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Brittleness index of machinable dental materials and its relation to the marginal chipping factor

Tsitrou, E.A., Northeast, S.E. and van Noort, R. (2007) Brittleness index of machinable dental materials and its relation to the marginal chipping factor. Journal of Dentistry, 35 (12). pp. 897-902. ISSN 0300-5712

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OBJECTIVES: The machinability of a material can be measured with the calculation of its brittleness index (BI). It is possible that different materials with different BI could produce restorations with varied marginal integrity. The degree of marginal chipping of a milled restoration can be estimated by the calculation of the marginal chipping factor (CF). The aim of this study is to investigate any possible correlation between the BI of machinable dental materials and the CF of the final restorations.

METHODS: The CERECTM system was used to mill a wide range of materials used with that system; namely the Paradigm MZ100TM (3M/ESPE), Vita Mark II (VITA), ProCAD (Ivoclar-Vivadent) and IPS e.max CAD (Ivoclar-Vivadent). A Vickers hardness Tester was used for the calculation of BI, while for the calculation of CF the percentage of marginal chipping of crowns prepared with bevelled marginal angulations was estimated.

RESULTS: The results of this study showed that Paradigm MZ100 had the lowest BI and CF, while IPS e.max CAD demonstrated the highest BI and CF. Vita Mark II and ProCAD had similar BI and CF and were lying between the above materials. Statistical analysis of the results showed that there is a perfect positive correlation between BI and CF for all the materials.

CONCLUSIONS: The BI and CF could be both regarded as indicators of a material’s machinability. Within the limitations of this study it was shown that as the BI increases so does the potential for marginal chipping, indicating that the BI of a material can be used as a predictor of the CF.

Item Type: Article
Copyright, Publisher and Additional Information: © 2007 Elsevier B.V. This is an author produced version of a paper published in Journal of Dentistry. Uploaded in accordance with the publisher's self archiving policy.
Institution: The University of Sheffield
Academic Units: The University of Sheffield > Faculty of Medicine, Dentistry and Health (Sheffield) > School of Dentistry (Sheffield) > Department of Adult Dental Care (Sheffield)
Depositing User: Sherpa Assistant
Date Deposited: 02 Oct 2008 11:51
Last Modified: 08 Feb 2013 16:56
Published Version: http://dx.doi.org/10.1016/j.jdent.2007.07.002
Status: Published
Publisher: Elsevier B.V.
Identification Number: 10.1016/j.jdent.2007.07.002
URI: http://eprints.whiterose.ac.uk/id/eprint/4722

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