"Underbite" is a lay term indicating an anterior cross bite, lower incisors in front of upper incisors, or upper incisors behind lower incisors. Cause may be dental malposition, skeletal malrelationship, or both. This is a serious malocclusion requiring the services of a
Malocclusion of the teeth is a misalignment problem that can lead to serious oral health complications. It’s also known as: crowded teeth; crossbite; overbite; underbite; open bite; The teeth won’t be able to perform vital functions if they’re misaligned.
Overjet is the extent of horizontal (anterior-posterior) overlap of the maxillary central incisors over the mandibular central incisors. In class II (division I) malocclusion the overjet is increased as the maxillary central incisors are protruded.
Class 2 malocclusion is diagnosed when a severe overbite is present. This condition, known as retrognathism (or retrognathia), means that the upper teeth and jaw significantly overlap the lower jaw and teeth. Class 3. Class 3 malocclusion is also diagnosed when there’s a severe underbite.