Ledge
An iatrogenic shelf of dentine created on the canal wall when an instrument deviates from the original canal path, obstructing further instrumentation.
Full Definition
A ledge is a procedural complication in root canal treatment in which the instrument tip gouges into the dentinal wall rather than following the natural canal curvature, producing an artificial step or shelf. Once formed, a ledge can prevent files from reaching the working length and may result in incomplete debridement. In clinical manuscripts, 'ledge' should not be used as a verb ('to ledge the canal') without editorial flagging, as some style guides prefer the nominal construction 'ledge formation.' Editors should also watch for incorrect synonyms such as 'step' or 'shelf,' which lack clinical precision.
Usage
Usage note: Prefer the noun form 'ledge formation' over the verb 'to ledge.' Do not substitute 'step' or 'shelf,' which are imprecise in this context.
In Context
- "Ledge formation was avoided by pre-curving the hand file before insertion into the curved canal." — Clinical technique article
- "The radiograph revealed a ledge at the apical third, necessitating bypass instrumentation." — Retreatment case report