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Late fractures of the mandible after operative removal of the lower molars are relatively rare. As a result of the increased observation of this rare fracture-which is complication after osteotomy - the typical clinical development is described. Common among the four patients referred to the author from January 1997 to June 1997 were: an audible click upon biting on a hard substance, persistent pains at the site of operation, and renewed local swelling. Age (> 40 years) and extensive osteotomy were the main causes of the late fractures. Preventive measures include thorough enlightenment of the patient about the possibility of a late fracture as one of the complications of the operation. Consequently also the information about the type of food to be taken 5-6 weeks after surgery. Very important too are limitation of bone loss during osteotomy and prophylactic intermaxillary fixation after surgery.