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Journal of Dental Research
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Fracture Mechanics Parameters for Failure Prediction of Composite Resins

R. De Groot

Department of Cariology and Endodontology, School of Dentistry, University of Nijmegen, PO Box 9101, 6500 HB Nijmegen, The Netherlands

H.C. Van Elst

Faculty of Materials Science, Delft University of Technology, PO Box 5025, 2600 GA Delft, The Netherlands

M.C.R.B. Peters

Department of Cariology and Endodontology, School of Dentistry, University of Nijmegen, PO Box 9101, 6500 HB Nijmegen, The Netherlands

This study contains the first part of a research project in which the applicability of fracture mechanics parameters to predict failure of a restored tooth was investigated. Fracture mechanics parameters have been used in dental research before, but were restricted to comparative studies between various brands of composites. The critical values of the opening mode stress intensity factor (KI), its equivalents, the strain energy release rate (GI), and the J integral (J I), were measured with single-edge notched-bend (SENB) specimens of dental composite in a three-point bend test. The measured values of K Ic for Silux (KIc = 0.99 ± 0.03 MNm-3/2) and P-30 (KIc = 1.88 ± 0.12 MNm-3/2), compared with values from the literature, show quantitative agreement. The J integral was computed by means of finite element analysis (FEA) on a two-dimensional model of the SENB specimens.

The critical value of the J integral (measured with SENB specimens, notch depth-to-width ratio (a/W) = 1/2) was used to predict failure of specimens having an arbitrary geometry. In this study, failure was predicted for SENB specimens with notch depth-to-width ratio (a/W) = 1/4 and 3/4. The predicted deflection and load at failure correspond well with the measured deflection and load.

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Journal of Dental Research, Vol. 67, No. 6, 919-924 (1988)
DOI: 10.1177/00220345880670060601
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This Article
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What's this?