PMC9984825_01
Periapical radiographs of tooth #20; A) The initial radiograph reveals carious disto-occlusal lesion and atypical canal configuration of tooth #20; B) First working length radiograph suggests that there is another canal which is located mesially; C) Unsuccessful attempt to find the third canal; D) The third canal has been found, and the working length is confirmed; E) Master cones confirmation radiograph; F) Post-operative radiograph
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F1
Pre-operative radiography showed a disto-occlusal carious lesion in tooth #20 with atypical root canal configuration and widening of the periodontal ligament (Figure 1A). A #8 C-Pilot file (VDW, Munich, Germany) was used to find the third canal in mesiobuccal direction, and working length radiography was taken again (Figures 1B to 1D). Master cones confirmation radiography was taken (Figure 1E). A radiograph was taken to evaluate the quality of obturation (Figure 1F) and the patient was referred to an operative dentist for a coronal restoration.
Periapical radiograph of tooth #20 at the second appointment (after six months)
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F2