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Anterior open bite resulted from tongue thrusting in a 24 y.o. patient. Anterior upper teeth are not touching their counterpart. Anterior open bite (AOB) is defined as a condition in which there is no contact and no vertical overlap of the lower incisor crown with the upper incisor crown when the mandible is in full occlusion. [19]
An open bite malocclusion is when the upper teeth don't overlap the lower teeth. When this malocclusion occurs at the front teeth it is known as anterior open bite. An open bite is difficult to treat due to multifactorial causes, with relapse being a major concern. This is particularly so for an anterior open bite. [58]
The bite can be characteristically open on that side. Bilateral thrust: [citation needed] This occurs when the tongue pushes between the back teeth on both sides during the swallow with the jaw partially open. Sometimes, the only teeth that touch are the molars, with the bite completely open on both sides including the anterior teeth.
In children, tongue thrusting is common due to immature oral behavior, narrow dental arch, prolonged upper respiratory tract infections, spaces between the teeth (diastema), muscle weakness, malocclusion, abnormal sucking habits, and open mouth posture due to structural abnormalities of genetic origin.
The use of intra-oral adhesive pads as part of oral myology therapy is a new technique to induce and assist in tongue exercise. One study suggests the use of adhesive pads was efficient in treatment of anterior open bite malocclusion and thumb sucking in children. [5] [non-primary source needed]
In instances when the maxillary anterior teeth are lingual to the mandibular teeth, the condition is referred to as an anterior crossbite. In some cases, this arrangement of teeth may indicate a displacement of the mandible relative to the maxilla and is called Class III or Pseudo-Class III malocclusion. Normal occlusion is Class I occlusion.
3.c Anterior or posterior crossbites with >1mm but ≤2mm discrepancy between the retruded contact position and intercuspal position 3.d Displacement of teeth >2mm but ≤4mm 3.e Lateral or anterior open bite >2mm but ≤4mm 3.f Increased and incomplete overbite without gingival or palatal trauma Grade 2 (little treatment need)
Upper Airway Obstruction where people with "adenoid faces" who have trouble breathing through their nose. They have an open bite malocclusion and present with development of posterior crossbite. [12] Prolong digit or suckling habits which can lead to constriction of maxilla posteriorly [13] Prolong pacifier use (beyond age 4) [13]