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A broken jaw (or mandible fracture) is a common facial injury. Only the nose is broken more frequently. A broken jaw is the 10th most common fractured bone in the human body. Fractures (breaks in the bone) are generally the result of a direct force or trauma to the jawbone (mandible). A dislocated jawbone means that the temporomandibular joint (where the jaw connects with the skull) is moved out of place.
The mandible is a U-shaped bone. It is the only mobile bone of the facial skeleton, and, since it houses the lower teeth, its motion is essential for mastication. It is formed by intramembranous ossification. The mandible is composed of 2 hemimandibles joined at the midline by a vertical symphysis.nterior surface. In the midline of the anterior surface of the maxilla is found a prominence, called the anterior nasal spine, with a lateral concave rim, called the nasal notch, that forms the floor of the piriform aperture.