Figure 4From: Interpreting finite element results for brittle materials in endodontic restorations Failure lines for different criteria and location of critical points for DTT and FT. Failure lines for the different failure criteria in a planar stress condition (σ 2 = 0) in a plot of maximum principal stress σ 1 against minimum principal stress σ 3 , for a hypothetical brittle material with TS = 100 MPa and CS = 300 MPa, together with the location of the critical points for DTT and FT with the different failure criteria.Back to article page