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A split tooth (tooth 25). (a1, a2, a3) Axial image showing a mesiodistal hair-like hypodense line (arrow) that is present on the crown but gradually disappears on the root. (a4) Coronal reconstruction images showing a fracture line extend from the occlusal surface to the pulp cavity (arrows). (b1, b2, b3, b4) A fracture line could be found from occlusal surface to the 2/3 root (arrows).
