Explain ledge bypass - non-surgical endodontic retreatment, Biology

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Explain Ledge bypass - Non-surgical Endodontic Retreatment

Ledge bypass - StSt not NiT cause it has shape memory

Ledges from outside the curvatures.
The file tip is slowly scraped along the internal wall of the canal curve slightly coronal to the level of the ledge.
Looking for another sticky spot that indicate the entrance to the apical canal segment.
Gentle reciprocal rotation allow the file to negotiated to the canal terminus.
Confirm with a radiograph.
Short-amplitude push/pull and rotational forces.(not more than 1 mm )
Anti-curvature filing to blend the ledge.

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