Common complication seen in a patient of osteopetrosis during extraction is:
Medullary spaces of jaws are remarkably reduced in both forms.
Osteomyelitis and jaw fracture is common during tooth extraction.

Key concept:
Osteomyelitis of the mandible is common due to a deficient blood supply. Bones are fragile and can fracture easily. 
Ref: Shafer's textbook of oral pathology 7th edition page 704
Jaw fracture
Osteomyelitis
Both of the above
None