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 Concept

# Screw-In Effect (Taper Lock)

## Definition

The tendency of a rotating file to be drawn apically into the canal as its flutes engage dentine along a length of the wall. It is associated with positive rake angles, greater taper and a wider area of engagement, and it raises torsional load, which is why crown-down sequencing, light apical pressure and a short pecking motion are commonly used to limit it.

## Related Terms

[Glide Path](https://endo-guide.app/glossary/glide-path)[Working Length](https://endo-guide.app/glossary/working-length)[Apex Locator](https://endo-guide.app/glossary/apex-locator)[Crown-Down Technique](https://endo-guide.app/glossary/crown-down-technique)[Canal Transportation](https://endo-guide.app/glossary/canal-transportation)[Debris Extrusion](https://endo-guide.app/glossary/debris-extrusion)

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