Classification of the third molar in relation to inferior alveolar nerve (IAN).

The various types of location of 3^rd molar root to inferior alveolar nerve canal

1. Darkening of roots
2. Deflection of roots
3. Narrowing of roots
4. Dark and bifid apex of roots
5. Interruption of white line of canal
6. Diversion of canal
7. Narrowing of canal

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