Vita YZ the load at fracture of the veneered specimens was significantly (p<0.05) higher than of those as supplied or heat-treated, whereas no significant difference (p>0.05) was seen between heat-treated Vita YZ and Vita YZ specimens as supplied.

SIGNIFICANCE: The fracture strength of the Vita YZ specimens increased considerably after veneering. Denzir-M and Vita YZ seem to be interesting alternatives for use as core materials in all-ceramic restorations. Long-term studies are, however, necessary before general clinical recommendations can be issued.

Place, publisher, year, edition, pages
2006. Vol. 22, no 8, 778-784 p.
Keyword [en]
CAD/CAM; Dental ceramics; FPDs; Fracture load; Mg–PSZ; PSZ; TZP; Vita In-Ceram 2000 YZ; Y-TZP
National Category
Biomaterials Science
Identifiers
URN: urn:nbn:se:umu:diva-16176DOI: 10.1016/j.dental.2005.11.006PubMedID: 16414111OAI: oai:DiVA.org:umu-16176DiVA: diva2:155849
Available from: 2008-02-26 Created: 2008-02-26 Last updated: 2010-11-12Bibliographically 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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Sundh, AndersSjögren, Göran

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