PMC7757944_01
a-e. Reconstructed image showing the area of interest (a) Preoperative CBCT image [sagittal] (b) Preoperative CBCT image [axial section - coronal] (c) Preoperative CBCT image [axial section - middle] (d) Preoperative CBCT image [axial section - apical] (e)
EEJ-2-5-g001.jpg
PMC7757944_01_EEJ-2-5-g001.jpg
F1
CBCT (field of view 5 x 8 cm, Voxel size 125 um, Veraviewepocs R100, J Morita, Osaka, Japan) was performed. CBCT axial images showed that canals encased in the mesial and distal roots were narrow, especially in the middle and apical thirds of the roots (Figure 1).
a-h. A photograph showing the 3 orifices of the mesial canals (a) A photograph showing the 3 orifices of the distal canals (b) Confirmation periapical radiograph for the master GP (c) Postoperative CBCT scan (coronal and sagittal sections - mesial root) (d) Postoperative CBCT scan (coronal and sagittal sections - distal root) (e) Postoperative CBCT image [axial section - coronal] (f) Postoperative CBCT image [axial section - middle] (g) Postoperative CBCT image [axial section - apical] (h)
EEJ-2-5-g002.jpg
PMC7757944_01_EEJ-2-5-g002.jpg
F2
Troughing through the isthmus between the MB and ML revealed a third middle mesial (MM) canal (Figure 2a). Careful inspection revealed a shadow of a third canal in the distal root (middle distal [MD] canal) (Figure 2b). This was reconfirmed during master gutta-percha cone placements (Figure 2c). Limited field of view postoperative CBCT was performed to confirm proper three-dimensional (3D) obturation of the canals, especially that the six separate canals and foramina may not be clearly identified using periapical radiographs due to the potential overlap of images with mesial and distal shifts (Figure 2d-h).