What is the term for the horizontal distance between the upper and lower incisors?

The term for the horizontal distance between the upper and lower incisors is overjet. Overjet refers specifically to the measurement of how far the upper incisors project horizontally over the lower incisors when the teeth are in a occluded position. This relationship is crucial in orthodontics and dentistry because it can affect bite function and aesthetics. A normal overjet measurement contributes to proper jaw alignment and can indicate appropriate dental occlusion.

In contrast, overbite describes the vertical overlap of the upper incisors over the lower incisors, while interdental space refers to the spaces between individual teeth. Arch circumference is a measurement related to the overall length of the dental arch but does not specifically refer to the distance between incisors. Thus, overjet correctly captures the concept of horizontal distance between the upper and lower incisors.