Terminology and Classification
Crossbite can involve a single tooth or a group of teeth. It can be classified in anterior or posterior and bilateral or unilateral.
An anterior cross bite can not be referred as negative overjet, and is typical of class III skeletal relations (prognathism).
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.
Posterior crossbite is also known as "reverse articulation".
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