Post-normal occlusion is characterized by an increased overjet, which occurs when the upper anterior teeth extend significantly beyond the lower anterior teeth horizontally. This feature reflects a discrepancy in anteroposterior jaw relationships, often resulting from skeletal or dental factors. Unlike decreased overjet or crossbite, increased overjet is a defining characteristic in post-normal occlusion, indicating an imbalance that affects occlusal function and aesthetics. Proper diagnosis is essential for planning effective treatment in orthodontics or orthognathic surgery.

Reference: Wheeler's Dental Anatomy, Physiology and Occlusion, 10th Edition.