Ultrasonic inserts for removing root posts, calcifications and fractured inserts. ER1 - exposure of root canal pins ER2 - location of concealed or calcified root canal entrances, removal of restoration materials, calcification and fractured inserts in the coronal third of the root canal ER3 - presentation of calcified root canals entrances, removal of root elements and fractured inserts in the coronal third of the root canal ER4 - presentation of calcified root canals entrances, removal of root elements and fractured inserts in the coronal third of the root canal ER5 - removal of fractured inserts in the medial and apical third of the root canal