overjet

With an overjet, the upper front teeth angle outwards (horizontal).

Its purpose is to slow or stop the upper jaw from growing, hence preventing or correcting an overjet.

When the reverse is the case, and the lower jaw extends forward beyond the upper, the condition is referred to as retrognathia (reverse overjet).

An anterior cross bite can not be referred as negative overjet, and is typical of class III skeletal relations (prognathism).

Overbite is often confused with overjet, which is the distance between the maxillary anterior teeth and the mandibular anterior teeth in the anterior-posterior axis.

Class II: Distocclusion (retrognathism, overjet) In this situation, the upper molars are placed not in the mesiobuccal groove but anteriorly to it.

When there is maxillary and/or alveolar prognathism which causes an alignment of the maxillary incisors significantly anterior to the lower teeth, the condition is called an overjet.

They have an underdeveloped upper jaw, relatively protruding lower jaw with anterior mandibular vertical excess and a Class III Skeletal and Dental (reverse overjet) profile.

The opposite can also happen, where the maxilla grows too large or too far forward and/or the mandible has less than normal growth resulting in "overjet" and often "over bite" (class 2 occlusion).

In severe cases of mandibular overgrowth or maxillary under growth the tooth alignment gets out of whack and the mandibular incisors protrude in front of the maxillary incisors (negative overjet, class 3 occlusion).

Cases in which the Pre-Eruption Guidance process would be beneficial include improvement of dental alignment and correction of a functional occlusion (severe deep bite, severe overjet, constricted maxillary width, blocked out maxillary cuspids, lower crowding).

The most favorable morphologic factors for serial extraction include class 1 malocclusion, a favorable morphogenetic pattern - one that does not change, a flush terminal plane or a mesial step relationship of the primary second molars, minimum overjet and minimum overbite.