**4. Donor sites in oral and maxillofacial surgery**

Various donor sites to harvest free bone grafts are used in oral and maxillofacial surgeries. Each site has its own indications, advantages and disadvantages. Ideally, the surgeons prefer to harvest bone from a site that is close to the recipient site to operate in one surgical site and avoid making more skin scars. In reality, the quality and quantity of bone sometimes neces‐ sitates grafting from other sites.
