The influence of support properties and complexity on fracture strength and fracture mode of all-ceramic fixed dental prostheses.

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The influence of support properties and complexity on fracture strength and fracture mode of all-ceramic fixed dental prostheses.

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Publication Article, peer reviewed scientific
Title The influence of support properties and complexity on fracture strength and fracture mode of all-ceramic fixed dental prostheses.
Author(s) Mahmood Jallal Hadi, Deyar ; Linderoth, Ewa ; Vult Von Steyern, Per
Date 2011
English abstract
Objective: When a new material is released, clinical studies are indicated. For the clinical studies to be defensible, in-vitro studies, as clinically relevant as possible, must be performed. The aim of the present study was to investigate how the choice of material used for supporting tooth analogues and support complexity influence test results concerning the fracture strength of FDPs made of a brittle material Y-TZP. Material and methods: Twenty-four FDPs were produced in Y-TZP. The FDP cores were subjected to heat treatment to simulate veneering and then thermocycled for 5,000 cycles to simulate ageing. The FDPs were divided into 3 groups and were cemented on tooth-supporting analogues made from aluminium, polymer and DuraLay®. The FDPs were preloaded for 10,000 cycles and finally loaded to fracture. Results: There were no significant differences in load-to- fracture and fracture mode between the groups cemented on polymer and DuraLay® tooth analogues. The FDPs cemented on aluminium tooth analogues showed a significantly higher load at fracture and a different fracture mode. Conclusions: Within the limitations of this in-vitro study the following could be concluded: to achieve mutually comparable results there is a need for a standardised, simple test set-up for in-vitro testing of all-ceramic FDPs intended for cementation upon natural teeth. Resilient, non-complex and resilient complex tooth analogues give comparable test results when the test set-up is unchanged in all other aspects. Non-resilient (with an e-modulus of aluminium or higher) tooth analogues give high and unrealistic load-at-fracture values together with adverse fracture modes compared to FDPs failing in clinical situations.
DOI http://dx.doi.org/10.3109/00016357.2010.549508 (link to publisher's fulltext)
Publisher Taylor & Francis
Host/Issue Acta Odontologica Scandinavica;4
Volume 69
ISSN 1502-3850
Pages 229-37
Language eng (iso)
Subject(s) Y-TZP
All-ceramic
Dental porcelain
Fixed Dental Prostheses
Y-TZP
Medicine
Research Subject Categories::ODONTOLOGY
Handle http://hdl.handle.net/2043/13195 (link to this page)

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