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A comparison of the parameters quantifying the fracture behavior of enamel for crack growth in the longitudinal (Long.) and transverse (Trans.) directions. Responses for the transverse direction have been divided into two groups corresponding to the outermost enamel (O; D ≤ 30%) and the innermost enamel (I; D ≥ 70%). (a) The initiation toughness (K0); (b) the growth toughness (Kg); and (c) the maximum crack growth resistance (i.e. the fracture toughness, Kc).
