Figure 4: A diagram of a canal with a ledge in the outer curve, showing how the tip of a pre-curved file may enter the ledge. | British Dental Journal

Figure 4: A diagram of a canal with a ledge in the outer curve, showing how the tip of a pre-curved file may enter the ledge.

From: Endodontic problems

Figure 4

If the file is rotated through 180° the curved tip will follow the original canal.

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