Objective:Evaluate subcritical crack growth(SCG)of IPS-Empress2 layers structures.Method:Barshaped specimens of IPS-Empress2 layers structures(n=30) were fabricated and loaded in three-point bending(3p) and cyclic fatigued.The initialσ and the number of cycles to fracture were obtained from(3p)and F tests,respectively.Data was examined using Weibull statistics.Use the empirical law of paris to analysize the SCG,the behavior of which was described in terms of crack velocity as a function of stress intensity ...