PMC9108828_01
Preoperative radiograph and clinical photographs
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F1
Radiographic examination revealed the presence of a fractured instrument in the apical one-third of the distal canal (Fig. 1A). The primary mandibular second molar was isolated with the rubber dam (Fig. 1B). The separated instrument was visualized with the help of a dental operating microscope (DOM) (HS-Moller-Wedel International, Germany) at 8x magnification (Fig. 1C).
Intraoperative radiographs and clinical photographs showing retrieved instrument
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F2
France) by placing and activating it alongside the instrument circumferentially at a power setting of 4 under the DOM at 16x magnification. Following staging, using the same tip at a power setting of 5, the ultrasonic tip was placed in contact with the instrument and activated moving it gently in a counterclockwise direction, which led to the loosening of file fragment and popping out into the pulp chamber (Fig. 2C). The radiographic assessment confirmed the complete retrieval of the fractured fragment (Figs. 2A and B). The fractured instrument was found to be a K-file, approximately 4 mm in length (Fig. 2D).
Postoperative and follow-up radiographs
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F3
The obturation was carried out with Metapex, calcium hydroxide paste with iodoform (Meta Biomed, Korea), by injecting into each canal gradually until they were filled (Fig. 3A). Type IX Glass Ionomer cement (GC Corporation, Tokyo Japan). The tooth was further prepared and restored with a preformed SS crown (Hu-Friedy, IL, USA) (Fig. 3B). The patient was recalled again after 2 weeks, 3 months, and 6 months intervals (Figs. 3C and D).