Which characteristic indicates a skeletal anterior crossbite?

A skeletal anterior crossbite is a condition where the relationship between the maxilla (upper jaw) and mandible (lower jaw) is such that the lower teeth are positioned more forward than the upper teeth when in occlusion. This positioning is often a result of the underlying skeletal structure rather than just dental misalignment.

The characteristic traits indicating a skeletal anterior crossbite often include a prominent chin, which can occur due to a Class III skeletal relationship where the mandible is positioned more anteriorly compared to the maxilla. Observing a flat mandibular plane can further indicate skeletal issues, as it may reflect the relationship and positioning of the jaw bones. An underdeveloped maxillary arch contributes to the crossbite condition by failing to provide adequate width to accommodate normal dental occlusion, further placing the lower teeth ahead of the upper ones.

Thus, all these characteristics—prominent chin, flat mandibular plane, and underdeveloped maxillary arch—are interrelated and emphasize the skeletal origins of the anterior crossbite. A combination of these factors helps practitioners assess and diagnose the condition correctly, making the inclusion of all mentioned features pertinent in recognizing a skeletal anterior crossbite.