What does “Overjet” mean?
Overjet is the front-to-back distance between the upper and lower front teeth, also called horizontal overlap.
How far away is it horizontally?
Overjet expresses how far the upper front teeth sit ahead of the lower front teeth. Overbite describes how much they overlap vertically. When the upper front teeth bite behind the lower front teeth, the reversed relationship can be described as reverse overjet.
Conditions to look at with numbers
The inclination of the front teeth, jawbone relationship, whether the lips close comfortably, and the risk of trauma are also evaluated. Even if the distance is the same, the causes of the teeth and jaw may be different. Measurements alone do not determine whether a tooth should be extracted or have surgery.
Information specifying treatment goals
Distinguish between the range in which the front-to-back distance can be adjusted by tooth movement and the need for growth and skeletal treatment. It is useful in describing the relationship of the front teeth before and after orthodontic treatment, but the bite and gum conditions of the entire dentition must also be considered.
Frequently Asked Questions
Does a large overjet always mean Class II malocclusion?
The horizontal distance of the front teeth and the anterior-posterior classification of the entire dentition may be related, but they are not the same information. Check the molar relationship and jaw/teeth position.
How does overjet differ from a deep bite?
Overjet is the front-to-back distance, while a deep bite is excessive vertical overlap of the front teeth. Both can occur together.
Questions needed to understand Overjet
Learn what the term means and how it relates to your dental condition.
- Sufficient understanding
How do overjet and overbite differ?
Explanation and evidenceCheck the overjet and overbite separately to explain the relationship between the front teeth.
NHS England Orthodontic Assessment and Referral - A choice suited to your condition
What about tooth tilt and overall occlusion?
Explanation and evidenceRather than determining the cause based on distance alone, the scope of treatment is determined based on examination and diagnosis data.
American Association of Orthodontists · Glossary of Orthodontic Terms
