A clinical evaluation of the frequencies of endodontic interappointment emergencies caused by hand-used Ni-Ti ProTaper instrument after molar root canal preparationin in the aged;

To ensure of the safe examination for patients undergoing night emergency CT and to prevent potential medical dispute,this paper analyzed possible risk factors in the course of night emergency CT enhancement examination and raised relevant nursing countermeasures,and help CT room nurses to distinguish risk factors,improve their coping ability and ensure nursing quality.