PMC6875349_01
(a) Preoperative clinical feature. (b) Preoperative radiograph with a broken file in the mesiolingual canal. (c) Broken file was seen inside the canal (dental microscope magnification). (d) Ensuring the position of the file with an instrument.
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Radiographic examination showed radiolucent images in the bifurcation area and apical mesial and distal roots and a broken file from the orifice to the middle of the mesiolingual root (Figures 1(a) and 1(b)).
(a) Endodontic micro forceps. (b) Broken file was successfully retrieved.
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Switzerland). Since the direct application of ultrasonic devices does not have the ability required to remove the file, endodontic micro forceps (Broken Instrument Removal Kit, Zumax, China) were used including a screw wedge that works by clamping the file fragments through a mechanical lock and pulling them to the coronal (Figure 2(a)). After the file fragment has been successfully lifted (Figure 2(b)), it was confirmed with a photo of the radiograph.
One-month postoperative evaluation: (a) postoperative radiograph; (b) Ceramage  onlay for restoration.
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Two weeks after onlay preparation, onlay was cemented using resin cement (Figure 3(b)).