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Flexural Strength Measurement of Ceramic Dental Restorative Materials

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Abstract:

Flexural strength of a dental material reflects its ability to withstand tensile stresses and thus the fracture risk of a filling. The flexural strength of an experimental bioceramic Calcium aluminate-based (CA) dental restorative material was measured using three different methods with a composite (Tetric Ceram), a glass ionomer cement (Fuji II) and a phosphate cement (Harward) as references. The three test methods were: a) ISO 4049 for dental composites, 3-point bend test b) EN 843-1 for ceramic materials, 3-point bend test and c) ASTM F-394, biaxial ball-on-disc for ceramic materials. The strength of the CA-material, tested in the ball-on-disc method, is close to the theoretical strength based on the microstructure of the material (max. grain size of 15 μm). The composite material and the phosphate cement were rather insensitive to the test method, while the glass ionomer cement as the CA-material showed sensitivity towards the test method. A modified biaxial test method for evaluation of strength of dental materials in a close to real-life component is proposed.

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Periodical:

Key Engineering Materials (Volumes 361-363)

Pages:

873-876

DOI:

https://doi.org/10.4028/www.scientific.net/KEM.361-363.873

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Online since:

November 2007

Authors:

Leif Hermansson, Lars Kraft, Karin Lindqvist, Nils Otto Ahnfelt, Hakan Engqvist

Keywords:

Calcium Aluminate, Dental Restorative Materials, Flexural Strength, Test Method

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© 2008 Trans Tech Publications Ltd. All Rights Reserved

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