Factors associated with external root resorption

 # Following are the factors associated with external root resorption except:
A. Grafting of alveolar clefts
B. Cysts
C. Orthodontic therapy
D. Endodontic therapy

The correct answer is A. Graft of alveolar clefts.

Risk factors associated with severe resorption are:
- Shorter than average roots.
- Previously traumatized teeth.
- Nonvital teeth.
- Teeth subjected to excessive forces.
- Combination of orthodontic and orthognathic procedures.

Reference: Shafer’s Textbook of ORAL PATHOLOGY, 7th Edition, Page No: 930

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