H-File Root Canal File (Hedström)
Hedström-type root canal file that cuts on the pull stroke; used for planing canal walls and removing old root filling material.
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Description
The H-file, or Hedström file, is an endodontic hand instrument machined by grinding helical flutes into a tapered round blank. Its cutting edges face backwards, so the file cuts only on the pull stroke — which makes it noticeably faster at removing dentine than a K-file. Its main uses are planing the canal wall, flaring the canal orifice and removing old root filling material. The instruments are sized to the ISO colour-coded numbering system, and the handle colour lets the operator pick a size quickly during treatment. Because the cutting flutes reduce the core diameter, an H-file is more fragile than a K-file of the same size: it should not be rotated within the canal and must not be forced, particularly in curved canals. Every file should be inspected before use and any instrument with unwound flutes or a bend discarded. Copious irrigation during instrumentation prevents dentine debris packing between the flutes and binding the file.
Specifications
| Product type | Hedström (H) type root canal file |
|---|---|
| Manufacturing | Machined by grinding helical flutes into a tapered round blank |
| Cutting direction | Cuts on the pull stroke only |
| Cutting efficiency | Removes dentine more aggressively than a K-file |
| Applications | Planing canal walls, flaring the canal orifice, removing old root filling material |
| Sizing | Sized to the ISO colour-coded numbering system |
| Handle | Colour-coded plastic finger handle |
| Caution | Prone to fracture if rotated; use with care in curved canals |
| Service life | Discard any file that is distorted or has unwound flutes |
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