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.