In orthodontics, what does the term "overjet" refer to?

The term "overjet" specifically refers to the horizontal distance between the upper and lower incisors when the teeth are in occlusion. It measures how far the upper incisors protrude over the lower incisors in a straight line. This measurement is important in orthodontics because it helps in evaluating a patient's bite and alignment of their teeth. A normal overjet allows for proper function and aesthetics, while an excess or deficiency can indicate malocclusion and may require orthodontic treatment.

The other options describe different dental measurements or conditions. The vertical overlap of incisors relates to the overbite, which refers to how much the upper teeth cover the lower teeth vertically. The angle of jaw alignment pertains more to different classification systems like Angle's Classification, which assesses dental occlusion based on the relationship between the molars. The depth of bite indicates how deep the upper incisors overlap the lower ones, which again relates to overbite rather than overjet. Understanding these distinctions is crucial for accurate diagnosis and treatment planning in orthodontics.