Retrieval Broken Instrument Through Existing Crown From Root Canal Treated Mandibular First Molar: A Case Report

Abstract

A common complication during root canal cleaning and shaping is instrument breakage within the canal, which can compromise the success of treatment. Retrieval of the broken instrument is an important step to allow for complete cleaning and shaping of the root canal. This process must be done under a dental operating microscope in conjunction with staging of a platform by ultrasonic.       Additional instruments may be required to hold the broken instrument, as a microtube, such as an IRS        system to facilitate removal of the broken instrument without causing excessive root canal dentine loss. This case study presents a 51-year-old female patient who presented a sinus tract opening near her   lower left first molar. Tooth 36 had an intact crown margin. Periapical radiographs showed a 4 x 4 mm periapical lesion. A nonsurgical root canal retreatment was planned through the existing crown to       explore missed distolingual root canal and retrieval the broken instrument in the mesiobuccal root     canal. After retreatment, this tooth was restored with a resin composite. At 3 months follow-up, the  results were satisfactory. The patient was asymptomatic and radiographic examination showed resolution of the periapical lesion.