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Fracture-mechanics Parameters of the Composite-Enamel Bond

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, 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

In a previous study, the critical values of the opening mode stress intensity factor (K₁ ), its equivalent, the strain energy-release rate (G₁), and the J integral (J₁) (in the elastic case being equal to that of G₁) were determined for resin composite.

In this study, the strength of the composite-tooth interface was investigated. The critical values of K₁ and J₁ were measured with single-edge notched-bend (SENB) specimens of resin composite bonded to enamel, with the notch at midspan at the bonded interface. Due to enamel's anisotropy, the values of K_1c and J_1c to be used in a fracture-mechanics application for failure prediction of a structure depend on the enamel prism orientation relative to the adhesive interface. Where interfacial failure is to be expected, the following values for J _1c and K_1c can be used: Silux, J_1c = 145 ± 35 Jm^-2 and K_1c = 0.84 ± 0.16 MNm^-3/2; P-30, J_1c = 163 ± 13 Jm^-2 and K_1c = 1.02 ± 0.07 MNm^-3/2. Where enamel failure is expected or where the failure mode cannot be predicted, the following values can be applied: Silux, J _1c = 89 ± 15 Jm^-2 and K_1c = 0.84 ± 0.16 MNm^-3/2; P-30, J_1c = 89 ± 15 Jm^-2 and K _1c = 0.75 ± 0.10 MNm^-3/2.

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Journal of Dental Research, Vol. 69, No. 1, 31-35 (1990)
DOI: 10.1177/00220345900690010401


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