Allusive separated instrument

Patient presented in a dental office complaining of pain on the lower left jaw when biting. A referral identified 4.6 as the source of pain. He decided to remove the crown and the infiltrated composite reconstruction underneath, finding a soft root canal obturation so he decided to refer the case to my practice. After clinical tests, I confirmed that tooth 4.6 was the cause of a localized symptomatic apical periodontitis with previously obturated root canals (according to the new diagnosis classification of AAE and ESE). The radiographic interpretation reflected an apparent insufficient obturation on all root canals and a more radiopaque aspect on one of the mesial canals. The patient agreed to have a root canal retreatment. After isolation, the…