Microtensile Bond Strength and Impact Energy of Fracture of CAD-Veneered Zirconia Restorations

Purpose: With state‐of‐the‐art CAD/CAM technology, the fabrication of large and complex zirconia frameworks is just a click away. On the other hand, veneering of the frameworks is still operator‐dependent. The aim of this work was to evaluate CAD veneering of zirconia restorations in terms of zircon...

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Bibliographic Details
Published in:Journal of prosthodontics 2009-04, Vol.18 (3), p.211-216
Main Authors: Aboushelib, Moustafa N., De Kler, Marcel, Van Der Zel, Jef M., Feilzer, Albert J.
Format: Article
Language:English
Subjects:
CAD veneering
Computer-Aided Design
Crowns
Dental Bonding
Dental Materials - chemistry
Dental Occlusion, Centric
Dental Prosthesis Design
Dental Restoration Failure
Dental Stress Analysis - instrumentation
Dental Veneers
Dentistry
Humans
impact energy of fracture
Materials Testing
Microscopy, Electron, Scanning
Molar
MTBS
press-on ceramic
Stress, Mechanical
Surface Properties
Technology, Dental
Tensile Strength
zirconia
Zirconium - chemistry
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Summary:Purpose: With state‐of‐the‐art CAD/CAM technology, the fabrication of large and complex zirconia frameworks is just a click away. On the other hand, veneering of the frameworks is still operator‐dependent. The aim of this work was to evaluate CAD veneering of zirconia restorations in terms of zirconia veneer bond strength and impact energy of fracture in a step towards complete automation of the fabrication process. Materials and Methods: A new CAD/CAM system was used to fabricate a resin replica of the esthetic ceramic required to veneer a zirconia framework. The replica was seated on the zirconia framework and further processed using press‐on technology. The bond strength between zirconia and the CAD veneer was evaluated using microtensile bond strength test. The impact energy of fracture of the specimens was also investigated. Manually layered zirconia specimens served as a control (α= 0.05). Results: There was no significant difference in the microtensile bond strength between zirconia and either of the used veneers (39 MPa). Even though the impact energy of fracture of the CAD‐veneered and manually layered specimens was almost identical (0.13 J), the former demonstrated a cohesive fracture of the veneer, while the latter failed by delamination of the veneer ceramic. Conclusion: CAD veneering is a reliable method for veneering zirconia restorations.
ISSN:1059-941X
1532-849X
DOI:10.1111/j.1532-849X.2008.00412.x