Figure 1: (a) Preoperative cone-beam computed tomography, (b) preoperative radiograph, (c) working length determination, (d) master cone, (e) obturation radiograph, (f) schematic diagram of surgical template, (g) fabrication surgical template using computer-aided design, (h) postoperative radiograph, (i) after 3-month follow-up, (j) after 6-month follow-up