Fracture-mechanics Parameters of the Composite-Enamel Bond

Abstract

In a previous study, the critical values of the opening mode stress intensity factor (K ₁ ), its equivalent, the strain energy-release rate (G ₁ ), and the J integral (J ₁ ) (in the elastic case being equal to that of G ₁ ) were determined for resin composite.

In this study, the strength of the composite-tooth interface was investigated. The critical values of K ₁ and J ₁ 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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