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What is the defect if the metal chips clog between the teeth of file?
1. File bit
2. Glazing of file
3. Pinning of file
4. Wrapping of file

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Correct Answer - Option 3 : Pinning of file

Explanation:

  • During filing, sometimes the metal chips (filings) will clog between the teeth of files. This is known as ‘pinning’ of files.
  • Files which are pinned will produce scratches on the surface being filed, and also will not bite well.
  • Pinning of the files is removed by using a file brush also called a file card, with either forward or backward stroke.

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