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A study of the bending resistance of implant-supported reinforced alumina and machined zirconia abutments and copies
Umeå University, Faculty of Medicine, Department of Odontology, Dental Materials Science.
Umeå University, Faculty of Medicine, Department of Odontology, Dental Materials Science.
2008 (English)In: Dental Materials, ISSN 0109-5641, E-ISSN 1879-0097, Vol. 24, no 5, 611-617 p.Article in journal (Refereed) Published
Abstract [en]

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.

Place, publisher, year, edition, pages
2008. Vol. 24, no 5, 611-617 p.
Keyword [en]
CAD/CAM, Dental ceramics, Dental implants, Mg-PSZ, Titanium, Y-TZP
National Category
Dentistry
Identifiers
URN: urn:nbn:se:umu:diva-16922DOI: 10.1016/j.dental.2007.05.021PubMedID: 17681595OAI: oai:DiVA.org:umu-16922DiVA: diva2:156595
Available from: 2008-03-21 Created: 2008-03-21 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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