Ledge formation during negotiation/shaping
What it is
Creating an iatrogenic "step" or deviation from the original canal path so that the working length can no longer be negotiated and the canal's original pathway is lost.
Why it happens
• Inadequate access / no straight-line entry → files deflect and dig into the outer wall of a curve • Forcing small stainless-steel files (especially in curved/narrow canals) instead of letting them follow the canal • No glide path before using rotary NiTi shaping files → increases risk of procedural errors including ledge/zip formation • No chelation/lubrication + debris packing (dentin mud) → canal blocks, then file tips deviate • Skipping patency/recapitulation → debris accumulation and loss of negotiability (often precedes ledging)
The full clinical mistake entry includes
- How to avoid it — the prevention protocol
- The clinical tip experienced clinicians use
- The documented reference behind the mistake
More clinical mistakes
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