Figure 2: Case  1: (a1)–(a3) determination of the location of calcified root canal orifice: (a1) calcified orifices (red arrows); (a2) root canals under calcification (red arrows); (a3) and distance between the calcified orifice and orifices of other canals (red lines). (b1)–(b3) Determination of depth in buccolingual direction and BLIA. (c1)–(c3) Determination of depth in mesiodistal direction and MDIA. (d) Affirmation of working length. (e) Canals after filling and temporary restoration.