Mandibular fracture after third molar removal.

PURPOSE Mandibular fracture after impacted lower third molar removal is a rare, but major, complication. The factors leading to a mandibular fracture secondary to third molar removal are analyzed retrospectively. PATIENTS AND METHODS Six patients who suffered from a mandibular fracture as a complication after third molar removal were examined clinically and radiographically. RESULTS All fractures occurred an average of 14 days postoperatively. The patients were 42 to 50 years old and were all fully dentulous. All grades of tooth impaction were included. CONCLUSIONS The major risk factor for this complication seems to be advanced age in combination with a full dentition. The degree of tooth impaction is less important. Preexisting bone lesions weaken the mandible and further predispose to a fracture.