What examination finding would indicate a Le Fort I fracture?

A Le Fort I fracture is characterized by a horizontal fracture of the maxilla that typically involves the upper dental arch and extends through the maxillary sinuses. The defining feature of this type of fracture is the mobility of the upper dental arch, which results from the separation of the maxilla from the rest of the facial skeleton.

The mobility of the upper dental arch occurs because the fracture line runs above the teeth, allowing the entire maxillary area to become dislodged or have abnormal movement when palpated. This finding is a classic indicator of a Le Fort I fracture, as it highlights the separation of the maxilla from the surrounding structures, leading to instability in this region.

In contrast, other findings such as severe pain or swelling over the zygomatic arch may suggest facial injuries but are not specific to Le Fort I fractures. Difficulty breathing could indicate more extensive facial injuries or airway compromise, rather than being a direct sign of a Le Fort I fracture. Therefore, mobile upper dental arch is the most relevant examination finding associated with this specific type of fracture.