Overjet
Pronunciation: OH-ver-jet
The horizontal distance between the labial surface of the upper central incisors and the labial surface of the lower central incisors, measured in millimetres.
Full Definition
Overjet (sometimes called 'horizontal overlap') quantifies the anterior-posterior relationship of the upper and lower incisor edges and is a key measurement in orthodontic records and medico-legal dental reports. A normal overjet is approximately 2–4 mm; increased overjet is associated with Class II malocclusion and carries a heightened risk of dental trauma. Editors must distinguish 'overjet' from 'overbite' (the vertical overlap) — these two terms are frequently confused in non-specialist writing. Both should be reported with a numeric value and unit (mm).
Usage
Usage note: Always distinguish from 'overbite'; provide a numeric value in millimetres when editing clinical records.
In Context
- "Pre-treatment records documented an overjet of 9 mm, necessitating fixed appliance therapy." — Orthodontic case record
- "The medico-legal report noted a traumatic injury predisposed by the patient's increased overjet." — Medico-legal dental report