Overjet

Overjet is a term used in orthodontics to describe the horizontal overlap of the incisors. It is often confused with overbite, which refers to the vertical overlap of the teeth. Overjet is measured in millimeters and is typically assessed using a periodontal probe during a dental examination.

Definition

Overjet is defined as the extent of horizontal (anterior-posterior) overlap of the maxillary central incisors over the mandibular central incisors. In a normal dental arrangement, the upper incisors should slightly overlap the lower incisors horizontally. An increased overjet can be a sign of several dental and skeletal abnormalities, such as malocclusion or prognathism.

Causes

Overjet can be caused by a variety of factors, including genetic predisposition, habits such as thumb sucking, and skeletal discrepancies between the upper and lower jaw. It can also be a result of the loss of posterior teeth, which can cause the anterior teeth to protrude forward.

Treatment

The treatment for overjet often involves orthodontic intervention. This can include the use of braces, Invisalign, or other orthodontic appliances to move the teeth into the correct position. In severe cases, orthognathic surgery may be required to correct the skeletal discrepancies causing the overjet.

See also

• Overbite
• Malocclusion
• Orthodontics
• Dental braces