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Fracture resistance of yttrium oxide partially-stabilized zirconia all-ceramic bridges after veneering and mechanical fatigue testing
Umeå University, Faculty of Medicine, Department of Odontology.
Umeå University, Faculty of Medicine, Department of Odontology, Prosthetic Dentistry.
Umeå University, Faculty of Medicine, Department of Odontology, Dental Materials Science.
2005 (English)In: Dental Materials, ISSN 0109-5641, E-ISSN 1879-0097, Vol. 21, no 5, 476-482 p.Article in journal (Refereed) Published
Abstract [en]

OBJECTIVES: Yttria-stabilized zirconia (Y-TZP) ceramic is a high-performance material with excellent mechanical properties suitable for fixed partial dentures. The purpose of this study was to evaluate after fatigue testing, the effect of heat-treatment and veneering on the fracture resistance of frameworks manufactured using sintered and subsequently hot isostatic pressed yttrium oxide partially-stabilized zirconia (Denzir).

METHODS: The specimens were subjected to dynamic loading in water. Thereafter, using a universal testing machine, the fracture resistance of three-unit fixed partial dentures was determined; (i) of the frameworks as delivered after machining, (ii) after the frameworks had been subjected to heat-treatment similar to veneering with a glass-ceramic (Eris) or a feldspar-based ceramic (Vita D) and (iii) after the frameworks had been veneered with these ceramics. In addition, the fracture resistance of frameworks as delivered after machining not subjected to dynamic loading in water was determined.

RESULTS: Cyclic loading in water did not significantly (p>0.05) affect the fracture resistance. The load necessary to fracture the frameworks as delivered after machining was significantly (p<0.001) higher than for the heat-treated and veneered specimens. No significant difference was seen between the specimens veneered with Eris and those veneered with Vita D (p>0.05). For all but three specimens the fractures were located in the loading point and through one of the connectors.

SIGNIFICANCE: Heat-treatment and veneering reduce fracture resistance of hot isostatic pressed zirconia. Nevertheless, the results obtained indicate that it is an interesting material for potential in all-ceramic restorations.

Place, publisher, year, edition, pages
2005. Vol. 21, no 5, 476-482 p.
Keyword [en]
All-ceramic bridges; Dental ceramics; FPDs; Fracture load; Y-TZP
National Category
Biomaterials Science
Identifiers
URN: urn:nbn:se:umu:diva-15844DOI: 10.1016/j.dental.2004.07.013PubMedID: 15826705OAI: oai:DiVA.org:umu-15844DiVA: diva2:155516
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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Publisher's full textPubMedhttp://linkinghub.elsevier.com/retrieve/pii/S0109-5641(04)00152-6

Authority records BETA

Sundh, AndersMolin, MargaretaSjögren, Göran

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