Fractures of the mandible are the second most common facial fractures seen in the ED, after nasal fractures. In one large series they accounted for 45% of all facial fractures. Interpersonal violence is the most frequent cause of mandibular fractures with falls and road traffic accidents as the other common causes (1).

Dislocation of the temporomandibular joint (TMJ) is an infrequent presentation to the ED(2). Approximately 90% of all cases are bilateral and anterior. The most common cause found in one survey was excessive mouth opening whilst yawning(3).

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