Successful individualized endodontic treatment of severely curved root canals in a mandibular second molar: A case report

Figure 1 Initial clinical situation (#37). A: Photograph of the mandibular second molar; B: Preoperative periapical radiograph of the molar; C: Measurement of the radius of the curvature and angles; D and E: Sagittal (D) and coronal (E) dimensions obtained from cone beam computed tomography (CBCT); F-H: Axial dimensions obtained from CBCT; I: Three-dimensional reconstruction of CBCT images presenting the perforation of the lingual cortical plate. White and yellow arrows represent the mesial root canals and a distal root canal, respectively; orange arrows show the regions of large periapical radiolucency.

Figure 2 Treatment of the mandibular second molar. A: Severe curvature of the file in the canal apex; B: Preoperative image; C: Postoperative image of the bottom medullary chamber; D: Radiograph for working length determination; E: Final radiograph after the operation; F: Follow-up at 2 wk; G: The tooth after crown preparation; H: Ceramic crown; I: Occlusal surface after restoration.

Figure 3 Post-treatment situation of the mandibular second molar and follow-ups. A: Occlusive situation of the left molars; B and C: Three-month (B) and one-year (C) radiographic follow-up images demonstrating healing of the periapical lesion; D-H: Cone beam computed tomography (CBCT) images at 1-year radiographic follow-up; I: Three-dimensional reconstruction of CBCT images presenting healing of the lingual cortical plate. White and yellow arrows represent the mesial root canals and a distal root canal, respectively; orange arrows show the regions of periapical healing.