Female, age 51
Cracked root of tooth 26 after failed endodontic treatment
Four walls around the tooth roots
9mm in the vertical dimension and 6mm in the horizontal dimension
A tooth with non-restorable crown destruction, dead pulp, failed or unfeasible endodontic treatment, chamber floor perforation, root fracture, or external root resorption
Root separation, tooth root removal, curettage of the lesion