What type of fracture is indicated by a casualty complaining that their teeth do "not fit together"?

When a casualty reports that their teeth do not fit together properly, it typically indicates a fracture involving the mandible. The mandible, or jawbone, plays a critical role in dental alignment; therefore, a fracture in this area can cause misalignment of the teeth and result in the sensation that they do not fit together.

Fractures in other areas like the mid-face or nasal region can lead to structural changes or deformities, but they would not directly impact the alignment of the teeth to the extent seen with mandibular fractures. A basilar skull fracture primarily affects the base of the skull and is not associated with dental occlusion issues. Thus, the specific complaint of misaligned teeth strongly points to a fracture of the mandible as the most plausible cause.