Crossbite

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Overview

Crossbite is an occlusal irregular condition where a lower tooth has a more buccal position than the antagonist upper tooth. Crossbite can involve a single tooth or a group of teeth. Crossbite can be classified as anterior or posterior.

Anterior crossbite can also be referred as negative overjet, and is typical of class III skeletal relations (Progenism).
Posterior crossbite is often correlated to a narrow maxilla and upper dental arch. A posterior cross-bite can be unilateral or bilateral.

Unilateral cross-bite often determines a lateral shift of the mandibular position, which can become structural if left untreated for a long time during growth, leading to skeletal asymmetries.

Classification

Buccal Crossbite

Buccal crossbite is due to the buccal displacement of the affected tooth or teeth as it relates to the antagonistic tooth or teeth in the posterior segments of the arch.

Lingual Crossbite

Lingual crossbite is due to the lingual displacement of the mandibular affected tooth or teeth as it relates to the antagonistic tooth or teeth.

Palatal Crossbite

Palatal crossbite is due to the palatal displacement of the maxillary affected tooth or teeth as it relates to the antagonistic tooth or teeth.

Complete Mandibular Buccal Crossbite

Complete mandibular buccal crossbite is present when all the mandibular teeth are lingually positioned to the maxillary teeth due to a narrower mandibular arch than the maxillary arch.

Complete Maxillary Palatal Crossbite

Complete maxillary palatal crossbite is present when all the maxillary teeth are palatal to the mandibular arch due to the narrower maxillary arch.

Both complete mandibular buccal crossbite and complete maxillary palatal crossbite could be referred as scissors bite.

Complete Crossbite

Complete crossbite is found when all teeth in one arch are positioned either inside or outside to the all teeth in the opposing arch.

Scissors-bite

is present when one or more of the adjacent posterior teeth are either positioned completely buccally or lingually to the antagonistic teeth and exhibit a vertical overlap.