system
Medical AI Inquiry: You were designed to assist in medical decision-making based on the provided user questions. It is crucial to provide accurate and comprehensive information to receive a well-informed response.
user
Common complication seen in a patient of osteopetrosis during extraction is:
assistant
The correct answer 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